In hydrostatic steering systems, occasionally, the need arises of exerting large forces as, for example, is the case in steering actuators or articulated dumpers or in rudder actuation on ships. Consequently, linear motors with large bore diameters are required not to exceed system operational pressure limits. Such actuators, whose travel is dependent on the specific application, absorb a quite large flow rate (up to 400 l/min) to respond, within an appropriate time frame, to steering commands. The flow rate, generated by a properly sized feed unit, cannot in full be handled by the hydro-steering, as this, beside other aspects, would necessarily imply tooo large an orbital motor. A feasible solution to the problem is grounded only what can be regarded as a control flow. with a flow amplifier capable of multiplying that flow by a nomimally constant factor and of delovering control and power flows to the steering actuators. In this framework the paper considers a commercial flow amplifier, embodying a priority valve, used in applicaitons where the flow rate handled by a standard hydro-steering is inadequate in providing sufficient actuator velocitiers. This is the case in a class of ariculated dumpers where priority is granted to steering and excess flow is deverted to a secondary user (lift dump actuator). The amplifier, detailed in its constitutive components, fuctions and peculiarities, is analysed in depth and its modelling, developed within the AMESim simulation environment, allows to establish its amplification factor, and how this becomes influenced by the control flow rate (yielded by the hydro steering) and by varying loads on steering cylinders.


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    Title :

    Flow amplifiers in hydrostatic steering


    Additional title:

    Volumenverstärker in der hydrostatischen Lenkung


    Contributors:
    Gilardino, L. (author) / Manco, S. (author) / Nervegna, N. (author) / Pavanetto, M.A. (author)


    Publication date :

    2002


    Size :

    15 Seiten, 53 Bilder, 5 Quellen




    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English




    Flow Amplifiers in Hydrostatic Steering

    Gilardino, L. / Pavanetto, M. A. / Nervegna, N. et al. | SAE Technical Papers | 2002


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