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    HYDRAULIC SYSTEM FOR WORKING MACHINE, AND WORKING MACHINE
    1.
    发明公开
    HYDRAULIC SYSTEM FOR WORKING MACHINE, AND WORKING MACHINE 审中-公开

    公开(公告)号：US20230323636A1

    公开(公告)日：2023-10-12

    申请号：US18122847

    申请日：2023-03-17

    申请人： KUBOTA CORPORATION

    发明人： Masaki INAOKA ,  Daiki ABE ,  Takumi USUI

    IPC分类号： E02F9/22

    CPC分类号： E02F9/2292 ,  E02F9/2217 ,  E02F9/2285 ,  E02F3/3414

    摘要： A hydraulic system for a working machine includes: a first hydraulic pump; a first hydraulic device; a hydraulic fluid tank; a first discharge fluid passage to allow hydraulic fluid discharged from the first hydraulic device to flow into the tank; a second hydraulic pump to suck fluid from the tank through a suction fluid passage; a second hydraulic device in which difference between flow rate of fluid from the second hydraulic pump device and that of discharged fluid changes according to actuation; a second discharge fluid passage connected to a suction port of the first hydraulic pump and allowing fluid discharged from the second hydraulic device to flow into the first hydraulic pump; a connecting fluid passage branching from the second discharge fluid passage and connected to the suction fluid passage between the tank and the second hydraulic pump; a supplier to supply fluid to the second discharge fluid passage.

    WORKING MACHINE
    2.
    发明申请
    WORKING MACHINE 有权

    公开(公告)号：US20210404150A1

    公开(公告)日：2021-12-30

    申请号：US17360398

    申请日：2021-06-28

    申请人： KUBOTA CORPORATION

    发明人： Yuji FUKUDA ,  Ryota HAMAMOTO ,  Jun TOMITA ,  Daiki ABE

    IPC分类号： E02F9/22

    摘要： A working machine includes a prime mover, a traveling pump driven by a power of the prime mover to deliver operation fluid, a traveling motor rotated by the operation fluid delivered from the traveling pump to have a rotation speed stage shiftable between a first speed stage and a second speed stage higher than the first speed stage, a traveling switching valve shiftable between a first state where the rotation speed stage of the traveling motor is set to the first speed stage and a second state where the rotation speed stage of the traveling motor is set to the second speed stage, an actuation valve configured to change a pilot pressure of a pilot fluid to control a flow of operation fluid delivered from the traveling pump, and a controller configured to control the pilot pressure of the pilot fluid output from the actuation valve so that a value of the pilot pressure differs depending on whether the set rotation speed stage of the traveling motor is the first speed stage or the second speed stage.

    WORKING MACHINE
    3.
    发明公开
    WORKING MACHINE 审中-公开

    公开(公告)号：US20230228062A1

    公开(公告)日：2023-07-20

    申请号：US18075917

    申请日：2022-12-06

    申请人： KUBOTA CORPORATION

    发明人： Ryota HAMAMOTO ,  Kazuki UEDA ,  Daiki ABE

    IPC分类号： E02F9/22 ,  E02F9/20

    CPC分类号： E02F9/2228 ,  E02F9/2004 ,  E02F9/2246 ,  E02F9/2253 ,  E02F9/2267 ,  E02F9/2285 ,  E02F9/2292

    摘要： A working machine includes a controller that performs shift shock reduction control when shift-down switching from a second state to a first state, in which a motor speed can be increased up to a first maximum speed lower than a second maximum speed available in the second state, is performed. The controller includes a first processor configured to, based on a drop amount that is a difference between target and actual numbers of revolutions of a prime mover, compute a first reduction amount for reducing an amount of hydraulic fluid supply from a traveling pump to a traveling motor, a second processor configured to compute a second reduction amount based on a degree of straight traveling of a machine body, and a reduction controller configured to, based on the first or second reduction amount, whichever is larger in absolute value, perform the shift shock reduction control.

    WORK VEHICLE AND METHOD FOR CONTROLLING WORK VEHICLE
    4.
    发明申请
    WORK VEHICLE AND METHOD FOR CONTROLLING WORK VEHICLE 有权

    公开(公告)号：US20230044116A1

    公开(公告)日：2023-02-09

    申请号：US17844071

    申请日：2022-06-20

    申请人： Kubota Corporation

    发明人： Daiki ABE ,  Ryota HAMAMOTO ,  Yuki BUNRYO

    IPC分类号： E02F9/22 ,  B62D11/00 ,  B62D11/04 ,  E02F9/26

    摘要： A method for controlling a work vehicle includes driving a first hydraulic pump and a second hydraulic pump by an engine to supply hydraulic fluid to a first hydraulic motor and a second hydraulic motor, respectively, to drive a first traveling device and a second traveling device, respectively. An operation state of a direction input device to operate a traveling direction of the work vehicle is detected. Based on the operation state detected, whether or not a traveling state of the work vehicle is a turning state. When it is determined that the traveling state is the turning state, a rotation command to decrease a target rotational speed of the engine from a first rotational speed to a second rotational speed is output.

    HYDRAULIC SYSTEM FOR WORK MACHINE
    5.
    发明申请
    HYDRAULIC SYSTEM FOR WORK MACHINE 审中-公开

    公开(公告)号：US20200240113A1

    公开(公告)日：2020-07-30

    申请号：US16848849

    申请日：2020-04-15

    申请人： KUBOTA CORPORATION

    发明人： Yuji FUKUDA ,  Daiki ABE ,  Jun TOMITA ,  Yuya KONISHI ,  Ryosuke KINUGAWA

    IPC分类号： E02F9/22 ,  F15B11/16 ,  F15B13/044

    摘要： A hydraulic system for a work machine includes a travel hydraulic device which changes a travel speed in accordance with switching positions of a hydraulic switch valve. A controller controls a proportional valve so as to change a pressure of an operation fluid at an increasing rate over a time while the hydraulic switch valve is switched from a first switching position to a second switching position to increase the travel speed from a first speed to a second speed, and at a decreasing rate over the time while the hydraulic switch valve is switched from the second switching position to the first switching position to decrease the travel speed from the second speed to the first speed. A magnitude of the increasing rate is different from one of the decreasing rate to output an operation fluid.

    WORKING MACHINE
    7.
    发明公开
    WORKING MACHINE 审中-公开

    公开(公告)号：US20230349402A1

    公开(公告)日：2023-11-02

    申请号：US18221055

    申请日：2023-07-12

    申请人： KUBOTA CORPORATION

    发明人： Daiki ABE ,  Ryota HAMAMOTO ,  Hiroaki NAKAGAWA

    IPC分类号： F15B21/0423 ,  F01P7/04 ,  E02F9/22

    CPC分类号： F15B21/0423 ,  F01P7/044 ,  E02F9/226 ,  F15B2211/62 ,  F15B21/02

    摘要： A working machine includes a prime mover, a hydraulic pump driven by power of the prime mover, a cooler including a cooling fan rotated by either the power of the prime mover or hydraulic fluid delivered from the hydraulic pump, and a controller configured or programmed to perform a reduction control for reducing a target fan rotation speed that is a target rotation speed of the cooling fan in response to reduction of an actual prime mover rotation speed that is an actual rotation speed of the prime mover, and to perform, after the reduction control, a restoration control for restoring the target fan rotation speed. The controller is configured or programmed to make a difference between a reduction rate of the target fan rotation speed in the reduction control and an increase rate of the target fan rotation speed in the restoration control.

    WORKING MACHINE
    9.
    发明公开
    WORKING MACHINE 审中-公开

    公开(公告)号：US20230220913A1

    公开(公告)日：2023-07-13

    申请号：US18118813

    申请日：2023-03-08

    申请人： KUBOTA CORPORATION

    发明人： Ryota HAMAMOTO ,  Kazuki UEDA ,  Daiki ABE ,  Kohei NAGAO

    IPC分类号： F16H61/421 ,  E02F9/22 ,  F16H61/47 ,  F16H61/66

    CPC分类号： F16H61/421 ,  E02F9/2246 ,  F16H61/47 ,  E02F9/2253 ,  F16H2061/6615

    摘要： A working machine includes: a machine body provided thereon with a traveling pump and a traveling motor; a traveling change-over valve shiftable between a first state where a rotation speed of the traveling motor is set to a first speed and a second state where the rotation speed is set to a second speed; an actuation valve operable to control a flow of operation fluid to an operation valve that changes a pressure of operation fluid to be applied to the traveling pump according to operation of an operation member; and a controller to perform a shock-mitigation control for reducing an opening degree of the actuation valve when the traveling change-over valve is shifted from the first state to the second state. The controller determines a reduction amount of the opening degree of the actuation valve reduced by the shock-mitigation control, based on a straight-traveling degree of the machine body.

    WORK VEHICLE AND CONTROL METHOD FOR FAN OF WORK VEHICLE
    10.
    发明公开
    WORK VEHICLE AND CONTROL METHOD FOR FAN OF WORK VEHICLE 审中-公开

    公开(公告)号：US20230203789A1

    公开(公告)日：2023-06-29

    申请号：US17946047

    申请日：2022-09-16

    申请人： Kubota Corporation

    发明人： Yuji FUKUDA ,  Hiroaki NAKAGAWA ,  Ryota HAMAMOTO ,  Yasuhiro NISHIDA ,  Daiki ABE

    IPC分类号： E02F9/22 ,  F01P7/04

    CPC分类号： E02F9/226 ,  F01P7/044 ,  E02F9/2296

    摘要： A control method for a fan of a work vehicle includes supplying, when an engine is started, a first current to a solenoid of a variable relief valve such that the hydraulic fluid flows by a first flow rate, supplying, when a rotational speed of the engine becomes larger than a first rotational speed threshold value, a second current larger than the first current to the solenoid such that the hydraulic fluid flows by a second flow rate smaller than the first flow rate to reduce the rotational speed of the fan, and supplying, when the rotational speed of the engine becomes larger than a second rotational speed threshold value that is larger than the first rotational speed threshold value, a current to the solenoid to change the rotational speed of the fan, the current corresponding to a temperature of liquid flowing in the work vehicle.