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Fuel Economy - Contribution of the Rear Axle Lubricant
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English
Abstract
Axle dynamometer tests were carried out to evaluate the effects of rear axle lubricant viscosity-temperature behavior and frictional characteristics on vehicle fuel economy. Using a Ford 9 inch 2.75:1.0 ratio axle, a set of input speed and load conditions was selected to permit simulation of the CVS and EPA highway driving cycles. Lubricant temperature was varied from -30°C to 100°C to simulate seasonal climatic effects. Data obtained for three lubricants differing in viscosity-temperature behavior were interpreted assuming a lubrication model including both elastohydrodynamic and mixed lubrication conditions. From these data, fuel economy projections were made using a vehicle simulation computer program.
The results predict that improvements in vehicle fuel economy on the order of a few percent can be made at low temperatures by use of low viscosity synthetic lubricants, but only small effects are projected for the CVS and EPA highway cycles. Insufficient data were obtained to quantify the contribution of friction modifiers to fuel economy. However, the data indicate under what viscosity values and input conditions friction modifiers will become effective and suggest areas for future evaluation.
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Citation
Willermet, P. and Dixon, L., "Fuel Economy - Contribution of the Rear Axle Lubricant," SAE Technical Paper 770835, 1977, https://doi.org/10.4271/770835.Also In
References
- “Automotive Fuel Savings Through Selected Lubricants” Chamberlain W. B. Sheahan T. J. SAE Paper # 750377 Detroit, Michigan February 24-28 1975 “An Historical Review of Reduction in Fuel Consumption of United States and European Engines with MoS 2 ” Risdon T. J. Gresty D. A. SAE Paper # 750674 , SAE Fuels and Lubricants Meeting Houston, Texas June 3-5 1975 “Stable Colloid Additives for Engine Oils - Potential Improvement in Fuel Economy” Bennington J. C. Cole D. E. Ghirla P. J. Smith R. K. SAE Paper #750675, SAE Fuels and Lubricants Meeting Houston, Texas June 3-5 1975 “Lubricant Viscosity Effects on Fuel Economy” Davison E. D. Haviland M. L. SAE Paper # 750675 , SAE Fuels and Lubricants Meeting Houston, Texas June 3-5 1975 “Lubricant Related Fuel Savings in Short Trip Cold Weather Service” Sheahan T. J. Ronig W. S. SAE Paper # 750676 SAE Fuels and Lubricants Meeting Houston, Texas June 3-5 1975
- “Customer Fuel Economy Estimated From Engineering Tests” Scheffler Charles E. Niepoth George W. SAE paper # 650861 “Selected Lubricants Save Gasoline” Sheahan Thomas J. Annual meeting of the National Petroleum Refiners Association March 23-25 1975 San Antonio, Texas
- Donnelly M. P. private communication
- “A Theory of Involute Gear Lubrication” Dowson D. Higginson G. R. Gear Lubrication” The Institute of Petroleum 61 New Cavendish Street, London, W. 1. 1966