Spark plug

Details Spark plug Spark plug

1997-01-14

1999-01-12

O'Shea, Sandra

Electric lamp and discharge devices

Spark plugs

Particular electrode structure or spacing

513118, 106 48, H01T 1320, H01T 1300, F02M 5706, F02P 1300

Patent

active

058594914

ABSTRACT:
A spark plug for an internal combustion engine. The spark plug includes an insulator coated with glaze in an area extending from a head portion to a trunk portion of the insulator. Preferably, the glaze is prepared from B.sub.2 O.sub.3 --SiO.sub.2 glass containing two or more oxides selected from the group consisting of Al.sub.2 O.sub.3, Na.sub.2 O, CaO, ZnO, BaO, Li.sub.2 O and Bi.sub.2 O.sub.3. The glaze is prepared by dry-mixing a plurality of powder materials, melting the resultant mixture in water for vitrification, wet-powdering the resultant vitrification, and adding an organic binder to the resultant powder. The glaze is applied to the insulater and fired at a glost temperature of not more than 1150.degree. C. The Pb content of the glaze is not more than 10 wt. % in terms of PbO. Accordingly, even when a strong electric field is induced at the trunk portion of the insulator, the conversion of Pb to conductive substances is very little or zero. As a result, the flashover voltage between the terminal electrode and the metallic shell of the spark plug is less likely to decrease, thus preventing a spark failure of the spark plug.

REFERENCES:
patent: 4084976 (1978-04-01), Hinton
patent: 4120733 (1978-10-01), Knapp
patent: 4256497 (1981-03-01), Knapp
patent: 4746578 (1988-05-01), Kondo et al.
patent: 5518968 (1996-05-01), Knapp

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