Spark plug for internal combustion engines

US5612586A · kind A · utility

Assignee

• Robert Bosch GmbH · DE

Inventors

• Walter Benedikt
• Dittmar Klett · Freiberg am Neckar, DE
• Dietrich Trachte · Leonberg, DE
• Hermann Kersting · Oelde, DE
• Roland Mueller · Caledon East, CA
• Jochen Fischer · Whitehall, US

Key dates

• Filing date: Jun 6, 1995
• Grant date: Mar 18, 1997
• Expiry date: Jun 6, 2015

Classification

• Technology area (CPC H): Electricity
• CPC primary: H01T13/32
• WIPO field: Electrical machinery, apparatus, energy
• WIPO sector: Electrical engineering

Abstract

A spark plug for internal combustion engines ensures the formation of two spark paths. These two spark paths are a pure air spark which jumps over from electrode to electrode, and a creepage spark which emerges from the central electrode, creeps along the insulator and then jumps over at the point at the smallest distance between the insulator and the earth electrode. The spark plug includes a cylindrical metal tube which forms a housing and in which the central electrode is arranged, surrounded centrally by an insulator. The earth electrodes mounted on the metal tube are partially bent so that an obtuse bending angle of the bent-over part with respect to the part of the earth electrode which extends in the direction of the rotationally symmetrical longitudinal axis is produced.