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1. 发明授权

US5155996A Hydraulic drive system for construction machine 失效
公开(公告)号：US5155996A
公开(公告)日：1992-10-20
申请号：US566466
申请日：1990-08-20
申请人： Akira Tatsumi , Toichi Hirata , Masakazu Haga , Eiki Izumi
发明人： Akira Tatsumi , Toichi Hirata , Masakazu Haga , Eiki Izumi
IPC分类号： E02F9/22
CPC分类号： F16H61/4078 , E02F9/2235 , E02F9/2246 , E02F9/2296 , F16H61/433 , B60W10/06 , F15B2211/20553 , F15B2211/253 , F15B2211/50536 , F16H2059/6846
摘要： A hydraulic drive system for a construction machine comprising a prime mover (1), a hydraulic pump (2) of variable displacement type driven by the prime mover, at least one hydraulic actuator (6) driven by a hydraulic fluid delivered from the hydraulic pump, control valves connected between the hydraulic pump and the actuator for controlling a flow rate of the hydraulic fluid supplied to the actuator dependent on the operation amount of control apparatus, pump control apparatus for controlling a displacement volume of the hydraulic pump dependent on the operation amount of the control apparatus such that the delivery rate of the hydraulic pump is increased with an increase in the operation amount, and prime mover control apparatus (29) for controlling a revolution speed of the prime mover. The prime mover control apparatus (29) has a function (33, 36) to monitor saturation of the delivery rate of the hydraulic pump (2), and to raise up the revolution speed of the prime mover (1) to prevent the pump from the saturation when the hydraulic pump reaches a predetermined state concerned with the saturation.

2. 发明授权

US5177964A Hydraulic drive traveling system 失效
标题翻译：液压驱动行驶系统
公开(公告)号：US5177964A
公开(公告)日：1993-01-12
申请号：US499418
申请日：1990-06-25
申请人： Hideaki Tanaka , Toichi Hirata , Genroku Sugiyama , Hitoshi Kagiwada , Tomohiko Yasuoka , Hiroshi Watanabe , Eiki Izumi , Hiroshi Onoue
发明人： Hideaki Tanaka , Toichi Hirata , Genroku Sugiyama , Hitoshi Kagiwada , Tomohiko Yasuoka , Hiroshi Watanabe , Eiki Izumi , Hiroshi Onoue
IPC分类号： E02F9/22 , F16H61/40 , F16H61/4069 , F16H61/4148 , F16H61/42 , F16H61/421 , F16H61/425 , F16H61/435 , F16H61/46 , F16H61/47
CPC分类号： E02F9/2235 , E02F9/2253 , E02F9/2296 , F16H61/4069 , F16H61/4148 , F16H61/421 , F16H61/425 , F16H61/435 , F16H61/46 , F16H61/47
摘要： A hydraulic drive traveling system has a pressure compensated low control valve connected between a hydraulic pump and a variable displacement type hydraulic motor for controlling a flow rate of the hydraulic fluid supplied to the motor. The flow rate is controlled in accordance with the delivery pressure of the pump and demanded traveling speed of the motor. When the delivery pressure of the pump is at a high level, the motor is shifted to a first capacity. When the delivery pressure of the pump is low, the motor is shifted to either the second capacity or the first capacity depending upon the demanded traveling speed.
摘要翻译： PCT No.PCT / JP90 / 00097 Sec。 371日期：1990年6月25日 102（e）1990年6月25日PCT 1990年1月26日PCT PCT。公开号WO90 / 08910 1990年9月8日。液压驱动行驶系统具有连接在液压泵和可变排量型液压马达之间的压力补偿低控制阀，用于控制供给马达的液压流体的流量。流量根据泵的输送压力进行控制，并要求电机的行进速度。当泵的输送压力处于高水平时，电动机转移到第一容量。当泵的输送压力低时，电动机根据需要的行驶速度而转移到第二容量或第一容量。

3. 发明授权

US4967557A Control system for load-sensing hydraulic drive circuit 失效
标题翻译：负载传感液压驱动电路控制系统
公开(公告)号：US4967557A
公开(公告)日：1990-11-06
申请号：US301718
申请日：1989-01-26
申请人： Eiki Izumi , Yasuo Tanaka , Hiroshi Watanabe , Kuniaki Yoshida , Toichi Hirata
发明人： Eiki Izumi , Yasuo Tanaka , Hiroshi Watanabe , Kuniaki Yoshida , Toichi Hirata
IPC分类号： F15B11/00 , E02F9/20 , E02F9/22 , F02D29/04 , F15B11/05 , F15B11/16 , F15B21/08
CPC分类号： E02F9/2025 , E02F9/2228 , E02F9/2235 , E02F9/2246 , E02F9/2292 , E02F9/2296 , F02D29/04 , F15B11/165 , F15B21/087 , F15B2211/20553 , F15B2211/255 , F15B2211/30505 , F15B2211/30535 , F15B2211/3111 , F15B2211/31576 , F15B2211/329 , F15B2211/6054 , F15B2211/6309 , F15B2211/6313 , F15B2211/633 , F15B2211/6333 , F15B2211/634 , F15B2211/6346 , F15B2211/6355 , F15B2211/7053 , F15B2211/71
摘要： Control system for a load-sensing hydraulic drive circuit comprising; at least one hydraulic pump; hydraulic actuators driven by the hydraulic pump; and a pressure compensated flow control valve between the pump and each of the actuators, for controlling a flow rate of fluid to each actuator in response to a control signal. The control system has first detection means for detecting a differential pressure between the pump delivery pressure and the maximum load pressure; second detection means for detecting the pump delivery pressure; first means for calculating a differential pressure target pump delivery amount Q.DELTA.p to hold the differential pressure constant; second means for calculating an input limiting target pump delivery amount QT based on at least a pressure signal from the second detection means and an input limiting pump function; third means for selecting one of the differential pressure target delivery amount Q.DELTA.p and the input limiting target delivery amount QT as a pump delivery amount target value Qo, and then controlling the pump delivery amount to not exceed the input amount QT; and fourth means for calculating a compensation value Qns to limit a total consumable actuator flow rate based on at least the input amount QT and the differential pressure target delivery amount Q.DELTA.p when the input amount QT is selected by the third means, and then controlling the pressure compensated flow control valve based on the compensation valve Qns.

4. 发明授权

US5056312A Hydraulic drive system for construction machines 失效
标题翻译：液压驱动系统
公开(公告)号：US5056312A
公开(公告)日：1991-10-15
申请号：US449845
申请日：1989-11-22
申请人： Toichi Hirata , Genroku Sugiyama , Yusuke Kajita , Yukio Aoyagi , Tomohiko Yasudi , Gen Yasuda , Hiroshi Watanabe , Eiki Izumi , Yasuo Tanaka , Hiroshi Onoue , Shigetaka Nakamura
发明人： Toichi Hirata , Genroku Sugiyama , Yusuke Kajita , Yukio Aoyagi , Tomohiko Yasudi , Gen Yasuda , Hiroshi Watanabe , Eiki Izumi , Yasuo Tanaka , Hiroshi Onoue , Shigetaka Nakamura
IPC分类号： E02F9/22 , F15B11/16 , F15B21/08
CPC分类号： F15B21/087 , E02F9/2228 , E02F9/2235 , E02F9/2285 , E02F9/2292 , E02F9/2296 , F15B11/163 , F04B2205/05 , F04B2207/01 , F15B2211/20553 , F15B2211/25 , F15B2211/30535 , F15B2211/3111 , F15B2211/40515 , F15B2211/40569 , F15B2211/428 , F15B2211/455 , F15B2211/6052 , F15B2211/6309 , F15B2211/6313 , F15B2211/6355 , F15B2211/65 , F15B2211/6653 , F15B2211/6654 , F15B2211/71 , F15B2211/78
摘要： A hydraulic system for a construction machine comprising plural hydraulic actuators (23-28) driven by fluid supplied from a pump (22), first and second flow control valves (29-34) for controlling flows of fluid supplied to the first and second actuators, and first and second distribution compensating valves (35-40) for controlling first differential pressure (.DELTA.P v1-.DELTA.P v6) produced between inlets and outlets of the first and second flow control valves. The first and second distribution compensating valves have respective drives (45-50, 35c-40c) for applying control forces (Fc1-Fc2) in accordance with the second differential pressure to the associated distribution compensating valves, to thereby set target values of the first differential pressures. The hydraulic system includes first means (59) for detecting the second differential pressure (.DELTA.P LS) from the discharge pressure (P s) of the pump (22) and the maximum load pressure (P amax) out of the first and second actuators; second means (61) for calculating individual values (Fc1-Fc6), as values of the control forces applied from the drives (45-50, 35C-40C) of the first and second distribution compensating valves (35-40), in accordance with at least the second differential pressure detected by the first means; and first and second control pressure generators (62a-62f) provided in association with the first and second distribution compensating valves. The first and second control pressure generators (62a-62f) produce control pressures (P c1-P c6) dependent on the individual values obtained by the second means and output the control pressures to the drives (35c-40c) of the first and second distribution compensating valves.

5. 发明授权

US4945723A Flow control valves for hydraulic motor system 失效
公开(公告)号：US4945723A
公开(公告)日：1990-08-07
申请号：US213179
申请日：1988-06-29
申请人： Eiki Izumi , Toichi Hirata , Yusaku Nozawa , Masahiko Shimotori
发明人： Eiki Izumi , Toichi Hirata , Yusaku Nozawa , Masahiko Shimotori
IPC分类号： E02F9/22 , F15B11/16 , F15B11/20 , F15B13/04 , F15B13/06
CPC分类号： F15B13/0405 , E02F9/2225 , E02F9/2232 , Y10T137/87193
摘要： A hydraulic drive system has first and second flow control valves. Each of the control valves has a main valve of the seat valve type with a valve body for controlling communication between an inlet port and an outlet port which are both connected to a main circuit. Each further have a variable restrictor capable of changing an opening degree thereof in response to displacements of the valve body, and a back pressure chamber communcating with the inlet port through the variable restrictor and producing a control pressure to urge the valve body in the valve-closing direction. A pilot valve is connected to a pilot circuit which is connected between the back pressure chamber and the outlet port of the main valve; and an auxiliary valve is connected to the pilot circuit for controlling a differential pressure between the inlet pressure and the outlet pressure of the pilot valve. The auxiliary valve is controlled such that the differential pressure between the inlet pressure and the outlet pressure of the pilot valve has a relationship expressed by a certain equation including constants .alpha., .beta. and .gamma., with respect to a differential pressure between the delivery pressure of a hydraulic pump and the maximum load pressure of the first and second hydraulic actuators, a differential pressure between that maximum load pressure and the self-load pressure of each of the hydraulic actuators, and the self-load pressure, wherein the constants .alpha., .beta. and .gamma. are set to respective predetermined values.

6. 发明授权

US4561249A Control system for hydraulic circuit apparatus 失效
公开(公告)号：US4561249A
公开(公告)日：1985-12-31
申请号：US426096
申请日：1982-09-28
申请人： Hiroshi Watanabe , Eiki Izumi , Yukio Aoyagi , Kazuo Honma , Kichio Nakajima
发明人： Hiroshi Watanabe , Eiki Izumi , Yukio Aoyagi , Kazuo Honma , Kichio Nakajima
IPC分类号： B66C13/18 , E02F9/20 , E02F9/22 , F15B11/16 , F15B11/17 , F15B21/08 , F16H39/46
CPC分类号： E02F9/2242 , B66C13/18 , E02F9/2025 , E02F9/2221 , E02F9/2292 , E02F9/2296 , F15B11/17 , F15B21/087 , F15B2211/20546 , F15B2211/20561 , F15B2211/27 , F15B2211/30515 , F15B2211/30595 , F15B2211/327 , F15B2211/6333 , F15B2211/6652 , F15B2211/6654 , F15B2211/71
摘要： A control system for a hydraulic circuit having at least first and second hydraulic pumps of the variable displacement type, a first hydraulic actuator arranged for hydraulic connection with the first pump through first valve to be driven thereby, and a second hydraulic actuator arranged for selective hydraulic connection with said first and second pumps through second and third valve respectively to be driven thereby. The order of priority for hydraulic connection is preset so that, when an operation signal for the second actuator is received while the first pump is inoperative, the first pump takes priority over the second pump, and when an operation signal for the first actuator is received while the first pump is in hydraulic connection with the second actuator, the first actuator takes priority over the second actuator and the second actuator is brought into hydraulic connection with the second pump, and the displacement volume of the first pump and switching of the second valve means are controlled such that, when the first pump which is, in hydraulic connection with the second actuator, is to be brought into hydraulic connection with the first actuator, the displacement volume of the first pump is returned to zero before changing of the hydraulic connection. The control system includes a first judging device for determining if the first pump is in hydraulic connection with the second actuator when the operation signal for the first actuator is received, and for generating a command for backing up reduction in the supply of hydraulic fluid into the second actuator simultaneously when the displacement volume of the first pump begins to returns to zero. When judged that the first pump is in hydraulic connection with the second actuator, a command signal switches a third valve to an open position in accordance with the backup command. A command for initiating a displacement of the second pump is generated in accordance with the backup command.

7. 发明授权

US4558593A Failure detection system for hydraulic pumps 失效
标题翻译：液压泵故障检测系统
公开(公告)号：US4558593A
公开(公告)日：1985-12-17
申请号：US634560
申请日：1984-07-26
申请人： Hiroshi Watanabe , Eiki Izumi
发明人： Hiroshi Watanabe , Eiki Izumi
IPC分类号： E02F9/22 , F04B1/26 , F04B49/06 , G01M19/00
CPC分类号： F04B1/26 , E02F9/2235 , E02F9/226 , F04B49/065
摘要： A failure detection system for hydraulic pumps each having displacement varying means. The system includes displacement command generating means for generating a command value for causing the displacement varying means of one of the pumps to be displaced a predetermined amount, sensor means for sensing the amount of a displacement of the displacement varying means, comparator means for comparing the absolute value of the difference between a command value generated by the displacement command generating means and the amount of the displacement sensed by the sensor means with a predetermined allowable value, and output means for outputting a failure signal for indicating that the pump is out of order when it is found by the comparator means that the allowable value has been exceeded by the absolute value.
摘要翻译：一种液压泵的故障检测系统，每个都具有位移变化装置。该系统包括位移指令产生装置，用于产生用于使一个泵的位移变化装置移动预定量的指令值，用于感测位移变化装置的位移量的传感器装置，用于比较由位移指令发生装置产生的指令值与传感器装置感测到的位移量之间的差异的绝对值为预定的允许值;以及输出装置，用于输出用于指示泵故障的故障信号当比较器发现允许值超过绝对值时。

8. 发明授权

US4531369A Flushing valve system in closed circuit hydrostatic power transmission 失效
标题翻译：冲洗阀系统在闭路静液压传动
公开(公告)号：US4531369A
公开(公告)日：1985-07-30
申请号：US351756
申请日：1982-02-24
申请人： Eiki Izumi , Hiroshi Watanabe , Yukio Aoyagi , Kazuo Honma , Kichio Nakajima
发明人： Eiki Izumi , Hiroshi Watanabe , Yukio Aoyagi , Kazuo Honma , Kichio Nakajima
IPC分类号： F15B11/08 , F16H39/02 , F16H61/40 , F16H61/4008 , F16H61/4104 , F16H61/4139 , F16D31/02
CPC分类号： F16H61/40 , F16H39/02 , F16H61/4104
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.
摘要翻译：一种适用于闭路静液压变速器的冲洗阀系统，包括可变排量液压泵，液压执行器和两条主线。冲洗阀系统包括安装在通道中的提升阀，用于分别将主管线与流体箱连通，通道安装节流阀，用于使主管线中的压力作用在压力室上，以使提升阀的弹簧保持不动地移动到打开位置以及响应于主管之间的压力差的换向阀，将连接到下压侧的主管的提升阀的压力室与流体箱连通。当主管中的压力超过预定压力水平时，连接到下压侧的主管的提升阀开启，从而允许主管线中的工作流体排出到流体箱。

9. 发明授权

US4510750A Circuit pressure control system for hydrostatic power transmission 失效
标题翻译：静压力传动电路压力控制系统
公开(公告)号：US4510750A
公开(公告)日：1985-04-16
申请号：US270569
申请日：1981-06-04
申请人： Eiki Izumi , Hiroshi Watanabe , Yukio Aoyagi , Kazuo Honma , Kichio Nakajima
发明人： Eiki Izumi , Hiroshi Watanabe , Yukio Aoyagi , Kazuo Honma , Kichio Nakajima
IPC分类号： F16H61/42 , F16H61/433 , F16H61/46 , F16D33/02
CPC分类号： F16H61/433 , F16H2059/683 , F16H2059/6853 , F16H2059/6861
摘要： A circuit pressure control system for a hydrostatic power transmission having a variable-displacement hydraulic pump driven by a prime mover, a hydraulic actuator for actuating a load and a displacement adjusting mechanism for the hydraulic pump. The hydraulic pump and actuator are connected together in closed or semi-closed circuit, and the displacement adjusting mechanism is actuated by a signal indicative of the operating lever manipulated variable and a signal indicative of the actual displacement of the hydraulic pump to control the speed of the hydraulic actuator. The circuit pressure control system is provided with a sensor for sensing the circuit pressure of the hydrostatic power transmission and generating a signal indicative of the sensed circuit pressure, a device for calculating based on the manipulated variable and circuit pressure signal a hydraulic pump displacement command that causes the displacement of the hydraulic pump to be changed at a maximum rate when the circuit pressure is below a predetermined value and causes the changing rate of the displacement to be reduced when the predetermined value is exceeded thereby, and a device for comparing the displacement command with the actual displacement of the hydraulic pump and producing a signal for decreasing the difference between them and supplying such signal to the displacement adjusting mechanism.
摘要翻译：一种用于具有由原动机驱动的可变排量液压泵的液压动力传动的回路压力控制系统，用于致动负载的液压致动器和用于液压泵的位移调节机构。液压泵和致动器在闭合或半闭合的电路中连接在一起，位移调节机构由表示操作杆操纵变量的信号和表示液压泵的实际位移的信号致动以控制液压泵的速度液压执行器。电路压力控制系统设置有用于感测静液压力传递的电路压力并产生指示感测电路压力的信号的传感器，用于基于操作变量和电路压力信号计算的装置，液压泵排量指令，导致当电路压力低于预定值时液压泵的位移以最大速率变化，并且当超过预定值时使位移的变化率减小，并且用于比较位移指令与液压泵的实际位移产生用于减小它们之间的差异并将信号提供给位移调节机构的信号。

10. 发明授权

US4369625A Drive system for construction machinery and method of controlling hydraulic circuit means thereof 失效
标题翻译：工程机械用驱动系统及其液压回路装置的控制方法
公开(公告)号：US4369625A
公开(公告)日：1983-01-25
申请号：US123087
申请日：1980-02-20
申请人： Eiki Izumi , Kazuo Honma , Katsuro Abe , Masaaki Uno , Kichio Nakajima
发明人： Eiki Izumi , Kazuo Honma , Katsuro Abe , Masaaki Uno , Kichio Nakajima
IPC分类号： E02F9/22 , F16H39/46
CPC分类号： E02F9/2242 , E02F9/2292
摘要： A drive system for construction machinery in which hydraulic circuit is provided with a plurality of variable-displacement hydraulic pumps and a plurality of hydraulic actuators, each pump being connected in closed circuit to one or a plurality of the actuators via a solenoid-operated valve or valves to drive a movable member or members connected to the actuator or respective actuators when pressurized fluid is supplied to the actuator or actuators from the pump. At least one of the selected hydraulic actuators is further connected in closed circuit through a solenoid-operated valve to at least one of the hydraulic pumps other than the hydraulic pump which is connected in closed circuit to the hydraulic actuator. The hydraulic circuit means is controlled such that timing for switching the solenoid-operated valves is controlled in conjunction with the operation of the pump so as to absorb the shock which would otherwise be produced when each actuator is rendered operative and inoperative. The hydraulic circuit means is further controlled such that, when the operation speed of each hydraulic actuator is increased or reduced including the time at which the actuator is rendered operative and inoperative, the speed is adjusted in conformity with the inertia and operation characteristics of a movable member connected to the actuator.
摘要翻译：一种用于工程机械的驱动系统，其中液压回路设置有多个可变排量液压泵和多个液压致动器，每个泵通过电磁阀或闭合回路连接到一个或多个致动器，当加压流体从泵被供应到致动器或致动器时，驱动可移动构件或连接到致动器或各个致动器的构件的阀。所选择的液压致动器中的至少一个通过电磁阀进一步连接到闭合回路中的至少一个液压泵以外的液压泵中，所述液压泵与液压致动器的闭路连接。控制液压回路装置，以便结合泵的操作来控制电磁阀切换的定时，以便吸收当每个致动器操作和不起作用时否则会产生的冲击。液压回路装置被进一步控制，使得当每个液压致动器的操作速度增加或减小，包括致动器操作和不起作用的时间时，速度根据可动件的惯性和操作特性进行调节连接到执行器的构件。

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