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AssigneeRobert Bosch GmbH
InventorsHeinz Ulm, Jochen Fischer
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Electrode and spark plug (5) for an internal combustion engine, having an electrode of this type as a center electrode. The electrode includes an electrode base element (20) made of a first material and an end section (30) that is integrally joined to the electrode base element (20), with this end section having a first area (23) that is integrally joined to the first material and is made of a platinum-containing material and having a second area (26) that is integrally joined to the first area (23) and is made of an iridium-containing and/or ruthenium-containing material. A method for manufacturing an electrode of this type, in which a first recess (21) is stamped in the electrode base element (20); a first preform (22) is inserted into the first recess (21); the first preform (22) is melted, thereby forming a first alloy; a second recess (24) is stamped in an area of the first alloy; a second preform (25) is inserted into the second recess (24); and the second preform (25) is melted, thereby forming a second alloy.
An electrode, in particular a center electrode in a spark plug, having an electrode base element (20) made of a first material and an end section (30) that is integrally joined to the electrode base element (20), wherein the end section (30) has a first area (23) that is integrally joined to the first material and is made of a platinum-containing material, and a second area (26) that is integrally joined to the first area (23) and is made of an iridium-containing and/or ruthenium-containing material that is different from the platinum-containing material.
The electrode according to at least one of the preceding claims, wherein the first material is nickel or a nickel alloy;
A spark plug for an internal combustion engine having an electrode according to at least one of the preceding claims as the center electrode (10).
A method for manufacturing an electrode, in particular a center electrode (10) for a spark plug (5), according to at least one of the preceding claims, including the following method steps:
The method according to at least one of the preceding claims, wherein method step g.) is followed, in particular, by a cutting process to produce a tip (31) of the electrode base element (20) that tapers, in particular, in the shape of a cone or frustum, with this tip having an end face (32) that is integrally joined to a first area (23) made of the first alloy, which, in turn, is integrally joined to a second area (26) made of the second alloy.
Dependencies are inferred from the claim text.