滚动轴承保持架-滚动体接触动力学建模与接触特性

采用非线性弹簧单元、阻尼单元模拟保持架与滚动体之间的碰撞接触，并综合考虑碰撞接触、摩擦以及兜孔间隙等非线性因素，建立了滚动轴承动力学分析模型。通过动力学仿真研究了保持架与滚动体之间的碰撞接触特性及轴承载荷、转速对保持架接触特性的影响。研究结果表明:滚动体与保持架兜孔前、后端交替产生非连续性碰撞接触并造成保持架转速出现不规律的波动。滚动体与保持架兜孔前、后端接触力的最大值和保持架转速的波动范围随着轴承径向载荷的增加而减小，随轴承转速的增加而增大。所建立模型可为滚动轴承的设计及保持架的失效分析提供理论依据。 

Dynamic modeling of the contact between cage and rolling element in rolling bearing and contact characteristics

Nonlinear spring element and damping element were used to simulate the collision contact between the cage and the rolling element, and a dynamic model of rolling bearing was proposed considering some nonlinear factors such as collision contact, friction, cage pocket clearance, etc. Collision contact characteristics between the cage and the rolling element were investigated by dynamic simulation, the influences of bearing load and rotational speed on the cage contact characteristics were also analyzed. The results showed that discontinuous collision contacts appeared between the rolling element and cage pocket front bar or rear bar alternately, and the rotational speed of the cage fluctuate d irregularly because of the contact forces. The maximum contact force and the fluctuation range of cage rotatioanal speed decreased with the increase of bearing radial load, and increased with the increase of rotational speed of bearing. The proposed model can provide a theoretical basis for the design of rolling bearing and failure analysis of the cage.