公开(公告)号：US10253982B2

公开(公告)日：2019-04-09

申请号：US14579459

申请日：2014-12-22

Applicant: NGK Spark Plug Co., LTD.

Inventor： Hiroyuki Suzuki ,  Hiroki Tsuchiya ,  Akimitsu Sassa

IPC: F23Q7/00

Abstract: A glow plug includes a housing having an axial hole extending in an axial line direction; a ceramic heater that is relatively displaceable with respect to the housing along the axial line direction and has at least outer surface made of ceramic; and a pressure sensor fixed to the housing and configured to output a signal based on the relative displacement of the ceramic heater. A fixed member fixed to the ceramic heater while the ceramic heater is arranged to an inner circumference of the fixed member. A welded member is welded to an outer circumference of the fixed member. An inner circumferential surface of a portion of the fixed member to which at least the welded member is welded is spaced apart from the outer surface of the ceramic heater.