The requirements for emission control, lower fuel consumption and higher engine output have changed the engine valve train system to 4-valve/cylinder and higher cam lift designs, and these changes make the cam/tappet lubrication conditions more severe than before.Under such a working condition, there is a high possibility that cam/tappet surface damages such as scuffing, pitting and wear may occur. Among the damages, the wear of cam/tappet is the most difficult to predict since the wear mechanism still remains unclear.To understand the lubrication condition and therefore, the wear mechanism at the cam/tappet contact, friction was measured with a newly developed apparatus. Measurement results showed that the lubrication condition between cam and tappet is predominantly in the mixed and boundary lubrication conditions. Cam wear test was also carried out and results show that oil deterioration and high oil supply temperature are the two factors that strongly connected to cam abnormal wear. Good correlation was found between the observed wear process in the present test and the predicted wear process as shown in our previous publications[1].


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    Titel :

    A Study on Cam Wear Mechanism with a Newly Developed Friction Measurement Apparatus


    Weitere Titelangaben:

    Sae Technical Papers


    Beteiligte:
    Ito, Akemi (Autor:in) / Negishi, Hideo (Autor:in) / Yang, Lisheng (Autor:in)

    Kongress:

    International Fall Fuels and Lubricants Meeting and Exposition ; 1998



    Erscheinungsdatum :

    1998-10-19




    Medientyp :

    Aufsatz (Konferenz)


    Format :

    Print


    Sprache :

    Englisch




    A study of cam wear mechanism with a newly developed friction measurement apparatus

    Ito,A. / Negishi,H. / Yang,L. et al. | Kraftfahrwesen | 1998


    A newly developed variable valving mechanism with low-mechanical friction

    Shibano,K. / Kamimaru,S. / Yamada,T. et al. | Kraftfahrwesen | 1992


    A Newly Developed Variable Valving Mechanism with Low-Mechanical Friction

    Shibano, Kenji / Watanabe, Kenzo / Kamimaru, Shinji et al. | SAE Technical Papers | 1992


    Friction Measurement of Al-17%Si Monolithic Cylinder with using Newly Developed Floating Liner Device

    Ito, Akemi / Iwasaki, Hideyuki / Kurita, Hirotaka et al. | SAE Technical Papers | 2014


    ADHESIVE WEAR MECHANISM AT FRICTION

    V. V. Artemchuk / M. A. Hrichanyi / O. V. Lemeshev | DOAJ | 2009

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