Bearing fracture sometimes occurs on the bearing ring (outer ring or inner ring), but it also occurs on the rolling element. Why does the bearing fracture along the cross section of the outer ring or inner ring? The fracture of the bearing may be related to the application of the bearing and the material of the bearing itself.

For a qualified bearing, when the stress exceeds the tensile strength limit of the bearing material, cracks will occur and expand. Fracture is the result of the crack expanding to a certain extent and a part of the part being completely separated. There are three reasons why the bearing will fracture along the cross section of the outer ring or inner ring:

1. The inner ring or outer ring of the bearing is too loose, and the inner ring or outer ring of the bearing has creeping phenomenon during the rotation process. The creeping deformation will cause fatigue of the bearing along the cross section (accompanied by noise), and cracks will occur after a certain period of fatigue, eventually leading to fracture.

2. The inner ring of the bearing is too tight, resulting in excessive tensile stress in the inner ring of the bearing along the circumferential direction. When the bearing is rotating, it will cause local stress concentration and superposition under the action of external impact force (more or less inevitable). The bearing will crack (accompanied by noise), which will eventually break after further expansion.

3. Poor dynamic balance. Due to poor dynamic balance, the cyclic stress is greatest in a local area of ​​the cross-sectional surface at the heavy end of the bearing, where fatigue occurs most quickly (accompanied by noise). After a certain period of fatigue, cracks will form and eventually lead to fracture.

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