Fluid sprinkling – spraying – and diffusing – Including valve means in flow line – Reciprocating
Patent
1991-12-13
1993-06-29
Kashnikow, Andres
Fluid sprinkling, spraying, and diffusing
Including valve means in flow line
Reciprocating
239900, F02M 5106, F02M 6104, F16K 3106
Patent
active
052226735
DESCRIPTION:
BRIEF SUMMARY
STATE OF THE ART
The invention is based on an electromagnetically actuated fuel injection valve. An electromagnetically actuated fuel injection valve, in which a stop pin is located in a blind hole of the inner pole extending concentrically with the valve longitudinal axis, is already known from U.S. Pat. No. 4,646,974. The opening displacement of the valve needle, which interacts with a fixed valve seat and has the armature at one end and the valve closing body at the other, is limited because the end surface of the valve needle remote from the valve closing body is in contact with the stop pin. The valve needle has a great length and the fuel injection valve therefore has a large installation volume. The large mass of the valve needle leads, furthermore, to poor dynamic behaviour of the fuel injection valve. In the event of a possible oblique attitude of the valve needle, the danger of opening strokes which differ from one another and of jamming of the valve needle cannot be excluded because of the great length.
ADVANTAGES OF THE INVENTION
The electromagnetically actuated fuel injection valve of the invention has, in contrast, the advantage of a particularly compact installation shape because the stop pin protrudes into the passage hole of the armature and acts directly on the valve closing body. The resulting light and compact design of the moving valve part leads to good dynamic behaviour and good long-term running behaviour of the fuel injection valve.
The danger that an oblique attitude of the moving valve part comprising the valve closing body and the armature can lead to different opening strokes of the valve closing body is prevented by the stop pin being directly in contact with the valve closing body in the open position of the latter.
Advantageous extensions and improvements to the prior art valve are possible by means of the measures listed hereinafter.
It is advantageous for a connecting ring to be located on the side of the magnet coil facing towards the armature, this connecting ring having a leak-tight connection, at its inner opening, with the inner pole. This has the effect that no fuel can reach the magnet coil between the inner pole and the connecting ring.
It is particularly advantageous for the connecting ring to have a leak-tight connection, at its periphery, with a valve casing of the fuel injection valve so that the magnet coil is completely sealed against the fuel and does not come into contact with it.
It is also, however, advantageous for the connecting ring to have an L-shaped cross-section, in order to form an annular chamber on the side of the magnet coil facing towards the armature, so that the radially extending side surfaces are formed by a coil carrier part of the magnet coil and by an annular shoulder of the connecting ring and the axially extending side surfaces are formed by the periphery of the connecting ring and by a longitudinal opening in the valve casing. A sealing ring is located in the annular chamber. In this way, safe and reliable sealing is provided between the connecting ring and the valve casing and, therefore, the magnet coil is sealed against the fuel.
It is advantageous for the connecting ring to be formed from a non-magnetic material with a high specific electrical resistance so that the influence of the connecting ring on the magnetic field is very small and the occurrence of additional eddy current losses is prevented.
It is particularly advantageous for the connecting ring to be formed from a ceramic material which is nonmagnetic and has, in addition, a high specific electrical resistance.
It is advantageous for the armature to be directly connected to the ball-type valve closing body so that the moving valve part is particularly light and compact and can, furthermore, be manufactured in a simple manner. A low mass of the moving valve part permits good dynamic behaviour and good long-term running behaviour of the fuel injection valve.
It is particularly advantageous for a flange to be formed on the end of the inner pole facing towards the valve
REFERENCES:
patent: 3001757 (1961-09-01), Ball
patent: 3731880 (1973-05-01), Williams
patent: 4130095 (1978-12-01), Bowler et al.
patent: 4306683 (1981-12-01), Mallinson
patent: 4621772 (1986-11-01), Blythe et al.
patent: 4655396 (1987-04-01), Taxon et al.
patent: 4733822 (1988-03-01), Romann
patent: 4887769 (1989-12-01), Okamoto et al.
patent: 5054691 (1991-10-01), Huang et al.
Grant William
Greigg Edwin E.
Greigg Ronald E.
Kashnikow Andres
Robert & Bosch GmbH
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