Glow plug

Electric heating – Heating devices – Resistive element: igniter type

Reexamination Certificate

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Details

C313S141000

Reexamination Certificate

active

07420139

ABSTRACT:
An object is to provide a glow plug in which a gap can be prevented from being generated between a ceramic heater and a cylindrical member even at the time of use in an internal combustion engine, etc. so that electrical conduction of the glow plug can be prevented from being lowered. A glow plug includes: a rod-shaped ceramic heater2; a rod-shaped center pole5extending axially so as to electrically connect to the outside; and a cylindrical member100having a front end portion101bonded to an outer circumferential surface2aof a rear end side of the ceramic heater2, and a rear end portion102bonded to an outer circumferential surface of a front end side of the center pole5, the cylindrical member100being made by a metal material for electrically connecting one of a pair of lead portions and the center pole5to each other, the glow plug characterized in that the cylindrical member100has a Vickers hardness of not lower than 200 HV at 25° C.

REFERENCES:
patent: 6603244 (2003-08-01), Sugiyama et al.
patent: 6744188 (2004-06-01), Nishikawa et al.
patent: 6881930 (2005-04-01), Yoshikawa et al.
patent: 6979801 (2005-12-01), Okazaki et al.
patent: 7223942 (2007-05-01), Konishi et al.
patent: 7224256 (2007-05-01), Parsons
patent: 2002/0067110 (2002-06-01), Nishikawa et al.
patent: 2002/0158559 (2002-10-01), Sugiyama et al.
patent: 2004/0066124 (2004-04-01), Kanao et al.
patent: 9-42671 (1997-02-01), None
patent: 2002-13734 (2002-01-01), None
patent: 2002-174423 (2002-06-01), None
patent: 2002-364841 (2002-12-01), None

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