自旋对角接触球轴承弹流润滑与油膜刚度的影响

Influence of Spinning on Elastohydrodynamic Lubrication and Film Stiffness of Angular Contact Ball Bearings

根据角接触球轴承自旋运动特征,同时考虑弹流润滑效应,建立角接触球轴承考虑自旋运动的弹流润滑模型;采用多重网格法求解弹性变形,利用有限差分法迭代求解雷诺方程,得到较为精确的数值解;分析不同赫兹接触压力、滚道表面粗糙度下自旋对角接触球轴承弹流润滑和油膜刚度的影响。结果表明:考虑自旋时随着Hertz接触压力、自旋角速度增大,油膜厚度减小,油膜压力增大,油膜承压区域呈细长状,并向接触中心靠近;随着滚道表面粗糙度幅值增大,油膜压力和膜厚均出现了波动,且考虑自旋运动时,轴承油膜厚度明显减小,油膜局部压力峰值更大;随着卷吸速度、润滑油黏度增大,油膜刚度减小,而考虑自旋运动时油膜刚度值更大;随着自旋角速度增大,油膜刚度逐渐增大。

According to the spin motion characteristics of angular contact ball bearings,and considering the elastohydrodynamic lubrication(EHL)effect,the EHL model of angular contact ball bearings considering spin motion was built.The multi-grid method was used to solve the elastic deformation,and the finite difference method was used to solve the Reynolds equation iteratively to obtain a more accurate numerical solution.The effects of spin motion on bearing oil film pressure,thickness and oil film stiffness were analyzed under different Hertz contact pressure and surface roughness of raceway.The results show that when considering spin motion,with the increase of Hertz contact pressure and spin angular velocity,the oil film thickness is decreased and the oil film pressure is increased,and the oil film pressure area is slender and close to the contact center.With the increases of the surface roughness amplitude of raceway,the film pressure and film thickness fluctuate,and when considering spin motion,the oil film thickness is decreased obviously and the local pressure peak of the oil film is larger.The film stiffness is decreased with the increase of entrainment velocity and lubricating viscosity,and the value of oil film stiffness is increased when considering spin motion.As the spin angle velocity increases,the film stiffness is increased gradually.