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US 12,276,086 B2Granted
Hydraulic system for working machine
AssigneeKubota Corporation
InventorYuji Fukuda
Life of this patent
Estimating the term…
Abstract
A hydraulic system for a working machine includes a hydraulic actuator configured to be operated by operation fluid, a control valve connected to the hydraulic actuator, and a communication fluid line for fluid communication between the hydraulic actuator and the control valve. The control valve includes a first supply path to guide the operation fluid toward the hydraulic actuator; a regeneration path to guide the operation fluid having been returned to the control valve from the hydraulic actuator, to the first supply path; and a branched path that branches from the regeneration path and supplies operation fluid to outside of the control valve.
Claims14
A hydraulic system for a working machine, comprising:
- a hydraulic actuator configured to be operated by operation fluid;
- a first control valve connected to the hydraulic actuator;
- a second control valve disposed downstream of the first control valve;
- a communication fluid line for fluid communication between the hydraulic actuator and the control valve;
- and
- a discharge fluid line to discharge the operation fluid from the first control valve,
- wherein the first control valve comprises:
- a first input port, a first communication port, a second communication port, an output port, and a discharge port;
- a first supply path from the first input port to the second communication port to guide the operation fluid toward the hydraulic actuator;
- a regeneration path from the first communication port to the first supply path to guide the operation fluid having been returned to the first control valve from the hydraulic actuator, to the first supply path and not to the discharge fluid line through the discharge port;
- and
- a branched path that branches from the regeneration path and supplies the operation fluid to the second control valve and not to the discharge fluid line, and
- wherein the discharge port is disconnected or isolated from the regeneration path and the branched path, to prevent fluid communication from the regeneration path and the branched path to the discharge port, and
- wherein the branched path has a first throttle.
11 more elements
A hydraulic system for a working machine, comprising:
- a hydraulic actuator configured to be operated by operation fluid;
- a first control valve connected to the hydraulic actuator;
- a second control valve disposed downstream of the first control valve;
- first and second communication fluid lines for fluid communication between the hydraulic actuator and the first control valve;
- and
- a discharge fluid line to discharge the operation fluid from the first control valve to an operation fluid tank,
- wherein the first control valve comprises:
- first and second communication ports connected to the first and second communication fluid lines, respectively:
- first and second input ports through which the operation fluid flows in;
- an output port through which the operation fluid flows out toward the second control valve;
- a discharge port connected to the discharge fluid line;
- a first supply path for fluid communication between the first input port and the second communication port;
- a regeneration path for fluid communication from the first communication port to the first supply path and not to the discharge port;
- and
- a branched path for fluid communication from the regeneration path to the output port and not to the discharge port, and
- wherein the discharge port is disconnected or isolated from the regeneration path and the branched path, to prevent fluid communication from the regeneration path and the branched path to the discharge port, and
- wherein the first control valve further comprises a second supply path for fluid communication between the second input port and the output port through the branched path.
14 more elements
A hydraulic system for a working machine, comprising:
- a hydraulic actuator configured to be operated by operation fluid;
- a first control valve connected to the hydraulic actuator;
- a second control valve disposed downstream of the first control valve;
- a communication fluid line for fluid communication between the hydraulic actuator and the control valve;
- and
- a discharge fluid line to discharge the operation fluid from the first control valve,
- wherein the first control valve comprises:
- a first input port, a first communication port, a second communication port, an output outlet port, and a discharge port;
- a first supply path from the first input port to the second communication port to guide the operation fluid toward the hydraulic actuator;
- a regeneration path from the first communication port to the first supply path to guide the operation fluid having been returned to the first control valve from the hydraulic actuator, to the first supply path and not to the discharge fluid line through the discharge port;
- and
- a branched path that branches from the regeneration path and supplies the operation fluid to the second control valve and not to the discharge fluid line, and
- wherein the discharge port is disconnected or isolated from the regeneration path and the branched path, to prevent fluid communication from the regeneration path and the branched path to the discharge port, wherein
- the first control valve is configured to be switched between a first position at which the hydraulic actuator retracts and a second position at which the hydraulic actuator extends, and
- the operation fluid having been returned to the first control valve is guided through the first control valve to the discharge fluid line when the first control valve is at the first position.
12 more elements
A hydraulic system for a working machine, comprising:
- a hydraulic actuator configured to be operated by operation fluid;
- a first control valve connected to the hydraulic actuator;
- a second control valve disposed downstream of the first control valve;
- first and second communication fluid lines for fluid communication between the hydraulic actuator and the first control valve;
- and
- a discharge fluid line to discharge the operation fluid from the first control valve to an operation fluid tank,
- wherein the first control valve comprises:
- first and second communication ports connected to the first and second communication fluid lines, respectively:
- first and second input ports through which the operation fluid flows in;
- an output port through which the operation fluid flows out toward the second control valve;
- a discharge port connected to the discharge fluid line;
- a first supply path for fluid communication between the first input port and the second communication port;
- a regeneration path for fluid communication from the first communication port to the first supply path and not to the discharge port;
- and
- a branched path for fluid communication from the regeneration path to the output port and not to the discharge port, and
- wherein the discharge port is disconnected or isolated from the regeneration path and the branched path, to prevent fluid communication from the regeneration path and the branched path to the discharge port, wherein
- the first control valve is configured to be switched between a first position at which the hydraulic actuator retracts and a second position at which the hydraulic actuator extends, and
- the operation fluid having been returned to the first control valve is guided through the second communication port, the discharge port, and the discharge fluid line when the first control valve is at the first position.
15 more elements
Dependencies are inferred from the claim text.