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

    公开(公告)号：US20230358022A1

    公开(公告)日：2023-11-09

    申请号：US18025707

    申请日：2021-12-08

    Applicant: Hitachi Construction Machinery Co., Ltd.

    Inventor： Kento KUMAGAI ,  Shinya IMURA ,  Yasutaka TSURUGA ,  Takaaki CHIBA ,  Hiroaki AMANO ,  Shinji NISHIKAWA ,  Akihiro NARAZAKI ,  Genroku SUGIYAMA ,  Shinjiro YAMAMOTO

    IPC: E02F9/22

    CPC classification number: E02F9/2228

    Abstract: The invention of the present application intends to provide a work machine that can ensure high operability by preventing abrupt actuation of an actuator and a shock to a machine body by use of a bleed-off function at the time of starting of the actuator and that can improve the energy-saving performance by reducing a bleed-off flow rate after the starting of the actuator. For this purpose, a controller opens a bleed-off valve at a timing at which an operation device is being operated and before a flow rate of a hydraulic pump starts increasing, and closes the bleed-off valve at a timing at which the operation device is being operated and after the flow rate of the hydraulic pump has started increasing.

    Work Machine
    3.
    发明申请
    Work Machine 有权

    公开(公告)号：US20220298752A1

    公开(公告)日：2022-09-22

    申请号：US17636094

    申请日：2020-10-21

    Applicant: Hitachi Construction Machinery Co., Ltd.

    Inventor： Kento KUMAGAI ,  Shinya IMURA ,  Genroku SUGIYAMA ,  Katsuaki KODAKA ,  Yasutaka TSURUGA ,  Takaaki CHIBA

    IPC: E02F9/22 ,  F15B13/044

    Abstract: There is provided a work machine which can improve accuracy of control of an actuator when a pressure difference between a hydraulic pump and the actuator is large and the demanded flow rate of the actuator is small. An auxiliary flow rate controller is configured such that an opening area of a main valve changes between a maximum opening area and zero according to the opening area of a pilot variable restrictor when the opening area of the pilot variable restrictor is equal to or more than a predetermined opening area and that the opening area of the main valve is zero irrespective of the opening area of the pilot variable restrictor when the opening area of the pilot variable restrictor is less than the predetermined opening area.

    Work Machine
    4.
    发明申请
    Work Machine 有权

    公开(公告)号：US20220333348A1

    公开(公告)日：2022-10-20

    申请号：US17641038

    申请日：2021-03-18

    Applicant: Hitachi Construction Machinery Co., Ltd.

    Inventor： Kento KUMAGAI ,  Shinya IMURA ,  Yasutaka TSURUGA ,  Takaaki CHIBA ,  Hiroaki AMANO ,  Shinji NISHIKAWA ,  Akihiro NARAZAKI ,  Genroku SUGIYAMA ,  Shinjiro YAMAMOTO

    IPC: E02F9/22 ,  E02F9/20 ,  F15B13/02

    Abstract: Provided is a work machine which can increase the operation speed of an actuator by a regeneration function while securing the position control accuracy of the actuator. A controller is configured to calculate a regeneration flow rate on the basis of an input amount of an operation lever and a target actuator flow rate, subtract the regeneration flow rate from the target actuator flow rate to calculate a target actuator supply flow rate, calculate a target flow rate control valve opening amount on the basis of the target actuator supply flow rate, calculate a target pump flow rate that is equal to or higher than a total target actuator supply flow rate, control a selector valve on the basis of the input amount of the operation lever, control a flow rate control valve according to the target flow rate control valve opening amount, and control a hydraulic pump according to the target pump flow rate.

    WORK MACHINE
    5.
    发明申请
    WORK MACHINE 有权

    公开(公告)号：US20210002868A1

    公开(公告)日：2021-01-07

    申请号：US16979338

    申请日：2019-06-21

    Applicant: HITACHI CONSTRUCTION MACHINERY CO., LTD.

    Inventor： Kento KUMAGAI ,  Shinya IMURA ,  Genroku SUGIYAMA ,  Katsuaki KODAKA ,  Yasutaka TSURUGA

    IPC: E02F9/22

    Abstract: To provide a work machine that makes it possible to drive actuators faster and more accurately by supplying flows to the actuators accurately at target rates without depending on load variations in a case where the machine body is controlled automatically by command inputs of a controller, while high operability is ensured for manual operation by an operator. In a case where a machine control function is cancelled via a machine control switch, a controller cancels limitation of the flow rate of a hydraulic fluid supplied to a plurality of directional control valves, the limitation being performed by the auxiliary flow rate control devices, and in a case where the machine control function is selected via the machine control switch, the controller causes the auxiliary flow rate control devices to limit the flow rate of the hydraulic fluid supplied to the plurality of directional control valves.

    Work Machine
    6.
    发明申请
    Work Machine 有权

    公开(公告)号：US20220333352A1

    公开(公告)日：2022-10-20

    申请号：US17640947

    申请日：2020-11-02

    Applicant: Hitachi Construction Machinery Co., Ltd.

    Inventor： Kento KUMAGAI ,  Shinya IMURA ,  Yasutaka TSURUGA ,  Takaaki CHIBA ,  Hiroaki AMANO ,  Shinji NISHIKAWA ,  Akihiro NARAZAKI ,  Genroku SUGIYAMA

    IPC: E02F9/22 ,  E02F9/20

    Abstract: Provided is a work machine which can achieve both of excellent operability when an operator manually operates a machine body or a work device and an accuracy of control of the machine body or the work device when a controller performs automatic control. The controller is configured to, in a case where the automatic control function selector switch gives an instruction to disable the automatic control function, adjust an opening amount of a bleed-off valve to a maximum opening amount or an opening amount corresponding to input amounts of control levers, and in a case where the automatic control function selector switch gives the instruction to enable the automatic control function, adjust the opening amount of the bleed-off valve, in at least part of an operation region of the control levers, so as to be smaller than the opening amount with the instruction to disable the automatic control function being given.

    Work Machine
    7.
    发明申请
    Work Machine 有权

    公开(公告)号：US20210254309A1

    公开(公告)日：2021-08-19

    申请号：US17252129

    申请日：2019-03-28

    Applicant: Hitachi Construction Machinery Co., Ltd.

    Inventor： Kento KUMAGAI ,  Shinya IMURA ,  Genroku SUGIYAMA ,  Katsuaki KODAKA ,  Yasutaka TSURUGA ,  Takaaki CHIBA

    IPC: E02F9/22

    Abstract: A work machine capable of driving each actuator more speedily and more accurately by ensuring high operability in a case of operator's manual operation, while accurately supplying a hydraulic fluid at a target flow rate to the actuator without depending on a load fluctuation in a case of automatic control over a machine body in response to a command input from a controller is provided.
    The controller controls a plurality of auxiliary flow controllers in such a manner that supply flow rates to a plurality of directional control valves from hydraulic pumps fluctuate in response to load fluctuations of a plurality of hydraulic actuators in a case in which an instruction on invalidation of an area limiting control function is issued, and controls the plurality of auxiliary flow controllers in such a manner that the supply flow rates to the plurality of directional control valves from the hydraulic pumps do not fluctuate in response to the load fluctuations of the plurality of hydraulic actuators in a case in which an instruction on validation of the area limiting control function is issued.

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