The Influence of Lubricant Compressibility on the Performance of the 120 Degree Partial Journal Bearing

[+] Author and Article Information
E. J. Gunter

Department of Mechanical Engineering, University of Virginia, Charlottesville, Va.; The Franklin Institute, Philadelphia, Pa.

J. of Lubrication Tech 89(4), 473-481 (Oct 01, 1967) (9 pages) doi:10.1115/1.3617035 History: Received August 01, 1966; Online July 11, 2011


This paper discusses the characteristics of the 120 deg bearing as the compressibility parameter Λ is increased from 0 to ∞. At low values of Λ and light loads, the gas bearing behaves as an incompressible lubricated bearing. Curves are developed to show under what conditions of bearing loading, film thickness, and speed the partial gas bearing may be treated by the incompressible theory. The compressibility parameter Λ has a considerable effect on the proper selection of the shoe pivot position and bearing clearance ratio for both maximum load capacity and minimum coefficient of friction. It is shown that the bearing clearance ratio and pivot location can vary considerably and still maintain close to optimum conditions at low compressibility numbers. At higher compressibility numbers, the choice of pivot location has a substantial effect on the bearing load capacity and coefficient of friction. Also discussed are the optimum design ranges of the compressibility number Λ.

Copyright © 1967 by ASME
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