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.


    Access

    Access via TIB

    Check availability in my library


    Export, share and cite



    Title :

    The Ford research dual mode continuously variable transmission


    Additional title:

    Das kontinuierlich variable Zweizweckforschungsgetriebe von Ford


    Contributors:


    Publication date :

    1984


    Size :

    7 Seiten, 12 Bilder


    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English




    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 | Automotive engineering | 1984


    Dual clutch continuously variable transmission

    HOLMES ALAN G | European Patent Office | 2017

    Free access