Battery-driven hydraulic excavator
First Claim
1. A battery-driven hydraulic excavator comprising:
- a battery;
an electric motor driven by power from the battery;
a hydraulic pump driven by the electric motor;
a plurality of actuators driven by operating oil discharged from the hydraulic pump;
operating levers for controlling the operation of the actuators;
a feed line for feeding operating oil into the actuators by the driving of said hydraulic pump;
a return line for joining operating oil which were not fed into the actuators by said feed line to return the operating oil to an oil tank;
a flow rate detector positioned to detect the flow rate of the operating oil in said return line; and
a control means for supplying power to the electric motor in inverse proportion to the flow rate detected by said flow rate detector.
1 Assignment
0 Petitions
Accused Products
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.
20 Citations
6 Claims
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1. A battery-driven hydraulic excavator comprising:
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a battery; an electric motor driven by power from the battery; a hydraulic pump driven by the electric motor; a plurality of actuators driven by operating oil discharged from the hydraulic pump; operating levers for controlling the operation of the actuators; a feed line for feeding operating oil into the actuators by the driving of said hydraulic pump; a return line for joining operating oil which were not fed into the actuators by said feed line to return the operating oil to an oil tank; a flow rate detector positioned to detect the flow rate of the operating oil in said return line; and a control means for supplying power to the electric motor in inverse proportion to the flow rate detected by said flow rate detector. - View Dependent Claims (2, 3, 4, 5, 6)
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Specification