滑滚条件下定量润滑状态与润滑剂回填效应试验观察

Observation of Lubrication State and Lubricant Replenishment under Sliding-Rolling Motions with Single-Charging Amount

采用球-盘点接触光干涉油膜与摩擦力测量装置观察了滑滚条件下接触区润滑状态与润滑剂回填效应.结果显示,在定量供油和恒定滑滚比下,不同供油量使接触区呈现出从边界润滑状态向弹流润滑状态的不同转化趋势,非接触回填机制是其诱因;在恒定卷吸速度下,随着滑滚比从负值向正值变化,入口距离减小、乏油宽度增加,接触区两表面润滑剂回填时间的差别是其主要原因;完全乏油条件下,接触回填机制对局部润滑油膜建立发挥明显作用.

Using a ball-on-disc film and friction measurement apparatus, the lubrication states, and lubricant replenishment behaviors were experimentally observed under sliding-rolling conditions with single-charging amount.The results showed that for a fixed sliding-rolling-ratio(SRR), the transitions of contacts from boundary lubrication to elastohydrodynamic lubrication(EHL) were found, the trends of which were highly dependent on the lubricant charging amount. The out-of-contact replenishment mechanism was responsible for the transitions. Given entrainment velocity,the inlet distance decreased and starvation width broadened with variations of SRR from a negative value to a positive value, which was attributed to the large differences of replenishment time. Under fully starvation states, the contact replenishment mechanism played a significant role in the establishment of local EHL films.