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    • 3. 发明申请
    • HYDRAULIC DRIVING APPARATUS OF CIVIL ENGINEERING/CONSTRUCTION EQUIPMENT
    • 民用工程/建筑设备液压驱动装置
    • WO1991005958A1
    • 1991-05-02
    • PCT/JP1990001310
    • 1990-10-11
    • HITACHI CONSTRUCTION MACHINERY CO., LTD.HIRATA, ToichiTANAKA, HideakiSUGIYAMA, GenrokuKAJITA, YusukeNAKAMURA, Kazunori
    • HITACHI CONSTRUCTION MACHINERY CO., LTD.
    • F15B11/00
    • F15B13/0417E02F9/2232E02F9/2296Y10T137/7858
    • This invention provides a hydraulic driving apparatus of civil engineering/construction equipment including a hydraulic pump (1), an actuator (2) driven by the pressure oil discharged from this hydraulic pump, a flow rate regulation valve (5) disposed between the hydraulic pump and the actuator, pressure compensation valves (8; 8A; 8B) equipped with a valve spool (23; 23A; 23B) for controlling the pressure difference (PZ - PLS) across this flow rate regulation valve and pump flow rate control means (9) for controlling the discharge flow rate of the hydraulic pump in accordance with the pressure difference (Pd - PLS)) between the pump pressure and the load pressure of the actuator, wherein the pressure compensation valves each include a first control chamber (30; 30A) into which the load pressure (PLS) of the actuator is introduced and which biases the valve spool in the valve opening direction by causing this load pressure to act on the first pressure receiving portion (28; 28A) of the valve spool, a second control chamber (29; 29A) into which the inlet pressure (PZ) of the flow rate regulation valve is introduced and which biases the valve spool in the valve closing direction by causing this inlet pressure to act on the second pressure receiving portion (27; 27A) of the valve spool and target pressure difference setting means (31; 50, 51; 31B, 51) for biasing the valve spool in the valve opening direction and setting the target value of the pressure difference across the flow rate regulation valve. In order to provide the actuator (2) with damping performance, the pressure receiving area (AZ) of the second pressure receiving portion (27; 27A) is made greater than the pressure receiving area (ALS) of the first pressure receiving portion (28; 28A).
    • 10. 发明申请
    • VALVE DEVICE
    • 阀门设备
    • WO1989008213A1
    • 1989-09-08
    • PCT/JP1989000184
    • 1989-02-23
    • HITACHI CONSTRUCTION MACHINERY CO., LTD.SUGIYAMA, GenrokuHIRATA, ToichiTANAKA, HideakiYUASA, KazumasaNOZAWA, Yusaku
    • HITACHI CONSTRUCTION MACHINERY CO., LTD.
    • F16K17/04
    • F15B13/0405F16K15/18
    • An actuator control valve (6) is fitted on a hydraulic machine having a hydraulic pump (1) and a hydraulic actuator (2) driven by a pressure oil discharged from this hydraulic pump. This valve device has a meter-in circuit (4) adapted to introduce the pressure oil discharged from the hydraulic pump into the actuator, and a meter-out circuit (5) adapted to introduce a return oil from the actuator into a tank (3). The meter-out circuit is provided with pilot circuits (24a, 24b) including a main valve (22) for controlling the return oil from the actuator, and a variable throttle means (23), which main valve is adapted to be closed when the pilot circuits are closed, and to vary the degree of opening of itself in accordance with the throttling rate of the variable throttle means, and control means (27-31) adapted to vary the throttling rate of the variable throttle means in accordance with the driving pressure of the actuator.
    • 执行器控制阀(6)安装在具有液压泵(1)和由从该液压泵排出的压力油驱动的液压致动器(2)的液压机上。 该阀装置具有适于将从液压泵排出的压力油引入致动器的计量回路(4),以及用于将来自致动器的回油引入罐(3)中的出口回路(5) )。 出口电路设置有包括用于控制来自致动器的返回油的主阀(22)和可变节流装置(23)的先导电路(24a,24b),该主阀适于在 先导电路关闭,并且根据可变节流装置的节流率来改变其自身的开度;以及控制装置(27-31),其适于根据驾驶改变可变节流装置的节流速度 执行机构的压力。