Spark plug having a plurality of center electrodes

Details Spark plug having a plurality of center electrodes Spark plug having a plurality of center electrodes

2007-10-16

2007-10-16

Patel, Nimeshkumar D. (Department: 2879)

Electric lamp and discharge devices

Spark plugs

Particular electrode structure or spacing

C313S143000

Reexamination Certificate

active

10986307

ABSTRACT:
A spark plug according to the invention includes a tubular metal shell, a cylindrical insulator, a plurality of center electrodes, and a plurality of ground electrodes. The meal shell has an end portion in which a plurality of thick-walled portions and a plurality of thin-walled portions are formed. The insulator is fixed in the metal shell. The center electrodes each are retained within one of a plurality of axial bores in the insulator. The ground electrodes each are joined to one of the thick-walled portions to ensure sufficient strength of the ground electrodes. The thin-walled portions each have an inner surface that is outwardly recessed in an angular range including the intersection of the inner surface with a reference line, thereby securing sufficient air pocket size of the spark plug. Accordingly, the spark plug has a high capability to ignite the air-fuel mixture and sufficient strength of the ground electrodes.

REFERENCES:
patent: 1560512 (1925-11-01), Hirsch
patent: 1560513 (1925-11-01), Hirsch
patent: 2188915 (1974-01-01), None
patent: 57-193777 (1982-11-01), None
French Search Report—Nov. 11, 2005.
Patent Abstracts of Japan, vol. 007, No. 044, (M-195), Feb. 22, 1983 & JP 57 193777 A(Nissan Jidosha KK), Nov. 29, 1982.

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