Spark plug, particularly for internal combustion engines having

Details Spark plug, particularly for internal combustion engines having Spark plug, particularly for internal combustion engines having

1976-11-04

1978-06-06

Grimm, Siegfried H.

Electric lamp and discharge devices

Spark plugs

Plural parallel gaps

29 2514, 313 115, 313141, H01T 1320

Patent

active

040938875

ABSTRACT:
The spark plug center electrode is a composite of a jacket of corrosion resistant material, central filamentary core electrode elements, likewise of corrosion resistant material, and a matrix of thermally and electrically highly conductive material in which the corrosion resistant filamentary elements are embedded, filling the electrode within the outer jacket; in accordance with the present invention, the matrix material is recessed with respect to the jacket and the sparking ends of the corrosion resistant filamentary material to increase lifetime and to provide protection for the electrically and thermally highly conductive material and ensure ignition of even comparatively lean fuel-air mixtures. The electrode has an overall diameter in the order of about 2.4 mm, the recess of the matrix material being between 50 to 500 .mu. m, preferably about 100 to 250 .mu. m; a platinum coating having a thickness of preferably between 40 and 50 .mu. m can be provided to cover the exposed end of the electrode. The recess can be effected by etching selective to the matrix material and not attacking the corrosion resistant jacket and filamentary elements.

REFERENCES:
patent: 2296033 (1942-09-01), Heller
patent: 2470033 (1949-05-01), Hensel
patent: 2783409 (1957-02-01), McDougal
patent: 2835726 (1958-05-01), Beesch
patent: 3356882 (1967-12-01), Hallauer et al.

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