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Oil film thickness measurement and analysis for an angular contact ball bearing operating in parched elastohydrodynamic lubricationThe capacitance method is used to estimate the oil film thickness in the Hertzian contact zone of an angular contact ball bearing operating in parched elastohydrodynamic lubrication. The parched elastohydrodynamic lubrication regime is characterized by a transient film thickness and basic speed ratio (ball spin rate over combined race speed) and the formation of a friction polymer. The experimental apparatus tests 40 mm 108 H ball bearings in the counter rotating race mode at loads of 200 and 300 lb, a film parameter of 1.6 and nominal inner and outer race speeds of 38 and 26 rps, respectively. Experimental results are presented for the capacitance, thickness, and conductance of the oil film as functions of elapsed time and for the basic speed ratios as a function of elapsed time, load, and amount of lubricant applied to the test bearing. Results indicate that a friction polymer formed from the initial lubricant has an effect on the capacitance and basic speed ratio measurements.
Document ID
19870007446
Acquisition Source
Legacy CDMS
Document Type
Thesis/Dissertation
Authors
Hunter, Scott D.
(Case Western Reserve Univ. Cleveland, OH, United States)
Date Acquired
September 5, 2013
Publication Date
September 1, 1986
Subject Category
Chemistry And Materials (General)
Report/Patent Number
E-3152
NAS 1.26:179506
NASA-CR-179506
Accession Number
87N16879
Funding Number(s)
PROJECT: RTOP 505-63-81
CONTRACT_GRANT: NCC3-30
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
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