Patent ID: 8399807
Filing Date: 2013-03-19
Classification: F23Q,Y10T

Abstract:
1. A glow plug, comprising: an axially extending cylindrical sheath tube including a closed front end; a coil made of a resistance wire having a taper-shaped reduced diameter portion formed at one end thereof, said coil disposed within said sheath tube and extending along the axis of the sheath tube with said taper-shaped reduced diameter portion joined to a front end of the sheath tube; a rod-like insulator made of an insulating material indisposed within the coil, said insulator having a general portion, a thin portion having a diameter smaller than an outer diameter of said general portion and a front end face, said thin portion formed on a front end side of the insulator, and being disposed within said taper-shaped reduced diameter portion of the coil, and insulating powder disposed within the sheath tube, said sheath tube being swaged along a portion of the axial length thereof, and said front end surface of the insulator being disposed at a position in the axial direction beyond where the swaging of said sheath tube occurred.