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92 条记录 (耗时 0.035 秒)

    HYDRAULIC SYSTEM FOR WORKING MACHINE
    41.
    发明申请
    HYDRAULIC SYSTEM FOR WORKING MACHINE 审中-公开

    公开(公告)号：US20190301142A1

    公开(公告)日：2019-10-03

    申请号：US16364661

    申请日：2019-03-26

    申请人： KUBOTA CORPORATION

    发明人： Yuji FUKUDA ,  Yoshimitsu TANAKA ,  Keigo HONDA

    IPC分类号： E02F9/22 ,  F15B11/16

    摘要： A hydraulic system includes a hydraulic pump, a first hydraulic actuator, a second hydraulic actuator, a first control valve to control the first hydraulic actuator, and a second control valve to control the second hydraulic actuator, the second control valve being arranged on a downstream side of the first control valve. The hydraulic system includes a first fluid tube in which a return fluid flows toward the second control valve. The first fluid tube couples the first control valve to the second control valve. The hydraulic system includes a second fluid tube in which a supply fluid flows toward to the first hydraulic actuator. The second fluid tube being connected to the first hydraulic actuator. The hydraulic system further a third fluid tube in which the return fluid in the first fluid tube flows toward the second fluid tube.

    HYDRAULIC SYSTEM FOR WORKING MACHINE
    42.
    发明申请
    HYDRAULIC SYSTEM FOR WORKING MACHINE 审中-公开

    公开(公告)号：US20190301141A1

    公开(公告)日：2019-10-03

    申请号：US16364637

    申请日：2019-03-26

    申请人： KUBOTA CORPORATION

    发明人： Yuji FUKUDA ,  Yoshimitsu TANAKA ,  Keigo HONDA

    IPC分类号： E02F9/22

    摘要： A hydraulic system includes a hydraulic pump, a first hydraulic actuator, a second hydraulic actuator, a first control valve to control the first hydraulic actuator, and a second control valve to control the second hydraulic actuator, the second control valve being arranged on a downstream side of the first control valve. The hydraulic system includes a discharge fluid tube in which the operation fluid flows. The discharge fluid tube is connected to the first control valve. The hydraulic system includes a first fluid tube in which a return fluid flows toward the second control valve. The first fluid tube couples the first control valve to the second control valve. The hydraulic system includes a second fluid tube in which the return fluid flows toward the discharge fluid tube, and a third fluid tube in which a supply fluid flows toward the first fluid tube.

    HYDRAULIC SYSTEM FOR WORKING MACHINE
    43.
    发明申请
    HYDRAULIC SYSTEM FOR WORKING MACHINE 审中-公开

    公开(公告)号：US20190301137A1

    公开(公告)日：2019-10-03

    申请号：US16366175

    申请日：2019-03-27

    申请人： KUBOTA CORPORATION

    发明人： Yuji FUKUDA ,  Keigo HONDA

    IPC分类号： E02F9/20 ,  E02F9/22

    摘要： A hydraulic system for a working machine includes a hydraulic pump, a first hydraulic actuator, a second hydraulic actuator, a first control valve to control the first hydraulic actuator, a second control valve to control the second hydraulic actuator, and a discharge fluid tube in which the operation fluid flows. The discharge fluid tube is connected to the first control valve. The hydraulic system includes a first fluid tube in which a return fluid flows toward the second control valve. The first fluid tube couples the first control valve to the second control valve. The hydraulic system includes a second fluid tube coupling the first fluid tube and the discharge fluid tube, a first throttle disposed on the first fluid tube, and a second throttle disposed on the second fluid tube, the second throttle having an opening area smaller than an opening area of the first throttle.

    WORK MACHINE
    44.
    发明申请
    WORK MACHINE 审中-公开

    公开(公告)号：US20170370073A1

    公开(公告)日：2017-12-28

    申请号：US15626505

    申请日：2017-06-19

    申请人： KUBOTA CORPORATION

    发明人： Yuji FUKUDA ,  Ryosuke KINUGAWA

    IPC分类号： E02F9/22 ,  E02F9/20 ,  E02F3/42 ,  E02F9/16 ,  E02F3/34

    CPC分类号： E02F9/2246 ,  E02F3/3414 ,  E02F3/422 ,  E02F9/166 ,  E02F9/2062 ,  E02F9/2066 ,  E02F9/207 ,  E02F9/2285 ,  E02F9/2292 ,  E02F9/2296

    摘要： A work machine includes a prime mover, a hydraulic pump to be operated by the prime mover to output an operation fluid, a hydraulic device to be operated by the operation fluid, a measurement sensor to measure a first temperature and a second temperature, the first temperature being a temperature of the operation fluid at starting of the prime mover, the second temperature being a temperature of the operation fluid after the starting of the prime mover, and a controller including a determiner to determine an upper limit revolution speed based on the first temperature, the upper limit revolution speed being an upper limit of a revolution speed of the prime mover, and a changer to change the upper limit revolution speed based on the second temperature.

    HYDRAULIC SYSTEM FOR WORK MACHINE
    45.
    发明申请
    HYDRAULIC SYSTEM FOR WORK MACHINE 审中-公开

    公开(公告)号：US20170350095A1

    公开(公告)日：2017-12-07

    申请号：US15615056

    申请日：2017-06-06

    申请人： KUBOTA CORPORATION

    发明人： Yuji FUKUDA ,  Kazuyoshi ARII ,  Ryohei SUMIYOSHI

    IPC分类号： E02F9/22 ,  F04B1/26

    CPC分类号： F04B1/26 ,  E02F3/3414 ,  E02F9/166 ,  E02F9/2025 ,  E02F9/2285 ,  E02F9/2292

    摘要： A hydraulic system for a work machine includes an operation member, a prime mover, a hydraulic pump driven by the prime mover, the hydraulic pump configured to output an operation fluid, a first temperature sensor to measure a temperature of the operation fluid, a first fluid tube connected to the hydraulic pump, an operation valve connected to the first fluid tube, the operation valve configured to control, in accordance with an operation extent of the operation member, a pressure of the outputted operation fluid, a hydraulic apparatus driven by the operation fluid outputted from the operation valve, a second hydraulic tube connecting the operation valve to the hydraulic apparatus, a discharge fluid tube to discharge the operation fluid included in the second fluid tube; and an actuation valve disposed on the discharge fluid tube, the actuation valve configured to control an aperture of the actuation valve based on the temperature.

    HYDRAULIC SYSTEM FOR WORK MACHINE
    48.
    发明申请
    HYDRAULIC SYSTEM FOR WORK MACHINE 审中-公开

    公开(公告)号：US20170282934A1

    公开(公告)日：2017-10-05

    申请号：US15475136

    申请日：2017-03-31

    申请人： KUBOTA CORPORATION

    发明人： Yuji FUKUDA ,  Ryosuke KINUGAWA ,  Kazuyoshi ARII

    IPC分类号： B60W50/08

    CPC分类号： B60W50/085 ,  B60W30/1884 ,  B60W2300/17 ,  B60W2510/0652 ,  B60W2710/305

    摘要： A hydraulic system for a work machine includes a prime mover, a setup member, a hydraulic pump, an operation valve, a hydraulic device, and a memory. The memory stores first control characteristics indicating relations between the first pressure and an actual revolution speed of the prime mover, and stores a second control characteristic indicating a relation between the first pressure and the actual revolution speed of the prime mover. The hydraulic system includes a controller to set the first pressure based on the second control characteristic when a dropping amount of the actual revolution speed from the target revolution speed is less than a threshold value and to set the first pressure based on the first control characteristics determined corresponding to the target revolution speed when the dropping amount of the actual revolution speed from the target revolution speed is the threshold value or more.