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