The function of wave spring in motor bearing system is to apply axial and load, so the elastic force of this spring should be equal to the preload value to be applied. That is, the elastic force of the wave spring at the test height should be within the range of axial preload required by the bearing. Beyond this range, the wave spring will be worn.

However, such wear is unfavorable to the wave spring and therefore to the preload of the bearing. So why is there such wear after the spring is compressed and deformed?

It is very likely that the bearing system vibrates during operation, and the direction of this vibration may have radial and axial components. This causes contact friction between the bearing end face and the wave spring, resulting in such wear. If Smalley wave spring is selected, it can not only apply preload to the bearing, but also eliminate the free movement of some bearings and reduce the noise of the bearing.

In addition, the wear of the wave spring may be the serious race of the bearing outer ring. This is not difficult to find by careful observation.

If an axial force is applied to the wave spring in the motor, the wave spring will deform within a reasonable range and will not damage the ability of the wave spring. Even if it is beyond the deformation range, the wave spring will lose its elastic capacity and will not break considering the elasticity of the metal. So how did the fracture of the wave spring formed in the actual working condition?

The fracture of metal is caused by fatigue at first, which is the same as the fatigue of bearing. Shear stress often occurs repeatedly and reaches a certain number of times, leading to fatigue.

If the wave spring only works under a shear stress, it is difficult to produce fatigue fracture. That must be the result of reciprocating shear stress. For the motor, the greatest possibility is that when the motor works in vibration, the waveform spring is constantly compressed, rebounded, recompressed and rebounded. In this case, the waveform spring is more likely to break.