RESEARCH PAPERS: Design Automation Papers

Coulomb Friction and Optimal Rocker Arm Ratio for High-Speed Cam Systems

[+] Author and Article Information
A. P. Pisano

Mechanical Engineering Dept., University of California, Berkeley, CA 94720

Hong Tao Chen

Systems Control, Inc., Palo Alto, CA 94304

J. Mech., Trans., and Automation 108(3), 340-344 (Sep 01, 1986) (5 pages) doi:10.1115/1.3258737 History: Received January 30, 1986; Online November 19, 2009


The operating speed of a high-speed cam system can be maximized by the proper choice of both kinematic and dynamic parameters of a lumped model. Considering rocker arm ratio as an unconstrained kinematic parameter and Coulomb friction as an unconstrained dynamic parameter, it was found that the camshaft speed at which toss occurred was characterized by several local extrema, all of which were sensitive to the presence of Coulomb friction. For a particular cam system and two separate cam lift curves, design charts have been developed to aid in the choice of optimal rocker arm ratio for maximum operating speed in the presence of Coulomb friction.

Copyright © 1986 by ASME
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