Robert Boschgmbh

Alfred Hoch

Matthias Herrmann

Wilhelm Christ

Dieter Liedtke

Bernhard Zeiss

Ralf Kuebler

Lars Ulrich

Franz Wolf

The invention relates to a method for producing an injection valve for liquids, preferably an injection valve for injecting fuel into a combustion chamber of an internal combustion engine. The injection valve has a valve body, with a valve seat which is formed therein, and a valve needle which interacts with the valve seat in order to open and close at least one injection opening. The injection valve is produced by means of the following method steps: producing the valve body from steel, hardening the valve body, annealing a partial region of the valve body at an annealing temperature. The device for carrying out the method according to the invention has an inductive annealing generator which generates a suitable alternating current for operating a coil, in the magnetic field of which coil the valve body can be heated for annealing.

Injection valve, method for its production, and apparatus for performing the method

A fuel injection valve for internal combustion engines, having a valve body and at least one injection opening embodied in it, through which opening, controlled by a valve needle that cooperates with a valve seat embodied in the valve body, fuel can be injected into the combustion chamber of the engine. The valve body comprises a high-alloy hot-work steel, which has been hardened by a case-hardening process.

Fuel injection valve for internal combustion engines and a method for hardening the said valve

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Ebelsbach, Germany

Alfred Hoch