Hitachi Construction Machinery Co., Ltd.

Kcm Corporation

Masashi Yamashita

Koji Hyodo

Tetsuji Tanaka

Isamu Aoki

Masaki Nukii

Katsutaka Hara

Keigo Kikuchi

Atsushi Shimazu

Takashi Takeyama

Shoroku Kawahara

Yuki Ahiko

To curb temperature rises in a control device for a supercharger and extend the life of the control device for the supercharger, a work vehicle includes a variable geometry supercharger with variable boost pressure, and a working device driven by pressure oil discharged from a working hydraulic pump, the work vehicle further including: a supercharger control device adapted to control the supercharger; a temperature detection device adapted to detect temperature of the supercharger control device; and a main control device adapted to limit at least one of maximum rotational speed of an engine and maximum vehicle speed of the work vehicle in case the temperature of the supercharger control device is above a predetermined temperature as compared to case the temperature of the supercharger control device is below the predetermined temperature.

Wheel loader

Provide is a loading vehicle capable of quickly operating an object handling device in the upward direction while traveling forward. A wheel loadercomprises an engine, an HST pump, an HST motor, a forward/reverse changeover switch, a step-on amount sensor, a pressure sensor, and a controller. In a case where a specific condition for specifying lifting operation of a lift armduring forward traveling of the vehicle body is satisfied, the controllerincreases maximum rotational speed of the engine to a predetermined value Nmaxwhich is greater than maximum engine rotational speed Nmaxduring traveling on the flat ground, and limit maximum vehicle speed to a predetermined value Vmaxwhich is smaller than maximum vehicle speed Vmaxprior to the lifting operation of the lift arm

Loading vehicle

An exhaust system of a work machine is equipped with a first exhaust system, a second exhaust system, and a third exhaust system. The first exhaust system and the third exhaust system are arranged to be in parallel with respective one ends directed in the same direction. In a plan view, the second exhaust system is arranged with the other end side directed in the same direction as the one end sides of the first exhaust system and the third exhaust system to be in parallel with the first exhaust system and the third exhaust system between the first exhaust system and the third exhaust system and, in a side view, is arranged above the first exhaust system and the third exhaust system.

Work machine

A work vehicle includes: a hydraulic pump driven by an engine; a rotational speed detection unit that detects an actual rotational speed of the engine; an exhaust gas purification device that purifies nitrogen oxide in exhaust gas discharged from the engine using a reducing agent solution stored in a reducing agent tank; a torque control unit that decreases output torque of the engine according to decrease of a detected remaining amount of the reducing agent solution; and a storage device that stores a threshold value not less than an engine rotational speed at which the hydraulic pump starts discharge, wherein when the actual rotational speed of the engine is not more than the threshold value, the torque control unit does not decrease the output torque of the engine regardless of the remaining amount of the reducing agent solution detected by the remaining amount detection device.

Work vehicle

Growing community of inventors

Ushiku, Japan

Masashi Yamashita