The future trends in drive trains for mobile machinery incorporate hydrostatics in different topologies. For simple hydrostatic drives with two driving ranges, but without power shift the next step is Rexroth Shift-on-Fly. It allows up- and downshifting not only in standstill but also during driving. Both comfort and productivity can be remarkably increased while the additional costs are negligible. For all types of vehicles with demanding specifications power split transmissions are the right solution. The design of power split transmissions allows many different concepts, thus the application needs to be investigated thoroughly to find the optimum solution. While in tractors the forward efficiency is far more important than the efficiency in driving backward, the situation is completely different in wheel loaders. Especially for on-road applications with start-stop cycles the combination of a power split drive with a Rexroth regenerative brake system is advantageous. While it is difficult to save braking energy in off-road applications, the good friction conditions on road allow higher recuperation rates. Also due to their high weight, as a possible application reach stackers could benefit from this approach. In this paper an overview of actual and future hydrostatic drive train technology is presented. By means of three example vehicles, the advantages of Rexroth Shift-on-Fly, power split transmissions and regenerative brake systems are discussed. The analysis of application in combination with drive cycle simulation helps to find the optimum drive train solution. In this contribution several drive train setups are presented from hydrostatic drives with mechanical transmissions in series to power split drives, also with energy recuperation. As examples optimum solutions in regard to functionality and cost are presented for telehandlers, wheel loaders and reach stackers.


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    Title :

    Systematic of hydrostatic drive trains for mobile applications


    Additional title:

    Systematik hydrostatischer Fahrantriebe für mobile Anwendungen


    Contributors:
    Kliffken, M.G. (author) / Langenbeck, B. (author) / Mutschler, S. (author) / Weber, M. (author)


    Publication date :

    2008


    Size :

    12 Seiten, 9 Bilder, 11 Quellen


    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English





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