PROBLEM TO BE SOLVED: To provide a hydraulic drive device capable of improving recovery efficiency of potential energy of a lifting article.SOLUTION: A hydraulic drive device 1 comprises: an operation valve 37 which is disposed in a hydraulic oil passage 35 connecting a suction port 10a of a hydraulic pump 10 with a lift cylinder 2 and controls a flow of a hydraulic oil in accordance with a manipulation variable of a lift operation lever 6 for moving a fork 5 downwards; a bypass flow rate control valve 38 which is disposed in a hydraulic oil passage 36 connecting the hydraulic oil passage 35 with a tank 13 and controls a flow rate of a hydraulic oil that is returned to the tank 13; an accumulator 39 which is connected to the hydraulic oil passage 35 and accumulates a pressure of the hydraulic oil from the lift cylinder 2; a flow rate control valve 40 for pressure accumulation which is disposed in the hydraulic oil passage 35 and controls a flow rate of a hydraulic oil that is supplied to the accumulator 39; and an orifice 41 that is disposed between a branch point A in the hydraulic oil passage 35 from the hydraulic oil passage 36 and the flow rate control valve 40 for pressure accumulation.SELECTED DRAWING: Figure 1

    【課題】昇降物の位置エネルギーの回収効率を向上させることができる油圧駆動装置を提供する。【解決手段】油圧駆動装置1は、油圧ポンプ10の吸込口10aとリフトシリンダ2とを接続する作動油流路35に配設され、フォーク5を下降させるためのリフト操作レバー6の操作量に応じて作動油の流れを制御する操作弁37と、作動油流路35とタンク13とを接続する作動油流路36に配設され、タンク13に戻る作動油の流量を制御するバイパス用流量制御弁38と、作動油流路35に接続され、リフトシリンダ2からの作動油を蓄圧するアキュムレータ39と、作動油流路35に配設され、アキュムレータ39に供給される作動油の流量を制御する蓄圧用流量制御弁40と、作動油流路35における作動油流路36との分岐点Aと蓄圧用流量制御弁40との間に配設されたオリフィス41とを備える。【選択図】図1


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    Title :

    HYDRAULIC DRIVE DEVICE


    Additional title:

    油圧駆動装置


    Contributors:

    Publication date :

    2018-08-23


    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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