What are the hazards of loose fit between the output shaft of XWD4-35-1.5KW cycloidal reducer and the inner hole of the coupling

Transmission slippage and wear of mating surfaces

Excessive clearance can cause relative sliding or minor impact between the inner hole of the coupling and the shaft diameter. Under long-term operation, obvious wear marks, grooves, and even blackening may appear on the surface of the shaft diameter, resulting in a decrease in the actual effective diameter and severely weakening the strength of the shaft.

2. Abnormal stress and cracking of keys and keyways

When the fit between the shaft and the hole is too loose, torque transmission will rely entirely on the flat key. This can cause the key strip to bear extremely high shear and compression stresses, making it prone to deformation of the keyway edge under pressure, wear and loosening of the key strip, and even cracking at the keyway.

3. Severe vibration and abnormal noise

If the gap is too large, it will cause radial jumping during rotation, triggering low-frequency vibrations and a "idle jump" type step response. There will be obvious abnormal noise and shaking during the operation of the equipment, which will disrupt the smoothness of the transmission.

4. Risk of premature failure and shaft breakage of bearings

Continuous vibration and misalignment can cause additional radial forces and alternating bending moments on the output bearings of the gearbox, resulting in excessive local stress and overheating of the bearings, significantly reducing their service life. In extreme cases, long-term fatigue stress concentration can cause the output shaft to fracture at the shoulder or keyway transition.

5. Decreased transmission accuracy and efficiency

Loose coordination can introduce nonlinear backlash, resulting in significant backlash during reverse transmission, seriously affecting the positioning accuracy and synchronization of the equipment, and increasing additional energy loss.