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1. 发明公开

EP0596140A4 EP0596140A4 - 有权
标题翻译： EP0596140A4 - Google专利
公开(公告)号：EP0596140A4
公开(公告)日：1994-08-31
申请号：EP93910375
申请日：1993-05-21
申请人： HITACHI CONSTRUCTION MACHINERY CO., LTD.
发明人： NOZAWA, YUSAKU , OHTSU, WATARU , ICHIKI, NOBUHIKO , INO, KAZUYUKI , MATSUZAKI, HIROSHI , TAKAHASHI, KINYA
IPC分类号： E02F9/22 , F15B11/00 , F15B11/05 , F15B11/17 , F15B13/04
CPC分类号： E02F9/2296 , E02F9/2232 , E02F9/2239 , E02F9/2292 , F15B11/17 , F15B13/0417 , F15B2211/20553 , F15B2211/30595 , F15B2211/40515 , F15B2211/40569 , F15B2211/50536 , F15B2211/5157 , F15B2211/6052 , F15B2211/6309 , F15B2211/6313 , F15B2211/7142
摘要： There are provided: a check valve (cb1) for detecting pressure at the outlet side of a pressure compensator (VB1); a maximum load pressure detecting pipeline (SL1) for selecting a higher pressure out of a pressure detected by said check valve (cb1) and a load pressure of an actuator belonging to a hydraulic pump (P1), to thereby supply it as a signal pressure; a check valve (cb2) for detecting a pressure at the outlet side of a pressure compensator (VB2); a maximum load pressure detecting pipeline (SL2) being independent of said maximum load pressure detecting pipeline (SL1) for selecting a higher pressure out of a pressure detected by said check valve (cb2) and a load pressure of an actuator belonging to a second hydraulic pump (P2), to thereby supply it as a signal pressure; and a path (300) for merging the pressure oils from the first and second hydraulic pumps (P1 and P2), which have flowed out of variable throttles (RB1 and RB2), to thereby supply it to an actuator (B). With this arrangement, said two hydraulic pumps (P1 and P2) can have independence of each secured.
摘要翻译：提供：用于检测压力补偿器（VB1）的出口侧处的压力的止回阀（cb1）; 一个用于选择由所述止回阀（cb1）检测到的压力中的较高压力和属于液压泵（P1）的致动器的负载压力中的较高压力的最大负载压力检测管路（SL1），从而将其作为信号压力 ; 检测压力补偿器（VB2）出口侧压力的止回阀（cb2）; 最大负载压力检测管路（SL2）独立于所述最大负载压力检测管路（SL1），用于从由所述止回阀（cb2）检测到的压力中选择较高的压力，以及属于第二液压的致动器的负载压力泵（P2），从而将其作为信号压力供应; 以及用于合并来自已经从可变节流阀（RB1和RB2）流出的第一和第二液压泵（P1和P2）的压力油从而将其供应到致动器（B）的路径（300）。利用这种布置，所述两个液压泵（P1和P2）可以独立于每个液压泵。

2. 发明公开

EP0362409A4 HYDRAULIC DRIVING UNIT 失效
标题翻译：液压驱动单元
公开(公告)号：EP0362409A4
公开(公告)日：1990-10-03
申请号：EP89903799
申请日：1989-03-22
申请人： HITACHI CONSTRUCTION MACHINERY CO., LTD.
发明人： HIRATA, TOICHI , TANAKA, HIDEAKI , SUGIYAMA, GENROKU , NOZAWA, YUSAKU
IPC分类号： E02F9/22 , F15B11/16 , F15B13/04 , F15B11/00
CPC分类号： F15B11/165 , E02F9/2225 , E02F9/2232 , E02F9/2296 , F15B11/163 , F15B13/0417 , F15B2211/20553 , F15B2211/253 , F15B2211/30505 , F15B2211/30535 , F15B2211/3055 , F15B2211/3111 , F15B2211/324 , F15B2211/351 , F15B2211/353 , F15B2211/6051 , F15B2211/6054 , F15B2211/7053 , F15B2211/7135 , Y10T137/87193
摘要： A hydraulic driving unit having at least one hydraulic pump (1), a plurality of hydraulic actuators (2, 3) adapted to be driven by the pressure oil discharged from the hydraulic pump, tanks (4) into which the return oil from the hydraulic actuators is discharged, flow rate control valve means (14, 18) provided in the hydraulic actuators and including first main variable throttle means (23A, 23B) for controlling the flow rate of the pressure oil supplied from the hydraulic pump to the hydraulic actuators, and second main variable throttle means (24A, 24B) for controlling the flow rate of the return oil discharged from the hydraulic actuators to the tanks, a pump control means (22) for controlling the discharge rate of the hydraulic pump normally in response to a difference between the discharge pressure of the hydraulic pump and a maximum load pressure of the hydraulic actuators so that the discharge pressure of the pump becomes higher than the maximum load pressure by a certain quantity, and first pressure compensation control means (15, 19) adapted to be operated with a value, which is determined by the difference between the discharge pressure of the pump and the maximum load pressure, as a target compensation differential pressure and control the pressure compensation of the first main variable throttle means in the flow rate control valve means, wherein the hydraulic driving unit further includes second pressure compensation control means (16, 20) adapted to be operated with a value, which is determined by a longitudinal differential pressure of the first main variable throttle means (23A, 23B), as a target compensation differential pressure and control the second main variable throttle means (24A, 24B) in the flow rate control valve means (14, 18).

3. 发明公开

EP0354972A4 VALVE DEVICE 失效
标题翻译：阀门设备
公开(公告)号：EP0354972A4
公开(公告)日：1990-09-19
申请号：EP89902812
申请日：1989-02-23
申请人： HITACHI CONSTRUCTION MACHINERY CO., LTD.
发明人： SUGIYAMA, GENROKU , HIRATA, TOICHI , TANAKA, HIDEAKI , YUASA, KAZUMASA , NOZAWA, YUSAKU
IPC分类号： F15B13/04 , F16K15/18 , F16K17/04 , F15B11/02
CPC分类号： F15B13/0405 , F16K15/18
摘要： 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.

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