Spark plug with center electrode having variable diameter portio

Details Spark plug with center electrode having variable diameter portio Spark plug with center electrode having variable diameter portio

1996-11-15

1999-07-27

Patel, Nimeshkumar D.

Electric lamp and discharge devices

Spark plugs

Particular electrode structure or spacing

313139, H01T 1314, H01T 1352

Patent

active

059295562

ABSTRACT:
In a spark plug in use for an internal combustion engine, a ground electrode is secured to a front end of the metal shell so that a front end surface of the ground electrode faces an elevational side of a front end of the center electrode to cause semi-creeping spark discharges therebetween along a front end surface of the insulator. A front end portion of the center electrode has an electrode base in the axial bore and an electrode front defined diametrically smaller than the electrode base by way of a diameter-variable portion. A diametrical difference between an initial point of the diameter-variable portion of the center electrode and the axial bore of the insulator is 1 mm or less, and the initial point of the diameter-variable portion is retracted by 0.0 mm-1.0 mm from the front end surface of the insulator.

REFERENCES:
patent: 3870918 (1975-03-01), Senda et al.
patent: 4845400 (1989-07-01), Takamura et al.
patent: 5124612 (1992-06-01), Takamura et al.
patent: 5159232 (1992-10-01), Sato et al.
patent: 5239225 (1993-08-01), Moriya et al.
patent: 5574329 (1996-11-01), Kagawa
patent: 5581145 (1996-12-01), Kato et al.

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