Multi-gap spark plug for an internal combustion engine

Details Multi-gap spark plug for an internal combustion engine Multi-gap spark plug for an internal combustion engine

1991-02-27

1993-02-23

DeMeo, Palmer C.

Electric lamp and discharge devices

Spark plugs

Plural parallel gaps

313143, H01T 1346, H01T 1332

Patent

active

051893339

ABSTRACT:
In a multi-gap type spark plug for an internal combustion engine, the spark plug has a cylindrical metallic shell into which a tubular ceramic insulator is enclosed. The insulator has a tapered front leg portion, a front end of which extends beyond that of the metallic shell. A center electrode is enclosed into the insulator, having at a front end thereof, a filing tip extending beyond that of the insulator. A plurality of L-shaped outer electrodes each having a vertical piece and lateral piece, the vertical piece depending from the front end of the metallic shell to surround the front end of the insulator, while the lateral piece having an inner surface arranged in parallel with a front end surface of the insulator, and having an end tip terminated to oppose an outer surface of the firing tip through a spark gap established therebetween. A vertical distance between the front end surface of the insulator and the inner surface of the lateral piece of each outer electrode is determined to be within a dimension ranging from 0.3 mm to 1.2 mm.

REFERENCES:
patent: 1270521 (1918-06-01), Hill
patent: 2252636 (1941-08-01), Kohout et al.
patent: 4211952 (1980-07-01), Iwata et al.
patent: 4931686 (1990-06-01), Oakley

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