Evaluation of the EHL Film Thickness and Extreme Pressure Additives on GearSurface Fatigue Life

摘要

Surface pitting fatigue life tests were conducted with seven lubricants, usingAISI 9310 spur gears. The test lubricants can be classified as synthetic polyol-esters with various viscosities and additive packages. The lubricant with a viscosity that provided a specific film thickness greater than one and with an additive package produced gear surface fatigue lives that were 8.6 times that for lubricants with a viscosity that provided specific film thickness less than one. Lubricants with the same viscosity and similar additive packages gave equivalent gear surface fatigue lives. (MM).