WHEEL LOADER

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 pum...

Ausführliche Beschreibung

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Bibliographische Detailangaben
Hauptverfasser: TANAKA, Tetsuji, AOKI, Isamu, SUZUKI, Hironao, SHIMAZAKI, Koji, HYODO, Koji
Format: Patent
Sprache:eng ; fre ; ger
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Beschreibung
Zusammenfassung: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.