Meterless hydraulic system having flow sharing and combining functionality
First Claim
1. A hydraulic system comprising:
- a variable-displacement first pump;
a variable-displacement second pump;
a first actuator selectively connected either to the first pump in a closed loop manner and not the second pump, to the second pump in a closed loop manner and not the first pump, or to the first and second pumps in a closed loop manner;
a second actuator selectively connected either to the first pump in a closed loop manner and not the second pump, to the second pump in a closed loop manner and not the first pump, or to the first and second pumps in a closed loop manner; and
a variable-displacement rotary actuator selectively connected either to the first pump in a closed loop manner and not the second pump, to the second pump in a closed loop manner and not the first pump, or to the first and second pumps in a closed loop manner.
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Accused Products
Abstract
A hydraulic system includes a variable-displacement first pump and a variable-displacement second pump. The hydraulic system also includes a first actuator selectively connected either to the first pump in a closed loop manner and not the second pump, to the second pump in a closed loop manner and not the first pump, or to the first and second pumps in a closed loop manner. The hydraulic system further includes a second actuator and a variable-displacement rotary actuator that are each selectively connected either to the first pump in a closed loop manner and not the second pump, to the second pump in a closed loop manner and not the first pump, or to the first and second pumps in a closed loop manner.
72 Citations
23 Claims
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1. A hydraulic system comprising:
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a variable-displacement first pump; a variable-displacement second pump; a first actuator selectively connected either to the first pump in a closed loop manner and not the second pump, to the second pump in a closed loop manner and not the first pump, or to the first and second pumps in a closed loop manner; a second actuator selectively connected either to the first pump in a closed loop manner and not the second pump, to the second pump in a closed loop manner and not the first pump, or to the first and second pumps in a closed loop manner; and a variable-displacement rotary actuator selectively connected either to the first pump in a closed loop manner and not the second pump, to the second pump in a closed loop manner and not the first pump, or to the first and second pumps in a closed loop manner. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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19. A hydraulic system comprising:
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a variable-displacement first pump; a variable-displacement second pump; a first actuator configured to connect to at least one of the first pump or the second pump in a closed loop manner; a linear actuator configured to connect to at least one of the first pump or the second pump in a closed loop manner; a variable-displacement rotary actuator configured to connect to at least one of the first pump or the second pump in a closed loop manner; at least one combiner valve arrangement configured to combine fluid pressurized by the first pump and the second pump to form a combined flow, the combined flow being communicated in a closed loop manner to at least one of the first actuator, the linear actuator, or the rotary actuator; and at least one first switching valve connected to the linear actuator, the at least one switching valve being configured to control an amount of fluid directed to the linear actuator from at least one of the first pump or the second pump; wherein the first and second pumps are capable of simultaneously supplying pressurized fluid to the first actuator, the linear actuator, and the rotary actuator. - View Dependent Claims (20, 21)
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22. A method of operating a hydraulic system, the method comprising:
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pressurizing fluid with a first variable-displacement pump; pressurizing fluid with a second variable-displacement pump, the first and second pumps being capable of simultaneously supplying pressurized fluid to at least three actuators, the at least three actuators including a variable-displacement rotary actuator, a linear actuator, and a third actuator; combining fluid pressurized by the first pump and the second pump; communicating the combined fluid to at least one of the at least three actuators in a closed loop manner; communicating fluid pressurized by at least one of the first pump or the second pump to the linear actuator in a closed loop manner; communicating fluid pressurized by at least one of the first pump or the second pump to the rotary actuator in a closed loop manner; adjusting displacement of the rotary actuator to control torque output of the rotary actuator; and metering the flow passing between the first and second pumps and the linear actuator to control movement of the linear actuator. - View Dependent Claims (23)
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Specification