IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0426830
(2003-05-01)
|
우선권정보 |
JP-0212439 (2002-07-22) |
발명자
/ 주소 |
|
출원인 / 주소 |
|
대리인 / 주소 |
|
인용정보 |
피인용 횟수 :
8 인용 특허 :
3 |
초록
▼
An air vent mechanism includes a composite type air vent valve having a check valve for controlling a pressure in a fuel tank and a cut valve for discharging vapor in the fuel tank and preventing fuel from leaking. The check valve and the cut valve are connected through a communicating path. A tank
An air vent mechanism includes a composite type air vent valve having a check valve for controlling a pressure in a fuel tank and a cut valve for discharging vapor in the fuel tank and preventing fuel from leaking. The check valve and the cut valve are connected through a communicating path. A tank side connecting portion communicates with the communicating path, and an atmosphere side connecting portion communicates with an atmosphere side port of the check valve portion.
대표청구항
▼
1. A composite type air vent valve situated between a canister and a fuel tank, comprising:a check valve having a first tank side port and a first atmosphere side port for opening and closing a connection between the first tank side port and the first atmosphere side port according to an inner press
1. A composite type air vent valve situated between a canister and a fuel tank, comprising:a check valve having a first tank side port and a first atmosphere side port for opening and closing a connection between the first tank side port and the first atmosphere side port according to an inner pressure of the fuel tank;a cut valve having a second tank side port and a second atmosphere side port, said cut valve generally opening a connection between the second tank side port and the second atmosphere side port to discharge vapor in the fuel tank and closing the connection between the second tank side port and the second atmosphere side port according to a fuel liquid level in the fuel tank; anda case member attachable on an outer surface of the fuel tank, said case member comprising:an atmosphere side connecting portion to be connected to the canister and communicating with the first atmosphere side port of the check valve;a communicating path for communicating the first tank side port of the check valve with the second atmosphere side port of the cut valve;a tank side connecting portion to be connected to another cut valve and communicating with the communicating paths;a check valve-attaching portion communicating with the atmosphere side connecting portion for retaining the check valve therein; anda cut valve-attaching portion disposed under the check valve-attaching portion for retaining the cut valve therein. 2. A composite type air vent valve as claimed in claim 1, wherein said check valve includes a check valve case having a lower end provided with the first tank side port, an upper end provided with the first atmosphere side port, and a check valve seat formed at an inner peripheral edge of the first atmosphere side port; a valve member disposed in the check valve case to be movable vertically and including a hollow body having a lower end in a funnel shape with a lower opening, and an upper end having a valve head with an upper opening; a valve ball disposed in the valve member for closing the lower opening; and an urging device situated under the valve member for urging the valve member upward to close the first atmosphere side port. 3. A composite type air vent valve as claimed in claim 2, wherein said valve member, valve ball and urging means are arranged such that normally, the lower opening is closed by the valve ball, and the valve member is located at an upper moving limit by the urging device to close the first atmosphere side port; when a pressure at the first tank side port becomes a predetermined high pressure, a space is formed between the lower end wall and the valve ball to communicate the first tank side port with the first atmosphere side port through the upper and lower openings of the valve member; and when a pressure at the first tank side port becomes a predetermined reduced pressure, the valve member is moved downward against the urging force of the urging device to thereby communicate the first tank side port with the first atmosphere side port. 4. A composite type air vent valve as claimed in claim 1, wherein said cut valve includes a cut valve case having a lower end provided with the second tank side port, an upper end provided with the second atmosphere side port, and a cut valve seat formed at an inner peripheral edge of the second atmosphere side port; and a floating member disposed in the cut valve case to be movable vertically and having a valve head at an upper end thereof so that the floating member rises to close the second atmosphere side port only when fuel enters the cut valve case portion. 5. An air vent mechanism comprising a fuel tank, the composite type air vent valve as claimed in claim 1 and attached to the fuel tank, at least one cut valve attached to the fuel tank and connected to the tank side connecting portion of the composite type air vent valve, and a canister connected to the atmosphere side connecting portion. 6. An air vent mechanism as claimed in claim 5, wherein sai d at least one cut valve includes a third tank side port and a third atmosphere side port, said at least one cut valve opening a connection between the third tank side port and the third atmosphere side port to discharge a vapor in the fuel tank in a normal state and closing the connection between the third tank side port and the third atmosphere side port when a fuel liquid surface in the fuel tank exceeds a predetermined level, said at least one cut valve projecting into the fuel tank through an attaching hole formed in the fuel tank when the at least one cut valve is attached to the fuel tank. 7. An air vent mechanism as claimed in claim 5, wherein said at least one cut valve further includes a cut valve case having a lower end provided with the third tank side port, an upper end provided with the third atmosphere side port, and a cut valve seat formed at an inner peripheral edge of the third atmosphere side port; and a floating member disposed in the cut valve case to be movable vertically and having a valve head at an upper end thereof so that the floating member rises to close the third atmosphere side port only when fuel enters the cut valve case portion. 8. A composite type air vent valve as claimed in claim 1, wherein said check valve is installed in the check valve-attaching portion as one unit, and the cut valve is installed in the cut valve-attaching portion as one unit, said check valve and said cut valve defining said communicating path therebetween. 9. A composite type air vent valve as claimed in claim 8, wherein said case member further includes an arc-shaped partition to form the check valve-attaching portion and a semicircular arc-shaped space between said check valve-attaching portion and an inner peripheral surface of said case member. 10. A composite type air vent valve as claimed in claim 9, wherein said semicircular arc-shaped space communicates the tank side connecting portion with the communicating path. 11. A composite type air vent valve as claimed in claim 9, wherein said check valve includes, as one unit, a check valve case having a lower end provided with the first tank side port, an upper end provided with the first atmosphere side port, and a check valve seat formed at an inner peripheral edge of the first atmosphere side port; a valve member disposed in the check valve case to be movable vertically and including a hollow body having a lower end in a funnel shape with a lower opening, and an upper end having a valve head with an upper opening; a valve ball disposed in the valve member for closing the lower opening; and an urging device situated under the valve member for urging the valve member upward to close the first atmosphere side port, andsaid cut valve includes, as one unit, a cut valve case having a lower end provided with the second tank side port, an upper end provided with the second atmosphere side port, and a cut valve seat formed at an inner peripheral edge of the second atmosphere side port; and a floating member disposed in the cut valve case to be movable vertically and having a valve head at an upper end thereof so that the floating member rises to close the second atmosphere side port only when fuel enters the cut valve case portion.
※ AI-Helper는 부적절한 답변을 할 수 있습니다.