Multi-polarity type spark plug for use in an internal combustion

Details Multi-polarity type spark plug for use in an internal combustion Multi-polarity type spark plug for use in an internal combustion

1996-01-26

1997-10-21

O'Shea, Sandra L.

Electric lamp and discharge devices

Spark plugs

Particular electrode structure or spacing

H01T 1320

Patent

active

056800029

ABSTRACT:
In a multi-polarity type spark plug for an internal combustion engine, a tubular insulator is supported within a cylindrical metallic shell through which a spark plug is to be attached to an internal combustion engine. A center electrode is placed within the insulator, a front end of the center electrode being directed toward a combustion chamber of the internal combustion engine from a front end of the metallic shell so as to extend beyond a front end of the insulator. First and second ground electrodes are each connected to the front end of the metallic shell, the first ground electrode forming a first vertical spark gap with a front end surface of the center electrode which directly opposes an elevational side of the center electrode, and the second ground electrode forming a second horizontal spark gap with an elevational side of the center electrode. An angle .theta.a is limited as 60.degree..ltoreq..theta.a .ltoreq.150.degree. in which the angle .theta.a is taken when the first ground electrode forms against the second ground electrode with the center electrode as an axial center.

REFERENCES:
patent: 3870918 (1975-03-01), Senda et al.
patent: 4275328 (1981-06-01), Watanabe et al.

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