弹性流体动力润滑状态下滚动轴承摩擦的分析

基于非牛顿弹性流体动力润滑(弹流润滑)点接触问题的数值求解方法,对深沟球轴承滚动体与滚道椭圆接触的稳态与瞬态润滑问题进行了分析.依据油膜压力与油膜厚度的数值计算结果,讨论了接触表面粗糙度、表面几何形态(粗糙表面峰谷高度)、滑滚比、接触力以及滚动速度等参数的改变对润滑深沟球轴承摩擦系数的影响.结果表明:表面粗糙度的改变对摩擦系数的影响较小;粗糙度一定时,表面几何形态的差别对摩擦系数影响较小;摩擦系数随着滑滚比的提高而增大;接触力与滚动速度的提高导致摩擦系数增大.

Analysis of Elastohydrodynamic Lubrication Friction of Rolling Element Bearing

Based on a set of full non-Newtonian elastohydrodynamic lubrication (EHL) point contact numerical simulation method， the steady and transient EHL characteristics at ball element and raceway elliptical contact in deep groove ball bearing were investigated. According to the results of film pressure and thickness， the effects of surface roughness， surface geometrical morphology (rough surface heights)， slide-to-roll ratio， contact load and rolling velocity on the friction coefficient of deep groove ball bearing were discussed. The results show that the effect of surface roughness on the friction coefficient is negligible， while different surface geometrical morphologies have weak influence on the friction coefficient. The friction coefficient increases with the increase of slide-to-roll ratio and the improvement of the contact force and rolling speed lead to the increase of the friction coefficient.