Spark plug for internal combustion engine

Details Spark plug for internal combustion engine Spark plug for internal combustion engine

2011-03-15

2011-03-15

Hines, Anne M (Department: 2879)

Electric lamp and discharge devices

Spark plugs

Particular electrode structure or spacing

C313S118000, C313S143000

Reexamination Certificate

active

07906894

ABSTRACT:
A spark plug includes a ground electrode formed with a flat region and a convex curved region on an outer peripheral surface thereof. The flat region is located on a front end of the ground electrode and has a length of 0.2 mm or more from a front end face of the ground electrode in a longitudinal direction of the ground electrode. The ground electrode satisfies the following dimensional condition (1) with respect to first and second cross sections of the ground electrode taken through the convex curved region and the flat region in directions perpendicular to the longitudinal direction of the ground electrode,in-line-formulae description="In-line Formulae" end="lead"?0.950≦(S2/L2)/(S1/L1)≦0.995   (1)in-line-formulae description="In-line Formulae" end="tail"?where S1is the area of the first cross section; L1is the perimeter of the first cross section; S2is the area of the second cross section; and L2is the perimeter of the second cross section.

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