A pressure measuring glow plug for a combustion engine

摘要

A piezo-resistive pressure-measuring plug (1) for a combustion engine for measuring a pressure is disclosed. The pressure-measuring plug comprises a plug body (2) and a sensing structure (4). The plug body comprises a threaded plug body part (2a) comprising an external thread for screwing the plug body into a cylinder of the combustion engine, a sealing plug body part (2b) forming a tip of the plug and configured for providing a seal between the plug body and the combustion engine. The plug body further comprises a sensing body part (2c) positioned between the threaded plug body part and the sealing plug body part. The sensing body part is made from one piece and comprises a cylindrical body part (2c1); a moving part (2c2) and the sensing structure. The sensing structure forms a connection between the cylindrical body part and the moving part and allows the moving part to move relatively to the cylindrical body part along a cylinder axis (6) of the cylindrical body part.