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    • 8. 发明授权
    • HYDRAULIC SYSTEM
    • 液压系统
    • EP0536398B1
    • 1996-07-10
    • EP91909094.4
    • 1991-05-15
    • KABUSHIKI KAISHA KOMATSU SEISAKUSHO
    • AKIYAMA, Teruo, Kabushiki Kaisha KomatsuSHIRAI, Kiyoshi, Kabushiki Kaisha KomatsuISHIZAKI, Naoki, Kabushiki Kaisha KomatsuYAMASHITA, Koji, Kabushiki Kaisha KomatsuSHINOZAKI, Shinichi, Kabushiki Kaisha Komatsu
    • F15B11/00F15B11/05F15B11/16
    • E02F9/2232F15B11/163F15B11/165F15B13/0417F15B2211/20553F15B2211/3054F15B2211/3111F15B2211/3144F15B2211/40515F15B2211/40569F15B2211/413F15B2211/455F15B2211/6052F15B2211/6054F15B2211/6058F15B2211/7052F15B2211/71
    • A hydraulic system (1) according to the first invention, wherein intermediate pressures between pressures at the inlets and the outlets of first and second pressure compensated valves (4), (4') are caused to act on pressure-receiving surfaces (4b), (4b') on the flowrate decreasing side through first and second intermediate pressure supplying means (13), (13'), so that errors in operation and malfunctions of the pressure compensated valves (4), (4') can be controlled. A hydraulic system (20) according to the second invention, wherein control valves (3), (3') are in neutral positions, holding pressures of hydraulic actuators (5), (5') are caused to act on pressure-receiving surfaces (4b), (4b') on the flowrate decreasing side of the compensated valves (4), (4') so as to hold a spool in a position of compensation, so that responsiveness of the hydraulic actuators (5), (5') to the lever operations can be improved. A hydraulic system (30) according to the third invention, wherein at least one of the areas of the pressure-receiving surfaces (4a), (4a') on the flowrate increasing side of the pressure compensated valves (4), (4') is set larger than the area of the pressure-receiving surfaces (4b), (4b') on the flowrate decreasing side so as to decrease the accuracy of the pressure compensation, so that the maximal operation speeds of the hydraulic actuators (5), (5') can be prevented from being lowered.
    • 根据第一发明的液压系统(1),其中使第一和第二压力补偿阀(4),(4')的入口和出口处的压力之间的中间压力作用在受压表面(4b)上, ,通过第一和第二中间压力供应装置(13),(13')在流量减小侧上的流量减小侧(4b'),从而可以控制压力补偿阀(4),(4')的操作错误和故障 。 根据第二发明的液压系统(20),其中,控制阀(3),(3')处于中立位置,使液压致动器(5),(5')的保持压力作用于压力接收表面 (4),(4')的流量减少侧的流量控制阀(4b),(4b'),以将阀芯保持在补偿位置,从而液压致动器(5), ')的杠杆操作可以得到改善。 根据第三发明的液压系统(30),其中压力补偿阀(4),(4')的流量增加侧上的受压面(4a),(4a')中的至少一个面积, )比流量减少侧的受压面(4b),(4b')的面积大,以降低压力补偿的精度,所以液压致动器(5)的最大运转速度, ,可以防止(5')降低。
    • 9. 发明公开
    • HYDRAULIC CIRCUIT SYSTEM
    • HYDRAULIKKREISLAUF。
    • EP0515692A1
    • 1992-12-02
    • EP91920811.6
    • 1991-11-29
    • KABUSHIKI KAISHA KOMATSU SEISAKUSHO
    • KARAKAMA, Tadao, Kawasaki Factory of K.K.KomatsuAKIYAMA, Teruo, Kawasaki Factory of K.K. Komatsu
    • F15B11/00F15B11/05F15B11/16E02F9/22
    • E02F9/2285E02F9/2225E02F9/2232E02F9/2235E02F9/2296F15B11/163F15B2211/20553F15B2211/25F15B2211/3054F15B2211/3111F15B2211/329F15B2211/50518F15B2211/55F15B2211/6054F15B2211/71
    • A hydraulic circuit system wherein errors in flowrate distribution of pressure oil from a hydraulic pump to a plurality of hydraulic actruators can be reduced, supply of pressure oil can be quickly performed, a circuit configuration can be simplified and the system can be produced at low costs. The system comprises: a plurality of control valves (15) provided in circuits (10a, 17) connected between a hydraulic pump (10) and a plurality of hydraulic actuators (16); a plurality of pressure compensation valves (18) which can be set at the highest load pressure from among the load pressures acting on the respective hydraulic actuators; and load pressure detecting ports (37) connected to a load pressure introduction path (23) through a check valve (42) and provided on control valves (15) in a manner to detect intermediate pressures between pressures on the inlet sides and on the outlet sides of the respective pressure compensation valves (18) from within control valves when the respective control valves (15) are set at pressure oil supply positions (I or II). First pressure receiving portions (19) for pressing the pressure compensation valves (18) in the blocking directions are connected to a load pressure introduction path (23) in such a manner that load pressures can be detected at the ports from pressure oil inlet sides of the pressure compensation valves (18), and, on the other hand, second pressure receiving portions (21) for pressing the pressure compensation valves (18) in the communicating directions are connected to the pressure oil outlet side of the control valve (15).
    • 一种液压回路系统,其中可以减少从液压泵到多个液压执行器的压力油的流量分布误差,可以快速地提供压力油,可以简化电路配置并且可以以低成本生产系统 。 该系统包括:连接在液压泵(10)和多个液压致动器(16)之间的电路(10a,17)中的多个控制阀(15)。 多个压力补偿阀(18),其可以从作用在各个液压致动器上的负载压力中设定在最高负载压力; 以及通过止回阀(42)连接到负载压力引入路径(23)并且设置在控制阀(15)上的负载压力检测端口(37),以检测入口侧和出口之间的压力之间的中间压力 当各个控制阀(15)设置在压力供油位置(I或II)时,各个压力补偿阀(18)的侧面从控制阀内。 用于按阻力方向按压压力补偿阀18的第一压力接收部分19连接到负载压力引入路径23,使得能够在压力油入口侧的端口处检测负载压力, 压力补偿阀18和另一方面用于在连通方向上按压压力补偿阀18的第二压力接收部21连接到控制阀15的压力油出口侧。 。