Spark plug for internal combustion engine

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

2007-03-14

2010-11-23

Patel, Nimeshkumar D (Department: 2879)

Electric lamp and discharge devices

Spark plugs

Particular electrode structure or spacing

Reexamination Certificate

active

07839064

ABSTRACT:
A spark plug including: a center electrode as defined herein; a substantially cylindrical insulator as defined herein; a cylindrical metal shell as defined herein; and a ground electrode as defined herein, wherein a spark discharge gap is provided between the leading end portion of the center electrode and the leading end portion of the ground electrode, and the ground electrode has a bulging curved face on a side opposite to a side in which the center electrode is provided, and a maximum of width of the ground electrode within a range of ±1 mm from a center point of the spark discharge gap in the axial direction, as viewed in a direction where the center electrode and the ground electrode overlap, is 105% or less of a width of an ordinary portion having a substantially constant width.

REFERENCES:
patent: 6208066 (2001-03-01), Kokubu et al.
patent: 2002/0038992 (2002-04-01), Morita et al.
patent: 5-13146 (1993-01-01), None
patent: 11-121142 (1999-04-01), None
Machine translation of JP 2005-108794.

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