The noise generation mechanism of a direct-acting valve train such as used in sporty and luxury cars was determined for both mechanical and hydraulic tappets through measurements of sound pressure levels and vibrations and the use of computer graphics to observe actual valve and tappet movement.Two phenomena were clarified: chatter at low engine speeds and a mechanical noise at high engine speeds. Further experiments established that the noise of a mechanical tappet can be greatly reduced and its tonal quality improved by optimizing the cam profile and by increasing the acoustic damping ratio of the tappet.


    Zugriff

    Zugriff prüfen

    Verfügbarkeit in meiner Bibliothek prüfen

    Bestellung bei Subito €


    Exportieren, teilen und zitieren



    Titel :

    Improvement of DOHC Valve Train Noise by Analysis of Valve and Tappet Movement


    Weitere Titelangaben:

    Sae Technical Papers


    Beteiligte:

    Kongress:

    Noise & Vibration Conference & Exposition ; 1991



    Erscheinungsdatum :

    01.05.1991




    Medientyp :

    Aufsatz (Konferenz)


    Format :

    Print


    Sprache :

    Englisch




    Improvement of DOHC valve train noise by analysis of valve and tappet movement

    Kamiyama,E. / Yasuhara,S. / Toyota Motor,JP | Kraftfahrwesen | 1991


    Mechanical, self-adjusting valve tappet

    Engineering Index Backfile | 1950



    Studies on Friction Characteristics of Cam and Roller Tappet for Engine Valve Train

    Soejima, M. / Wakuri, Y. / Ejima, Y. et al. | British Library Online Contents | 1998


    Kia sporgate DOHC

    Online Contents | 1996