Robert Boschgmbh

Heinz Ulm

Jochen Fischer

Dietrich Trachte

Andreas Benz

Detlef Hartmann

Dittmar Klett

Thomas Juestel

Simon Schmittinger

Konrad Funk

Stephan Weigel

Rainer Kocik

Martin Klassen

Peter Metzler

Gerda Schramm

Erhard Alt

A method of joining an electrode of a spark plug with a noble metal is described, the noble metal being joined locally with the electrode using a thermal input produced by a continuously operating laser beam.

Method for producing a spark plug electrode

An electrode and spark plug for an internal combustion engine including an electrode of this type as a center electrode. The electrode includes an electrode base element made of a first material and an end section that is integrally joined to the electrode base element, with this end section including a first area that is integrally joined to the first material and is made of a platinum-containing material and including a second area that is integrally joined to the first area and is made of an iridium-containing and/or ruthenium-containing material. In a method for manufacturing an electrode of this type, a first recess is stamped in the electrode base element, a first preform is inserted into the first recess, the first preform is melted, thereby forming a first alloy, a second recess is stamped in an area of the first alloy, a second preform is inserted into the second recess, and the second preform is melted, thereby forming a second alloy.

Electrodes, method for production thereof and spark plugs with such an electrode

A spark plug for an internal combustion engine includes a middle electrode which has an electrode base body ( ) with an end face ( ) oriented toward the combustion chamber, to which end face a precious metal platelet ( ) is attached. An end section ( ) of the electrode base body oriented toward the combustion chamber is formed in the shape of a truncated cone. The precious metal platelet ( ) is likewise formed in the shape of a truncated cone and the diameter of the end face ( ) of the electrode base body oriented toward the combustion chamber corresponds to the diameter of the end face ( ) of the precious metal platelet oriented away from the combustion chamber. A method for producing middle electrodes for a spark plug of an internal combustion engine is also proposed.

Spark plug for an internal combustion engine and method for production of a middle electrode for an internal combustion engine spark plug

A spark plug electrode having a welded-on noble-metal part for a longer service life of the spark plug. Prior to the welding process, the noble-metal part is provided with a profiling on the side facing the spark plug electrode.

Spark plug electrode including a profiled noble-metal part

Growing community of inventors

Kunreuth, Germany

Heinz Ulm