Wet start clutches put new, more severe, requirements on the lubricants used in these transmissions. The fluids must provide the correct friction versus velocity characteristics to prevent clutch shudder and maintain those characteristics for long periods of time to allow extended drain intervals for the fluids. While many methods exist for characterizing the frictional behaviour of clutch materials and fluids under conditions of high energy engagements, no standard test exists for measuring the friction durability of transmission fluids in a mixed operational mode of high energy engagements and sliding for long periods of time at low speeds. In response to the need for a test to assess friction durability requirements of torque converters with regulated clutches (GWK) the authors have developed a test method using a modified SAE2 machine. A test cycle was developed in which the clutch is slipped under steady state conditions for 50 minutes. A program was begun to develop a new friction system that would allow for significantly longer friction control than the conventional friction systems used in ATF-1 and ATF-2. This program yielded a family of friction modifying chemicals that can be treated at concentrations over ten times that of conventional friction modifiers.


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    Titel :

    Formulating fluids with improved friction durability for wet start clutches


    Weitere Titelangaben:

    Schmierstoffe mit erhöhter Reibungsfestigkeit für Anfahr-Nasskupplungen


    Beteiligte:
    Watts, Raymond (Autor:in) / Castle, Rebecca (Autor:in) / Gorda, Keith (Autor:in) / Nibert, Roger (Autor:in)

    Erschienen in:

    Erscheinungsdatum :

    2004


    Format / Umfang :

    12 Seiten, 10 Bilder, 3 Tabellen, 3 Quellen




    Medientyp :

    Aufsatz (Konferenz)


    Format :

    Print


    Sprache :

    Englisch




    Formulating Fluids with Improved Friction Durability for Wet Start Clutches

    Watts, R. F. / Castle, R. C. / Gorda, K. R. et al. | British Library Conference Proceedings | 2004


    Friction clutches

    Gass, William G. | Engineering Index Backfile | 1916


    Simplified computation of friction clutches

    Arnold, R. | Engineering Index Backfile | 1946


    Systematic development of friction clutches

    Abdullah, Oday Ibraheem / Technische Universität Hamburg-Harburg / Technische Universität Hamburg-Harburg, Institut für Laser- und Anlagensystemtechnik et al. | TIBKAT | 2015