Abstract
The behavior of elastohydrodynamic lubrication (EHL) films is directly observed with all oil having rather high pressure-viscosity coefficient under conditions of rolling or sliding reciprocating motion using the optical interferometry technique. The EHL conjunction is formed by an oscillating glass disk and a steel ball having a transversely oriented long bump and a groove. Under pure rolling conditions, the effects of the surface irregularity is localized to a region around it. Under pure sliding conditions, each bump and groove which stays at the entrance of the EHL conjunction causes a reduction ill film thickness. Its reduction rate is larger for the bump than for the groove. It has however been found that under pure sliding reciprocation with a short length of stroke, the collapse of the oil film and consequently the surface damage easily occur when the groove exists in the inlet of the contact.
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