考虑外滚道缺陷的滚动轴承刚度时变特性分析

滚动轴承的主要失效形式之一是在滚道或滚动体表面产生缺陷，形成疲劳点蚀，对轴承性能产生很大影响。针对深沟球轴承，建立外滚道存在方形缺陷时的动力学模型，获取缺陷对载荷分布的影响规律，建立轴承时变刚度模型，分析缺陷尺寸演化和位置对轴承刚度时变特性的影响规律。结果表明:当缺陷位于非承载区时对轴承平均刚度无影响；当缺陷位于承载区时，轴承的平均刚度与缺陷长度和深度负相关；缺陷位置由底端向非承载区变化时，轴承的平均刚度先减小后增大。

Analysis of Time-Varying Characteristics of Rolling Bearing Stiffness Considering Defects of Outer Raceway

One of the main failure modes of rolling bearings is to produce defects on raceway or surface of rolling body,forming fatigue pitting corrosion,which has a great impact on bearing performance.For deep groove ball bearings,a dynamic model with square defects in outer raceway was established to obtain the influence law of defects on load distribution,and a bearing time-varying stiffness model was established to analyze the influence law of defect size evolution and location on time-varying characteristics of bearing stiffness.The results show that the average stiffness of bearing is not affected when the defect is located in the non-bearing zone; when the defect is located in the bearing zone,the average stiffness of the bearing is negatively correlated with the defect length and depth; when the defect location changes from bottom to non-bearing zone,the average stiffness of bearing decreases first and then increases.