Fluid sprinkling – spraying – and diffusing – With means to vibrate or jiggle discharge – By electric transducer
Reexamination Certificate
2001-04-13
2003-04-08
Mar, Michael (Department: 3752)
Fluid sprinkling, spraying, and diffusing
With means to vibrate or jiggle discharge
By electric transducer
C239S533200, C239S533400, C239S533110, C239S533120, C239S585100
Reexamination Certificate
active
06543702
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to a fuel injector.
BACKGROUND INFORMATION
A fuel injector is described in German Published Application. The fuel injector proceeding from this printed publication has a valve-closure member, which can be actuated by an actuator, via a valve needle, and interacts with a valve-seat surface to form a sealing seat. In this context, the fuel injector has a connection part and a functional part. An electrical connection and a fuel connection are provided at the connection part. The functional part has the actuator, a compression spring, and a valve-seat member, on which the valve-seat surface is formed. Therefore, the entire actuating device necessary to actuate the fuel injector is accommodated in the functional part. In connecting the functional part to the connection part, an electrical contact pin of the functional part is plugged into a socket of the connection part, whereby the actuator is connected to the electrical connection of the connection part. In addition, a fuel channel of the functional part is connected, in a sealed manner, to a fuel channel of the connection part. Because the connection part is bevelled on a connection side, on which it is connected to the functional part, the functional part can be connected to the connection part at a fixed slewing angle.
The fuel injector described in German Published Patent Application No. 197 12 591 has the following disadvantages. Since the actuating device is completely accommodated in the functional part, which is mounted in a tilted manner with respect to the connection part, the valve housing of the fuel injector has a bend in it. This makes it more difficult to insert the fuel injector in a connecting socket of the internal combustion engine, the fuel injector especially not being insertable in a cylindrical connecting socket. In particular, this fuel injector cannot be mounted in a cylindrical, receiving borehole of a cylinder head, as is required with fuel injectors that inject directly into the combustion chamber of an internal combustion engine.
The set-up of the electrical plug connection requires that the tilt angle of the fuel injector be already specified during the manufacture of the connection part. Therefore, tilt angle &agr; can only be changed by modifying the manufacturing method. Since the fuel injector is subdivided into a connection part and a functional part in which the entire actuating device is accommodated, the fuel injector described in this printed publication is only suitable for this special fuel injector.
SUMMARY OF THE INVENTION
In contrast, the fuel injector of the present invention, has the advantage of the tilt angle being adjustable independently of the particular shape of the valve housing, so that the fuel injector can be used universally. In addition, the actuating device can be positioned in the fuel injector, independently of the angular position of the valve needle, so that the present invention is suitable for any fuel injector.
The valve-seat surface is advantageously formed on a valve-seat member, which rests against a spherical connecting surface on a valve housing of the fuel injector. The valve-seat member and the valve housing are thereby matched with each other in a particularly favorable manner, so that the tilt angle does not have to be fixed until the valve-seat member is attached to the valve housing. In this context, it is particularly advantageous when the valve-seat member is designed to be concave at the connecting surface.
It is advantageous when the valve housing has an opening, through which the valve needle protrudes, it being especially advantageous for the stepless adjustment of the tilt angle, when the cross-section of the opening is larger than the cross-section of the valve needle. This allows the valve housing and the valve-seat member to be manufactured independently of the tilt angle to be set, in which case the desired tilt angle can be set individually. Because the valve-seat member is connected to the valve housing by a welded seam, the tilt angle can be set with little outlay from a production engineering standpoint. As an alternative to a welded seam, the valve-seat member can also be attached to the valve housing by a screw cap.
The actuator is advantageously manufactured to be piezoelectric or magnetostrictive, which results in a variable valve-needle lift of the valve needle, and a large actuating force.
It is advantageous that the actuator acts on the valve needle, via an actuating element. As a result, the region of the valve on the discharge side of the fuel injector can be designed to have a narrow shape. This is especially sensible when using the fuel injector as an injection valve for directly injecting fuel into an internal combustion engine, since, in general, only a small mounting space is available at the combustion chamber, in the area of the fastening socket.
An end face of the actuating element advantageously rests against a valve-needle head of the valve needle. In this context, it is advantageous that the actuating side of the actuating element, and/or the valve-needle head is designed to be in the shape of a sphere segment or a lens. This ensures the accuracy of fit between the valve needle and the actuating element, regardless of what the tilt angle is set to.
It is advantageous that the actuator acts on the valve needle, via an actuator casing that seals the actuator. This results in a compact design of the fuel injector.
An end face of the actuator casing advantageously rests against a valve-needle head of the valve needle. In this context, it is advantageous that the end face of the actuator casing, and/or the valve-needle head, is designed to be in the shape of a sphere segment or a lens. This ensures the accuracy of fit between the actuator and the actuating element, regardless of what the tilt angle is set to.
REFERENCES:
patent: 3995813 (1976-12-01), Bart et al.
patent: 4033507 (1977-07-01), Fromel et al.
patent: 6027049 (2000-02-01), Stier
patent: 6092743 (2000-07-01), Shibata et al.
patent: 6308901 (2001-10-01), Nitkiewicz et al.
Kenyon & Kenyon
Mar Michael
Nguyen Dinh Q.
LandOfFree
Fuel injection valve does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Fuel injection valve, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Fuel injection valve will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3044349