Spark plug

Details Spark plug Spark plug

2008-07-22

2008-07-22

Santiago, Mariceli (Department: 2879)

Electric lamp and discharge devices

Spark plugs

With specific joint structure

C313S119000, C313S144000

Reexamination Certificate

active

07402941

ABSTRACT:
A spark plug including a cylindrical insulator having an axial hole extending in an axial direction; a center electrode held in the axial hole on a leading end side; a connecting terminal held in the axial hole on a trailing end side; and a sealing layer provided in the axial hole and including a glass sealing material containing a glass component and a metallic component, the sealing layer including a first sealing layer containing a first glass sealing material and a second sealing layer containing a second glass sealing material laminated in an axial direction of the axial hole, the first sealing layer contacting the center electrode, and the second sealing layer contacting the connecting terminal, wherein the second glass sealing material has a fluidity higher than that of the first glass sealing material at a temperature higher than a softening point of a glass component in the sealing layer.

REFERENCES:
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patent: 6566792 (2003-05-01), Nishikawa
patent: 2002/0041136 (2002-04-01), Nishikawa
patent: 2002/0041138 (2002-04-01), Nishikawa

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