Technical Data  Synchronous Belts / Belt Sprockets  Design Guide

Selection and Design (Lock Belt Sprockets C)

Verification of the maximum transmission torque

Select Lock Belt Sprockets C Type according to the following procedure:

Calculate the maximum generated torque and the maximum generated thrust load by multiplying a service factor by the generated transmission capacity.

Max. Generated Torque Tmax

[SI units ]

Tmax (N・m) = 9550 × KW × SF n

[Gravity unit ]

Tmax (kgf・m) = 974 × KW × SF n

Max. Thrust Load Pmax

Pmax (N{kgf}) = Pax × SF

  • KW：Transmission capacity kW
  • SF：Service factor (Choose from the table below)
  • n：Speed r/min
  • Pax：Maximum thrust load N{kgf}

If the torque and thrust load are applied simultaneously, calculate the synthetic load MRmax using the following formula:

MRmax = (Tmax)2 + (Pmax × d/2000)2  N・m{kgf・m}  d：Shaft diameter (mm)

Compare Tmax or MRmax value calculated above with the transmission torque Mt of the sleeve.

OK Mt ≧ Tmax or MRmax

NG Mt < Tmax or MRmax

Service factor SF

Load conditions Service factor SF
Smooth transmission with no impact Small load inertia Inertia ratio of 1.0 or lower 1.2～1.5
Transmission with mild impact Medium load inertia Inertia ratio of 1.0 to 3.0 1.5～2.0
Load with major impact or forward and reverse rotation Large load inertia Inertia ratio of 3.0 or higher 2.0～5.0

Selection of the shaft

Use a shaft made of a material that satisfies the following formula:

δ0.2S ≧ 1.2 × P

δ0.2S：The yield point of the material used for the shaft (MPa)  P：Shaft-side contact pressure (See below) (Mpa)

When a hollow shaft is used, use a shaft with an inner diameter dimension dB that satisfies the following formula:

dB ≦ d × δ0.2S - 2 × P δ0.2S

d：Shaft diameter (mm)  δ0.2S：The yield point of the material used for the shaft (MPa)

Clamp collar specification

Clamp collar specification
Model No. Dimensions Mass
g		 Tightening bolts Shaft Bore Diameter
d
mm		 Belt Sprockets Materials ：Aluminum alloy Belt Sprockets Materials ：Carbon steel for machine structural use
dc
mm		 Dc
mm		 Bc
mm		 Pieces Size Tightening torque
MA		 Transmission Torque
Mt		 Thrust load
Pax		 Shaft-side contact pressure
P		 Transmission Torque
Mt		 Thrust load
Pax		 Shaft-side contact pressure
P
N・m kgf・m N・m kgf・m N・m kgf・m N・m kgf・m N・m kgf・m N・m kgf・m N・m kgf・m
C1 9.2 30 10 19 2 M4×12 3.8 0.39 6 2.8 0.29 0.93 95 193 19.7 6.9 0.70 0.7 72 266 27.1
7 3.5 0.36 1.00 102 185 18.9 7.1 0.72 0.75 77 255 26.0
C2 11.0 33 10 22 M4×12 3.8 0.39 8 4.7 0.48 1.18 120 162 16.5 9.2 0.94 1.11 114 223 22.8
9 4.9 0.5 1.09 111 144 14.7 9.9 1.01 1.35 138 198 20.2
C3 13.4 40 12 39 M5×15 7.5 0.77 10 11.1 1.13 2.22 227 151 15.4 18.9 1.93 2.45 250 208 21.2
11 8.9 0.91 1.62 165 150 15.3 17.9 1.83 2.34 239 207 21.1
C4 16.4 42 12 42 M5×20 7.5 0.77 12 13.4 1.37 2.23 228 138 14.1 22.7 2.32 3.22 329 190 19.4
14 14.2 1.45 2.03 207 118 12.0 26.4 2.69 4.39 447 163 16.6
C5 19.4 45 12 46 M5×20 7.5 0.77 15 19.1 1.95 2.55 260 110 11.2 28.3 2.89 5.04 515 152 15.5
16 22.9 2.34 2.86 292 103 10.5 30.2 3.08 5.75 586 142 14.5
17 19.7 2.01 2.32 236 97 9.9 32.1 3.28 6.49 662 134 13.7
C6 22.8 53 15 78 M6×20 12.6 1.3 18 35.7 3.64 3.97 405 98 100 47.8 4.88 9.56 976 134 13.7
19 38.4 3.92 4.04 412 100 10.2 50.5 5.15 9.9 1010 137 14.0
20 31.9 3.26 3.19 326 95 9.7 53.2 5.43 10.98 1120 131 13.4

Approximate mass

The approximate mass can be figured out by adding the clamp collar unit mass in the table to the mass of the standard belt sprocket.