A hydraulic drive device (16) for cargo handling vehicle has: a tank (19); a pump (17) for drawing in a hydraulic oil from the tank and supplying the hydraulic oil to hydraulic cylinders; an electric motor (18) for driving the pump; a solenoid-controlled proportional valve (48) disposed between an inlet port of the pump and a bottom chamber of an up-and-down hydraulic cylinder (4) and configured to open with a valve travel depending upon a control input of a descent control of an up-and-down control member; a pressure compensation valve (50) disposed between a branch portion located between the pump and the solenoid-controlled proportional valve and the tank and configured to open with a valve travel depending upon a pressure difference between pressures upstream and downstream of the solenoid-controlled proportional valve; and a valve (53) disposed between the pressure compensation valve and the tank and configured to be switched between an open position and a close position.


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    Title :

    Hydraulic drive device for cargo handling vehicle


    Additional title:

    Hydraulisch angetriebene Vorrichtung für Frachtumschlagfahrzeug
    Dispositif d'entraînement hydraulique pour véhicule de manutention de cargaison


    Contributors:

    Publication date :

    2016-05-04


    Type of media :

    Patent


    Type of material :

    Electronic Resource


    Language :

    English


    Classification :

    IPC:    B66F HOISTING, LIFTING, HAULING, OR PUSHING, NOT OTHERWISE PROVIDED FOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCE DIRECTLY TO THE SURFACE OF A LOAD , Hub-, Verhol- oder Schubvorrichtungen, soweit nicht anderweitig vorgesehen, z.B. Vorrichtungen mit unmittelbarer Krafteinwirkung auf die Last / F04B Verdrängerkraft- und Verdrängerarbeitsmaschinen für Flüssigkeiten , POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS / F15B SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL , Druckmittelbetriebene Systeme allgemein



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