Patent ID: 8796909
Filing Date: 2014-08-05
Classification: H01T

Abstract:
1. An igniter plug comprising: a center electrode, an insulator having an axial bore extending in an axial direction and accommodating the center electrode therein, and a ground electrode accommodating the insulator therein in such a manner as to form a first space between the ground electrode and at least a portion of an outer circumferential surface of the insulator, wherein the ground electrode has a ground electrode forward-end portion which forms a gap in cooperation with the center electrode; with a side toward the gap being taken as a forward side along the axial direction, the ground electrode has an inlet for supplying cooling fluid therethrough to the first space, and a first outlet located forward of the inlet and radially outward of an inner circumference of the ground electrode forward-end portion and adapted to discharge the cooling fluid therethrough; and a second space communicating with the first space and having a second outlet for discharging the cooling fluid therethrough is formed between an insulator end surface, which is a forward end surface of the insulator, and a ground electrode counter surface, which is a surface of the ground electrode which faces the insulator end surface.