Rheological properties of automatic transmission fluids (ATFs) are typically characterized by their kinematic (ASTM D 445) and Brookfield (ASTM D 2983) viscosities. However, ATFs contain polymeric viscosity modifiers, which often result in non-Newtonian fluid behavior as the polymers align and stretch under the shear stresses experienced in automatic transmissions. Therefore, the standard rheological tests, which are normally run under low shear stresses, may not adequately characterize an ATF's flow properties under the operating conditions of the automatic transmission. This study was designed to characterize the rheological properties of ATFs containing different amounts of viscosity modifiers, different base oil types and different levels of permanent shear stability under the shear and temperature conditions which exist in automatic transmissions. The results indicate that fluids with the same kinematic and Brookfield viscosities can have viscosities under typical transmission operating conditions that differ by as much as 40%.


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    Titel :

    Low and High Temperature Non-Newtonian Behavior of Automatic Transmission Fluids


    Weitere Titelangaben:

    Sae Technical Papers


    Beteiligte:
    Devlin, Mark T. (Autor:in) / Glasgow, Michael B. (Autor:in) / Sarkar, Reuben (Autor:in) / Li, Shoutian (Autor:in) / Jao, Tze-Chi (Autor:in)

    Kongress:

    Spring Fuels & Lubricants Meeting & Exhibition ; 2002



    Erscheinungsdatum :

    06.05.2002




    Medientyp :

    Aufsatz (Konferenz)


    Format :

    Print


    Sprache :

    Englisch




    Low and high temperature non-Newtonian behavior of automatic transmission fluids

    Sarkar,R. / Devlin,M.T. / Li,S. et al. | Kraftfahrwesen | 2002


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    Kite, Jr., W.H. / Koenig, E.F. | Engineering Index Backfile | 1959


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    Bogue, Donald Chapman / White, James Lindsay | TIBKAT | 1970


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    Landel, R. F. / Peng, S. T. J. / Lin, R. T. S. | NTRS | 1977