Accession Number : ADA290506
Title : Evaluation of the EHL Film Thickness and Extreme Pressure Additives on Gear Surface Fatigue Life.
Descriptive Note : Technical memo.,
Corporate Author : NATIONAL AERONAUTICS AND SPACE ADMINISTRATION CLEVELAND OH LEWIS RESEARCH CEN TER
Personal Author(s) : Townsend, Dennis P. ; Shimski, John
PDF Url : ADA290506
Report Date : JUL 1994
Pagination or Media Count : 10
Abstract : Surface pitting fatigue life tests were conducted with seven lubricants, using AISI 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)
Descriptors : *AIRCRAFT, *FATIGUE LIFE, *LUBRICANTS, *GEARS, *TRANSMISSION GEARS, THICKNESS, THERMAL STABILITY, GAS TURBINES, HELICOPTERS, WEAR, ROLLER BEARINGS, ESTERS, FRICTION, VISCOSITY, PITTING.
Subject Categories : Aircraft
Lubricants and Hydraulic Fluids
Machinery and Tools
Distribution Statement : APPROVED FOR PUBLIC RELEASE