Pulley In Motor

1. How It Works (Wedge Friction Principle)
Unlike flat belts, the V-belt pulley relies on the wedge effect:

The belt sits in a V-shaped groove and transmits torque through sidewall contact between the belt flanks and the groove faces.

Under load, the belt is wedged deeper into the groove, generating high friction without slipping.

This provides shock absorption during start-up and overload conditions, protecting the motor from sudden torque spikes.

2. Three Critical Sizing Parameters for Motor Pulleys
When selecting a V-belt pulley for a motor, these parameters are mandatory:

Parameter Description
Bore Size Must exactly match the motor shaft diameter (e.g., 38mm shaft = 38mm bore). Taper bushings allow variable bore adaptation.
Keyway Motor shafts have a keyway for torque transmission. The pulley's keyway must align precisely with the motor shaft key.
Groove Section Determines which belt to use. Must match exactly - mismatch causes rapid belt wear, slipping, or falling off.