Spark plug for an internal combustion engine

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

1996-03-27

1998-06-02

O'Shea, Sandra L.

Electric lamp and discharge devices

Spark plugs

Plural part insulating means

313135, 313140, 313141, 313142, H01T 1304, H01T 1320

Patent

active

057605335

ABSTRACT:
In a spark plug, a tubular insulator has an axial bore in which a center electrode and a terminal electrode are axially aligned, the terminal electrode having a seal portion fixedly supported by partly filling the axial bore with a glass sealant. The insulator further has a tapered shoulder portion between a diameter-reduced portion and a diameter-increased portion, each provided on the insulator. A metallic shell is placed around the diameter-increased portion of the insulator, a rear end of the metallic shell being caulked against the diameter-reduced portion of the insulator, a space between the metallic shell and the diameter-reduced portion of the insulator being filled with a ceramic powder. An inclination of the tapered shoulder portion of the insulator ranges from 10 to 45 degrees against a plane perpendicular to the terminal electrode. A roulette is formed on an outer surface of the seal portion of the terminal electrode in which the glass sealant is filled. A front end of the seal portion of the terminal electrode is located in the range of +5.0 mm to -1.0 mm from a boundary where the tapered shoulder portion meets the diameter-increased portion of the insulator.

REFERENCES:
patent: 2806971 (1957-09-01), Twells et al.
patent: 3452235 (1969-06-01), Hallauer et al.
patent: 3903453 (1975-09-01), Nishio
patent: 4029990 (1977-06-01), Nagy et al.
patent: 4460847 (1984-07-01), Englehardt
patent: 4568855 (1986-02-01), Nemeth et al.
patent: 5095242 (1992-03-01), Richeson

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