Electric lamp and discharge devices – Spark plugs – Particular electrode structure or spacing
Patent
1990-09-06
1992-03-31
DeMeo, Palmer C.
Electric lamp and discharge devices
Spark plugs
Particular electrode structure or spacing
313 115, H01T 1320
Patent
active
051011352
ABSTRACT:
In a spark plug for use in an internal combustion engine, a nickel-alloy based center electrode is placed into a metallic shell through a tubular insulator. An outer electrode is depended from the metallic shell to from a spark gap with a front end of the center electrode. A spark portion is secured to the center electrode, and comprising a nickel-alloy based tubular clad tip and an iridium or iridium-alloy based inner core fit into the clad tip. A rear open end of the clad tip is welded to a front end surface of the center electrode. A dimensional relationship among the center electrode, the inner core and the clad tip being determined as follows: A.ltoreq.1.5mm, 0.2mm.ltoreq.B.ltoreq.0.8mm, C.gtoreq.0.1mm, where A is an outer diameter of the front end surface of the center electrode, B is an outer diameter of the inner core, while C is an outer diameter of the tubular clad tip.
REFERENCES:
patent: 2391456 (1945-12-01), Hensel
patent: 2391457 (1945-12-01), Carlson
patent: 3407326 (1968-10-01), Romine
patent: 3984717 (1976-10-01), Romanowski et al.
patent: 4439708 (1984-03-01), Hattori et al.
patent: 4488081 (1984-12-01), Kondo et al.
patent: 4581558 (1986-04-01), Takamura et al.
patent: 4910428 (1990-03-01), Strumbos
DeMeo Palmer C.
NGK Spark Plug Co. Ltd.
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