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    HYDRAULIC DRIVE DEVICE
    2.
    发明公开
    HYDRAULIC DRIVE DEVICE 有权
    液压驱动装置

    公开(公告)号：EP1630303A1

    公开(公告)日：2006-03-01

    申请号：EP04728031.8

    申请日：2004-04-16

    申请人： HITACHI CONSTRUCTION MACHINERY CO., LTD.

    发明人： ISHIKAWA, Koji ,  KAJITA, Yusuke ,  NAKAMURA, Kazunori ,  SUGIYAMA, Genroku ,  KARASAWA, Hideo

    IPC分类号： E02F9/22

    CPC分类号： E02F9/2235 ,  E02F9/2285 ,  E02F9/2296

    摘要： To permit using hold-side pressure oil in a first hydraulic cylinder for the acceleration of a second hydraulic cylinder upon performing a combined operation of the first and second hydraulic cylinders, a hydraulic drive system is provided with a main hydraulic pump 21, a boom cylinder 6 and an arm cylinder 7, a directional control valve 23 for a boom and a directional control valve 24 for an arm, and a boom control device 25 and an arm control device 26. The hydraulic drive system is also provided with a pressure oil feed means for feeding pressure oil in a rod chamber 6b of the boom cylinder 6 to an upstream side of the directional control valve 24 for the arm when a bottom pressure of the arm cylinder 7 has increased to a high pressure equal to or higher than a predetermined pressure. This pressure oil feed means includes a flow combiner valve 44 arranged in a reservoir line 42 which can communicate to the rod chamber 6b of the boom cylinder 6. When the bottom pressure of the arm cylinder 7 is the predetermined pressure or higher, the flow combiner valve 44 maintains a communication line 40, which communicates the reservoir line 42 and the upstream side of the directional control valve 24 for the arm with each other, in a state that pressure oil can be fed to the upstream side of the directional control valve 24 for the arm.

    摘要翻译： 为了在执行第一和第二液压缸的联合操作时允许在第一液压缸中使用保持侧压力油以加速第二液压缸，液压驱动系统设置有主液压泵21，动臂液压缸 6以及斗杆缸7，动臂用方向控制阀23和斗杆用方向控制阀24以及动臂控制装置25和斗杆控制装置26构成。液压驱动装置还具有压力油供给装置 在斗杆油缸7的底部压力上升到规定值以上的高压时，将斗杆油缸6的活塞杆室6b内的压力油向斗杆用方向控制阀24的上游侧供给的单元 压力。 该压力油供给装置包括设置在能够与动臂油缸6的活塞杆室6b连通的储油管路42中的合流阀44.当臂油缸7的底部压力为预定压力或更高时，合流器 阀44在将压力油供给到方向控制阀24的上游侧的状态下维持使储液器管线42与臂用方向控制阀24的上游侧连通的连通管线40 为胳膊。

    HYDRAULIC DRIVING UNIT
    5.
    发明公开
    HYDRAULIC DRIVING UNIT 有权
    液压天然气

    公开(公告)号：EP1388670A1

    公开(公告)日：2004-02-11

    申请号：EP02771703.2

    申请日：2002-05-13

    申请人： HITACHI CONSTRUCTION MACHINERY CO., LTD.

    发明人： KAJITA, Yusuke

    IPC分类号： F15B11/00 ,  F15B11/02 ,  F15B11/16

    CPC分类号： F15B11/024 ,  E02F9/2203 ,  E02F9/2217 ,  E02F9/2225 ,  E02F9/2282 ,  E02F9/2285 ,  E02F9/2292 ,  F15B11/16 ,  F15B13/0422 ,  F15B21/14 ,  F15B2211/50545 ,  F15B2211/7114 ,  F15B2211/88

    摘要： A hydraulic driving unit is provided with a directional control valve 23 and directional control valve 24 for controlling a boom cylinder 6 and arm cylinder 7, both of which are driven by pressure oil delivered from a main hydraulic pump, respectively, a boom control device 25 for selectively controlling the directional control valve 23 and an arm control device 26 for selectively controlling the directional control valve 24, and is mounted on a hydraulic excavator. To permit effective use of pressure oil in a rod chamber 6a of the boom cylinder 6 when a bottom pressure of the arm cylinder 7 has become high while performing a combined operation such that pressure oil is being supplied to bottom chambers 6a, 7a of the boom cylinder 6 and arm cylinder 7, the hydraulic driving unit is provided with a communication controlling means for bringing the rod chamber 6b of the boom cylinder 6 and the bottom chamber 7a of the arm cylinder 7 into communication with each other when the bottom pressure of the arm cylinder 7 has increased to a high pressure equal to or higher than a predetermined pressure.

    摘要翻译： 液压驱动单元设置有方向控制阀23和用于控制动臂缸6和斗杆缸7的方向控制阀24，两者都分别由从主液压泵输送的压力油驱动，起重臂控制装置25 用于选择性地控制方向控制阀23和用于选择性地控制方向控制阀24的臂控制装置26，并且安装在液压挖掘机上。 为了在臂缸7的底部压力变高时能够有效地利用动臂缸6的杆室6a内的压力油，同时进行组合动作，使得压力油被供给到动臂的下部室6a，7a 气缸6和悬臂气缸7，液压驱动单元设置有连通控制装置，用于当动臂缸6的杆室6b和臂气缸7的底室7a彼此连通时， 臂气缸7已经增加到等于或高于预定压力的高压。

    HYDRAULIC CONTROL SYSTEM IN CONSTRUCTION MACHINE
    6.
    发明公开
    HYDRAULIC CONTROL SYSTEM IN CONSTRUCTION MACHINE 失效
    水力发电机组FÜRERDBAUMASCHINE。

    公开(公告)号：EP0503073A1

    公开(公告)日：1992-09-16

    申请号：EP91915982.2

    申请日：1991-09-11

    申请人： HITACHI CONSTRUCTION MACHINERY CO., LTD.

    发明人： NAKAMURA, Kazunori ,  KAJITA, Yusuke ,  HIRATA, Toichi ,  SUGIYAMA, Genroku ,  ONOUE, Hiroshi ,  TANAKA, Hideaki ,  TOMIKAWA, Osamu ,  HAGA, Masakazu ,  WATANABE, Hiroshi

    IPC分类号： E02F3/43 ,  E02F9/20 ,  E02F9/22

    CPC分类号： E02F9/2285 ,  E02F9/2232 ,  E02F9/2235 ,  E02F9/2296

    摘要： In a controller (229) of a hydraulic control system in a construction machine, a valve control signal calculating function (301), when an operation pattern signal (A-I) of an actuator (201, 202...) is outputted, selects an output pattern from a plurality of output patterns of auxiliary valve control pressure stored in association with the operation pattern signal as a function of a signal of the difference between a discharge pressure of a pump and a maximum load pressure, calculates an auxiliary valve control pressure (Pc) corresponding to the differential signal based on this output pattern, selects a set of corresponding changing speeds (K...K...) from a plurality of sets of changing speeds of auxiliary valve control pressures stored in association with the operation pattern signal, and calculates valve control signals (S21-S26) by combining these auxiliary valve control pressures and changing speeds. A pump control signal calculating function (300), when the operation pattern signal (A-I) is outputted, selects corresponding sets of control gains (LSD, LSU) and of target differential pressures from a plurality of sets of control gains (LSD, LSU) and a plurality of sets of target differential pressures stored in association with the operation pattern signal (A-I), determines a deviation between a differential signal and its target differential pressure, and calculates pump control signals (S11, S12) for decreasing this deviation of differential pressure by use of this deviation of the differential pressure and the selected set of control gains (LSD, LSU), to thereby control a displacement of the hydraulic pump (220).

    摘要翻译： 在施工机械的液压控制系统的控制器（229）中，当输出致动器（201,202 ...）的操作模式信号（AI）时，阀控制信号计算功能（301）选择一个 与作为泵的排出压力和最大负载压力之间的差的信号的函数的与操作模式信号相关联地存储的辅助阀控制压力的多个输出模式的输出模式计算辅助阀控制压力 Pc）基于该输出模式对应于差分信号，从与操作模式相关联地存储的辅助阀控制压力的多组变速组中选择一组相应的变化速度（K ... K ...） 信号，并通过组合这些辅助阀控制压力和变化速度来计算阀控制信号（S21-S26）。 当输出操作模式信号（AI）时，泵控制信号计算功能（300）从多组控制增益（LSD，LSU）​​中选择相应的一组控制增益（LSD，LSU）​​和目标压差， 和与操作模式信号（AI）相关联地存储的多组目标压差，确定差分信号与其目标压差之间的偏差，并且计算用于减小差分偏差的泵控制信号（S11，S12） 通过使用差压的偏差和所选择的一组控制增益（LSD，LSU）​​来施加压力，从而控制液压泵（220）的位移。

    HYDRAULIC DRIVE UNIT
    7.
    发明公开
    HYDRAULIC DRIVE UNIT 有权
    液压驱动单元

    公开(公告)号：EP1541872A1

    公开(公告)日：2005-06-15

    申请号：EP03762902.9

    申请日：2003-07-09

    申请人： Hitachi Construction Machinery Co., Ltd.

    发明人： KAJITA, Yusuke ,  NAKAMURA, Kazunori ,  HIRATA, Toichi

    IPC分类号： F15B11/00 ,  E02F9/22

    CPC分类号： F15B11/06 ,  E02F9/2228 ,  E02F9/226 ,  E02F9/2285 ,  E02F9/2296 ,  F15B11/024 ,  F15B11/028 ,  F15B21/14 ,  F15B2211/20523 ,  F15B2211/20546 ,  F15B2211/20576 ,  F15B2211/30525 ,  F15B2211/3058 ,  F15B2211/3116 ,  F15B2211/31576 ,  F15B2211/329 ,  F15B2211/40507 ,  F15B2211/40515 ,  F15B2211/41545 ,  F15B2211/428 ,  F15B2211/6355 ,  F15B2211/7114 ,  F15B2211/88

    摘要： To permit releasing an excessive rod pressure from a first hydraulic cylinder and also effectively using pressure oil of its rod chamber upon performing such an operation that pressure oil is fed to a bottom chamber of a second hydraulic cylinder, a hydraulic drive unit is provided with a boom cylinder 6, an arm cylinder 7, a communication line 40 communicating a rod chamber 6b of the boom cylinder 6 and a bottom chamber 7a of the arm cylinder 7 with each other, and a switching valve 57 arranged on the communication line 40 for communicating or shutting off the communication line 40 in accordance with a rod pressure of the boom cylinder 6. When an arm-crowding single operation is performed and by its digging counterforce, a rod pressure of the boom cylinder 6 rises to a high pressure of at least a predetermined pressure, the switching valve 57 is changed over from a shut-off position to a communicating position to feed pressure oil from the rod chamber 6b of the boom cylinder 6 to the bottom chamber 7a of the arm cylinder 7. The boom cylinder 6 is hence caused to automatically extend, thereby avoiding lifting of a body of a hydraulic excavator.

    摘要翻译： 为了在第一液压缸释放过大的杆压并且在执行将压力油供给到第二液压缸的底部室的操作时有效地利用其杆腔的压力油，液压驱动单元设置有 动臂缸6，斗杆缸7，使动臂缸6的活塞杆室6b与斗杆缸7的底室7a连通的连通管40，以及配置在连通管40上的切换阀57， 或者根据动臂油缸6的杆压力关闭通信线路40.当进行斗杆单独操作并且通过其挖掘反作用力时，动臂油缸6的杆压力上升到至少高压 在预定的压力下，切换阀57从关闭位置切换到连通位置，以将动臂油缸6的活塞杆室6b的压力油输送到 因此使动臂缸6自动地伸长，从而避免了液压挖掘机的主体的抬起。

    VALVE DEVICE AND HYDRAULIC DRIVING DEVICE
    9.
    发明授权
    VALVE DEVICE AND HYDRAULIC DRIVING DEVICE 失效
    阀和液压驱动系统。

    公开(公告)号：EP0477370B1

    公开(公告)日：1995-10-11

    申请号：EP90916057.4

    申请日：1990-11-01

    申请人： HITACHI CONSTRUCTION MACHINERY CO., LTD.

    发明人： SUGIYAMA, Genroku ,  HIRATA, Toichi ,  KAJITA, Yusuke

    IPC分类号： F15B11/00 ,  F15B11/05

    CPC分类号： E02F9/2232 ,  E02F9/2296 ,  F15B13/0417 ,  F15B2211/30535 ,  F15B2211/5756 ,  Y10T137/87185

    摘要： This invention relates to a valve device comprising a flow control valve (8; 8A-8G) including supply passages (11; 11a, 11b) connected to pressure oil supply sources (1, 2), load passages (12; 12a, 12b) connected to an actuator (4) and first meter-in variable throttle portions (14; 14a, 14b) disposed between the supply passages and the load passages for providing an opening in accordance with an operation quantity; first signal passages (18; 16a, 17a, 16b, 17b, 18) disposed downstream of the first variable throttle portion for detecting the load pressure of the actuator; tank passages (13; 13a, 13b) connected to a tank (56); exhaust passages (30; 16b, 17b, 16a, 17a) for connecting the first signal passage to the tank passage; and second variable throttle portions (21; 21a, 21b) disposed in the exhaust passages, for changing the degree of opening in accordance with the operation quantity of the flow regulation valve to generate a control pressure different from the loadd pressure in the first signal passage, wherein the control pressure of the first signal passage is transmitted to the oil pressure supply source through the second signal passage (19). Auxiliary throttle means (22; 22a, 22b) are disposed in the first signal passage (18; 16a, 17a, 16b, 17b, 18), the load pressure detected at the passage portion (15; 15a, 15b) of the first signal passage is reduced and a pressure lower than the load pressure is generated as the control pressure in the first signal passage.