A shock valve assembly for a hydraulic system includes a fluid path extending between a first port and a second port with a shock valve disposed in the fluid path to normally block fluid flow through the fluid path between the first and second ports. The shock valve temporarily opens to permit fluid
A shock valve assembly for a hydraulic system includes a fluid path extending between a first port and a second port with a shock valve disposed in the fluid path to normally block fluid flow through the fluid path between the first and second ports. The shock valve temporarily opens to permit fluid flow between the first port and a second port through the fluid path when a fluid pressure differential between the ports exceeds a predetermined threshold. Fluid flow occurs in a first direction from the first port to the second port through the fluid path when the shock valve is temporarily opened and fluid pressure in the first port is greater than the second port. Fluid flow occurs in a second, reverse direction through the fluid path from the second port to the first port when the shock valve is temporarily opened and fluid pressure in the second port is greater than the first port.
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The invention claimed is: 1. A shock valve assembly for a hydraulic system, comprising: a fluid path extending between a first port and a second port with a shock valve disposed in said fluid path to normally block fluid flow through said fluid path between said first and second ports, said shock v
The invention claimed is: 1. A shock valve assembly for a hydraulic system, comprising: a fluid path extending between a first port and a second port with a shock valve disposed in said fluid path to normally block fluid flow through said fluid path between said first and second ports, said shock valve temporarily opening to permit fluid flow between said first port and said second port through said fluid path when a fluid pressure differential between said ports exceeds a predetermined threshold, fluid flow occurring in a first direction from said first port to said second port through said fluid path when said shock valve is temporarily opened and fluid pressure in said first port is greater than said second port, and fluid flow occurring in a second, reverse direction through said fluid path from said second port to said first port when said shock valve is temporarily opened and fluid pressure in said second port is greater than said first port, wherein an auxiliary fluid passage fluidly connects to said fluid passage at a location between first and second seat portions of said shock valve. 2. The shock valve assembly of claim 1 wherein said shock valve includes at least one valve plug portion urged toward said first seat portion to normally block fluid communication from said first port to said second port when said fluid pressure in said first port is greater than said second port, said at least one valve plug portion urged toward said second seat portion to normally block fluid communication from said second port to said first port when said fluid pressure in said second port is greater than said first port, said first and second seat portions spaced apart from one another in said fluid flow path. 3. The shock valve assembly of claim 2 wherein said at least one valve plug portion includes a first poppet having a first poppet head portion which seats against said first seat portion when said fluid pressure in said first port is greater than said second port and a second poppet having a second poppet head portion which seats against said second seat portion when said fluid pressure in said second port is greater than said first port, said head portions movable relative to one another. 4. The shock valve assembly of claim 3 further including a biasing member disposed between said head portions to urge said head portions to at least a specific spaced apart distance from one another. 5. The shock valve assembly of claim 2 wherein said auxiliary fluid passage fluidly connects to an auxiliary hydraulic device or component. 6. The shock valve assembly of claim 1 wherein said fluid ports are defined in a hydraulic motor housing. 7. The shock valve assembly of claim 6 wherein said shock valve is disposed entirely within said hydraulic motor housing. 8. The shock valve assembly of claim 1 in combination with a hydraulic motor wherein said hydraulic motor includes a rotor set operatively coupled to a drive shaft and a housing having a central opening in which at least one of said rotor set or said drive shaft is at least partially received, said first port and said second port both defined in said housing and each fluidly connected to said central opening such that hydraulic fluid entered into one of said first and second ports normally passes through said central opening by said rotor set and said drive shaft and exits out the other of said first and second ports. 9. The shock valve assembly of claim 8 wherein a pump is operatively and fluidly connected to said first and second ports for driving said hydraulic motor, said pump operable in a first mode wherein hydraulic fluid is directed into said first port and alternatively in a second mode wherein hydraulic fluid is directed into said second port. 10. A shock valve assembly for a hydraulic system, comprising: a fluid path extending between a first port and a second port; a shock valve disposed in said fluid path to normally block fluid flow through said fluid path between said first and second ports; and at least one valve plug portion of said shock valve urged toward a first seat portion to normally block fluid communication from said first port to said second port when said fluid pressure in said first port is greater than said second port, said at least one valve plug portion urged toward a second seat portion to normally block fluid communication from said second port to said first port when said fluid pressure in said second port is greater than said first port, said first and second seat portions spaced apart from one another in said fluid flow path, said at least one valve plug portion further includes a stem portion extending between and maintaining a minimum spacing between said head portions; wherein said at least one valve plug portion includes a first poppet having a first poppet head portion which seats against said first seat portion when said fluid pressure in said first port is greater than said second port and a second poppet having a second poppet head portion which seats against said second seat portion when said fluid pressure in said second port is greater than said first port, said head portions movable relative to one another; and wherein said shock valve temporarily opening to permit fluid flow between said first port and said second port through said fluid path when a fluid pressure differential between said ports exceeds a predetermined threshold, fluid flow occurring in a first direction from said first port to said second port through said fluid path when said shock valve is temporarily opened and fluid pressure in said first port is greater than said second port, and fluid flow occurring in a second, reverse direction through said fluid path from said second port to said first port when said shock valve is temporarily opened and fluid pressure in said second port is greater than said first port. 11. The shock valve assembly of claim 10 further including a spring annularly received about said stem portion to urge said head portions to at least a specific spaced apart distance from one another. 12. A shock valve assembly for a hydraulic system, comprising: a fluid path extending between a first port and a second port; a shock valve disposed in said fluid path to normally block fluid flow through said fluid path between said first and second ports; said shock valve including at least one valve plug portion urged toward a first seat portion to normally block fluid communication from said first port to said second port when said fluid pressure in said first port is greater than said second port, said at least one valve plug portion urged toward a second seat portion to normally block fluid communication from said second port to said first port when said fluid pressure in said second port is greater than said first port, said first and second seat portions spaced apart from one another in said fluid flow path; said at least one valve plug portion including a first poppet having a first poppet head portion which seats against said first seat portion when said fluid pressure in said first port is greater than said second port and a second poppet having a second poppet head portion which seats against said second seat portion when said fluid pressure in said second port is greater than said first port, said head portions movable relative to one another; and a biasing member disposed between said head portions to urge said head portions to at least a specific spaced apart distance from one another; said shock valve temporarily opening to permit fluid flow between said first port and said second port through said fluid path when a fluid pressure differential between said ports exceeds a predetermined threshold, fluid flow occurring in a first direction from said first port to said second port through said fluid path when said shock valve is temporarily opened and fluid pressure in said first port is greater than said second port, and fluid flow occurring in a second, reverse direction through said fluid path from said second port to said first port when said shock valve is temporarily opened and fluid pressure in said second port is greater than said first port; and wherein said at least one valve plug portion includes a shock fluid passage defined therethrough, fluid communication between said ports occurring through said shock fluid passage when said fluid pressure differential between said ports exceeds said predetermined threshold, a shock fluid passage closure member is received in said shock fluid passage for blocking fluid communication therethrough except when said pressure differential exceeds said predetermined threshold. 13. The shock valve assembly of claim 12 wherein said shock fluid passage closure member includes: a first head portion disposed adjacent one end of said shock fluid passage for blocking fluid passage thereby when seated against said first poppet head portion; a second head portion disposed adjacent another end of said shock fluid passage for blocking fluid passage thereby when seated against said second poppet head portion; and a stem portion extending between and connecting said first and second head portions, said stem portion received in said shock fluid passage, wherein said first head portion is movable apart from said first poppet head portion by causing said second head portion to move said second poppet head portion toward said first poppet head portion by overcoming urging of said biasing member when fluid pressure in said second port is greater than said first port such that said fluid pressure differential between said first port and said second port exceeds said predetermined threshold, and wherein said second head portion is movable apart from said second poppet head portion by causing said first head portion to move said first poppet head portion toward said second poppet head portion by overcoming urging of said biasing member when fluid pressure in said first port is greater than said second port such that said fluid pressure differential between said second port and said first port exceeds said predetermined threshold. 14. The shock valve assembly of claim 12 wherein spacing between said first and second closure member head portions defines a maximum amount of spacing between said first and second poppet members. 15. The shock valve assembly of claim 12 wherein said first head portion and said stem portion are together formed as a fastener having a threaded region located on said stem portion, said second head portion formed as a threaded member threadedly received on said threaded region, said spacing between said first and second head portions adjustable by moving said threaded member along said threaded region of said stem portion to thereby adjust said maximum amount of spacing between said first and second poppet members. 16. A valve assembly for a hydraulic system, comprising: a fluid path extending between a first port and a second port with a valve disposed in said fluid path to block fluid flow through said fluid path between said first and second ports, said valve including at least one valve plug portion urged toward a first seat portion to block fluid communication from said first port to said second port when said fluid pressure in said first port is greater than said second port, said at least one valve plug portion urged toward a second seat portion to block fluid communication from said second port to said first port when said fluid pressure in said second port is greater than said first port, said first and second seat portions spaced apart from one another in said fluid path, an auxiliary fluid passage fluidly connecting to said fluid passage at a location between said first and second seat portions. 17. The valve assembly of claim 16 wherein said at least one valve plug portion includes a first valve member urged toward said first seat portion to block fluid communication from said first port to said second port and includes a second member urged toward said second seat portion to block fluid communication from said second port to said first port, and further includes a spring disposed between said first and second members for urging each of said first and second members against said respective first and second seat portions. 18. A hydraulic motor having a shock absorbing valve assembly, comprising: a rotor set operatively coupled to a drive shaft; a housing having a central opening in which at least one of said rotor set or said drive shaft is at least partially received; a first port and a second port defined in said housing and each fluidly connected to said central opening such that hydraulic fluid entered into one of said first and second ports normally passes through said central opening by said rotor set and said drive shaft and exits out the other of said first and second ports; and a short-circuit fluid passage fluidly connected directly to said first port and said second port for selectively passing hydraulic fluid directly between said ports to absorb pressure shocks; and a bi-directional valve assembly disposed within said fluid passage for selectively allowing fluid communication from said first port to said second port when the motor is operating in a first direction and selectively allowing fluid communication from said second port to said first port when the motor is operating in a second reverse direction, selective allowance of fluid communication between said first and second ports through said bi-directional valve occurring when a pressure differential between said first and second ports exceeds a predetermined threshold and until said pressure differential is below said predetermined threshold, said bi-directional valve assembly including: a first poppet head portion seated against a corresponding first seat portion when fluid pressure in said first port exceeds fluid pressure in said second port, a second poppet head portion seated against a corresponding second seat portion when fluid pressure in said second port exceeds fluid pressure in said first port, at least one of said first and second poppet head portions having a shock fluid passage defined therethrough, and a shock fluid passage closure member received in said shock fluid passage in a closed position to block fluid communication therethrough and temporarily movable to an open position when said pressure differential between said first and second ports exceeds said predetermined threshold. 19. The hydraulic motor of claim 18 wherein said bi-directional valve assembly is generally in a closed state when said pressure differential is less than predetermined threshold, said bi-directional valve assembly blocking fluid communication between said ports through said short-circuit fluid passage when in said closed state. 20. The hydraulic motor of claim 18 further including a biasing member disposed between said head portions to urge said head portions apart, said closure member movable to said open position with an unseated one of said first and second head portions against an urging of said biasing member when said pressure differential exceeds said predetermined threshold and urged to said closed position by said biasing member. 21. The hydraulic motor of claim 20 wherein said closure member is adjustable to selectively move said head portions toward one another a selected distance against said urging of said biasing member and thereby adjust said predetermined threshold. 22. The hydraulic motor of claim 18 wherein said bi-directional valve assembly includes at least one valve plug portion having a first poppet with a first poppet head portion which seats against a first seat portion when said fluid pressure in said first port is greater than said second port and a second poppet with a second poppet head portion which seats against a second seat portion when said fluid pressure in said second port is greater than said first port, said at least one valve plug portion further including a stem portion extending between and maintaining a minimum spacing between said head portions. 23. The hydraulic motor of claim 18, wherein said short-circuit fluid passage and said bi-directional valve assembly are disposed entirely within said hydraulic motor. 24. A hydraulic motor having a shock absorbing valve assembly, comprising: a rotor set operatively coupled to a drive shaft; a housing having a central opening in which at least one of said rotor set or said drive shaft is at least partially received; a first port and a second port defined in said housing and each fluidly connected to said central opening such that hydraulic fluid entered into one of said first and second ports normally passes through said central opening by said rotor set and said drive shaft and exits out the other of said first and second ports; and a short-circuit fluid passage fluidly connected directly to said first port and said second port for selectively passing hydraulic fluid directly between said ports to absorb pressure shocks; a bi-directional valve assembly disposed within said fluid passage for selectively allowing fluid communication from said first port to said second port when the motor is operating in a first direction and selectively allowing fluid communication from said second port to said first port when the motor is operating in a second reverse direction, selective allowance of fluid communication between said first and second ports through said bi-directional valve occurring when a pressure differential between said first and second ports exceeds a predetermined threshold and until said pressure differential is below said predetermined threshold; and an auxiliary fluid passage fluidly connected to said fluid passage between said first port and said second port, said first port in fluid communication with said auxiliary fluid passage when fluid pressure is greater in said first port than said second port, and said second port in fluid communication with said auxiliary fluid passage when fluid pressure in said second port is greater than said first port.
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이 특허에 인용된 특허 (15)
Wall Gerald E. (Culpeper VA), Adjustable valve assembly.
Jacobson,Robert D.; French,Nathan H.; Huynh,Tam C.; Lodermeier,Christopher M.; Behm,Brian W., Cross-over relief valve assembly for use in bi-directional circuit.
Arai Mitsuru (Kamakura JPX) Sato Hideyori (Funabashi JPX) Inatomi Shoichiro (Yokohama JPX), Fluid circuit for operating a bidirectional hydraulic motor with a reduced shock.
Dennis J. Heyne ; Richard J. Lech ; Eric Sharkness, Hydraulic system and method for regulating pressure equalization to suppress oscillation in heavy equipment.
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