Optimal Speed Sharing Characteristics of a Series-Hybrid Bearing

[+] Author and Article Information
L. J. Nypan

California State University, Northridge, Calif.

H. W. Scibbe, B. J. Hamrock

Lewis Research Center, Cleveland, Ohio

J. of Lubrication Tech 95(1), 76-81 (Jan 01, 1973) (6 pages) doi:10.1115/1.3451740 History: Received February 03, 1972; Revised July 10, 1972; Online October 18, 2010


A series-hybrid bearing assembly consisting of a conical hydrostatic fluid-film bearing and a ball bearing is described. Computer studies are used to predict friction torque and life characteristics of a 150-millimeter ball bearing. A conical hydrostatic fluid-film bearing is designed for minimum friction and maximum speed reduction of the ball-bearing component of the series-hybrid bearing. At a thrust load of 4000 lb and speeds corresponding to DN (bearing bore in millimeters times shaft speed in rpm) values of 3 and 4 million, ball-bearing speed may be reduced by 30 percent. This speed reduction corresponds to ball-bearing fatigue life improvement factors of 3.4 at 3 million DN and 5.9 at 4 million DN. An oil flow rate at 18.2 lb per min is required to maintain a fluid-film thickness of 0.001 in. in the hydrostatic bearing.

Copyright © 1973 by ASME
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