Providing high efficiency hydrostatic units is a key demand for pump/motor manufacturers today, and clearly the need for reducing losses will even grow in the future. Next to providing high efficient rotating groups, a further option to improve hydrostatic unit efficiency is the elimination of churning losses, preferably in hydrostatic bent axis motors due to the high speeds. This technology is known from wide angle (45°) bent axis units in powersplit tractor applications, which achieve the highest series efficiency today. To analyze the reduction of energy consumption by avoiding churning tosses for standard hydrostatic drivelines a bent axis motor has been tested and compared in full and dry case operation according to efficiency and losses. The generated measurement data was then used as base for different churning loss models in a next step, the selected model was implemented in wheel loader and crawler drivetrain simulation models. Dynamic simulations predicted a noticeable fuel saving potential depending on the operating conditions when dry case instead of full case operation was used when the motor is running at higher speeds. The efficiency component measurements and generated models were successfully verified with additional tests on a complete driveline test stand. These additional tests included investigations on lank designs and analyzed the basic abilities to avoid foaming.


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    Titel :

    Efficiency potential of dry case operation for bent-axis motors


    Beteiligte:
    Rahmfeld, Robert (Autor:in) / Marsch, Sünje (Autor:in) / Göllner, Wilhelm (Autor:in) / Lang, Thorsten (Autor:in) / Dopichay, Thomas (Autor:in) / Untch, Johannes (Autor:in)


    Erscheinungsdatum :

    2012


    Format / Umfang :

    14 Seiten, 9 Bilder, 1 Tabelle, 7 Quellen


    Medientyp :

    Aufsatz (Konferenz)


    Format :

    Print


    Sprache :

    Englisch






    Series 51:a family of bent axis motors to meet todays market requirements

    Thompson,L.J. / Bretz,L. / Sauer-Sundstrand,US | Kraftfahrwesen | 1991


    Series 51: A Family of Bent Axis Motors to Meet Today's Market Requirements

    Thompson, Lester J. / Bretz, Lyle | SAE Technical Papers | 1991