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Some limitations in applying classical EHD film thickness formulas to a high-speed bearingElastohydrodynamic film thickness was measured for a 20-mm ball bearing using the capacitance technique. The bearing was thrust loaded to 90, 448, and 778 N. The corresponding maximum stresses on the inner race were 1.28, 2.09, and 2.45 GPa. Test speeds ranged from 400 to 14,000 rpm. Film thickness measurements were taken with four different lubricants: (a) synthetic paraffinic, (b) synthetic paraffinic with additives, (c) neopentylpolyol (tetra) ester meeting MIL-L-23699A specifications, and (d) synthetic cycloaliphatic hydrocarbon traction fluid. The test bearing was mist lubricated. Test temperatures were 300, 338, and 393 K. The measured results were compared to theoretical predictions using the formulas of Grubin, Archard and Cowking, Dowson and Higginson, and Hamrock and Dowson. There was good agreement with theory at low dimensionless speed, but the film was much smaller than theory predicts at higher speeds. This was due to kinematic starvation and inlet shear heating effects.
Document ID
19810034263
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Coy, J. J.
(U.S. Army, Propulsion Laboratory, Cleveland Ohio, United States)
Zaretsky, E. V.
(NASA Lewis Research Center Cleveland, Ohio, United States)
Date Acquired
August 11, 2013
Publication Date
August 1, 1980
Subject Category
Engineering (General)
Report/Patent Number
ASME PAPER 80-C2/LUB-13
Meeting Information
Meeting: Century 2 International Lubrication Conference
Location: San Francisco, CA
Country: US
Start Date: August 18, 1980
End Date: August 21, 1980
Sponsors: American Society of Lubrication Engineers, American Society of Mechanical Engineers
Accession Number
81A18667
Distribution Limits
Public
Copyright
Other

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