低速下润滑接触区补充供油机制的研究

在滚动轴承运行的过程中,滚道上的润滑剂在滚动体的反复碾压下,厚度不断减小,轴承最终进入乏油润滑状态.为了解释长期工作在乏油条件下的轴承依旧能够保持较长时间的良好工作状态,有必要研究在轴承中是否存在某种自发的补充供油机制.本文作者基于球盘接触模型,分别考虑毛细力和分离压力在润滑油迁移过程中的作用,建立赫兹接触区附近油层分布模型,并以此修正弹流计算中的入口供油条件,采用统一Reynolds方程法计算在静止或低速条件下的润滑油膜厚度和压力分布,研究毛细力和分离压力的补充供油机制对润滑条件的改善作用.

Oil Replenishment Mechanism of Lubricated Contact at Low Speed

As the lubricant layer on the raceway surface is constantly rolled and rolled by the rolling elements when a rolling bearing is in operation, its thickness gradually decreases and the rolling bearing consequently falls into a starved condition. In order to explain why a rolling bearing can still operate properly under staved condition for a long time, it is necessary to explore if there are some spontaneous replenishment mechanism in the rolling bearing. This paper built a distribution model of lubricant around the Hertz contact region with the consideration of the effect of capillarity and disjoining pressure on the mobility of lubricant based on the ball-disc contact model; then it is used to modify the EHL inlet oil supply condition. With this inlet condition, the unified Reynolds approach is utilized to simulate the film thickness and pressure distribution in a static or low-speed condition. The results show how the replenishment mechanism of capillarity and disjoining pressure improve the lubrication performance.