technical data Synchronous Belts and Belt Sprockets design data

Selection and design (Lock Belt Sprockets C type)

Check the maximum transmission torque

Follow the steps below to select a C-type Lock Belt Sprockets.

The maximum torque and thrust load are calculated by multiplying the transmission capacity by Service factor.

Maximum torque T max

[SI units]

Tmax (N・m) = 9550 × KW × SF n

Gravity Units

Tmax (kgf・m) = 974 × KW × SF n

Maximum thrust load P max

Pmax (N{kgf}) = Pax × SF

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

When torque and thrust loads are applied simultaneously, calculate the combined load MR max using the following formula.

MR max = (T max) 2 + (P max × d /2000) 2 N・m{kgf・m} d: Shaft diameter (mm)

Compare the T max or MR max obtained above with the sleeve's transmission torque Mt.​

It can be used if Mt ≧ T max or MR max.

Cannot be used if Mt < T max or MR max.

Service factor SF

Load Condition Service factor SF
Smooth, shock-free transmission Small load inertia
Inertia ratio 1.0 or less		 1.2～1.5
Transmission with light impact During load inertia
Inertia ratio 1.0~3.0		 1.5～2.0
High shock load
Or forward/reverse		 Large load inertia
Inertia ratio 3.0 or more		 2.0～5.0

Considering the axis

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

δ0.2S ≧ 1.2 × P

δ 0.2S: Yield point of shaft material (MPa) P: Shaft side pressure (see below) (Mpa)

When using a hollow shaft, use a shaft with an inner diameter d B that satisfies the following formula.

dB ≦ d × δ0.2S - 2 × P δ0.2S

d: Shaft diameter (mm) δ 0.2S: Yield point of shaft material (MPa)

Clamp collar specifications list

Clamp collar specifications list
Model number size mass
g		 Fastening bolt Shaft Hole Diameter
d
mm		 Pulley material: Aluminum alloy Pulley material: Carbon steel for machine construction
dc
mm		 Dc
mm		 Bc
mm		 Number size Tightening torque
​M.A.		 Transmission Torque
Mt		 Thrust load
Pax		 Shaft side pressure
P		 Transmission Torque
Mt		 Thrust load
Pax		 Shaft side 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 is the mass of Standard Stock Belt Sprockets plus the mass of the clamp collar in the table above.