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Equations For Elastohydrodynamic Lubrication Of BearingsEquation for thickness of elastohydrodynamic (EHD) lubricant film in rolling-element bearing reduced to simplified form involving only inside and outside diameters of bearing, speed of rotation, parameter related to type of lubricant, and viscosity of lubricant at temperature of bearing. In addition, experimentally derived graph of EHD-film-thickness-reduction factor as function of contact-lubricant-flow number. Accounts for lubricant starvation within Hertzian contact. Graph relating ratio of minimum film thickness to composite roughness of bearing surfaces and to lubrication-life correction factor also provided. Life-correction factor used to determine resultant life of bearing.
Document ID
19930000289
Acquisition Source
Legacy CDMS
Document Type
Other - NASA Tech Brief
Authors
Zaretsky, Erwin V.
(NASA Lewis Research Center, Cleveland, OH.)
Date Acquired
August 16, 2013
Publication Date
May 1, 1993
Publication Information
Publication: NASA Tech Briefs
Volume: 17
Issue: 5
ISSN: 0145-319X
Subject Category
Mechanics
Report/Patent Number
LEW-15185
Accession Number
93B10289
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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