Patent ID: 7905209

Claim:
A glow plug with combustion pressure sensor comprising: a heating member adapted to be placed in one end of a plughole to raise a temperature of a combustion chamber; a cylindrical member fixedly secured to an outer circumferential wall of the heating member; a housing adapted to be fixedly secured to the plughole and holding an outer circumferential wall of the cylindrical member for an axial displacement capability; a diaphragm fixedly supported with the housing and the cylindrical member; a combustion pressure sensor mounted on the diaphragm and responsive to strain occurring in the diaphragm due to axial displacement of the cylindrical member for detecting a combustion pressure of the combustion chamber; a cover associated with the housing to define a closed air space to hermetically accommodate the combustion pressure sensor and having an insertion bore; and a lead wire fixedly connected to the cover and fixedly connected to the heating member to supply electric power thereto, the lead wire extends through the insertion bore and is hermetically bonded to an inner circumferential wall of the insertion bore, wherein a portion of the lead wire disposed within the cylindrical member has flexibility, whereby the lead wire can deflect within the cylindrical member to absorb an axial displacement of the heating member.