PROBLEM TO BE SOLVED: To provide a hydraulic driving device for a cargo handling vehicle with an excellent energy recovery efficiency capable of stabilizing a flow rate control property of a working fluid.SOLUTION: A hydraulic driving device 16 includes a resistance element 80 which is disposed closer to a lift cylinder 4 than an operation valve 48 in a lowering oil passage 47 and increases fluid resistance. A pilot flow passage 51 of a bypass flow rate control valve 50 is electrically connected between the lift cylinder 4 and the resistance element 80 in the lowering oil passage 47. Accordingly, a pressure equivalent to the amount of a pressure loss generated in the resistance element 80 can be applied to a pilot pressure of the bypass flow rate control valve 50. Therefore, the pilot pressure can be increased by the amount added with the pressure loss of the resistance element 80. The influence of disturbance destabilizing the operation of the bypass flow rate control valve 50 can be reduced by increasing the pilot pressure.SELECTED DRAWING: Figure 2

    【課題】エネルギー回収効率が良く、作動油の流量制御特性を安定させることができる荷役車両の油圧駆動装置を提供する。【解決手段】油圧駆動装置16は、下降油路47のうち、操作弁48よりもリフトシリンダ4側に配設され、流体抵抗を増加させる抵抗要素80を備えている。また、バイパス流量制御弁50のパイロット流路51は、下降油路47のうち、リフトシリンダ4と抵抗要素80との間に導通される。このような構成により、バイパス流量制御弁50のパイロット圧力に対して、抵抗要素80で発生する圧力損失分を加えることができる。従って、抵抗要素80の圧力損失を加えた分だけパイロット圧力を大きくすることができる。このようにパイロット圧力を大きくすることにより、バイパス流量制御弁50の動作を不安定にする外乱の影響を小さくすることができる。【選択図】図2


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    Title :

    HYDRAULIC DRIVING DEVICE FOR CARGO HANDLING VEHICLE


    Additional title:

    荷役車両の油圧駆動装置


    Contributors:

    Publication date :

    2018-05-24


    Type of media :

    Patent


    Type of material :

    Electronic Resource


    Language :

    Japanese


    Classification :

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



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    UEDA SUKENORI | European Patent Office | 2018

    Free access