A working machine control system includes: a split-flow fluid pressure pump configured to discharge a working fluid from a first discharge port and a second discharge port; a communication switching valve configured to allow, when one of a first operation valve and a second operation valve is switch
A working machine control system includes: a split-flow fluid pressure pump configured to discharge a working fluid from a first discharge port and a second discharge port; a communication switching valve configured to allow, when one of a first operation valve and a second operation valve is switched, the first discharge port or the second discharge port for one of the first operation valve and the second operation valve that is not switched to communicate with a first neutral passage or a second neutral passage for the other of the first operation valve and the second operation valve that is switched; and a discharge flow rate adjusting device configured to adjust the fluid pressure pump so as to reduce a discharge flow rate of the fluid pressure pump in a case where a switch signal is inputted from any one of the first operation valve and the second operation valve.
대표청구항▼
1. A working machine control system configured to control a working machine including a first actuator and a second actuator, the working machine control system comprising: a split-flow fluid pressure pump configured to discharge a working fluid from a first discharge port and a second discharge por
1. A working machine control system configured to control a working machine including a first actuator and a second actuator, the working machine control system comprising: a split-flow fluid pressure pump configured to discharge a working fluid from a first discharge port and a second discharge port;a first circuit system to which the working fluid discharged from the first discharge port is supplied, the first circuit system including a first operation valve and a first neutral passage, the first operation valve being configured to control the first actuator, the first neutral passage allowing the first discharge port to communicate with a tank in a state where the first operation valve is placed at a normal position;a second circuit system to which the working fluid discharged from the second discharge port is supplied, the second circuit system including a second operation valve and a second neutral passage, the second operation valve being configured to control the second actuator, the second neutral passage allowing the second discharge port to communicate with the tank in a state where the second operation valve is placed at a normal position;a communication switching valve configured to be switched between a first condition and a second condition, in the first condition, the communication switching valve allowing the first discharge port to communicate with the second neutral passage,in the second condition, the communication switching valve allowing the second discharge port to communicate with the first neutral passage; anda discharge flow rate adjusting device configured to adjust the fluid pressure pump so as to reduce a discharge flow rate of the fluid pressure pump in a case where the switch signal is inputted from any one of the first operation valve and the second operation valve. 2. The working machine control system according to claim 1, wherein the fluid pressure pump includes a swash plate whose inclination angle is adjusted by a single regulator to be controlled by a pilot pressure, and the inclination angle of the swash plate is adjusted in such a manner that the higher the pilot pressure acting on the regulator, the more the discharge flow rate increases. 3. The working machine control system according to claim 2, wherein the communication switching valve is switched by a switch signal that is a pilot pressure for switching the first operation valve or the second operation valve,wherein the discharge flow rate adjusting device includes: a first high-pressure selection circuit configured to select the highest one of pilot pressures for switching the first operation valve to allow communication of the selected pilot pressure; anda second high-pressure selection circuit configured to select the highest one of pilot pressures for switching the second operation valve to allow communication of the selected pilot pressure, andwherein the communication switching valve includes: a first communication switching valve so as to be switched, by the pilot pressure guided from the second high-pressure selection circuit, from a state where the second discharge port and the second neutral passage communicate with each other to a state where the second discharge port and the first neutral passage communicate with each other; anda second communication switching valve so as to be switched, by the pilot pressure guided from the first high-pressure selection circuit, from a state where the first discharge port and the first neutral passage communicate with each other to a state where the first discharge port and the second neutral passage communicate with each other. 4. The working machine control system according to claim 3, wherein the discharge flow rate adjusting device further includes: a high-pressure selection valve configured to select higher one of the pilot pressures guided from the first high-pressure selection circuit and the second high-pressure selection circuit to cause the selected pilot pressure to act on the regulator; anda differential pressure reduction valve configured to reduce the pilot pressure acting on the regulator as a pressure difference between the pilot pressures guided from the first high-pressure selection circuit and the second high-pressure selection circuit increases. 5. The working machine control system according to claim 4, wherein the discharge flow rate adjusting device further includes a switching valve that is switched by the pilot pressure guided from the first high-pressure selection circuit and the pilot pressure guided from the second high-pressure selection circuit so that higher one of the pilot pressures guided from the first high-pressure selection circuit and the second high-pressure selection circuit is blocked and lower one of the pilot pressures is caused to act on the differential pressure reduction valve, andwherein the differential pressure reduction valve reduces the pilot pressure acting on the regulator as a pressure difference between the pilot pressure acting on the regulator and the pilot pressure acting through the switching valve increases. 6. The working machine control system according to claim 2, wherein the communication switching valve is switched by a switch signal that is an electric signal outputted via a switching operation for the first operation valve or the second operation valve,wherein the discharge flow rate adjusting device includes: a pilot pump configured to generate a pilot pressure;a first pressure reduction valve configured to guide, when the electric signal is inputted only from the first operation valve, the pilot pressure from the pilot pump to the communication switching valve so as to allow the second discharge port and the first neutral passage to communicate with each other; a second pressure reduction valve configured to guide, when the electric signal is inputted only from the second operation valve, the pilot pressure from the pilot pump to the communication switching valve so as to allow the first discharge port and the second neutral passage to communicate with each other; anda third pressure reduction valve configured to reduce, when the electric signal is inputted from any one of the first operation valve and the second operation valve, the pilot pressure guided from the pilot pump to the regulator. 7. The working machine control system according to claim 1, wherein the first condition is a condition in which the communication switching valve is switched by a first switching signal for switching from the normal position of the first operation valve to a switched position, andthe second condition is a condition in which the communication switching valve is switched by a second switching signal for switching the normal position of the second operation valve to a switched position.
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이 특허에 인용된 특허 (2)
Kondo Masami,JPX, Hydraulic circuit for turning excavator.
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