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

    公开(公告)号：EP4461882A1

    公开(公告)日：2024-11-13

    申请号：EP23780390.3

    申请日：2023-03-27

    Applicant: Hitachi Construction Machinery Co., Ltd.

    Inventor： OKANO, Hajime ,  MURAYAMA, Yuuji ,  YANASE, Yoshitaka

    IPC: E02F9/20 ,  F15B11/00

    Abstract: A plurality of control valves (39A to 39D, 40A to 40D, 41A to 41D, 42A to 42D, 43) is aligned and disposed in the right-and-left direction and in the vertical direction on a first mounting surface (38C) and a second mounting surface (38D). Further, a plurality of control valves (47, 48) is aligned and disposed in the right-and-left direction and in the vertical direction on a first mounting surface (46B) and a second mounting surface (46C) .

    WORK MACHINE
    4.
    发明公开
    WORK MACHINE 审中-公开

    公开(公告)号：EP4459051A1

    公开(公告)日：2024-11-06

    申请号：EP22915895.1

    申请日：2022-12-22

    Applicant: KUBOTA CORPORATION

    Inventor： HORII, Hiroshi

    IPC: E02F9/22 ,  F15B11/00 ,  F15B11/042

    Abstract: Provided is a working machine (1) capable of improving responsiveness of a hydraulic actuator when a predetermined operation is performed.
    The working machine (1) includes a machine body (2), working devices (a working device 4 and a dozer device 7) mounted on the machine body (2), hydraulic actuators (C5, C3, C4, C1) that drive the working devices, control valves (V1, V2, V7, V3, V6) that switch the state of a hydraulic fluid supplied to the hydraulic actuators, operation members (41) that receive operation instructions for the hydraulic actuators, and a controller (U1) that controls actuation of the control valves in response to operations performed on the operation members (41). The controller (U1) is capable of performing second control for controlling the actuation of each of the control valves on the basis of the amount of an operation performed on a corresponding one of the operation members (41) and the correspondence between a preset operation amount for the operation member (41) and the actuation amount of the control valve and first control for controlling, in accordance with the amount of the operation performed on the operation member (41), the actuation of the control valve such that the flow rate of the hydraulic fluid supplied from the control valve to the corresponding hydraulic actuator increases to be greater than that in the second control. The controller (U1) performs the first control when the operation performed on the operation member (41) is in a predetermined operation state.

    WORK MACHINE
    10.
    发明公开
    WORK MACHINE 审中-公开

    公开(公告)号：EP4191073A1

    公开(公告)日：2023-06-07

    申请号：EP21910026.0

    申请日：2021-11-11

    Applicant: Hitachi Construction Machinery Co., Ltd.

    Inventor： AKITA, Tarou ,  SHIRAKAWA, Yoshihiro ,  OGURA, Kohei ,  KANEHAMA, Mitsuhiko

    IPC: F15B11/00 ,  E02F9/22 ,  F15B11/08 ,  F15B11/16 ,  F15B21/0427

    Abstract: A work machine includes a flow control valve that controls a flow rate of a hydraulic fluid supplied to a hydraulic actuator, a center bypass line that introduces the hydraulic fluid from a pump through a center bypass passage section of the flow control valve into the tank, a bypass cutoff valve that controls an opening of the center bypass line, a solenoid proportional valve that generates a pilot pressure for controlling the bypass cutoff valve, a pilot valve that generates a pilot pressure for controlling the flow control valve on the basis of an amount of operation of an operation device, and a controller that controls the solenoid proportional valve on the basis of the amount of operation. The controller controls the solenoid proportional valve to reduce an opening area of the bypass cutoff valve according to an increase in the amount of operation in a case the amount of operation is less than a predetermined amount of operation, and controls the solenoid proportional valve to make the opening area of the bypass cutoff valve larger than the minimum opening area in a case the amount of operation is a maximum amount of operation.

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