Transient elastohydrodynamic lubrication analysis of spur gear running-in considering effects of solid particles

Abstract

Abstract-The elastohydrodynamic lubrication model considering solid particles was set up. Taking effect of solid particles into account, the Reynolds equation was deduced. The elastohydrodynamic lubrication analysis of spur gear running-in was completed considering time-variant effect. Results show that oil film pressure in region 2 where particle is located increases dramatically but oil film thickness in region 2 decreases thinking about effects of solid particles. When particle size becomes greater oil film pressure increases obviously, oil film thickness diminishes. The minimum film thickness and maximum film pressure both diminish considering effects of solid particles.

Numerical investigation of elastohydrodynamic contacts subjected to harmonic load variation

“…Therefore, in such elements, the assumption of a steady-state solution is inappropriate to study both film thickness and contact pressure to protect such components form direct contact and damage. A series of theoretical and experimental studies of the effect of transient conditions on the behavior of lubricated elastohydrodynamic film have been reported in the past for different aspects of transient conditions such as variation due to surface velocity (Ehret et al, 1999;Vahid et al, 2001;Kushwaha and Rahnejat, 2004;Zhang and Glovnea, 2015;Petr et al, 2015;Al-Samieh, 2018) and variation due to surface geometry (Venner et al, 1997;Huang et al, 2015;Huang and Wang, 2016). Transient conditions of elastohydrodynamic lubrication subjected to vibration of load have received less attention because of the fact that the load has a small influence upon the steady-state film thickness and the difficult experimental setup.…”