Spark plug

Details Spark plug Spark plug

2007-04-20

2009-11-10

Ton, Toan (Department: 2889)

Electric lamp and discharge devices

Spark plugs

Particular electrode structure or spacing

C123S1690EB

Reexamination Certificate

active

07615915

ABSTRACT:
A spark plug having a protrusion amount t of not smaller than 0.3 mm and satisfying a relationθ1+θ2≦93° in which θ1is an included angle between virtual lines s1and s2, and θ2is an included angle between virtual lines s3and s4when the virtual line s1is taken as a line parallel to a direction of an axis and including the other end side edge on a leading end surface of a first precious metal tip, the virtual line s2is taken as a line connecting the other end side edge and a point of intersection between an inner circumferential surface of a ground electrode body and the other end surface of the ground electrode body, the virtual line s3is taken as a line parallel to the direction of the axis and including the other end side edge on a leading end surface of a center electrode, and the virtual line s4is taken as a line including the other end side edge and tangent to an insulator.

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