Analysis of Oil-Film Pressure Distribution in Porous Journal Bearings Under Hydrodynamic Lubrication Conditions Using an Improved Boundary Condition

[+] Author and Article Information
Satoru Kaneko, Hiroki I

Department of Mechanical Engineering, Nagaoka University of Technology, Kamitomioka, Nagaoka, 940-21, Japan

Yuji Hashimoto

Toyota Automatic Loom Works Co., Ltd., Nagakusa, Ohfu, Aichi, 474, Japan

J. Tribol 119(1), 171-178 (Jan 01, 1997) (8 pages) doi:10.1115/1.2832454 History: Received February 06, 1996; Revised May 06, 1996; Online January 24, 2008


Pressure distributions in the oil film of a porous journal bearing are investigated theoretically and experimentally under hydrodynamic lubrication conditions. The circumferential boundary condition for the oil-film pressure is obtained by applying an integral momentum equation to the oil-film region in the bearing clearance. The oil-film pressure distributions are numerically solved using this momentum equation and taking into consideration the balance between oil fed into the clearance and that lost from it. The present analysis shows the occurrence of a negative film pressure before the trailing end of the oil-film region. The experimental results confirm the existence of this negative film pressure. Furthermore, the angular position of the trailing end of the oil-film region obtained in the present analysis moves toward the downstream region, yielding better agreement with the measured and calculated film regions than was found in our previous analysis based on the quasi-Reynolds boundary condition.

Copyright © 1997 by The American Society of Mechanical Engineers
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