Method for producing electrodes for spark plugs and spark plug electrodes

US5310373A · kind A · utility

Assignee

• Robert Bosch GmbH · DE

Inventors

• Jurgen Treiber · Bamberg, DE
• Rainer Noack · Bietigheim, DE
• Klaus Pohl · Sankt Wendel, DE
• Willi Frank · Bamberg, DE
• Volker Brendick · Gerlingen, DE
• Hans Hurbert · Hallstadt, DE

Key dates

• Filing date: May 8, 1992
• Grant date: May 10, 1994
• Expiry date: May 8, 2012

Classification

• Technology area (CPC H): Electricity
• CPC primary: H01T21/02
• WIPO field: Machine tools
• WIPO sector: Mechanical engineering

Abstract

The invention relates to a method for producing a longlife, resistant spark plug for internal combustion engines. The electrode (16), according to the invention, of the spark plug is assembled from a plurality of initial parts: an initial part for a corrosion-resistant shell (31'), an initial part for a core (33') of high thermal conductivity, and an initial part for an erosion-resistant region (32'). These initial parts are jointly impact-extruded to form an electrode blank which is formed into the center electrode (16) by machining its head (51) and its region on the combustion-chamber side. Electrodes which are especially highly stressed are given a fourth initial part, which is also to be impact-extruded, consists of highly erosion-resistant material and is still arranged on the combustion-chamber side in front of the erosion-resistant region (32'). The electrode (16) can be used as a center electrode (16), but can also be used, if necessary, as an earth electrode after an embossing and bending process.