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The Effect of ODC-Free Cleaning Techniques on Bearing Lifetimes in the Parched Elastohydrodynamic RegimeA parched elastohydrodynamic rig was used to determine relative bearing lifetimes as a function of cleaning procedures in a series of accelerated tests. Two ODC-free cleaning procedures (super critical CO2 and ultraviolet-ozone) were compared to a CFC-113 control. Bearings (52100 steel) were run in the counter rotating mode (equivalent to 4600 rpm) with a full complement (i.e. no retainer) and a single charge of lubricant (Krytox 143 AC). Test conditions included: an air atmosphere, 445 N load, approx. 1.0 GPa mean Hertz stress. There was approximately a 50% reduction in life with bearings cleaned with UV/ozone and a 70% reduction in life with SFE CO2 when compared to the Freon control. Possible reasons for these decreases in lifetimes are presented.
Document ID
19970002984
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Jones, William R., Jr. (NASA Lewis Research Center Cleveland, OH United States)
Toddy, Thomas J. (NASA Lewis Research Center Cleveland, OH United States)
Predmore, Roamer (NASA Goddard Space Flight Center Greenbelt, MD United States)
Shogrin, Bradley (Case Western Reserve Univ. Cleveland, OH United States)
Herrera-Fierro, Pilar (Ohio Aerospace Inst. Cleveland, OH United States)
Date Acquired
September 6, 2013
Publication Date
September 1, 1996
Subject Category
Nonmetallic Materials
Report/Patent Number
NASA-TM-107322
E-10425
NAS 1.15:107322
Meeting Information
Meeting: Aerospace Environmental Technology Conference
Location: Huntsville, AL
Country: United States
Start Date: August 6, 1996
End Date: August 8, 1996
Sponsors: NASA Marshall Space Flight Center
Accession Number
97N11763
Funding Number(s)
PROJECT: RTOP 297-40-00
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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