Mitsubishi Heavy Industries Limited

Nippon Yusoki Co., Ltd.

Shingo Yuguchi

Kensuke Futahashi

Masataka Kawaguchi

Fujio Eguchi

Kazuhito Kawashima

Hiroshi Satou

Keizo Ogino

Michio Akao

Tomohiro Akaki

Toshiyuki Honda

Kensuke c/o Takasago Research&Development Center Nihashi

Masataka c/o Takasago Research&Development Center Kawaguchi

Toshiyuki c/o General Machinery&Special Vehicle Headq Honda

Fujio c/o General Machinery&Special Vehicle Headquarters Eguchi

Hiroshi c/o Takasago Research&Development Center Satou

Hiroshi c/o Takasago Research & Development Center Satou

Kensuke c/o Takasago Research & Development Center Nihashi

Kazushi Kawashima

Fujio c/o General Machinery & Special Vehicle Headquarters Eguchi

Masataka c/o Takasago Research & Development Center Kawaguchi

Tomohiro c/o Takasago Research & Development Center Akagi

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

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Nagaokakyo, Japan

Shingo Yuguchi