Spark plug having a noble metal electrode portion

Details Spark plug having a noble metal electrode portion Spark plug having a noble metal electrode portion

1993-08-13

1996-03-05

O'Shea, Sandra L.

Electric lamp and discharge devices

Spark plugs

Particular electrode structure or spacing

445 7, H01T 1320, H01T 2102

Patent

active

054970458

ABSTRACT:
In a spark plug, a cylindrical metallic shell has a tubular insulator in which a columnar center electrode is place, a front end of the center electrode extending beyond the insulator. A nobel metal portion is thermally bonded to an outer wall of the front end of the center electrode by means of laser beams so as to form a spark gap between the noble metal portion and a ground electrode which is extended from the metallic shell. The noble metal portion has a molten alloy layer in which the center electrode is melted into the noble metal portion, and a diffused alloy layer in which the noble metal portion is diffused into the center electrode, so that the molten alloy layer forms a spark discharge surface against a front end of the ground electrode.

REFERENCES:
patent: 4436560 (1984-04-01), Fujita et al.
patent: 4700103 (1987-10-01), Yamaguchi et al.
patent: 4786267 (1988-11-01), Toya et al.
patent: 4893051 (1990-01-01), Kondo
patent: 4912544 (1990-04-01), Onuki et al.
patent: 4963112 (1990-10-01), Benedikt et al.
patent: 5273474 (1993-12-01), Oshima et al.
patent: 5395273 (1995-03-01), Matsutani

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