Spark plug having vanadium oxide islands on central insulator

Details Spark plug having vanadium oxide islands on central insulator Spark plug having vanadium oxide islands on central insulator

1978-10-12

1981-02-10

Segal, Robert

Electric lamp and discharge devices

Spark plugs

Shaped electrode chamber, insulator end, shell skirt, baffle...

313141, H01T 1320

Patent

active

042504260

ABSTRACT:
A spark plug, wherein a central electrode is electrically insulated from an uter electrically-conductive casing (ground to an internal combustion engine when in use) by an insulator sealed in the casing, separating the central electrode from the casing and having a taper-nose portion which is designed to be exposed to unburnt carbon in combustion gases of a combustion chamber, is modified to facilitate carbon removal from the taper-nose portion. Discrete isolated particles or isolated aggregates of particles of vanadium oxide are adhered over the exposed surface of the taper-nose portion to improve the self-cleaning ability of the spark plug without decreasing the degree of electrical insulation provided by the insulator. The particles of vanadium oxide are formed from a suspension which is applied to the surface of the taper-nose portion of the spark plug. The resulting coating is then dried in situ. Further heating results in having vanadium oxide particles, in insular form, firmly adhered to the surface of the taper-nose portion.

REFERENCES:
patent: 2899585 (1959-08-01), Dollenberg
patent: 3252034 (1966-05-01), Preist et al.
patent: 3365605 (1968-01-01), Linstedt

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