Hitachi Construction Machinery Co., Ltd.

Kouji Shimazaki

Tetsuji Tanaka

Isamu Aoki

Koji Hyodo

Masaki Yoshikawa

Kazuyuki Ito

Keisuke Naitou

Jumpei Kamiya

Takuya Shimomura

Provided is a work vehicle capable of reducing the fuel consumption while maintaining the working efficiency. A wheel loadercomprising a vehicle body controllerA for controlling an engine, wherein the vehicle body controllerA limits an upper limit rotational speed of the enginebased on an accelerator pedal step-on amount α, a brake pedal step-on amount β, a torque converter speed ratio e which is a ratio of a rotational speed of a torque converter, a discharge pressure Pof a loading hydraulic pump, and a stroke amount Sof lift arm cylindersor a stroke amount Sof a bucket cylinder

Work vehicle

Provided is a work machine capable of notifying that maintenance is necessary due to continuation of clogging in a cooling device or decrease in cooling performance. A wheel loaderincluding a radiatorand an oil coolercomprises a controllerA configured to determine a clogging continuation state of the radiatoror the oil cooler. The controllerA determines whether clogging is occurring in the radiatoror the oil coolerbased on outside air temperature AW and cooling water temperature CW or hydraulic oil temperature HW, determines whether the clogging continues based on a clogging occurrence ratio R, Rwhile an engineis operating, and outputs a notification command signal for providing the alarm buzzerand the user management systemwith a command to notify that maintenance is necessary when it is determined that the clogging continues.

Work machine

Provided is a wheel loader capable of moving up a lift arm in a short time during excavation work. A wheel loader comprises a controller configured to control maximum traction force of the wheel loader and input torque of a working device hydraulic pump, and include a specific condition determination section configured to determine whether a specific condition for specifying excavation work is satisfied, an elapsed time measurement section configured to measure an elapsed time from start of the excavation work, and an input torque control section configured to limit the input torque to a first input torque value when the specific condition is satisfied and increase the input torque from the first input torque value when a second set time elapses from the elapse of a first set time.

Wheel loader

A work vehicle is provided. The work vehicle is capable of notifying an operator of a state close to overheating of a temperature of a cooling oil that cools a brake device before the temperature overheats. A controller () in a work vehicle () compares each detection value detected from a brake pressure sensor () and a vehicle speed sensor () to each threshold (V, P, R) predetermined corresponding to each sensor. The controller () outputs a warning command that a temperature of a cooling oil is likely to overheat to a notification device () when a state that at least one detection value is equal to or more than the threshold and when a state that at least one detection value is equal to or more than the threshold continues for a first duration (t) or more.

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Hyogo, Japan

Kouji Shimazaki