The running surface is peeled off. Obviously uneven after peeling.
Reason: Bearing rolling elements and inner and outer ring raceway surfaces are subjected to periodic pulsating loads, resulting in periodic contact stresses. When the number of stress cycles reaches a certain value, fatigue peeling occurs on the working surfaces of the rolling elements or inner and outer ring raceways.
If the bearing load is too large, this fatigue will increase. In addition, if the bearing is installed incorrectly and the shaft is bent, the raceway will peel off.
Solution: Re-study the use conditions and select the bearing and clearance, and check the machining accuracy, installation method, lubricant and lubrication method of the shaft and bearing box.