Fluid sprinkling – spraying – and diffusing – Including valve means in flow line – Reciprocating
Patent
1993-03-17
1994-08-09
Kashnikow, Andres
Fluid sprinkling, spraying, and diffusing
Including valve means in flow line
Reciprocating
239600, F02M 5106
Patent
active
053358643
DESCRIPTION:
BRIEF SUMMARY
State of the Art
The invention is directed to a fuel-injection valve as set forth hereinafter. A fuel-injection valve, in which a perforated disc is fastened to the valve-seat body by means of a continuous welding seam, has already been proposed. In this, the perforated disc has to be made relatively thick, in order to prevent the perforated disc from lifting off as a result of the prevailing fuel pressure, thereby changing the jet pattern of the sprayed fuel in an undesirable way. The relatively large thickness of the perforated disc entails a disadvantage that the fuel issuing from the spray orifices of the perforated disc is not broken up into very fine fuel droplets in the desired way, that is to say optimum fuel treatment is not achieved.
Advantages of the Invention
In contrast to this, the advantage of the fuel-injection valve according to the invention is that a perforated disc thinner than the known perforated discs can be used and leads to an optimum fuel treatment with very fine fuel droplets, without the spray pattern of the sprayed fuel jet being impaired.
Advantageous developments and improvements of the fuel-injection valve indicated hereinafter are possible as a result of the measures listed herein.
It is especially advantageous to make the supporting disc pot-shaped and to connect its continuous holding edge sealingly to the seat carrier after the valve-seat body has been set in its axial position, so that the setting of the valve stroke and consequently of the injected fuel quantity is thereby possible. It is also advantageous for this setting if the holding edge of the supporting disc is bent outwards towards its free end and bears with this free end under radial tension against the wall of a longitudinal orifice of the seat carrier, so that, during the setting operation, the valve-seat body is always held in its axial position, until the desired setting is obtained and, for the final fixing of the holding edge of the supporting disc, is welded to the wall of the longitudinal orifice of the seat carrier.
It is also advantageous if the passage orifice of the supporting disc surrounds as near as possible the region of the perforated disc which is provided with at least one spray orifice and which is arched downstream and made dome-shaped, in order to prevent an undesirable bending of the perforated disc as a result of the prevailing fuel pressure.
DRAWING
An exemplary embodiment of the invention is illustrated in simplified form in the drawing and explained in more detail in the following description.
DESCRIPTION OF THE EXEMPLARY EMBODIMENT
The figure partially shows by way of example a fuel-injection valve for fuel-injection systems of mixture-compressing spark-ignition internal-combustion engines. The fuel-injection valve has a tubular seat carrier 1, in which a longitudinal orifice 3 is formed concentrically relative to a longitudinal valve axis 2. Arranged in the longitudinal orifice 3 is a tubular valve needle 5 which is connected at its downstream end 6 to a spherical valve-closing body 7. The actuation of the fuel-injection valve takes place, for example, electromagnetically in a known way. For the axial movement of the valve needle 5 and therefore for opening and closing the fuel-injection valve, there is an indicated electromagnetic circuit having a magnet coil 10, an armature 11 and a core 12. The armature 11 is connected to the end of the valve needle 5 facing away from the valve-closing body 7 and is aligned with the core 12.
A guide orifice 16 of a valve-seat body 18 serves for guiding the valve-closing body 7 during the axial movement. The circumference of the valve-seat body 18 has a slightly smaller diameter than the diameter of the longitudinal orifice 3 of the seat carrier 1. On one of its end faces, the end face 19 facing away from the valve needle 5, a metallic perforated disc 22 is arranged concentrically on the valve-seat body 18 and is firmly connected to the latter. The perforated disc 22 has, for example, a thickness of 0.1 mm. A supporting disc 26 made th
REFERENCES:
patent: 1589247 (1926-06-01), Scott
patent: 4030668 (1977-06-01), Kiwior
patent: 4934653 (1990-06-01), Gried et al.
patent: 4971254 (1990-11-01), Daly et al.
patent: 5002231 (1991-03-01), Reiter et al.
Maier Martin
Reiter Ferdinand
Romann Peter
Greigg Edwin E.
Greigg Ronald E.
Kashnikow Andres
Robert & Bosch GmbH
Weldon Kevin
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