GLOW PLUG FOR DIESEL ENGINE AND METHOD OF MANUFACTURING THE GLOW PLUG

摘要

A glow plug for diesel engine,wherein one end of a ceramic heater(2)is fixed to one end of a metallic outer tube(4)and the negative pole of the heater(2)is electrically connected to the metallic outer tube(4),the positive pole thereof is connected to an outer connection terminal(8)through an electrode extractor(6),the metallic outer tube(4)having the heater(2)and the outer connection terminal(8)therein are inserted into the internal hole(16)of a housing(10)and,after the tip of the heater(2)is positioned relative to the seat face(10a)of the housing(10),swading is performed from the outer peripheral side of the housing(10),an annular projected part(10d)is formed on the inner peripheral surface of the housing(10)and an annular recessed part(4c)fitted to the annular projected part(10d)is concurrently formed in the outer peripheral surface of the metallic outer tube(4),whereby the metallic outer tube(4)holding the heater(2)can be firmly fixed to the housing(10),and a cost can be reduced since a high accuracy is not requested for the inner diameter of the housing(10).