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Development of a full-scale transmission testing procedure to evaluate advanced lubricantsExperimental 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. The objective of the program was to develop a separate lubricant for gearboxes and demonstrate an improved performance in life and load-carrying capacity. The goal of the experiments was to develop a testing procedure to fail certain transmission components using a MIL-L-23699 base reference oil, then run identical tests with improved lubricants and demonstrate performance. The tests were directed at failing components that the Navy has had problems with due to marginal lubrication. These failures included mast shaft bearing micropitting, sun gear and planet bearing fatigue, and spiral bevel gear scoring. A variety of tests were performed and over 900 hours of total run time 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.
Document ID
Acquisition Source
Legacy CDMS
Document Type
Technical Publication (TP)
Lewicki, David G.
(NASA Lewis Research Center Cleveland, OH, United States)
Decker, Harry J.
(NASA Lewis Research Center Cleveland, OH, United States)
Shimski, John T.
(Naval Air Propulsion Test Center Trenton, NJ., United States)
Date Acquired
September 6, 2013
Publication Date
August 1, 1992
Subject Category
Mechanical Engineering
Report/Patent Number
NAS 1.60:3265
Accession Number
Funding Number(s)
PROJECT: RTOP 505-63-36
PROJECT: DA PROJ. 1L1-62211-A-47-A
Distribution Limits
Work of the US Gov. Public Use Permitted.
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