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

    公开(公告)号：US20230049370A1

    公开(公告)日：2023-02-16

    申请号：US17841716

    申请日：2022-06-16

    Applicant: KUBOTA CORPORATION

    Inventor： Yuji FUKUDA ,  Kazuyoshi ARII ,  Toshihiko TAKEMURA

    IPC: E02F9/22 ,  F15B11/17 ,  F15B13/02

    Abstract: A hydraulic system for a working vehicle includes a first hydraulic pump to deliver pilot fluid to a control valve for a hydraulic actuator whose highest load pressure acts on a first fluid passage, and a second hydraulic pump to deliver hydraulic fluid whose pressure acts on a second fluid passage. A hydraulic controller is operable to control a load-sensing (LS) differential pressure between the highest load pressure and a delivery pressure of the hydraulic fluid from the second hydraulic pump. A third fluid passage to which the second hydraulic pump delivers the hydraulic fluid branches to a fourth fluid passage for flow of the pilot fluid. A solenoid valve is operable to change a pilot pressure of the pilot fluid for the hydraulic controller, and a controller is configured or programmed to control the solenoid valve to adjust the pilot pressure to change the LS differential pressure.

    HYDRAULIC SYSTEM AND WORK MACHINE
    3.
    发明申请
    HYDRAULIC SYSTEM AND WORK MACHINE 有权
    液压系统及作业机械

    公开(公告)号：US20160304071A1

    公开(公告)日：2016-10-20

    申请号：US15194574

    申请日：2016-06-28

    Applicant: KUBOTA CORPORATION

    Inventor： Yuji FUKUDA ,  Kazuyoshi ARII

    IPC: B60T11/28 ,  E02F9/22 ,  B60T1/12

    CPC classification number: B60T11/28 ,  A01B1/00 ,  B60K17/10 ,  B60T1/12 ,  E02F3/3414 ,  E02F9/2083 ,  E02F9/22 ,  E02F9/226 ,  E02F9/2267 ,  E02F9/2278 ,  E02F9/2292 ,  E02F9/2296 ,  F16D1/00 ,  F16H61/40 ,  F16H61/44

    Abstract: A hydraulic system includes a motor. A brake is to be actuated by an operation fluid to brake the motor when a hydraulic pressure is relieved and to release the braking when the hydraulic pressure is applied. A switch valve is to be switched to a first position and to a second position, the first position being provided for relieving the hydraulic pressure from the brake, the second position being provided for applying the hydraulic pressure to the brake. A first fluid tube is to connect the switch valve and the brake. A second fluid tube is connected to the first fluid tube at a connecting portion and communicated with a tank A first throttle is disposed on the second fluid tube. A second throttle is disposed on the first fluid tube and on an upstream side between the connecting portion and the switch valve.

    Abstract translation: 液压系统包括马达。 当液压被释放时，制动器由操作流体致动以制动马达，并且当施加液压时释放制动。 切换阀被切换到第一位置和第二位置，第一位置被设置用于从制动器释放液压，第二位置用于将液压施加到制动器。 第一个流体管是连接开关阀和制动器。 第二流体管在连接部分处连接到第一流体管并与罐A连通。第一流体管设置在第二流体管上。 第二节流阀设置在第一流体管上并且在连接部分和开关阀之间的上游侧。

    HYDRAULIC SYSTEM OF WORK MACHINE AND WORK MACHINE
    4.
    发明申请
    HYDRAULIC SYSTEM OF WORK MACHINE AND WORK MACHINE 有权

    公开(公告)号：US20210102626A1

    公开(公告)日：2021-04-08

    申请号：US17124492

    申请日：2020-12-17

    Applicant: Kubota Corporation

    Inventor： Yuji FUKUDA ,  Kazuyoshi ARII ,  Ryohei SUMIYOSHI

    IPC: F16H61/4035 ,  F16H61/44 ,  F15B11/20 ,  E02F9/22

    Abstract: A hydraulic system of a work machine includes a first hydraulic device to operate in a first operation mode while pressure of hydraulic oil supplied from a hydraulic pump via a first oil passage is equal to or higher than a first pressure threshold. The hydraulic oil in the first oil passage is to be discharged via a second oil passage. A pilot check valve is provided in the second oil passage and has a pilot port to receive a pilot pressure of the hydraulic oil. The pilot check valve is closed to stop discharging the hydraulic oil in the first oil passage through the second oil passage while the pilot pressure is lower than the fourth pressure threshold. The pilot check valve is opened while the pilot pressure is higher than or equal to the fourth pressure threshold. The first hydraulic device is a ride control device.

    HYDRAULIC SYSTEM OF WORK MACHINE AND WORK MACHINE
    6.
    发明申请
    HYDRAULIC SYSTEM OF WORK MACHINE AND WORK MACHINE 审中-公开

    公开(公告)号：US20200224764A1

    公开(公告)日：2020-07-16

    申请号：US16833689

    申请日：2020-03-30

    Applicant: Kubota Corporation

    Inventor： Yuji FUKUDA ,  Kazuyoshi ARII ,  Ryohei SUMIYOSHI

    IPC: F16H61/4035 ,  F16H61/44 ,  F15B11/20 ,  E02F9/22

    Abstract: A hydraulic system of a work machine includes a first hydraulic device to operate in a first operation mode while pressure of hydraulic oil supplied from a hydraulic pump via a first oil passage is equal to or higher than a first pressure threshold. The hydraulic oil in the first oil passage is to be discharged via a second oil passage. A pilot check valve is provided in the second oil passage and has a pilot port to receive a pilot pressure of the hydraulic oil. The pilot check valve is closed to stop discharging the hydraulic oil in the first oil passage through the second oil passage while the pilot pressure is lower than the fourth pressure threshold. The pilot check valve is opened while the pilot pressure is higher than or equal to the second pressure threshold. The first hydraulic device is an operation control valve.

    HYDRAULIC SYSTEM FOR WORK MACHINE
    7.
    发明申请
    HYDRAULIC SYSTEM FOR WORK MACHINE 有权

    公开(公告)号：US20220341128A1

    公开(公告)日：2022-10-27

    申请号：US17860279

    申请日：2022-07-08

    Applicant: KUBOTA CORPORATION

    Inventor： Yuji FUKUDA ,  Kazuyoshi ARII

    IPC: E02F9/20 ,  F04B1/26 ,  E02F9/22

    Abstract: A hydraulic system for a work machine, which includes a first hydraulic pump to deliver operation fluid, a second hydraulic pump to deliver pilot fluid, a first hydraulic actuator configured to control flow rate of the operation fluid based on the pilot pressure applied to the pressure receivers, a manual operator configured to operate the first hydraulic actuator, having an operation lever to move toward both directions, operation valves to change pressure of the pilot fluid in accordance with movement of the operation lever, and a discharge fluid tube to drain the pilot fluid from the operation valves. The hydraulic system includes an actuating valve in the discharge fluid tube and configured to reduce pressure of the pilot fluid in the discharge fluid tube.

    HYDRAULIC SYSTEM FOR WORK MACHINE
    8.
    发明申请
    HYDRAULIC SYSTEM FOR WORK MACHINE 审中-公开

    公开(公告)号：US20190195207A1

    公开(公告)日：2019-06-27

    申请号：US16288944

    申请日：2019-02-28

    Applicant: KUBOTA CORPORATION

    Inventor： Yuji FUKUDA ,  Kazuyoshi ARII ,  Ryohei SUMIYOSHI

    IPC: F04B1/26 ,  E02F9/22 ,  E02F9/20

    CPC classification number: F04B1/26 ,  E02F3/3414 ,  E02F9/166 ,  E02F9/2025 ,  E02F9/2285 ,  E02F9/2292

    Abstract: 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.

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