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    WORKING MACHINE
    1.
    发明公开
    WORKING MACHINE 审中-公开

    公开(公告)号：US20230287654A1

    公开(公告)日：2023-09-14

    申请号：US18073705

    申请日：2022-12-02

    Applicant: KUBOTA CORPORATION

    Inventor： Daiki ABE ,  Ryota HAMAMOTO ,  Jun TOMITA ,  Fumiya KOZONO

    IPC: E02F9/22

    CPC classification number: E02F9/2253 ,  E02F9/2285 ,  E02F9/2267 ,  E02F9/2296 ,  E02F9/2292

    Abstract: A working machine includes a traveling pump to be operated by power of a prime mover and deliver a hydraulic fluid; a traveling motor that rotates using the delivered hydraulic fluid; an operation valve that changes pilot pressure of a pilot fluid outputted to the traveling pump in response to operation of an operation member; an actuation valve that operates based on a control signal and changes primary pressure that is the pilot pressure of the pilot fluid supplied to the operation valve; a controller that controls opening of the actuation valve by outputting the control signal to the actuation valve; and a first detector that detects an actual number of revolutions of the traveling motor. The controller includes a changer that changes setting of the control signal such that the opening of the actuation valve increases as the actual number of revolutions of the traveling motor decreases.

    HYDRAULIC SYSTEM OF WORKING MACHINE
    2.
    发明申请
    HYDRAULIC SYSTEM OF WORKING MACHINE 有权

    公开(公告)号：US20220389680A1

    公开(公告)日：2022-12-08

    申请号：US17830473

    申请日：2022-06-02

    Applicant: KUBOTA CORPORATION

    Inventor： Yuji FUKUDA ,  Jun TOMITA ,  Yuya KONISHI ,  Toshiya TANI ,  Daisuke SAKURAI

    IPC: E02F9/22 ,  F15B13/02

    Abstract: A hydraulic system of a working machine includes a hydraulic pump to output a hydraulic fluid, at least one proportional valve to deliver the hydraulic fluid to a supply target, a valve body including the proportional valve, a heat-up fluid passage in the valve body and into which the hydraulic fluid flows, a switching valve switchable between an open position in which the hydraulic fluid passing through the heat-up fluid passage is supplied to a hydraulic device and a closed position in which the hydraulic fluid is not supplied thereto and the hydraulic fluid from the hydraulic device is to be returned, a controller to operate the switching and proportional valves, and a return circuit through which the hydraulic fluid flowing into the heat-up fluid passage is returned as a result of at least one of the switching and proportional valves being operated by the controller.

    WORKING MACHINE
    3.
    发明申请
    WORKING MACHINE 有权

    公开(公告)号：US20210123214A1

    公开(公告)日：2021-04-29

    申请号：US17077341

    申请日：2020-10-22

    Applicant: KUBOTA CORPORATION

    Inventor： Yuji FUKUDA ,  Ryota HAMAMOTO ,  Jun TOMITA

    IPC: E02F9/22

    Abstract: A working machine includes a switching valve to switch between a first state and a second state, the first state allowing a revolving speed of a traveling motor to be a first speed, the second state allowing the revolving speed of the traveling motor to be a second speed, and a controller device to reduce the revolving speed of the prime mover in either acceleration to switch from the first state to the second state or deceleration to switch from the second state to the first state. The controller device associates a return timing with a switch timing in either the acceleration or deceleration, the return timing allowing an actual revolving speed of a prime mover to start returning toward a first target revolving speed after the actual revolving speed is reduced, the switch timing allowing the switching valve to switch to either an acceleration side or a deceleration side.

    WORKING MACHINE
    4.
    发明申请
    WORKING MACHINE 有权

    公开(公告)号：US20220307229A1

    公开(公告)日：2022-09-29

    申请号：US17839019

    申请日：2022-06-13

    Applicant: KUBOTA CORPORATION

    Inventor： Yuji FUKUDA ,  Jun TOMITA ,  Ryota HAMAMOTO ,  Ryosuke KINUGAWA ,  Yoshimitsu TANAKA

    IPC: E02F9/22 ,  E02F9/02 ,  E02F9/24 ,  F16H61/456 ,  B62D55/06

    Abstract: A working machine is provided, which includes a prime mover, a first traveling pump driven by power of the prime mover to supply operation fluid through a connector fluid tube, a traveling motor including first and second ports connected to the connector fluid tube, the traveling motor configured to be switched in a first speed and a second speed higher than the first speed, a first pressure detector to detect first traveling-pump pressure near the first port, a second pressure detector to detect second traveling-pump pressure near the second port, and a controller configured, with the traveling motor switched in the second speed, to automatically shift down the traveling motor from the second speed to the first speed, when a differential pressure between the first traveling-pump pressure and the second traveling-pump is equal to or more than a deceleration threshold.

    WORKING MACHINE
    5.
    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

    Applicant: KUBOTA CORPORATION

    Inventor： Yuji FUKUDA ,  Ryota HAMAMOTO ,  Jun TOMITA ,  Daiki ABE

    IPC: E02F9/22

    Abstract: 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
    6.
    发明申请
    WORKING MACHINE 有权

    公开(公告)号：US20210123215A1

    公开(公告)日：2021-04-29

    申请号：US17076361

    申请日：2020-10-21

    Applicant: KUBOTA CORPORATION

    Inventor： Yuji FUKUDA ,  Ryota HAMAMOTO ,  Jun TOMITA

    IPC: E02F9/22 ,  E02F9/02 ,  F16H61/16 ,  F16H59/02 ,  F16H61/4035

    Abstract: A working machine includes a machine body, a prime mover, a traveling device mounted on the machine body, a traveling motor to provide a power to the traveling device and to switch between a first speed and a second speed higher than the first speed, a traveling pump to be driven by the prime mover and to supply operation fluid to the traveling motor, and a controller device including an automatic shifter to automatically shift the traveling motor to the first speed or to the second speed, a timer to count an elapsed time from the automatically shifting, and a shift prohibitor to prohibit the automatically shifting by the automatic shifter when the elapsed time counted by the timer is less than a threshold.

    HYDRAULIC SYSTEM FOR WORKING MACHINE
    8.
    发明申请
    HYDRAULIC SYSTEM FOR WORKING MACHINE 有权

    公开(公告)号：US20230092677A1

    公开(公告)日：2023-03-23

    申请号：US17840680

    申请日：2022-06-15

    Applicant: KUBOTA CORPORATION

    Inventor： Yuji FUKUDA ,  Ryota HAMAMOTO ,  Jun TOMITA ,  Yuya KONISHI

    IPC: E02F9/22

    Abstract: In a hydraulic system for a working machine, a controller is configured or programmed to increase an output-port pressure of one activation valve for one hydraulic device and an output-port pressure of another activation valve for another hydraulic device to a normal pressure higher than a preloading pressure from a state where the output-port pressure of the one activation valve is equal to the preloading pressure and the output-port pressure of the other activation valve is lower than the preloading pressure, by causing the output-port pressure of the one activation valve to be lower than the preloading pressure and increasing the output-port pressure of the other activation valve to the normal pressure.

    HYDRAULIC SYSTEM FOR WORKING MACHINE AND HYDRAULIC CONTROL METHOD FOR WORKING MACHINE
    9.
    发明申请
    HYDRAULIC SYSTEM FOR WORKING MACHINE AND HYDRAULIC CONTROL METHOD FOR WORKING MACHINE 审中-公开

    公开(公告)号：US20200048868A1

    公开(公告)日：2020-02-13

    申请号：US16432042

    申请日：2019-06-05

    Applicant: KUBOTA CORPORATION

    Inventor： Ryuki NISHIMOTO ,  Yuji FUKUDA ,  Jun TOMITA

    IPC: E02F9/22 ,  F15B11/10 ,  F15B13/04 ,  F15B13/042

    Abstract: A hydraulic system includes a control device to reduce a first movement speed to be lower than a second movement speed, the first movement speed being a speed at which a spool of a first control valve moves from a first supply position to a first stop position under a state where a second control valve is in the second supply position, the second movement speed being a speed at which the spool moves from the first supply position to the first stop position under a state where the second control valve is in the second stop position. The first supply position allows operation fluid to be supplied to a hydraulic actuator. The first stop position prevents the operation fluid from being supplied to the hydraulic actuator. The second stop position prevents the operation fluid from being supplied to a first fluid tube coupling a hydraulic pump to the hydraulic actuator.

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