Energy recovery system for hydraulic machine
First Claim
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1. An energy recovery system, comprising:
- a tank;
a pump configured to draw fluid from the tank and pressurize the fluid;
an actuator;
an actuator control valve movable to direct pressurized fluid from the pump to the actuator and from the actuator to the tank to move the actuator;
a motor mechanically connected to a rotary device and configured to selectively receive fluid discharged from the actuator and transmit power to the rotary device;
at least one valve movable to selectively redirect fluid exiting the motor back to the actuator; and
a plurality of passages connecting a first chamber of the actuator to a second chamber of the actuator via the motor, wherein the at least one valve includes;
a first control valve associated with the first chamber of the actuator′ and
a second control valve associated with the second chamber of the actuator.
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Abstract
An energy recovery system is disclosed for use with a hydraulic machine. The energy recovery system may have a tank, a pump configured to draw fluid from the tank and pressurize the fluid, an actuator, and an actuator control valve movable to direct pressurized fluid from the pump to the actuator and from the actuator to the tank to move the actuator. The energy recovery system may also have a motor mechanically connected to a rotary device and configured to selectively receive fluid discharged from the actuator, and at least one valve movable to selectively redirect fluid exiting the motor back to the actuator.
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Citations
18 Claims
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1. An energy recovery system, comprising:
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a tank; a pump configured to draw fluid from the tank and pressurize the fluid; an actuator; an actuator control valve movable to direct pressurized fluid from the pump to the actuator and from the actuator to the tank to move the actuator; a motor mechanically connected to a rotary device and configured to selectively receive fluid discharged from the actuator and transmit power to the rotary device; at least one valve movable to selectively redirect fluid exiting the motor back to the actuator; and a plurality of passages connecting a first chamber of the actuator to a second chamber of the actuator via the motor, wherein the at least one valve includes; a first control valve associated with the first chamber of the actuator′ and a second control valve associated with the second chamber of the actuator. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A method of recovering energy, comprising:
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drawing fluid from a tank; pressurizing the fluid with a pump; selectively directing pressurized fluid from the pump into an actuator and directing fluid from the actuator to a tank to move the actuator; directing fluid discharged from the actuator through a motor to drive the pump; and redirecting fluid from the motor back to the actuator with a first control valve associated with a first chamber of the actuator and a second control valve associated with a second chamber of the actuator, the first and second chambers of the actuator being connected by a plurality of passages. - View Dependent Claims (16, 17)
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18. A machine, comprising;
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an undercarriage; a boom pivotally connected to the undercarriage; a work tool operatively connected to the boom; a pair of linear actuators configured to lift the boom and the work tool; a tank; a pump configured to draw fluid from the tank and pressurize the fluid; an actuator control valve movable to selectively direct pressurized fluid from the pump to the pair of linear actuators and from the pair of linear actuators to the tank; a motor connected to selectively receive fluid discharged from the pair of linear actuators and mechanically connected to the pump; an accumulator configured to store fluid discharged from the pair of linear actuators and to direct stored fluid to the motor to drive the pump; and at least one control valve disposed downstream of the motor and movable to selectively direct fluid discharged from the motor into the tank, into a first chamber of the pair of linear actuators, or into a second chamber of the pair of linear actuators, wherein the first chamber and the second chamber are connected by a plurality of passages, and wherein the at least one control valve includes; a first control valve associated with the first chamber of the pair of linear actuators; and a second control valve associated with the second chamber of the linear actuators.
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Specification