公开(公告)号：WO9838429A9

公开(公告)日：1999-04-22

申请号：PCT/JP9800781

申请日：1998-02-26

Applicant: HITACHI CONSTRUCTION MACHINERY ,  SUGIYAMA GENROKU ,  HIRATA TOICHI ,  TOYOOKA TSUKASA

Inventor： SUGIYAMA GENROKU ,  HIRATA TOICHI ,  TOYOOKA TSUKASA

IPC: E02F9/22 ,  F15B11/00 ,  F15B11/05

CPC classification number: E02F9/2225 ,  E02F9/2285 ,  E02F9/2296 ,  F15B11/05 ,  F15B2211/30525 ,  F15B2211/3111 ,  F15B2211/329 ,  F15B2211/40515 ,  F15B2211/41563 ,  F15B2211/428 ,  F15B2211/45 ,  F15B2211/50527 ,  F15B2211/5159

Abstract: A hydraulic drive device which has a closed center type direction switching valve (2) which is connected to a hydraulic pump (50) through a pressure oil feed passage (3) to control flow of a pressure oil fed to an actuator (51). The hydraulic drive device comprises a throttle shutoff means (11) provided on an unload circuit (10), which connects the pressure oil feed passage (3) to a tank (53), for throttling and shutting off the unload circuit (10) in accordance with a control input of the direction switching valve (2), the throttle shutoff means comprising a logic valve (12) having a feedback slit (12b), of which opening area is increased or decreased in accordance with an amount of movement of a valve disc (12a), and a pilot variable throttle (13) for controlling an amount of pilot flow passing through the feedback slit (12b) in accordance with a control input of the direction switching valve (2). Accordingly, the closed center type direction switching valve is shortened in axial length of a spool of the direction switching valve as compared with an open center type direction switching valve, achieves an improvement in working accuracy and compactness, and can function in an equivalent manner to an open center type direction switching valve without the use of any controller.

Abstract translation: 一种液压驱动装置，其具有封闭的中心型方向切换阀（2），其通过压力油供给通路（3）连接到液压泵（50），以控制供给到致动器（51）的压力油的流量。 液压驱动装置包括设置在卸载回路（10）上的节气门关闭装置（11），其将压力供油通道（3）连接到箱（53），用于节流和关闭卸载回路（10） 根据方向切换阀（2）的控制输入，节气门关闭装置包括具有反馈狭缝（12b）的逻辑阀（12），其中开口面积根据a的移动量而增大或减小 以及根据方向切换阀（2）的控制输入来控制通过反馈狭缝（12b）的先导流量的先导可变节流阀（13）。 因此，与开式中心型方向切换阀相比，封闭的中心型方向切换阀在方向切换阀的阀芯的轴向长度上缩短，实现了加工精度和紧凑性的提高，能够以相当于 开式中心型方向切换阀，不使用任何控制器。

公开(公告)号：WO1997022914A1

公开(公告)日：1997-06-26

申请号：PCT/JP1996002517

申请日：1996-09-05

Applicant: HITACHI CONSTRUCTION MACHINERY CO., LTD. ,  KOWATARI, Youichi ,  HIRATA, Toichi ,  TAKEGAHARA, Hidefumi ,  TOYOOKA, Tsukasa ,  ISHIKAWA, Kouji ,  SUGIYAMA, Genroku ,  YOSHINAGA, Shigehiro

Inventor： HITACHI CONSTRUCTION MACHINERY CO., LTD.

IPC: G05B11/36

CPC classification number: G05B24/02 ,  E02F9/2025 ,  E02F9/2235 ,  E02F9/2282 ,  E02F9/2285 ,  E02F9/2296 ,  F04B49/065 ,  F04B2201/12041 ,  F04B2203/0201 ,  F04B2205/062 ,  G05B11/36 ,  G05B13/0265

Abstract: When a mode signal Sm of a mode switch (13) is ON, an arithmetic unit (12a) of a controller (12) executes learning control in which a driving current (I) corresponding to a predetermined target pump rotation theta 0 is supplied to a proportional solenoid valve (3) to determine the difference between the target pump rotation theta 0 and actual pump rotation theta and the difference is stored as a corrective value DELTA theta 0 in an EEPROM of a memory unit (12b). When the mode signal Sm of the mode switch (13) is OFF, the arithmetic unit executes normal control in which the corrective value DELTA theta 0 stored in the memory unit (12b) is added to the target pump rotation theta 0 and a driving current (I) corresponding to this corrected target pump rotation theta 0 is supplied to the proportional solenoid valve (3). Therefore, even when any variance exists in the input/output characteristics of a regulator as displacement control means (control objet) of a hydraulic pump and the proportional solenoid valve, variance of actual pump rotation as the output of the control object can be reduced.

Abstract translation: 当模式开关（13）的模式信号Sm为ON时，控制器（12）的运算单元（12a）执行学习控制，其中对应于预定目标泵旋转θ0的驱动电流（I）被提供给 用于确定目标泵旋转θ0和实际泵旋转θ之间的差的比例电磁阀（3），并且差值作为校正值DELTAθ0存储在存储器单元（12b）的EEPROM中。 当模式开关（13）的模式信号Sm为OFF时，运算单元执行正常控制，其中将存储在存储单元（12b）中的校正值DELTAθ0添加到目标泵旋转θ0和驱动电流 对应于该校正的目标泵旋转θ0的（I）被提供给比例电磁阀（3）。 因此，即使在作为液压泵和比例电磁阀的位移控制装置（控制对象）的调节器的输入/输出特性中存在任何差异的情况下，也可以减少作为控制对象的输出的实际泵旋转的变化。

公开(公告)号：WO1996027741A1

公开(公告)日：1996-09-12

申请号：PCT/JP1996000498

申请日：1996-03-01

Applicant: HITACHI CONSTRUCTION MACHINERY CO., LTD. ,  SUGIYAMA, Genroku ,  HIRATA, Toichi

Inventor： HITACHI CONSTRUCTION MACHINERY CO., LTD.

IPC: F15B20/00

CPC classification number: F15B21/045 ,  F04B49/065 ,  F04B49/08 ,  F04B49/10 ,  F04B2205/05 ,  F04B2205/062 ,  F04B2205/11 ,  F15B20/002

Abstract: In a hydraulic controller, in order to easily provide a hydraulic back-up in the event of a failure of an electric system while maintaining a benefit of electrical control using a control unit (13) when controlling a displacement of a hydraulic pump (1) in accordance with a property of a hydraulic driving system, a pump regulator (16) is constructed such that the tilt theta of a swash plate (1a) increases as the pressure of a second oil pressure signal P.c decreases, the pump regulator is characterized in that a negative control pressure can be used instead of the second oil pressure signal, and the properties of a fixed throttle (10) and the pump regulator spring (18d) are set such that the pump regulator can be operated within an operation range of the negative control pressure. In a controlling unit (13), a negative control pressure Pc1 corrected in a block (102) is made to be a target value of the second oil pressure signal, a second electric signal E corresponding to the target value is obtained, and the operational range of a second oil pressure signal generated by a solenoid proportional valve (15) is made substantially equal to the negative control pressure.

Abstract translation: 在液压控制器中，为了在控制液压泵（1）的位移时，在维持使用控制单元（13）的电控制的同时保持电气控制的故障的情况下容易地提供液压备用， 根据液压驱动系统的特性，泵调节器16被构造成使得当第二油压信号Pc的压力降低时斜盘（1a）的倾斜角度增加，泵调节器的特征在于 可以使用负控制压力代替第二油压信号，并且设定固定节气门（10）和泵调节器弹簧（18d）的特性，使得泵调节器可以在 负控制压力。 在控制单元（13）中，将块（102）中校正的负控制压力Pc1设定为第二油压信号的目标值，获得与目标值对应的第二电信号E， 由电磁比例阀（15）产生的第二油压信号的范围基本上等于负控制压力。

公开(公告)号：WO1995015441A1

公开(公告)日：1995-06-08

申请号：PCT/JP1994002008

申请日：1994-11-30

Applicant: HITACHI CONSTRUCTION MACHINERY CO. LTD. ,  HIRATA, Toichi ,  SUGIYAMA, Genroku ,  WATANABE, Hiroshi ,  YOSHINAGA, Shigehiro

Inventor： HITACHI CONSTRUCTION MACHINERY CO. LTD.

IPC: F15B11/00

CPC classification number: E02F9/2235 ,  E02F9/2282 ,  E02F9/2285 ,  E02F9/2296

Abstract: A controller (24) is provided with function generators (151 and 152). The generator (151) has such a characteristic that a first target tilt amount theta N increases from a minimum value to a maximum value as the detected value PN of a pressure sensor (21) for negative control pressure decreases; the generator (152) has such a characteristic that a second target tilt amount theta B increases from a prescribed minimum value to the same maximum value as the detected value PB of the manipulated variable (pilot pressure) for driving a boom cylinder increases. The controller (24) selects the smaller one out of the two target tilt amounts and drives a proportional solenoid valve (25) based on the smaller value. Therefore, undesired speed increase of such a specific hydraulic actuator as a swinging motor (9), etc., other than boom cylinders which occurs at the time of controlling the tilt amount in accordance with a negative control pressure can be suppressed.

Abstract translation: 控制器（24）设置有功能发生器（151和152）。 发电机（151）具有这样的特征：随着负压控制压力的压力传感器（21）的检测值PN减小，第一目标倾斜量θN从最小值增加到最大值; 发电机152具有使第二目标倾斜量θB从规定的最小值增加到与用于驱动动臂缸的驾驶操作量（先导压力）的检测值PB增大的相同的最大值的特性。 控制器（24）选择两个目标倾斜量中的较小的一个，并且基于较小的值驱动比例电磁阀（25）。 因此，可以抑制在根据负控制压力控制倾斜量时发生的除了动臂缸之外的诸如摆动马达（9）等的特定液压致动器的不期望的速度增加。

公开(公告)号：WO1994010456A1

公开(公告)日：1994-05-11

申请号：PCT/JP1993001558

申请日：1993-10-28

Applicant: HITACHI CONSTRUCTION MACHINERY CO., LTD. ,  SUGIYAMA, Genroku ,  HIRATA, Toichi ,  NOZAWA, Yusaku ,  OCHIAI, Masami

Inventor： HITACHI CONSTRUCTION MACHINERY CO., LTD.

IPC: F15B11/00

CPC classification number: E02F9/2225 ,  F15B13/0417

Abstract: A hydraulic control valve device provided with spool type flow rate control valves (200A, 201A; 200; 204), wherein in order to control a flow rate of pressure oil supplied from a pump path (5) to a pair of main variable throttles (16A, 16B) through a feeder path (7) and to control a flow rate of pressure oil flowing into a pair of load paths (6A, 6B) in an auxiliary manner, direction changing-over valve devices (100A; 101A; 102A; 103A; 105A; 106A; 107A; 108A; 110A; 111A; 112A; 113A; 114A) comprises: (a) seat valves (300, 301) provided in the feeder path, having a seat valve body (20) movably provided in a housing (1) and forming an auxiliary variable throttle (28) in the feeder path and a variable control throttle (33) formed on the seat valve body, for varying an opening area in response to a distance of move of the seat valve body; (b) pilot lines (24, 29 - 31, 35 - 37) for allowing communication between the upstream side (7C) of the auxiliary variable throttle of the feeder path and the downstream sides (7A, 7B) of the feeder path through the variable control throttle to determine a distance of move of the seat valve body by a flow rate of pressure oil flowing through the above-described lines; and (c) pilot flow rate control valves (400; 401; 403; 405; 406; 407; 408) each having a pilot variable throttle (45) in a pilot line and means for receiving flow rate control signals to be input (800, 52 - 59, 159, 54 - 59, 231A, 231B, 251, 252), for varying an opening area of the pilot variable throttle in response to input flow rate control signals to thereby control flow rates of pressure oil flowing through the pilot lines.

Abstract translation: 一种具有阀芯型流量控制阀（200A，201A; 200; 204）的液压控制阀装置，其中为了控制从泵通路（5）供给到一对主可变节流阀 通过馈送路径（7）进行控制，并且以辅助方式控制流入一对负载路径（6A，6B）的压力油的流量，方向转换阀装置（100A; 101A; 102A; 103A; 105A; 106A; 107A; 108A; 110A; 111A; 112A; 113A; 114A）包括：（a）设置在所述馈送路径中的座阀（300,301），具有座位阀体（20） 壳体（1），并且在供给路径中形成辅助可变节流阀（28）和形成在座阀体上的可变控制节流阀（33），用于响应于座阀主体的移动距离改变开口面积; （b）用于允许馈送路径的辅助可变节流阀的上游侧（7C）与馈送通路的下游侧（7A，7B）之间的连通的先导管路（24,29,31,35-37），通过 可变控制节气门，以通过流过上述管线的压力油的流量来确定座阀主体的移动距离; 和（c）在先导管路中各自具有先导可变节流阀（45）的先导流量控制阀（400; 401; 403; 405; 406; 407; 408）和用于接收要输入的流量控制信号的装置（800 ，52-59,159,54-59,231A，231B，251,252），用于响应于输入流量控制信号改变所述先导可变节流阀的开口面积，从而控制流过所述导向件的压力油流量 线。

公开(公告)号：WO1993018308A1

公开(公告)日：1993-09-16

申请号：PCT/JP1993000287

申请日：1993-03-09

Applicant: HITACHI CONSTRUCTION MACHINERY CO., LTD. ,  HIRATA, Toichi

Inventor： HITACHI CONSTRUCTION MACHINERY CO., LTD.

IPC: F15B11/00

CPC classification number: E02F9/2296 ,  E02F9/2235 ,  F15B11/165 ,  F15B21/087 ,  F15B2211/20553 ,  F15B2211/20584 ,  F15B2211/30525 ,  F15B2211/3111 ,  F15B2211/31576 ,  F15B2211/327 ,  F15B2211/329 ,  F15B2211/351 ,  F15B2211/40515 ,  F15B2211/41563 ,  F15B2211/428 ,  F15B2211/45 ,  F15B2211/50536 ,  F15B2211/528 ,  F15B2211/6054 ,  F15B2211/6346 ,  F15B2211/6355

Abstract: An unloading valve adapted to open when a pressure difference between a discharge pressure and a maximum load pressure in a hydraulic pump exceeds a predetermined value and to make a flow quantity discharged from the hydraulic pump flow into a tank is connected to the hydraulic pump, a fixed throttle for producing control pressure corresponding to a flow quantity flowing out from the unloading valve is connected to the downstream side of the unloading valve, and a control device of the hydraulic pump is constructed such that, when the control pressure is high, the discharge flow rate of the hydraulic pump is decreased and, when the control pressure is low, the discharge flow rate is increased. Furthermore, in parallel to the unloading valve, and on the upstream side of the fixed throttle, a change-over valve is connected to the hydraulic pump, and this change-over valve is controlled such that, when the control input of a control lever is small, the opening area of the change-over valve is large, and, as the control input of the control lever is large, the opening area becomes small. With this arrangement, according to the control input of an operating means, either LS control by the unloading valve or bleed-off control by the change-over valve is performed selectively, so that a flow rate control utilizing the characteristics of the both controls can be performed.

Abstract translation: 当液压泵中的排出压力和最大负载压力之间的压力差超过预定值并使从液压泵流入罐中的流量连接到液压泵时，卸载阀连接到液压泵， 用于产生与从卸荷阀流出的流量相对应的控制压力的固定节流阀连接到卸载阀的下游侧，并且液压泵的控制装置构造成使得当控制压力高时， 液压泵的流量减少，当控制压力低时，排出流量增加。 此外，与卸载阀并联，并且在固定节流阀的上游侧，与液压泵连接有转换阀，并且该转换阀被控制成使得当控制杆的控制输入 转换阀的开口面积小，并且随着控制杆的控制输入量大，开口面积变小。 通过这种结构，根据操作装置的控制输入，选择性地执行卸载阀的LS控制或换向阀的排出控制，使得利用两个控制的特性的流量控制可以 被执行。

公开(公告)号：WO1990011413A1

公开(公告)日：1990-10-04

申请号：PCT/JP1990000375

申请日：1990-03-20

Applicant: HITACHI CONSTRUCTION MACHINERY CO., LTD. ,  TANAKA, Hideaki ,  HIRATA, Toichi ,  SUGIYAMA, Genroku ,  HAGA, Masakazu ,  KAJITA, Yusuke

Inventor： HITACHI CONSTRUCTION MACHINERY CO., LTD.

IPC: E02F03/43

CPC classification number: E02F9/2235 ,  E02F9/2228 ,  E02F9/2285 ,  E02F9/2292 ,  E02F9/2296

Abstract: A hydraulic drive unit provided with a hydraulic pump (11, 11A), a plurality of actuators (4-6) driven by a pressure oil supplied from the hydraulic pump, which include an arm cylinder (5) and a boom cylinder (4), a plurality of flow rate control valves (12, 14, 16) adapted to control the flows of the pressure oil supplied to these actuators, which include an arm direction control valve (14) and a boom direction control valve (12), and a plurality of divided flow compensating valves (13, 15, 17; 13A, 15A, 17A) adapted to control the pressure differences across these flow rate control valves and having driving means (13d, 15d, 17d; 13e, 13f, 15e, 15f, 17e, 17f) for setting target levels of pressure differences across the corresponding flow rate control valves. It is characterized in that it has a first means (21) for detecting an arm crowding action made by driving the arm cylinder (5), and second means (24, 30, 31; 24, 30A, 31) for controlling the driving means (15d, 15f) for the corresponding divided flow compensating valves (15; 15A) so that the target level of pressure difference across at least the flow rate control vale (14) related to the arm cylinder decrease when an arm crowding action is detected.

公开(公告)号：WO1990008263A1

公开(公告)日：1990-07-26

申请号：PCT/JP1990000048

申请日：1990-01-18

Applicant: HITACHI CONSTRUCTION MACHINERY CO., LTD. ,  TATSUMI, Akira ,  HIRATA, Toichi ,  HAGA, Masakazu ,  IZUMI, Eiki

Inventor： HITACHI CONSTRUCTION MACHINERY CO., LTD.

IPC: F15B11/00

CPC classification number: F16H61/4078 ,  B60W10/06 ,  E02F9/2235 ,  E02F9/2246 ,  E02F9/2296 ,  F15B2211/20553 ,  F15B2211/253 ,  F15B2211/50536 ,  F16H61/433 ,  F16H2059/6846

Abstract: This invention relates to a hydraulic driving unit provided with: an engine (1); a variable capacity hydraulic pump (2) driven by said engine; at least one hydraulic actuator driven by oil delivered from the pump (6); a control valve means (8) for interconnecting the hydraulic pump and actuator and controlling the flow rate of hydraulic fluid fed to the actuator according to the degree of operation of an operating means (58); a pump control means (17) for controlling the displacement volume of the hydraulic pump according to the degree of operation of the operating means so that the discharge quantity of the hydraulic pump increases as the aforesaid degree of operation increases; and an engine control means (29) for controlling the RPM of the engine. The engine control means (29) monitors whether or not the discharge quantity of the hydraulic pump (2) reaches saturation and, when a specified saturation condition is reached by hydraulic pump, it can exhibit such functions (33, 36) as increasing the RPM of the engine (1) and eliminating saturation.

公开(公告)号：WO1989011041A1

公开(公告)日：1989-11-16

申请号：PCT/JP1989000479

申请日：1989-05-10

Applicant: HITACHI CONSTRUCTION MACHINERY CO., LTD. ,  HIRATA, Toichi ,  SUGIYAMA, Genroku ,  KAJITA, Yusuke

Inventor： HITACHI CONSTRUCTION MACHINERY CO., LTD.

IPC: F15B11/05

CPC classification number: F15B21/087 ,  E02F9/2225 ,  E02F9/2232 ,  E02F9/2296 ,  F15B11/163 ,  F15B13/0417 ,  F15B2211/20553 ,  F15B2211/25 ,  F15B2211/30535 ,  F15B2211/3057 ,  F15B2211/3111 ,  F15B2211/329 ,  F15B2211/50527 ,  F15B2211/50536 ,  F15B2211/5157 ,  F15B2211/526 ,  F15B2211/55 ,  F15B2211/6054 ,  F15B2211/6313 ,  F15B2211/6654 ,  F15B2211/7058 ,  F15B2211/71

Abstract: A hydraulic drive unit comprises a hydraulic pump (1), a plurality of hydraulic actuators (2, 3) driven by the hydraulic oil supplied from the hydraulic pump, a plurality of flow rate control valves (4, 5) for controlling the flow of the hydraulic oil, and a plurality of branch flow compensating valves (6, 7) for respectively controlling the differential pressure preceding or following each of the flow rate control valves, the plurality of actuators (2, 3) including a first actuator (2) whose load pressure tends to become relatively large and a second actuator (3) whose load pressure is smaller than that of the first actuator. Branch flow control means (22, 33) are provided to control the branch flow compensating valve (7) involved in controlling the second actuator in such a manner that, while the first and second actuators (2, 3) are being driven on a multiplicable basis, the preceding and following pressure (Pz2-P12) of the flow rate control valve (5) involved in the second actuator (3) is made greater than the pressure (Pz1-P11) thereof.

公开(公告)号：WO1988001706A1

公开(公告)日：1988-03-10

申请号：PCT/JP1987000635

申请日：1987-08-27

Applicant: HITACHI CONSTRUCTION MACHINARY CO., LTD. ,  HIRATA, Toichi ,  TANAKA, Hideaki ,  SUGIYAMA, Genroku ,  SATOH, Shinichi

Inventor： HITACHI CONSTRUCTION MACHINARY CO., LTD.

IPC: F16K31/122

CPC classification number: F15B13/0402 ,  F15B13/0422 ,  F15B21/044 ,  Y10T137/8663

Abstract: A hydraulic pilot type direction control valve, in which a pilot pressure oil is introduced into at least one pilot hydraulic chamber (40, 41; 76), which is formed in a block (39; 64; 75) in hydraulic pilot operating portions (32, 33; 61; 72), to drive spools (37, 38; 74). A drain passage (54; 82) is formed in the vicinity of the pilot hydraulic chambers (40, 41; 76) in the block (39; 64; 75), and the pilot hydraulic chambers and this drain passage are communicating with each other via very narrow passage means (52, 53; 83) used as air vents.