Fuel Injection valve

Details Fuel Injection valve Fuel Injection valve

2003-03-25

2004-06-01

Mar, Michael (Department: 3752)

Fluid sprinkling, spraying, and diffusing

Fluid pressure responsive discharge modifier* or flow...

Fuel injector or burner

C239S585100, C239S585500, C251S129180

Reexamination Certificate

active

06742726

ABSTRACT:

FIELD OF THE INVENTION
The present invention relates to a fuel injector.
BACKGROUND INFORMATION
German Published Patent Application No. 198 49 210 has already disclosed a fuel injector for fuel injection systems of internal combustion engines which has a magnet coil, an armature that can be impinged upon by the magnet coil against a return spring in a linear stroke direction, and a valve needle that is joined to a valve-closure member. The armature is movable between a first stop joined to the valve needle that limits motion of the armature in the linear stroke direction, and a second stop joined to the valve needle that limits motion of the armature opposite to the linear stroke direction. A damping spring in the form of a cup spring is positioned between the second stop and the armature.
One of the disadvantages of the fuel injector known from German Published Patent Application No. 198 49 210 is that manufacturing and assembly complexity are increased because of at least one additional component. Another is that, for example because of skewed placement of the cup spring or manufacturing tolerances that occur during production, misalignment or jamming of the armature can occur during operation of the fuel injector. Extreme variations in armature travel and in the height of the pre-stroke gap occur as a consequence. Both factors can result in malfunctions during operation of the fuel injector.
SUMMARY OF THE INVENTION
The fuel injector according to the present invention has, in contrast, the advantage that a pre-stroke of the armature is adjustable, very accurately and with no damage to the components used, by way of a clamping sleeve that can be slid onto the valve needle and positioned as desired.
It is particularly advantageous that a lateral slit in the clamping sleeve makes possible easy installation by way of an elastic preload of the tubular component, the clamping force of the clamping sleeve being selectable, by way of its axial length, to match the weight of the armature.
The particular shape of the conical bevels of the clamping sleeve advantageously ensures that non-damaging installation is possible.
It is especially advantageous that production of the entire component can be accomplished quickly and economically, since the clamping sleeve and the spacer ring are easy to manufacture and no further components are required.


REFERENCES:
patent: 4342427 (1982-08-01), Gray
patent: 5029807 (1991-07-01), Fuchs
patent: 6131829 (2000-10-01), Ricco
patent: 6161813 (2000-12-01), Baumgartner et al.
patent: 6367769 (2002-04-01), Reiter
patent: 6435429 (2002-08-01), Eichendorf et al.
patent: 6450424 (2002-09-01), Horbelt
patent: 198 16 315 (1999-10-01), None
patent: 198 49 210 (2000-04-01), None
patent: 199 27 900 (2000-12-01), None
patent: 1 541 458 (1968-10-01), None

Affiliated with

Also associated with

Rating

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.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-3327316