Takeuchi Mfg. Co., Ltd.

Masao Yoshioka

Yutaka Yamazaki

Yoshihide Shimada

Akio Takeuchi

Akira Yamamoto

An electrically driven industrial vehicle comprising a revolving body () attached to a undercarriage () so as to be able to turn horizontally; a power shovel device () for receiving a hydraulic drive force and operating, the power shovel device being mounted on the revolving body (); and a hydraulic drive force generating unit provided to the revolving body (), for generating hydraulic drive force for operating the power shovel device (). The hydraulic drive force generating unit has a hydraulic fluid tank () for storing hydraulic fluid; a hydraulic pump () for feeding the hydraulic fluid in the hydraulic fluid tank to the power shovel device (); an electric motor () for driving the hydraulic pump; and a lithium ion battery () for feeding electrical drive power to the electric motor.

Electrically driven industrial vehicle

A power shovel vehicle including a hydraulic pump that outputs hydraulic oil for operating a hydraulic actuator, an electric motor for driving the hydraulic pump, a main battery for supplying direct current electric power, an inverter for converting the direct current electric power into alternating current electric power and operating the electric motor, a second relay for making and breaking the connection between the main battery and the inverter, an operating device for operating the hydraulic actuator, a controller for controlling operation of the hydraulic actuator and inverter, and turning on and off the second relay, a first relay for making and breaking the connection between the main battery and the controller, a power source monitoring controller for monitoring conditions of the main battery and turning on and off the first relay, a hydraulic sensor for detecting the discharge pressure of the hydraulic pump, and an electric current sensor for measuring a load current flowing into the inverter.

Working vehicle

A crawler type power shovel vehicle () operated by a hydraulic actuator (), constructed from an electric motor () for driving a hydraulic pump () for supplying hydraulic oil to the hydraulic actuator (), a battery () for supplying direct current power, an inverter () for operating the electric motor () by converting the direct current power into alternating current power and supplying it to the motor, a controller () for causing the inverter () to control operation of the electric motor (), and a voltage/current sensor () for detecting the magnitude of a load current flowing from the battery () into the inverter (). The controller () stops the motor () when the magnitude of the load current detected by the voltage/current sensor () continuously exceeds a predetermined threshold for a predetermined time period.

A shovel loader () has a vehicle body frame (), a travel device (), a loader device (), and a drive power generation section for generating drive power for making the travel device () travel. The vehicle body frame () has a pair of side frames () arranged on both the left and right sides of the shovel loader (). The loader device () is made up of a pair of lift arms () vertically swingably attached to the pair of side frames () and of a bucket () vertically swingably attached to the forward end of the pair of lift arms (). The drive power generation section has a pair of electric motors () for individually transmitting drive power to the pair of travel devices () and capable of being controlled independent of each other so that a vehicle () can be made to travel in a manner the left and right are independent of each other, and also has a battery () for supplying electric power to the electric motors ().

Growing community of inventors

Nagano, Japan

Masao Yoshioka