Spark plug with high capability to ignite air-fuel mixture

Details Spark plug with high capability to ignite air-fuel mixture Spark plug with high capability to ignite air-fuel mixture

2005-08-05

2008-08-05

Patel, Nimeshkumar D. (Department: 2879)

Electric lamp and discharge devices

Spark plugs

Shaped electrode chamber, insulator end, shell skirt, baffle...

Reexamination Certificate

active

07408294

ABSTRACT:
A spark plug according to the invention includes a metal shell, a hollow insulator, a center electrode, and a ground electrode. The insulator has a first end protruding into a combustion chamber of an engine and a second end opposite to the first end in the lengthwise direction of the insulator. The insulator increases in outer diameter from the edge of the inner surface thereof at the first end to a reference plane that is defined to extend perpendicular to the lengthwise direction of the insulator and away 0.1 mm from the edge of the inner surface of the insulator toward the second end of the same in the lengthwise direction. Further, a first volume V1, which is the volume of a portion of the insulator between the edge of the inner surface of the insulator and the reference plane, is in the range of 0.15 to 0.38 mm3.

REFERENCES:
patent: 6552476 (2003-04-01), Hanashi et al.
patent: 6559579 (2003-05-01), Ito et al.
patent: 7262547 (2007-08-01), Klett et al.
patent: 764 397 (1951-08-01), None
patent: 101 56 949 (2003-06-01), None
patent: 60-235379 (1985-11-01), None
German Office Action issued on Feb. 19, 2007 in corresponding German Application No. 10 2005 036 971.5-23, together with a English translation.

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