Method of production of a spark plug for internal combustion engines

US4963112A · kind A · utility

Assignee

• Robert Bosch GmbH · DE

Inventors

• Walter Benedikt
• Karl-Hermann Friese · Leonberg, DE
• Werner Herden · Gerlingen, DE
• Dietrich Schuldt · Stuttgart, DE
• Leo Steinke · Waiblingen, DE

Key dates

• Filing date: Apr 6, 1989
• Grant date: Oct 16, 1990
• Expiry date: Apr 6, 2009

Classification

• Technology area (CPC H): Electricity
• CPC primary: H01T21/02
• WIPO field: Electrical machinery, apparatus, energy
• WIPO sector: Electrical engineering

Abstract

A method of producing a spark plug for internal combustion engines comprising arranging a metal piece formed of a noble material on an end face of at least one metal electrode of the spark plug and directing laser beams onto an outer surface of the metal piece facing the spark gap to form an alloy zone between the one metal electrode and a wear-resistant layer facing the spark gap, the alloy zone consisting of materials of the metal electrode and the metal piece with the proportion of the material of the metal electrode continuously decreasing from an area abutting the metal electrode and consisting only of the metal electrode material, to an area abutting the wear-resistant layer which consists only of the material of the metal piece.