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    Construction Machine
    1.
    发明公开
    Construction Machine 审中-公开

    公开(公告)号：US20240125091A1

    公开(公告)日：2024-04-18

    申请号：US18277842

    申请日：2021-12-16

    Applicant: Hitachi Construction Machinery Co., Ltd.

    Inventor： Shinji NISHIKAWA ,  Ryohei YAMASHITA ,  Akihiro NARAZAKI

    IPC: E02F9/20 ,  E02F9/24 ,  E02F9/26

    CPC classification number: E02F9/205 ,  E02F9/24 ,  E02F9/26 ,  E02F9/2285

    Abstract: A machine controller that controls an action of the construction machine; an external operation controller that controls unmanned operation that does not require operation by an operator riding in an operation room, by generating a control signal according to an operation signal received from an outside via a communication terminal, and sending the control signal to the machine controller; an approach permission signaling light that signals permission for a worker to approach the construction machine; and an action request signaling light that signals a request for riding in the operation room and performing a particular action to a nearby worker are provided, and the external operation controller is configured to control the approach permission signaling light to be turned on when it is decided that approach of the worker to the construction machine can be tolerated according to information collected by the machine controller, and also control the action request signaling light to be turned on when it is decided that it is necessary to request a nearby worker to take a particular action. Thereby, it is possible to succinctly notify nearby workers and a manager of a machine-body action state, and to realize both the safety and work efficiency of the workers near the machine body and the manager.

    Construction Machine
    2.
    发明申请
    Construction Machine 有权

    公开(公告)号：US20210332564A1

    公开(公告)日：2021-10-28

    申请号：US16489437

    申请日：2018-03-15

    Applicant: Hitachi Construction Machinery Co., Ltd.

    Inventor： Ryohei YAMASHITA ,  Kazushige MORI ,  Shinya IMURA

    IPC: E02F9/22 ,  F15B15/20

    Abstract: Provided is a construction machine capable of driving each hydraulic actuator at a suitable speed while suppressing delivery flow rate of a hydraulic pump, both at a single operation time of driving each hydraulic actuator respectively singularly and at a combined operation time of simultaneously driving a plurality of hydraulic actuators. A controller is configure to compute a first required pump flow rate for each of operation amounts of a plurality of operation devices, compute a second required pump flow rate greater than the first required pump flow rate for the same operation amount for each of the operation amounts of the plurality of operation devices, select as a final required pump flow rate either smaller one of a sum total value of the first required pump flow rates computed for the operation amounts of the plurality of operation devices and a maximum value of the second required pump flow rates computed for the operation amounts of the plurality of operation devices, and control a regulator in such a manner that the delivery flow rate of the hydraulic pump and the final required pump flow rate will be equal.

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

    公开(公告)号：US20240052600A1

    公开(公告)日：2024-02-15

    申请号：US18278671

    申请日：2021-12-16

    Applicant: HITACHI CONSTRUCTION MACHINERY CO., LTD.

    Inventor： Shinji NISHIKAWA ,  Ryohei YAMASHITA ,  Akihiro NARAZAKI

    IPC: E02F9/26 ,  E02F9/24 ,  E02F9/20

    CPC classification number: E02F9/26 ,  E02F9/24 ,  E02F9/205

    Abstract: Provided are a machine controller that controls operation of the hydraulic excavator, an external operation controller that executes control of unattended operation that does not require operation through riding of an operator in a cab, by generating a control signal according to an operation signal received from the external through a communication terminal and sending out the control signal to the machine controller, an operation indicator light that indicates that the unattended operation of the hydraulic excavator is normally in operation, and an approach permission indicator light that indicates permission of approach of a worker to the hydraulic excavator. The external operation controller, according to information collected into the machine controller, turns on the operation indicator light when determining that the hydraulic excavator is normally operating, and turns on the approach permission indicator light when determining that approach of the worker to the hydraulic excavator is permissible.

    Construction Machine
    6.
    发明申请
    Construction Machine 有权

    公开(公告)号：US20210324602A1

    公开(公告)日：2021-10-21

    申请号：US16490982

    申请日：2018-03-19

    Applicant: Hitachi Construction Machinery Co., Ltd.

    Inventor： Ryohei YAMASHITA ,  Kazushige MORI ,  Shinya IMURA

    IPC: E02F3/43 ,  E02F9/22

    Abstract: To provide a construction machine that can improve the energy efficiency in a leveling operation in which an arm crowding operation and a boom raising operation are performed simultaneously. A controller (30) controls a first regulator (60a) according to the maximum value among target displacement volume (Qa1) of a first hydraulic pump (1) that is based on a boom raising operation amount (Pi1), and target displacement volume (Qa2) of the first hydraulic pump (1) that is based on an arm crowding operation amount (Pi2) of an arm operation device (18) if the boom raising operation amount (Pi1) of a boom operation device (17) is smaller than a predetermined operation amount, or if a delivery pressure (P2) of a second hydraulic pump (2) is equal to or higher than a predetermined pressure, and controls the first regulator (60a) according only to the target displacement volume (Qa1) of the first hydraulic pump (1) that is based on the boom raising operation amount (Pi1) if the boom raising operation amount (Pi1) is equal to or larger than the predetermined operation amount, and the delivery pressure (P2) of the second hydraulic pump (2) is lower than the predetermined pressure.

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