Technical Manual Ribbed belT dRives

Transcription

oPTibelT
in
cl
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a d
n in
d g
bu P
sh ul
es ley
s
Technical Manual
Ribbed belT dRives
Technical Manual
Ribbed Belt Drives
This manual contains all relevant technical information as well as the method for calculating drives with
optibelt RB ribbed belts and RBS ribbed belt pulleys
for mechanical engineering. The OPTIBELT range
for ribbed belt drives is based on the standards
ISO 9982, RMA/MPTA IP-26 and DIN 7867.
Our applications engineers would be pleased to give
advice about using these drive systems and will work
together with you to solve your drive problems. This
service is of course free of charge.
It is especially important for large-scale series to take
advantage of this service which will find the best
possible solution for your requirements using state-ofthe-art computer programs.
© Arntz OPTIBELT Group, Germany 1
oPTibelT woRldwide
europe
canada
usa
Mexico
africa
brazil
2
© Arntz OPtIBELt GrOuP, GErmAny
www.optibelt.com
china
india
Thailand
The Philippines
vietnam
singapore
indonesia
australia
OPTIBELT GmbH
www.optibelt.de
OPTIBELT ÖSTERREICH GmbH
www.optibelt.at
OPTIBELT (UK) LTD.
www.optibelt.co.uk
OPTIBELT POLSKA SP. Z O.O.
www.optibelt.pl
OPTIBELT NEDERLAND B.V.
www.optibelt.nl
OOO “OPTIBELT
POWER TRANSMISSION”
www.optibelt.ru
OPTIBELT FINLAND OY
www.optibelt.fi
OPTIBELT HUNGARY KFT.
www.optibelt.hu
OPTIBELT SKANDINAVISKA AB
www.optibelt.se
OPTIBELT CORPORATION
www.optibelt.us
SALES DENMARK
www.optibelt.dk
OPTIBELT (CANADA) INC.
www.optibelt.ca
SALES NORWAY
www.optibelt.no
OPTIBELT DO BRASIL LTDA.
www.optibelt-br.com
OPTIBELT FRANCE SAS
www.optibelt.fr
OPTIBELT ASIA PACIFIC PTE. LTD.
www.optibelt.sg
OPTIBELT AG
www.optibelt.ch
OPTIBELT POWER TRANSMISSION
www.optibelt.cn
OPTIBELT GmbH
www.optibelt.be
OPTIBELT POWER TRANSMISSION
INDIA PVT. LTD.
www.optibelt.in
OPTIBELT ESPAÑA, S.A.
www.optibelt.es
OPTIBELT AUSTRALIA PTY. LTD.
www.optibelt.com.au
OPTIBELT AG
www.optibelt.it
OPTIBELT INDONESIEN
www.optibelt.id
OPTIBELT PHILIPPINEN
www.optibelt.ph
OPTIBELT MEXIKO
www.optibelt.mx
OPTIBELT VIETNAM
www.optibelt.vn
OPTIBELT THAILAND
www.optibelt.th
3
Ribbed belTs and Ribbed belT Pulleys
1.
a
2.
3.
5.
4.
b
7.
d
6.
c
8.
ribbed Belts
ribbed Belt Pulleys
1/7/8 optibelt Rb
Ribbed Belts, Profile PJ
Lengths: 280-2489 mm
Other dimensions on request
A
optibelt Rbs
ribbed Belt Pulleys for Cylindrical Bore
B
optibelt Rbs
ribbed Belt Pulleys for taper Bushes
B
optibelt Rbs
ribbed Belt Pulleys with taper Bushes
B
optibelt Rbs
ribbed Belt Pulleys with taper Bushes
2/6
optibelt Rb
Ribbed Belts, Profile PK
3
optibelt Rb
Ribbed Belts, Profile PH
4
optibelt Rb
Ribbed Belts, Profile PM
Lengths: 2286-15 266 mm
5
optibelt Rb
Ribbed Belts, Profile PL
optibelt Rb
Elastic ribbed Belts
Profiles: EPH, EPJ on request (not shown)
4
Contents
Introduction ............................................................................................ 1
Distribution Organisation of the Arntz OPTIBELT Group ................................ 2
Ribbed Belts and Ribbed Belt Pulleys ......................................................... 4
Product Description
Standard Range optibelt RB Ribbed Belts.................................................... 7
Elastic optibelt ERB Ribbed Belts / Special Designs ..................................... 8
Characteristics – Application Areas
Elastic optibelt ERB Ribbed Belts / Roller Conveyor .................................. 9
Special Designs ............................................................................... 10-11
Automotive Drives optibelt CAR POWER RBK ........................................... 12
Standard Range
Ribbed Belts .................................................................................... 13-14
Drive Design
Abbreviations Used in Formulae .............................................................. 15
OPTIBELT Power Rating PN – Arc of Contact Correction Factor c1 ................ 16
Belt Length Correction Factor c3 ......................................................... 17-18
Minimum Allowance x/y above and below Drive Centre Distance anom........ 19
Drive Service Factor c2 .......................................................................... 20
A Guide to Selecting Ribbed Belt Profiles ................................................ 21
Formulae and Calculation Example .................................................... 22-24
Drive Design – optibelt CAP.................................................................... 25
Power Ratings
optibelt RB Ribbed Belts, Profile PH .......................................................... 26
optibelt RB Ribbed Belts, Profile PJ ........................................................... 27
optibelt RB Ribbed Belts, Profile PK .......................................................... 28
optibelt RB Ribbed Belts, Profile PL ........................................................... 29
optibelt RB Ribbed Belts, Profile PM ......................................................... 30
Contents
Special Drives
V-Flat Drives .................................................................................... 31-32
Ribbed Belt Pulleys
Measuring Pulleys – Length Measuring Conditions
to DIN 7867 / ISO 9982..................................................................... 35
Tension/Guide Idlers ........................................................................ 33-34
Dimensions to DIN 7867 / ISO 9982...................................................... 36
Standard Range optibelt TB Taper Bushes ................................................. 37
Ribbed Belt Pulleys for Taper Bushes, Profile PJ...................................... 38-41
Ribbed Belt Pulleys for Taper Bushes, Profile PL...................................... 42-46
Ribbed Belt Pulleys for Cylindrical Bore, Profile PJ....................................... 47
Design Hints
Ribbed Belt Tension........................................................................... 48-51
Frequency Tension Gauge optibelt TT MINI S ............................................ 52
Frequency Tension Gauge optibelt TT OPTICAL .......................................... 53
Determining the Static Shaft Loading / Shaft Loading
under Dynamic Conditions .................................................................. 54
Length Tolerances – Installation and Maintenance ...................................... 55
Ribbed Belt Widths ............................................................................... 56
Problems – Causes – Remedies .......................................................... 57-58
Additional Range
optibelt TT MINI S .............................................................................. 59
optibelt LASER POINTER II ................................................................... 59
OPTIBELT Pulley Groove Gauges .......................................................... 59
Data Sheet for Drive Calculation/Checking.......................................... 60-61
6 © Arntz OPTIBELT Group, Germany
Product Description
Standard Range optibelt RB Ribbed Belts
Construction
OPTIBELT ribbed belts consist of:
Standard Profiles
1
2
PH
3
1 Belt top surface: wear resistant polychloroprene
rubber compound
2 Tension cord: low-stretch polyester cord embedded
in an adhesive rubber compound
3 Base compound: parallel V-shaped ribs of a wear
resistant rubber compound
≈ 2.5
1.60
PJ
Characteristics
• Combines the high flexibility of the flat belt with the high
power transmission capability of the traditional V-belts
• Small pulley diameters
• Large speed ratios possible
• Good frictional power transmission and high power
transmission capability
• Insensitive to torque impulses and short-term overloading
Applications
Profile PH
Domestic appliances, medical appliances, machine tools,
small conveyors, conveyor belt, paper transport machines
≈ 3.3
2.34
PK
≈ 4.6
Profile PJ
Small compressors, cement mixers, white goods, small tools
3.56
Profile PK
Fans, air conditioning, concrete saws, wood saws, industrial
washing machines
Profile PL
Compressors (> 30 kW), industrial washing machines
Profile PM
Paper industry, agricultural machines (silage cutter), sugar
cane cutter
PL
≈ 7.0
4.70
PM
≈ 13.0
9.40
PRoducT descRiPTion
elasTic optibelt eRb Ribbed belTs / sPecial designs
construction
The elastic ribbed belts of profiles EPH, EPJ and EPK consist
of:
special versions
ePh
top surface
elastic
tension cord
≈ 2.5
1.60
base
compound
the elastic ribbed belt is characterised by the highly individual options for designing and adapting it for different drive
solutions particularly for fixed distances between centres.
In addition, the running properties of the ribbed belt can be
further optimised by additional refinement of the surface on
the ribbed side.
advantages and characteristics
• Assembly is possible on fixed centres with no need for
adjustment for belt tensioning
• Good damping performance and shock load resistance
due to high elasticity of belt
• Maintenance-free and no retensioning required
• Easy assembly in service areas
• Allows individual design of tension and elongation
characteristics
dimensions
Belt lengths depend on the profile, from 250 mm to
2500 mm.
• Ribbed belt – electrically conductive on request
• Ribbed belt – high voltage resistant on request
• PAK optimised – on request
Ribbed belt Pulleys
Extensive standard range (see range list); special pulleys on
request.
Please contact our Applications Engineering Department for
individual drive solutions.
8
ePJ
≈ 3.3
2.34
ePK
≈ 4.6
3.56
PRoducT descRiPTion
chaRacTeRisTics – aPPlicaTion aReas
elasTic optibelt eRb Ribbed belTs / RolleR conveyoR
Retensioning not necessary –
extended service intervals –
optimal damping of drive vibrations
recently, some roller conveyor belt systems have been
equipped with elastic ribbed belts of the model optibelt ErB.
those belts keep the single rolls moving and do not need any
retensioning in continuous industrial operation. thus, they are
virtually maintenance-free. For this reason, elastic ribbed belts
are now also deployed in transport technology.
OPtIBELt ribbed belts offer many advantages for end users,
too, such as manufacturing companies that use roller conveyor belts as a means of conveyance to the warehouse.
thanks to the belt, the vibrations of the drive are better
absorbed, resulting in a smoothly running, extremely lowvibration roller drive. this leads to a minimised wear of the
components and extends the operational life of the individual
roller bearings. On the other hand, less vibration means less
noise and thus improved working conditions.
the advantages are more than obvious as elastic ribbed belts
do not have to be run in in the first place and do not therefore need to be retensioned. optibelt ErB belts gain the
required tension due to a higher basic tension and the systematic settling characteristics of the belts. retensioning can be
dispensed with as a result.
Given these obvious advantages for users and manufacturers,
there is only one definite goal concerning the optimisation of
many roller conveyor belt drives: the changeover from round
profile belts and timing belts to elastic ribbed belts made by
OPtIBELt.
9
PRoducT descRiPTion
sPecial designs
10
PRoducT descRiPTion
sPecial designs
oPTibelT Ribbed belTs wiTh aRaMid Tensile ReinfoRceMenT
oPTibelT Ribbed belTs wiTh sPecial coaTings
Ribbed belts with aramid Tensile Reinforcement
the extremely low-stretch aramid tension cords stand out in
comparison with conventional tensile reinforcement such as
polyester. they have almost twice the breaking strength of
fibres of the same thickness. Despite their high strength, the
fibre is flexible and has sufficient elasticity to cushion shocks
and vibrations.
OPtIBELt ribbed belts with aramid tensile reinforcement are
for use where
• maximum power transmission is called for,
• overall widths are restricted,
• minimum adjustment range is available for installation and
tensioning and
• high temperature impacts are present
ribbed belts with aramid tensile reinforcement are ideal for
use in drives with heavy wear in mechanical engineering,
special-purpose engineering, agricultural engineering and in
garden tools.
It is not possible to go into the entire range of criteria in this
manual. Please get in touch with our applications engineers
for in-depth advice.
Profiles
PK/PL with 8M or 14M surface
oPTibelT Ribbed belts
with special coatings
Due to the huge variety of coatings and finishing possibilities
plus the properties of the ribbed belt, OPtIBELt has developed innovative solutions in the field of conveying technology. OPtIBELt ribbed belts can be provided with an additional top surface coating. the coating is applied in a special
adhesive procedure.
ribbed belts with a patterned top surface can be used in
place of expensive conveyor belts. they run singly or with
several belts adjacent to each other and transport the goods
to be conveyed horizontally and at up and down gradients.
Vertical conveyance is possible if the ribbed belts are
arranged back to back and the media conveyed is pressed
together between the two belts.
applications
Examples of the some of the many successful uses for
OPtIBELt ribbed belts with coatings include:
• Conveying doors, parts of cabinets, veneer and plastic
panels for wood-working
• Conveying car body parts and sharp-edged sheet metal
panels in the automotive industry
• Conveying cartons and boxes in the packaging industry
Pulleys
Timing belt pulleys HTD® or rPP® and ribbed belt pulleys
profile PK and PL
applications
The optibelt OMEGA timing belt with additional ribbed PK
belt profile on the back cover of the belt is perfect for use in
mills, e.g. food, corn, fruit and flour mills, where the back
pulley has a reversible direction and slipping is necessary
when the drive blocks.
advantage
The rubber compound filled with aramid fibres is very wear
resistant. The back cover of the PK profile is moulded in one
operation with the timing belt.
11
PRoducT descRiPTion
auToMoTive dRives optibelt caR PoweR RbK
new engine designs demand more and more space saving. It
is not unusual to encounter small pulley diameters and limited
drive widths. Being extremely elastic and dimensionally
stable, OPtIBELt ribbed belts can adapt to the respective
drive geometry. They are flexible enough to find their path as
a serpentine drive through the motor labyrinth. The flexible
ribbed belt is extremely quiet and supple in its job of controlling the power train.
OPtIBELt ribbed belts drive ancillary units in cars, commercial vehicles and buses. they reduce vibration and give the
generator, air-conditioning compressor, and the power
steering pump the right spin.
characteristics
• Large speed ratios
• High power transmission
• minimum slip
• Largely oil and temperature resistant
• Vibration free and quiet
• Extraordinarily resilient
Profiles
PJ, PK, DPK
dimensions
2 PK from 786 to 905 mm
10 PK from 1108 to 2063 mm
11 PK from 1515 to 2055 mm
12 PK from 1165 to 2500 mm
3 EPK from 806 to 885 mm
6 DPK from 1188 to 1853 mm
7 DPK from 1360 to 1400 mm
Additional sizes on request.
applications
use in automotive engineering to drive the power train
12
1
2
3
4
1 Belt top surface:
wear resistant polychloroprene rubber compound
2 tension cord:
low-stretch polyester cord
3 Cushioning:
high-adhesion polychloroprene rubber compound
(cushion layer)
4 Base compound:
polychloroprene rubber compound
sTandaRd Range
Ribbed belTs
Profile
Position of the tension cord
Ph
rib pitch
(effective line)
s [mm]
PK
Pl
1.60 2.34 3.56 4.70
PM
9.40
2.50 3.30 4.60 7.00 13.00
Belt thickness
≈ h [mm]
Belt speed
≈ v [m/s]
60
60
50
40
30
db min [mm]
13
20
45
75
180
minimum pulley diameter
Effective line difference
dw = db + 2 hb
PJ
Profile PH
hb
0.80 1.25 1.60 3.50
5.00
Profile PJ
effective length lb
effective length lb
effective length lb
effective length lb
effective length lb
[mm]
[inch]
[mm]
[inch]
[mm]
[inch]
[mm]
[inch]
[mm]
[inch]
698
735
762
813
858
27.50
28.90
30.00
32.00
33.80
1397
1439
1475
1600
1854
55.00
56.70
58.10
63.00
73.00
280
330
356
362
381
11.00
13.00
14.00
14.30
15.00
1130
1150
1168
1194
1200
44.50
45.30
46.00
47.00
47.30
1915
1930
1956
1965
1981
75.40
76.00
77.00
77.40
78.00
864
886
955
965
975
34.00
34.90
37.60
38.00
38.40
1895
1915
1930
1956
1992
74.60
75.40
76.00
77.00
78.40
406
414
432
457
483
16.00
16.30
17.00
18.00
19.00
1222
1244
1262
1270
1285
48.10
49.00
49.70
50.00
50.60
1992
2083
2155
2210
2337
78.40
82.00
84.80
87.00
92.00
990
1016
1080
1092
1096
39.00
40.00
42.50
43.00
43.10
2083
2155
82.00
84.80
508
559
584
610
660
20.00
22.00
23.00
24.00
26.00
1301
1309
1316
1321
1333
51.20
51.50
51.80
52.00
52.50
2489
98.00
1168
1194
1200
1222
1230
46.00
47.00
47.20
48.10
48.40
711
723
737
762
813
28.00
28.50
29.00
30.00
32.00
1355
1371
1397
1428
1439
53.40
54.00
55.00
56.20
56.70
1262
1270
1285
1290
1301
49.70
50.00
50.60
50.80
51.20
836
864
914
955
965
32.90
34.00
36.00
37.60
38.00
1475
1549
1600
1651
1663
58.10
61.00
63.00
65.00
65.50
1309
1316
1321
1333
1371
51.50
51.80
52.00
52.50
54.00
1016
1092
1105
1110
1123
40.00
43.00
43.50
43.70
44.20
1752
1780
1854
1895
1910
69.00
70.00
73.00
74.60
75.20
note: Individually designed ribbed belts may deviate from the standard composition.
Please contact our Applications Engineering Department!
non standard lengths on request.
maximum number of ribs: Please contact our Applications Engineering
Department.
Profile PH is a non stock item.
ordering example:
For a five-rib ribbed belt with profile PJ
with an effective length 660 Lb: optibelt RB 5 PJ 660 Lb
13
Standard Range
Ribbed Belts
Profile PK
Profile PL
Profile PM
Effective length Lb
Effective length Lb
Effective length Lb
Effective length Lb
Effective length Lb
[mm]
[mm]
[mm]
[mm]
[inch]
[mm]
[inch]
954
991
1075
1194
1270
37.50
39.00
42.30
47.00
50.00
2286
2388
2515
2693
2832
90.00
94.00
99.00
106.00
111.50
[inch]
[inch]
[inch]
630•
648
698
730
775
24.80
25.50
27.50
28.70
30.50
1290•
1321•
1330
1345
1371•
50.80
52.00
52.40
53.00
54.00
800
812
830
865
875
31.50
32.00
32.70
34.00
34.50
1397•
1439•
1460
1520
1560
55.00
56.70
57.50
59.80
61.40
1333
1371
1397
1422
1562
52.50
54.00
55.00
56.00
61.50
2921
3010
3124
3327
3531
115.00
118.50
123.00
131.00
139.00
890
913
920
940
954
35.00
36.00
36.20
37.00
37.60
1570
1600•
1655
1690
1755
61.80
63.00
65.20
66.50
69.10
1613
1664
1715
1764
1803
63.50
65.50
67.50
69.50
71.00
3734
4089
4191
4470
4648
147.00
161.00
165.00
176.00
183.00
962
990
1015
1080
1090
37.80
39.00
40.00
42.50
43.00
1854•
1885
1930•
1956•
1980
73.00
74.20
76.00
77.00
78.00
1841
1943
1981
2020
2070
72.50
76.50
78.00
79.50
81.50
5029
5410
6121
6883•
7646•
198.00
213.00
241.00
271.00
301.00
1125
1150
1165
1190
1200•
44.30
45.30
45.90
46.80
47.20
2030
2050
2080
2120
2145
79.90
80.70
82.00
83.50
84.40
2096
2134
2197
2235
2324
82.50
84.00
86.50
88.00
91.50
8408•
9169•
9931•
10693•
12217•
331.00
361.00
391.00
421.00
481.00
1222•
1230•
1245
1270•
1285•
48.10
48.40
49.00
50.00
50.60
2170
2235•
2255
2362•
2460
85.40
88.00
88.80
93.00
96.90
2362
2476
2515
2705
2743
93.00
97.50
99.00
106.50
108.00
13741•
15266•
541.00
601.00
2845
2895
2921
2997
3086
112.00
114.00
115.00
118.00
121.50
3124
3289
3327
3492
3696
123.00
129.50
131.00
137.50
145.50
4051
4191
4470
4622
5029
159.50
165.00
176.00
182.00
198.00
5385
6096
212.00
240.00
2515•
2845•
99.00
112.00
Note: Individually designed ribbed belts may deviate from the standard composition.
Please contact our Applications Engineering Department!
Non standard lengths on request.
Maximum number of ribs: Please contact our Applications Engineering Department.
• non stock items
dRive design
abbReviaTions used in foRMulae
a
= Drive centre distance
anom = Drive centre distance, calculated with
a standard belt length
c1
= Arc of contact correction factor
c2
= Drive service factor
c3
= Belt length correction factor
[mm]
[mm]
ng = Speed of large pulley
[rpm]
nk = Speed of small pulley
[rpm]
n1 = Speed of driver pulley
[rpm]
n2 = Speed of driven pulley
[rpm]
P
[kW]
= Motor or normal running power
PB = Design power
[kW]
Pn = Power rating per rib
[kW]
s
[mm]
dbg = Effective diameter of large pulley
[mm]
dbk = Effective diameter of small pulley
[mm]
db1 = Effective diameter of driver pulley
[mm]
db2 = Effective diameter of driven pulley
[mm]
E
= Belt deflection per 100 mm span length
[mm]
Ea
= Belt deflection for a given span length
[mm]
f
= Load used to set belt tension per rib
h
= Belt thickness
[mm]
hb
= Effective line difference
[mm]
i
= Speed ratio
k
= Constant for calculation of centrifugal force
z
= Span length
[mm]
α = Angle of belt run = 90° –
°[degrees]
LbSt = Standard belt effective length
[mm]
β
°[degrees]
Lbth = Calculated belt effective length
[mm]
L
[n]
= Drive span length
Sa = minimum static shaft loading
[n]
t
= minimum static belt tension per rib
v
= Belt speed
[m/s]
x
= minimum adjustment required above
drive centre distance anom to compensate for
tensioning and retensioning
[mm]
= minimum adjustment required below
drive centre distance anom to allow for
belt installation
[mm]
y
[n]
= Number of ribs
β
2
= Arc of contact on small pulley
15
Drive Design
OPTIBELT Power Rating PN – Arc of Contact
Correction Factor c1
OPTIBELT power ratings P N shown in tables 5 to 9 are based
on internationally recognised formulae. These formulae
contain material constants which must be used in accordance
with the practices of the individual manufacturers. The PN
power rating formula is based on a specific tension ratio
between the tight and slack sides of the belt. The PN power
rating tables refer to the smallest loaded pulley in the drive.
The belt power ratings PN from the tables are given for:
• the effective diameter of small pulley dbk
• the speed of small pulley nk
• speed ratio i
• the arc of contact of the belt on small pulley β = 180°
• the ideal belt length for the particular belt profile.
From the given drive data, the power rating per rib can be
found which must then be modified by application of the arc
of contact correction factor c1 and belt length correction
factor c3.
Intermediate values can be found by linear interpolation.
The arc of contact correction factor c1 corrects the power
rating PN when the arc of contact of the belt is smaller than
180°, since the PN value of the arc of contact β = 180° was
determined on the small pulley dbk.
Table 1
dbg – dbk
anom
β≈
c1
0
0.05
0.10
0.15
0.20
180°
177°
174°
171°
168°
1.00
1.00
1.00
0.99
0.99
0.25
0.30
0.35
0.40
0.45
165°
162°
160°
156°
153°
0.99
0.99
0.99
0.98
0.98
0.50
0.55
0.60
0.65
0.70
150°
147°
144°
141°
139°
0.98
0.97
0.97
0.97
0.96
0.75
0.80
0.85
0.90
0.95
136°
133°
130°
126°
123°
0.96
0.95
0.95
0.94
0.94
1.00
1.05
1.10
1.15
1.20
119°
115°
112°
109°
106°
0.93
0.92
0.92
0.91
0.90
1.25
103°
1.30
100°
1.35 96°
1.40 92°
1.45 88°
0.89
0.89
0.87
0.86
0.85
1.50 84°
1.55 80°
1.60 77°
0.83
0.82
0.80
Intermediate lengths can be calculated by linear interpolation!
Drive Design
Belt Length Correction Factor c3
The belt length correction factor c3 takes into account the flex
rate in the particular belt profile in relationship to a standard
effective length.
This results in the following relationships:
ribbed belt length used > standard effective length c3 > 1.0
ribbed belt length used = standard effective length c3 = 1.0
ribbed belt length used < standard effective length c3 < 1.0
[( ) ]
0.09
Lb
c3 = 1 + Lbo
– 1 · 2.4
Lb = ribbed belt length used
Lbo = standard effective length
Table 2
Profile PH
Effective length
Lb
[mm]
c3
Profile PJ
Effective length
Lb
[mm]
c3
1956
1992
2083
2155
1.19
1.20
1.21
1.22
Effective length
Lb
[mm]
c3
Effective length
Lb
[mm]
c3
280
330
356
362
381
0.74
0.76
0.78
0.78
0.79
1309
1316
1321
1333
1355
1.05
1.05
1.05
1.05
1.06
559
698
735
762
813
0.96
0.96
0.97
0.98
1.00
858
864
886
914
955
1.01
1.01
1.01
1.02
1.03
406
414
432
457
483
0.80
0.81
0.82
0.83
0.84
1371
1397
1428
1439
1475
1.06
1.06
1.07
1.07
1.08
965
975
990
1016
1080
1.03
1.03
1.03
1.04
1.06
508
559
584
610
660
0.85
0.87
0.88
0.89
0.90
1549
1600
1651
1663
1752
1.09
1.10
1.10
1.10
1.12
1092
1096
1168
1194
1200
1.06
1.06
1.07
1.08
1.08
711
723
762
813
836
0.92
0.92
0.93
0.95
0.95
1780
1854
1895
1910
1915
1.12
1.13
1.13
1.14
1.14
1222
1230
1262
1270
1285
1.08
1.09
1.09
1.09
1.10
864
914
955
965
1016
0.96
0.97
0.98
0.98
1.00
1930
1956
1965
1981
1992
1.14
1.14
1.14
1.14
1.14
1290
1301
1309
1316
1321
1.10
1.10
1.10
1.10
1.10
1092
1105
1110
1123
1130
1.01
1.01
1.01
1.02
1.02
2083
2155
2210
2337
2489
1.16
1.17
1.17
1.18
1.20
1333
1371
1397
1439
1475
1.10
1.11
1.11
1.12
1.13
1150
1168
1194
1200
1222
1.02
1.03
1.03
1.03
1.04
1600
1854
1895
1915
1930
1.15
1.18
1.18
1.19
1.19
1244
1262
1270
1285
1301
1.04
1.04
1.04
1.05
1.05
Drive Design
Belt Length Correction Factor c3
Table 2
Profile PK
Effective
length Lb
[mm]
Profile PL
c3
Effective
length Lb
[mm]
c3
559
630
648
698
730
0.78
0.81
0.81
0.82
0.84
1956
1980
2030
2050
2080
1.04
1.05
1.05
1.05
1.06
775
800
812
830
865
0.85
0.85
0.86
0.86
0.87
2120
2145
2170
2235
2362
875
890
913
920
940
0.87
0.88
0.88
0.88
0.89
2460
2515
2743
2845
954
962
990
1015
1080
Effective
length Lb
[mm]
Profile PM
c3
Effective
length Lb
[mm]
c3
Effective
length Lb
[mm]
954
991
1075
1194
1270
0.83
0.84
0.86
0.88
0.89
4051
4191
4470
4622
5029
1.14
1.15
1.16
1.17
1.19
2286
2388
2515
2693
2832
0.87
0.88
0.89
0.91
0.92
1.06
1.06
1.07
1.09
1.09
1333
1371
1397
1422
1562
0.90
0.91
0.91
0.91
0.93
5385
6096
1.21
1.24
2921
3010
3124
3327
3531
0.92
0.93
0.94
0.95
0.96
1.09
1.10
1.12
1.13
1613
1664
1715
1764
1803
0.94
0.95
0.95
0.96
0.96
3734
4089
4191
4470
4648
0.98
1.00
1.00
1.01
1.02
0.89
0.89
0.90
0.90
0.92
1841
1943
1981
2020
2070
0.97
0.98
0.98
0.99
0.99
5029
5410
6121
6883
7646
1.04
1.06
1.08
1.11
1.13
1090
1100
1125
1150
1165
0.91
0.92
0.93
0.93
0.93
2096
2134
2197
2235
2324
1.00
1.00
1.01
1.01
1.02
8408
9169
9931
10693
12217
1.16
1.18
1.19
1.21
1.24
1190
1200
1222
1230
1245
0.94
0.94
0.94
0.94
0.95
2362
2476
2515
2705
2743
1.02
1.03
1.03
1.05
1.05
13741
15266
1.27
1.30
1270
1285
1290
1321
1330
0.95
0.95
0.95
0.96
0.96
2845
2895
2921
2997
3086
1.06
1.07
1.07
1.07
1.08
1345
1371
1397
1439
1460
0.96
0.97
0.97
0.98
0.98
3124
3289
3327
3492
3696
1.08
1.09
1.10
1.11
1.12
1520
1560
1570
1600
1655
0.99
0.99
1.00
1.00
1.01
1690
1755
1854
1885
1930
1.01
1.02
1.03
1.04
1.04
c3
dRive design
MiniMuM allowance x/y above and
below dRive cenTRe disTance anom
Table 3
effective length
lb
[mm]
Minimum allowance
Minimum allowance y [mm] – for ease of fitting
x [mm] –
for tensioning
Profile PH Profile PJ Profile PK Profile PL Profile PM
and retensioning
500
10
10
10
—
—
—
500 ≤ 1000
15
15
15
20
25
—
> 1000 ≤ 1500
20
15
15
20
25
—
> 1500 ≤ 2000
25
15
15
20
25
—
> 2000 ≤ 2500
30
20
20
20
25
40
> 2500 ≤ 3000
35
20
20
25
30
40
> 3000 ≤ 4000
45
—
—
25
30
45
> 4000 ≤ 5000
55
—
—
30
35
45
> 5000 ≤ 6000
65
—
—
30
35
50
> 6000 ≤ 7500
85
—
—
—
—
55
≤
>
Minimum allowance
19
Drive Design
Drive Service Factor c2
The drive service factor c2 takes into account the length of
time the drive is operational in a 24 hour period and the type
of driver and driven units. It applies exclusively to two pulley
drives. It does not take into account other working conditions,
such as drives with tension, guide and idler pulleys. Pages 33
to 34 give the design bases for drives with more than two
pulleys. Extreme operating conditions such as aggressive
dust, particularly high temperatures or the influence of various
media are not considered. Since it is practically impossible
to condense every possible combination of drive unit/driven
machine/operating conditions into a standard-compliant form
the drive service factors are guide values. In special cases
e.g. high starting load (direct starting of fans), drives with
high starting frequency, unusual shock loading, or the regular
acceleration/deceleration of mass, the load factor should be
increased.
Typical value:
Where the starting load is more than 1.8 times
the standard running load, the value should be
divided by 1.5 to obtain the minimum drive service
factor c2 ; example: starting load factor MA = 3.0;
c2 selected as 2.0. Where the application is
especially problematical please consult our
applications engineers.
Table 4
Types of Prime Mover
AC and three-phase motors
with normal starting load (up
to 1.8 times normal running
load), e.g. synchronous and
single-phase motors with auxiliary phase, three-phase motors with direct on-line start,
star delta or commutator
starter, DC shunt wound
motors, internal combustion

engines
and
turbines
n > 600 rpm
AC and three-phase motors
with high starting load (more
than 1.8 times normal running load), e.g. single-phase
motors with high starting
torque, DC motors series and
compound wound, internal
combustion engines and turbines n ≤ 600 rpm
Hours per day duty
Types of Driven Machine
10 and over 10
over 16
under
to 16
10 and over 10
over 16
under
to 16
Consistent duty,
only low masses to
be accelerated
Agitators for liquids with uniform consistency,
generators up to 0.05 kW, small conveyor belts
for lightweight material, fans up to 0.05 kW,
rotary pumps up to 0.05 kW
1.1
1.1
1.2
1.1
1.2
1.3
Consistent light duty
operation, low
masses to be
accelerated
Conveyor belts for lightweight material,
fans from 0.06 to 0.1 kW,
rotary pumps from 0.06 to 0.1 kW
1.1
1.2
1.3
1.2
1.3
1.4
Inconsistent duty
operation, mediumsized masses to be
accelerated
Vibrating screens, pit fans, agitators for liquids
with fluctuating consistency, compressors, screw
presses, woodworking machinery, conveyor
belts for heavy material, elevators, conveyor
belts, fans above 0.8 kW, drills, milling
machines, grinding machines, light lathes,
bakery machinery, circular spinning frames,
rotary pumps above 0.11 kW, laundry
machinery
1.2
1.3
1.4
1.3
1.4
1.5
Inconsistent medium
duty, medium-sized
shocks and masses
to be accelerated
Kneaders, mills, mixers, pumps, drying drums,
general milling equipment, centrifuges, agitators
for plastic materials with fluctuating consistency,
bucket conveyors, centrifugal fans, parallel
planing machines, weaving looms
1.3
1.4
1.5
1.4
1.5
1.6
Inconsistent duty
operation, high
shocks and masses
to be accelerated
Paper making machinery, plate conveyors,
slag mills, calenders, drilling rigs,
heavy duty lathes, punches, shears,
draw benches, piston pumps up to 2 cylinders
1.4
1.5
1.6
1.5
1.7
1.8
1.6
1.7
1.8
1.6
1.8
2.0
Dredgers, heavy duty grinders, rolling mills,
Inconsistent duty
operation, extra high mixers, sawmills, calenders
masses to be
accelerated, extra
high shocks
dRive design
a guide To selecTing Ribbed belT PRofiles
By using the following diagram and considering economy
and size it is possible to determine the best ribbed belt
profile. Optimum utilisation of power and efficiency is
achieved by the selection of the largest possible pulley
diameter in relation to the profile used. The limits to the
permissible circumferential speeds for ribbed belts must be
observed:
Profile
Profile
Profile
Profile
Profile
PH
PJ
PK
PL
PM
vmax
vmax
vmax
vmax
vmax
=
=
=
=
=
60
60
50
40
35
m/s
m/s
m/s
m/s
m/s
Experience has shown that minimum pulley diameters should
be avoided. these drives require a larger number of ribs and
consequently broad pulleys. As a result, they are cost-intensive. the ribbed belt width should not be larger than the
effective diameter of the small pulley.
In such borderline cases the use of the next smaller belt
profile on similar pulley diameters will often save both cost
and space.
A check is also advisable if the point of interprofile in the
selection diagram used lies in the boundary areas between
two profiles.
Please contact our Applications Engineering Department in
the case of higher circumferential speeds.
Small pulley speed nk [rpm]
Diagram 1
Design power PB = P · c2 [kW]
21
dRive design
foRMulae and calculaTion exaMPle
Prime Mover
drive conditions
driven Machine
Operational hours per day: 8 hours
Number of starts: 20 per day
normal ambient temperature,
no exposure to oil and water
Electric motor
P = 13 kW
n1 = 2440 rpm
Start up: direct
Starting torque: mA = 2.7 Mn
Drive centre distance: between
350 and 400 mm acceptable
Effective diameter of driver pulley:
db1 ≤ 140 mm
formulae
Grinding spindle
P = 13 kW
n2 = 3100 ± 100 rpm
Start up: from idling
calculation example
drive service factor
c2 from table 4, page 20
c2 = 1.6
design power
PB = 13 · 1.6 = 20.80 kW
PB = P · c2
Belt profile selection
from diagram 1, page 21
speed ratio
db2 + 2 hb
n
d
i = 1 = w2 =
n2
dw1 db1 + 2 hb
Profile PL
i=
2440
= 0.769
3173
hb see page 32
effective diameters of ribbed belt pulleys
db1 see page 45
db2 = db1 · i + 2 hb (i – 1)
when db2 is known:
d
1
–1
db1 = b2 + 2 hb
i
i
( )
22
db1 = 123 mm selected
db2 = 123 mm · 0.769 + 2 · 3.5 (0.769 – 1) = 92.97 mm
db2 = 93 mm – see page 44
Drive Design
Formulae and Calculation Example
Formulae
Calculation Example
Recalculation of speed of driven machine
dw2
d + 2 hb
iactual= = b2
dw1
db1 + 2 hb
n1
n2 actual=
iactual
93 + 2 · 3.5 = 0.769
iactual= Required:
123 + 2 · 3.5
3100 ± 100 rpm
2440
= = 3173 rpm (Calculated speed meets
n2 actual
0.769
requirement)
Drive centre distance (suggested)
Recommendation:a > 0.7
(dbg + dbk)
(dbg + dbk)
a < 2
a = 380 mm suggested
Effective length of ribbed belt
Lbth ≈ 2 a + 1.57 (dbg + dbk) +
(dbg – dbk)2
4a
Lbth ≈ 2 · 380 + 1.57 · (123 + 93) +
(123 – 93)2
≈ 1099.7 mm
4 · 380
Nearest standard length from page 14 selected
Actual:
Lbth
π
β
α·π
= 2 a · sin + (dbg + dbk) + (dbg – dbk)
2
2
180°
LbSt = 1075 mm
Drive centre distance
Calculated from LbSt and Lbth
LbSt – Lbth
2
Lbth – LbSt
< Lbth) anom ≈ a –
2
(when LbSt > Lbth) anom ≈ a +
(when LbSt
1099.7 – 1075
anom ≈ 380 – ≈ 367.65 mm
2
Actual:
anom
π
LbSt – (dbg + dbk)
2
= +
4
[
]
π
LbSt – (dbg + dbk) 2 (dbg – dbk)2
2
–
8
4
Minimum allowance x/y above and below drive
centre distance anom
x/y from table 3, page 19
x ≥ 20 mm / y ≥ 25 mm
Speed
dwk · nk (dbk + 2 · hb) · nk
v= =
19100
19100
(93 + 2 · 3.5) · 3173
v= = 16.61 m/s
19100
Drive Design
Formulae and Calculation Example
Formulae
Calculation Example
Arc of contact correction factor and arc of contact
dbg – dbk
anom
123 – 93
= 0.082
368
β ≈ 175°
linearly interpolated
c1= 1.0
}
Approximate β° and c1 from table 1, page 16
dbg – dbk
β
Actual: cos =
2
2 anom
Belt length correction factor
c3 = 0.86
c3 from table 2, page 17
Power rating per rib
{
dbk= 93 mm
Profile PL
nk = 3173 rpm
PN for
from table 8, page 29
1
i∗= = 1.3
0.769
The condition i ≥ 1 applies for selecting the speed ratio
power increment.
PN = 2.28 + 0.2 = 2.48 kW
Number of ribs
z=
13 · 1.6
z = = 9.74
2.48 · 1.0 · 0.86
P · c2
PN · c1 · c3
Design:
1 optibelt RB ribbed belt 10 PL 1075
Minimum static belt tension per rib
500 · (2.03 – c1) · PB
T ≈ + k · v2
c1 · z · v
k from table
Profile
k
PH
PJ
PK
PL
PM
f [N]
(per Rib)
0.005 3.0
0.009 5.0
0.020 7.5
0.036
10.0
0.123
25.0
Minimum static shaft loading
β
Sa ≈ 2 T · sin · z
2
500 · (2.03 – 1.0) · 20.8
T ≈ + 0.036 · 16.62 ≈ 75 N
1.0 · 10 · 16.6
Sa ≈ 2 · 75 · 0.9986 · 10 ≈ 1500 N
Belt deflection for a given span length
Ea ≈
E·L
100
2.5 · 367.0
Ea ≈ ≈ 9 mm
100
E from diagram 2, page 49
L = anom · sin
24 β
2
E ≈ 2.5 mm
For explanation see chapter
on tensioning on page 48
© Arntz OPTIBELT Group, Germany
L = 367.6 · 0.9986 = 367.0 mm
dRive design
optibelt caP
to design drive with:
– optibelt RB Ribbed Belt 10 PL 1075 Lb
–
–
–
–
optibelt
optibelt
optibelt
optibelt
RBS Ribbed Belt Pulley for Taper Bushes TB 10 PL 123
TB Taper Bush 2012 (Bore Diameter 14-50 mm)
RBS Ribbed Belt Pulley for Taper Bushes TB 10 PL 93
TB Taper Bushes 1610 (Bore Diameter 14-42 mm)
Tolerances/Indications
Prime mover
Driven machine
Design power
Driver unit output
Driver pulley torque
Speed of driver unit
Effective output speed
:
Electric motor
Effective drive centre distance
Effective speed ratio
Allowance for installation
Allowance for tensioning
PB:
P:
M:
n1:
n2:
db1:
db2:
:
a:
i:
y:
x:
20.80
13.00
51
2440
3172
123.00
93.00
1075
367.55
0.77
25.00
20.00
Effective drive service factor
Belt speed
Flexing cycles
Power rating per belt
Arc of contact correction factor
Belt length correction factor
Arc of contact for small pulley
Pulley face width
Span length
c2:
v:
f B:
P n:
c1:
c3:
β:
b2:
l:
1.64
16.61
30.90
2.49
1.00
0.86
175.32
48.90
367.24
zth:
:
Sast:
Sast:
Sadyn:
9.74
--1941
1493
1308
Calculated number of belts
Drive unit weight
Static shaft loading, initial installation
Static shaft loading, used belt
Dynamic shaft loading
Belt tension methods
for predetermined c2 =
1. OPTIKRIK II
Initial installation
1.60
kW
kW
Nm
1/min
1/min
mm
mm
mm
mm
1.7 %
mm
mm
–55
1/min
–12.452 mm
m/s
1/s
kW
°
mm
mm
kg
--N
N
for predetermined c2 = 1.60
Operating voltage
New belt
Used belt
Static shaft loading per belt:
971 N
747 N
Test load:
100 N
100 N
Deflection:
7.34 mm
8.45 mm
:
2.85 mm
2.11 mm
70.72 1/s
62.02 1/s
2. Deflection with tension gauge
3. Length addition per 1000 mm belt length
4. optibelt TT 3 / TT MINI Frequency Tension Gauge
Frequency:
Concerning liability consult our general terms and conditions.
25
Profile PH
Power rating PN [kW] per rib for β = 180°
and Lb = 813 mm
v [m/s]
Table 5
2
O
5
O
nk
[rpm]
Effective diameter of small pulley dbk [mm]
13
17
20
25
31,5
35,5
40
45
50
63
71
80
Arc of contact correction factor [kW]
per rib for speed ratio i
1.01 1.06 1.27 > 1.57
tototo
1.05 1.26 1.57
7000.010.020.020.030.040.050.050.060.070.090.100.11
9500.010.020.030.040.050.060.070.080.090.110.130.15
14500.020.030.040.060.080.090.100.110.130.170.190.21
28500.030.050.070.100.140.160.180.210.230.300.340.38
0.01
0.01
1000.000.000.000.010.010.010.010.010.010.020.020.02
3000.010.010.010.010.020.020.020.030.030.040.050.05
5000.010.010.020.020.030.030.040.040.050.060.070.08
7000.010.020.020.030.040.050.050.060.070.090.100.11
9000.010.020.030.040.050.060.070.080.080.110.120.14
10000.010.020.030.040.050.060.070.080.090.120.130.15
11000.020.020.030.040.060.070.080.090.100.130.150.17
12000.020.030.030.050.060.070.080.100.110.140.160.18
13000.020.030.040.050.070.080.090.100.120.150.170.19
14000.020.030.040.050.070.080.100.110.130.160.180.21
15000.020.030.040.060.080.090.100.120.130.170.190.22
16000.020.030.040.060.080.100.110.130.140.180.200.23
17000.020.040.050.060.090.100.120.130.150.190.220.24
18000.020.040.050.070.090.110.120.140.160.200.230.26
19000.020.040.050.070.100.110.130.150.160.210.240.27
20000.020.040.050.070.100.120.130.150.170.220.250.28
21000.020.040.060.080.100.120.140.160.180.230.260.29
22000.030.040.060.080.110.130.150.170.190.240.270.31
0.01
23000.030.050.060.080.110.130.150.170.190.250.280.32
0.01
24000.030.050.060.090.120.140.160.180.200.260.290.33
0.01
25000.030.050.060.090.120.140.160.190.210.270.300.34
0.01
26000.030.050.070.090.130.150.170.190.220.280.310.35
0.01
27000.030.050.070.100.130.150.170.200.220.290.320.37
0.01
28000.030.050.070.100.130.160.180.210.230.300.330.38
0.01
0.01
29000.030.060.070.100.140.160.180.210.240.300.340.39
0.01
0.01
30000.030.060.080.100.140.170.190.220.240.310.350.40
0.01
0.01
31000.030.060.080.110.150.170.200.220.250.320.370.41
0.01
0.01
32000.030.060.080.110.150.170.200.230.260.330.380.42
0.01
0.01
33000.030.060.080.110.150.180.210.240.270.340.390.43
0.01
0.01
34000.040.060.080.120.160.180.210.240.270.350.390.44
0.01
0.01
35000.040.060.090.120.160.190.220.250.280.360.400.46
0.01
0.01
36000.040.070.090.120.170.190.220.260.290.370.410.47
0.01
0.01
37000.040.070.090.130.170.200.230.260.290.380.420.48
0.01
0.01
38000.040.070.090.130.170.200.230.270.300.380.430.49
0.01
0.01
0.01
39000.040.070.090.130.180.210.240.270.310.390.440.50
0.01
0.01
0.01
40000.040.070.100.130.180.210.240.280.310.400.450.51
0.01
0.01
0.01
41000.040.070.100.140.190.220.250.290.320.410.460.52
0.01
0.01
0.01
42000.040.080.100.140.190.220.250.290.330.420.470.53
0.01
0.01
0.01
44000.040.080.100.150.200.230.260.300.340.430.490.55
0.01
0.01
0.01
46000.040.080.110.150.210.240.270.310.350.450.510.57
0.01
0.01
0.01
48000.050.080.110.160.210.250.280.330.370.470.520.59
0.01
0.01
0.01
50000.050.090.120.160.220.260.290.340.380.480.540.60
0.01
0.01
0.01
52000.050.090.120.170.230.260.300.350.390.500.560.62
0.01
0.01
0.01
54000.050.090.120.170.240.270.310.360.400.510.570.64
0.01
0.01
0.01
56000.050.090.130.180.240.280.320.370.420.530.590.66
0.01
0.01
0.01
58000.050.100.130.180.250.290.330.380.430.540.610.67
0.01
0.01
0.01
60000.050.100.130.190.260.300.340.390.440.560.620.69
0.01
0.01
0.01
62000.060.100.140.190.260.310.350.400.450.570.640.70
0.01
0.01
0.01
64000.060.110.140.200.270.310.360.410.460.580.650.72
0.01
0.01
0.01
66000.060.110.140.200.280.320.370.420.470.600.660.73
0.01
0.01
0.02
68000.060.110.150.210.290.330.380.430.490.610.680.75
0.01
0.01
0.02
70000.060.110.150.210.290.340.390.440.500.620.690.76
0.01
0.01
0.02
72000.060.120.150.220.300.350.400.450.510.630.700.77
0.01
0.01
0.02
74000.060.120.160.220.310.350.410.460.520.650.710.78
0.01
0.01
0.02
76000.060.120.160.230.310.360.420.470.530.660.730.79
0.01
0.01
0.02
78000.060.120.170.230.320.370.420.480.540.670.740.80
0.01
0.01
0.02
80000.070.130.170.240.330.380.430.490.550.680.750.81
0.01
0.01
0.02
82000.070.130.170.240.330.380.440.500.560.690.760.82
0.01
0.01
0.02
84000.070.130.180.250.340.390.450.510.570.700.770.83
0.01
0.02
0.02
86000.070.130.180.250.340.400.460.520.580.710.780.83
0.01
0.02
0.02
88000.070.130.180.260.350.410.460.530.590.720.780.84
0.01
0.02
0.02
90000.070.140.180.260.360.410.470.540.590.730.790.85
0.01
0.02
0.02
92000.070.140.190.270.360.420.480.540.600.740.800.85
0.01
0.02
0.02
94000.070.140.190.270.370.430.490.550.610.740.810.86
0.01
0.02
0.02
96000.070.140.190.280.380.430.500.560.620.750.810.86
0.01
0.02
0.02
98000.080.150.200.280.380.440.500.570.630.760.820.86
0.01
0.02
0.02
100000.080.150.200.280.390.450.510.580.640.770.820.86
0.01
0.02
0.02
103000.080.150.210.290.400.460.520.590.650.770.830.86
0.01
0.02
0.02
106000.080.150.210.300.400.470.530.600.660.780.830.86
0.01
0.02
0.02
109000.080.160.210.300.410.480.540.610.670.790.840.86
0.01
0.02
0.02
115000.080.160.220.320.430.490.560.630.690.800.840.84
0.02
0.02
0.03
121000.090.170.230.330.440.510.580.650.700.810.830.82
0.02
0.02
0.03
125000.090.170.240.340.450.520.590.660.710.810.830.80
0.02
0.02
0.03
Where v > 60 m/s, please consult our Applications Engineers!
10
O
20
O
30
O
40
O
v [m/s]
Profile PJ
Power Rating PN [kW] per Rip for β = 180°
and Lb = 1016 mm
v [m/s]
Table 6
2
O
5
O
10
O
nk
[rpm]
700
950
1450
2850
100
300
500
700
900
1100
1200
1300
1400
1500
1600
1700
1800
1900
2000
2100
2200
2300
2400
2500
2600
2700
2800
2900
3000
3100
3200
3300
3400
3500
3600
3700
3800
3900
4000
4100
4200
4300
4400
4500
4600
4700
4800
4900
5000
5100
5200
5300
5400
5500
5600
5700
5800
6000
6200
6400
6600
6800
7000
7200
7400
7600
7800
8000
8200
8400
8600
8800
9000
9200
9400
9700
9900
10100
10500
20
25 31,5 35,5
40
45
50
63
71
80
90
100
112
125
140
1.01 1.06 1.27 > 1.57
tototo
160 1.05 1.26 1.57
0.040.050.070.080.100.110.130.160.180.210.240.260.300.330.370.420.01
0.050.070.090.110.130.140.160.210.240.280.310.350.390.440.490.560.010.01
0.060.090.130.150.180.210.240.310.350.400.450.510.570.630.710.810.010.010.01
0.110.160.230.280.320.380.430.560.640.720.820.911.021.141.271.430.010.020.02
0.010.010.010.020.020.020.020.030.030.040.040.050.050.060.060.07
0.020.030.030.040.050.050.060.080.090.100.110.120.140.160.170.20
0.030.040.050.060.070.080.090.120.140.160.180.200.220.250.270.31
0.040.050.070.080.100.110.130.160.180.210.240.260.300.330.370.420.01
0.040.060.090.100.120.140.160.200.230.260.300.330.370.420.460.530.010.01
0.050.070.100.120.140.160.190.240.280.310.360.400.440.500.560.630.010.01
0.050.080.110.130.150.180.200.260.300.340.380.430.480.540.600.680.010.01
0.060.090.120.140.160.190.220.280.320.360.410.460.520.580.640.730.010.010.01
0.060.090.130.150.180.200.230.300.340.390.440.490.550.620.690.780.010.010.01
0.070.100.140.160.190.220.240.320.360.410.470.520.590.650.730.830.010.010.01
0.070.100.140.170.200.230.260.340.380.440.490.550.620.690.770.880.010.010.01
0.070.110.150.180.210.240.270.360.410.460.520.580.650.730.820.930.010.010.01
0.080.110.160.190.220.250.290.370.430.480.550.610.690.770.860.980.010.010.01
0.080.120.170.200.230.260.300.390.450.510.580.640.720.800.901.020.010.010.01
0.080.120.170.200.240.280.310.410.470.530.600.670.750.840.941.070.010.010.01
0.080.130.180.210.250.290.330.430.490.560.630.700.790.880.981.110.010.010.02
0.090.130.190.220.260.300.340.450.510.580.650.730.820.911.021.160.010.010.02
0.090.140.190.230.270.310.350.460.530.600.680.760.850.951.061.200.010.010.02
0.090.140.200.240.280.320.370.480.550.620.710.790.880.981.101.240.010.010.02
0.100.150.210.250.290.340.380.500.570.650.730.820.911.021.141.290.010.010.02
0.100.150.220.260.300.350.390.520.590.670.760.840.941.051.171.330.010.010.02
0.100.160.220.260.310.360.410.530.610.690.780.870.981.091.211.370.010.020.02
0.110.160.230.270.320.370.420.550.630.710.810.901.011.121.251.410.010.020.02
0.110.170.240.280.330.380.430.570.650.730.830.931.041.151.281.450.010.020.02
0.110.170.240.290.340.390.450.580.670.760.860.951.071.191.321.490.010.020.02
0.110.170.250.300.350.400.460.600.680.780.880.981.101.221.351.530.010.020.02
0.120.180.260.300.360.410.470.620.700.800.901.011.131.251.391.560.010.020.02
0.120.180.260.310.370.430.480.630.720.820.931.031.151.281.421.600.010.020.02
0.120.190.270.320.380.440.500.650.740.840.951.061.181.311.461.640.010.020.02
0.130.190.280.330.380.450.510.670.760.860.971.081.211.341.491.670.010.020.03
0.130.200.280.340.390.460.520.680.780.881.001.111.241.371.521.710.010.020.03
0.130.200.290.340.400.470.530.700.800.901.021.131.271.401.551.740.020.020.03
0.130.210.300.350.410.480.550.710.810.921.041.161.291.431.591.770.020.020.03
0.140.210.300.360.420.490.560.730.830.941.071.181.321.461.621.800.020.020.03
0.140.210.310.370.430.500.570.750.850.961.091.211.351.491.651.840.020.020.03
0.140.220.320.370.440.510.580.760.870.981.111.231.371.521.681.870.020.020.03
0.140.220.320.380.450.520.590.780.891.001.131.261.401.551.701.900.020.020.03
0.150.230.330.390.460.530.610.790.901.021.151.281.421.571.731.920.020.020.03
0.150.230.330.400.470.540.620.810.921.041.181.301.451.601.761.950.020.020.03
0.150.230.340.400.480.550.630.820.941.061.201.331.471.631.791.980.020.030.03
0.150.240.350.410.480.560.640.840.951.081.221.351.501.651.812.000.020.030.03
0.160.240.350.420.490.570.650.850.971.101.241.371.521.681.842.030.020.030.03
0.160.250.360.430.500.580.660.870.991.121.261.391.551.701.862.050.020.030.03
0.160.250.370.430.510.590.680.881.011.141.281.421.571.721.892.070.020.030.04
0.160.260.370.440.520.600.690.901.021.161.301.441.591.751.912.090.020.030.04
0.170.260.380.450.530.610.700.911.041.171.321.461.621.771.932.12 0.010.020.030.04
0.170.260.380.460.540.620.710.931.051.191.341.481.641.791.952.13 0.010.020.030.04
0.170.270.390.460.550.630.720.941.071.211.361.501.661.821.982.15 0.010.020.030.04
0.170.270.400.470.550.640.730.961.091.231.381.521.681.842.002.17 0.010.020.030.04
0.180.280.400.480.560.650.740.971.101.251.401.541.701.862.022.19 0.010.020.030.04
0.180.280.410.480.570.660.760.981.121.261.421.561.721.882.032.20 0.010.020.030.04
0.180.280.410.490.580.670.771.001.131.281.441.581.741.902.052.22 0.010.020.030.04
0.180.290.420.500.590.680.781.011.151.301.451.601.761.922.072.23 0.010.020.030.04
0.190.290.430.510.600.700.801.041.181.331.491.641.801.952.102.25 0.010.020.030.04
0.190.300.440.530.620.720.821.071.211.361.521.671.831.992.132.27 0.010.030.040.04
0.200.310.450.540.640.740.841.091.241.401.561.711.872.022.162.28 0.010.030.040.05
0.200.320.470.550.650.760.861.121.271.431.591.741.902.052.182.28 0.010.030.040.05
0.200.320.480.570.670.780.881.151.301.461.621.771.932.072.202.29 0.010.030.040.05
0.210.330.490.580.680.790.901.171.321.491.651.801.962.102.212.28 0.010.030.040.05
0.210.340.500.590.700.810.921.201.351.521.681.831.982.122.222.27 0.010.030.040.05
0.220.350.510.610.710.830.941.221.381.541.711.862.012.132.23 0.010.030.040.05
0.220.350.520.620.730.850.961.241.401.571.741.882.032.152.23 0.010.030.040.05
0.220.360.530.630.740.860.981.271.431.601.761.912.052.162.23 0.010.030.040.06
0.230.370.540.640.760.881.001.291.451.621.791.932.072.172.22 0.010.030.050.06
0.230.370.550.660.770.901.021.311.481.651.811.952.082.172.21 0.010.030.050.06
0.240.380.560.670.790.911.041.331.501.671.831.972.092.182.20 0.010.030.050.06
0.240.390.570.680.800.931.061.361.521.691.851.992.102.18 0.010.040.050.06
0.240.390.580.690.820.951.071.381.541.711.872.002.112.17 0.010.040.050.06
0.250.400.590.710.830.961.091.401.561.731.892.012.122.16 0.010.040.050.06
0.250.410.600.720.840.981.111.421.591.751.912.032.122.15
0.010.040.050.07
Where v >
0.260.410.610.730.860.991.131.441.601.771.922.042.122.14
60 m/s, please 0.010.040.050.07
0.260.420.630.750.881.021.151.461.631.801.942.052.12
0.010.040.050.07
consult our
0.260.430.640.760.891.031.171.481.651.811.952.052.11 0.010.040.060.07
Applications
0.270.440.640.770.901.051.181.501.671.831.962.062.10
0.010.040.060.07
Engineers!
0.270.450.660.790.931.071.211.531.701.851.982.052.07
0.010.040.060.08
20
O
30
O
40
O
50
O
v [m/s]
Profile PK
Power Rating PN [kW] per Rib for β = 180°
and Lb = 1600 mm
v [m/s]
Table 7
2
O
5
O
10
O
20
O
nk
[rpm]
45
50
71
80
90 100 112 125 140 160 180 190 224 250 280 315
700 0.170.210.320.380.450.530.610.700.800.911.061.211.281.531.711.922.160.020.020.03
950 0.210.270.410.490.590.690.790.921.051.201.391.581.682.002.232.502.81 0.010.020.030.04
1450 0.290.370.580.700.840.991.141.321.511.732.012.282.422.863.193.563.97 0.010.040.050.06
2850 0.480.631.001.231.481.752.012.322.653.013.473.904.114.755.165.565.91 0.020.070.100.12
200 0.060.080.110.130.150.180.200.230.270.300.350.400.420.500.560.630.710.010.01
400 0.110.130.200.240.280.330.370.430.490.560.650.740.780.931.041.171.320.010.010.02
600 0.150.190.280.330.400.460.530.610.700.800.931.061.121.331.491.681.890.010.020.03
800 0.190.230.350.430.510.600.680.790.901.031.201.361.441.721.922.162.420.020.030.03
1000 0.220.280.430.520.610.720.830.961.091.251.451.661.762.092.342.622.93 0.010.020.030.04
1100 0.240.300.460.560.670.780.901.041.191.361.581.801.912.272.532.843.18 0.010.030.040.05
1200 0.250.320.500.600.720.850.971.121.281.471.701.942.062.442.733.053.41 0.010.030.040.05
1300 0.270.340.530.640.770.911.041.201.371.571.832.082.202.612.923.263.64 0.010.030.040.06
1400 0.290.360.560.680.820.961.111.281.471.671.952.212.352.783.103.463.86 0.010.030.050.06
1500 0.300.380.600.720.871.021.181.361.561.782.072.352.492.953.283.664.07 0.010.040.050.06
1600 0.320.400.630.760.921.081.241.441.641.882.182.482.623.113.463.854.28 0.010.040.050.07
1700 0.330.420.660.800.961.141.311.511.731.982.302.612.763.263.634.034.47 0.010.040.060.07
1800 0.340.440.690.841.011.191.381.591.822.072.412.732.893.413.794.214.65 0.010.040.060.08
1900 0.360.460.720.881.061.251.441.661.902.172.522.863.023.563.954.374.83 0.010.050.060.08
2000 0.370.480.750.921.101.311.501.741.982.272.632.983.153.714.114.544.99 0.010.050.070.08
2100 0.390.500.790.961.151.361.571.812.072.362.743.103.273.854.254.695.15 0.010.050.070.09
2200 0.400.520.821.001.201.411.631.882.152.452.843.213.403.984.404.835.29 0.010.050.070.09
2300 0.410.530.841.031.241.471.691.952.232.542.943.333.514.114.534.975.42 0.010.060.080.10
2400 0.420.550.871.071.281.521.752.022.312.633.043.443.634.244.665.105.54 0.010.060.080.10
2500 0.440.570.901.101.331.571.812.092.392.723.143.553.744.364.795.225.64 0.010.060.080.11
2600 0.450.590.931.141.371.621.872.162.462.803.243.653.854.484.905.335.74 0.020.060.090.11
2700 0.460.600.961.181.411.671.932.222.542.893.333.763.964.595.015.435.82 0.020.070.090.11
2800 0.470.620.991.211.461.721.982.292.612.973.433.864.064.695.115.525.88 0.020.070.090.12
2900 0.490.641.021.251.501.772.042.362.693.053.523.954.164.795.215.605.94 0.020.070.100.12
3000 0.500.651.041.281.541.822.102.422.763.133.614.054.254.895.305.675.97 0.020.070.100.13
3100 0.510.671.071.311.581.872.152.482.833.213.694.144.354.985.385.736.00 0.020.080.100.13
3200 0.520.681.101.351.621.922.212.542.903.293.774.224.435.065.455.786.01 0.020.080.110.14
3300 0.530.701.121.381.661.972.262.612.973.363.864.314.525.145.515.82 0.020.080.110.14
3400 0.540.711.151.411.702.012.312.673.033.433.934.394.605.215.575.85 0.020.080.110.14
3500 0.550.731.181.441.742.062.372.733.103.514.014.474.675.285.625.86 0.020.090.120.15
3600 0.560.741.201.481.782.102.422.783.163.584.084.544.755.345.655.87 0.020.090.120.15
3700 0.570.761.231.511.822.152.472.843.233.644.154.614.825.395.685.86 0.020.090.120.16
3800 0.580.771.251.541.852.192.522.903.293.714.224.684.885.435.70 0.020.090.130.16
3900 0.590.791.281.571.892.242.572.953.353.774.294.744.945.475.71 0.020.100.130.17
4000 0.600.801.301.601.932.282.623.013.413.834.354.804.995.505.72 0.020.100.130.17
4100 0.610.821.331.631.962.322.663.063.463.894.414.855.045.535.71 0.020.100.140.17
4200 0.620.831.351.662.002.362.713.113.523.954.474.915.095.545.69 0.020.100.140.18
4300 0.630.841.371.692.032.402.763.163.574.014.524.955.135.55 0.030.110.140.18
4400 0.640.861.401.722.072.442.803.213.634.064.575.005.175.56 0.030.110.150.19
4500 0.650.871.421.752.102.482.853.263.684.124.625.035.205.55 0.030.110.150.19
4600 0.660.881.441.782.142.522.893.313.734.174.675.075.235.54 0.030.110.150.19
4700 0.670.901.471.802.172.562.933.353.774.214.715.105.255.51 0.030.110.160.20
4800 0.680.911.491.832.202.602.973.403.824.264.755.135.275.48 0.030.120.160.20
4900 0.690.921.511.862.232.633.013.443.874.304.795.155.28 0.030.120.160.21
5000 0.690.931.531.882.272.673.053.483.914.344.825.165.28 0.030.120.170.21
5100 0.700.941.551.912.302.713.093.533.954.384.855.185.28 0.030.120.170.22
5200 0.710.961.571.942.332.743.133.573.994.424.875.185.28 0.030.130.170.22
5300 0.720.971.591.962.362.783.173.604.034.454.905.195.27 0.030.130.180.22
5400 0.730.981.621.992.392.813.203.644.074.484.925.185.25 0.030.130.180.23
5500 0.730.991.642.012.422.843.243.684.104.514.935.18 0.030.130.180.23
5600 0.741.001.652.042.452.873.273.714.134.544.945.16 0.030.140.190.24
5800 0.761.021.692.082.502.943.343.784.194.594.955.12 0.030.140.190.25
6000 0.771.051.732.132.552.993.403.844.254.624.95 0.040.150.200.25
6200 0.781.071.772.172.603.053.463.894.294.654.93 0.040.150.210.26
6400 0.801.091.802.212.653.103.513.944.334.664.90 0.040.160.210.27
6600 0.811.101.842.262.703.153.563.984.364.664.85 0.040.160.220.28
6800 0.821.121.872.292.743.203.604.024.384.66 0.040.170.230.29
7000 0.831.141.902.332.783.243.644.054.394.64 0.040.170.230.30
7200 0.841.161.932.372.823.283.684.074.394.60 0.040.180.240.30
7400 0.851.171.962.402.863.313.714.094.394.56 0.040.180.250.31
7600 0.861.191.982.432.893.343.734.104.37 0.040.190.250.32
7800 0.871.202.012.462.923.373.754.104.35 0.050.190.260.33
8000 0.881.212.032.492.953.403.774.104.31 0.050.200.270.34
8200 0.881.232.052.512.973.423.784.094.27 0.050.200.270.35
8400 0.891.242.082.543.003.433.784.074.21 0.050.210.280.36
8600
0.90
1.25
2.10
2.56
3.02
3.44
3.78
4.05
0.05
0.21
0.29
0.36
8800
0.90
1.26
2.11
2.58
3.03
3.45
3.77
4.01
0.05
0.22
0.29
0.37
9000
0.91
1.27
2.13
2.59
3.05
3.46
3.76
3.97
0.05
0.22
0.30
0.38
9200
0.91
1.28
2.14
2.61
3.06
3.46
3.74
3.92
0.05
0.23
0.31
0.39
9400
0.91
1.28
2.16
2.62
3.06
3.45
3.72
3.87
0.06
0.23
0.31
0.40
9600
0.91
1.29
2.17
2.63
3.07
3.44
3.69
0.06
0.23
0.32
0.41
Where v > 50 m/s,
9800
0.92
1.30
2.18
2.64
3.07
3.43
3.65
0.06
0.24
0.33
0.41
please consult our
10000
0.92
1.30
2.19
2.64
3.07
3.41
3.61
0.06
0.24
0.33
0.42
Applications
10200
0.92
1.31
2.19
2.65
3.06
3.39
0.06
0.25
0.34
0.43
Engineers!
10400
0.92
1.31
2.20
2.65
3.05
3.36
0.06
0.25
0.35
0.44
30
O
28 63
1.01 1.06 1.27 > 1.57
tototo
1.05 1.26 1.57
40
O
50
O
v [m/s]
Profile PL
and Lb = 2096 mm
v [m/s]
Table 8
5
O
10
O
20
O
nk
[rpm]
76
80
90
100
112
125
140
160
180
200
224
250
280
315
355
1.01 1.06 1.27 > 1.57
tototo
400 1.05 1.26 1.57
700 0.490.530.640.740.871.001.151.341.541.731.962.202.482.803.163.55 0.010.030.040.06
950 0.630.690.830.961.121.301.491.752.012.262.562.873.233.644.094.58 0.010.040.060.08
1450 0.890.971.171.371.601.852.142.512.883.233.654.094.585.125.716.32 0.020.070.090.12
2850 1.501.652.002.352.763.193.674.284.855.385.966.517.047.517.827.84 0.030.130.180.23
100 0.100.100.120.140.160.180.210.240.280.310.350.390.440.500.560.630.010.01
200 0.170.190.220.250.290.340.380.450.510.570.650.730.820.921.041.170.010.010.02
300 0.240.260.310.360.420.480.550.640.730.820.931.041.171.321.501.690.010.020.02
400 0.310.340.400.460.530.610.700.820.941.061.201.351.521.711.932.180.020.030.03
500 0.370.400.480.560.650.750.861.001.151.291.461.641.852.092.352.65 0.010.020.030.04
600 0.430.470.560.650.760.871.001.181.351.511.711.932.172.452.763.11 0.010.030.040.05
700 0.490.530.640.740.871.001.151.341.541.731.962.202.482.803.163.55 0.010.030.040.06
800 0.550.600.710.830.971.121.291.511.731.952.202.482.793.143.543.97 0.010.040.050.06
900 0.610.660.790.921.071.241.421.671.922.162.442.743.083.473.914.38 0.010.040.060.07
1000 0.660.720.861.001.171.351.561.832.102.362.673.003.373.804.274.78 0.010.050.060.08
1100 0.710.780.931.091.271.471.691.992.282.562.903.253.654.114.615.15 0.010.050.070.09
1200 0.760.831.001.171.371.581.822.142.452.763.123.503.934.414.945.51 0.010.060.080.10
1300 0.820.891.071.251.461.691.952.292.622.953.333.744.194.705.265.85 0.010.060.080.11
1400 0.870.941.141.331.561.802.082.442.793.143.553.974.454.985.566.16 0.020.070.090.11
1500 0.911.001.201.411.651.912.202.582.963.323.754.204.705.255.856.46 0.020.070.100.12
1600 0.961.051.271.491.742.012.322.733.123.503.954.424.945.516.126.74 0.020.070.100.13
1700 1.011.101.331.561.832.122.442.873.283.684.154.635.175.756.376.99 0.020.080.110.14
1800 1.061.151.401.641.922.222.563.003.433.854.344.845.395.996.617.22 0.020.080.120.15
1900 1.101.211.461.712.002.322.683.143.594.024.525.045.606.216.827.42 0.020.090.120.15
2000 1.151.251.521.782.092.422.793.273.734.184.705.235.806.417.027.59 0.020.090.130.16
2100 1.191.301.581.852.172.522.903.403.884.344.875.415.996.607.207.74 0.020.100.130.17
2200 1.241.351.641.922.262.613.013.534.024.505.045.596.176.787.367.86 0.020.100.140.18
2300 1.281.401.701.992.342.703.123.654.164.655.205.756.346.947.497.95 0.030.110.150.19
2400 1.321.451.762.062.422.803.223.774.294.795.355.916.507.087.618.00 0.030.110.150.19
2500 1.361.491.812.132.502.893.333.894.424.935.506.066.647.217.708.03 0.030.120.160.20
2600 1.401.541.872.192.572.983.434.004.555.065.646.206.777.327.768.02 0.030.120.170.21
2700 1.441.581.922.262.653.063.524.114.675.195.776.336.897.417.817.98 0.030.130.170.22
2800 1.481.631.982.322.723.153.624.224.795.325.906.457.007.487.827.90 0.030.130.180.23
2900 1.521.672.032.382.803.233.724.334.905.436.016.567.097.547.81 0.030.140.190.23
3000 1.561.712.082.452.873.313.814.435.015.556.136.677.177.577.77 0.030.140.190.24
3100 1.601.752.132.512.943.393.904.535.125.656.236.767.237.597.71 0.030.140.200.25
3200 1.631.792.182.563.013.473.984.625.225.756.326.837.287.58 0.040.150.200.26
3300 1.671.832.232.623.083.554.074.725.315.856.416.907.317.56 0.040.150.210.27
3400 1.711.872.282.683.143.624.154.815.405.946.496.967.337.51 0.040.160.220.28
3500 1.741.912.332.743.213.694.234.895.496.026.567.007.337.44 0.040.160.220.28
3600 1.781.952.382.793.273.774.314.975.576.096.627.047.327.34 0.040.170.230.29
3700 1.811.992.422.843.333.834.385.055.656.166.677.067.29 0.040.170.240.30
3800 1.842.022.472.903.393.904.455.135.726.236.717.077.24 0.040.180.240.31
3900 1.872.062.512.953.453.964.525.205.786.286.747.067.17 0.040.180.250.32
4000 1.912.092.553.003.514.034.595.265.856.336.767.047.09 0.050.190.260.32
4100 1.942.132.603.053.564.094.655.325.906.376.787.01 0.050.190.260.33
4200 1.972.162.643.093.614.154.715.385.956.406.786.97 0.050.200.270.34
4300 2.002.192.683.143.674.204.775.445.996.436.776.91 0.050.200.280.35
4400 2.032.232.723.183.724.254.825.496.036.456.756.83 0.050.210.280.36
4500 2.052.262.753.233.764.314.885.536.066.466.736.74 0.050.210.290.36
4600 2.082.292.793.273.814.364.925.586.096.466.68 0.050.220.290.37
4700 2.112.322.833.313.864.404.975.616.116.456.63 0.050.220.300.38
4800 2.132.352.863.353.904.455.015.646.136.446.57 0.050.220.310.39
4900 2.162.372.893.393.944.495.055.676.136.426.50 0.060.230.310.40
5000 2.182.402.933.423.984.535.095.706.136.386.41 0.060.230.320.40
5100 2.212.432.963.464.024.575.125.716.136.34 0.060.240.330.41
5200 2.232.452.993.494.054.605.155.736.126.29 0.060.240.330.42
5300 2.252.483.023.534.094.635.175.746.106.23 0.060.250.340.43
5400 2.282.503.053.564.124.665.205.746.076.17 0.060.250.350.44
5500 2.302.533.073.594.154.695.225.746.046.09 0.060.260.350.45
5600 2.322.553.103.624.184.715.235.736.00 0.060.260.360.45
5700 2.342.573.133.644.204.745.245.725.95 0.060.270.360.46
5800
2.35
2.59
3.15
3.67
4.23
4.75
5.25
5.70
0.07
0.27
0.37
0.47
5900
2.37
2.61
3.17
3.69
4.25
4.77
5.25
5.68
0.07
0.28
0.38
0.48
6000
2.39
2.63
3.19
3.71
4.27
4.78
5.25
0.07
0.28
0.38
0.49
Where v > 40 m/s,
please consult our
Applications
Engineers!
30
O
35
O
v [m/s]
Profile PM
and Lb = 4089 mm
v [m/s]
Table 9
5
O
10
O
20
O
nk
[rpm]
180 190 200 224 250 280 315 355 400 450 500 560 630 710 800 1000
1.01 1.06 1.27 > 1.57
tototo
1.05 1.26 1.57
700
3.51 3.83 4.16 4.93 5.75 6.68 7.74 8.9310.2211.6012.9214.4316.0717.7819.4722.23
0.06 0.24 0.33 0.42
950
4.46 4.88 5.30 6.29 7.34 8.52 9.8511.3112.8614.4815.9717.5819.2020.6521.7421.79
0.08 0.33 0.45 0.56
1450
6.06 6.65 7.22 8.57 9.9611.4713.1114.8016.4317.9018.9719.6619.5718.1614.71
0.12 0.50 0.68 0.86
2850
8.24
8.97
9.64
11.01
12.10
12.77
12.69
11.34
8.03
1.86
0.24
0.98
1.34
1.69
100 0.700.760.810.951.091.261.451.661.902.172.432.743.103.503.954.93 0.010.030.050.06
200 1.251.361.461.721.992.302.663.063.514.004.495.075.736.487.319.10 0.020.070.090.12
300 1.761.912.062.432.823.273.784.365.005.716.407.228.169.22
10.37
12.82 0.020.100.140.18
400 2.232.432.623.103.604.184.845.596.427.328.209.24
10.42
11.73
13.15
16.08 0.030.140.190.24
500 2.672.923.163.734.355.055.866.767.758.839.89
11.12
12.50
14.01
15.62
18.79 0.040.170.230.30
600 3.103.393.674.355.075.886.827.879.02
10.26
11.46
12.85
14.39
16.04
17.74
20.87 0.050.210.280.36
700
3.51 3.83 4.16 4.93 5.75 6.68 7.74 8.9310.2211.6012.9214.4316.0717.7819.4722.23
0.06 0.24 0.33 0.42
800
3.90 4.27 4.63 5.49 6.41 7.44 8.62 9.9211.3412.8314.2515.8317.5119.2020.7522.76
0.07 0.27 0.38 0.48
900
4.27 4.68 5.08 6.03 7.04 8.17 9.4510.8612.3813.9615.4317.0518.7020.2621.5522.37
0.07 0.31 0.42 0.53
1000
4.63 5.07 5.51 6.55 7.64 8.8610.2411.7413.3314.9716.4718.0719.6220.9421.79
0.08 0.34 0.47 0.59
1100
4.98 5.45 5.93 7.04 8.21 9.5110.9712.5514.2015.8717.3518.8620.2221.1921.44
0.09 0.38 0.52 0.65
1200
5.31 5.82 6.32 7.51 8.7510.1211.6513.2814.9716.6318.0519.4220.5020.97
0.10 0.41 0.56 0.71
1300
5.62 6.16 6.70 7.95 9.2610.7012.2813.9515.6417.2518.5719.7220.4220.26
0.11 0.45 0.61 0.77
1400
5.92 6.49 7.05 8.37 9.7311.2312.8514.5316.2017.7318.8919.7519.95
0.12 0.48 0.66 0.83
1500
6.20 6.80 7.39 8.7610.1811.7113.3615.0416.6418.0418.9919.49
0.12 0.51 0.70 0.89
1600
6.47 7.09 7.71 9.1310.5812.1513.8015.4516.9718.1918.8718.91
0.13 0.55 0.75 0.95
1700
6.72 7.36 8.00 9.4710.9612.5414.1815.7817.1718.1618.51
0.14 0.58 0.80 1.01
1800
6.95 7.62 8.27 9.7811.2912.8814.4916.0017.2317.9417.90
0.15 0.62 0.85 1.07
1900
7.16 7.85 8.5210.0611.5813.1614.7316.1317.1517.53
0.16 0.65 0.89 1.13
2000
7.36 8.07 8.7510.3011.8413.3914.8916.1516.9216.91
0.17 0.69 0.94 1.19
2100
7.54
8.26
8.96
10.52
12.05
13.56
14.97
16.06
16.54
0.17
0.72
0.99
1.25
2200
7.70
8.43
9.13
10.71
12.21
13.67
14.97
15.85
16.00
0.18
0.76
1.03
1.31
2300
7.84
8.58
9.29
10.86
12.33
13.72
14.88
15.52
15.29
0.19
0.79
1.08
1.37
2400
7.96
8.70
9.41
10.97
12.41
13.71
14.70
15.07
0.20
0.82
1.13
1.43
2500
8.06
8.81
9.51
11.05
12.43
13.62
14.43
14.48
0.21
0.86
1.17
1.48
2600
8.14
8.88
9.59
11.09
12.40
13.47
14.06
13.76
0.22
0.89
1.22
1.54
2700
8.20
8.94
9.63
11.09
12.32
13.25
13.59
0.22
0.93
1.27
1.60
2800
8.23
8.96
9.64
11.05
12.19
12.95
13.02
0.23
0.96
1.32
1.66
2900
8.24
8.96
9.63
10.97
12.00
12.57
12.34
0.24
1.00
1.36
1.72
3000
8.23
8.93
9.58
10.85
11.75
12.12
0.25
1.03
1.41
1.78
3100
8.19
8.88
9.50
10.68
11.44
11.58
0.26
1.06
1.46
1.84
3200
8.13
8.79
9.38
10.46
11.07
10.96
0.26
1.10
1.50
1.90
Where v > 30 m/s,
please consult our
Applications
Engineers!
v [m/s]
sPecial dRives
v-flaT dRive
The V-flat drive utilises a ribbed belt pulley and a flat faced
pulley. under certain conditions, this type of drive can be
used for drives which are subject to shock loadings or have
high moments of inertia. Because flywheels or flat pulleys are
quite often already fitted, drive costs can be reduced. When
converting a flat belt drive to a V-Flat drive, it is usually
economical to continue to use the large flat pulley.
a = Drive centre distance
[mm]
b = Flat pulley face width
[mm]
b2 = ribbed belt pulley face width
[mm]
Da = Flat pulley outside diameter
[mm]
Dz = Allowance for determining the theoretical
diameter
[mm]
db = Effective diameter of ribbed belt pulley
[mm]
f
= Allowance for determining the flat pulley
face width
[mm]
h
= Crown height per 100 mm of pulley face width
[mm]
i
= Speed ratio
Lbth = Calculated belt effective length
[mm]
31
Special Drives
V-Flat Drive
Calculation of V-Flat Drives
The calculation for a V-flat drive is undertaken in the same
manner as shown on pages 22 to 24. The following important requirements must be checked so as to ensure a reliable
and efficient V-flat drive.
• The small pulley must always be a grooved pulley.
• The V-flat drive is particularly economical when
Da – db
K = lies between 0.5 and 1.15.
a
The ideal drive is achieved when K = 0.85. If the “K” factor
falls outside the recommended range, it is then more economical to use a normal ribbed belt drive with grooved pulleys.
• The following recommendations are made based upon the
above requirements:
Speed ratio
Drive centre
distance
K factor
Da + DZ
i = ≥
3
db + 2 hb
aall ≥ Da
Da – db
a = 0.85
Da – db
K = a
Kall 0.5 to 1.15
• When calculating the number of ribs and the belt tension,
care must be taken to ensure that a special arc of
contact correction factor c1 as detailed in the following table 10 is applied.
Table 10: Arc of Contact Correction Factor c1 (for V-Flat Drives Only)
K =
Da – db
a
c1
β≈
0
180°
0.07
176°
0.15
170°
0.22
167°
0.29
163°
0.35
160°
0.40
156°
0.45
153°
0.50
150°
0.57
146°
0.64
143°
0.70
140°
0.75
137°
0.80
134°
0.85
130°
0.92
125°
1.00
120°
1.07
115°
1.15
110°
1.21
106°
1.30
100°
1.36 96°
1.45 90°
0.75
0.76
0.77
0.79
0.79
0.80
0.81
0.81
0.82
0.83
0.84
0.85
0.85
0.86
0.86
0.84
0.82
0.80
0.78
0.77
0.73
0.72
0.70
The length calculation is for the effective length Lb. Therefore,
in order to obtain the theoretical calculation diameter,
an allowance Dz must be added to the flat pulley outside
diameter.
Table 11: Effective Line Difference hb
Profile
PH
PJ
PK
PL
hb nominal dimension
0.80
1.25
1.60
3.50
5.00
DZ
1.60
2.70
3.50
6.50
11.00
Calculation of the effective length
Lbth ≈ 2 a + 1.57 (db + Da + DZ) +
In addition to the drive design on pages 22 to 24,
the static belt tension for V-flat drives must be
calculated with the adjacent formula.
Formula:
Calculation of the static belt tension
for V-flat drives
500 · (2.25 – c1) · PB
T = + k · v2
c1 · z · v
(Da + DZ – db)2
4a
PM
sPecial dRives
Tension/guide idleRs
Tensioning/guide pulleys are ribbed or flat faced and do not
transmit power within a drive system. Because they create
additional bending stresses within the belt their use should be
restricted to the following applications if possible:
• with fixed drive centres to produce the required belt tension
and to provide for maximum belt stretch and wear
• as damping and guide rollers with long span lengths
• as guide rollers on drives where the pulleys are not all
positioned in one plane
• as movable tensioners, to achieve a constant belt tension.
this results in reduced maintenance and longer service life.
the tension force is normally generated by springs,
pneumatics or hydraulics.
If idler pulleys have to be used for the reasons mentioned
above, the following criteria should be observed in drive
design:
• position of the pulley in the belt span
• diameter
• shape
• the adjustment travel of the pulley, both for tensioning and
retensioning the ribbed belts
• correction of the power rating per rib Pn
idler arrangement
Idlers can be used as inside or outside idlers. the end position of
the idler must be based on the maximum belt stretch assumption.
Flat pulleys, whether used inside or outside should be placed
as far away as possible from the next grooved pulley that the
ribbed belt will run onto. misalignment of the idler and the
pulley due to lateral movements on the flat pulley can largely
be prevented as a result.
If the design conditions do not favour an outside idler, an
inside idler is then generally more advantageous. Inside idler
diameters can be smaller than outside idler diameters.
inside idlers can be either grooved pulleys or flat pulleys.
Inside idlers reduce the arc of contact on the loaded pulleys
and hence also the arc of contact correction factor c1. When
calculating the number of ribs, the arc of contact correction
factor is to be selected at the point of the maximum belt
extension (see table 14, page 34).
ribbed belt pulleys are to be preferred as inside idlers on
long spans as flat pulleys could permit the development of
lateral vibration.
outside idlers must always take the form of flat pulleys as
they run on the top surface of the belt. they increase the arc
of contact. Care must be taken however to ensure that the
maximum possible belt stretch is taken up, and that contact
with the opposite span is prevented.
Inside Idler
the diametrically opposed bending caused when outside
idlers are used can lead to a reduction of the belt service life.
Idlers on the Tight/Slack Side
Both the theoretical power transmission formulae and actual
practice have shown that wherever possible the idler should be
placed on the slack side of the drive. this allows the idler
tension force to be maintained at a considerably lower level.
A spring loaded idler must not be used in a reversing drive
because the tight and slack sides change continuously.
Our engineers will be pleased to advise you about special
problems regarding spring loaded idlers!
Minimum diameter for inside idlers
Inside idler ≥ the smallest driven pulley in the system
Minimum diameter for outside idlers
Outside idler ≥ 1.2 times the smallest loaded pulley in the
system
Table 12: Minimum diameter for idlers
Profile
Ph
PJ
PK
Pl
PM
minimum diameter
of inside idler
[mm]
minimum diameter
of outside idler
[mm]
20
25
50
100
200
40
50
70
150
300
Failure to observe the minimum recommended idler diameter
will impair the service life of the ribbed belts.
idler design
ribbed belt pulleys used as idlers normally have standard
groove dimensions. Flat pulleys should wherever possible be
cylindrical, not crowned.
Outside Idler
33
sPecial dRives
Tension/guide idleRs
drive calculation
the length calculation and the determination of the number of
ribs is undertaken as for two-pulley drives. Certain details
must, however, be taken into account:
1. Calculate the ribbed belt length over two pulleys using the
formula:
Lbth ≈ 2 a + 1.57 (dbg + dbk) +
(dbg – dbk)2
the nominal power rating Pn per rib is as previously based
on the smallest loaded pulley.
In determining the arc of contact correction factor c1 the
smallest contact angle of the loaded pulleys which
occurs at maximum belt extension must be used.
Table 14: Arc of Contact Correction Factor c1
β≈
c1
β≈
c1
75°
80°
85°
90°
95°
0.78
0.82
0.84
0.85
0.87
175°
180°
185°
190°
195°
1.00
1.00
1.00
1.01
1.01
100°
105°
110°
115°
120°
0.89
0.90
0.91
0.92
0.93
200°
205°
210°
215°
220°
1.01
1.01
1.01
1.02
1.02
125°
130°
135°
140°
145°
0.94
0.95
0.96
0.97
0.97
225°
230°
240°
250°
1.02
1.02
1.02
1.02
150°
155°
160°
165°
170°
0.98
0.98
0.99
0.99
0.99
4a
2. If the ribbed belt has to be fitted with a fixed drive centre
distance, twice the allowance y should be added to the
belt length Lbth (see table 3, page 19).
Lb = Lbth + 2 y
3. the next longest standard length LbSt should then be
selected.
A check should be made to determine whether the belt
can be adequately tensioned with the idler in the outermost position. In this idler position, both the standard
length LbSt as well as double the allowance x must be
taken up (see table 3, page 19).
Lb for idler end position = LbSt + 2 x
Position of the tension pulley
after maximum
belt stretch
at nominal
belt length
the following formula for determining the number of ribs is
obtained using the idler correction factor c4:
z=
fixed drive centre distance
number of idlers
the application of idlers increases the bending stress in the
ribbed belts. to avoid a reduction in belt service life, the idler
correction factor c4 must also be included in the calculation.
this correction factor takes the number of idlers into consideration with the minimum diameter being maintained.
Table 13
34
number of idlers
c4
0
1
2
3
1.00
0.91
0.86
0.81
P · c2
Pn · c1 · c3 · c4
Ribbed belT Pulleys
MeasuRing Pulleys – lengTh MeasuRing condiTions
To din 7867 / iso 9982
Table 15
Profile
Effective
circumference
ub
= db · π
[mm]
Effective
diameter
Groove
angle
db
α
± 0.5°
Checking
rod
diameter
ds
± 0.01
[mm]
Diameter
over
rod
P
± 0.1
[mm]
Groove
depth
tmin
rt min
measuring
force
per rib
Q
[mm]
[mm]
[n]
Ph∗
100
31.8
40°
1.0
31.94
1.33
0.15
30
Ph
300
95.5
40°
1.0
95.60
1.33
0.15
30
PJ∗
100
31.8
40°
1.5
32.06
2.06
0.20
50
PJ
300
95.5
40°
1.5
95.72
2.06
0.20
50
PK
300
95.5
40°
2.5
96.48
3.45
0.25
100
Pl
500
159.2
40°
3.5
161.51
4.92
0.40
200
PM
800
254.6
40°
7.0
259.17
10.03
0.75
450
∗These values apply only for effective lengths under 457 mm.
the appropriate manufacturing tolerances for the grooves
and dimensions of the measuring pulleys are given in tables
15 and 16. Care must be taken to monitor wear or damage.
Other diameters may be used for the measuring pulleys
providing the groove dimensions from the tables are used.
Method of Measuring Ribbed belt effective length
Measuring of Ribbed belt length
the belt is placed over two identical measuring pulleys with
a groove configuration as shown in the adjoining figure.
A load is applied to the moveable pulley until the measuring
force Q is exerted on the ribbed belt. the ribbed belt should
be rotated at least three revolutions before measuring the
drive centre distance a. Only then is the belt settled properly
into the pulley grooves and exact measurements are possible.
the effective length is the result of twice the centre distance a
plus the effective circumference of the measuring pulley.
Lb = 2 a + Ub
measuring force Q [n]
35
Ribbed belT Pulleys
diMensions To din 7867 / iso 9982
Table 16
Profile
Effective
diameter
db min
[mm]
Groove
angle
α
± 0.5°
Groove
pitch
e
(mm)
Σ e ± 0.3
[mm]
Groove
depth
tmin
[mm]
fmin
[mm]
hb
[mm]
rt min
[mm]
rb max
[mm]
2 hs
[mm]
2 δmax
[mm]
Ph
13
40°
1.60
(± 0.03)
(z – 1) 1.60
1.33
1.3
0.80
0.15
0.30
0.11
0.69
PJ
20
40°
2.34
(± 0.03)
(z – 1) 2.34
2.06
1.8
1.25
0.20
0.40
0.23
0.81
PK
45
40°
3.56
(± 0.05)
(z – 1) 3.56
3.45
2.5
1.60
0.25
0.50
0.99
1.68
Pl
75
40°
4.70
(± 0.05)
(z – 1) 4.70
4.92
3.3
3.50
0.40
0.40
2.36
3.50
180
40°
9.40
(± 0.08)
(z – 1) 9.40
10.03
6.4
5.00
0.75
0.75
4.53
5.92
PM
the diameter da may be reduced by the dimension 2 δ – 2 hs at the manufacturer’s discretion.
the arc with radius rt must have an angle of at least 30° and merge tangentially with the edge of the groove.
Manufacture
Pulleys for optibelt RB ribbed belts are made to your specification. Cutting tools for ribbed belt pulleys are available on
special request.
Pulley face width b2
b2 = e (z – 1) + 2 f
the difference between the diameters, measured as distance
p, between the outer tangential plane of the test pin in all the
grooves of a pulley must not exceed the value given in
table 17.
Table 17: Groove to Groove Diameter Variation
tolerance for
no. of grooves [mm]
Pulley
effective
diameter
[mm]
≤ 6 grooves
≤ 10 grooves
Allowance
for each
extra groove
[mm]
≤ 74
0.10
—
0.003
> 74 ≤ 500
—
0.15
0.005
> 500
—
0.25
0.010
Material
All conventional easily machined material may be used,
preferably steel, cast iron, aluminium alloy, brass or high
strength plastics.
surface finish
Groove surface should have a maximum roughness
rz ≤ 3.2 μm and must be free from surface defects.
balancing
For velocities < 30 m/s static balancing is sufficient. Dynamic balancing is necessary for velocities of ≥ 30 m/s.
36
Table 18: Run Out Tolerance
Effective diameter db
[mm]
run out tolerance tr
≤ 74
0.13
> 74 ≤ 250
0.25
> 250
0.25 + 0.0004 per mm
effective diameter above 250
side wobble Tolerance
the side wobble tolerance tp is 0.002 mm for each mm
effective diameter.
Pitch diameter
the schematic illustration shows the seating of a ribbed belt
in the pulley.
Position of the tension cord
(effective line)
Ribbed Belt Pulleys
Standard Range optibelt TB Taper Bushes Taper bushes with metric bores and keyways to DIN 6885 part 1
Taper Bush
Material: EN-GJL-200 – DIN EN 1561
1008 1108 1210 1215 1310 1610 1615 2012 2517 3020 3030 3525 3535 4040 4545 5050
Bore
diameter d2
[mm]
Hexagon socket screws
[inch]
Torque [Nm]
10 10 11 11 14 14 14 14
11 11 12 12 16 16 16 16
12 12 14 14 18 18 18 18
14 14 16 16 19 19 19 19
15 15 18 18 20 20 20 20
16 16 19 19 22 22 22 22
18 18 20 20 24 24 24 24
19 19 22 22 25 25 25 25
20 20 24 24 28 28 28 28
22 22 25 25 30 30 30 30
24  24 28 28 32 32 32 32
25 25 30 30 35 35 35 35
28 32 32 38 38 38
40 40 40
42 42 42
45
48
50
16 25 35 35 35 40 55
18 28 38 38 38 42 60
19 30 40 40 40 45 65
20 32 42 42 42 48 70
22 35 45 45 45 50 75
24 38 48 48 48 55 80
25 40 50 50 50 60 85
28 42 55 55 55 65 90
30 45 60 60 60 70 95
32 48 65 65 65 75 100
35 50 70 70 70 80 105
38 55 75 75 75 85 110
40 60 80 80 90
42 65 85 85 95
45 70 90 90 100
48 75
50
55
60
70
75
80
85
90
95
100
105
110
115
120
125
1/ x 1/ 1/ x 1/ 3/ x 5/ 3/ x 5/ 3/ x 5/ 3/ x 5/ 3/ x 5/ 7/ x 7/ 1/ x 1 5/ x 11/ 5/ x 11/ 1/ x 11/ 1/ x 11/ 5/ x 13/ 3/ x 2 7/ x 21/
4
2
4
2
8
8
8
8
8
8
8
8
8
8 16
8
2
8
4 8
4 2
2 2
2 8
4
4
8
4
5.7
5.7
20
20
20
20
20
31
49
92
92
115
115
172
195
275
Bush length [mm]
22.3 22.3 25.4 38.1 25.4 25.4 38.1 31.8 44.5 50.8 76.2 63.5 88.9 101.6 114.3 127.0
Weight with d2 min [≈ kg]
0.12 0.16 0.28 0.39 0.32 0.41 0.60 0.75 1.06 2.50 3.75 3.90 5.13 7.68 12.70 15.17
Over 3525: Cap head screw with hexagon socket 
This bore has a flat keyway.
Flat Keyway for Taper Bushes
Bore diameter
d2 [mm]
Keyway width
b [mm]
Keyway depth
t2 [mm]
Bore diameter
d2 [mm]
Keyway width
b [mm]
Keyway depth
t2 [mm]
24
25
8
8
2.0
1.3
28
42
8
12
2.0
2.2
Taper bushes with inch bores and keyway to British Standard BS 46 part 1
Material: EN-GJL-200 – DIN EN 1561
Taper Bush
1008 1108 1210 1215 1310 1610 1615 2012 2517 3020 3030 3525 3535 4040 4545 5050
Bore
diameter d2
[inch]
Hexagon socket screws
[inch]
Torque [Nm]
5/8* 1/2*
1/2
1/2
5/8* 3/4
3/8* 3/8* 1/2
11/4 11/4 11/2 11/2 13/4* 21/4* 3*
1
1
5
3
5
5
5
3
7
/2
/2
/8
/4
/8*
/8
/8
/4
/8 13/8 13/8 15/8 15/8 17/8* 23/8* 31/4*
5/8
3/4
7/8
3/4*
3/4
3/4
7/8
5/8
111/2 11/2 13/4 13/4 2* 21/2* 31/2*
3/4
7/8
7/8*
7/8
7/8*
3/4
1
1
11/815/8 15/8 17/8 17/8 21/8* 23/4* 33/4*
7/8
7/8
111/8 1* 1 111/8 11/4 13/4* 13/4* 2
2 21/4* 27/8*4*
1
1
1
1
1
1
3
7
7
1
1

1 11 /8 1 /4 1 /8 1 /8 1 /8 1 /4 1 /8 1 /8 1 /8 2 /8 2 /8 23/8* 3*41/4*
11/8* 11/4
11/4 11/4 11/4 13/8 11/2 2
2 21/4 21/4 21/2* 31/4*41/2*
3
3
3
1
5
1
1
1 /8 1 /8 1 /8 1 /2 1 /8 2 /8* 2 /8* 23/8 23/8 25/8* 33/8*43/4*
11/2 11/2 15/8 13/4 21/4 21/4 21/2 21/2 23/4* 31/2* 5*
15/8 15/8* 13/4 17/8 23/8 23/8 25/8 25/8 27/8* 33/4*
17/8 2 21/2 21/2 23/4 23/43* 4*
2 21/8 25/8 25/8* 27/8 27/8 31/8* 41/4*
21/4 23/4 23/4* 3 331/4* 41/2*
23/8 27/8 27/8 31/8 31/8 33/8*
21/2
3 331/4 31/4 31/2*
33/8 33/8 33/4*
31/2 31/24*
1/ x 1/ 1/ x 1/ 3/ x 5/ 3/ x 5/ 3/ x 5/ 3/ x 5/ 3/ x 5/ 7/ x 7/ 1/ x 1 5/ x 11/ 5/ x 11/ 1/ x 11/ 1/ x 11/ 5/ x 13/ 3/ x 2 7/ x 21/
4
2
4
2
8
8
8
8
8
8
8
8
8
8 16
8
2
8
4 8
4 2
2 2
2 8
4
4
8
4
5.7
5.7
20
20
20
20
20
31
49
92
92
115
115
172
195
275
Bush length [mm]
22.3 22.3 25.4 38.1 25.4 25.4 38.1 31.8 44.5 50.8 76.2 63.5 88.9 101.6 114.3 127.0
Weight with d2 min [≈ kg]
0.12 0.16 0.28 0.39 0.32 0.41 0.60 0.75 1.06 2.50 3.75 3.90 5.13 7.68 12.70 15.17
Over 3525: Cap head screw with hexagon socket * Non-standard items  This bore has a flat keyway.
Ribbed Belt Pulleys
for Taper Bushes, Profile PJ
Type 1
Designation
No. of
grooves
Pulley
type
Material
db
[mm]
b2
[mm]
B
[mm]
N
[mm]
D
[mm]
TB
TB
TB
TB
TB
4
4
4
4
4
PJ
PJ
PJ
PJ
PJ
47.5
52.5
57.5
62.5
67.5
4
4
4
4
4
1
1
1
1
1
GG
GG
GG
GG
GG
47.5
52.5
57.5
62.5
67.5
13
13
13
13
13
23
23
23
23
23
23
23
23
23
23
47.5
47.5
54.0
54.0
54.0
1008
1008
1108
1108
1108
TB
TB
TB
TB
TB
4
4
4
4
4
PJ
PJ
PJ
PJ
PJ
72.5
77.5
82.5
87.5
92.5
4
4
4
4
4
1
1
1
1
1
GG
GG
GG
GG
GG
72.5
77.5
82.5
87.5
92.5
13
13
13
13
13
23
26
26
26
26
23
26
26
26
26
54.0
70.0
78.0
78.0
78.0
1108
1210
1210
1210
1210
TB
TB
TB
TB
TB
4
4
4
4
4
PJ
PJ
PJ
PJ
PJ
97.5
102.5
107.5
112.5
117.5
4
4
4
4
4
1
1
1
1
1
GG
GG
GG
GG
GG
97.5
102.5
107.5
112.5
117.5
13
13
13
13
13
26
26
26
26
26
26
26
26
26
26
78.0
85.0
85.0
85.0
85.0
1210
1610
1610
1610
1610
TB
TB
TB
TB
TB
4
4
4
4
4
PJ
PJ
PJ
PJ
PJ
122.5
127.5
137.5
152.5
162.5
4
4
4
4
4
1
1
1
1
1
GG
GG
GG
GG
GG
122.5
127.5
137.5
152.5
162.5
13
13
13
13
13
26
26
26
26
26
26
26
26
26
26
85.0
85.0
85.0
85.0
85.0
1610
1610
1610
1610
1610
TB
TB
TB
TB
TB
4
4
4
4
4
PJ
PJ
PJ
PJ
PJ
172.5
182.5
192.5
202.5
222.5
4
4
4
4
4
1
1
1
1
1
GG
GG
GG
GG
GG
172.5
182.5
192.5
202.5
222.5
13
13
13
13
13
26
26
26
33
33
26
26
26
33
33
85.0
85.0
85.0
100.0
100.0
1610
1610
1610
2012
2012
Taper bush
1008
1108
1210
1610
2012
Bore d2 [mm] from ... to ...
10-25
10-28
11-32
14-42
14-50
38 Taper
bush
GG= Cast iron
Further sizes upon request.
We reserve to alter specifications without notice.
Bore diameters d2 see page 37.
Ribbed Belt Pulleys
Type 1
Designation
Type 4
No. of
grooves
Pulley
type
Material
db
[mm]
b2
[mm]
B
[mm]
N
[mm]
D
[mm]
Taper
bush
TB
TB
TB
TB
TB
8
8
8
8
8
PJ
PJ
PJ
PJ
PJ
47.5
52.5
57.5
62.5
67.5
8
8
8
8
8
4
4
4
4
4
GG
GG
GG
GG
GG
47.5
52.5
57.5
62.5
67.5
23
23
23
23
23
23
23
23
23
23
23
23
23
23
23
— — — — — 1008
1008
1108
1108
1108
TB
TB
TB
TB
TB
8
8
8
8
8
PJ
PJ
PJ
PJ
PJ
72.5
77.5
82.5
87.5
92.5
8
8
8
8
8
4
1
1
1
1
GG
GG
GG
GG
GG
72.5
77.5
82.5
87.5
92.5
23
23
23
23
23
23
26
26
26
26
23
26
26
26
26
— 70.0
78.0
78.0
78.0
1108
1210
1210
1210
1210
TB
TB
TB
TB
TB
8
8
8
8
8
PJ
PJ
PJ
PJ
PJ
97.5
102.5
107.5
112.5
117.5
8
8
8
8
8
1
1
1
1
1
GG
GG
GG
GG
GG
97.5
102.5
107.5
112.5
117.5
23
23
23
23
23
26
26
26
26
26
26
26
26
26
26
78.0
85.0
85.0
85.0
85.0
1210
1610
1610
1610
1610
TB
TB
TB
TB
TB
8
8
8
8
8
PJ
PJ
PJ
PJ
PJ
122.5
127.5
137.5
152.5
162.5
8
8
8
8
8
1
1
1
1
1
GG
GG
GG
GG
GG
122.5
127.5
137.5
152.5
162.5
23
23
23
23
23
26
26
26
26
26
26
26
26
26
26
85.0
85.0
85.0
85.0
85.0
1610
1610
1610
1610
1610
TB
TB
TB
TB
TB
8
8
8
8
8
PJ
PJ
PJ
PJ
PJ
172.5
182.5
192.5
202.5
222.5
8
8
8
8
8
1
1
1
1
1
GG
GG
GG
GG
GG
172.5
182.5
192.5
202.5
222.5
23
23
23
23
23
26
26
26
33
33
26
26
26
33
33
85.0
85.0
85.0
100.0
100.0
1610
1610
1610
2012
2012
Taper bush
1008
1108
1210
1610
2012
10-25
10-28
11-32
14-42
14-50
GG = Cast iron
Ribbed Belt Pulleys
Type 1
Designation
Type 2
No. of
grooves
Pulley
type
Material
db
[mm]
b2
[mm]
B
[mm]
N
[mm]
D
[mm]
Taper
bush
TB
TB
TB
TB
TB
12
12
12
12
12
PJ
PJ
PJ
PJ
PJ
62.5
67.5
72.5
77.5
82.5
12
12
12
12
12
2
2
2
2
2
GG
GG
GG
GG
GG
62.5
67.5
72.5
77.5
82.5
32
32
32
32
32
32
32
32
32
32
23
23
23
26
26
50.0
50.0
50.0
62.0
62.0
1108
1108
1108
1210
1210
TB
TB
TB
TB
TB
12
12
12
12
12
PJ
PJ
PJ
PJ
PJ
87.5
92.5
97.5
102.5
107.5
12
12
12
12
12
2
2
2
2
2
GG
GG
GG
GG
GG
87.5
92.5
97.5
102.5
107.5
32
32
32
32
32
32
32
32
32
32
26
26
26
26
26
70.0
70.0
70.0
70.0
70.0
1610
1610
1610
1610
1610
TB
TB
TB
TB
TB
12
12
12
12
12
PJ
PJ
PJ
PJ
PJ
112.5
117.5
122.5
127.5
137.5
12
12
12
12
12
2
2
2
1
1
GG
GG
GG
GG
GG
112.5
117.5
122.5
127.5
137.5
32
32
32
32
32
32
32
32
32
32
26
26
26
33
33
70.0
70.0
70.0
100.0
100.0
1610
1610
1610
2012
2012
TB
TB
TB
TB
TB
12
12
12
12
12
PJ
PJ
PJ
PJ
PJ
152.5
162.5
172.5
182.5
192.5
12
12
12
12
12
1
1
1
1
1
GG
GG
GG
GG
GG
152.5
162.5
172.5
182.5
192.5
32
32
32
32
32
32
32
32
46
46
33
33
33
46
46
100.0
100.0
100.0
110.0
110.0
2012
2012
2012
2517
2517
TB 12 PJ 202.5
TB 12 PJ 222.5
12
12
1
1
GG
GG
202.5
222.5
32
32
46
46
46
46
110.0
110.0
2517
2517
Taper bush
1108
1210
1610
2012
2517
10-28
11-32
14-42
14-50
16-60
GG = Cast iron
Ribbed Belt Pulleys
Type 1
Designation
Type 2
No. of
grooves
Pulley
type
Material
db
[mm]
b2
[mm]
B
[mm]
N
[mm]
D
[mm]
Taper
bush
TB
TB
TB
TB
TB
16
16
16
16
16
PJ
PJ
PJ
PJ
PJ
62.5
67.5
72.5
77.5
82.5
16
16
16
16
16
2
2
2
2
2
GG
GG
GG
GG
GG
62.5
67.5
72.5
77.5
82.5
41
41
41
41
41
41
41
41
41
41
23
23
26
26
26
50.0
50.0
62.0
62.0
62.0
1108
1108
1210
1210
1210
TB
TB
TB
TB
TB
16
16
16
16
16
PJ
PJ
PJ
PJ
PJ
87.5
92.5
97.5
102.5
107.5
16
16
16
16
16
2
2
2
2
2
GG
GG
GG
GG
GG
87.5
92.5
97.5
102.5
107.5
41
41
41
41
41
41
41
41
41
41
26
26
26
26
26
70.0
70.0
70.0
70.0
70.0
1610
1610
1610
1610
1610
TB
TB
TB
TB
TB
16
16
16
16
16
PJ
PJ
PJ
PJ
PJ
112.5
117.5
122.5
127.5
137.5
16
16
16
16
16
2
2
2
2
2
GG
GG
GG
GG
GG
112.5
117.5
122.5
127.5
137.5
41
41
41
41
41
41
41
41
41
41
33
33
33
33
33
85.0
85.0
85.0
85.0
85.0
2012
2012
2012
2012
2012
TB
TB
TB
TB
TB
16
16
16
16
16
PJ
PJ
PJ
PJ
PJ
152.5
162.5
172.5
182.5
192.5
16
16
16
16
16
2
2
2
1
1
GG
GG
GG
GG
GG
152.5
162.5
172.5
182.5
192.5
41
41
41
41
41
41
41
41
46
46
33
33
33
46
46
85.0
85.0
85.0
110.0
110.0
2012
2012
2012
2517
2517
TB 16 PJ 202.5
TB 16 PJ 222.5
16
16
1
1
GG
GG
202.5
222.5
41
41
46
46
46
46
110.0
110.0
2517
2517
Taper bush
1108
1210
1610
2012
2517
10-28
11-32
14-42
14-50
16-60
GG = Cast iron
Ribbed Belt Pulleys
for Taper Bushes, Profile PL
Type 1
Type 2
b2
[mm]
B
[mm]
N
[mm]
78
83
88
93
98
33
33
33
33
33
33
33
33
33
33
26 62.0
26 62.0
26 70.0
26 70.0
26 70.0
1210
1210
1610
1610
1610
GG
GG
GG
GG
GG
103
108
113
118
123
33
33
33
33
33
33
33
33
33
33
26
26
26
26
33
70.0
70.0
70.0
70.0
—
1610
1610
1610
1610
2012
4
4
4
4
1
GG
GG
GG
GG
GG
133
148
158
168
178
33
33
33
33
33
33
33
33
33
46
33
33
33
33
46
—
—
—
—
110.0
2012
2012
2012
2012
2517
6
6
6
6
6
1
1
1
1
1
GG
GG
GG
GG
GG
188
198
218
238
258
33
33
33
33
33
46
46
46
46
46
46
46
46
46
46
110.0
110.0
110.0
110.0
110.0
2517
2517
2517
2517
2517
6
6
6
6
6
1
1
1
1
1
GG
GG
GG
GG
GG
278
298
318
348
388
33
33
33
33
33
46
46
46
46
46
46
46
46
46
46
110.0
110.0
110.0
110.0
110.0
2517
2517
2517
2517
2517
Designation
No. of
grooves
Pulley
type
Material
TB 6 PL 78
TB 6 PL 83
TB 6 PL 88
TB 6 PL 93
TB 6 PL 98
6
6
6
6
6
2
2
2
2
2
GG
GG
GG
GG
GG
TB 6 PL 103
TB 6 PL 108
TB 6 PL 113
TB 6 PL 118
TB 6 PL 123
6
6
6
6
6
2
2
2
2
4
TB
TB
TB
TB
TB
133
148
158
168
178
6
6
6
6
6
TB 6 PL 188
TB 6 PL 198
TB 6 PL 218
TB 6 PL 238
TB 6 PL 258
TB 6 PL 278
TB 6 PL 298
TB 6 PL 318
TB 6 PL 348
TB 6 PL 388
6
6
6
6
6
PL
PL
PL
PL
PL
Type 4
db
[mm]
Taper bush
1210
1610
2012
2517
11-32
14-42
14-50
16-60
D
[mm]
Taper
bush
GG = Cast iron
Ribbed Belt Pulleys
Type 1
Designation
Type 2
No. of
grooves
Pulley
type
Material
db
[mm]
b2
[mm]
B
[mm]
N
[mm]
D
[mm]
Taper
bush
TB
TB
TB
TB
TB
8
8
8
8
8
PL
PL
PL
PL
PL
78
83
88
93
98
8
8
8
8
8
2
2
2
2
2
GG
GG
GG
GG
GG
78
83
88
93
98
42
42
42
42
42
42
42
42
42
42
26
26
26
26
26
62.0
62.0
70.0
70.0
70.0
1210
1210
1610
1610
1610
TB
TB
TB
TB
TB
8
8
8
8
8
PL
PL
PL
PL
PL
103
108
113
118
123
8
8
8
8
8
2
2
2
2
2
GG
GG
GG
GG
GG
103
108
113
118
123
42
42
42
42
42
42
42
42
42
42
33
33
33
33
33
85.0
85.0
85.0
85.0
85.0
2012
2012
2012
2012
2012
TB
TB
TB
TB
TB
8
8
8
8
8
PL
PL
PL
PL
PL
133
148
158
168
178
8
8
8
8
8
2
2
2
2
1
GG
GG
GG
GG
GG
133
148
158
168
178
42
42
42
42
42
42
42
42
42
46
33
33
33
33
46
85.0
85.0
85.0
85.0
110.0
2012
2012
2012
2012
2517
TB
TB
TB
TB
TB
8
8
8
8
8
PL
PL
PL
PL
PL
188
198
218
238
258
8
8
8
8
8
1
1
1
1
1
GG
GG
GG
GG
GG
188
198
218
238
258
42
42
42
42
42
46
46
46
46
46
46
46
46
46
46
110.0
110.0
110.0
110.0
110.0
2517
2517
2517
2517
2517
TB
TB
TB
TB
TB
8
8
8
8
8
PL
PL
PL
PL
PL
278
298
318
348
388
8
8
8
8
8
1
1
1
1
1
GG
GG
GG
GG
GG
278
298
318
348
388
42
42
42
42
42
46
46
46
46
46
46
46
46
46
46
110.0
110.0
110.0
110.0
110.0
2517
2517
2517
2517
2517
Taper bush
1210
1610
2012
2517
11-32
14-42
14-50
16-60
GG = Cast iron
Ribbed Belt Pulleys
Type 2
Designation
Type 3
No. of
grooves
Pulley
type
Material
db
[mm]
b2
[mm]
B
[mm]
N
[mm]
D
[mm]
TB
TB
TB
TB
TB
10
10
10
10
10
PL
PL
PL
PL
PL
88
93
98
103
108
10
10
10
10
10
3
3
3
2
2
GG
GG
GG
GG
GG
88
93
98
103
108
53
53
53
53
53
53
53
53
53
53
26
26
26
33
33
70.0
70.0
70.0
85.0
85.0
1610
1610
1610
2012
2012
TB
TB
TB
TB
TB
10
10
10
10
10
PL
PL
PL
PL
PL
113
118
123
133
148
10
10
10
10
10
2
2
2
2
2
GG
GG
GG
GG
GG
113
118
123
133
148
53
53
53
53
53
53
53
53
53
53
33
33
33
33
33
85.0
85.0
85.0
85.0
85.0
2012
2012
2012
2012
2012
TB
TB
TB
TB
TB
10
10
10
10
10
PL
PL
PL
PL
PL
158
168
178
188
198
10
10
10
10
10
2
2
2
2
2
GG
GG
GG
GG
GG
158
168
178
188
198
53
53
53
53
53
53
53
53
53
53
33
33
46
46
46
85.0
85.0
105.0
105.0
105.0
2012
2012
2517
2517
2517
TB
TB
TB
TB
TB
10
10
10
10
10
PL
PL
PL
PL
PL
218
238
258
278
298
10
10
10
10
10
2
2
2
2
2
GG
GG
GG
GG
GG
218
238
258
278
298
53
53
53
53
53
53
53
53
53
53
46
46
46
46
46
105.0
105.0
105.0
105.0
105.0
2517
2517
2517
2517
2517
TB 10 PL 318
TB 10 PL 348
TB 10 PL 388
10
10
10
2
2
2
GG
GG
GG
318
348
388
53
53
53
53
53
53
46
46
46
105.0
105.0
105.0
2517
2517
2517
Taper bush
1610
2012
2517
14-42
14-50
16-60
44 Taper
bush
GG = Cast iron
Ribbed Belt Pulleys
Type 2
Designation
Type 3
No. of
grooves
Pulley
type
Material
db
[mm]
b2
[mm]
B
[mm]
N
[mm]
D
[mm]
Taper
bush
TB
TB
TB
TB
TB
12
12
12
12
12
PL
PL
PL
PL
PL
88
93
98
103
108
12
12
12
12
12
3
3
3
3
3
GG
GG
GG
GG
GG
88
93
98
103
108
62
62
62
62
62
62
62
62
62
62
26
26
26
33
33
70.0
70.0
70.0
85.0
85.0
1610
1610
1610
2012
2012
TB
TB
TB
TB
TB
12
12
12
12
12
PL
PL
PL
PL
PL
113
118
123
133
148
12
12
12
12
12
3
3
3
3
2
GG
GG
GG
GG
GG
113
118
123
133
148
62
62
62
62
62
62
62
62
62
62
33
33
33
33
46
85.0
85.0
85.0
85.0
105.0
2012
2012
2012
2012
2517
TB
TB
TB
TB
TB
12
12
12
12
12
PL
PL
PL
PL
PL
158
168
178
188
198
12
12
12
12
12
2
2
2
2
2
GG
GG
GG
GG
GG
158
168
178
188
198
62
62
62
62
62
62
62
62
62
62
46
46
46
46
46
105.0
105.0
105.0
105.0
105.0
2517
2517
2517
2517
2517
TB
TB
TB
TB
TB
12
12
12
12
12
PL
PL
PL
PL
PL
218
238
258
278
298
12
12
12
12
12
2
2
2
2
2
GG
GG
GG
GG
GG
218
238
258
278
298
62
62
62
62
62
62
62
62
62
62
46
52
52
52
52
105.0
130.0
130.0
130.0
130.0
2517
3020
3020
3020
3020
TB 12 PL 318
TB 12 PL 348
TB 12 PL 388
12
12
12
2
2
2
GG
GG
GG
318
348
388
62
62
62
62
62
62
52
52
52
130.0
130.0
130.0
3020
3020
3020
Taper bush
1610
2012
2557
3020
14-42
14-50
16-60
25-75
GG = Cast iron
Bore diameter d2 see page 37.
Ribbed Belt Pulleys
Type 3
Designation
No. of
grooves
Pulley
type
Material
db
[mm]
b2
[mm]
B
[mm]
N
[mm]
D
[mm]
TB
TB
TB
TB
TB
16
16
16
16
16
PL
PL
PL
PL
PL
103
108
113
118
123
16
16
16
16
16
3
3
3
3
3
GG
GG
GG
GG
GG
103
108
113
118
123
80
80
80
80
80
80
80
80
80
80
33
33
33
33
33
85.0
85.0
85.0
85.0
85.0
2012
2012
2012
2012
2012
TB
TB
TB
TB
TB
16
16
16
16
16
PL
PL
PL
PL
PL
133
148
158
168
178
16
16
16
16
16
3
3
3
3
3
GG
GG
GG
GG
GG
133
148
158
168
178
80
80
80
80
80
80
80
80
80
80
33
46
46
46
46
85.0
105.0
105.0
105.0
105.0
2012
2517
2517
2517
2517
TB
TB
TB
TB
TB
16
16
16
16
16
PL
PL
PL
PL
PL
188
198
218
238
258
16
16
16
16
16
3
3
3
3
3
GG
GG
GG
GG
GG
188
198
218
238
258
80
80
80
80
80
80
80
80
80
80
46
46
46
52
52
105.0
105.0
105.0
130.0
130.0
2517
2517
2517
3020
3020
TB
TB
TB
TB
TB
16
16
16
16
16
PL
PL
PL
PL
PL
278
298
318
348
388
16
16
16
16
16
3
3
3
3
3
GG
GG
GG
GG
GG
278
298
318
348
388
80
80
80
80
80
80
80
80
80
80
52
52
52
52
52
130.0
130.0
130.0
130.0
130.0
3020
3020
3020
3020
3020
Taper bush
2012
2557
3020
14-50
16-60
25-75
46 Taper
bush
GG = Cast iron
Ribbed Belt Pulleys
for Cylindrical Bore, Profile PJ
Type VB (for cylindrical bore)
Pulley
type
Material
db
[mm]
b1
[mm]
B
[mm]
D
[mm]
Pilot
bore
d
[mm]
Finished
bore
dmax
[mm]
Weight
[≈ kg]
4 PJ 22.5 4
4 PJ 27.5 4
4 PJ 32.5 4
4 PJ 37.5 4
4 PJ 42.5 4
VB
VB
VB
VB
VB
GG
GG
GG
GG
GG
22.5
27.5
32.5
37.5
42.5
13
13
13
13
13
20
20
20
20
20
25
30
35
40
45
8
8
8
8
8
12.0
14.0
18.0
20.0
22.0
0.045
0.070
0.100
0.135
0.180
8 PJ 22.5 8
8 PJ 27.5 8
8 PJ 32.5 8
8 PJ 37.5 8
8 PJ 42.5 8
VB
VB
VB
VB
VB
GG
GG
GG
GG
GG
22.5
27.5
32.5
37.5
42.5
23
23
23
23
23
30
30
30
30
30
25
30
35
40
45
8
8
8
8
8
12.0
14.0
18.0
20.0
22.0
0.063
0.100
0.150
0.200
0.265
12 PJ 22.5
12 PJ 27.5
12 PJ 32.5
12 PJ 37.5
12 PJ 42.5
VB
VB
VB
VB
VB
GG
GG
GG
GG
GG
22.5
27.5
32.5
37.5
42.5
32
32
32
32
32
40
40
40
40
40
25
30
35
40
45
8
8
8
8
8
12.0
14.0
18.0
20.0
22.0
0.086
0.140
0.200
0.280
0.360
Designation
No. of
grooves
12
12
12
12
12
GG = Cast iron
design hinTs
Ribbed belT Tension
the correct level of belt tension is of great importance for
trouble free transmission of power, and for the achievement of
an acceptable belt service life. Often, tension which is either
too high or too low results in early belt failure. A belt which is
over tensioned sometimes causes bearing failure in the driver
or driven unit.
It has been shown that the more common tensioning instructions – e. g. using the “thumb pressure deflection method” –
do not result in tension being obtained which would enable
drives to be operated at optimum efficiency. It is therefore
recommended that the required static belt tension “T” be
calculated individually for every drive using the following
OPtIBELt formulae. the best initial tension is the absolute
minimum for a drive which permits the highest level of power
transmission under consideration of the normal slip.
Once the ribbed belt has been fitted and the calculated shaft
load applied, the tension should be checked, using our
OPtIBELt tension gauge.
The belt should be observed regularly during the first few
hours of service. Experience indicates that the first re-tensioning should be undertaken after running at full load for 0.5 to
4 hours to take up the initial belt stretch.
After approximately 24 hours’ running, especially if the belt
has not run continuously under full load conditions, the drive
should be checked and, if necessary, re-tensioned. After this,
maintenance intervals for the drive can then be increased
considerably. In addition, our installation and maintenance
instructions should be observed.
Over- or undertensioning of the drive will be avoided if the
belt tension is calculated, set and checked by one of the
following methods:
I. Checking the Belt Tension by Span Deflection
this method provides an indirect measurement of the calculated or actual static belt tension.
E = Belt deflection per 100 mm span length
[mm]
Ea = Belt deflection for a given span length
[mm]
f = Load used to set belt tension per rib
[n]
k =
L =
Sa =
t =
Constant for calculation of centrifugal force
Span length
minimum static shaft loading
minimum static belt tension per rib
1. Calculate the static belt tension using the following
formula:
500 · (2.03 – c1) · PB
+ k · v2
c1 · z · v
t≈
the drive should initially be tensioned to a maximum of
1.3 T (initial tensioning).
2. Determine E – the deflection per 100 mm length – from
the belt tension characteristics as given in diagram 2,
page 49.
3. Calculate Ea – the deflection for a given span length – for
the actual drive span length L:
Ea ≈
L
E·L
100
= anom · sin
β
2
Apply load f* using the value from Diagram 2 at right
angles to the span at its centre point, as shown in the
figure below. Measure the deflection and adjust if necessary until the correct belt tension is achieved.
∗
When choosing the load to set belt tension f, the number of
ribs must be taken into consideration.
span
48
[mm]
[n]
[n]
Design Hints
Ribbed Belt Tension
Diagram 2: Ribbed Belt Tension Graphs
Profile
k
E = Belt deflection per 100 mm span length [mm]
PH
PJ
PK
f [N]
(per rib)
0.005 3.0
0.009 5.0
0.020 7.5
T = Minimum static belt tension per rib [N]
Profile
k
E = Belt deflection per 100 mm span length [mm]
PL
PM
0.036
0.123
f [N]
(per rib)
10.0
25.0
Design Hints
Ribbed Belt Tension
II. Checking the Ribbed Belt Tension with a “Length
Addition Value”
It has become evident that span deflection methods are not
always the ideal checking procedures for ribbed belts.
The following very easy method for determining the belt
tension is therefore recommended:
1.Calculate the static belt tension “T”.
500 · (2.03 – c1) · PB
T ≈ + k · v2
c1 · z · v
2.The outside length La of the ribbed belt should be measured on the top surface with the belt slack prior to fitting it
to the drive. Measurement may also be carried out on the
drive itself, but without tension.
3.Calculate the length addition value “A” by using the formula:
A≈LbSt · R
Example:
PB= 23.4 kW
c1= 1.0
v = 16.6 m/s
Drive specification with 1 optibelt RB ribbed belt
12 PL 1075
500 · (2.03 – 1.0) · 23.4
T ≈ + 0.036 · 16.62 ≈ 70 N
1.0 · 12 · 16.6
When fitted for the first time, the tension should
be multiplied by a factor of 1.3.
T ≈ 1.3 · 70 ≈ 91 N
Length measured on the back of the belt whilst slack
La = 1100 mm
A≈ 1075 · 0.00264 ≈ 3 mm
R =Stretch factor from table 19, page 51
4.This length addition value “A” should then be added to the
measured outside length (from step 2).
La∗ ≈ La + A
5.The ribbed belt should then be tensioned until the outside
length La∗ calculated in step 4 is obtained. The belt tension
will then be correct.
6.If the drive is to be retensioned, the ribbed belt must first
be slackened off so that it can be measured in a stress free
condition. The procedure as detailed in steps 4 and 5 is
then repeated.
Tighten the belt until the length measured around the outside
is 1103 mm. The belt is then correctly tensioned.
III.Checking the Ribbed Belt Tension by Measurement of the Static Shaft Loading
A very accurate method for the setting of the correct belt
tension is by direct measurement of the static shaft loading
using the formula:
β
Sa ≈ 2 T · sin · z
2
This checking method does, however, call for specialised
measuring instruments.
La∗ ≈ 1100 + 3 = 1103 mm
Design Hints
Ribbed Belt Tension
Table 19: Stretch Factor R for optibelt RB Ribbed Belts
Profile
PH
PJ
PK
PL
15
20
25
30
35
0.00155
0.00207
0.00263
0.00331
0.00407
0.00090
0.00130
0.00168
0.00206
0.00248
0.00065
0.00077
0.00066
0.00080
40
45
50
55
60
0.00500
0.00600
0.00700
0.00831
0.00958
0.00300
0.00348
0.00406
0.00459
0.00522
0.00093
0.00114
0.00136
0.00160
0.00192
0.00094
0.00109
0.00127
0.00142
0.00160
0.00062
0.00072
65
70
75
80
85
0.01085
0.01229
0.01356
0.01500
0.01636
0.00580
0.00644
0.00715
0.00786
0.00863
0.00223
0.00254
0.00280
0.00312
0.00346
0.00175
0.00191
0.00212
0.00228
0.00242
0.00079
0.00087
0.00098
0.00101
0.00111
90
95
100
120
140
0.01780
0.01924
0.02070
0.02644
0.00949
0.01021
0.01106
0.01469
0.01849
0.00377
0.00411
0.00445
0.00572
0.00693
0.00261
0.00277
0.00297
0.00369
0.00437
0.00120
0.00124
0.00135
0.00159
0.00190
0.02229
0.00820
0.00949
0.01095
0.00509
0.00580
0.00651
0.00735
0.00811
0.00219
0.00249
0.00279
0.00314
0.00340
0.00849
0.00356
0.00373
0.00405
0.00438
0.00518
160
180
200
220
240
250
260
280
300
350
PM
400
440
460
480
500
0.00598
0.00674
0.00706
0.00742
0.00772
520
540
560
580
600
0.00814
0.00850
0.00889
0.00929
0.00968
620
640
660
680
700
0.01004
0.01036
0.01076
0.01116
0.01156
720
0.01196
Intermediate values can be calculated by linear interpolation.
Design Hints
Technical Aids
Frequency Tension Gauge optibelt TT MINI S
The optibelt TT mini frequency tension tester is
used to check the tension of drive belts by measuring their frequency of vibration.
Due to its compact design, this frequency tension tester offers
universal application possibilities for drives in engineering, in
the automotive industry and for many other technical applications.
The TT MINI S can be used even in places that are especially
difficult to access.
It can be used for quick and easy measurement of the tension
of V-belts, kraftbands, ribbed belts and timing belts.
In addition, the TT MINI S
offers further advantages:
• Indication in Hertz [Hz]
• L arge measuring range from 10 to 600 Hz
•E
asy to measure with repeatable accuracy
•S
mall, compact design (the size of a mobile phone)
•A
utomatic switch-off function
•P
recise factory calibration and
CE certification
The device is ready to use straight away after switching on.
Set the tensioned belt in vibratory motion by striking with
a finger or an object.
Hold the measuring head over the belt to be tested. The
TT MINI S starts to take readings and shows the results in
Hertz (Hz).
The type, condition and colour of the belt do not influence
readings as an acoustic measuring principle is used.
Calculation of Static Belt Tension
Formula: T = 4 · k · L2 · f2
T ≙ Static belt tension [N]
k ≙ Weight per metre [kg/m]
L ≙ Belt span length [m]
f ≙ Frequency [Hz]
Technical Data
Display:
LCD, 2 lines
Range of measurement:
10 to 600 Hz
Measuring accuracy:
10-400 Hz +/– 1 %
> 400 Hz
+/– 2 %
Resolution:
10-99.9 Hz 0.1 Hz
> 100 Hz
1 Hz
Sensor:
acoustic, with electronic suppression
of noice interference
Power supply:
Batteries 2 x 1 micro (AAA)
Power consumption:
max. 12 mA
Operation time:
> 48 hour continuous measurement (depending on the
quality of the batteries used), automatic switch-off after
5 minutes
Dimensions:
110 mm x 50 mm x 25 mm
Weight:
≤ 100 g
Testing:
CE certification,
factory calibration
Accessories:
Batteries, pouch
design hinTs
Technical aids
fRequency Tension gauge optibelt TT oPTical
The optibelt TT oPTical frequency tension tester is
used to check the tension of drive belts by measuring their frequency of vibration.
Due to its compact design, this newly developed gauge offers
universal application possibilities for drives in engineering, in
the automotive industry and for many other technical applications.
It can be used for quick and easy measurement of the tension
of V-belts, kraftbands, ribbed belts and timing belts.
In addition, the TT oPTical
offers further advantages:
• Easy to use
• Measuring range from 5 Hz to 500 Hz
• Compact dimensions
• Maximum reliability
• High accuracy of measurement
• Readings not influenced by ambient noise
• Factory calibrated
• CE certified
the device is ready to use straight away after switching on.
the tensioned belt is set in vibratory motion by striking with
a finger or an object.
Hold the measuring head over the belt to be tested. The
TT OPtICAL starts to take readings and shows the results in
Hertz (Hz).
Technical daTa
display:
LCD, 2 lines
Range of measurement:
5 Hz to 500 Hz
Measuring accuracy:
< 10 Hz = 0.5 Hz
> 10 Hz = 1.0 Hz
sensor:
optical, with sensor
Power supply:
9V block battery
operation time/switch-off function:
> 48 hour continuous measurement (depending on the
quality of the batteries used), automatic switch-off after
2 minutes
dimensions:
170 mm x 45 mm x 30 mm
weight:
≤ 100 g
Testing:
CE certification, RoHs,
precise factory calibration
accessories:
Battery
53
design hinTs
deTeRMining The sTaTic shafT loading /
shafT loading undeR dynaMic condiTions
In order to prevent premature bearing failure, shaft fracture or
over engineered bearings and shafts, it is recommended that
the dynamic axial force be calculated exactly. this is the only
way to determine the stresses to which these components are
exposed in the prime mover and driven machines.
In the case of two pulley drives, the driver and driven shafts
or bearings are subject to the same dynamic axial force, but
in opposite directions.
When tension or guide pulleys are incorporated, the magnitude and direction of the axial force are almost always
different on each pulley. If the magnitude and direction of the
dynamic axial force is to be determined, a graphical solution
using the force parallelogram for the dynamic forces in the
tight side S1 and slack side S2 is recommended.
If only the magnitude of the dynamic axial force is to be
determined, this can be achieved using the formula “Sa dyn”.
Both methods are illustrated by the following example.
Details of the calculation example given on pages 22 to 24:
PB = 23.4 kW
c1 = 1.0
v = 16.6 m/s
β = 175°
dynamic tight side loading during belt operation
S1 ≈
1030 · PB
c1 · v
S1 ≈
1030 · 23.4
≈ 1452 n
1.0 · 16.6
S2 ≈
1000 · (1.03 – 1.0) · 23.4
≈ 42 n
1.0 · 16.6
Dynamic slack side loading during belt operation
S2 ≈
1000 · (1.03 – c1) · PB
c1 · v
a) solution using the formula for sa dyn
dynamic axial force
Sa dyn ≈
S12 + S22 – 2 S1 · S2 · cosβ
b) graphical solution
54
Sa dyn ≈
14522 + 422 – 2 · 1452 · 42 · (– 0.99619) ≈ 1494 n
Design Hints
Length tolerances – Installation and Maintenance –
to ISO 9982
Table 20: Length Tolerances
Effective length
Lb [mm]
>
200 ≤
500
>
500 ≤
750
>
750 ≤ 1000
> 1000 ≤ 1500
> 1500 ≤ 2000
> 2000 ≤ 3000
Profile PH
Profile PJ
Profile PK
Profile PL
Profile PM
Tolerance
[mm]
Tolerance
[mm]
Tolerance
[mm]
Tolerance
[mm]
Tolerance
[mm]
+ 4
– 8
+ 5
– 10
+ 6
– 12
+ 8
– 16
+ 10
– 20
+ 12
– 24
+ 4
– 8
+ 5
– 10
+ 6
– 12
+ 8
– 16
+ 10
– 20
+ 12
– 24
+ 4
– 8
+ 5
– 10
+ 6
– 12
+ 8
– 16
+ 10
– 20
+ 12
– 24
> 3000 ≤ 4000
> 4000 ≤ 6000
+ 6
– 12
+ 8
– 16
+ 10
– 20
+ 12
– 24
+ 15
– 30
+ 20
– 40
+
–
+
–
+
–
12
24
15
30
20
40
Installation and Maintenance
Geometrically correct designing and power rating of drives
with optibelt RB ribbed belts ensures long belt life and a high
degree of operating safety.
Since practice has shown that premature failure can very
often be traced to faulty installation or maintenance, we
recommend that you follow the installation and maintenance
instructions listed below.
•Ribbed belt tension
Once the calculated axial force has been applied, the
tension of the ribbed belts should be checked using
our tension gauges and the methods described on
pages 48 to 51. The belt should be observed regularly
during the first few hours of service. Experience has shown
that the belt will need re-tensioning after between 0.5 and
4 hours at full load to take up the initial belt stretch.
• Safety
Before commencing any maintenance work, ensure that all
machine components are safely positioned and cannot be
altered whilst the work is in progress. It is also important
that the manufacturer’s safety instructions are carefully
followed.
• Tension/guide idlers
Where possible, the use of tension and guide idlers should
be avoided. If this is not possible, refer to the notes on
pages 33 to 34 of this manual and follow any instructions
given.
• Pulleys
The grooves must be in good condition, free from scoring,
sharp edges or rust and all dimensions should conform to
the relevant standard.
•Alignment
Shafts and pulleys should be correctly aligned prior to belt
installation.
We recommend a maximum tolerance of 0.5° in both
planes.
• Maintenance
It is recommended that ribbed belt drives should be
regularly inspected. This should include checking and,
if necessary, correcting the tension.
Suitable guards must be provided to prevent the intrusion
of foreign bodies such as stones, swarf or other material
between the pulley and the belt.
optibelt RB ribbed belts do not require any special care.
Belt dressing (belt wax and spray) should not be used
under any circumstances.
• Installation of ribbed belts
The centre distance should be reduced prior to the installation of ribbed belts so that they may be fitted in the
grooves without undue force. Forcing ribbed belts over the
pulley flanges with a tyre lever, screwdriver or the like,
must be avoided as the damage this causes to the ribs and
low-stretch tension members is often not visible.
Design Hints
Ribbed Belt Widths
Table 21
Number
of ribs z
Profile PH
[mm]
Profile PJ
[mm]
Profile PK
[mm]
Profile PL
[mm]
Profile PM
[mm]
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
3.20
4.80
6.40
8.00
9.60
11.20
12.80
14.40
16.00
17.60
19.20
20.80
22.40
24.00
25.60
27.20
28.80
30.40
32.00
33.60
35.20
36.80
38.40
40.00
41.60
43.20
44.80
46.40
48.00
4.68
7.02
9.36
11.70
14.04
16.38
18.72
21.06
23.40
25.74
28.08
30.42
32.76
35.10
37.44
39.78
42.12
44.46
46.80
49.14
51.48
53.82
56.16
58.50
60.84
63.18
65.52
67.86
70.20
7.12
10.68
14.24
17.80
21.36
24.92
28.48
32.04
35.60
39.16
42.72
46.28
49.84
53.40
56.96
60.52
64.08
67.64
71.20
74.76
78.32
81.88
85.44
89.00
92.56
96.12
99.68
103.24
106.80
9.40
14.10
18.80
23.50
28.20
32.90
37.60
42.30
47.00
51.70
56.40
61.10
65.80
70.50
75.20
79.90
84.60
89.30
94.00
98.70
103.40
108.10
112.80
117.50
122.20
126.90
131.60
136.30
141.00
18.80
28.20
37.60
47.00
56.40
65.80
75.20
84.60
94.00
103.40
112.80
122.20
131.60
141.00
150.40
159.80
169.20
178.60
188.00
197.40
206.80
216.20
225.60
235.00
244.40
253.80
263.20
272.60
282.00
Ribbed belts with more than 30 ribs should be divided.
A space of one rib should be maintained between two ribbed belts.
Design Hints
Problems – Causes – Remedies Problem
Causes
Remedies
Excessive wear of ribs
Belt tension too low
Check belt tension and correct
Ingress of foreign body during running
Fit an effective guard
Pulley misalignment
Re-align pulleys
Faulty pulleys
Re-machine or replace pulleys
Wrong belt or pulley profile
Belt and pulley profiles must be
correctly matched
Belt rubbing or catching on protruding
parts
Remove any parts that are in the way;
re-align drive
Drive stalled
Ascertain cause and put it right
Drive overloaded
Check drive conditions and re-dimension
Contamination with oil, grease or
chemicals
Protect drive from environmental influences
Outside idler pulley in use whose
position and size is not as recommended
Follow OPTIBELT recommendations,
e.g. increase pulley size; replace with
inside idler on the slack side of the drive
Pulley diameter too small
Re-design using recommended minimum
pulley diameters
Excessive exposure to heat
Remove or shield from heat source;
ensure good ventilation
Excessive exposure to cold
Warm belt before start up
Abnormal belt slip
Re-tension drive according to installation
instructions; check drive design and
modify if necessary
Chemical influences
Shield drive
Ribbed belt breakage shortly
after fitting
(belt torn)
Rib breakage and cracks
(brittleness)
Design Hints
Problems – Causes – Remedies
Problem
Causes
Remedies
Severe belt vibration
Drive undersized
Check drive design and modify
if necessary
Drive centre distance significantly
longer than recommended
Shorten centres, use an inside idler on
the belt slack side
High shock loading
Use an inside idler on the slack side
Belt tension too low
Correct belt tension
Unbalanced pulleys
Balance pulleys
Ribbed belts cannot be
re-tensioned
Excessive running noise
Ribbed belt swelling
and softening
Insufficient allowance for centre distance Modify drive to allow for the OPTIBELT
in drive design
recommended take-up
Excessive stretch caused by overloaded
drive
Carry out drive calculation and
re-design
Incorrect belt length
Use a shorter belt
Poor pulley alignment
Align pulleys
Belt tension too low or too high
Check belt tension
Drive overloaded
Check drive design and modify
if necessary
Contamination with oil, grease or
chemicals
Protect drive from source of
contamination
Clean pulleys with cleaning solvent or
benzene before fitting new ribbed belts!
Please contact our Applications Engineering Department in the case of other faults. Please give us as much technical information as possible to assist us with
replying to your query.
design hinTs
addiTional Range
optibelt TT Mini s
For quick and easy measurement of the tension of V-belts,
kraftbands, ribbed belts and timing belts.
Equipped with a flexible goose neck for easy measuring in
difficult to access areas.
optibelt TT oPTical
For quick and easy measurement of the tension of V-belts,
kraftbands, ribbed belts and timing belts.
The type, condition and colour of the belt do not influence
readings as an optical measuring principle is used.
optibelt laseR PoinTeR ii
an indispensable aid for belt drives
the user-friendly optibelt LASEr POIntEr II is a device of
proven value, especially for everyday use. the optibelt
LASER POINTER II makes it easier to align belt drives.
It also helps to determine the most common causes of drive
failures:
• Axial misalignment of the pulley
• Horizontal angular misalignment
• Vertical angular misalignment
oPTibelT Pulley gRoove gauges
Belts and pulleys can be quickly and effortlessly identified
with these groove gauges. they also enable pulley groove
edges to be tested for angular deviation and wear.
59
Data Sheet
for Drive Calculation/Checking
.
.
Company
Street/PO Box
Postcode/zip code; town
Administrator
DepartmentDate
Tel. ( )
Email
Fitted with:
For trials
New drive
For pilot series
For production series
Requirement________ belts/year
Pieces
Existing drive
Prime Mover
Type
Profile
Number of ribs
Manufacturer
Driven Machine
(e.g. electric motor, diesel engine 3 cyl.)
Size of starting load
Method of starting
Effective length
_______________________________
(e.g. starting load = 1.8 normal load)
(e.g. star delta)
Operation hours per day
Type
___________________
(e.g. lathe, compressor)
_________________________________________
Start:loaded
unloaded
__________________________________
_____________ _____________________________
Number of starts______________ per hour
per day
Rotational reverses____________ per minute
per hour
Nature of load:
constant
pulsating
shock
Power:
P normal_________________________________________kW
Load:
P normal___________________________________kW
P maximal________________________________________kW
P maximal__________________________________kW
or max. torque____________________ Nm at n1 _______________ rpm
or max. torque____________________ Nm at n2 _______________ rpm
Speed of driver pulley n1 __________________________________ rpm
Speed of driven pulleyn2 __________________________________ rpm
Position of shafts:
horizontal
vertical
n2 min _______________________________ rpm
angled
<)______________________ °
n2 max _______________________________ rpm
Maximum allowed static shaft loading Sa max ___________________ N
Maximum allowable static shaft loading Sa max _________________ N
Effective or outside diameter of driver pulley:
Effective or outside diameter of driven pulley:
db1
db2
________________________________________________mm
________________________________________________mm
db1 min ________________________________________________mm
db2 min ________________________________________________mm
db1 max________________________________________________mm
db2 max________________________________________________mm
Pulley face width b2 max _____________________________________mm
Pulley face width b2 max _____________________________________mm
Speed ratio
i ___________________ imin ____________ imax __________________
Drive centre distance
a ________________ mmamin _________ mmamax ______________ mm_
Tension/guide idler pulley:insid
in drive slack side
outside
in drive tight side
db _______________ mm
ribbed pulley
moveable
da _______________ mm
flat pulley
Drive Conditions: Ambient temperature
(e.g. spring loaded)
_________
_________________________________ °C/F min.
fixed
_________________________________ °C/F max.
Exposure to oil (e.g. oil mist, droplets)
water
(e.g. spray)
_____________________________
acid
(type, concentration, temperature)
dust
(type)
____________________________________
______________________
_______________________________________
Special conditions: Where the drive has inside or outside idler pulleys, three or more driven pulleys
or counter-rotating shafts then a drawing or any other relevant information should
be submitted.
Drive Details:
Notes
Notes
Notes
Owner of any and all copyrights and intellectual property rights as well as other rights of use and exploitation:
Arntz OPTIBELT Group, Höxter/Germany.
Any use, exploitation, reproduction, and any transfer to third parties by any means shall require the prior written approval
of the Arntz OPTIBELT Group, Höxter/Germany.
Print: 414771/0513Hux
OPTIBELT GmbH
37671 Höxter
T +49 (0) 52 71- 6 21
F +49 (0) 52 71- 97 62 00
GErmAny
E info @ optibelt.com
Corveyer Allee 15
www.optibelt.com

Technical Manual Ribbed belT dRives

Transcription

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