Spark plug and method for manufacturing the spark plug

Details Spark plug and method for manufacturing the spark plug Spark plug and method for manufacturing the spark plug

2005-02-01

2005-02-01

Patel, Ashok (Department: 2879)

Electric lamp and discharge devices

Spark plugs

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

C313S144000

Reexamination Certificate

active

06849995

ABSTRACT:
A spark plug configured such that a metallic shell is joined to an insulator through hot-crimping. The metallic shell is firmly joined to the insulator by means of a sufficient fastening force even when the diameter of the spark plug is reduced, to thereby enhance gastightness and vibration resistance. A rear end portion of a metallic shell (1) is hot-crimped toward an insulator (2) to form a curved, crimped portion (1d). The inside diameter of an insulator insertion hole (40) of the metallic shell (1) is 8-12 mm. The cross-sectional area S of the metallic shell (1) as measured when the metallic shell (1) is cut by plane A—A perpendicular to the axis O at position (1i) where the inner wall surface of the insulator insertion hole (40) transitions to the inner wall surface of the crimped portion (1d) with respect to the direction of axis O of the metallic shell (1), and the carbon content of a steel material used to form the metallic shell (1) satisfy either of the following conditions A and B: condition A: 15≦S<25 mm2and a carbon content of 0.20%-0.45% by weight; and condition B: 25≦S<35 mm2and a carbon content of 0.15%-0.45% by weight. A method for manufacturing the spark plug is also disclosed.

REFERENCES:
patent: 2308968 (1943-01-01), Douglas
patent: 5695704 (1997-12-01), Sugiura et al.
patent: 20030155850 (2003-08-01), Suzuki
patent: 63-148585 (1988-06-01), None
patent: 63-266046 (1988-11-01), None
patent: 2-70019 (1990-03-01), None

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