Center electrode structure for spark plug

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

1987-09-11

1989-03-21

Moore, David K.

Electric lamp and discharge devices

Spark plugs

Particular electrode structure or spacing

313145, 313 115, H01T 1320

Patent

active

048146650

ABSTRACT:
In a center electrode structure for spark plug including a tubular 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 a highly heat 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 providing its overall outer surface with a thin oxidation layer, so that the core is clad with the enclosure through the oxidation layer by means of extrusion.

REFERENCES:
patent: 3119944 (1964-01-01), Lentz et al.
patent: 4314392 (1982-02-01), Waite
patent: 4575343 (1986-03-01), Kin et al.

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