Compact structure of spark plug designed to ensure desired...

Details Compact structure of spark plug designed to ensure desired... Compact structure of spark plug designed to ensure desired...

2007-11-20

2007-11-20

Williams, Joseph (Department: 2879)

Electric lamp and discharge devices

Spark plugs

Particular electrode structure or spacing

C313S118000

Reexamination Certificate

active

11288398

ABSTRACT:
A spark plug for an internal combustion engine is provided which has a center electrode made up of an oxidation resistant alloy-made portion and a thermal conductive metal-made portion. The oxidation resistant alloy-made portion occupies at least a top portion of the center electrode exposed outside a porcelain insulator. The thermal conductive metal-made portion is exposed to a portion of an outer periphery of the center electrode which faces a insulator mount portion of a spark-mounting shell through the porcelain insulator in a direction perpendicular to an axial direction of the center electrode, thereby facilitating transfer or dispersal of heat from the center electrode to the mounting shell through the porcelain insulator to ensure a desired heat range.

REFERENCES:
patent: 7164225 (2007-01-01), Yoshimoto et al.
patent: 5-13147 (1993-01-01), None

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