| 摘要 |
The present invention provides a gas tight and simplified glow plug having a combustion pressure sensor. A plug main body 200 includes a cylindrical housing 201, mounted in an engine head 1 and has one end side positioned at a combustion chamber 1a side of the engine head 1, a cylindrical sheath tube 202, which is held in the housing 201 and has one end side exposed from the one end of the housing 201, a heating coil 203 received and held in the sheath tube 202, and a central shaft 204 acting as a rod-like electrode having one end side received in the sheath tube 202 and other end side exposed from other end of housing 201. An internal surface of the housing 201 and an external surface of the sheath tube 202 are secured together without forming a substantial gap between them by press fitting or the like. A combustion pressure sensor 300 is arranged around part of the central shaft 204, which protrudes from the housing 201, to measure a combustion pressure based on force acting on the sheath tube 202. <IMAGE> |
