Title:
ホイールローダ
Document Type and Number:
Japanese Patent JP6683883
Kind Code:
B2
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.
Inventors:
Koji Hyodo
Isamu Aoki
Tetsuji Tanaka
Island Saki Koji
Hironao Suzuki
Isamu Aoki
Tetsuji Tanaka
Island Saki Koji
Hironao Suzuki
Application Number:
JP2019500607A
Publication Date:
April 22, 2020
Filing Date:
September 29, 2017
Export Citation:
Assignee:
Hitachi Construction Machinery Co., Ltd.
International Classes:
E02F9/22; E02F9/20; F16H61/47
Domestic Patent References:
| JP2010025179A |
Foreign References:
| WO2009019974A1 | ||||
| WO2013145342A1 |
Attorney, Agent or Firm:
Patent Business Corporation Takewa International Patent Office