Abstract: It is an inevitable phenomenon that the skidding of deep groove ball bearings during operation, which will accelerate bearing wear, reduce rotation accuracy, and cause severe vibration and noise. In order to reveal the skidding mechanism of bearings, the parameters of cage pocket clearance are introduced. The interaction between rolling elements and cage units, rolling elements and raceways, and cage units are analyzed. The skidding dynamic model of deep groove ball bearing is developed. Based on the fourth-order Runge-Kutta method, the dynamic differential equations are solved, the simulation signals of the model are obtained, and the simulation results of the model are analyzed. The effects of different rotational speeds, radial loads, equivalent stiffness between flexible cage units, and cage pocket clearance on the sliding speed between inner ring and rolling elements and cage slip ratio are studied. The results show that high speed and low load will aggravate the skidding of the bearing. Increasing the equivalent stiffness between flexible cage units or reducing the cage pocket clearance can reduce the skidding of the bearing. However, neglecting the cage pocket clearance leads to more severe skid behavior. The study provides a theoretical basis for the structural design and failure analysis of deep groove ball bearings.

Key words: deep groove ball bearing, dynamic modeling, cage, pocket clearance, skidding characteristics