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
2395851, F02M 5106, F02M 6112
Patent
active
052226743
DESCRIPTION:
BRIEF SUMMARY
PRIOR ART
The invention is directed to an electromagnetically actuable fuel injection valve. German Patent 2,905,099 has already disclosed an electromagnetically actuable fuel injection valve in which a stop plate is arranged between a stop shoulder of the valve needle and an inner shoulder of the valve casing, the said stop plate limiting the stroke of the valve needle. Between its through opening and its circumference, the stop plate has an assembly slot, the clear width of which is larger than the diameter of the valve needle in the corresponding region. During assembly of the fuel injection valve, large axial forces act on the valve casing, the stop plate and the nozzle body due to the flanging of that end of the valve casing which faces the valve seat around the nozzle body guiding the valve needle. Due to the impressing of the stop plate, this leads to plastic deformations of the metallically soft valve casing, which is designed to be of a ferromagnetic material. The high edge pressure at the assembly slot can give rise to non-uniform and particularly pronounced deformations of the inner shoulder of the valve casing. Dimensional and position changes of the stop plate, the valve casing and the valve needle resulting from this have an effect, for example in the form of altered ejection quantities, on the operating behavior of the fuel injection valve.
ADVANTAGES OF THE INVENTION
In contrast, the fuel injection valve according to the invention, has the advantage of improved assembly, a more exact installation position of the stop plate and of the nozzle body and hence a higher stability under conditions of continuous running. The recesses additionally formed in the stop plate lead to a uniform and reduced impressing of the stop plate in the region of the assembly slot into the inner shoulder of the valve casing and hence to particularly low dimensional and position changes of the stop plate, the valve casing, the nozzle body and the valve needle.
Advantageous further developments and improvements of the fuel injection valve given are possible by means of the measures presented herein.
It is particularly advantageous if the width of the recesses corresponds approximately to the width of the assembly slot, guaranteeing particularly uniform and slight impressing of the stop plate in the region of the assembly slot into the inner shoulder of the valve casing.
It is advantageous if the recesses are designed as grooves and the grooves extend radially from the through opening towards the circumference of the stop plate. This makes possible a completely symmetrical design of an upper stop-plate stop face resting against the inner shoulder of the valve casing and hence particularly uniform and slight impressing of the stop plate in the region of the assembly slot into the inner shoulder of the valve casing.
However, it is also advantageous if the recesses are designed as pockets which are open towards the circumference of the stop plate and can pass through the stop plate, with the result that the recesses can be produced in a simple manner and nevertheless guarantee a reduced and uniform deformation of the inner shoulder of the valve casing by the stop plate in the region of the assembly slot.
It is advantageous here if the pockets are of circular design, allowing them to be produced in a particularly simple manner by means of a milling cutter or drill.
DRAWING
Illustrative embodiments of the invention are depicted in simplified form in the drawing and explained in greater detail in the description. In the drawing,
FIG. 1 shows a fuel injection valve,
FIG. 2 shows a first illustrative embodiment of a stop plate designed in accordance with the invention,
FIG. 3 shows a section along the line III--III in FIG. 2,
FIG. 4 shows a second illustrative embodiment of a stop plate designed in accordance with the invention and
FIG. 5 shows a section along the line V--V in FIG. 4.
DESCRIPTION OF THE ILLUSTRATIVE EMBODIMENTS
The electromagnetically actuable fuel injection valve for fuel injection systems of intern
REFERENCES:
patent: 4637554 (1987-01-01), Takeda
Hans Waldemar
Preussner Christian
Grant William
Greigg Edwin E.
Greigg Ronald E.
Kashnikow Andres
Robert & Bosch GmbH
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