Invention Grant
- Patent Title: Wheel loader
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Application No.: US16328857Application Date: 2017-09-29
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Publication No.: US11242672B2Publication Date: 2022-02-08
- Inventor: Koji Hyodo , Isamu Aoki , Tetsuji Tanaka , Koji Shimazaki , Hironao Suzuki
- Applicant: Hitachi Construction Machinery Co., Ltd.
- Applicant Address: JP Tokyo
- Assignee: Hitachi Construction Machinery Co., Ltd.
- Current Assignee: Hitachi Construction Machinery Co., Ltd.
- Current Assignee Address: JP Tokyo
- Agency: Crowell & Moring LLP
- International Application: PCT/JP2017/035592 WO 20170929
- International Announcement: WO2019/064527 WO 20190404
- Main IPC: E02F9/22
- IPC: E02F9/22 ; E02F9/20

Abstract:
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.
Public/Granted literature
- US20210355657A1 Wheel Loader Public/Granted day:2021-11-18
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