For the sustainable development of society, environmental regulations related to automobiles are being strengthened day by day, and low fuel consumption and electrification are continuing to advance.Compared with the previous use conditions, in addition to rotating, the use in the shaking state will gradually increase.

　　In a shaking environment, the fretting wear between the raceway and the rolling elements of the bearing will cause abrasion or cause noise and vibration.In addition, automotive bearings are often used in high-temperature environments. In addition to wear resistance, they also have certain requirements for heat resistance.

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