Most automotive multigrade oils contain high molecular weight polymeric viscosity index improvers (VII's) and are, to a greater or lesser extent, viscoelastic fluids. For many years the effect of multigrade oil viscoelasticity on journal bearing lubricant load bearing capacity (LBC), (and implicitly minimum oil film thickness) has been a vexed question. The work described in this paper provides experimental evidence that a significant enhancement of journal bearing LBC over that generated by isoviscous Newtonian (single grade) oils can be achieved by the use of multigrade oils under simulated realistic in-senice engine conditions. This effect only occurs under operation at high eccentricity ratios. At lower eccentricity ratios no enhancement in LBC could be found. Examination of the effect of lubricant piezoviscosity on LBC failed to account for the load bearing enhancement phenomenon. Additionally, it is demonstrated that the LBC of transiently loaded journal bearings is a function of both lubricant viscosity and elasticity and that these parameters can be interchanged, for example, to produce a low viscosity (low friction) multigrade oil without compromising journal bearing LBC (and hence durability).


    Zugriff

    Zugriff prüfen

    Verfügbarkeit in meiner Bibliothek prüfen

    Bestellung bei Subito €


    Exportieren, teilen und zitieren



    Titel :

    Enhancement of Journal Load Bearing Capacity by Polymer Containing Oils


    Weitere Titelangaben:

    Sae Technical Papers


    Beteiligte:

    Kongress:

    International Spring Fuels & Lubricants Meeting & Exposition ; 1997



    Erscheinungsdatum :

    1997-05-01




    Medientyp :

    Aufsatz (Konferenz)


    Format :

    Print


    Sprache :

    Englisch




    Enhancement of journal load bearing capacity by polymer containing oils

    Williamson,B.P. / Shell Research and Technology Centre,GB | Kraftfahrwesen | 1997


    The Effect of Fuel-Saving Engine Oils on Journal Bearing Load Capacity–A Radiometric Evaluation

    Schneider, Eric W. / Rosenberg, Richard C. | SAE Technical Papers | 1982


    The Effect of Fuel-Saving Engine Oils on Journal Bearing Load Capacity - A Radiometric Evaluation

    Schneider,E.W. / Rosenberg,R.C. / General Motors Res.Lab.,US | Kraftfahrwesen | 1982


    Journal surface finish effects on bearing load capacity

    Schneider,E.W. / Blossfeld,D.H. / General Motors,US | Kraftfahrwesen | 1999


    Assessment of Lubricant Load Bearing Capacity Using a Journal Bearing Simulator Bench Test

    Bates, T. W. / Evans, P. G. / Taylor, J. C. et al. | British Library Conference Proceedings | 1993