NDLI: Evaluation of a series hybrid thrust bearing at dn values to three million. 2: fabrication and testing

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Evaluation of a series hybrid thrust bearing at dn values to three million. 2: fabrication and testing

Content Provider	NASA Technical Reports Server (NTRS)
Author	Eusepi, M. Winn, L. W.
Copyright Year	1975
Description	Results of tests made to determine the experimental performance of a series hybrid bearing are reported. The bearing consists of a 150 mm ball bearing and a centrifugally actuated, conical, fluid film bearing fitting an envelope with an outer radius of 86.4 mm (3.4 in.) and inner radius of 71 mm (2.8 in.). Tests were conducted up to 16,500 rpm, at which speed an axial load of 15,568 N (3500 lb) was safely supported by the hybrid bearing system. Through the employment of the series hybrid bearing principle, it was possible to reduce the effective ball bearing speed to approximately one-half of the shaft speed. A reduction of this magnitude should result in a tenfold increase in the ball bearing fatigue life. A successful simulation of fluid film bearing lubricant supply failure, performed repeatedly at an operating speed of 10,000 rpm, resulted in complete and smooth change over to full scale ball bearing operation when the oil supply to the fluid film bearing was discontinued. Reactivation of the fluid film supply system produced a flawless return to the original mode of hybrid operation.
File Size	3246524
Page Count	47
File Format	PDF
Alternate Webpage(s)	http://archive.org/details/NASA_NTRS_Archive_19750017119
Archival Resource Key	ark:/13960/t71w0911n
Language	English
Publisher Date	1975-06-01
Access Restriction	Open
Subject Keyword	Mechanical Engineering Fatigue Life Performance Tests Lubrication Ball Bearings Fluid Films Thrust Bearings Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science
Content Type	Text
Resource Type	Technical Report

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