Compact spark plug with high gas tightness

Details Compact spark plug with high gas tightness Compact spark plug with high gas tightness

2008-07-15

2008-07-15

Santiago, Mariceli (Department: 2879)

Electric lamp and discharge devices

Spark plugs

Shaped electrode chamber, insulator end, shell skirt, baffle...

C313S144000, C313S141000

Reexamination Certificate

active

11188772

ABSTRACT:
A spark plug has a compact structure where a threaded portion of a metal shell has a size of M10 or M12 and the width between any two opposite side surfaces of a polygonal prism-shaped portion of the metal shell is no greater than 14 mm. In the spark plug, a thickness A of the polygonal prism-shaped portion of the metal shell, a thickness B of a crimped portion of the metal shell, and a thickness C of a buckled portion of the metal shell are subject to a dimensional relationship of A>B>C. Through specifying such a relationship, the crimped portion of the metal shell exerts a large constricting force on sealing members provided in a gap between the inner surface of the polygonal prism-shaped portion of the metal shell and the outer surface of an insulator, thereby securing high gas tightness of the spark plug.

REFERENCES:
patent: 6707237 (2004-03-01), Teramura et al.
patent: 2005/0110381 (2005-05-01), Kanao
patent: 1022829 (2000-07-01), None
patent: 1209784 (2002-05-01), None
patent: 1324446 (2003-07-01), None
patent: 1341281 (2003-09-01), None
patent: 2001-307858 (2001-11-01), None

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