CLOSED-LOOP HYDRAULIC SYSTEM HAVING ENERGY RECOVERY
First Claim
Patent Images
1. A hydraulic system, comprising:
- a pump having variable-displacement;
a first linear actuator and a second linear actuator coupled to operate in tandem and connected to the pump in closed-loop manner, each of the first and second linear actuators having a first chamber and a second chamber separated by a piston; and
an accumulator in fluid communication with the second chamber of only the second linear actuator.
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Abstract
A hydraulic system is disclosed. The hydraulic system may have a pump with variable-displacement, a first linear actuator, and a second linear actuator coupled to the first linear actuator to operate in tandem. The first and second linear actuators may be connected to the pump in closed-loop manner, and each of the first and second linear actuators may have a first chamber and a second chamber separated by a piston. The hydraulic system may also have an accumulator in fluid communication with the second chamber of only the second linear actuator.
9 Citations
20 Claims
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1. A hydraulic system, comprising:
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a pump having variable-displacement; a first linear actuator and a second linear actuator coupled to operate in tandem and connected to the pump in closed-loop manner, each of the first and second linear actuators having a first chamber and a second chamber separated by a piston; and an accumulator in fluid communication with the second chamber of only the second linear actuator. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A hydraulic system, comprising:
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a pump having variable-displacement; a first hydraulic cylinder and a second hydraulic cylinder coupled to raise and lower a boom in tandem and connected to the pump in closed-loop manner, each of the first and second hydraulic cylinders having a rod-end chamber fluidly connectable in parallel to the pump and a head-end chamber separated from the rod-end chamber by a piston; and an accumulator in fluid communication with the head-end chamber of only the first hydraulic cylinder, wherein the head-end chamber of the second hydraulic cylinder is isolated from pump. - View Dependent Claims (14, 15)
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16. A method of operating a hydraulic system, comprising:
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pressurizing fluid with a pump; directing fluid pressurized by the pump into first and second linear actuators operating in tandem and returning fluid from the first and second linear actuators to the pump via a closed-loop circuit; and accumulating fluid from and discharging accumulated fluid into a head-end chamber of only the second linear actuator. - View Dependent Claims (17, 18, 19, 20)
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Specification