Spark plug for internal combustion engine

Details Spark plug for internal combustion engine Spark plug for internal combustion engine

1991-08-08

1992-04-28

DeMeo, Palmer C.

Electric lamp and discharge devices

Spark plugs

Plural part insulating means

313143, 313131A, H01T 1320, H01T 1338

Patent

active

051091780

ABSTRACT:
A spark plug for an internal combustion engine is disclosed. A semiconductor material having a resistance of 5.times.10.sup.2 -5.times.10.sup.4 M.OMEGA./mm is coated or baked in the form of a band on the peripheral surface of a basal part of a leg portion of an insulator of the spark plug. Preferably, at least the basal part of the leg portion, including the band, is covered with a water-repellant insulating coating. An inner wall of a metal shell of the spark plug is desirably coated with a water-repellant material at an area facing at least the peripheral surface of the basal part of the leg portion of the insulator.

REFERENCES:
patent: 3365605 (1968-01-01), Linstedt
patent: 4267483 (1981-05-01), Nakajima et al.
patent: 4337408 (1982-06-01), Sone et al.
patent: 4415828 (1983-11-01), Mizuno et al.
patent: 4427914 (1984-01-01), Mizuno et al.
patent: 4937484 (1990-06-01), Ishino
Patent Abstracts of Japan, vol. 2, No. 78 (M-78) (1860) Jun. 21, 1978, and JP-A-53 43142 (Nippon Tokushu Togyo K.K.) Apr. 19, 1978.

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