IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0385503
(2003-03-12)
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발명자
/ 주소 |
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출원인 / 주소 |
|
대리인 / 주소 |
Finnegan, Henderson, Farabow, Garrett & Dunner
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인용정보 |
피인용 횟수 :
3 인용 특허 :
8 |
초록
▼
A velocity control system for an engine valve is provided. The system includes a valve having a housing defining an opening, a chamber adapted to receive a fluid, a first fluid passageway connecting the opening with the chamber, a second fluid passageway connecting the opening with the chamber, and
A velocity control system for an engine valve is provided. The system includes a valve having a housing defining an opening, a chamber adapted to receive a fluid, a first fluid passageway connecting the opening with the chamber, a second fluid passageway connecting the opening with the chamber, and a third fluid passageway connecting the opening with the chamber. A piston is slidably disposed in the chamber and is moveable from a first position to a second position. The movement of the piston from the first position to the second position forces fluid from the chamber at a first flow rate during movement of the piston through a first travel distance and at a second flow rate during movement of the piston through a second travel distance. The first flow rate is greater than the second flow rate. A check valve is adapted to prevent fluid from flowing from the chamber through the first fluid passageway when the piston is moving from the first position to the second position.
대표청구항
▼
1. A velocity control system, comprising:a housing defining an opening, a chamber adapted to receive a fluid, a first fluid passageway connecting the opening with the chamber, a second fluid passageway connecting the opening with the chamber, and a third fluid passageway connecting the opening with
1. A velocity control system, comprising:a housing defining an opening, a chamber adapted to receive a fluid, a first fluid passageway connecting the opening with the chamber, a second fluid passageway connecting the opening with the chamber, and a third fluid passageway connecting the opening with the chamber;a piston slidably disposed in the chamber and moveable from a first piston position to a second piston position, the movement of the piston from the first piston position to the second piston position forcing fluid from the chamber at a first flow rate during movement of the piston through a first travel distance and at a second flow rate during movement of the piston through a second travel distance, wherein the first flow rate is greater than the second flow rate;a check valve adapted to prevent fluid from flowing from the chamber through the first fluid passageway when the piston is moving from the first piston position to the second piston position; anda control valve in fluid communication with the opening and having a first position where fluid is allowed to flow from the chamber and a second position where fluid is selectively blocked from flowing from the chamber. 2. The system of claim 1, wherein the piston blocks the second fluid passageway after the piston moves through the first travel distance to thereby prevent fluid from flowing from the chamber through the second fluid passageway. 3. The system of claim 1, wherein the second fluid passageway is configured to allow a greater flow of fluid than the third fluid passageway. 4. The system of claim 1, wherein the check valve includes a ball operatively engageable with a first seat and a second seat and wherein engagement of the ball with the first seat prevents a flow of fluid through the first fluid passageway. 5. The system of claim 4, wherein the ball engages the first seat when the piston is moving from the first piston position to the second piston position. 6. The system of claim 4, wherein the second seat of the check valve has at least one passageway adapted to allow fluid to flow from the first fluid passageway to the chamber when the ball is engaged with the second seat. 7. The system of claim 1, wherein fluid flows from the opening to the chamber through each of the first, second, and third fluid passageways when the piston moves from the second piston position towards the first piston position. 8. The velocity control system of claim 1, wherein the flow of fluid from the chamber is selectively blocked to stop movement of the piston at a position between the first piston position and the second piston position. 9. A velocity control system, comprising:a housing defining an opening, a chamber adapted to receive a fluid, a first fluid passageway connecting the opening with the chamber, a second fluid passageway connecting the opening with the chamber, and a third fluid passageway connecting the opening with the chamber;a piston slidably disposed in the chamber and moveable from a first position to a second position;a first valve means for releasing fluid from the chamber at a first flow rate during movement of the piston through a first travel distance between the first position and the second position and for releasing fluid from the chamber at a second flow rate during movement of the piston through a second travel distance between the first position and the second position;a second valve means for preventing fluid from flowing from the chamber through the first fluid passageway when the piston is moving from the first position to the second position; anda third valve means for selectively preventing fluid from flowing from the chamber through the opening. 10. The system of claim 9, wherein the second valve means includes a check valve. 11. The system of claim 10, wherein the check valve includes a ball operatively engageable with a first seat to prevent a flow of fluid through the first fluid passageway and a second seat having at least one passage way adapted to allow fluid to flow from the first fluid passageway to the chamber when the ball is engaged with the second seat. 12. The velocity control system of claim 9, wherein the flow of fluid from the chamber is selectively blocked to stop movement of the piston at a position between the first position and the second position. 13. A method of controlling the velocity of an engine valve, comprising:operating a cam assembly to move an engine valve between a first position where the engine valve prevents a flow of fluid and a second position where the engine valve allows a flow of fluid;moving a piston from a first position to a second position to operatively engage an end of the piston with the engine valve to prevent the engine valve from returning to the first position, this piston being slidably disposed in a chamber of a housing;providing fluid to the chamber through a first fluid passageway, a second fluid passageway, and a third fluid passageway in the housing during movement of the piston from the first position to the second position;releasing fluid from the chamber at a first flow rate during movement of the piston through a first travel distance from the second position to the first position; andreleasing fluid from the chamber at a second flow rate during movement of the piston through a second travel distance from the second position to the first position, and second flow rate being less than the first flow rate. 14. The method of claim 13, wherein fluid is released through the second and third fluid passageways during movement of the piston through the first travel distance. 15. The method of claim 14, wherein second fluid passageway is blocked and fluid is released through the third fluid passageway during movement of the piston through the second travel distance. 16. The method of claim 13, further including preventing fluid from flowing through the first fluid passageway when the piston moves from the second position to the first position. 17. An engine valve actuation system, comprising:an engine valve moveable between a first position to prevent a flow of fluid and a second position to allow a flow of fluid;a cam assembly connected to move the engine valve between the first position and the second position;a housing defining an opening, a chamber adapted to receive a fluid, a first fluid passageway connecting the opening with the chamber, a second fluid passageway connecting the opening with the chamber, and a third fluid passageway connecting the opening with the chamber;a piston having an end and being slidably disposed in the chamber for movement between a first position where the end is operatively engageable with the engine valve and a second position, the movement of the piston from the first position to the second position forcing fluid from the chamber at a first flow rate during movement of the piston through a first travel distance and at a second flow rate during movement of the piston through a second travel distance, wherein the first flow rate is greater than the second flow rate; anda check valve adapted to prevent fluid from flowing from the chamber through the first fluid passageway when the piston is moving from the first position to the second position. 18. The system of claim 17, wherein the piston blocks the second fluid passageway after the piston moves through the first travel distance to thereby prevent fluid from flowing from the chamber through the second fluid passageway. 19. The system of claim 17, wherein the second fluid passageway is configured to allow a greater flow of fluid than the third fluid passageway. 20. The system of claim 17, wherein the check valve includes a ball operatively engageable with a first seat and a second seat and wherein engagement of the ball with the first seat prevents a flow of fluid through the first fluid passageway. 21. The system of claim 20, wherein the second seat of the check valve has at least one passageway adapted to allow fluid to flo w from the first fluid passageway to the chamber when the ball is engaged with the second seat. 22. The system of claim 17, wherein fluid flows from the opening to the chamber through each of the first, second, and third fluid passageways when the piston moves from the second position towards the first position.
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