Injection valve
AssigneeRobert Bosch GmbH
InventorsJoerg Heyse, Norbert Belzner
Life of this patent
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Abstract
In an injection valve, a perforated disk made from a material of relatively great hardness. The perforated disk has a tensile strength of >800N/mm.sup.2. Spray holes are punched from a downstream side of the perforated disk to an upstream side. A stamping break-out, which occurs due to the greater brittleness of the material, has no negative effects since the perforated disk is installed in the injection valve such that the direction of flow of the medium is exactly opposite to the punching direction. The injection valve is particularly suitable for fuel injection systems of mixture-compressing applied ignition internal combustion engines.
Claims6
In an injection valve having an upstream direction and a downstream direction, a perforated disk comprising:
- (a) a first surface;
- (b) a second surface arranged upstream of the first surface;
- and
- (c) at least one spray hole, the at least one spray hole being produced by punching from the first surface to the second surface,
- wherein the perforated disk has a tensile strength of at least 800N/mm.sup.2.
A method for producing a perforated disk for use in an injection valve, the method comprising steps of:
- (a) providing a disk having a tensile strength of at least 800N/mm.sup.2, and having an upstream surface and a downstream surface;
- and
- (b) punching, from the downstream surface to the upstream surface, at least one spray hole into the disk.
Dependencies are inferred from the claim text.