[특허]Multiple fluid pump combination circuit

Eaton Corporation

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특허 상세정보

MyON담기

내보내기 페이스북 공유 트위터 공유 카카오톡 공유

Multiple fluid pump combination circuit

특허상세정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	F15B-011/17
출원번호	US-0095613 (2011-04-27)
등록번호	US-9574579 (2017-02-21)
발명자 / 주소	Dybing, Philip J.
출원인 / 주소	Eaton Corporation
대리인 / 주소	Merchant & Gould P.C.
인용정보	피인용 횟수 : 0 인용 특허 : 28

초록
▼

A method of combining outputs of a plurality of fluid pumps includes receiving an input signal from an input device. The input signal is adapted to control a function of a work vehicle. An actuation signal is sent to a first direction control device of a first actuator assembly. The first actuator assembly is in selective fluid communication with a first pump assembly. A position of a second direction control valve of a second actuator assembly is received. The second actuator assembly is in selective fluid communication with a second pump assembly. A selector valve that is in fluid communication with a cavity of a poppet valve assembly is actuated so that the second pump assembly is in fluid communication with the first actuator assembly when the second direction control valve is in a neutral position.

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1. An actuator system comprising: a first actuator assembly including a first directional control valve in fluid communication with a first actuator;a first pump assembly in fluid communication with the first actuator assembly;a second actuator assembly having a second direction control valve in fluid communication with a second actuator, the second direction control valve having a closed center neutral position;a second pump assembly in selective fluid communication with the second actuator; anda pump combiner assembly adapted to combine fluid from the second pump assembly and the first pump assembly, and provide the combined fluid to the first actuator when the direction control valve is in the neutral position, the pump combiner assembly including: a first fluid inlet in fluid communication with the first pump assembly;a second fluid inlet in fluid communication with the second pump assembly;a first fluid outlet in fluid communication with the first actuator assembly;a second fluid outlet in fluid communication with the second actuator assembly;a poppet valve assembly including a poppet valve and defining a valve bore having a valve seat, the valve seat being disposed between the second fluid inlet and the first fluid outlet, the poppet valve having a first axial end adapted for contact with the valve seat and a second axial end, the valve bore and the second axial end of the poppet valve cooperatively defining a cavity;a one-way valve assembly disposed between the poppet valve assembly and the first fluid outlet, the one-way valve assembly preventing fluid from flowing from the first actuator assembly to the poppet valve assemblya shuttle valve in fluid communication with a second pump assembly load sense port, the shuttle valve comparing fluid pressure from the second pump assembly at a location of the second direction control valve with fluid pressure from the second pump assembly at a location between the poppet valve assembly and the one-way valve assembly, the shuttle valve communicating the higher pressure to the second pump assembly load sense port, anda selector valve in fluid communication with the cavity of the poppet valve assembly, the selector valve being electronically actuated between a first position in which the cavity is in fluid communication with a fluid reservoir and a second position in which the cavity is in fluid communication with the second fluid inlet,wherein the actuator system operates in a first mode in which: the second direction control valve is not in the closed center neutral position;the first pump assembly provides pressurized fluid for powering the first actuator assembly;the second pump assembly provides pressurized fluid for powering the second actuator assembly;the selector valve is in the second position; andthe first axial end of the of the poppet valve contacts the valve seat, wherein the actuator system operates in a second mode in which:the second direction control valve is in the closed center neutral position;the first pump assembly provides pressurized fluid for powering the first actuator assembly;the second pump assembly provides pressurized fluid for powering the first actuator assembly and does not provide pressurized fluid to the second actuator;the selector valve is in the first position; andthe first axial end of the of the poppet valve is offset from the valve seat, andwherein the first pump assembly is hydraulically isolated from the second actuator assembly in both the first and second modes so as to not provide pressurized hydraulic fluid to the second actuator assembly in either of the first and second modes. 2. The actuator system of claim 1, wherein the pump combiner assembly includes a second one-way valve assembly disposed between the first fluid inlet and the first fluid outlet, the second one-way valve assembly preventing fluid from flowing from the first actuator assembly to the first pump assembly. 3. The actuator system of claim 1, further comprising an electronic control unit in electrical communication with the selector valve. 4. The actuator system of claim 3, wherein the direction control valve of the second actuator assembly is actuated by a solenoid. 5. The actuator system of claim 4, wherein the electronic control unit is in electrical communication with the solenoid of the direction control valve of the second actuator assembly. 6. An actuator system comprising: a first actuator assembly having a first direction control valve in fluid communication with a first actuator;a first pump assembly in fluid communication with the first actuator assembly;a second actuator assembly having a second direction control valve in fluid communication with a second actuator, the second direction control valve having a closed center neutral position;a second pump assembly in selective fluid communication with the second actuator;a pump combiner assembly adapted to combine fluid from the second pump assembly and the first pump assembly, and provide the combined fluid to the first actuator when the second direction control valve is in the neutral position, the pump combiner assembly including: a first fluid inlet in fluid communication with the first pump assembly;a second fluid inlet in fluid communication with the second pump assembly;a first fluid outlet in fluid communication with the first actuator assembly;a second fluid outlet in fluid communication with the second actuator assembly;a poppet valve assembly including a poppet valve and defining a valve bore having a valve seat, the valve seat being disposed between the second fluid inlet and the first fluid outlet, the poppet valve having a first axial end adapted for contact with the valve seat and a second axial end, the valve bore and the second axial end of the poppet valve cooperatively defining a cavity;a one-way valve assembly disposed between the poppet valve assembly and the first fluid outlet, the one-way valve assembly preventing fluid from flowing from the first actuator assembly to the poppet valve assemblya shuttle valve in fluid communication with a second pump assembly load sense port, the shuttle valve comparing fluid pressure from the second pump assembly at a location of the second direction control valve with fluid pressure from the second pump assembly at a location between the poppet valve assembly and the one-way valve assembly, the shuttle valve communicating the higher pressure to the second pump assembly load sense port,a selector valve in fluid communication with the cavity of the poppet valve assembly, the selector valve being electronically actuated between a first position in which the cavity is in fluid communication with a fluid reservoir and a second position in which the cavity is in fluid communication with the second fluid inlet; andan electronic control unit in electrical communication with the selector valve and the first direction control valve,wherein the actuator system operates in a first mode in which: the second directional control valve is not in the closed center neutral position;the first pump assembly provides pressurized fluid for powering the first actuator assembly;the second pump assembly provides pressurized fluid for powering the second actuator assembly;the selector valve is in the second position; andthe first axial end of the of the poppet valve contacts the valve seat, wherein the actuator system operates in a second mode in which:the second directional control valve is in the closed center neutral position;the first pump assembly provides pressurized fluid for powering the first actuator assembly;the second pump assembly provides pressurized fluid for powering the first actuator assembly and does not provide pressurized fluid to the second actuator assembly;the selector valve is in the first position; andthe first axial end of the of the poppet valve is offset from the valve seat, andwherein the first pump assembly is hydraulically isolated from the second actuator assembly in both the first and second modes so as to not provide pressurized hydraulic fluid to the second actuator assembly in either of the first and second modes. 7. The actuator system of claim 6, wherein the pump combiner assembly includes a second one-way valve assembly disposed between the first fluid inlet and the first fluid outlet, a second one-way valve assembly preventing fluid from flowing from the first actuator assembly to the first pump assembly. 8. The actuator system of claim 1, wherein the second direction control valve of the second actuator assembly is actuated by a solenoid. 9. The actuator system of claim 8, wherein the electronic control unit is in electrical communication with the solenoid of the second direction control valve of the second actuator assembly. 10. A method for combining outputs of a plurality of fluid pumps, the method comprising: receiving an input signal from an input device, the input signal being adapted to switch a work vehicle from a first mode to a second mode, wherein in the first mode a first pump assembly provides pressurized fluid for powering a first actuator assembly, a second direction control valve of a second actuator assembly is not in a closed center neutral position, a second pump assembly provides pressurized fluid for powering the second actuator assembly, a selector valve that is fluid communication with a cavity of a poppet valve assembly is in a position where the fluid from the first pump assembly is directed to the first actuator assembly and the fluid from the second pump assembly is directed to the second actuator assembly,sending an actuation signal to a first direction control device of the first actuator assembly to switch the work vehicle to the second mode, wherein in the second mode the second direction control valve is in the closed center neutral position, the selector valve is in fluid communication with the cavity of the poppet valve assembly such that the first pump assembly provides pressurized fluid for powering the first actuator assembly and the second pump assembly provides pressurized fluid for powering the first actuator assembly and does not provide pressurized fluid to the second actuator assembly,wherein the first pump assembly is hydraulically isolated from the second actuator assembly in both the first and second modes so as to not provide pressurized hydraulic fluid to the second actuator assembly in either of the first and second modes; andcomparing fluid pressure from the second pump assembly at a location of the second direction control valve with fluid pressure from the second pump assembly at a location between a first fluid outlet of the poppet valve assembly and a one-way valve assembly that prevents fluid from flowing from the first actuator assembly to the poppet valve assembly, and communicating the higher pressure to the second pump assembly load sense port. 11. The method of claim 10, wherein a second one-way valve assembly prevents fluid from flowing from the first actuator assembly to the first pump assembly. 12. The method of claim 11, wherein the second direction control valve includes a solenoid. 13. The method of claim 10, further comprising sending an actuation signal to the direction control valve when a second input signal is received, the second input signal being adapted to control a second function of the work vehicle. 14. The method of claim 10, wherein the first direction control valve includes a solenoid.

이 특허에 인용된 특허 (28)

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특허 상세정보

Multiple fluid pump combination circuit

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이 특허에 인용된 특허 (28)

IPC 상위 출원인

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특허 상세정보

Multiple fluid pump combination circuit

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이 특허에 인용된 특허 (28)

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IPC 상세정보(version : 201201)

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