To provide a hydraulic drive device of an industrial vehicle which can prevent an operator from feeling that a steering wheel is stuck for a moment when conducting K-turn operation of the steering wheel.SOLUTION: A hydraulic drive device 1 includes: a capacity control valve 4 which controls a variable capacity pump 3; a PS valve 6 disposed between the variable capacity pump 3 and a PS cylinder 5; a lift valve 29 disposed between the variable capacity pump 3 and a lift cylinder 7; hydraulic oil passages 10, 11 connecting the variable capacity pump 3 to the PS valve 6; hydraulic oil passages 10, 31 connecting the variable capacity pump 3 to the lift valve 29; and pilot lines 33, 18 connecting the lift valve 29 to the capacity control valve 4. A spool 35 of the lift valve 29 is provided with a groove part 37 forming a communication passage 36 which allows communication between the hydraulic oil passage 31 and the pilot line 33 at a neutral position 29a of the lift valve 29 when the PS valve 6 is at the neutral position.SELECTED DRAWING: Figure 2

    【課題】運転者がステアリングホイールの切り返し操作を行う際に感じる引っ掛かりを防止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、可変容量ポンプ3を制御する容量制御弁4と、可変容量ポンプ3とPSシリンダ5との間に配設されたPSバルブ6と、可変容量ポンプ3とリフトシリンダ7との間に配設されたリフトバルブ29と、可変容量ポンプ3とPSバルブ6とを接続する作動油流路10,11と、可変容量ポンプ3とリフトバルブ29とを接続する作動油流路10,31と、リフトバルブ29と容量制御弁4とを接続するパイロットライン33,18とを備え、リフトバルブ29のスプール35には、PSバルブ6が中立位置にあるときに、リフトバルブ29の中立位置29aにおいて作動油流路31とパイロットライン33とを連通させる連通路36を構成する溝部37が設けられている。【選択図】図2


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    Titel :

    HYDRAULIC DRIVE DEVICE OF INDUSTRIAL VEHICLE


    Weitere Titelangaben:

    産業車両の油圧駆動装置


    Beteiligte:
    UNO MINESHI (Autor:in) / YOKOMACHI NAOYA (Autor:in) / UEDA SUKENORI (Autor:in) / MATSUO TSUTOMU (Autor:in)

    Erscheinungsdatum :

    2019-05-30


    Medientyp :

    Patent


    Format :

    Elektronische Ressource


    Sprache :

    Japanisch


    Klassifikation :

    IPC:    B62D MOTOR VEHICLES , Motorfahrzeuge / 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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