Fuel injection valve

#The invention relates to a valve, in particular a fuel injection valve for a high-pressure accumulator injection system of an internal combustion engine.

#With conventional fuel injectors for injection systems of internal combustion engines the fuel injection nozzle is typically controlled by means of a valve needle, which is arranged to form a moving seal within a guide in a valve body of an injection valve. The valve needle features a valve needle seat at its tip, which, together with a valve body seat of the valve body, opens or closes at least one spray orifice to the combustion chamber of the internal combustion engine. The at least one spray orifice is typically located in the area of the valve body seat.

#With the pressures which arise, the sealing edges and passages in the fuel injector are subject to significant mechanical stress, which also varies greatly during operation. The sealing of the injection valve is therefore especially important, even with common-rail systems, since by contrast with conventional systems for periodic injection, these are permanently under system pressure in each case so that bad seals can lead to continuous injection.

#The invention is now explained in greater detail using exemplary embodiments which refer to the enclosed Figures. The diagrams show:

#FIG. 1 a schematic cross sectional view of the fuel injection valve in accordance with the invention; and

#FIG. 2 a view from above of the fuel injection valve in accordance with FIG. 1.

#FIG. 1 shows a fuel injection valve in accordance with the invention in a schematic cross sectional view. The fuel injection valve 2 consists of a valve body 4 and a valve needle 6 which is guided sealed with a valve needle guide 8 within the valve body 4.

#One or more spray orifices 16 are provided in a pocket hole 12 of the valve body 4. The valve needle 6 features a tip 7 with a seating edge 14 and a valve needle seat 18. This valve needle seat 18 sits on a valve body seat 20 thus seals the injection valve 2 with the spray orifices 16.

#Via the fuel inlet 26 and a circular pressure chamber 22 lying between the valve needle 6 and the valve body 4 the fuel reaches the seat edge 14 and with valve needle 6 lifted, passes along the circular chamber 28 between valve needle 6 and valve body on via the pocket hole 12 and the spray orifice 16 into the combustion chamber of the internal combustion engine.