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    HYDRAULIC EXCAVATOR DRIVE SYSTEM
    3.
    发明申请
    HYDRAULIC EXCAVATOR DRIVE SYSTEM 有权

    公开(公告)号：US20210372077A1

    公开(公告)日：2021-12-02

    申请号：US17282543

    申请日：2019-09-04

    申请人： KAWASAKI JUKOGYO KABUSHIKI KAISHA

    发明人： Akihiro KONDO ,  Makoto ITO ,  Seiji AOKI ,  Moriyuki SAKAMOTO ,  Yoji YUDATE

    IPC分类号： E02F3/42 ,  E02F9/22 ,  E02F9/12 ,  F15B11/17 ,  F15B15/20

    摘要： A hydraulic excavator drive system includes: a first pump that supplies hydraulic oil to a boom cylinder via a boom control valve, and supplies the hydraulic oil to a bucket cylinder via a first bucket control valve; a second pump that supplies the hydraulic oil to an arm cylinder via an arm control valve; a third pump that supplies the hydraulic oil to a slewing motor via a slewing control valve, and supplies the hydraulic oil to the bucket cylinder via a second bucket control valve; and a controller that moves one of the first bucket control valve and the second bucket control valve when a bucket excavating operation or a bucket dumping operation is performed concurrently with another operation, and moves both the first bucket control valve and the second bucket control valve when a bucket excavating operation is performed alone.

    CONTROLLER UNIT AND LIQUID-PRESSURE DRIVING SYSTEM
    4.
    发明申请
    CONTROLLER UNIT AND LIQUID-PRESSURE DRIVING SYSTEM 审中-公开

    公开(公告)号：US20190285093A1

    公开(公告)日：2019-09-19

    申请号：US16318937

    申请日：2017-07-25

    申请人： KAWASAKI JUKOGYO KABUSHIKI KAISHA

    发明人： Hideyasu MURAOKA ,  Yoji YUDATE ,  Kazuya IWABE

    IPC分类号： F15B11/04 ,  E02F9/22 ,  G01C19/06

    摘要： A controller unit is included in a liquid-pressure driving system for use in a working machine configured to supply an operating liquid to an actuator to move a structural body by the actuator. The controller unit includes: a gyro sensor configured to output a signal corresponding to an operation velocity of the structural body; and a controller configured to control a flow rate of the operating liquid supplied to the actuator, based on the signal output from the gyro sensor and corresponding to the operation velocity of the structural body, wherein: the controller is attached to the structural body; and the gyro sensor is incorporated in the controller.

    HYDRAULIC DRIVE SYSTEM OF CONSTRUCTION MACHINE
    5.
    发明申请
    HYDRAULIC DRIVE SYSTEM OF CONSTRUCTION MACHINE 审中-公开

    公开(公告)号：US20200277755A1

    公开(公告)日：2020-09-03

    申请号：US16647840

    申请日：2018-09-11

    申请人： KAWASAKI JUKOGYO KABUSHIKI KAISHA

    发明人： Akihiro KONDO ,  Yoji YUDATE ,  Takehisa KATO

    IPC分类号： E02F9/22

    摘要： A hydraulic drive system of a construction machine includes: a boom control valve connected to a boom cylinder by a boom raising supply line and a boom lowering supply line; a pump that sucks hydraulic oil through a suction line, and delivers the hydraulic oil through a delivery line; a regenerative valve that brings the boom raising supply line and the suction line into communication with each other through a regenerative line when a boom lowering operation is performed; and a controller that controls an accumulator switching valve. The controller: switches the accumulator switching valve to a pressure accumulation position when a pressure accumulation condition is satisfied; switches the accumulator switching valve to a pressure release position when a pressure release condition is satisfied; and switches the accumulator switching valve to a neutral position when neither the pressure accumulation condition nor the pressure release condition is satisfied.