Spark electrode having low thermal stress

Details Spark electrode having low thermal stress Spark electrode having low thermal stress

1992-12-11

1996-01-30

O'Shea, Sandra L.

Electric lamp and discharge devices

Spark plugs

Particular electrode structure or spacing

313142, H01T 1320

Patent

active

054882621

ABSTRACT:
A spark discharge tip, such as for a spark plug for an internal combustion engine in which the life of the tip is prolonged. A composite material is formed by bonding a material for a discharge layer, mainly composed of platinum, to a material for a thermal stress relieving layer, which is an alloy mainly composed of platinum, and having a coefficient of thermal expansion between that of the electrode and that of the discharge layer. A composite tip is formed by stamping the composite material into a columnar shape from the discharge layer side so that the periphery of the interface between the discharge layer and stress relieving layer is covered by the discharge layer. The composite tip is then resistance welded to the electrode.

REFERENCES:
patent: 4122366 (1978-10-01), Von Stutterheim et al.
patent: 4540910 (1985-09-01), Kondo et al.
patent: 4670684 (1987-06-01), Kagawa et al.

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