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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    Title :

    Piston Thermal Deformation and Friction Considerations


    Additional title:

    Sae Technical Papers


    Contributors:

    Conference:

    SAE International Congress and Exposition ; 1982



    Publication date :

    1982-02-01




    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English




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