An Experimental Study of Grease in Elastohydrodynamic Lubrication

[+] Author and Article Information
S. Y. Poon

Engineering Department, University of Cambridge, Cambridge, England

J. of Lubrication Tech 94(1), 27-34 (Jan 01, 1972) (8 pages) doi:10.1115/1.3451631 History: Received March 16, 1971; Revised June 06, 1971; Online October 18, 2010


The formation of a lubricating film by grease in conditions pertinent to elastohydrodynamic lubrication is studied in a disk machine, and the thickness measured by means of a magnetic reluctance technique. The greases examined are three lithium hydroxystearate greases, of different soap structures and soap contents, a low temperature sodium-based grease, and a high temperature clay-based grease, all in mineral oils. The film thickness of greases in EHL differs from that of pure mineral oils in one important aspect: with one charge of the lubricant the thickness decreases continuously with time. The time-dependent behavior of greases is examined in relation to the thickener structure, viscosity of the base oil, and the conditions of the inlet zone.

Copyright © 1972 by ASME
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