Volume 3, Issue 1

    Stribeck-Type Curves of Alternative Engine Oils: Part I: Gray Cast Iron Liners

    (Received 10 February 2012; accepted 29 January 2014)

    Published Online: 2014

    CODEN: MPCOAD

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    Abstract

    Wear tests are often used in engine development in order to characterize the functional profile of surfaces interacting with lubricants. This paper proposes a new test procedure to determine Stribeck-type curves for the tribosystem piston ring/cylinder liner involving test pieces prepared from engine components. The variation of the friction coefficient with sliding speed depends on the structure and constitution of the base oil, the viscosity index, the surface topography of the liner and ring, and the friction modifiers used. Novel organic friction modifiers of low molecular mass not only reduce the friction coefficients under mixed / boundary lubrication, but also in the fluid film regime. In addition, the influence of surface roughness on the wettability of surfaces can be significant for both static and dynamic wetting. For this reason, the interaction of the lubricant with the surfaces was also investigated to enable a correlation between the surface properties of the liquid and solid phases and the tribological behavior.


    Author Information:

    Woydt, Mathias
    BAM Federal Institute for Materials Research and Testing, Berlin,

    Kelling, Norbert
    BAM Federal Institute for Materials Research and Testing, Berlin,

    Hannemann, Falk
    BMW Group, Munich,

    Berberich, Niklas
    BMW Group, Munich,

    Ziegele, Holger
    BMW Group, Munich,


    Stock #: MPC20120002

    ISSN: 2165-3992

    DOI: 10.1520/MPC20120002

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    Author
    Title Stribeck-Type Curves of Alternative Engine Oils: Part I: Gray Cast Iron Liners
    Symposium , 0000-00-00
    Committee D02