Influence of surface topography on the tribo-characteristics of an eccentric-tappet pair

J. Wang, C.H. Venner, A.A. Lubrecht

    Research output: Chapter in Book/Report/Conference proceedingConference contributionAcademicpeer-review

    Abstract

    The cam-tappet pair is one of the most important components in an engine and determines the overall performance of the motor. Compared with modern car engines using rolling-sliding tappets for the transmission of the rapid up-down lifting motion of the cam to open and close the engine's inlet and exhaust valves, the flat-tappets are often subject to fatigue failure. Upon stripping down a damaged motor, the tappets are invariably found to be heavily pitted. This study performs a theoretical simulation of the surface topography influence on the tribo-characteristics of an eccentric-tappet pair. The asperities on the flat-tappet surface generate fluctuations of the pressure, film thickness and temperature distributions. The pressure fluctuations result in alternative stresses in the metal. The periodical variations of pressure, minimum film thickness and thermal rise are investigated by changing the eccentricity and roughness wavelength. The results suggest an explanation for the rapid occurrence of cracks or even complete fracture in the cam and flat-tappet pair. 

    Original languageEnglish
    Title of host publicationASME/STLE 2012 International Joint Tribology Conference, IJTC 2012
    Place of PublicationNew York, NY
    PublisherAmerican Society of Mechanical Engineers (ASME)
    Pages263-264
    Number of pages2
    ISBN (Print)978-0-7918-4508-0
    DOIs
    Publication statusPublished - 2012
    EventASME/STLE 2012 International Joint Tribology Conference, IJTC 2012 - Denver, United States
    Duration: 7 Oct 201210 Oct 2012

    Conference

    ConferenceASME/STLE 2012 International Joint Tribology Conference, IJTC 2012
    Abbreviated titleIJTC
    CountryUnited States
    CityDenver
    Period7/10/1210/10/12

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  • Cite this

    Wang, J., Venner, C. H., & Lubrecht, A. A. (2012). Influence of surface topography on the tribo-characteristics of an eccentric-tappet pair. In ASME/STLE 2012 International Joint Tribology Conference, IJTC 2012 (pp. 263-264). New York, NY: American Society of Mechanical Engineers (ASME). https://doi.org/10.1115/IJTC2012-61196