Spark plug for internal combustion engine

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

1997-03-24

1999-10-05

O'Shea, Sandra

Electric lamp and discharge devices

Spark plugs

Particular electrode structure or spacing

313141, 313143, 313144, 313145, 123169EL, H01T 1320, H01T 1322, H01T 1334, H01T 1336

Patent

active

059629576

ABSTRACT:
By heating a glass sealing material, a center electrode is sealed and fixed within an axial bore of an insulator. Formation of a groove in a head portion of the center electrode makes it possible to protect the head portion of the center electrode from deformation under a pressure which is applied upon filling the glass sealing material in a powder form in the axial bore. The glass sealing material is therefore assured to flow to a peripheral side wall of a flange portion of the center electrode, thereby enhancing mechanical engagement between the center electrode and the insulator, that is, uniting strength for them. A spark plug is hence obtained with improved impact resistance and accordingly, with sufficient durability.

REFERENCES:
patent: 3139553 (1964-06-01), Schwartzwalder
patent: 3346760 (1967-10-01), Jalbing et al.
patent: 3538021 (1970-11-01), Achey
patent: 3577355 (1971-05-01), Blum
patent: 4814665 (1989-03-01), Sakura et al.
patent: 5760533 (1998-06-01), Saiki et al.
Patent Abstracts of Japan, vol. 014, No. 429 (E-0978), Sep. 14, 1990 & JP 02 165587A (NGK Spark Plug Co Ltd), Jun. 26, 1990--Abstract.

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