Since the intake and exhaust valve timings that provide the best fuel economy, idle stability, or highest power change according to the engine operating zone, a variable valve timing system is very beneficial.Also, roller followers, which reduce mechanical friction loss of a valve train mainly at low engine speed, are commonly used to improve fuel economy in urban driving conditions. This paper presents a newly developed 4-valve variable-valve-timing mechanism with roller followers.Different intake- and exhaust-valve timings and lifts are selected independently, depending upon whether engine speed is low or high.Durability tests of running at maximum engine speed and switching between low- and high-speed cams were conducted and good test results were obtained.


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    Titel :

    A Newly Developed Variable Valving Mechanism with Low-Mechanical Friction


    Weitere Titelangaben:

    Sae Technical Papers


    Beteiligte:
    Shibano, Kenji (Autor:in) / Watanabe, Kenzo (Autor:in) / Kamimaru, Shinji (Autor:in) / Yamada, Takemasa (Autor:in)

    Kongress:

    International Congress & Exposition ; 1992



    Erscheinungsdatum :

    01.02.1992




    Medientyp :

    Aufsatz (Konferenz)


    Format :

    Print


    Sprache :

    Englisch




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