Accession Number : ADA257204

Title :   Development of a Full-Scale Transmission Testing Procedure to Evaluate Advanced Lubricants.

Descriptive Note : Technical publication,

Corporate Author : NATIONAL AERONAUTICS AND SPACE ADMINISTRATION CLEVELAND OH LEWIS RESEARCH CEN TER

Personal Author(s) : Lewicki, David G. ; Decker, Harry J. ; Shimski, John T.

Report Date : AUG 1992

Pagination or Media Count : 25

Abstract : Experimental tests were performed on the OH-58A helicopter main-rotor transmission in the NASA Lewis 500-hp Helicopter Transmission Test Stand. The testing was part of a joint Navy/NASA/Army lubrication program to develop a separate lubricant for gearboxes that would improve life and load-carrying capacity. The goal of the experiments was to develop a testing procedure using a MIL-L-23699 base reference oil to fail certain transmission components, and then to run identical tests with improved lubricants and demonstrate improved performance. The tests were directed at failing components that have given the Navy problems because of marginal lubrication. These failures included mast-shaft bearing micropitting, sun gear and planet bearing fatigue, and spiral bevel gear scoring. More than 900 hr of total run time were accumulated for these tests. Some success was achieved in developing a testing procedure to produce sun gear and planet bearing fatigue failures. Only marginal success was achieved in producing mast-shaft bearing micropitting and spiral bevel gear scoring.

Descriptors :   *LOW TEMPERATURE LUBRICANTS, HELICOPTERS.

Subject Categories : Lubricants and Hydraulic Fluids

Distribution Statement : APPROVED FOR PUBLIC RELEASE