This content is not included in
your SAE MOBILUS subscription, or you are not logged in.
Rheological Properties of Engine Crankcase and Gear Oil Components in Elastohydrodynamic Oil Films
Annotation ability available
Sector:
Language:
English
Abstract
Techniques are described by which the response of viscosity to both pressure and shear may be determined from measurements of elastohydrodynamic oil film thickness. The methods are applied to three aspects of lubricant behaviour. The response of viscosity to pressure is first determined for a range of mineral, hydrocracked, polyalphaolefin and ester base stocks. Changes in this property when a dispersant/inhibitor additive package is introduced are then examined to determine whether relationships can be established between base oil and solution properties. A relatively simple outcome would allow the properties of commercial lubricants to be estimated from a much narrower range of base oil data. Finally, the response of a polymeric viscosity modifier to the high shear regime of the elastohydrodynamic inlet zone is investigated. The behaviour of the polymer is shown to depend on the relationship between polymer and base oil compositions.
Recommended Content
Authors
Citation
Moore, A., Cooper, D., and Robinson, T., "Rheological Properties of Engine Crankcase and Gear Oil Components in Elastohydrodynamic Oil Films," SAE Technical Paper 941977, 1994, https://doi.org/10.4271/941977.Also In
References
- Choi J-K Lee J-H Han D-C “Oil film thickness in engine main bearings: comparison between calculation and experiment by total capacitance method” SAE 922345 1992
- Lodge A S “A new method of measuring multigrade oil shear elasticity and viscosity at high shear rates” SAE 872043 1987
- Bates T W Williamson B Spearot J A Murphy C K “A correlation between engine oil rheology and oil film thickness in engine journal bearings” SAE 860376 1986
- Sorab J Holdeman H A Chui G K “Viscosity prediction for multigrade oils” SAE 932833 1993
- Johnston G J Wayte R Spikes H A “The measurement and study of very thin lubricant films in concentrated contacts” S.T.L.E. Trans. 34 187 194 1991
- Cooper D Moore A J “Application of the ultra-thin elastohydrodynamic oil film thickness technique to the study of automotive engine oils” Wear 175 93 105 1994
- Barus C “Isothermals, isopiestics and isometrics relative to viscosity” American Journal of Science 45 87 1893
- Hamrock B J Dowson D “Isothermal elastohydrodynamic lubrication of point contacts” Trans. A.S.M.E. 264 276
- Gohar R Cameron A “The mapping of elastohydrodynamic contacts” A.S.L.E. Trans. 10 215 225 1967
- Gunsel S Aderin M Spikes H A “In-situ measurement of ZDDP films in concentrated contacts” Tribology 2000, 8th International Colloquium of the Technical Academy of Esslingen 1992
- “Viscosity and density of over 40 lubricating fluids of known composition at pressures to 150,000 psi and temperatures to 425°F” A.S.M.E. Pressure-Viscosity Report 1953
- Spikes H A “A thermodynamic approach to viscosity” STLE Preprint No. 88-TC-6C-2 1988
- Westlake F J Cameron A “Optical elastohydrodynamic fluid testing” ASLE Trans. 15 81 95 1972
- Dobson G R “Analysis of high shear rate viscosity data for engine oils” Tribology International 195 198 1981
- Wright B van Os N M Lyons J A “European activity concerning engine oil classification - Part IV - the effects of shear rate and temperature on the viscosity of multigrade oils” SAE 830027 1987
- Cross M M J. Appl. Polymer Science 13 765 774 1969