Spark plug in use for an internal combustion engine

Details Spark plug in use for an internal combustion engine Spark plug in use for an internal combustion engine

1997-01-17

1999-02-02

Font, Frank G.

Electric lamp and discharge devices

Spark plugs

Particular electrode structure or spacing

313142, 313143, H01T 1320

Patent

active

058669728

ABSTRACT:
In a spark plug for use for an internal combustion engine, an elongated insulator is provided in which a center electrode is supported. A cylindrical metal shell is provided in which the insulator is supported, and a ground electrode extends from the metal shell to form a spark gap with a front end of the center electrode. The front end of the center electrode has a tapered-off step section whose front end surface has a spark erosion resistant portion, and having a boundary between a columnar portion of the center electrode and the tapered-off step section. The boundary of the tapered-off step section is located within a front end surface of the insulator, and a front end surface of the tapered-off step section is positioned outside of the front end surface of the insulator. The front end of the center electrode forms a conoidal configuration having an apex angle formed at the center of the center electrode, circumscribing a front periphery of the insulator while maintaining an apex angle of 110 degrees or less.

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patent: 5239225 (1993-08-01), Moriya et al.
patent: 5465022 (1995-11-01), Katoh et al.
patent: 5557158 (1996-09-01), Kanao et al.

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