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    WORK VEHICLE
    1.
    发明公开
    WORK VEHICLE 审中-公开

    公开(公告)号：EP3425211A1

    公开(公告)日：2019-01-09

    申请号：EP16917684.9

    申请日：2016-09-28

    申请人： KCM Corporation

    发明人： NAKAMURA, Atsushi ,  SHIMAZAKI, Koji

    IPC分类号： F15B11/02 ,  E02F9/22 ,  F02D29/00 ,  F02D45/00

    摘要： A work vehicle includes: a main hydraulic pump that supplies pressure oil to a hydraulic cylinder; an accessory pump that supplies pressure oil to an auxiliary machine; and a confluence switching valve that merges pressure oil of the accessory pump with pressure oil of the main hydraulic pump. The work vehicle is provided with a control device that, in case atmospheric pressure or air density of outside air is lower than a predetermined value, executes confluence limitation control of reducing a confluence flow rate at the confluence switching valve compared to the time in case the atmospheric pressure or the air density of the outside air is higher than the predetermined value, and canceling the confluence limitation control in case rotation speed of an engine becomes higher compared to a predetermined rotation speed value during the confluence limitation control, and the rotation speed value is higher as the atmospheric pressure or the air density of the outside air is lower.

    WHEEL LOADER
    2.
    发明公开
    WHEEL LOADER 审中-公开

    公开(公告)号：EP3492663A1

    公开(公告)日：2019-06-05

    申请号：EP17922073.6

    申请日：2017-09-29

    申请人： KCM Corporation

    发明人： HYODO, Koji ,  AOKI, Isamu ,  TANAKA, Tetsuji ,  SHIMAZAKI, Koji ,  SUZUKI, Hironao

    IPC分类号： E02F9/22 ,  E02F9/20

    摘要： A wheel loader configured to reduce a sudden change in vehicle speed caused by an erroneous determination of a raising operation of a lift arm is provided.
    A wheel loader 1 includes an engine 3, a variable displacement type HST pump 41, a variable displacement type HST motor 42 coupled to the HST pump 41 in a closed circuit, a hydraulic pump for working device 43, a forward/reverse selector switch 62 for switching a forward movement and a backward movement of a vehicle body, a depression amount sensor 610 that detects a depression amount of an accelerator pedal 61, a pressure sensor 73 that detects a discharge pressure Pa of the hydraulic pump for working device 43, and a controller 5. The controller 5 determines whether a specific condition to identify an upward movement of a lift arm 21 during a forward travel of the vehicle body based on a forward/reverse switching signal, the depression amount of the accelerator pedal 61, and the discharge pressure Pa detected by the pressure sensor 73. When the specific condition is satisfied, the controller 5 controls a displacement volume of the HST motor 42 according to an increase of the discharge pressure Pa, so as to limit the vehicle speed.