In engines having an inline four cylinder DOHC configuration, the rotational vibrations of camshaft increase at high engine speeds above 10000 rpm, causing an increase of tension in the cam chain. It is therefore difficult to realize an optimum designing of a cam chain system when the durability has to be taken into considerations. Using the simulation we analyzed in this research how the rotational vibrations and tension increase at high engine speeds in an inline four cylinder DOHC engine. As its consequent, it is understood that the increases of rotational vibrations and tension caused by the resonance of the spring mass vibration system in which the cam chain serves as springs and the camshafts as the equivalent masses. Also it is found out that the vibration system is of a unique non-linear type in which the resonance of the fourth order frequency is also excited by the crankshaft torque fluctuations of the second order frequency. Furthermore, it is uncovered that the natural frequency of the vibration system shifts from a value to another with the shifting point at the engine speed where the tensioner resonates.


    Access

    Check access

    Check availability in my library

    Order at Subito €


    Export, share and cite



    Title :

    Analysis of Rotational Vibration Mechanism of Camshaft at High Engine Speed in Engines with In-Line Four-Cylinder DOHC Configuration


    Additional title:

    Sae Technical Papers


    Contributors:

    Conference:

    SAE/JSAE Small Engine Technology Conference ; 2018



    Publication date :

    2018-10-30




    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English




    Saturn DOHC and SOHC Four Cylinder Engines

    Reilly, Donald J. / Dugdale, Peter H. / Andersen, Richard P. et al. | SAE Technical Papers | 1991


    Saturn DOHC and SOHC four cylinder engines

    Reilly,D.J. / Andersen,R.P. / Casparian,R.J. et al. | Automotive engineering | 1991


    Nissan's New In-Line DOHC Six Cylinder Engine and its Development

    Ito, Kosuke / Kadowaki, Shunichi / Ishida, Yoshiyuki et al. | SAE Technical Papers | 1986


    Performance and Emissions of a Natural Gas-Fueled 16 Valve DOHC Four-Cylinder Engine

    Jääskeläinen, Hannu E. / Wallace, James S. | SAE Technical Papers | 1993


    Performance and emissions of a natural gase-fueled 16 valve DOHC four-cylinder engine

    Jääskeläinen, H.E. / Wallace, J.S. | Tema Archive | 1993