TRACTION IN EHL UNDER PURE SLIDING RECIPROCATION WITH CYCLIC IMPACT LOADING

The frictional traction behavior of elastohydrodynamic contacts under pure sliding reciprocation with and without cyclic impact loading is studied using an optical interferometry device. In the full elastohydrodynamic lubrication regime, the traction under simple reciprocation is almost constant in a wide range of sliding velocity, and its value can be estimated from that under unidirectional conditions. It is also found that the thick oil film entrapped between the contacting surfaces by impact loading can reduce the traction. The reduction ratio of traction depends on the frequency of impact loading and the length of reciprocation.