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公开(公告)号：US10662619B2
公开(公告)日：2020-05-26
申请号：US15739457
申请日：2016-06-02
申请人： Yanmar Co., Ltd.
发明人： Kunihiko Sakamoto
IPC分类号： E02F9/22 , F15B11/17 , F15B11/042 , F15B13/02
摘要： A hydraulic apparatus for a hydraulic work vehicle capable of supplying pressure oil to any of a bucket cylinder, an arm cylinder, a boom cylinder, a swing cylinder, a blade cylinder, a turning hydraulic motor, a left traveling hydraulic motor, a right traveling hydraulic motor, and a PTO hydraulic motor by a first hydraulic pump, a second hydraulic pump, or a third hydraulic pump. The pressure oil can be branched off from a discharge oil passage of the third hydraulic pump and supplied through an external pipe to a downstream side of a load check valve disposed on an oil passage communicating with a pump port of a PTO control valve for switching supply of pressure oil from the second hydraulic pump to an external hydraulic work machine.
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公开(公告)号：US20200096015A1
公开(公告)日：2020-03-26
申请号：US16497187
申请日：2018-02-08
申请人： VOITH PATENT GMBH
发明人： THOMAS ZELLER , ROUVEN HOHAGE
IPC分类号： F15B11/17
摘要： An apparatus for controlling a hydraulic machine, for example a turbine, pump or pump turbine, using variable-speed driven fixed displacement pumps. The apparatus includes a device for carrying out an emergency shut-off that is characterized by low energy consumption and high efficiency while guaranteeing all the operation-relevant and safety-relevant requirements of a hydraulic machine.
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公开(公告)号：US10584722B2
公开(公告)日：2020-03-10
申请号：US15555281
申请日：2015-09-29
发明人： Seiji Hijikata , Kouji Ishikawa , Takatoshi Ooki , Shinya Imura
IPC分类号： F15B11/024 , E02F9/22 , F15B11/042 , F15B11/16 , F15B11/17
摘要： A hydraulic fluid energy regeneration apparatus of a work machine includes: a regeneration hydraulic motor driven by a return hydraulic fluid; a first hydraulic pump mechanically connected to the regeneration hydraulic motor; a second hydraulic pump that delivers a hydraulic fluid for driving a hydraulic actuator; a confluence line that causes the hydraulic fluid delivered from the first hydraulic pump to join the hydraulic fluid delivered from the second hydraulic pump; a first adjuster configured to adjust the flow rate of the hydraulic fluid of the first hydraulic pump; and a second adjuster configured to adjust the delivery flow rate of the second hydraulic pump. A control device includes: a first calculation section configured to calculate a non-confluence time pump flow rate in the case where the hydraulic actuator is driven solely by the second hydraulic pump and calculate a control command output to the first adjuster such that the flow rate of the hydraulic fluid from the first hydraulic pump is equal to or lower than the non-confluence time pump flow rate; and a second calculation section configured to calculate a target pump flow rate by subtracting from the non-confluence time pump flow rate the flow rate of the hydraulic fluid from the first hydraulic pump and calculate a control command output to the second adjuster such that the target pump flow rate is attained.
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公开(公告)号：US10570931B2
公开(公告)日：2020-02-25
申请号：US15466655
申请日：2017-03-22
IPC分类号： F15B11/17 , B64C29/00 , B64C27/28 , B64C13/42 , B64D41/00 , B64C13/40 , B64C13/36 , B64D29/02 , F15B18/00 , F15B1/26
摘要： A hydraulic system for an aircraft having an engine and an auxiliary power unit includes a first hydraulic subsystem including a first hydraulic pump and a first set of hydraulic-powered components in fluid communication with the first hydraulic pump. The first hydraulic pump is powered by the engine to pump shared hydraulic fluid to the first set of hydraulic-powered components. The hydraulic system includes a second hydraulic subsystem including a second hydraulic pump and a second set of hydraulic-powered components in fluid communication with the second hydraulic pump. The second hydraulic pump is powered by the auxiliary power unit to pump the shared hydraulic fluid to the second set of hydraulic-powered components. A shared return line subsystem and reservoir is in fluid communication with the first and second hydraulic subsystems to return the shared hydraulic fluid to the first and second hydraulic pumps.
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公开(公告)号：US10550547B2
公开(公告)日：2020-02-04
申请号：US15722998
申请日：2017-10-02
发明人： James Hewitt
摘要： The present invention relates to a hydraulic system comprising a first actuator and a first pump fluidly connected or connectable to the first actuator via a first circuit and adapted to drive the first actuator. The system further comprises a second pump, a second actuator and a third pump, the third pump being fluidly connected or connectable to the second actuator via a second circuit and adapted to drive the second actuator. To assist the first and third pumps in moving the first and second actuators, the second pump is connectable to the first and second actuators via first and second control valves.
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公开(公告)号：US20200002920A1
公开(公告)日：2020-01-02
申请号：US16448529
申请日：2019-06-21
申请人： KUBOTA CORPORATION
发明人： Yuji FUKUDA
摘要： A hydraulic system includes an output fluid tube connected to a hydraulic pump to output operation fluid, and an unload valve to be switched to output operation fluid or to stop outputting operation fluid, the unload valve being connected to the output fluid tube. The hydraulic system includes a hydraulic actuator to be actuated by operation fluid, a control valve to control operation fluid to be supplied to the hydraulic actuator with use of a pilot fluid that is operation fluid applied to a pressure-receiving portion of the control valve, a pilot fluid tube connected to the pressure-receiving portion of the control valve, an operation valve to change a pressure of the pilot fluid to be applied to the pilot fluid tube, and a warm-up fluid tube connected between the unload valve and the pilot fluid tube.
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公开(公告)号：US10385545B2
公开(公告)日：2019-08-20
申请号：US15506799
申请日：2016-07-29
申请人： Komatsu Ltd.
发明人： Yuta Kamoshita , Tadashi Kawaguchi , Teruo Akiyama
摘要： A control system includes a cylinder pressure data acquisition unit that acquires cylinder pressure data indicating a pressure of operating oil of a hydraulic cylinder; an operation amount data acquisition unit that acquires operation amount data of an operating device; a pump flow rate calculation unit that calculates a first pump flow rate indicating a flow rate of the operating oil discharged from a first hydraulic pump and a second pump flow rate indicating a flow rate of the operating oil discharged from a second hydraulic pump in a splitting state in which a passage is closed based on the cylinder pressure data and the operation amount data; and a pump control unit that controls the first hydraulic pump and the second hydraulic pump based on the first pump flow rate and the second pump flow rate.
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公开(公告)号：US20190203444A1
公开(公告)日：2019-07-04
申请号：US16302318
申请日：2017-05-17
申请人： FLUTRON AB
发明人： Stig Stenlund
IPC分类号： E02F9/22 , E02F9/26 , F15B11/17 , F15B21/14 , F15B11/046 , F15B11/042
CPC分类号： E02F9/2203 , E02F9/2228 , E02F9/2235 , E02F9/2267 , E02F9/2271 , E02F9/2292 , E02F9/2296 , E02F9/26 , F15B11/0426 , F15B11/046 , F15B11/17 , F15B15/202 , F15B21/14 , F15B2211/20507 , F15B2211/20515 , F15B2211/20546 , F15B2211/20576 , F15B2211/2656 , F15B2211/30565 , F15B2211/31582 , F15B2211/6306 , F15B2211/6309 , F15B2211/633 , F15B2211/6333 , F15B2211/6336 , F15B2211/6346 , F15B2211/6652 , F15B2211/6654 , F15B2211/7053 , F15B2211/7058 , F15B2211/7135 , F15B2211/75 , F15B2211/755 , F15B2211/7656 , F15B2211/78 , F15B2211/88
摘要： A operator supporting electrohydraulic drive and control system based on, position sensors (8) (9), a electronic control unite ECU (2), a recovery, storing and re-use system for energy, and with actuator (3) (4) and the drive control valve (6) (7) bolted together in one (3+6) (4+7) unite and with the valve (6) (7) independently of the ECU (2) is controlling effective use of pump capacity and recovery of energy and with control of speed for low speeds, or prevented speed by valves (6) (7) or pump (10) (10a) (11) (11a) displacement and for higher speed with control of deplacement of pumps and motors and with valves (6) (7) at the same time controlled to be fully open.
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公开(公告)号：US20190145433A1
公开(公告)日：2019-05-16
申请号：US16098013
申请日：2017-04-25
发明人： Randall D. Thompson , Ralf Gomm , Vivek Bhaskar , Björn Eriksson
CPC分类号： F15B11/17 , E02F9/2292 , F15B2211/20515 , F15B2211/20523 , F15B2211/20576 , F15B2211/613 , F15B2211/7142 , F15B2211/781 , F15B2211/88
摘要： A hydraulic system includes one or more hydraulic subsystems that have a source of additional flow for supplying an auxiliary system. The hydraulic system may include one or more actuator systems, a boost system, and a further hydraulic system, such as a steering system. The source of additional flow for supplying the auxiliary system may include: sizing the boost system for providing both full boost function and auxiliary function, sizing the steering system for providing both full steering function and auxiliary function, utilizing available flow from an unused actuator function, and/or utilizing a selector manifold for actively selecting the source of auxiliary flow based on the flow and pressure demands of the respective hydraulic systems. Such a hydraulic system enables flow to be available to an auxiliary function regardless of the flow requirements for the actuator functions and/or other vehicle functions, while also minimizing interactions and flow disruptions to the various hydraulic subsystems.
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公开(公告)号：US10280594B2
公开(公告)日：2019-05-07
申请号：US15554601
申请日：2016-02-23
发明人： Seiji Hijikata , Kouji Ishikawa , Shinya Imura
摘要： A hydraulic fluid energy regeneration system for a work machine capable of securely maintaining a brake pressure even when a solenoid valve or the like is erroneously rendered open by an electrical failure is provided. The hydraulic fluid energy regeneration system for a work machine, including a first hydraulic actuator; a second hydraulic actuator; and a first hydraulic pump that supplies a hydraulic fluid to the first hydraulic actuator via a first hydraulic line, includes: an upper control valve that is connected to a discharge side on which the hydraulic fluid is discharged from the second hydraulic actuator when an object to be driven by the second hydraulic actuator falls under its own weight, and that can regulate a flow rate of the hydraulic fluid discharged from the second hydraulic actuator; a communication hydraulic line that connects the upper control valve to a hydraulic fluid tank; a lower control valve that is provided in the communication hydraulic line and that can regulate a flow rate of the hydraulic fluid discharged from the upper control valve to the hydraulic fluid tank; and a regeneration hydraulic line that has one end side connected to a branch section between the upper control valve and the lower control valve in the communication hydraulic line and that has an other end side connected to the first hydraulic line.
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