Electromagnetically actuatable fuel injection valve

Details Electromagnetically actuatable fuel injection valve Electromagnetically actuatable fuel injection valve

1992-01-31

1993-03-02

Kashnikow, Andres

Fluid sprinkling, spraying, and diffusing

Flow deflecting or rotation controlling means

Fluid rotation inducing means upstream of outlet

2395851, B05B 134, F02U 5108

Patent

active

051902214

DESCRIPTION:

BRIEF SUMMARY
BACKGROUND OF THE INVENTION

The invention is based on an electromagnetically actuatable fuel injection valve as defined hereinafter. European Patent Disclosure 0 350 885 A2 has already disclosed an electromagnetically actuatable fuel injection valve that has an inner pole, surrounded by a magnet coil, and an armature that is oriented toward the inner pole and is joined to a ball serving as a valve closing body. The ball is slidably supported in a guide bore and cooperates with a fixed valve seat. Since the ball is slidably supported over its entire circumference in the guide bore, the fuel must be guided around the outside circumference of the swirl element having the guide bore. As a result, the known fuel injection valve has a large outside diameter, so that the compactness demanded for fuel injection valves cannot be attained.


ADVANTAGES OF THE INVENTION

The electromagnetically actuatable fuel injection valve according to the invention has an advantage over the prior art of a particularly compact structural form, with an especially small outside diameter, since the fuel can flow directly to the valve seat, through the blind bore and the at least one transverse conduit in the ball acting as a valve closing body.
In addition, the blind bore and the at least one transverse conduit reduce the weight of the ball acting as the valve closing body, which improves the response behavior of the fuel injection valve.
In comparison with known fuel injection valves, the fuel injection valve of the invention has a smaller number of structural parts, making for economical manufacture.
Advantageous further developments of and improvements to the valve disclosed are attainable with the provisions recited hereinafter.
For delivering the fuel to the valve seat, it is advantageous if the at least one transverse conduit discharges into an encompassing recess that is formed in the axial direction between the upstream guide bore, oriented toward the armature, and the downstream valve seat. The recess serves at the same time as a fuel collecting chamber and thus enables reliable injection of the fuel as the ball acting as the valve closing body rises from the fixed valve seat of the fuel injection valve.
It is especially advantageous if the armature and the ball are joined directly to one another, resulting in a very low weight of the valve element comprising the armature and the ball. This makes for faster switching times and less wear on the fuel injection valve and reduces the demands made of the magnetic circuit.
It is advantageous if the at least one transverse conduit discharges at a tangent into the encompassing recess, generating a swirl. As the fuel is injected, for instance into an intake tube of an internal combustion engine, the swirl improves the formation of the fuel-gas mixture.
It is advantageous if a lower pole end, toward the armature, of the inner pole is tightly joined on its circumference to a longitudinal segment of a non-magnetic tubular intermediate part of L-shaped cross section, and if an outwardly pointing flange segment of the intermediate part is tightly joined to an end toward the magnet coil of a nozzle holder. The magnet coil can thus be sealed off from the fuel simply, securely and reliably. This is true even if alcohol fuels are used, which are aggressive with respect to conventional sealing ring materials.
It is advantageous if the longitudinal segment of the intermediate part rests on the lower pole end, having a reduced outside diameter, and the flange segment of the intermediate part rests on a face-end recess of the end of the nozzle holder toward the magnet coil. As a result, the tubular intermediate part requires no additional space, and the fuel injection valve has a compact structure.
It is also advantageous if a guide face serving to guide the armature is formed in a through bore of the intermediate part extending concentrically with the longitudinal valve axis, so that together with the guidance of the ball, particularly good guidance of the valve element comprising at least the

REFERENCES:
patent: 4524743 (1985-06-01), McAuliffe et al.
patent: 4795098 (1989-01-01), Kirchner et al.
patent: 4798329 (1989-06-01), Mesinich
patent: 4981266 (1991-01-01), Aichele et al.
patent: 5002231 (1991-03-01), Reiter et al.

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