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

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