Patent · US Expired

Spark plug with combined surface and air spark paths

US4795937A · kind A · utility

31Cited by

6References

22Claims

0Family size

Assignee

Beru Ruprecht GmbH & Co. KG · DE

Inventors

Eberhard P. Wagner · Stuttgart, DE
Rudolf Maly · Sindelfingen, DE
Otto Loffler · Stuttgart, DE
Werner Niessner · Steinheim, DE

Key dates

Filing date	Dec 9, 1986
Grant date	Jan 3, 1989
Priority date	—
Expiry date	Dec 9, 2006

Classification

Technology area (CPC H)Electricity
CPC primaryH01T13/52
WIPO fieldElectrical machinery, apparatus, energy
WIPO sectorElectrical engineering

Abstract

In a spark plug with combined surface and air spark paths comprising a center electrode, and insulator which surrounds the center electrode and which, at least in the end region of the center electrode, maintains a gap with respect thereto, and a ground electrode which, together with the spark plug body, surrounds the insulator and which at least in the end region of the insulator maintains a gap with respect thereto, the insulator, to form a discharge chamber surrounding the end portion of the center electrode, extends in the axial direction of the plug beyond the center electrode, and the ground electrode encompasses the insulator around the end thereof with an extension of the ground electrode extending into the discharge chamber with a clearance gap being maintained between the extension and the end portion of the insulator.

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