In high-speed angular contact ball bearings,the impact of the ball and the cage will cause the ball skidding on the raceway,which will cause the raceway to be scratched and the premature failure of the bearing.In order to explore the instantaneous sliding caused by the impact of the ball and the cage,a high-speed angular contact ball bearing was taken as the research object.Through the dynamic simulation of angular contact ball bearings under combined load,the effects of variable speed conditions and cage structure parameters on the impaction between the ball and the cage,the impact skidding between the ball and the raceway,and the wear rate of the bearing parts were analyzed.It is found that the movement of the ball and the cage presents periodic changes under the acceleration,deceleration and constant speed.Due to the change of revolution speed when the ball enters and leaves the radial load area,the ball collides with the cage and causes the ball to slide relative to the inner and outer ring raceways.In order to adapt to the change of the ball revolution speed,appropriately increasing the cage pocket clearance can reduce the force and collision frequency between the ball and the cage pocket,thereby reducing the impact skidding of the ball and the raceway and the wear rate of the cage.