Never before there have been so many promising developments on the field of vehicle gearboxes. Beside the further development of manual transmissions and automatic transmissions the engineers are concerned with the redesign of automated gears and double clutch transmissions as well as with the design of continuously variable transmissions of various technologies with and without power splitting. Some Japanese car makers like Toyota have already investigated special power splitting hybrid transmissions. And all the other transmission technologies may be a basis for more or less complex hybrid systems. Therefore it is an interesting question why we should investigate transmissions with an additional electrical auxiliary drive on top of that. In this paper the additional benefits which these gearboxes offer to future drive lines are discussed. For an improved design of conventional gearbox systems the main target concerns a sufficiently large ratio range, that can be used conveniently and most possible without traction interruption when shifting the gears or even better be used continuously variable. But the relative high reductions of fuel consumption, which are still necessary to comply with the future environmental control laws, can only be achieved through a better energy management in the vehicle. For that an electrical accessory drive can be helpful, that supports also the increasing electrical subsystems in the vehicle power circuit. By using of winding structures very compact gearboxes can be constructed with few gearwheels for many speeds. It is even possible to define such structures for double clutch transmissions, in which the power runs through two friction clutches from the combustion engine into the gearbox by turns from gear to gear. These structures have two part gears interlaced into each other but only with a maximum of two shafts laying into each other. Only with 10 gearwheels in 5 wheel plane 8 forward speeds can be shifted. At least one reverse gear may be generated by an additional wheel plane or may result from the use of a third shaft. Through the step-by-step integration of electrical auxiliary drives into conventional gear systems a lot of different convincing hybrid concepts can arise. All these transmissions combine the well known basic functions of the gearbox with considerable extra options. In the same extent as the development of vehicle-apt electric components continues, the electrical auxiliary drive can be strengthened. With such a strategy of the development of modern drive lines the future requirements relating to fuel consumption, emissions, driving dynamics and comfort can be well fulfilled.


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    Titel :

    Electric-mechanical vehicle transmissions


    Weitere Titelangaben:

    Elektromechanische Kraftübertragung für Fahrzeuge


    Beteiligte:
    Tenberge, P. (Autor:in) / Hofmann, W. (Autor:in)


    Erscheinungsdatum :

    2002


    Format / Umfang :

    27 Seiten, 14 Bilder, 2 Tabellen, 38 Quellen



    Medientyp :

    Aufsatz (Konferenz)


    Format :

    Print


    Sprache :

    Englisch




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