Spark plug

Details Spark plug Spark plug

H - Electricity

01

T

H01T 13/20 (2006.01) H01T 13/06 (2006.01) H01T 13/39 (2006.01)

Patent

CA 2320415

In a spark plug 100, when a side of the spark plug 100 in which a spark discharge gap g is formed in an axial direction of a center electrode 3 is a front side thereof by definition, a distance "a" along the axial direction from the surface of one end of a metallic shell 1, with which one end of a ground electrode 4 is joined, to the outermost point of a front end portion of the ground electrode 4 is 6 mm or more and at least a surface layer portion of the ground electrode 4 is made from a sulfur corrosion resistant metal. As the sulfur corrosion resistant metal, an iron-based alloy can be employed, containing: iron as a main component: and at least one of chromium and cobalt in total content of 10 mass % or more. The spark plug is hard to suffer electrode consumption through a reaction with a sulfur constituent or other inconveniences even in a working environment in which contact with the sulfur constituent at a high concentration can arise and thereby, capable of ensuring a sufficiently long lifetime of an electrode even when being employed in a direct-injection type engine or the like.

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