The familiar continuously variable steel belt transmissions being introduced for automotive use are 'straight' CVT's, where total speed ratio span is limited to capability of the variable speed belt and pulley system. Meeting start-up performance and gradeability requirements penalizes the final drive or axle ratio resulting in the transmission reaching the maximum overdrive ratio prematurely. The Ford Research front wheel drive Dual Mode CVT employs a torque converter for start-up in addition to a full range of CVT operation as a means of improving both smoothness and fuel economy. The torque converter and a separate chain drive power path from the engine to the variable speed unit are arranged in parallel. This combination provides an approximate 30 % effective increase in ratio coverage to 7:1. Vehicle fuel economy is thus improved an estimated 5-9 % during highway driving because the final drive ratio can be reduced 30 %. Vehicle start-up through the torque converter is inherently smooth. A 4x4 system is also derived from the base FWD, having a bevel gear power take-off near the vehicle center.


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    Titel :

    The Ford research dual mode continuously variable transmission


    Weitere Titelangaben:

    Das kontinuierlich variable Zweizweckforschungsgetriebe von Ford


    Beteiligte:
    Stockton, T.R. (Autor:in)


    Erscheinungsdatum :

    1984


    Format / Umfang :

    7 Seiten, 12 Bilder


    Medientyp :

    Aufsatz (Konferenz)


    Format :

    Print


    Sprache :

    Englisch




    The Ford research dual mode continuously variable transmission

    STOCKTON, T R | SAE Technical Papers | 1984


    The Ford research dual mode continuously variable transmission

    Stockton,T.R. / Ford Motor,US | Kraftfahrwesen | 1984


    Dual clutch continuously variable transmission

    HOLMES ALAN G | Europäisches Patentamt | 2017

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