The Effects of a Transversely Oriented Bump and Groove on Reciprocating EHL Films

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...

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Bibliographic Details
Published inTransactions of the Japan Society of Mechanical Engineers Series C Vol. 65; no. 638; pp. 4205 - 4212
Main Authors NISHIKAWA, Hiroshi, KANETA, Motohiro
Format Journal Article
LanguageJapanese
Published The Japan Society of Mechanical Engineers 1999
Subjects
Bump
Elastohydrodynamic Lubrication
Groove
Machine Element
Reciprocating Motion
Surface Roughness
Tribology
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Summary: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.
ISSN:0387-5024
1884-8354
DOI:10.1299/kikaic.65.4205