Fundamental Research on Gear Lubrication : 3rd Report, Basic Analysis on Dynamic Phenomena of Oil Film

Abstract

Mating of a gear-tooth is intermittent, and various factors, which affect the lubrication characteristic, vary quickly during a tooth mating. Therefore, it is very important to analyze the dynamic phenomena of oil film in order to clarify the mechanism of gear lubrication. The hydro-dynamic squeeze-effect was introduced into the lubrication theory, and the transient performance of oil film caused by discontinuous variation of contact state or load was analyzed. Experimentally, the transient thickness of oil film was measured by using special model disks, and it was found that the results were qualitatively in good agreement with the theoretical results. It is deduced that the dynamic phenomena of oil film can be fundamentally explained by the dynamic lubrication theory into which the squeeze-effect is introduced.