The Mechanical Diode (MD) one-way clutch was the result of an engineering project to develop a C.A.R.T. (Indy Car) transmission based on the Epilogics Infinitely Variable Transmission technology. Because the available devices (of suitable torque capacity) were simply too heavy, an alternative to conventional one-way clutches had to be found in oder to meet the weight requirement for this application. The solution was found in an innovative, planar, vernier ratchet design which incorporates low-mass, low-inertia 'struts' to provide a fast-reacting, positive-engagement, lock-up mode as well as a non-contact freewheel mode to maximize overrunning performance. This paper presents an evaluation of the MD used as a one-way clutch in high performance, drag racing torque converter reactors. In this application, the Mechanical Diode replaces conventional one-way clutches which are based on sprag and roller-ramp design principles. Design rules, laboratory test results and in-car performance data are examined. Comparisons between the three different approaches are used extensively in the discussion. Dragstrip experience with several hundred MDs installed in a wide variety of race cars spanning a broad range of vehicle weight and engine power is used to corroborate the results of laboratory tests. The dragstrip proves to be an extremely harsh environment for automotive transmission one-way clutches in general and torque converter one-way clutches in particular due to the severe impact loads to which the one-way clutches are subjected. The results and conclusions presented in this study are clearly illustrated with case studies of actual race cars using MD-equipped, high performance torque converters.


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    Titel :

    High capacity freewheels for torque converter applications


    Weitere Titelangaben:

    Hochkapazitive Freiläufe für Anwendungen in Drehmomentwandlern


    Beteiligte:
    Fitz, F. (Autor:in)

    Erschienen in:

    Erscheinungsdatum :

    1993


    Format / Umfang :

    5 Seiten, 8 Bilder



    Medientyp :

    Aufsatz (Konferenz)


    Format :

    Print


    Sprache :

    Englisch




    High Capacity Freewheels for Torque Converter Applications

    Fitz, Frank | SAE Technical Papers | 1993


    20044272 Development of a Compact Torque Converter with High Torque Capacity

    Okada, K. / Makino, T. / Ishikawa, M. et al. | British Library Online Contents | 2004



    Development of a high torque capacity belt-drive CVT with a torque converter

    Kurosawa,M. / Kobayashi,M. / Topminaga,M. et al. | Kraftfahrwesen | 1999


    Development of a high torque capacity belt-drive CVT with a torque converter

    Kurosawa, M. / Kobayashi, M. / Tominaga, M. | Tema Archiv | 1999