(19)
(11) EP 1 207 349 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
06.04.2005 Bulletin 2005/14

(43) Date of publication A2:
22.05.2002 Bulletin 2002/21

(21) Application number: 01126433.0

(22) Date of filing: 08.11.2001
(51) International Patent Classification (IPC)7: F23Q 7/00
(84) Designated Contracting States:
AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE TR
Designated Extension States:
AL LT LV MK RO SI

(30) Priority: 13.11.2000 JP 2000345654
03.08.2001 JP 2001236926

(71) Applicant: Bosch Automotive Systems Corporation
Tokyo (JP)

(72) Inventors:
  • Tanaka, Arihito, Bosch Automotive Systems Corp.
    Higashimatsuyama-shi, Saitama-ken (JP)
  • Aota, Takashi, Bosch Automotive Systems Corp.
    Higashimatsuyama-shi, Saitama-ken (JP)
  • Zhao, Jian, Bosch Automotive Systems Corp.
    Higashimatsuyama-shi, Saitama-ken (JP)
  • Miura, Toshitsugu, Bosch Automotive Systems Corp.
    Higashimatsuyama-shi, Saitama-ken (JP)

(74) Representative: HOFFMANN - EITLE 
Patent- und Rechtsanwälte Arabellastrasse 4
81925 München
81925 München (DE)

   


(54) Ceramics glow plug and method of manufacturing same


(57) Toward an end 6d of a ceramics heater 6, a coiled heating element 64 formed of a high melting point metal and a control coil 13 having a greater positive temperature coefficient of resistance than the heating element 64 are connected together through a lead wire 11, and the other end 13b of the control coil is connected to an electrode fitting 12. The ceramics heater 6 is cemented within a reduced diameter portion 8f of a metallic outer sleeve 8 by brazing while the control coil 13 and its junction 12a, 13b with the electrode fitting 12 are contained within an increased diameter portion 8g of the metallic outer sleeve 8. A heat resistant insulating powder 14 is filled into a space 15 located within the increased diameter portion 8g of the metallic outer sleeve 8, a seal member 16 is fitted into an opening 4d, and an end 8e is caulked before applying a swaging operation to the metallic outer sleeve. Subsequently, the electrode fitting 12 is welded to an external connection terminal 18, and a resulting assembly is assembled into a housing 2. An ease of assembly of a self-controlled ceramics glow plug 1 is improved while allowing a reduction in the cost.






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