Spark plug for internal combustion engines having an alloy layer

Details Spark plug for internal combustion engines having an alloy layer Spark plug for internal combustion engines having an alloy layer

1993-06-09

1995-08-08

O'Shea, Sandra L.

Electric lamp and discharge devices

Spark plugs

Particular electrode structure or spacing

313142, H01T 1320, H01T 1332

Patent

active

RE0350125

ABSTRACT:
A spark plug for an internal combustion engine including a center electrode, an earth electrode, a metal tip joined by welding to an ignition section of at least one of the center electrode and the earth electrode, and an alloy layer located at a welding portion between the metal tip and the at least one electrode. The metal tip is formed of material highly resistant to heat and wear which is distinct in the coefficient of thermal expansion from the material of the electrodes. The alloy layer is formed to have a thickness of at least about 10.mu., so as to avoid the rupture of the metal tip along the surface thereof adjacent to the welding portion.

REFERENCES:
patent: 2391456 (1944-01-01), Hensel
patent: 2416107 (1947-02-01), Litton
patent: 3548239 (1970-12-01), Eaton
patent: 3984717 (1976-10-01), Romanowski et al.
patent: 4488081 (1984-12-01), Kondo et al.

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