To provide a hydraulic drive device for an industrial vehicle capable of changing an upper limit pressure of a hydraulic oil to be discharged from a hydraulic pump in accordance with a hydraulic cylinder to be operated.SOLUTION: A hydraulic drive device 1 comprises: a capacity control valve 5 which controls a variable capacity type hydraulic pump 4; a lift valve 27 and a tilt valve 31 which are disposed between the hydraulic pump 4 and a lift cylinder 8/a tilt cylinder 9; a relief valve 40 which is opened when a pilot pressure generated in a pilot line 30 connecting the lift valve 27 and the tilt valve 31 with the capacity control valve 5 becomes equal to or higher than a relief pressure; and a controller 53 which controls an electromagnetic proportional valve 41 in such a manner that the relief pressure of the relief valve 40 becomes different between a time in which the lift lever 28 is operated and a time in which the tilt lever 32 is operated, on the basis of operational states of the lift lever 28 and the tilt lever 32 detected by a lift operation detection sensor 51 and a tilt operation detection sensor 52.SELECTED DRAWING: Figure 1

    【課題】動作する油圧シリンダに応じて油圧ポンプから吐出される作動油の上限圧力を変更することができる産業車両の油圧駆動装置を提供する。【解決手段】油圧駆動装置1は、可変容量型の油圧ポンプ4を制御する容量制御弁5と、油圧ポンプ4とリフトシリンダ8及びティルトシリンダ9との間に配置されたリフトバルブ27及びティルトバルブ31と、リフトバルブ27及びティルトバルブ31と容量制御弁5とを接続するパイロットライン30に発生するパイロット圧がリリーフ圧以上になると開くリリーフ弁40と、リフト操作検知センサ51及びティルト操作検知センサ52により検出されたリフトレバー28及びティルトレバー32の操作状態に基づいて、リフトレバー28が操作されたときとティルトレバー32が操作されたときとで、リリーフ弁40のリリーフ圧が異なるように、電磁比例弁41を制御するコントローラ53とを備える。【選択図】図1


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    Titel :

    HYDRAULIC DRIVE DEVICE FOR INDUSTRIAL VEHICLE


    Weitere Titelangaben:

    産業車両の油圧駆動装置


    Beteiligte:
    KONDO EISUKE (Autor:in)

    Erscheinungsdatum :

    09.07.2020


    Medientyp :

    Patent


    Format :

    Elektronische Ressource


    Sprache :

    Japanisch


    Klassifikation :

    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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