THE EFFECT OF LUBRICANT ELASTICITY ON JOURNAL BEARING PERFORMANCE UNDER STATIC LOAD
This paper presents experimental measurements of oil film thickness for a statically loaded journal bearing with single-grade, polymer-free engine oils and SAE 10W40 polymer-containing engine oils under hydrodynamic lubrication conditions. Measured minimum film thickness was correlated with a bearing Sommerfeld number based on actual high shear rate viscosities with no significant difference being observed between polymer-free and polymer-containing oils. However, a significant decrease in bearing attitude angle was observed for a number of polymer-containing oils compared with polymer-free oils at the same Sommerfeld number. Using measured values for eccentricity, attitude angle and high shear rate viscosities, the total friction couple was calculated at various Sommerfeld numbers with no difference being found between polymer-containing and polymer-free oils. This was expected since theoretically the contribution to friction due to attitude angle is small compared with that due to viscosity.
- Find a library where document is available. Order URL: http://worldcat.org/issn/01487191
- Fuels and Lubricants Meeting San Francisco, California, October 31-November 3. 1983.
Warrendale, PA United States 15096
- Os, N van
- Garcia-Franco, C A
- Gottenberg, W G
- Tripp, H A
- Publication Date: 1983
- Features: Appendices; Figures; References; Tables;
- Pagination: 14 p.
- TRT Terms: Elasticity (Mechanics); Engine oils; Journal bearings; Measurement; Oil spills; Polymers; Shear rate; Static loads; Thickness; Thin films; Viscosity
- Old TRIS Terms: Oil-film-thickness
- Subject Areas: Safety and Human Factors;
- Accession Number: 00387441
- Record Type: Publication
- Source Agency: National Highway Traffic Safety Administration
- Report/Paper Numbers: SAE 831690, HS-036 798
- Files: HSL, USDOT
- Created Date: Aug 30 1984 12:00AM