Spark plug

Details Spark plug Spark plug

2007-06-12

2007-06-12

Patel, Nimeshkumar D. (Department: 2879)

Electric lamp and discharge devices

Spark plugs

Particular electrode structure or spacing

C313S140000

Reexamination Certificate

active

11013355

ABSTRACT:
A spark plug including an insulator having an axial hole in an axial direction of the spark plug; a center electrode disposed in a tip end side of the axial hole of the insulator; a metal shell surrounding the insulator; a first ground electrode including a first ground electrode body having one end joined to the metal shell, and a noble metal tip joined to an inner side face of another end portion of the first ground electrode body and disposed opposite a tip end face of the center electrode across a first discharge gap. One end of the second ground electrode is bonded to the metal shell, and the another end is disposed opposite a side peripheral face of said center electrode or a side peripheral face of said insulator across a second discharge gap. Furthermore, the spark plug is characterized as having a distance t and an included angle θ as defined herein.

REFERENCES:
patent: 2002/0067111 (2002-06-01), Shibata et al.
patent: 2003/0085643 (2003-05-01), Matsubara

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