Hybrid drivetrain hardware combines an electric motor and a transmission, gear box, or hydraulic unit. With many hybrid electric vehicle (HEV) hardware designs the transmission fluid is in contact with the electric motor. Some OEMs and tier suppliers have concerns about the electrical properties of automatic transmission fluids (ATFs). Lubrizol has conducted a fundamental research project to better understand the electrical conductivity of ATFs. In this paper, we will present conductivity data as a function of temperature for a range of commercially available ATFs. All fluids had conductivities ranging from 0.9 to 8x10-9 S/cm at 100 °C and can be considered insulators with the ability to dissipate static charge. Next we will deconstruct one ATF to show the relative impact of the various classes of lubricant additives. We find that more polar additives have a larger effect on conductivity on a normalized (per weight %) basis. Finally, we will show conductivity data for ATFs taken from field trial vehicles and present data to demonstrate that the increase in conductivity is due to oil oxidation and a reduction in viscosity, not the presence of metallic wear particles or dissolved metals.


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    Titel :

    Electrical Conductivity of New and Used Automatic Transmission Fluids


    Weitere Titelangaben:

    Sae Int. J. Fuels Lubr
    Sae International Journal of Fuels and Lubricants


    Beteiligte:
    McFadden, Chris (Autor:in) / Hughes, Kevin (Autor:in) / Raser, Lydia (Autor:in) / Newcomb, Timothy (Autor:in)

    Kongress:

    SAE 2016 International Powertrains, Fuels & Lubricants Meeting ; 2016



    Erscheinungsdatum :

    2016-10-17


    Format / Umfang :

    8 pages




    Medientyp :

    Aufsatz (Konferenz)


    Format :

    Print


    Sprache :

    Englisch




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    EVALUATING AUTOMATIC TRANSMISSION FLUIDS

    KOENIG, E. F. / KITE, WILLIAM H. | SAE Technical Papers | 1959


    Automatic Transmission and Driveline Fluids*

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    Automatic transmission and driveline fluids

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