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US 2015/0083829 A1Published application
Wear-Optimised Production of Conical Injection Holes
AssigneeRobert Bosch GmbH
InventorHeinrich Werger
Life of this patent
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Abstract
A method for producing injection holes in fuel injection nozzles for internal combustion engines. An injection hole is formed by at least one abrading manufacturing method. An injection nozzle is subsequently subjected to a hardening treatment at least in the region of the injection hole, such that the injection hole surface is hardened over the entire axial length thereof.
Claims14
A method for producing spray holes in fuel injection nozzles for internal combustion engines, comprising:
- forming a spray hole in a fuel injection nozzle using at least one material-removing manufacturing process;
- and
- hardening at least a region of the fuel injection nozzle comprising the spray hole with a hardening treatment such that the an entirety of an axial length of a surface of the spray hole is hardened.
A fuel injection nozzle for internal combustion engines, comprising:
- at least one spray hole, is defined by a non-cylindrical form, wherein an entirety of an axial length of a region of the at least one spray hole and an entirety of an axial length of a surface of the at least one spray hole are hardened.
Dependencies are inferred from the claim text.