<p>Bearing skidding is an inevitable phenomenon in operation, which damages the lubricant film, leading to scuffing on the surfaces of bearing raceways and rolling elements. To reveal the bearing skidding mechanism, this study investigates the effects of pocket clearance variations on skidding dynamics in deep-groove ball bearings. By integrating theoretical modeling with numerical simulations, a nonlinear dynamic model for deep groove ball bearing is developed. Moreover, factor of the lubricating oil film into account based on the elastohydrodynamic lubrication theory is considered. Systematic analysis is conducted on self-rotation and skidding characteristics of rolling balls under different specific clearance values, along with ball-cage contact mechanics examination. Key findings demonstrate that pocket clearance critically affects ball-cage dynamic interactions. The skidding rate shows a non-monotonic relationship with clearance size, which shows an initial decrease followed by subsequent increase. Collision forces in both loaded and unloaded zones correspondingly exhibit analogous trend reversal patterns. Kinematic analysis reveals that collision forces concentrate on the cage’s rear (cage drive ball) in the first half of the loaded zone, while the forces transition to the cage’s front (ball drive cage) in the latter half of the loaded zone. The unloaded zone shows cage-propelled rotation initially, with minor lateral collisions during ball transit. Optimal pocket clearance in bearing cages effectively mitigates skidding and frictional energy dissipation, thereby improving rotational stability and prolonging fatigue life. This study provides a fundamental theoretical framework for anti-skidding bearing design, offering actionable insights into cage geometry optimization and holistic enhancement of mechanical system reliability.</p>