Spark plug with multiple ground electrodes

Details Spark plug with multiple ground electrodes Spark plug with multiple ground electrodes

2007-01-30

2007-01-30

Patel, Ashok (Department: 2879)

Electric lamp and discharge devices

Spark plugs

Particular electrode structure or spacing

C313S142000

Reexamination Certificate

active

11197747

ABSTRACT:
A spark plug according to the present invention includes a metal shell, an insulator, a cylindrical center electrode, a first ground electrode, and a second ground electrode. The first ground electrode is aligned with the center electrode in the axial direction of the center electrode to form a first spark gap, across which normal sparks are discharged when the insulator is not fouled with carbon. The second ground electrode is aligned with the center electrode in the radial direction of the center electrode to form a second spark gap, across which side sparks are discharged when the insulator is fouled with carbon. The spark plug has an improved structure where dimensional parameters A, T, B, C, L, D, and E are specified to be in suitable ranges that are determined through experimental investigation. The improved structure ensures a high ignition capability and a long service life of the spark plug.

REFERENCES:
patent: 6229253 (2001-05-01), Iwata et al.
patent: 6316868 (2001-11-01), Ishino et al.
patent: 2003/0085643 (2003-05-01), Matsubara
patent: 2004/0080252 (2004-04-01), Ito et al.
patent: 2005/0264153 (2005-12-01), Hanashi
patent: 2000-68032 (2000-03-01), None
patent: 2001-160475 (2001-06-01), None

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