Defects In Bearings and Causes Of Bearing Defects

Defects In Rolling Contact Bearings

Even when bearings are being used under ideal conditions, failures of bearings are caused by deterioration of the material due to rolling fatigue. Generally, the service life of bearings is expressed either as a period of time or as the total number of rotations before the occurrence of failures in the inner ring, outer ring or rolling element because of rolling fatigue, due to repeated stress.Rolling bearings sometimes fracture earlier than expected.The following causes should be considered;

1. Inappropriate use of bearings
2. Faulty installation or improper processing
3. Improper lubricant, lubrication method or sealing device
4. Inappropriate speed and operating temperature
5. Contamination by foreign matter during installation
6. Abnormally heavy load

is important to investigate the phenomenon to determine the causes. At this time, not only the bearing but also the shaft, housing, and lubricant used with the bearing should be comprehensively investigated, together with the bearing.To judge the causes of failure, sufficient knowledge and experience in bearings and lubricants and a good understanding of the characteristics of the equipment are necessary. In addition, consideration of the installation conditions and operational process of the bearing is required.

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