To provide a hydraulic drive device capable of suppressing hunting of a counter balance valve and quick starting of a hydraulic actuator.SOLUTION: A hydraulic drive device includes: a hydraulic actuator 12; a counter balance valve 20 that operates to open and close according to a meter-in pressure of the hydraulic actuator 12; a valve-opening pilot line 22 for introducing the meter-in pressure as a pilot pressure to the counter balance valve 20; a variable throttle valve 24 provided in the middle of the valve-opening pilot line; and throttle control parts 26A, 26B. When an actuator differential pressure, which is the difference between the meter-in pressure of the hydraulic actuator 12 and a meter-out pressure, is equal to or higher than a preset set differential pressure, the throttle control parts 26A, 26B input an opening command signal to the variable throttle valve 24 to make the opening area of the variable throttle valve 24 larger as compared with that when the actuator differential pressure is less than the set differential pressure.SELECTED DRAWING: Figure 1

    【課題】カウンタバランス弁のハンチングの抑制と油圧アクチュエータの迅速な始動とが可能な油圧駆動装置を提供する。【解決手段】油圧駆動装置は、油圧アクチュエータ12と、油圧アクチュエータ12のメータイン圧に応じて開閉動作するカウンタバランス弁20と、メータイン圧をカウンタバランス弁20にパイロット圧として導く開弁パイロットライン22と、開弁パイロットラインの途中に設けられる可変絞り弁24と、絞り制御部26A,26Bと、を備える。絞り制御部26A,26Bは、油圧アクチュエータ12のメータイン圧とメータアウト圧との差であるアクチュエータ差圧が予め設定された設定差圧以上の場合にはアクチュエータ差圧が設定差圧未満の場合に比べて可変絞り弁24の開口面積を大きくするように可変絞り弁24に開口指令信号を入力する。【選択図】 図1


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    Title :

    HYDRAULIC DRIVE DEVICE WITH COUNTER BALANCE VALVE


    Additional title:

    カウンタバランス弁を備えた油圧駆動装置


    Contributors:
    INUKAI RYOTA (author) / HORI NAOTO (author)

    Publication date :

    2019-12-26


    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 / B66C Krane , CRANES / B66D Haspeln , CAPSTANS



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