Fluid sprinkling – spraying – and diffusing – Including valve means in flow line – Reciprocating
Patent
1998-11-02
2000-06-27
Kashnikow, Andres
Fluid sprinkling, spraying, and diffusing
Including valve means in flow line
Reciprocating
2395853, 2395854, 239900, B05B 130, F02M 5100
Patent
active
060796421
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND INFORMATION
An electromagnetically actuatable fuel injection valve, which has an axially movable valve needle as the closure element support for a spherical valve closure element, is described in German Patent Application No. 33 18 486. With a lower end region, the closure element support fits only partially around the valve closure elements, such that the enclosed region of the valve closure element extends at most only to its greatest diameter. The opening width of the recess receiving the valve closure element in the end region of the closure element support perpendicular to the longitudinal valve axis is thus at least as great as the greatest diameter of the valve closure element. A direct joining method, for example welding, soldering, or adhesive bonding, must be used to prevent the valve closure element from slipping out of the recess. If the recess and the valve closure element have the dimensions of a press fit, the valve closure element can also be retained by being pressed into the closure element support.
German Patent Application No. 195 03 224 describes an electromagnetically actuatable injection valve which has a valve needle whose closure element support, serving as the connecting part, is shaped from plastic. The spherical valve closure element and the closure element support are immovably joined to one another via a snap connection, the closure element support possessing resilient retaining jaws which fit around the valve closure element.
It has been known for some time, as is also evident from German Patent Application No. 40 08 675, to achieve immovable joins between individual components of valve needles in direct fashion, for example using weld beads.
Also known, from German Patent Application No. 38 08 635, is a fuel injection apparatus which has a valve needle having external helical grooves. The grooves delimited in the valve element form helical fuel channels which not only impart a swirl to the fuel, but also control the fuel flow velocity.
SUMMARY OF THE INVENTION
According to the present invention, a fuel injection valve can be manufactures particularly easily in an economical and reliably processed fashion. It is of particular advantage in this context that an extremely simple and economical and nevertheless very secure join between a closure element support and a spherical valve closure element can be attained. In this context, in order to fit securely around the valve closure element, the closure element support is shaped in an end region with a recess in such a way that the valve closure element penetrates into the recess, viewed in the axial direction, beyond its equator, i.e. the region of greatest radial extension. Attachment of the valve closure element is accomplished in that the end region constituting an annular retaining jaw is at least partially plastically deformed radially inward, using a crimping tool, in such a way that the opening width of the recess at its downstream end is less than the diameter of the valve closure element. A very reliable and durable connection to the valve needle is achieved without the use of a joining method to achieve a direct join.
The closure element support can be embodied as a cold-pressed part. Through openings can thereby be formed concurrently in simple fashion.
It is advantageous to configure grooves as fuel flow passages in helical form on the periphery of the valve needle. They allow a swirl to be applied to the fuel to improve its atomization.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 shows a fuel injection valve according to the present invention.
FIG. 2 shows an enlarged view of a valve needle manufactured according to the present invention.
DETAILED DESCRIPTION
The electromagnetically actuatable valve according to the present invention shown in exemplary and partially simplified fashion in FIG. 1, in the form of an injection valve for fuel injection systems of mixture-compressing, spark-ignited internal combustion engines, has a one-piece largely tubular metal base element 2 which is surrounded by a ma
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Ganey Steven J.
Kashnikow Andres
Robert & Bosch GmbH
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