Spark plug and method of producing the same

Details Spark plug and method of producing the same Spark plug and method of producing the same

1994-06-16

1996-09-17

O'Shea, Sandra L.

Electric lamp and discharge devices

Spark plugs

Particular electrode structure or spacing

313142, 313144, 313169, 313139, H01T 1320, H01T 1322, H01J 1356

Patent

active

055571581

ABSTRACT:
A spark plug which realizes reliability against thermal stress even in a case where dissimilar noble metal materials are disposed on the tip portion of the center electrode opposing the ground electrode and which realizes improved productivity while assuring durable reliability. The spark plug includes a center electrode electrically insulated from a housing and having a small-diameter portion at a tip portion which has a diameter smaller than that of a main body of the center electrode and composed of similar kinds of material as the center electrode, and a round-shape material, which is formed into a cylindrical or a ring shape, composed of dissimilar metal material. The round-shape material is fitted to the small-diameter portion of the center electrode so as to form a minute clearance between an inner surface of the round-shape material and is fixed to the center electrode by a large diameter portion which is integrally formed on a tip portion of the center electrode such that the minute clearance is kept between the round-shape material and the center electrode.

REFERENCES:
patent: 1657599 (1928-01-01), Yeker
patent: 3958144 (1976-05-01), Franks
patent: 4705486 (1987-11-01), Myers et al.
patent: 4725254 (1988-02-01), Moore et al.

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