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    ELECTRICALLY DRIVEN CONSTRUCTION MACHINE DRIVING SYSTEM
    1.
    发明公开
    ELECTRICALLY DRIVEN CONSTRUCTION MACHINE DRIVING SYSTEM 审中-公开

    公开(公告)号：US20240360650A1

    公开(公告)日：2024-10-31

    申请号：US18689481

    申请日：2022-12-13

    Applicant: Hitachi Construction Machinery Tierra Co., Ltd.

    Inventor： Kazushige MORI ,  Kiwamu TAKAHASHI ,  Ryoya INOUE ,  Yuki KOTO

    IPC: E02F9/20

    CPC classification number: E02F9/2095 ,  E02F9/207 ,  E02F9/2091

    Abstract: In an electrically driven construction machine, decrease in the remaining electric power storage amount of an electric power storage device is reduced when a transition to auto idle control takes place in case where the remaining electric power storage amount is small, and the duration over which the remaining electric power storage amount of the electric power storage device lasts is lengthened. Accordingly, a controller 31 controls the rotation speed of an electric motor 1 such that the rotation speed of the electric motor 1 is lowered from a predetermined rotation speed to an idle rotation speed Ni when none of a plurality of operation devices 20, 21, 22, 23a, 23b, and 24 is manipulated and a predetermined time duration TD has elapsed. In addition, when the remaining electric power storage amount of an electric power storage device 33 is equal to or smaller than a first threshold Ea, the controller 31 sets the predetermined time duration TD shorter than when the remaining electric power storage amount is greater than the first threshold Ea.

    Hydraulic Drive System for Construction Machine
    2.
    发明申请
    Hydraulic Drive System for Construction Machine 审中-公开

    公开(公告)号：US20200340206A1

    公开(公告)日：2020-10-29

    申请号：US16082447

    申请日：2017-03-24

    Applicant: Hitachi Construction Machinery Tierra Co., Ltd.

    Inventor： Kazushige MORI ,  Hajime YOSHIDA ,  Yoshifumi TAKEBAYASHI ,  Natsuki NAKAMURA ,  Daisuke OKA

    IPC: E02F3/84 ,  E02F9/22

    Abstract: A hydraulic drive system for a hydraulic excavator that enables leveling work and a jack-up operation by a blade in a float state, that can prevent a body from falling even when an operator has falsely operated the hydraulic excavator during the jack-up operation by the blade, and that yet can perform favorable leveling work with the blade turned into the float state is provided. A float switch 37, a float valve 38, and a controller 34 are provided, the float valve 38 is changed over to a float position VI upon operating the float switch 37 when the blade is not in a jack-up state, the float valve 38 is changed over from the float position VI to a normal position V when the float valve 38 is in a state of being at the float position VI and an operation lever device 22 has been operated, and the float valve 38 is kept at the normal position V when the float valve 38 is at the normal position V and the float switch 37 has been operated in the jack-up state.

    Hydraulic Drive System of Work Machine
    3.
    发明申请
    Hydraulic Drive System of Work Machine 审中-公开

    公开(公告)号：US20190177953A1

    公开(公告)日：2019-06-13

    申请号：US16326754

    申请日：2017-12-14

    Applicant: Hitachi Construction Machinery Tierra Co., Ltd.

    Inventor： Kiwamu TAKAHASHI ,  Taihei MAEHARA ,  Kazushige MORI ,  Yoshifumi TAKEBAYASHI ,  Natsuki NAKAMURA

    IPC: E02F9/22 ,  F15B11/05

    Abstract: In a hydraulic drive system of a work machine which drives a plurality of actuators using three or more pumps, for an operation not including traveling, a highly efficient combined operation in a front implement and excellent combined operability of a swing and the front implement are enabled, while for an operation including traveling, a highly efficient traveling operation and a highly efficient combined operation of traveling and the front implement are enabled, and a sufficient operation speed of the front implement is achieved. To this end, each of the flow rates of the first, second, and third pumps (101, 201, 301) can be controlled independently by performing the load sensing control, and in a combined operation for driving a boom (511) and an arm (512), ether one of them is driven by the first pump while the other one is driven by the second pump, and the swing is driven by the third pump. In the traveling operation, the maximum capacity of the first and second pumps is switched to the maximum capacity for the traveling operation and driven by an open center circuit. In a combined operation of traveling and the front implement, the front implement is driven by performing the load sensing control using the third pump.

    Small Hydraulic Excavator
    4.
    发明申请
    Small Hydraulic Excavator 审中-公开

    公开(公告)号：US20200165794A1

    公开(公告)日：2020-05-28

    申请号：US16080387

    申请日：2017-02-22

    Applicant: Hitachi Construction Machinery Tierra Co., Ltd.

    Inventor： Yoshifumi TAKEBAYASHI ,  Hajime YOSHIDA ,  Kazushige MORI ,  Natsuki NAKAMURA ,  Taihei MAEHARA

    IPC: E02F3/32 ,  E02F9/18 ,  E02F9/08 ,  E02F9/22 ,  E02F9/16 ,  E02F9/12

    Abstract: To provide a small hydraulic excavator, which even may have an upperstructure formed such that at least its rear end swings within a body width range and having a limited installation space for devices, that allows an accumulator to be disposed and allows the accumulator to be protected from external force generated during work. The present invention relates to a rear small-swing type mini excavator that includes an accumulator 30 accommodating and recovering potential energy and hydraulic energy used by at least one of drives of an undercarriage 1, an upperstructure 2 formed such that its rear end swings within the body width range of the undercarriage 1, and a working device 3. In the rear small-swing type mini excavator, the accumulator 30 is disposed between a valve block 26 and a front longitudinal board 41 of a longitudinal board member included in a main frame 10 along the front longitudinal board 41, and a pipe connected to the accumulator 30 and the valve block 26 is disposed closer to the accumulator 30 and the valve block 26.

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