Energy regeneration system for machines
First Claim
Patent Images
1. An energy regeneration system for machinery comprising:
- a fluid pressure actuator adapted to operate by being supplied or discharging fluid;
a first 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 first 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;
first energy regeneration device for regenerating the energy of discharge fluid as electrical energy, at least in part by rotating the first regenerating fluid pressure motor;
the displacement of the first regenerating fluid pressure motor is controlled so that the flow rate of discharge fluid from the fluid pressure actuator varies from zero to a predetermined maximum valuea relief flow path connected to a supply flow path for fluid to be supplied to the fluid pressure actuator between an intermediate part of the supply flow path and a fluid tank;
a second displacement variable regenerating fluid pressure motor in the relief flow path such that controlling the displacement of the second regenerating fluid pressure motor allows the pressure of the supply flow path to the fluid pressure actuator to be controlled; and
a second regeneration device for regenerating the rotational energy of fluid in the relief flow path as electrical energy, at least in part by rotating the second regenerating fluid pressure motor.
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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.
26 Citations
17 Claims
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1. An energy regeneration system for machinery comprising:
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a fluid pressure actuator adapted to operate by being supplied or discharging fluid; a first 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 first 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; first energy regeneration device for regenerating the energy of discharge fluid as electrical energy, at least in part by rotating the first regenerating fluid pressure motor; the displacement of the first regenerating fluid pressure motor is controlled so that the flow rate of discharge fluid from the fluid pressure actuator varies from zero to a predetermined maximum value a relief flow path connected to a supply flow path for fluid to be supplied to the fluid pressure actuator between an intermediate part of the supply flow path and a fluid tank; a second displacement variable regenerating fluid pressure motor in the relief flow path such that controlling the displacement of the second regenerating fluid pressure motor allows the pressure of the supply flow path to the fluid pressure actuator to be controlled; and a second regeneration device for regenerating the rotational energy of fluid in the relief flow path as electrical energy, at least in part by rotating the second regenerating fluid pressure motor. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A 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; 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; said first and second flow rate control lines each comprise a supply/discharge line connected with said first and second supply/discharge ports of said hydraulic actuator, respectively; said at least one displacement variable hydraulic motor comprises a first and a second displacement variable hydraulic motor disposed one within each of said first and second supply/discharge lines. - View Dependent Claims (12, 13, 14)
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15. A method of operating a hydraulic system comprising the steps of:
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supplying hydraulic fluid to a hydraulic actuator; diverting a portion of fluid away from the hydraulic actuator into a relief path if a pressure of the supplying hydraulic fluid exceeds a predetermined relief pressure; 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; and
recovering energy from fluid flowing in the relief path. - View Dependent Claims (16, 17)
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Specification