椭圆接触自旋弹流油膜实验研究

Experimental Research on Spinning Elastohydrodynamic Lubrication Film under Elliptical Contact

设计一种简单的实验方法,通过调节弹流接触中心和旋转中心之间的距离,可获得不同程度的自旋,即得到不同的旋滑比。采用玻璃块-椭圆滚子接触的方式,应用光干涉自旋弹流薄膜测量系统研究界面滑移条件下自旋对弹流油膜的影响。结果表明,随旋滑比的增大,油膜形状失去了经典弹流油膜的对称性;一定偏心距下,随速度和载荷的增加,油膜形状的非对称性都增强,入口凹陷逐渐都变得明显,但油膜厚度变化趋势不同,其中随速度的增加,油膜厚度而增加,且接触区两侧最小膜厚的差值也增加,而随载荷的增加,接触区左侧最小膜厚逐渐减小,右侧最小膜厚先增加后减小。

A novel experimental approach was proposed to obtain different spinning levels. A parameter of spinning-slid- ing ratio was introduced to quantify the spinning effect by adjusting the distance between the contact center to the disc rota- tion axis. Using an optical interferometry system developed for measuring spinning elastohydrodynamic lubrication （EHL） contact, the influence of spinning on EHL films formed by elliptical ball-on-disc contact was studied experimentally. Exper- imental results show that under wall slippage conditions, the film shape no longer maintains its symmetry with spinning sliding ratios increasing. For given eccentricity, the higher the speed and the load, the more asymmetry of the film and the much obvious of the inlet dimple. With the speed increasing, the film thickness increases and the difference of the mini- mum thickness at the two sides becomes obvious. Moreover, the minimum film thickness at the left side drops, but the mini- mum film thickness at the right side increases first and then decreases with loading increasing.