Battery-driven hydraulic excavator

Details Battery-driven hydraulic excavator Battery-driven hydraulic excavator

1997-11-14

1999-06-22

Nguyen, Hoang

Power plants

Pressure fluid source and motor

Having condition responsive control in a system of distinct...

60432, F16D 3102

Patent

active

059138114

ABSTRACT:
The battery-driven hydraulic excavator comprises an electric motor driven by power from the battery, a hydraulic pump driven by the electric motor, and a plurality of hydraulic actuators driven by operating oil from the hydraulic pump. There are provided supply lines for feeding the operating oil in an oil tank from the hydraulic pump into the hydraulic actuators. A differential pressure gauge for detecting the flow rate of operating oil is provided in a main supply line for joining operating oil which were not fed into the hydraulic actuators to return it to the oil tank. Control is made so that power in inverse proportion to the flow rate detected by the differential pressure gauge is supplied to the electric motor. Thereby, the life of the battery can be extended.

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