Spark plug having a platinum tip on an outer electrode

Details Spark plug having a platinum tip on an outer electrode Spark plug having a platinum tip on an outer electrode

1997-08-20

1999-02-02

O'Shea, Sandra

Electric lamp and discharge devices

Spark plugs

Particular electrode structure or spacing

313142, 313144, H01T 1320, H01T 1322, H01T 1334, H01T 1336

Patent

active

058669736

ABSTRACT:
A spark plug is provided having a center electrode disposed in a metallic shell through an insulator so that the front end of the center electrode forms a spark gap with an outer electrode. A platinum tip is secured to the outer electrode positioned to oppose the front end of the center electrode. The outer electrode is provided with a heat-conductive core metal cladded with a matrix metal which is made of a nickel-based alloy containing 10-20 wt. % chromium. The platinum tip is welded to the outer electrode to form a welded portion between the platinum tip and the outer electrode and the platinum tip is positioned to terminate slightly short of the core metal so that the distance between a circumferential edge of the welded portion and a front end of the core metal is in the range 0.0 mm-2.0 mm measured lengthwise along direction the outer electrode.

REFERENCES:
patent: 2001888 (1935-05-01), Randolph et al.
patent: 4581558 (1986-04-01), Takamura et al.
patent: 4970426 (1990-11-01), Bronchart
patent: 5210457 (1993-05-01), Oshima et al.

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