Five automotive oils, with different viscosity grades, were tested under different loads and speeds in a reciprocating test using piston rings and cylinder liners. Starved and fully-flooded conditions were also considered in order to analyze the influence of lubricant supplier in the lubrication regimes, especially in boundary-mixed transition. The expected Stribeck curve behavior was observed, and more interesting visualization appeared when the viscosity value was extracted from the Stribeck abscissa axis. The higher viscosity oils showed lower friction coefficient at low speed/load ratios. Such behavior is usually neglected and may be significant to understand the triblogical behaviour of engineering components. Computer simulation showed similar results, including the “cross-over” speed/load when the lower viscosity oils start to show lower friction.


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    Title :

    Effect of Lubricant Viscosity and Friction Modifier on Reciprocating Tests


    Additional title:

    Sae Technical Papers



    Conference:

    22nd SAE Brasil International Congress and Display ; 2013



    Publication date :

    2013-10-07




    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English








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