Spark plug for an otto-type internal combustion engine

Details Spark plug for an otto-type internal combustion engine Spark plug for an otto-type internal combustion engine

1986-02-28

1987-09-08

DeMeo, Palmer C.

Electric lamp and discharge devices

Spark plugs

Non-conducting material in or adjacent gap

313144, H01T 1320

Patent

active

046926577

ABSTRACT:
To reduce erosion of a platinum-containing electrode layer (3, 14) applied to the end face of the center insulator (1, 11) of the spark plug, a protective layer of ceramic, preferably aluminum oxide, is applied over the electrode. The aluminum oxide protective is sufficiently thin to permit arc-through or spark-through of the spark from a counter electrode (9, 19). This permits reduction of the thickness of the electrode layer to between about 5 to 15 micrometers, preferably about 8 to 10 micrometers, with a thickness of the protective layer of between 5 to 50 micrometers, preferably about 8 to 10 micrometers. Aluminum oxide is the preferred material for the center insulator, the protective layer, as well as an additive to the center electrode if it is made of a mixture of platinum and ceramic.

REFERENCES:
patent: 2265352 (1941-12-01), Corbin et al.
patent: 2900547 (1959-08-01), Engel
patent: 4539503 (1985-09-01), Esper et al.
Bosch advertisement for "Platinum Spark Plug".
J. C. Whitney & Co cataloge; p. 172.

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