Spark plug structure

Details Spark plug structure Spark plug structure

H - Electricity

01

T

123/211

H01T 13/20 (2006.01) H01T 13/38 (2006.01)

Patent

CA 1326617

ABSTRACT A spark plug structure comprising; a cylindrical metallic shell; a joint type insulator having a center bore, and including a front piece and a rear half piece, each made of a tubular aluminum nitride (AIN), and the front and rear half pieces being joined at their respective end by means of a glass sealant, and encased into the metallic shell; a center electrode placed into the center bore of the insulator; an elongated terminal placed into the rear half piece of the insulator; an electrically conductive glass provided to seal respective spaces appeared between the center electrode, insulator and the terminal; the front half piece having an elongated projection, the length of which is more than 2.0 mm, and the rear half piece having a recess the depth of which is more than 2.0 mm, the front and rear half pieces being jointed at the projection and the recess by means of an annular glass sealant which has thickness of less than 2.0 mm and length of more than 2.0 mm.

603341

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