Endurance and Failure Characteristic of Main-Shaft Jet Engine Bearing at 3 × 106 DN

[+] Author and Article Information
E. N. Bamberger

General Electric Co., Evendale, Ohio

E. V. Zaretsky

NASA Lewis Research Center, Cleveland, Ohio

H. Signer

Industrial Tectonics, Inc., Compton, Calif.

J. of Lubrication Tech 98(4), 580-585 (Oct 01, 1976) (6 pages) doi:10.1115/1.3452940 History: Received December 15, 1975; Revised February 23, 1976; Online October 20, 2010


Groups of thirty 120-mm bore angular-contact ball bearings were endurance tested at a speed of 12 000 and 25 000 rpm (1.44 × 106 and 3.0 × 106 DN) and a thrust load of 66 721 N (5000 lb). The bearings were manufactured from a single heat of VIM-VAR AISI M-50 steel. At 1.44 × 106 and 3.0 × 106 DN, 84 483 and 74 800 bearing test hours were accumulated, respectively. Test results were compared with similar bearings made from CVM AISI M-50 steel run under the same conditions. Bearing lives at speeds of 3 × 106 DN with the VIM-VAR AISI M-50 steel were nearly equivalent to those obtained at lower speeds. A combined processing and material life factor of 44 was found for VIM-VAR AISI M-50 steel. Continuous running after a spall has occurred at 3.0 × 106 DN can result in a destructive fracture of the bearing inner race.

Copyright © 1976 by ASME
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