Fuel injection valve for internal combustion engines

Details Fuel injection valve for internal combustion engines Fuel injection valve for internal combustion engines

2000-07-07

2001-05-15

Moulis, Thomas N. (Department: 3747)

Internal-combustion engines

Charge forming device

Fuel injection system

Reexamination Certificate

active

06230686

ABSTRACT:

PRIOR ART
The invention relates to a fuel injection valve for internal combustion engines.
One such fuel injection valve is disclosed in German Patent Disclosure DE 19 605 956 A1, for example.
In this fuel injection valve disposed axially secured on the shaft of the valve body, so that the valve is assured that it can be removed from the receiving bore jointly with the valve body of the injection valve. To that end, the sealing ring is fastened by frictional engagement on the valve body shaft, and this frictional engagement is built up preferably only in portions that are distributed symmetrically over the circumference. These portions are in particular three radially inward-protruding formed-on features of the inner wall surface of the sealing ring whose cross-section is reduced compared with the thickness of the sealing ring. The sealing ring then holds by being pressed down on. Since the sealing ring now comprises a very soft material, in particular copper, the inward-protruding formed-on features cannot be prevented from being at least partly ground down on being mounted on the shaft part of the valve body, in which case they will clamp only lightly. Because of this light clamping, the sealing ring can undesirably come loose from the shaft part of the valve body.
The object of the invention is therefore to refine a fuel injection valve for internal combustion engines of the type defined generically above such that on the one hand, the sealing ring can be mounted in a simple way on the shaft part of the valve body and can be secured on the sealing ring in such a way that unintended loosening of the sealing ring from the shaft part can practically no longer occur.
ADVANTAGES OF THE INVENTION
This object is attained, in a fuel injection valve for internal combustion engines of the type described at the outset, according to the invention, the sealing ring has a central opening, which is deformable in a defined way after being slipped onto the shaft part of the valve body. Such an embodiment of the sealing ring has the advantage that on the one hand, because of the central circular opening, the sealing ring can be slipped easily over the valve shaft and can then be deformed with a pressing tool in such a way that at the points of the deformation the sealing ring flows toward the shaft part of the valve member, is forced into the ground surface of the shaft part, and is thus held solidly and in captive fashion thereon. To assure the most uniform possible distribution of force both on the sealing ring and on the shaft part of the valve member, it is advantageously provided that the sealing ring is deformed only in portions of its inner wall surface of the central circular opening, and these portions are preferably distributed uniformly over the circumference of the sealing ring.
An especially advantageous embodiment provides that the sealing ring is preferably deformed at three points distributed uniformly over its circumference.
To enable easy deformation of the sealing ring and in particular to assure that the shaft part of the valve body will not be deformed, the sealing ring is advantageously made from a softer material than the valve body, preferably from copper.
The fastening of the sealing ring on the shaft part of a fuel injection valve of the type described above is advantageously effected in that the sealing ring, after being slipped over the shaft part, is deformed with a pressing tool in such a way that a flow of material toward the shaft part occurs.
As a result, in particular in an especially advantageous way, the sealing ring is prevented from grinding in any way on the shaft part of the valve body as it is being slipped onto the shaft part, thus averting the wear phenomena as described above.


REFERENCES:
patent: 3038456 (1962-06-01), Dreisin
patent: 3382851 (1968-05-01), Luca
patent: 4133321 (1979-01-01), Hofmann
patent: 4528959 (1985-07-01), Hauser, Jr.
patent: 4589596 (1986-05-01), Stumpp et al.
patent: 5129658 (1992-07-01), Berton et al.
patent: 6119658 (2000-09-01), Jahle et al.

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