Center electrode structure for spark plug

Details Center electrode structure for spark plug Center electrode structure for spark plug

1987-10-13

1989-02-28

Ramsey, Kenneth J.

Electric lamp or space discharge component or device manufacturi

Process

Spark plug or spark gap making

313141, H01T 1316, H01T 1339

Patent

active

048081353

ABSTRACT:
In a center electrode structure for spark plug including a tublar insulator, the inner side of which has a stepped shoulder to provide a diameter-reduced bore therein; a center electrode having a flange, and concentrically placed into the insulator with the flange engaging against the shoulder, and with one end being axially through the bore so as to be exposed to outside of the insulator; the center electrode having an electrically conductive core of copper or copper-based alloy which is encased into an enclosure made of oxidation and heat resistant nickel-based alloy; and the core being provided with a number of fractures in its granular structure so as to absorb thermal stress due to the thermal expansional difference between the core and enclosure.

REFERENCES:
patent: 2406966 (1946-09-01), Pfeil
patent: 3548472 (1970-12-01), Urushiwara et al.
patent: 3857145 (1974-12-01), Yamaguchi et al.
patent: 4093887 (1978-06-01), Corbach et al.
patent: 4400643 (1983-08-01), Nishio et al.
patent: 4684352 (1987-08-01), Clark et al.

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