H - Electricity – 01 – T
Patent
H - Electricity
01
T
H01T 13/39 (2006.01) H01T 21/02 (2006.01)
Patent
CA 2574761
An ignition device such as a spark plug (10) having center and ground electrodes (16, 18), at least one of which includes a firing tip (20, 22) formed from an alloy containing iridium, rhodium, tungsten, and zirconium. With the inclusion of tungsten and zirconium in the alloy, the percentage of rhodium can be kept relatively low without sacrificing the erosion resistance or reduced sparking voltage of the firing tip. In one embodiment, the firing tip (20, 22) contains 2 wt % rhodium, 0.3 wt tungsten, 0.02 wt % zirconium, and the balance iridium.
L'invention concerne un dispositif d'allumage notamment une bougie d'allumage (10) possédant des électrodes centrales et de masse (16, 18), au moins une desquelles comprend une pointe d'allumage (20, 22) formée d'un alliage contenant de l'iridium, du rhodium, du tungstène, et du zirconium. Avec l'inclusion de tungstène et de zirconium dans l'alliage, le pourcentage de rhodium peut être maintenu relativement bas sans sacrifier la résistance d'érosion ou la tension d'allumage réduite de la pointe d'allumage. Dans l'un des modes de réalisation, la pointe d'allumage (20, 22) contient 2% en poids de rhodium, 0,3 % en poids de tungstène, 0,02 % en poids de zirconium, et le reste en iridium.
Coupland Duncan R.
Hyde Robin
Orjela Gurdev
Tinwell Paul
Federal Mogul Ignition Company (uk) Limited
Finlayson & Singlehurst
Johnson Matthey Public Limited Company
LandOfFree
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