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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    Title :

    High capacity freewheels for torque converter applications


    Additional title:

    Hochkapazitive Freiläufe für Anwendungen in Drehmomentwandlern


    Contributors:
    Fitz, F. (author)

    Published in:

    Publication date :

    1993


    Size :

    5 Seiten, 8 Bilder



    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English




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