Spark plug for an internal combustion engine

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

1997-04-24

1999-03-02

O'Shea, Sandra

Electric lamp and discharge devices

Spark plugs

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

313141, H01T 1320

Patent

active

058775846

ABSTRACT:
In a spark plug, a cylindrical metal shell is provided whose inner wall has a ledge portion on which an insulator rests through its seat portion. The insulator has an axial bore in which a center electrode is placed whose front end has a heat-resistant metal tip. A ground electrode is provided to form a spark gap with the noble metal tip of the center electrode. The insulator forms an insulator nose which measures less than 15 mm in length. The heat-resistant metal tip measures less than 0.8 mm in diameter. A space between an outer surface of the center electrode and an inner wall of a front open end of the axial bore is defined to be more than 0.1 mm in width.

REFERENCES:
patent: 4700103 (1987-10-01), Yamaguchi et al.
patent: 4845400 (1989-07-01), Takamura et al.
patent: 5109178 (1992-04-01), Yoshida et al.
patent: 5124612 (1992-06-01), Takamura et al.
patent: 5159232 (1992-10-01), Sato et al.
patent: 5189333 (1993-02-01), Kagawa et al.
patent: 5204579 (1993-04-01), Oshima et al.

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