Mitsubishi Nichiyu Forklift Co., Ltd.

Mitsubishi Heavy Industries Limited

Nippon Yusoki Co., Ltd.

Mitsubishi Logisnext Co. Ltd.

Masataka Kawaguchi

Kensuke Futahashi

Kiyomitsu Ogawa

Fujio Eguchi

Kazuhito Kawashima

Hiroshi Satou

Toshiyuki Honda

Keizo Ogino

Shingo Yuguchi

Michio Akao

Hideki Hashimoto

Takaharu Hiroe

Megumu Tsuruta

Koichi Yamada

Hiroyuki Kanazawa

Ryota Adachi

Yasutaka Fuke

Ryuichi Umehara

Tomohiro Akaki

Hiroyuki Iiyama

Naohito Hashimoto

Hiroyuki Sugiura

Osamu Nakakita

Wataru Mizunuma

Yasunobu Igashima

A forklift includes a forklift body having a front wheel and a rear wheel, a fork supported to the front of the forklift body so as to be capable of moving vertically via a mast, a lift cylinder capable of moving the fork up and down, a hydraulic pressure supply line capable of supplying hydraulic pressure to a head-side chamber in the lift cylinder, a hydraulic pressure exhaust line capable of exhausting hydraulic pressure from a rod-side chamber in the lift cylinder, and a changeover valve provided on the hydraulic pressure exhaust line, wherein a control device changes a pressure balance between hydraulic pressure on the head-side chamber and hydraulic pressure on the rod-side chamber in the lift cylinder by the changeover valve to restrict the operation of the lift cylinder, when a weight of a load on the fork exceeds a limit load weight.

Forklift

The electric-vehicle control device is used in an electric vehicle which is provided with a vehicle body having a driving tire and an axle shaft and with a driving motor which imparts torque to the driving tire. The electric-vehicle control device issues a motor control command to the driving motor. The electric-vehicle control device is provided with a control unit, and the control unit gives feedback control to the driving motor by vibration parameters indicating vertical vibration of the electric vehicle at the center of the axle shaft.

Electric-vehicle control device, and electric vehicle and forklift truck having the same

A steering control device obtains a command steering reactive force according to a wheel angle based on a wheel angle and table data representing the correlation between the wheel angle and the command steering reactive force, and which controls an electric-control brake to make the steering reactive force equal to the command steering reactive force. The steering control device: obtains a correction coefficient according to vehicle state amounts based on the vehicle state amounts other than the wheel angle, which are detected by vehicle state amount detecting means, and table data representing the correlation between the vehicle state amounts and the correction coefficients; corrects the table data by using the correction coefficients; obtains a command steering reactive force according to the wheel angle based on the table data and the wheel angle; and controls the electric-control brake to make the steering reactive force equal to the command steering reactive force.

Vehicle steering control device and method

A hybrid industrial vehicle performs steering operation and the like during idling stop, without using a complicated mechanism. The hybrid industrial vehicle configured to transmit power of a first electric motor () and power of an engine () to a drive wheel () through a first gear train () comprises: a second electric motor () actuated when supplied with electric power from a battery (); a first hydraulic pump () supplying pressure oil to a cargo handling hydraulic system; a second gear train () interposed among the engine and the second electric motor and the first hydraulic pump and capable of mutual power transmission among the engine, the second electric motor and the first hydraulic pump; a second hydraulic pump () supplying pressure oil to a steering hydraulic system; and a third electric motor () actuated to drive the second hydraulic pump when supplied with electric power from the battery.

Hybrid industrial vehicle

An object is to provide a work vehicle whose drive portion can be downsized. An engine having an engine output shaft, an electric motor driven by a battery which is attached integrally to the engine output shaft so as to drive the engine output shaft, a traveling drive portion having a transmission connected to the engine output shaft and a traveling drive shaft which is rotated by the transmission and which moves the traveling wheels, a work drive portion selectively performing work by means of power from the engine output shaft, a generator charging the battery, a traveling regeneration portion transmitting regenerative energy of the traveling drive portion to the generator, a work regeneration portion transmitting regenerative energy of a fork drive portion to the generator, and a one-way clutch for traveling and a one-way clutch for work provided, respectively, to the traveling regeneration portion and the work regeneration portion, which suppress transmission of motive power from the generator, are included.

Work vehicle

An energy recovering system in a hydraulic lift device of a battery operated industrial truck. With the system, working oil can be supplied to other hydraulic actuators while energy recovering operation is performed by the hydraulic lift device, occurrence of pressure pulsation in the working oil can be prevented, and energy recovering efficiency is increased. The hydraulic lift device comprises a lift cylinder () for lifting a fork F, an electric motor () rotated by power supply from a battery (), a hydraulic pump () for supplying pressurized oil to the lift cylinder (), a control valve () disposed in a pressurized oil supply path (), and a controller (). The controller () controls the opening of the control valve () and rotation speed of the electric motor () which functions as an electric generator driven by the hydraulic pump () rotated by the action of the pressurized oil returning from the lift cylinder () when a load is lowered so that the generated electricity charges the battery () to recover the potential energy of the load.

Energy recovering method and system in hydraulic lift device of battery operated industrial trucks

An energy recovering system of a hydraulic lift device for a battery operated industrial truck. With the system, working oil can be supplied to other hydraulic actuators while energy recovering operation is performed by the hydraulic lift device, and energy recovering efficiency is increased. A hydraulic motor () is disposed in a fluid path for recovering pressurized working fluid from a lift cylinder () via a control valve () to a working fluid reservoir tank () so that the hydraulic motor () is driven by the pressurized working fluid returning from the lift cylinder (). The hydraulic motor () is connected to an electric motor () for driving a hydraulic pump (), which supplies pressurized fluid to the lift cylinder (), by means of a one-way clutch () which performs torque transmission only from the hydraulic motor () to the electric motor ().

Energy recovering system of hydraulic lift device for battery operated industrial trucks

Growing community of inventors

Takasago, Japan

Masataka Kawaguchi