A hydraulic drive device includes a resistance element disposed closer to the lift cylinder than the operation valve in the lowering oil path and increasing the fluid resistance. In addition, a pilot flow path of a bypass flow rate control valve is connected between the lift cylinder and the resistance element in the lowering oil path. With such a configuration, it is possible to add the pressure loss generated in the resistance element to the pilot pressure of the bypass flow rate control valve. Therefore, the pilot pressure can be increased by the addition of the pressure loss of the resistance element. By increasing the pilot pressure in this manner, it is possible to reduce the influence of the disturbance which makes the operation of the bypass flow rate control valve unstable.


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    Title :

    HYDRAULIC DRIVE DEVICE FOR CARGO VEHICLE


    Additional title:

    HYDRAULISCHE ANTRIEBSVORRICHTUNG FÜR EIN FRACHTFAHRZEUG
    DISPOSITIF D'ENTRAÎNEMENT HYDRAULIQUE POUR VÉHICULE DE CHARGEMENT


    Contributors:
    UEDA YUKI (author)

    Publication date :

    2022-04-06


    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 / F15B SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL , Druckmittelbetriebene Systeme allgemein



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