A Numerical Analysis for Piston Skirts in Mixed Lubrication: Part II—Deformation Considerations

[+] Author and Article Information
Dong Zhu, Yuan-Zhong Hu, Herbert S. Cheng

Center for Engineering Tribology, Northwestern University, Evanston, Illinois 60208

Takayuki Arai, Kyugo Hamai

Engine and Powertrain Research Laboratory, Central Engineering Laboratories, Nissan Motor Company, Yokosuka, 237 Japan

J. Tribol 115(1), 125-133 (Jan 01, 1993) (9 pages) doi:10.1115/1.2920965 History: Received February 14, 1992; Revised June 01, 1992; Online June 05, 2008


This paper presents a mathematical model for piston skirts in mixed lubrication. It takes into account the effects of surface waviness, roughness, piston skirt surface profile, bulk elastic deformation and thermal distortion of both piston skirts and cylinder bore on piston motion, lubrication and friction. The corresponding computer program developed can be used to calculate the entire piston trajectory and the hydrodynamic and contact friction forces as functions of crank angle under engine running conditions. Complete distributions of the oil film thickness and elastic deformation as well as the hydrodynamic and contact pressures can also be given at any crank angle if needed. This paper is the second part of a series of two papers. The first part (Basic Modeling), presented earlier by Zhu et al. (1991), gave the basic formulation and some preliminary results without bulk deformation considerations. In the present part, the three-dimensional finite element method is used to calculate so-called influence coefficient matrices. These matrices are repeatedly used to compute bulk elastic deformations of piston skirts. Results for 12 different cases are presented, and discussions are given focusing on the influences of elastic and thermal deformations on piston motion, lubrication and friction. An attempt to compare the calculated friction with experimental data is made, and agreement appears good for the two available cases. The computer program presented should be a useful tool for piston design and development.

Copyright © 1993 by The American Society of Mechanical Engineers
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