Small size spark plug having side spark prevention

Details Small size spark plug having side spark prevention Small size spark plug having side spark prevention

2007-01-16

2007-01-16

Williams, Joseph (Department: 2879)

Electric lamp and discharge devices

Spark plugs

Particular electrode structure or spacing

C313S143000

Reexamination Certificate

active

10937432

ABSTRACT:
A spark plug including an insulator having an axial hole in an axial direction; and a center electrode disposed in a tip end side of the axial hole of the insulator so as to project a tip end of the center electrode from the tip end side of the insulator. The center electrode includes an electrode base member made of pure Ni or an Ni alloy containing 85 wt % or more of Ni; and a noble metal chip fixed to a tip end of the electrode base. The spark plug further includes a metal shell surrounding the insulator; and a ground electrode in which one end is joined to the metal shell, and another end portion opposes the noble metal chip to form a spark discharge gap between the ground electrode and noble metal chip, wherein M, D1, and D2as defined herein satisfy M≦10.1 mm, 0.5 mm≦D2<1.4 mm, and D1/D2≧3.5.

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patent: 09-219274 (1997-08-01), None
patent: 2000-243535 (2000-09-01), None

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