Working machine driving unit
First Claim
1. A work machine driving device for operating a working unit by a plurality of hydraulic actuator systems, the work machine driving device comprising:
- an engine;
a power generating device adapted to be driven by the engine;
a power storage device for storing the electric power generated by the power generating device;
a plurality of driving circuits, each of which is provided for each respective hydraulic actuator system and adapted to be operated by electric power supplied from at least one of the power generating device and the power storage device so as to generate hydraulic pressure, thereby driving each respective hydraulic actuator system; and
one or more supporting circuits, each of which serves to feed supporting hydraulic fluid from one driving circuit to another driving circuit to make up a shortfall in the hydraulic fluid.
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Accused Products
Abstract
A driving device of a work machine includes a power generator adapted to be driven by an engine, and a power storage device for storing the electric power generated by the power generator. Electric motors and a motor generator, both adapted to be operated by electric power supplied from either one or both of the power generator and the power storage device respectively drive pumps and a pump motor. Supporting circuits for feeding supporting hydraulic oil are provided between a plurality of driving circuits that drive a plurality of hydraulic actuators of a working unit by oil hydraulics generated by the pumps and the pump motor. By enabling the plurality of driving circuits to effectively share excess energy, the invention makes possible a compact construction of a driving device of a work machine.
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Citations
16 Claims
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1. A work machine driving device for operating a working unit by a plurality of hydraulic actuator systems, the work machine driving device comprising:
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an engine;
a power generating device adapted to be driven by the engine;
a power storage device for storing the electric power generated by the power generating device;
a plurality of driving circuits, each of which is provided for each respective hydraulic actuator system and adapted to be operated by electric power supplied from at least one of the power generating device and the power storage device so as to generate hydraulic pressure, thereby driving each respective hydraulic actuator system; and
one or more supporting circuits, each of which serves to feed supporting hydraulic fluid from one driving circuit to another driving circuit to make up a shortfall in the hydraulic fluid. - View Dependent Claims (2, 3, 4, 6, 7, 8, 9, 14, 15, 16)
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5. A work machine driving device for operating a working unit by a plurality of hydraulic actuator systems, the work machine driving device comprising:
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an engine;
a power transmission device connected to the engine;
a motor generator connected to the power transmission device and functions as a motor and a power generating device;
a power storage device storing the electric power generated by the motor generator and supplying the motor generator with electric power;
a pump motor connected to the power transmission device, the pump motor having functions of both a pump adapted to be driven by at least one of the engine and the motor generator, and a hydraulic motor driving the motor generator;
pumps connected to the power transmission device and driven by at least one of the engine and the motor generator;
a plurality of driving circuits respectively provided for the hydraulic actuator systems, each driving circuit adapted to be operated by hydraulic fluid supplied from at least one of the pump motor and the corresponding pump, thereby driving the corresponding hydraulic actuator system, and recover back to a tank and return to at least one of the pump motor and the corresponding pump the hydraulic fluid returned from the hydraulic actuator system; and
at least one supporting circuit which serves to feed supporting hydraulic fluid from one driving circuit to another driving circuit to make up shortfall in the hydraulic fluid. - View Dependent Claims (10, 11, 12, 13)
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Specification