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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    Title :

    Elastohydrodynamic Lubrication and Wear of Cams Bearing Against Cylindrical Tappets


    Additional title:

    Sae Technical Papers


    Contributors:
    Dyson, A. (author)

    Conference:

    1977 International Automotive Engineering Congress and Exposition ; 1977



    Publication date :

    1977-02-01




    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English




    Elastohydrodynamic Lubrication and Wear of Cams Bearing against Cylindrical Tappets

    Dyson,A. / Shell,Thornton Res.Cent.,GB | Automotive engineering | 1977


    CAMS AND TAPPETS

    CROSS, GEORGE S. | SAE Technical Papers | 1912


    Cams and tappets : A survey of information

    British Technical Council of the Motor and Petroleum Industries, The Cam and Tappet Project Group | TIBKAT | 1972



    Valve tappets

    Engineering Index Backfile | 1945