Komatsu Corporation

Komatsu Utility Co., Ltd.

Komatsu Zenoah Co.

Shinichi Itou

Takenobu Andou

Katsumi Yokoo

Junji Mimuro

In a working vehicle having a tilt floor, a torsion bar has one end mounted on the tilt floor and the other end thereof mounted on a base frame, and is disposed on the tilt floor which is tilted up and down relative to the base frame. In a maximally opened position where the tilt floor is tilted up and a closed position where the tilt floor is tilted down, a position of a barycenter (G) of the tilt floor on which the driving room (C) is disposed is opposite from each other relative to a turning center of the tilt floor across the top dead center.

Working vehicle with tilt floor

A lineis provided with a linecommunicating the lineand a hydraulic oil tank. The lineis provided with a throttleto construct a throttle-provided line. When air is trapped between the hydraulic oil tankand the hydraulic pump, the hydraulic pumpis driven to discharge the air from the throttle-provided lineto the hydraulic oil tank, thereby removing the air in the hydraulic circuit. When the air is removed, resistance caused by the throttleis increased, which makes hydraulic oil flow from a pilot pumpto a PPC valve. Since the throttle-provided linerealizes air removal with a simple structure, a hydraulic cylindercan be supplied with the air-removed hydraulic oil from an initial stage, thereby enhancing responsiveness of the hydraulic cylinder

Hydraulic shovel

A work vehicle cooling system comprises a cooling fan () driven by the output from an engine (), and a flow path for allowing an airflow () generated by the cooling fan () to be flown between the engine () and an operator's seat () without having passed through any of a radiator () and an oil cooler () for the engine (). With this simple configuration, the heat generated by the engine () is prevented from being transmitted to the operator's seat ().

Growing community of inventors

Kawagoe, Japan

Shinichi Itou