Spark plug with increased durability and carbon fouling...

Details Spark plug with increased durability and carbon fouling... Spark plug with increased durability and carbon fouling...

2007-07-31

2007-07-31

Williams, Joseph (Department: 2879)

Electric lamp and discharge devices

Spark plugs

Particular electrode structure or spacing

C313S118000, C313S142000, C313S143000, C313S144000, C123S14300R, C123S1690EB, C123S1690EL

Reexamination Certificate

active

11221918

ABSTRACT:
A spark plug for an internal combustion engine is provided which includes a metal shell, a porcelain insulator, a center electrode, a main ground electrode, and auxiliary ground electrodes. Each of the auxiliary ground electrodes has an inner side surface facing the center electrode through the porcelain insulator to define an auxiliary spark gap between itself and a nose of the porcelain insulator so as to occupy a minimum distance between the porcelain insulator and the auxiliary ground electrode. This avoids a great local increase in electrical field strength on the auxiliary ground electrode to minimize excessive discharge within the auxiliary spark gap to enhance carbon fouling resistance and durability of the spark plug.

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