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RESEARCH PAPERS

Effects of Ultra-Clean and Centrifugal Filtration on Rolling-Element Bearing Life

[+] Author and Article Information
S. H. Loewenthal

NASA Lewis Research Center, Cleveland, Ohio 44135

D. W. Moyer

Tribon Bearing Company, Cleveland, Ohio 44135

W. M. Needelman

Pall Corporation, Glen Cove, N.Y. 11542

J. of Lubrication Tech 104(3), 283-291 (Jul 01, 1982) (9 pages) doi:10.1115/1.3253194 History: Received March 10, 1981; Online November 13, 2009

Abstract

Fatigue tests were conducted on groups of 65-millimeter bore diameter deep-groove ball bearings in a MIL-L-23699 lubricant under two levels of filtration. In one test series, the oil cleanliness was maintained at an exceptionally high level (better than a class of “00” per NAS 1638) with a 3 micron absolute barrier filter. These tests were intended to determine the “upper limit” in bearing life under the strictest possible lubricant cleanliness conditions. In the tests using a centrifugal oil filter, contaminants of the type found in aircraft engine filters were injected into the filters’ supply line at 125 milligrams per bearing-hour. “Ultra-clean” lubrication produced bearing fatigue lives that were approximately twice that obtained in previous tests with contaminated oil using 3 micron absolute filtration and approximately three times that obtained with 49 micron filtration. It was also observed that the centrifugal oil filter had approximately the same effectiveness as a 30 micron absolute filter in preventing bearing surface damage.

Copyright © 1982 by ASME
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