Energy regeneration system for work machines
First Claim
1. An energy regeneration system for working machinery comprising:
- a fluid pressure actuator adapted to operate by supplying/discharging fluid;
a displacement variable regenerating fluid pressure motor in a discharge flow path for fluid discharged from the fluid pressure actuator such that controlling the displacement of the regenerating fluid pressure motor allows the flow rate of discharge fluid from the fluid pressure actuator as well as the pressure of the discharge flow path to be controlled; and
an energy regeneration device for regenerating the energy of discharge fluid as electrical energy, at least in part by rotating the regenerating fluid pressure motor.
2 Assignments
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Accused Products
Abstract
First and second displacement variable regenerating hydraulic motors are provided in third and fourth flow rate control lines which function as discharge flow paths for oil discharged, respectively, from first and second oil supply and discharge ports of a hydraulic motor, where controlling the displacement of the regenerating hydraulic motors allows the flow rate of discharge oil as well as the pressure of the third and fourth flow rate control lines to be controlled. First and second generators which generate electric power due to the rotation of the first and second regenerating hydraulic motors are further provided.
17 Citations
20 Claims
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1. An energy regeneration system for working machinery comprising:
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a fluid pressure actuator adapted to operate by supplying/discharging fluid;
a displacement variable regenerating fluid pressure motor in a discharge flow path for fluid discharged from the fluid pressure actuator such that controlling the displacement of the regenerating fluid pressure motor allows the flow rate of discharge fluid from the fluid pressure actuator as well as the pressure of the discharge flow path to be controlled; and
an energy regeneration device for regenerating the energy of discharge fluid as electrical energy, at least in part by rotating the regenerating fluid pressure motor. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A work machine comprising:
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a hydraulic actuator having first and second supply/discharge ports;
a flow rate control circuit including first and second flow rate control lines connecting with said first and second supply/discharge ports, respectively;
at least one displacement variable hydraulic motor within said flow rate control circuit;
at least one pressure sensing means disposed within said flow rate control circuit between said at least one displacement variable hydraulic motor and said hydraulic actuator; and
an energy regeneration device coupled with said displacement variable hydraulic motor for regenerating at least a portion of an energy of discharge fluid of said hydraulic actuator as electrical energy. - View Dependent Claims (13, 14, 15, 16)
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17. A method of operating a hydraulic system comprising the steps of:
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supplying hydraulic fluid to a hydraulic actuator; and
controlling at least one of flow rate and hydraulic pressure in a discharge flow path of the hydraulic actuator at least in part by adjusting a displacement of a hydraulic energy regeneration motor in a hydraulic control circuit of the system. - View Dependent Claims (18, 19, 20)
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Specification