Abstract

This paper presents a mechanical model of angular contact ball bearing with local and extended defects in the outer raceway and the analytical formulations of varying stiffness under combined loads are obtained. The effects of radial load and clearance on variable stiffness of the bearing at the boundary positions are analyzed. Results show that the load distribution is not necessarily continuous and the maximum and minimum stiffness of the angular contact ball bearing can be located at either of the two boundary positions or even at non-boundary position under the effect of the contact angle. Meanwhile, the effects of defect depth and loads on the mechanical properties and varying stiffness of the bearing under localized and extended defects are studied, respectively, and the mechanism of “limit depth” and “critical load” is analyzed. These results are useful for quantitative fault diagnosis and reliability analysis of rotor-bearing systems.

摘要

本文提出了一种在外滚道中具有局部和扩展缺陷的角接触球轴承的力学模型，并获得了组合载荷下不同刚度的解析公式。分析了径向载荷和游隙对轴承边界位置可变刚度的影响。结果表明，载荷分布不一定是连续的，并且在接触角的作用下，角接触球轴承的最大刚度和最小刚度可以位于两个边界位置中的任意一个位置，甚至可以位于非边界位置。同时，分别研究了缺陷深度和载荷对局部缺陷和扩展缺陷下轴承力学性能和刚度变化的影响，并分析了“极限深度”和“临界载荷”的机理。