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1. 发明授权

KR850001244B1 FLUSHING VALVE SYSTEM IN CLOSED CIRCUIT HYDROSTATIC POWER TRANSMISSION 失效
公开(公告)号：KR850001244B1
公开(公告)日：1985-08-23
申请号：KR820000904
申请日：1982-02-27
申请人： HITACHI CONSTRUCTION MACHINERY
发明人： IZUMI EIKI , AOYAKI YUKIO , NAKAZIMA KICHIO , WATANABE HIROSHI , HONMA KATSO
IPC分类号： F15B11/08 , F16H39/02 , F16H61/40 , F16H61/4008 , F16H61/4104 , F16H61/4139

2. 发明授权

KR860000756B1 CONTROL SYSTEM OF HYDRAULIC CIRCUIT APPARATUS 失效
公开(公告)号：KR860000756B1
公开(公告)日：1986-06-18
申请号：KR820003322
申请日：1982-07-24
申请人： HITACHI CONSTRUCTION MACHINERY
发明人： WATANABE HIROSHI , AOYAKI YUKIO , NAKAZIMA KICHIO , IZUMI EIKI , HONMA KATSUO
IPC分类号： F15B11/16 , E02F9/20 , E02F9/22 , F15B11/17 , F15B21/08
摘要： A control for hydraulic circuit for crane or excavator controls the actuator speed by regulating displacement vol. of hydraulic pumps in accordance with given priority order. A judging circuit decides the order of priority of hydraulic connection between a first actuator(4) and the first and second hydraulic pumps(1,10) which are variable displacement vol. types, and between the second pump(10) and the first and second actuators(4,40). A max. tilting sensing circuit indicates when the swash plate tilting, and therefore the displacement volume, of the first pump is maximized. A further sensing circuit indicates when the displacement vol. of the second pump is zero.

3. 发明授权

KR850001835B1 유압 구동장치의 제어방법 및 제어장치 失效
公开(公告)号：KR850001835B1
公开(公告)日：1985-12-26
申请号：KR810003915
申请日：1981-10-16
申请人： HITACHI CONSTRUCTION MACHINERY
发明人： IZUMI EIKI , AOYAKI YUKIO , NAKAJIMA KICHIO , WATANABE HIROSHI , HONMA KAZUO
IPC分类号： F16H61/40 , F16H61/4008 , F16H61/433 , F16H39/46

4. 发明授权

KR870000168B1 액압동력계의 제어장치 失效
公开(公告)号：KR870000168B1
公开(公告)日：1987-02-13
申请号：KR810003829
申请日：1981-10-08
申请人： HITACHI CONSTRUCTION MACHINERY
发明人： IZUMI EIKI , WADANABE HIROSHI , AOYAKI YUKIO , HONMA GAZUO , NAKAJIMA GICHIO
IPC分类号： F02D29/04 , B60W10/06 , B60W10/10 , B60W30/18 , E02F9/22 , F02D41/38 , F04B49/00 , F16H61/42 , F16H61/46 , F16H61/465

5. 发明授权

KR860001715B1 CONTROL SYSTEM FOR HYDRAULIC CIRCUIT APPARATUS 失效
公开(公告)号：KR860001715B1
公开(公告)日：1986-10-18
申请号：KR820004441
申请日：1982-09-30
申请人： HITACHI CONSTRUCTION MACHINERY
发明人： WATANABE HIROSHI , IZUMI EIKI , NAKAJIMA KICHIO , HONMA KAZUO , AOYAKI YUKIO
IPC分类号： B66C13/18 , E02F9/20 , E02F9/22 , F15B11/16 , F15B11/17 , F15B21/08
摘要： In an excavator, a first pump drives an arm cylinder, three pumps drive the boom cylinder, and the third pump drives the bucket cylinder. On-off valves control the connection between the first pump and the arm cylinder. A judging circuit determines whether or not the first pump is in hydraulic connection with the boom cylinder when the operation sygnal for the arm cylinder is received. The arm cylinder then takes precedence over the boom cylinder for hydraulic connection with the first pump, and the boom cylinder is brought into hydraulic connection with the second pump.

6. 发明授权

KR860000755B1 CONTROL SYSTEM OF HYDRAULIC CIRCUIT APPARATUS 失效
公开(公告)号：KR860000755B1
公开(公告)日：1986-06-18
申请号：KR820001349
申请日：1982-03-29
申请人： HITACHI CONSTRUCTION MACHINERY
发明人： WATANABE HIROSHI , AOYAKI YUKIO , NAKAZIMA KICHIO , IZUMI EIKI , HONMA KATSUO
IPC分类号： F04B49/06 , F15B9/04 , F15B21/08 , G05D3/14
摘要： A control system for hydraulic pump includes two maximum speed- setting cirucits selected according to the direction of motion of the variable displacement actuator. The pump(4) includes a swash plate(8) of which the angle is adjusted by a driver(10) to vary the pump displacement volume. The operating speed of the actuator(6) depends on the swash plate position. The position is determined by the control lever(14) and by the motion of actuator. Two maximum speeds of pump are determined in a circuit(24) and a second maximum speed generating circuit(26) switch(28) responsive to two comparators(30,32).

7. 发明专利

DE69004789T3 未知
公开(公告)号：DE69004789T3
公开(公告)日：1997-12-18
申请号：DE69004789
申请日：1990-01-18
申请人： HITACHI CONSTRUCTION MACHINERY
发明人： TATSUMI AKIRA , HIRATA TOICHI , HAGA MASAKAZU - , IZUMI EIKI
IPC分类号： E02F9/22 , F15B11/00
摘要： 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.

8. 发明专利

DE69112375T2 未知
公开(公告)号：DE69112375T2
公开(公告)日：1996-03-07
申请号：DE69112375
申请日：1991-09-27
申请人： HITACHI CONSTRUCTION MACHINERY
发明人： WATANABE HIROSHI , TANAKA YASUO , IZUMI EIKI , ONOUE HIROSHI , NAKAMURA SHIGETAKA
IPC分类号： E02F9/22 , F04B49/06 , F15B11/00 , F15B11/05 , F15B11/08 , F15B11/16 , F15B21/08 , F04B49/00
摘要： A control system of a hydraulic pump (1) in a load sensing control hydraulic drive circuit, comprising: a first means (202) in which a target pressure difference between the discharge pressure of the hydraulic pump and the load pressure of an actuator (2) is set a variable value; second means (203, 210-213) for determining a controlling coefficient which increases with an increase in deviation of this target pressure difference as a variable value from an actual pressure difference, decreases with a decrease thereof and increases for a relatively small deviation of the pressure difference when the target pressure difference is small; and third means (205, 206) for determining the target displacement volume from the deviation of the pressure difference and the controlling coefficient; whereby, irrespective of a value of the target pressure difference, stabilized control of the hydraulic pump can be performed, without causing hunting when the operating speed of a control lever (3a) is low, and, when the operating speed of the control lever is high, the control of the hydraulic pump with prompt and quick responses can be performed.

9. 发明专利

DE69108787D1 未知
公开(公告)号：DE69108787D1
公开(公告)日：1995-05-18
申请号：DE69108787
申请日：1991-06-19
申请人： HITACHI CONSTRUCTION MACHINERY
发明人： IZUMI EIKI , WATANABE HIROSHI
IPC分类号： E02F9/22 , F04B49/00 , F15B11/00 , F15B11/16 , F15B11/05 , F15B21/08
摘要： A control system for a load sensing hydraulic drive circuit comprises a variable displacement pump (1), at least one hydraulic actuator (2), a flow control valve (3) connected between the hydraulic pump and the actuator, a pump controller (8) for controlling a delivery rate of the hydraulic pump such that a delivery pressure of the hydraulic pump is higher by a first predetermined value DELTA Po than a load pressure of the actuator, and an unloading valve (20) connected between the hydraulic pump and the actuator for holding a differential pressure between the delivery pressure of the hydraulic pump and the load pressure of the actuator less than a second predetermined value DELTA Puo. The control system further comprises a detector (5) for detecting a value associated with a demanded flow rate of the flow control valve, and a control unit (7) for controlling the unloading valve (20) based on the detector output and in view of the predetermined values.

10. 发明专利

IN173279B Hydraulic drive traveling system 未知
公开(公告)号：IN173279B
公开(公告)日：1994-03-26
申请号：IN275CA1990
申请日：1990-04-03
申请人： HITACHI CONSTRUCTION MACHINERY
发明人： TANAKA HIDEAKI , HIRATA TOICHI , SUGIYAMA GENROKU , KAGIWADA HITOSHI , YASUOKA TOMOHIKO , WATANABE HIROSHI , IZUMI EIKI , ONOUE HIROSHI
IPC分类号： F15B15/18

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