In a motorcycle engine, the tappets convert the rotating motion of the cams to the pitching motion of the valves, and they slide with the cams at a high speed under high pressure. Reducing the friction between the tappets and the cams would increase the power of the engine.We studied a way to reduce the coefficient of friction between tappets and cams by applying a hard thin coating of DLC, MoS2, CrN, or TiN to the tappets. We investigated the adhesion of the coatings with a scratch test and their tribological properties with a ball-on-disk test. We then examined their durability with an engine stand test. We concluded that a tappet coated with DLC effectively reduces friction at the cam and tappet interface and is sufficiently durable to be applied to actual motorcycle engines.


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    Title :

    APPLYING HARD THIN COATINGS TO TAPPETS TO REDUCE FRICTION


    Additional title:

    Sae Technical Papers


    Contributors:
    Kodai, A. (author) / Inukai, T. (author) / Mori, T. (author)

    Conference:

    Small Engine Technology Conference & Exposition ; 2001



    Publication date :

    2001-12-01




    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English




    Applying hard thin coatings to tappets to reduce friction

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