A Numerical Analysis for the Transient EHL Process of a Cam-Tappet Pair in I. C. Engine

[+] Author and Article Information
Xiaolan Ai, Haiqing Yu

Department of Precision Instrument, Tsinghua University, Beijing, People’s Republic of China

J. Tribol 111(3), 413-417 (Jul 01, 1989) (5 pages) doi:10.1115/1.3261940 History: Received July 08, 1988; Online October 29, 2009


The transient elastohydrodynamic lubrication (EHL) process of cam-tappet pair in I. C. engine is analyzed with a full numerical method. The variations of pressure distribution and film profile as a function of rotation angle of cam shaft provide useful information in evaluating lubrication conditions as well as analyzing failures of contacting surfaces. Results show that the segment in cam contour from φ = 30 to φ = 110 deg is a difficult lubrication range, and surface failure may occur first in this range. This statement was confirmed by preliminary exprimental work conducted in a testing rig.

Copyright © 1989 by ASME
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