The piston assembly is generally believed to account for a large percentage of the total engine mechanical power loss. Maintaining a proper running skirt profile and skirt-to-bore clearance at operating temperature is essential in piston friction reduction. Pistons for current automotive engines are made of an aluminum alloy which has a thermal expansion coefficient 80% higher than that of the cast iron material commonly used for the engine block. The running clearance under engine operating conditions is, therefore, quite different from the design clearance, and a capability to compute the piston thermal expansion is needed.In this study, a three-dimensional finite element model was developed to calculate the piston operating temperature and the corresponding thermal expansion in the presence of asymmetric structural features such as a translot, a steel strut, and a pin boss. The model can be used to design skirt profiles which have the potential to decrease break-in time, reduce friction, and minimize piston slap.


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    Titel :

    Piston Thermal Deformation and Friction Considerations


    Weitere Titelangaben:

    Sae Technical Papers


    Beteiligte:
    Li, Chin-Hsiu (Autor:in)

    Kongress:

    SAE International Congress and Exposition ; 1982



    Erscheinungsdatum :

    01.02.1982




    Medientyp :

    Aufsatz (Konferenz)


    Format :

    Print


    Sprache :

    Englisch




    Piston thermal deformation and friction considerations

    Li,C.H. / General Motors Res.Lab.,Mech.Res.Dep.,US | Kraftfahrwesen | 1982


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    AE Assoc.Engng.,Rugby,GB | Kraftfahrwesen | 1982


    Friction of piston rings

    Tischbein, H.W. | Engineering Index Backfile | 1945


    Influence of Piston Rotational Motion on Piston Friction

    Watanabe, H. / Miyasaka, H. / Takashima, Y. et al. | British Library Online Contents | 1998


    Measurement of piston and piston ring assembly friction force

    Goto,T. / Aoyama,S. / Nagumo,S. et al. | Kraftfahrwesen | 1985