PROBLEM TO BE SOLVED: To provide a hydraulic driving device for a cargo handling vehicle capable of efficiently recovering potential energy of a cargo while lowering a lifting hydraulic cylinder at a desired lowering speed.SOLUTION: When a hydraulic oil can be accumulated in an accumulator 80, the hydraulic oil discharged from a lift cylinder 4 for lifting can be accumulated in the accumulator 80 through an accumulation flow control valve 81. Accordingly, a potential energy of a cargo can be accumulated in the accumulator 80 and used at another timing. Meanwhile, when the hydraulic oil cannot be accumulated in the accumulator 80, the hydraulic oil discharged from the lift cylinder 4 for lifting can be supplied to a tank 19 through a bypass flow control valve 50. Therefore, variation in flow rate of the hydraulic oil discharged from the lift cylinder 4 for lifting can be suppressed and the lift cylinder 4 can be lowered at a desired lowering speed.SELECTED DRAWING: Figure 4

    【課題】積荷の位置エネルギーを効率よく回収可能であると共に、昇降用の油圧シリンダを所望の下降速度で下降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】アキュムレータ80への蓄圧が可能な場合には、昇降用のリフトシリンダ4から吐出される作動油は、蓄圧流量制御弁81を介してアキュムレータ80へ蓄圧可能である。このように、積荷の位置エネルギーをアキュムレータ80に蓄圧し、他のタイミングで利用することが可能となる。一方、アキュムレータ80への蓄圧が出来ない場合には、昇降用のリフトシリンダ4から吐出される作動油をバイパス流量制御弁50を介してタンク19へ供給できる。従って、昇降用のリフトシリンダ4から吐出される作動油の流量の変動を抑制し、当該リフトシリンダ4を所望の下降速度で下降させることができる。【選択図】図4


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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:    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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