To provide a hydraulic drive system capable of controlling a discharge flow rate of a first pump according to a cargo work operation command when making a working fluid of a first pump that is a steering-type pump merge with a working fluid of a second pump that is a cargo work-type pump.SOLUTION: A hydraulic drive system comprises: a first pump; a second pump; a steering circuit having a steering valve; a cargo work circuit; a priority valve; a first regulator controlling a discharge flow rate of the first pump according to a differential pressure between an input signal pressure and a discharge pressure of the first pump; a control valve outputting a cargo work side load control pressure in which a cargo work side supply pressure that is a liquid pressure of a working fluid supplied to the cargo work circuit is adjusted according to a cargo work operation command; and a selection valve outputting higher one of a steering side load pressure of a steering actuator and the cargo work side load control pressure output from the control valve as a signal pressure to the first regulator.SELECTED DRAWING: Figure 1

    【課題】ステアリング系ポンプである第1ポンプの作動液を荷役系ポンプである第2ポンプの作動液に合流させる際に第1ポンプの吐出流量を荷役操作指令に応じて制御することができる液圧駆動システムを提供することを目的としている。【解決手段】液圧駆動システムは、第1ポンプと、第2ポンプと、ステアリングバルブを有するステアリング回路と、荷役回路と、優先弁と、入力される信号圧と第1ポンプの吐出圧との差圧に応じて第1ポンプの吐出流量を制御する第1レギュレータと、荷役回路に供給される作動液の液圧である荷役側供給圧を荷役操作指令に応じて調圧した荷役側負荷制御圧を出力する制御弁と、ステアリングアクチュエータのステアリング側負荷圧、及び制御弁から出力される荷役側負荷制御圧の何れか高い方を信号圧として第1レギュレータに出力する選択弁とを備える。【選択図】 図1


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    Title :

    HYDRAULIC DRIVE SYSTEM


    Additional title:

    液圧駆動システム


    Contributors:

    Publication date :

    2022-08-24


    Type of media :

    Patent


    Type of material :

    Electronic Resource


    Language :

    Japanese


    Classification :

    IPC:    E02F Baggern , DREDGING / F15B SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL , Druckmittelbetriebene Systeme allgemein / B62D MOTOR VEHICLES , Motorfahrzeuge



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