SPARK PLUG ELECTRODE CONFIGURATION

摘要

A spark plug (10) includes an electrode tip assembly (36) located at an axially- facing free end surface (24, 32) of an electrode body (20, 30). The electrode tip assembly includes an electrode tip body (38) and a firing tip (40) and has a longitudinal axis (42) that is generally perpendicular to a longitudinal axis (22, 34) of the electrode body. The electrode tip body may be a Ni-alloy piece and is attached to the electrode body, and the firing tip may be an Ir-alloy piece with a sparking surface (44) that faces a spark gap (G). The electrode body may include a groove (50) formed in the axially- facing free end surface that is useful to help position the electrode tip assembly for attachment. The spark gap can be formed between opposing electrode tip assemblies, and the size of the spark gap can be adjusted during assembly without the need for bending the electrode body.