[특허]Hydraulic drive system for construction machine

Hitachi Construction Machinery Tierra Co., Ltd.

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특허 상세정보

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내보내기 페이스북 공유 트위터 공유 카카오톡 공유

Hydraulic drive system for construction machine

특허상세정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	F16D-031/02 E02F-009/22 F15B-011/16 E02F-003/32 E02F-003/96 F15B-011/17 E02F-003/42 E02F-009/02 F15B-009/17
출원번호	US-0417977 (2013-06-19)
등록번호	US-9845589 (2017-12-19)
우선권정보	JP-2012-169577 (2012-07-31)
국제출원번호	PCT/JP2013/066835 (2013-06-19)
국제공개번호	WO2014/021015 (2014-02-06)
발명자 / 주소	Tsuruga, Yasutaka Takahashi, Kiwamu
출원인 / 주소	Hitachi Construction Machinery Tierra Co., Ltd.
대리인 / 주소	Crowell & Moring LLP
인용정보	피인용 횟수 : 2 인용 특허 : 2

초록
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In a hydraulic drive system performing the load sensing control by using a pump device having two delivery ports whose delivery flow rates are controlled by a single pump controller, surplus flow is prevented and energy loss at an unload valve and a pressure compensating valve is reduced in combined operations in which two actuators are driven at the same time while producing a relatively large supply flow rate difference therebetween. A boom cylinder 3a is connected so that the hydraulic fluids delivered from delivery ports P1 and P2 of a pump device 1a are merged and supplied to the boom cylinder 3a. An arm cylinder 3h is connected so that the hydraulic fluids delivered from delivery ports P3 and P4 of a pump device 1b are merged and supplied to the arm cylinder 3h. A travel motor 3d is connected so that the hydraulic fluid delivered from one (delivery port P2) of the delivery ports of the pump device 1a and the hydraulic fluid delivered from one (delivery port P4) of the delivery ports of the pump device 1b are merged and supplied to the travel motor 3d. A travel motor 3e is connected so that the hydraulic fluid delivered from the other (delivery port P1) of the delivery ports of the pump device 1a and the hydraulic fluid delivered from the other (delivery port P3) of the delivery ports of the pump device 1b are merged and supplied to the travel motor 3e.

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청구항
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1. A hydraulic drive system for a construction machine comprising: a first pump device having first and second delivery ports;a second pump device having third and fourth delivery ports; anda plurality of actuators which are driven by hydraulic fluid delivered from the first and second delivery ports of the first pump device and hydraulic fluid delivered from the third and fourth delivery ports of the second pump device, wherein:the first pump device includes a first pump controller which is provided for the first and second delivery ports as a common controller, andthe second pump device includes a second pump controller which is provided for the third and fourth delivery ports as a common controller, andthe first pump controller includes a first load sensing control unit which controls displacement of the first hydraulic pump device so that delivery pressures of the first and second delivery ports of the first hydraulic pump device become higher than maximum load pressure of the actuators driven by the hydraulic fluid delivered from the first and second delivery ports by a prescribed pressure and a first torque control unit which performs limiting control of the displacement of the first hydraulic pump device so that absorption torque of the first hydraulic pump device does not exceed a prescribed value, andthe second pump controller includes a second load sensing control unit which controls displacement of the second hydraulic pump device so that delivery pressures of the third and fourth delivery ports of the second hydraulic pump device become higher than maximum load pressure of the actuators driven by the hydraulic fluid delivered from the third and fourth delivery ports by a prescribed pressure and a second torque control unit which performs limiting control of the displacement of the second hydraulic pump device so that absorption torque of the second hydraulic pump device does not exceed a prescribed value, andthe plurality of actuators include first and second actuators which are driven at the same time in a certain combined operation of the construction machine while producing a relatively large supply flow rate difference therebetween, andthe first actuator is connected so that hydraulic fluids delivered from the first and second delivery ports of the first pump device are merged and supplied to the first actuator, andthe second actuator is connected so that hydraulic fluids delivered from the third and fourth delivery ports of the second pump device are merged and supplied to the second actuator, andthe plurality of actuators include third and fourth actuators which are driven at the same time in another operation of the construction machine while achieving a prescribed function by their supply flow rates becoming equivalent to each other, andthe third actuator is connected so that hydraulic fluid delivered from one of the first and second delivery ports of the first pump device and hydraulic fluid delivered from one of the third and fourth delivery ports of the second pump device are merged and supplied to the third actuator, andthe fourth actuator is connected so that hydraulic fluid delivered from the other of the first and second delivery ports of the first pump device and hydraulic fluid delivered from the other of the third and fourth delivery ports of the second pump device are merged and supplied to the fourth actuator. 2. The hydraulic drive system for a construction machine according to claim 1, further comprising: a first travel communication valve which is arranged between the first and second delivery ports of the first pump device, situated at an interrupting position for interrupting communication between the first and second delivery ports at the time other than combined operation in which the third and fourth actuators and at least one of other actuators related to the first pump device are driven at the same time, and switched to a communicating position for communicating the first and second delivery ports to each other at the time of the combined operation in which the third and fourth actuators and at least one of other actuators related to the first pump device are driven at the same time; anda second travel communication valve which is arranged between the third and fourth delivery ports of the second pump device, situated at an interrupting position for interrupting communication between the third and fourth delivery ports at the time other than combined operation in which the third and fourth actuators and at least one of other actuators related to the second pump device are driven at the same time, and switched to a communicating position for communicating the third and fourth delivery ports to each other at the time of the combined operation in which the third and fourth actuators and at least one of other actuators related to the second pump device are driven at the same time. 3. The hydraulic drive system for a construction machine according to claim 1, wherein: the construction machine is a hydraulic excavator having a front work implement, andthe first actuator is a boom cylinder for driving a boom of the front work implement, andthe second actuator is an arm cylinder for driving an arm of the front work implement. 4. The hydraulic drive system for a construction machine according to claim 1, wherein: the construction machine is a hydraulic excavator having a lower track structure equipped with left and right crawlers, andthe third actuator is a travel motor for driving one of the left and right crawlers, andthe fourth actuator is a travel motor for driving the other of the left and right crawlers. 5. The hydraulic drive system for a construction machine according to claim 1, wherein each of the first and second pump devices is a hydraulic pump of the split flow type having a single displacement control mechanism. 6. The hydraulic drive system for a construction machine according to claim 1, wherein: the first pump torque control unit of the first pump device controls the displacement of the first hydraulic pump device so that total absorption torque of the first and second hydraulic pump devices does not exceed a prescribed value by feeding back not only the delivery pressures of the first and second delivery ports of the first hydraulic pump device related to itself but also the delivery pressures of the third and fourth delivery ports of the second hydraulic pump device, andthe second pump torque control unit of the second pump device controls the displacement of the second hydraulic pump device so that total absorption torque of the first and second hydraulic pump devices does not exceed a prescribed value by feeding back not only the delivery pressures of the third and fourth delivery ports of the second hydraulic pump device related to itself but also the delivery pressures of the first and second delivery ports of the first hydraulic pump device. 7. A hydraulic drive system for a construction machine, comprising: a first pump device having first and second delivery ports;a second pump device having third and fourth delivery ports; anda plurality of actuators which are driven by hydraulic fluid delivered from the first and second delivery ports of the first pump device and hydraulic fluid delivered from the third and fourth delivery ports of the second pump device, wherein:the first pump device includes a first pump controller which is provided for the first and second delivery ports as a common controller, andthe second pump device includes a second pump controller which is provided for the third and fourth delivery ports as a common controller, andthe first pump controller includes a first load sensing control unit which controls displacement of the first hydraulic pump device so that delivery pressures of the first and second delivery ports of the first hydraulic pump device become higher than maximum load pressure of the actuators driven by the hydraulic fluid delivered from the first and second delivery ports by a prescribed pressure and a first torque control unit which performs limiting control of the displacement of the first hydraulic pump device so that absorption torque of the first hydraulic pump device does not exceed a prescribed value, andthe second pump controller includes a second load sensing control unit which controls displacement of the second hydraulic pump device so that delivery pressures of the third and fourth delivery ports of the second hydraulic pump device become higher than maximum load pressure of the actuators driven by the hydraulic fluid delivered from the third and fourth delivery ports by a prescribed pressure and a second torque control unit which performs limiting control of the displacement of the second hydraulic pump device so that absorption torque of the second hydraulic pump device does not exceed a prescribed value, andthe plurality of actuators include first and second actuators which are driven at the same time in a certain combined operation of the construction machine while producing a relatively large supply flow rate difference therebetween, andthe first actuator is connected so that hydraulic fluids delivered from the first and second delivery ports of the first pump device are merged and supplied to the first actuator, andthe second actuator is connected so that hydraulic fluids delivered from the third and fourth delivery ports of the second pump device are merged and supplied to the second actuator, andthe first pump torque control unit of the first pump device controls the displacement of the first hydraulic pump device so that total absorption torque of the first and second hydraulic pump devices does not exceed a prescribed value by feeding back not only the delivery pressures of the first and second delivery ports of the first hydraulic pump device related to itself but also the delivery pressures of the third and fourth delivery ports of the second hydraulic pump device, andthe second pump torque control unit of the second pump device controls the displacement of the second hydraulic pump device so that total absorption torque of the first and second hydraulic pump devices does not exceed a prescribed value by feeding back not only the delivery pressures of the third and fourth delivery ports of the second hydraulic pump device related to itself but also the delivery pressures of the first and second delivery ports of the first hydraulic pump device.

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이 특허를 인용한 특허 피인용횟수: 2

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Hydraulic drive system for construction machine

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Hydraulic drive system for construction machine

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이 특허에 인용된 특허 (2)

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IPC 상세정보(version : 201201)

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