Closed-loop hydraulic system having priority-based sharing
First Claim
1. A hydraulic system, comprising:
- a first pump;
a second pump;
a third pump;
a first actuator connected to the first pump in closed-loop manner;
a second actuator connected to the second pump in closed-loop manner;
a third actuator;
a selector valve associated with the third pump; and
a first switching valve associated with the third pump and the third actuator,wherein the first switching valve is movable between a first position at which the third pump is connected to the third actuator in a closed-loop manner to move the third actuator in a first direction, a second position at which the third pump is connected to the third actuator in a closed-loop manner to move the third actuator in a second direction, and a third position at which the third pump is connected to the selector valve.
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Accused Products
Abstract
A hydraulic system is disclosed having first, second, and third pumps. The hydraulic system may also have a first actuator connected to the first pump in closed-loop manner, a second actuator connected to the second pump in closed-loop manner, and a third actuator. The hydraulic system may further have a selector valve associated with the third pump, and a first switching valve associated with the third pump and the third actuator. The first switching valve may be movable between a first position at which the third pump is connected to the third actuator in a closed-loop manner to move the third actuator in a first direction, a second position at which the third pump is connected to the third actuator in a closed-loop manner to move the third actuator in a second direction, and a third position at which the third pump is connected to the selector valve.
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Citations
20 Claims
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1. A hydraulic system, comprising:
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a first pump; a second pump; a third pump; a first actuator connected to the first pump in closed-loop manner; a second actuator connected to the second pump in closed-loop manner; a third actuator; a selector valve associated with the third pump; and a first switching valve associated with the third pump and the third actuator, wherein the first switching valve is movable between a first position at which the third pump is connected to the third actuator in a closed-loop manner to move the third actuator in a first direction, a second position at which the third pump is connected to the third actuator in a closed-loop manner to move the third actuator in a second direction, and a third position at which the third pump is connected to the selector valve. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A hydraulic system, comprising:
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a unidirectional variable-displacement first pump; a unidirectional variable-displacement second pump; a unidirectional variable-displacement third pump; a boom actuator connected to the first pump in closed-loop manner; a stick actuator connected to the second pump in closed-loop manner; a tool actuator; a selector valve movable between a first position at which the third pump is connected to the boom actuator in a closed-loop manner, a second position at which the third pump is connected to the stick actuator, and a third position at which an output of the third pump is connected to an input of the third pump; a first switching valve associated with the third pump and the tool actuator, the first switching valve being movable between a first position at which the third pump is connected to the tool actuator in a closed-loop manner to move the tool actuator in a first direction, a second position at which the third pump is connected to the tool actuator in a closed-loop manner to move the tool actuator in a second direction, and a third position at which the third pump is connected to the selector valve; a second switching valve movable between a first position at which the first pump is connected to the boom actuator in a closed-loop manner to move the boom actuator in a first direction, a second position at which the first pump is connected to the boom actuator in a closed-loop manner to move the boom actuator in a second direction, and a third position at which the first pump is substantially isolated from the boom actuator; and a third switching valve movable between a first position at which the second pump is connected to the stick actuator in a closed-loop manner to move the stick actuator in a first direction, a second position at which the second pump is connected to the stick actuator in a closed-loop manner to move the stick actuator in a second direction, and a third position at which the second pump is substantially isolated from the stick actuator, wherein; when the first switching valve is in the third position, the tool actuator is substantially isolated from the third pump and from the selector valve; and when the first switching valve is in the first or second positions, fluid discharged from the tool actuator is fluidly communicated with the selector valve.
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16. A method of operating a hydraulic system, comprising:
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pressurizing fluid with a first pump; directing pressurized fluid from the first pump to a first actuator via a closed-loop first circuit; pressurizing fluid with a second pump; directing pressurized fluid from the second pump to a second actuator via a closed-loop second circuit; pressurizing fluid with a third pump; and selectively directing pressurized fluid from the third pump through a third actuator to the first or second circuits via a closed-loop third circuit, or directing pressurized fluid from the third pump to bypass the third actuator and enter the first or second circuits via the third circuit. - View Dependent Claims (17, 18, 19, 20)
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Specification