Belt or Chain Transmission Applications
The force acting on the pulley or sprocket wheel when power is transmitted by a belt or chain is calculated using the following equations.
M =9 550 000 H / n (N-m)
P k = M / r
where
| M : |
Torque acting on pulley or sprocket wheel (N-mm) |
| P k : |
Effective force transmitted by belt or chain (N) |
| H : |
Power transmitted (kW) |
| n : |
Speed (rpm) |
| r : |
Effective radius of pulley or sprocket wheel (mm) |
When calculating the load on a pulley shaft, the belt tension must be included. Thus, to calculate the actual load K b in the case of a belt transmission, the effective transmitting power is multiplied by the belt factor f b , which represents the belt tension. The values of the belt factor f b for different types of belts are shown in the table.
K b = f b · p k
In the case of a chain transmission, the values corresponding to f b should be 1.25 to 1.5.
| Type of Belt |
f b |
| Toothed belts |
1.3 ~ 2 |
| V belts |
2 ~ 2.5 |
| Flat belts with tension pulley |
2.5 ~ 3 |
| Flat belts |
4 ~ 5 |
