Spark plug with heat conducting sleeve for center electrode

Details Spark plug with heat conducting sleeve for center electrode Spark plug with heat conducting sleeve for center electrode

1981-04-13

1983-05-17

Demeo, Palmer C.

Electric lamp and discharge devices

Spark plugs

Particular electrode structure or spacing

H01T 1320

Patent

active

043842348

ABSTRACT:
A spark plug particularly suitable for use with internal combustion engines includes a center electrode comprising a composite body having a core of metal which has a high degree of corrosion resistance and resistance to arc erosion such as a nickel material metallurgically bonded to a sleeve of metal which has a high degree of thermal conductivity such as a copper material. Specific embodiments relate to difference electrode tip configurations including one in which the copper and nickel are coextensive and others in which the core extends beyond the sleeve. In certain embodiments the copper sleeve is shielded from the combustion chamber by disposing a layer of material, which may be of the same material as the core and may be made integrally therewith or attached thereto, contiguous to the copper material. Extra erosion and corrosion protection can be obtained by providing a thin coating of material around the copper sleeve.

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patent: 3803892 (1974-04-01), Yamaguchi et al.
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