Spark plug for internal combustion engine

Details Spark plug for internal combustion engine Spark plug for internal combustion engine

1991-04-19

1992-09-01

DeMeo, Palmer C.

Electric lamp and discharge devices

With temperature modifier

Spark plug type

313142, 313143, H01T 1316, H01T 1332

Patent

active

051441888

ABSTRACT:
In a spark plug having a cylindrical metallic shell a front end of which is extended into a combustion chamber of an internal combustion engine, an insulator is provided within the metallic shell so as to provide an annular clearance between a front end of the metallic shell and that of the insulator, a width of the annular clearance being within a range of 0.65 mm .+-.0.25 mm. An extension skirt which the metallic shell is extended into the combustion chamber has a length within a range from 1.0 mm to 3.0 mm. A tapered surface is provided by planing off an inner edge of a front end of the metallic shell, and the surface angularly falls within angles from 20 to 40 degrees. One end of an outer electrode is welded to the tapered surface while other end of the outer electrode is bent to oppose a front end of a center electrode.

REFERENCES:
patent: 1295126 (1919-02-01), Daffron
patent: 2371211 (1945-03-01), Barrington
patent: 4211952 (1980-07-01), Iwata et al.
patent: 4289990 (1981-09-01), Mayumi et al.

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