Spark plug with center electrode having high heat...

Details Spark plug with center electrode having high heat... Spark plug with center electrode having high heat...

2011-05-17

2011-05-17

Roy, Sikha (Department: 2879)

Electric lamp and discharge devices

Spark plugs

Particular electrode structure or spacing

C313S144000, C313S145000, C123S1690EB, C123S1690EL

Reexamination Certificate

active

07944134

ABSTRACT:
A spark plug including: a center electrode including an electrode base member and a core member; an electrode tip joined to the center electrode via a molten bond; an insulator holding the center electrode; a metal shell holding the insulator; and a ground electrode joined to the metal shell. Relationships d≦2.1 [mm] and −0.09×d+0.33<Vb/(Va+Vb)<−0.2×d+0.75 are satisfied, where d is an outer diameter of the center electrode at a position 4 mm closer to the base end of the center electrode from the base end of the molten bond in the axial direction, and Va and Vb are volumes of the electrode base member and the core member, respectively, at a region between the base end of the molten bond and the position in the axial direction.

REFERENCES:
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patent: 6528929 (2003-03-01), Matsutani et al.
patent: 6864622 (2005-03-01), Matsutani et al.
patent: 7382084 (2008-06-01), Yoshimoto et al.
patent: 7569978 (2009-08-01), Tinwell
patent: 2006/0113883 (2006-06-01), Kanao
patent: 5-159853 (1999-03-01), None
patent: 2006-156110 (2006-06-01), None
Notification of Reasons for Refusal issued Dec. 21, 2010 in counterpart Japanese Application No. 2007-301852.

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