IPC분류정보
| 국가/구분 |
United States(US) Patent
등록
|
| 국제특허분류(IPC7판) |
|
| 출원번호 |
US-0169945
(1998-10-13)
|
| 우선권정보 |
DE-0044723 (1997-10-10) |
|
발명자
/ 주소 |
- Heinz Rudolf,DEX
- Potschin Roger,DEX
- Schmoll Klaus-Peter,DEX
- Boecking Friedrich,DEX
|
| 출원인 / 주소 |
|
| 대리인 / 주소 |
|
| 인용정보 |
피인용 횟수 :
16 인용 특허 :
8 |
초록
▼
A fuel device which has a high-pressure fuel source from which a number of fuel injection valves, which are each controlled by a 3-way valve, are supplied with fuel. This 3-way valve has a valve member with a closing body provided with sealing faces that cooperates with valve seats and in addition,
A fuel device which has a high-pressure fuel source from which a number of fuel injection valves, which are each controlled by a 3-way valve, are supplied with fuel. This 3-way valve has a valve member with a closing body provided with sealing faces that cooperates with valve seats and in addition, in its closed positions, defines pressure-exposed surfaces that produce resulting forces that are active in the respective closed position of the closing body.
대표청구항
▼
[ We claim:] [1.] A fuel injection device for an internal combustion engine, comprising a high-pressure fuel source (8) to which a fuel injection valve (14) is attached, said valve has an injection valve member (21) for controlling an injection opening (25), and a control chamber (36), said chamber
[ We claim:] [1.] A fuel injection device for an internal combustion engine, comprising a high-pressure fuel source (8) to which a fuel injection valve (14) is attached, said valve has an injection valve member (21) for controlling an injection opening (25), and a control chamber (36), said chamber is defined by a moving wall (34) at least indirectly connected to the fuel injection valve member (21), a supply conduit (53) by way of which a high-pressure source (8) is connected to the control chamber (36), a discharge conduit (57) by way of which the control chamber (36) is connected to a relief chamber (6), wherein the connections mentioned to and from the control chamber can be controlled by way of a valve (40) that has a valve member (43) with a closing body (42) which is provided with two conical sealing faces and can be moved in a valve chamber (41), which closing body is disposed coaxial to two valve seats (54, 55), and depending on the position, comes into sealed contact with the first or second of its sealing surfaces against the corresponding first or second of the valve seats, and the valve chamber continuously communicates with the control chamber (36) by way of a conduit (37), a tappet (45) that is moved by an electrically actuated adjusting drive (59) and is connected to the closing body (42), by means of said tappet, the closing body (42) is moved between the valve seats (54, 55), and said tappet is guided in a guide bore (50) that is connected coaxially to the one of the valve seats (54), wherein a part (48) of the tappet (45) adjacent to the closing body (42) is reduced in diameter and a through flow conduit (51) with an annular cross section is formed between this part of the tappet and the wall of the guide bore (50), which ends at one of the valve seats, and the supply conduit feeds into this through flow conduit and the discharge conduit leads coaxially away from this through flow conduit, adjacent to the other of the valve seats (55), wherein a first annular surface (RF1) that acts in the axial direction of the tappet is formed between the part of the tappet oriented toward the valve chamber and the diametrically reduced part of the tappet (45) and a second annular surface (RF2) that acts in the axial direction is formed between the diametrically reduced part of the tappet and the first sealing edge defined by the placement of the first sealing face against the first valve seat, and that furthermore, the diameter of the guide bore has a first circular surface (KF1) and this circular surface defines a second circular surface (KF2) from the circumference of a second sealing face formed when the second sealing face (47) rests on the second valve seat (54), the forces on the valve member that are produced by the pressure load of the circular surfaces (KF1, KF2) and the annular surfaces (RF1, RF2) are of such magnitude that in the end positions of the closing body (42) at the one or the other of the valve seats (54, 55), a resulting force is produced in the direction of the respective valve seat in the closed position.
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