IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0306755
(2007-06-06)
|
등록번호 |
US-8230829
(2012-07-31)
|
우선권정보 |
FI-20065460 (2006-06-30) |
국제출원번호 |
PCT/FI2007/050332
(2007-06-06)
|
§371/§102 date |
20081229
(20081229)
|
국제공개번호 |
WO2008/000899
(2008-01-03)
|
발명자
/ 주소 |
- Sundsten, Magnus
- Niinikangas, Saku
- Autio, Jussi
|
출원인 / 주소 |
|
대리인 / 주소 |
Chernoff, Vilhauer, McClung & Stenzel, LLP
|
인용정보 |
피인용 횟수 :
0 인용 특허 :
3 |
초록
▼
A control arrangement for a gas exchange valve in a piston engine adapted between the camshaft of the engine and the valve mechanism, which control arrangement comprises a body part and a chamber arranged therein, into which chamber a connection for hydraulic medium opens and in which a piston devic
A control arrangement for a gas exchange valve in a piston engine adapted between the camshaft of the engine and the valve mechanism, which control arrangement comprises a body part and a chamber arranged therein, into which chamber a connection for hydraulic medium opens and in which a piston device is arranged in force transmission connection with the camshaft and the valve mechanism. The connection for hydraulic medium opens to a space in the chamber, which space increases as the piston device moves in the opening direction of the valve, whereby hydraulic medium is arranged to flow into the space, when the valve is being opened, and out of the space, when the valve is being closed.
대표청구항
▼
1. A control arrangement for installation in a piston engine having a camshaft and a valve mechanism for controlling a gas exchange valve of the piston engine, said control arrangement comprising: a body part defining a chamber into which at least one passage for conveying hydraulic medium opens, an
1. A control arrangement for installation in a piston engine having a camshaft and a valve mechanism for controlling a gas exchange valve of the piston engine, said control arrangement comprising: a body part defining a chamber into which at least one passage for conveying hydraulic medium opens, anda piston device disposed in the chamber, the piston device being in mechanical force transmission connection with the camshaft and the valve mechanism at least for opening the valve, the piston device being disposed between the camshaft and the valve mechanism with respect to mechanical force transmission from the camshaft to the valve mechanism,and wherein the passage for conveying hydraulic medium opens selectively into a space in the chamber for supplying hydraulic medium to said space, which space increases in volume as the piston device moves in an opening direction of the valve, whereby hydraulic medium flows into the space while the valve is being opened,and releasing of pressure in said space determines closing of the valve, whereby closing of the valve is delayed. 2. A control arrangement according to claim 1, wherein the body part includes a partition wall, ends of said space are defined by a first portion of the piston device and said partition wall, and sides of said space are defined by the body part and a second portion of the piston device. 3. A control arrangement according to claim 1, wherein the flow resistance of the hydraulic medium in the passage is lower while the hydraulic medium is flowing into the space, than the flow resistance while the hydraulic medium is flowing out of the space. 4. A control arrangement according to claim 3, comprising a throttle device for resisting flow of hydraulic medium out of said space. 5. A control arrangement according to claim 1, wherein said at least one passage comprises a feed conduit for supply of hydraulic medium to said space and a separate discharge conduit for discharging hydraulic medium from said space. 6. A control arrangement according to claim 5, comprising a flow throttling device for resisting flow of hydraulic medium through the discharge conduit. 7. A control arrangement according to claim 6, wherein the throttling device comprises a control device for throttling effect. 8. A control arrangement for installation in a piston engine having a camshaft and a valve mechanism for controlling a gas exchange valve of the piston engine, said control arrangement comprising: a body part defining a chamber into which at least one passage for conveying hydraulic medium opens, anda piston device disposed in the chamber, the piston device being in mechanical force transmission connection with the camshaft and the valve mechanism at least for opening the valve,and wherein the passage for conveying hydraulic medium opens selectively into a space in the chamber for supplying hydraulic medium to said space, which space increases in volume as the piston device moves in an opening direction of the valve, whereby hydraulic medium flows into the space while the valve is being opened,and releasing of pressure in said space determines closing of the valve, whereby closing of the valve is delayed, and wherein the control arrangement further comprises a guide portion providing force transmission connection between the piston device and the camshaft, and a valve device controlling flow of hydraulic medium in a discharge conduit for discharging hydraulic medium from said space, and wherein operation of the valve device is dependent on the position of the guide portion relative to the body part. 9. A control arrangement according to claim 8, wherein the body part defines a cavity that extends parallel to the chamber and the valve device comprises a guide member that is disposed in said cavity and follows movement of said guide portion, said guide member being formed with an aperture that is selectively placed in alignment with the discharge conduit depending on the position of the guide portion relative to the body part. 10. A method of controlling a gas exchange valve in a piston engine having a camshaft and a valve mechanism for controlling the gas exchange valve, utilizing a control arrangement that is disposed between the camshaft and the valve mechanism with respect to mechanical force transmission from the camshaft to the valve mechanism and comprises a body part defining a space into which at least one passage for hydraulic medium opens and in which a piston device is arranged in mechanical force transmission connection with the camshaft and the valve mechanism at least for opening the valve, wherein the method comprises: during an opening phase of the valve, allowing flow of hydraulic medium into said space,during a closing phase of the valve, restricting flow of hydraulic medium from said space, whereby closing of the valve is delayed, andthrottling outflow of the hydraulic medium from said space when the hydraulic medium flows away from the control arrangement. 11. A piston engine comprising: a gas exchange valve,a valve mechanism for controlling the valve,a camshaft in force transmission connection with the valve mechanism for selectively opening the valve and allowing the valve to close, anda control arrangement disposed operatively between the gas exchange valve and the camshaft and comprising a body part defining a chamber into which at least one passage for conveying hydraulic medium opens, and a piston device disposed in the chamber, the piston device being in mechanical force transmission connection with the camshaft and the valve mechanism at least for opening the valve, the piston device being disposed between the camshaft and the valve mechanism with respect to mechanical force transmission from the camshaft to the valve mechanism,and wherein the passage for conveying hydraulic medium opens selectively into a space in the chamber for supplying hydraulic medium to said space, which space increases in volume as the piston device moves in an opening direction of the valve, whereby hydraulic medium flows into the space while the valve is being opened,and the control arrangement further comprises a flow restricting element for restricting flow of hydraulic medium from said space whereby closing of the valve is delayed. 12. A piston engine according to claim 11, wherein the camshaft includes at least one profile element, the control arrangement comprises a guide element that engages the profile element and a spring effective between the body part and the guide element and urging the guide element into contact with the profile element, during an opening phase of the valve movement the guide element engages the piston device for moving the piston device in one direction relative to the body part, and during a closing phase of the valve movement the spring maintains the guide element in contact with the profile element while pressure of hydraulic fluid in said space resists movement of the piston device in an opposite direction relative to the body part, thereby delaying closing of the valve relative to movement of the guide element.
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