Kabushiki Kaisha Komatsu Seisakusho

Hidemi Maeo

Yoshito Sato

Eiichi Muramoto

Yoshio Tsutsumi

Tokuhiro Yato

Yasuo Fujiwara

An electric hydraulic control device for controlling hydraulic cylinders of work tools in a construction vehicle, in which control valves of the hydraulic cylinders are controlled in two ways. For some work tools which need not be controlled smoothly and finely, the corresponding control valves are controlled directly by an electric signal outputted according to the position of the operation levers, and for other work tools which must be controlled smoothly and finely, the corresponding control valves are controlled through an electric servo mechanism which is operated by an electric signal representative of the amount by which the operation lever is manipulated. In addition, there is provided a detector for detecting as to whether the transmission lever is in the locked condition, and electric systems of all of the control valves are rendered inoperative when the transmission lever is in the locked condition.

Electric hydraulic controll device for a construction vehicle

A track roller suspension apparatus for a track-type vehicle having a track frame and a track assembly mounted on the track frame, which includes a shaft rotatably mounted on the track frame, a first arm rotatably mounted on the shaft, a second arm rotatably mounted on the shaft, the first and second arms being arranged crossing each other, and a pair of track rollers each mounted on the respective arms. Resilient pads are disposed between the first and second arms to absorb shock loads.

Growing community of inventors

Hirakata, Japan

Hidemi Maeo