Fluid sprinkling – spraying – and diffusing – Fluid pressure responsive discharge modifier* or flow... – Fuel injector or burner
Reexamination Certificate
1999-02-24
2001-02-13
Kashnikow, Andres (Department: 3752)
Fluid sprinkling, spraying, and diffusing
Fluid pressure responsive discharge modifier* or flow...
Fuel injector or burner
C239S533120, C239S504000, C251S129210
Reexamination Certificate
active
06186419
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to a fuel injection valve and to a fuel injector nozzle, in particular for direct injection of fuel into the combustion chamber of an internal combustion engine.
BACKGROUND INFORMATION
A conventional fuel injector nozzle is described in, e.g., German Patent No. 43 03 813. This conventional fuel injector nozzle includes a nozzle body having a blind bore in which a valve needle, which has at its downstream end a valve closure element, is axially movable. The valve closure element is of conical configuration and has a valve closure surface which coacts with a valve seat surface provided internally on the nozzle body to form a valve seat. The valve needle is preloaded in the closing direction by a return spring. At its spray-discharge end, the nozzle body has several radial bores, arranged in circumferentially distributed fashion, which penetrate through the nozzle body and, when the fuel injector nozzle is in the open position, are connected to the blind bore of the nozzle body. With the fuel injection valve in the closed position, however, inflow of fuel from the blind bore to the radial bores is interrupted.
A fuel injector nozzle of similar design, but with several pairs of radial bores which open into a common outlet opening at different spray angles, is described in German Patent Application No. 41 42 430.
In these conventional fuel injector nozzles, it is disadvantageous that axial and radial fuel distribution cannot be adapted to the geometrical conditions of the internal combustion engine on which the fuel injector nozzles are mounted. Since, however, the positions of the spark plug, the intake and exhaust valves, and other components in and on the combustion chambers of the internal combustion engine can vary considerably from one internal combustion engine to another or from one vehicle model to another, flexibility in the use of the known fuel injector nozzles is limited. The provision in each case of a pair of radial bores with different spray angles, as described in German Patent Application No. 41 42 430, moreover requires a relatively high production outlay.
SUMMARY OF THE INVENTION
The fuel injection valve or fuel injector nozzle according to the present invention, has the advantage that the sprayed fuel is distributed in directed fashion, and that distribution of the fuel can easily be varied by varying the geometrical configuration of the sleeve body. For example, the angle of inclination of the impact surface at which the fuel strikes the sleeve body, as well as the surface structuring of the impact surface (for example with radial flutes), have a substantial influence on fuel distribution. The impact surface can be inclined with respect to the vertical plane of the longitudinal axis of the fuel injection valve or the fuel injector nozzle in both the radial and the tangential direction. Together with surface structuring, several degrees of freedom therefore result for fuel stream forming. One variation in fuel distribution can be economically achieved in that a differently shaped sleeve body is used for each application. While the usual components of the fuel injection valve or fuel injector nozzle can be uniformly produced for all applications with no individual modifications, only a differently shaped sleeve body is used in each case. Production costs can thereby be considerably reduced.
It is advantageous if the impact surface of the sleeve body has on its radially external end an at least partially circumferential detachment edge which is undercut, by an at least partially circumferential groove in the sleeve body, in such a way that the contour of the sleeve body forms an acute angle at the detachment edge. A good turbulence in the fuel-air mixture is thereby obtained. A recirculation zone is created in the region of the groove. It is possible to arrange ignition electrodes in this region, since in this region the concentration of the fuel-air mixture lies within ignition limits. If the ignition electrodes are arranged so that they extend axially only as far as the circumferential groove of the sleeve body, this ensures that the ignition electrodes are not directly wetted by the fuel stream, which would be disadvantageous. The ignition electrodes lie, to a certain extent, in the shadow of the detachment edge. With this combination of the fuel injection valve or fuel injector nozzle with a spark plug, it is advantageous to configure the sleeve body from a preferably ceramic insulating material.
The sleeve body can also be subdivided into several sectors spaced apart by recesses, at least one impact surface for a fuel stream being provided in each sector. The nozzle body preferably has several circumferentially distributed radial bores, through each of which a separate fuel stream emerges and strikes an associated sector of the sleeve body. The impact surfaces can also be inclined in a tangential direction with respect to the vertical plane of the longitudinal axis.
The impact surface of the sleeve body or the impact surface of each sector of the sleeve body can have a surface structuring, preferably in the form of flutes running in a radial direction.
The fuel injection valve or fuel injection nozzle can have either an inward-opening or an outward-opening valve closure element. When an outward-opening valve closure element is used, it is advantageous if the sleeve body projects beyond the spray-discharge end of the nozzle body that forms the valve seat surface by an axial longitudinal distance which is smaller than the maximum opening stroke of the valve closure element. The result is that when the opening stroke of the valve closure element is short, the fuel stream strikes the impact surface of the sleeve body and is deflected in the axial direction. If the opening stroke of the valve closure element is relatively long, on the other hand, a portion of the fuel stream does not strike the impact surface of the sleeve body, but rather is sprayed out in a radial direction. This variation in the effective spray discharge direction as a function of the opening stroke is very advantageous for certain applications for fuel injection valves or fuel injector nozzles which inject directly into the combustion chamber of the internal combustion engine.
REFERENCES:
patent: 4177948 (1979-12-01), Schaffitz et al.
patent: 5343699 (1994-09-01), McAlister
patent: 5348232 (1994-09-01), Babitzka et al.
patent: 41 42 430 (1992-07-01), None
patent: 43 03 813 (1994-06-01), None
patent: 195 23 165 (1996-01-01), None
patent: 0 363 162 (1990-04-01), None
patent: 2 240 137 (1991-07-01), None
Dittus Bernd
Kampmann Stefan
Douglas Lisa Ann
Kashnikow Andres
Kenyon & Kenyon
Robert & Bosch GmbH
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