Spark plug having horizontal discharge gap

Details Spark plug having horizontal discharge gap Spark plug having horizontal discharge gap

1994-04-08

1996-03-26

O'Shea, Sandra L.

Electric lamp and discharge devices

Spark plugs

Particular electrode structure or spacing

313118, H01T 1320

Patent

active

055023517

ABSTRACT:
The tip 10 of the center electrode 1 is opposed to the ground electrodes 21 and 22. The tip 10 has flat faces 111 and 121 opposed to the discharge faces of the ground electrodes 211 and 221, and inclined faces 101 and 102 extending from the flat faces to the base 19. The flat faces have noble metal pieces 31 and 32 at positions opposed to the discharge faces. The discharge faces have a spark gap G between itself and the noble metal piece, a minimum gap A between itself and the inclined face, and a minimum gap B between itself and the tip face 41 of the insulator 4. The spark gap G, minimum gap A, and minimum gap B are related such that the distance of A.gtoreq.1.2.times.the distance of G, and the distance of B.gtoreq.the distance G. The axial length L of the flat face and the area S of a cross section perpendicular to the flat face should, preferably, have the relation S/L.gtoreq.0.7.

REFERENCES:
patent: 2391456 (1945-12-01), Hensel
patent: 4329615 (1982-05-01), Tanaka et al.
patent: 4465952 (1984-08-01), Sato et al.
patent: 4540910 (1985-09-01), Kondo et al.
patent: 4904216 (1990-02-01), Kagawa et al.
patent: 4970426 (1990-11-01), Bronchart
patent: 5051651 (1991-09-01), Kashiwara et al.
patent: 5239225 (1993-08-01), Moriya et al.

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