TitleMechanism for increase in EHL oil film thickness by formation of submicrometer downsteps beside contact point
SourceMITC2015-pp 173-174
AuthorH. Ishihara, T. Hirayama, T. Matsuoka


The mechanism of the increase in oil film thickness with a steel ball with sub-micrometer downsteps beside the contact point on a ball under pointcontact elastohydrodynamic lubrication (EHL) condition was investigated. The film thickness was measured using a disk-on-ball friction tester with optical interferometry. The Reynolds equation and finite element method were used to calculate the pressure and deformation distributions, respectively. The analytical results showed that the increase in the oil film thickness was due to the ball and disk taking a unique deformed shape. This restricted oil flow from the contact point, causing the film thickness to increase.  


MITC2015-pp 173-174