Abstract:  Aiming at the problems of premature bearing failure caused by multi-point contacts between the steel ball and the raceway of four-point contact ball bearings， taking QJ214 four-point contact ball bearings as the research object， the ball and the raceway contact models were established， and the causes of multi-point contacts between the ball and the raceway were analyzed when the structural parameters and working condition parameters were changed. The results show that with the increase of the coefficient of inner and outer raceway groove curvature radius or the thickness of inner and outer gasket， the contact state between the ball and the raceway may be changed from three-point contact to two-point contact， and then to three-point contact. At constant speed condition， with the reduction of axial load， the contact state between the ball and the raceway may be changed from two-point contact to three-point contact. When the rotational speed and the axial load are constant， the increase of radial loads may make the contact state of some steel balls and the raceway change from two-point contact to three-point contact， and then to four-point contact. The research findings may provide reference for avoiding the cats eye ring wear failure caused by multi-point contact during the running of four-point contact ball bearings. 

Key words: four-point contact ball bearing, multi-point contact, structural parameter, working condition parameter, wear failure

摘要： 针对四点接触球轴承钢球与沟道间发生多点接触引起轴承过早失效的问题，以QJ214四点接触球轴承为研究对象，建立了钢球-沟道接触模型，分析了结构参数及工况参数变化时钢球-沟道发生多点接触的成因。研究结果表明，内外圈沟道曲率半径系数或内外垫片厚度的增大可使钢球-沟道接触状态由三点接触转变为两点接触，再转变为三点接触；恒定转速时，轴向载荷的减小可使钢球-沟道接触状态由两点接触转变为三点接触；转速及轴向载荷均恒定时，径向载荷的增大可使部分钢球-沟道接触状态由两点接触转变为三点接触，再转变为四点接触。研究成果为避免四点接触球轴承在运转过程中发生多点接触而引起的猫眼圈磨损失效提供了参考。

关键词: 四点接触球轴承, 多点接触, 结构参数, 工况参数, 磨损失效