Patent ID: 6831253
Filing Date: 2004-12-14
Classification: F23Q

Abstract:
A ceramic glow plug in which a ceramic heater is fixedly disposed in a metallic, cylindrical member such that a front end thereof projects from a front end of the metallic, cylindrical member, and a resultant assembly consisting of the ceramic heater and the metallic, cylindrical member is fixedly disposed in a metallic, cylindrical plug body such that the front end of the metallic, cylindrical member projects from a front end of the metallic, cylindrical plug body,wherein a first portion of the metallic, cylindrical member which projects from the front end of the metallic, cylindrical plug body and extends over a predetermined range from the front end of the metallic, cylindrical member toward a rear end of the metallic, cylindrical member is smaller in outside diameter than a second portion of the metallic, cylindrical member which is fixedly disposed within the metallic, cylindrical plug body, said metallic, cylindrical member has a diameter transition region where the outside diameter changes between those of the first and second portions, and a front-end-oriented end face is formed in the diameter transition region.