The Minimum Film Thickness in Line Contacts During Reversal of Entrainment

[+] Author and Article Information
C. J. Hooke

School of Manufacturing and Mechanical Engineering, The University of Birmingham, Birmingham B15 2TT U.K.

J. Tribol 115(1), 191-199 (Jan 01, 1993) (9 pages) doi:10.1115/1.2920975 History: Received February 13, 1992; Revised June 01, 1992; Online June 05, 2008


In contacts, such as cams, non-involute gears and shaft seals, where the direction of entrainment reverses during the operating cycle, the minimum film thickness is typically found just after the reversal. This paper shows that this minimum film thickness is determined by the rate of change of the entraining velocity and by the fluid and surface properties. For line contacts, four regimes of lubrication are found—as for the steady-state situation—and expressions for the film thickness in each regime are developed. This enables an outline design chart for the minimum film thickness to be constructed. It is shown that this information, together with the steady-state predictions is sufficient to determine the variation of film thickness with time in most situations where load, radius of curvature, and entraining velocity vary.

Copyright © 1993 by The American Society of Mechanical Engineers
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