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Engine Friction Modeling
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English
Abstract
This paper describes the results of using the Southwest Research Institute (SwRI) engine friction model to examine the effects of changing certain design parameters on the friction of a gasoline engine. The paper gives the results of an examination of the effects of changing the main and cam-shaft bearing aspect ratio on the friction of those bearings, and the effect of the tension of the piston rings, and the gas loading on them.
The model predicts that the friction of the piston rings is the highest single component in the friction, except at high engine speeds, where the predicted windage was greater. Next, after the piston rings, was the piston skirt friction. The remaining components were relatively small, and in order of importance were the accessories, the cam bearing friction, cam/tappet friction, the main bearing, the crank pin, and oscillatory friction in the valve train, in that order.
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Citation
Thring, R., "Engine Friction Modeling," SAE Technical Paper 920482, 1992, https://doi.org/10.4271/920482.Also In
References
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- Shigley Mitchell Mechanical Engineering Design McGraw-Hill Book Company, Inc. New York, NY 1983 515 548
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- Ocvirk, F.W. “Short-Bearing Approximation For Full Journal Bearings,” October 1952
- Furuhama, S. “A Dynamic Theory of Piston-Ring Lubrication (1st Report, Calculation),” Bulletin of JSME 2 7 1959
- Taylor, C.F. “The Internal Combustion Engine in Theory and Practice,” The MIT Press 1979