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1. 发明授权

KR850000749B1 유압 전동장치에 있어서의 회로 압력제어장치 失效
公开(公告)号：KR850000749B1
公开(公告)日：1985-05-24
申请号：KR810001996
申请日：1981-06-03
申请人： HITACHI CONSTRUCTION MACHINERY
发明人： IJUMI EIKI , AOYAKI YUKIO , NAKAJIMA KICHIO , WATANABE HIROSI , HONMA KAZUO
IPC分类号： F16H61/42 , F16H61/433 , F16H61/46 , F16H39/44

2. 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.

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

KR850000750B1 유압구동 장치의 제어 장치 失效
公开(公告)号：KR850000750B1
公开(公告)日：1985-05-24
申请号：KR810002841
申请日：1981-08-05
申请人： HITACHI CONSTRUCTION MACHINERY
发明人： IJUMI EIKI , AOYAKI YUKIO , NAKAJIMA KICHIO , WATANABE HIROSI , HONMA KAZUO
IPC分类号： G05D16/00 , F16H61/40 , F16H61/431 , F16H39/44

5. 发明专利

DE3271304D1 FLUSHING VALVE SYSTEM IN CLOSED CIRCUIT HYDROSTATIC POWER TRANSMISSION 未知
公开(公告)号：DE3271304D1
公开(公告)日：1986-07-03
申请号：DE3271304
申请日：1982-02-22
申请人： HITACHI CONSTRUCTION MACHINERY
发明人： IZUMI EIKI , WATANABE HIROSHI , AOYAGI YUKIO , HONMA KAZUO , NAKAJIMA KICHIO -
IPC分类号： F15B11/08 , F16H39/02 , F16H61/40 , F16H61/4008 , F16H61/4104 , F16H61/4139
摘要： A flushing valve system suitable for use in a closed circuit hydrostatic transmission including a variable displacement hydraulic pump, a hydraulic actuator and two main lines. The flushing valve system includes poppet valves mounted in passages for respectively communicating the main lines with a fluid tank, passages mounting throttles for causing the pressure in the main lines to act on pressure chambers to keep poppets of the poppet valves from moving to an open position, and a change-over valve responsive to the pressure differential between the main lines to communicate the pressure chamber of the poppet valve connected to the main line on the lower pressure side with the fluid tank. The poppet valve connected to the main line on the lower pressure side opens when a predetermined pressure level is exceeded by the pressure in the main line, to thereby allow working fluid in the main line to be drained to the fluid tank.

6. 发明专利

DE3266290D1 CONTROL SYSTEM FOR HYDRAULIC CIRCUIT MEANS INCLUDING A VARIABLE DISPLACEMENT PUMP AND ACTUATOR MEANS 未知
公开(公告)号：DE3266290D1
公开(公告)日：1985-10-24
申请号：DE3266290
申请日：1982-03-29
申请人： HITACHI CONSTRUCTION MACHINERY
发明人： WATANABE HIROSHI , IZUMI EIKI , AOYAGI YUKIO , HONMA KAZUO , NAKAJIMA KICHIO HITACHITSUKUBA
IPC分类号： F04B49/06 , F15B9/04 , F15B21/08 , G05D3/14
摘要： A control system (12, 70, 130, 160) for hydraulic circuit means (2, 64) having a variable displacement hydraulic pump (4, 60), and actuator means (6) driven by the pump, in which pump control means (22, 74, 164) controls a displacement volume varying member (8, 66) of the pump based on an operating signal (XL) giving a command with respect to the position thereof and a detector signal (YL) indicative of the actual position thereof while restricting the operating speed of the member to a level below a predetermined maximum speed. The control system has maximum speed setting means (20, 72, 132, 162) previously setting a first predetermined maximum speed ( alpha 1) and a second predetermined maximum speed ( alpha 2, alpha 3) higher than the first predetermined maximum speed for the operating speed of the variable displacement volume varying member (8, 66) and operative to select the first predetermined maximum speed ( alpha 1) when the direction of operation of the actuator means (6) commanded by the operating signal agrees with the actual direction of operation thereof, and select the second predetermined maximum speed ( alpha 2, alpha 3) when the position of the displacement volume varying member commanded by the operating signal is neutral or when the direction of operation of the actuator means commanded by the operating signal is opposite to the actual direction of operation thereof. The pump control means is constructed to effect the speed control of the displacement volume varying member based on the first or second predetermined maximum speed selected by the maximum speed setting means.

7. 发明专利

DE3660226D1 CONTROL SYSTEM FOR HYDRAULIC CIRCUIT 未知
公开(公告)号：DE3660226D1
公开(公告)日：1988-06-30
申请号：DE3660226
申请日：1986-02-03
申请人： HITACHI CONSTRUCTION MACHINERY
发明人： NAKAJIMA KICHIO TSUKUBA HOUSE , HONMA KAZUO , TOKAIRIN HIROAKI
IPC分类号： E02F9/22 , F15B21/08 , F15B13/01

8. 发明专利

DE3176721D1 CONTROL METHOD AND CONTROL SYSTEM FOR HYDROSTATIC DRIVE SYSTEM 未知
公开(公告)号：DE3176721D1
公开(公告)日：1988-06-01
申请号：DE3176721
申请日：1981-10-15
申请人： HITACHI CONSTRUCTION MACHINERY
发明人： IZUMI EIKI , WATANABE HIROSHI , AOYAGI YUKIO , HONMA KAZUO , NAKAJIMA KICHIO -
IPC分类号： F16H61/40 , F16H61/4008 , F16H61/433 , F16H39/50
摘要： A control method and a control system for a hydrostatic drive system including a variable displacement hydraulic pump (2) and a hydraulic actuator (3) connected together to form a closed hydraulic fluid circuit. When the flow rate of the hydraulic pump is increased, the rate of change in the tilt of the hydraulic pump (2) is controlled so that the discharge pressure does not exceed a first set of values set beforehand with respect to the flow rate of the pump, meanwhile when the flow rate of the pump is reduced,-the rate of change in the tilt of the hydraulic pump (2) is controlled so that the suction pressure does not exceed a second set of values set beforehand with respect to the flow rate of the pump.

9. 发明专利

DE3272226D1 HYDRAULIC DRIVE SYSTEM FOR SINGLE ROD CYLINDER 未知
公开(公告)号：DE3272226D1
公开(公告)日：1986-09-04
申请号：DE3272226
申请日：1982-01-04
申请人： HITACHI CONSTRUCTION MACHINERY
发明人： NAKAJIMA KICHIO HITACHI-TSUKUB , IZUMI EIKI , WATANABE HIROSHI , AOYAGI YUKIO , HONMA KAZUO
IPC分类号： F15B11/00 , F15B7/10 , F15B11/08 , F16K11/07 , F15B15/17
摘要： A hydraulic drive system including a main line, a variable displacement hydraulic pump and another main line connected to a single rod cylinder in a closed hydraulic circuit, and a flushing valve having a first switching position in which one main line is communicated with a low pressure line and a second switching position in which the other main line is communicated with the low pressure line. The flushing valve is operative to maintain at least one of the two main lines in communication with the low pressure line at all times while moving from one switching position to the other switching position, to keep a lock-up phenomenon from taking place in the closed hydraulic circuit. The system further includes a pressure generating device for generating between the two main lines a pressure differential necessary for effecting switching of the flushing valve.

10. 发明专利

DE3268852D1 CONTROL SYSTEM FOR HYDRAULIC CIRCUIT APPARATUS 未知
公开(公告)号：DE3268852D1
公开(公告)日：1986-03-13
申请号：DE3268852
申请日：1982-10-01
申请人： HITACHI CONSTRUCTION MACHINERY
发明人： WATANABE HIROSHI , IZUMI EIKI , AOYAGI YUKIO , HONMA KAZUO , NAKAJIMA KICHIO
IPC分类号： B66C13/18 , E02F9/20 , E02F9/22 , F15B11/16 , F15B11/17 , F15B21/08
摘要： A hydraulic circuit comprises at least first and second hydraulic pumps (10,12) of the variable displacement type, a first hydraulic actuator (20) arranged for hydraulic connection with the first pump (10) through first valve means (50a) to be driven thereby, and a second hydraulic actuator (21) arranged for selective hydraulic connection with said first and second pumps (10, 12) through second and third valve means (50b, 52b) respectively to be driven thereby. In the control system, the order of priority for hydraulic connection is set beforehand in such a manner that when an operation signal (61) for the second actuator (21) is received while the first pump (10) is inoperative, pump (10) takes priority over the second pump (12) for hydraulic connection with the second actuator (21), and when an operation signal (60) for the first actuator (20) is received while the first pump (10) is in hydraulic connection with the second actuator (21), the first actuator (20) takes priority over the second actuator (21) for hydraulic connection with the first pump (10) and the second actuator (21) is brought into hydraulic connection with the second pump (12), and the displacement volume of the first pump (10) and switching of the second valve means (50b) are controlled in such a manner that when the first pump (10) which is in hydraulic connection with the second actuator (21) is to be brought into hydraulic connection with the first actuator (20) the displacement volume of the first pump (10) is once returned to zero before changing of the hydraulic connection. The control system has first means (76) for judging whether or not the first pump (10) is in hydraulic connection with the second actuator (21) when the operation signal for the first actuator (20) is received, and generating a command for backing up reduction in the inflow of hydraulic fluid into the second actuator (21) simultaneously when the displacement volume of the first pump (10) begins to be returned to zero, when it is judged that the first pump (10) is in hydraulic connection with the second actuator (21), second means (72) for generating a command for switching the third valve means (52b) to an open position in accordance with the backup command from the first means (76) and third means (74) for generating a command for initiating a displacement of the second pump (12) in accordance with the backup command from the first means (76).

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