Hitachi Construction Machinery Co., Ltd.

Toshio Kotaka

Satoru Kaneko

Hidekazu Moriki

Toru Kikuchi

Takashi Ikimi

Noritaka Ito

Kazuo Ishida

Noritaka Itou

Satoshi Sekino

Hiroaki Yanagimoto

Masaki Higurashi

This invention includes a hydraulic pump (), a working implement () having a lift cylinder () driven by a hydraulic fluid supplied from the hydraulic pump (), an operating device () for operating the working implement (), a traveling motor () for driving wheels, and a main controller (). When the lift cylinder () fails to operate despite an extending instruction being imparted to the lift cylinder () via the operating device (), the main controller () reduces a limit value for an increase rate of a torque required in the traveling motor () to a value smaller than that applied when the lift cylinder () operates. With this configuration, occurrence of wheel slip during lifting of an object to be carried can be reduced.

Construction vehicle

[Problem] To provide a hybrid work vehicle which is simple in configuration, good in ease of mounting on a vehicle and capable of efficiently transmitting motive power. [Solution] The hybrid work vehicle includes: an engine (); a hydraulic pump () which is driven by the engine; a work device () which is disposed at the front of the vehicle and performs work using the hydraulic pump as a drive source; a motor/generator () which generates electric power by use of the torque of the engine; and a travel drive device which causes the vehicle to travel by rotating and driving wheels by use of the electric power generated by the motor/generator. The hybrid work vehicle is steered while the vehicle bends by way of a center joint (). The travel drive device includes: a plurality of electric motors (and); and a propeller shaft () which is linked with the plurality of electric motors and transmits motive power from the plurality of electric motors to the wheels. The plurality of electric motors are disposed at the front and rear sides of the center joint with the center joint being disposed therebetween.

Hybrid work vehicle

Growing community of inventors

Tsuchiura, Japan

Toshio Kotaka