Meterless hydraulic system having multi-actuator circuit
First Claim
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1. A hydraulic system, comprising:
- a pump;
a rotary actuator;
a linear actuator;
a closed-loop circuit fluidly connecting the pump to the rotary and linear actuators, wherein the closed loop circuit includes;
a first pump passage fluidly connected between the pump and the rotary actuator;
a second pump passage fluidly connected between the pump and the rotary actuator;
a first actuator passage fluidly connected to a first chamber of the linear actuator; and
a second actuator passage fluidly connected to a second chamber of the linear actuator; and
at least one valve configured to switch fluid flow direction from the pump through the linear actuator during fluid flow in a single direction through the rotary actuator, wherein the at least one valve includes;
a first valve disposed between the first pump passage and the first actuator passage;
a second valve disposed between the first pump passage and the second actuator passage;
a third valve disposed between the second pump passage and the first actuator passage; and
a fourth valve disposed between the second pump passage and the second actuator passage.
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Abstract
A hydraulic system is disclosed. The hydraulic system may have a pump, a rotary actuator, a linear actuator, and a closed-loop circuit fluidly connecting the pump to the rotary and linear actuators. The hydraulic system may also have at least one valve configured to switch fluid flow direction from the pump through the linear actuator during fluid flow in a single direction through the rotary actuator.
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Citations
18 Claims
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1. A hydraulic system, comprising:
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a pump; a rotary actuator; a linear actuator; a closed-loop circuit fluidly connecting the pump to the rotary and linear actuators, wherein the closed loop circuit includes; a first pump passage fluidly connected between the pump and the rotary actuator; a second pump passage fluidly connected between the pump and the rotary actuator; a first actuator passage fluidly connected to a first chamber of the linear actuator; and a second actuator passage fluidly connected to a second chamber of the linear actuator; and at least one valve configured to switch fluid flow direction from the pump through the linear actuator during fluid flow in a single direction through the rotary actuator, wherein the at least one valve includes; a first valve disposed between the first pump passage and the first actuator passage; a second valve disposed between the first pump passage and the second actuator passage; a third valve disposed between the second pump passage and the first actuator passage; and a fourth valve disposed between the second pump passage and the second actuator passage. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A hydraulic system, comprising:
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a pump; a rotary actuator; a linear actuator; a closed-loop circuit fluidly connecting the pump to the rotary and linear actuators; at least one valve configured to switch fluid flow direction from the pump through the linear actuator during fluid flow in a single direction through the rotary actuator; the closed loop circuit includes; a first pump passage fluidly connected between the pump and the rotary actuator; a second pump passage fluidly connected between the pump and the rotary actuator; a first actuator passage fluidly connected to a first chamber of the linear actuator; and a second actuator passage fluidly connected to a second chamber of the linear actuator; and the at least one valve includes a single spool valve configured to selectively connect the first pump passage to the first or second actuator passages and the second pump passage to the first or second actuator passages, wherein the single spool valve includes a tool float position at which first and second chambers of the linear actuator are fluidly connected to each other and simultaneously fluidly connected to the first pump passage. - View Dependent Claims (13)
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14. A hydraulic system, comprising:
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a variable displacement, over-center pump; a variable displacement, over-center motor; a linear actuator; a closed-loop circuit fluidly connecting the pump to the motor and the linear actuator; at least one isolation valve configured to isolate the motor from the linear actuator and from the pump; at least one valve configured to switch fluid flow direction from the pump through the linear actuator during fluid flow in a single direction through the motor; an operator interface device configured to receive operator input indicative of a desired movements of the motor and the linear actuator; and a controller in communication with the operator interface device, the pump, and the motor, the controller being configured to; adjust operation of the pump based on only desired movement of the motor when movement of the linear actuator is not desired; adjust operation of the pump based on only desired movement of the linear actuator anytime movement of the linear actuator is desired; and adjust operation of the motor based on desired movement of the motor when movement of both the motor and the linear actuator is desired. - View Dependent Claims (15, 16)
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17. A method of operating a hydraulic system, comprising:
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pressurizing fluid with a pump; directing fluid pressurized by the pump to a motor and a linear actuator and returning fluid from the motor and linear actuator to the pump via a closed-loop circuit; receiving an indication of operator desired movement of the motor and linear actuator; and adjusting operation of the pump based on the indication, wherein adjusting operation includes; adjusting operation of the pump based on only desired movement of the motor when movement of the linear actuator is not desired; adjusting operation of the pump based on only desired movement of the linear actuator anytime movement of the linear actuator is desired; and adjusting operation of the motor based on desired movement of the motor when movement of both the motor and the linear actuator is desired. - View Dependent Claims (18)
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Specification