线接触热弹流润滑膜的最小膜厚公式

A New Minimum Film Thickness Formula of TEHL Line Contacts

本文使用Ree-Eyring流变模型来描述润滑油的非牛顿性质,求得了关于线接触热弹流润滑问题的百余组完全数值解.结果显示,接触曲率半径对油膜有重要影响,但润滑剂的流变性质在大滑滚比中轻载工况下对油膜的影响不大,条件是在分析中使用准确的粘压粘温关系式.本文系统地考察了载荷、卷吸速度、滑滚比、综合曲率半径等参数对线接触热弹流润滑膜的压力分布、温度分布、摩擦系数和油膜厚度的影响,提出了最小膜厚的新公式.

More than a hundred cased of full numerical solution to the steady state thermal elastohydrodynamic lubrication problem in line contacts were obtained by using the Ree-Eyring rheological model to describe the non-Newtonian properties of the lubricant. The results show that, the effective curvature radius at the contact point is very important to the behavior of the TEHL film, but, the rheological properties of the lubricant is of little importance when the sliding/rolling ratio is large enough and the load is not heavy, on condition that more accurate viscosity-pressure-temperature relationship proposed by Roelands is employed in the analysis. The effects of load, entraining velocity, sliding/rolling ratio and the effective curvature radius on the pressure distribution, temperature distribution, friction coefficient and film thickness were investigated and a new minimum film thickness formula is proposed.