Method for manufacturing spark plug, and spark plug

Details Method for manufacturing spark plug, and spark plug Method for manufacturing spark plug, and spark plug

2005-06-21

2005-06-21

Patel, Vip (Department: 2879)

Electric lamp and discharge devices

Spark plugs

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

C313S144000

Reexamination Certificate

active

06909226

ABSTRACT:
An insulator (2) is inserted into a metallic shell (1) in the direction of an axis O, and a sealing material powder (160) is charged into a circumferential gap (20) formed between the inner circumferential surface of a rear end portion of the metallic shell (1) and the outer circumferential surface of the insulator (2). The compressed sealing-material-powder layer (61) contains talc in an amount of from 75% to 99.7% by mass and at least one of magnesite and dolomite in an amount of from 0.3% to 25% by mass, and satisfies 0.5≦M≦1.3 and 0.5≦L≦2×(M×4.5), wherein L in mm represents height as measured in the direction of the axis O, and M in mm represents thickness as measured radially with respect to the axis O.

REFERENCES:
patent: 6414420 (2002-07-01), Suzuki
patent: 1022829 (2000-07-01), None

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