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Elastohydrodynamic Lubrication and Wear of Cams Bearing Against Cylindrical Tappets
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English
Abstract
This paper offers a theoretical treatment of the lubrication of a cam bearing against a cylindrical reciprocating tappet. The tappet lift, velocity and acceleration are specified as a function of camshaft angle, and the effect of variations in the curvature of the cylindrical face of the tappet is explored, the cam form being modified to maintain a constant tappet lift curve. A certain tappet curvature minimises the Hertzian pressure on the cam nose, but affords very poor lubrication conditions. To avoid high wear it is therefore necessary to purchase better lubrication at the sacrifice of higher Hertzian stresses.
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Citation
Dyson, A., "Elastohydrodynamic Lubrication and Wear of Cams Bearing Against Cylindrical Tappets," SAE Technical Paper 770018, 1977, https://doi.org/10.4271/770018.Also In
References
- Müller R. “The Effect of Lubrication on Cam and Tappet Performance” Motor Tech. Z 27 58 1966
- Dyson A. Naylor H. “Application of the Flash Temperature Concept to Cam and Tappet Wear Problems” Inst. Mech. Engrs. Proc. Auto. Div. No. 8 225 280 1960-61
- Greenwood J.A. “Presentation of Elastohydrodynamic Film Thickness Results” J. Mech. Eng. Sci. 11 2 128 1969
- Dudley W.M. “New Methods in Cam Design” SAE Quart. Trans. 2 19 1948