Patent · US Expired

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

US6762539B2 · kind B2 · utility

1Cited by

7References

12Claims

0Family size

Assignee

Robert Bosch GmbH · DE

Inventors

Dittmar Klett · Freiberg am Neckar, DE
Heinz Ulm · Gräfenberg, DE
Simon Schmittinger · Renningen, DE
Dietrich Trachte · Leonberg, DE
Jochen Fischer · Whitehall, US

Key dates

Filing date	May 7, 2002
Grant date	Jul 13, 2004
Priority date	—
Expiry date	May 7, 2022

Classification

Technology area (CPC H)Electricity
CPC primaryH01T21/02
WIPO fieldElectrical machinery, apparatus, energy
WIPO sectorElectrical engineering

Abstract

A spark plug for an internal combustion engine includes a middle electrode which has an electrode base body (5) with an end face (51) oriented toward the combustion chamber, to which end face a precious metal platelet (8) is attached. An end section (15) of the electrode base body oriented toward the combustion chamber is formed in the shape of a truncated cone. The precious metal platelet (8) is likewise formed in the shape of a truncated cone and the diameter of the end face (52) of the electrode base body oriented toward the combustion chamber corresponds to the diameter of the end face (84) 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.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.