(19)
(11) EP 1 308 672 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
30.08.2006 Bulletin 2006/35

(43) Date of publication A2:
07.05.2003 Bulletin 2003/19

(21) Application number: 02017728.3

(22) Date of filing: 08.08.2002
(51) International Patent Classification (IPC): 
F23Q 7/00(2006.01)
(84) Designated Contracting States:
AT BE BG CH CY CZ DE DK EE ES FI FR GB GR IE IT LI LU MC NL PT SE SK TR
Designated Extension States:
AL LT LV MK RO SI

(30) Priority: 01.11.2001 JP 2001336796

(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)
  • Miura, Toshitsugu, Bosch Automotive Systems Corp.
    Higashimatsuyama-shi, Saitama-ken (JP)
  • Zhao, Jian, Bosch Automotive Systems Corp.
    Higashimatsuyama-shi, Saitama-ken (JP)
  • Sekiguchi,Osamu, Bosch Automotive Systems Corp.
    Higashimatsuyama-shi, Saitama-ken (JP)

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

   


(54) Glow plug for diesel engine and method of manufacturing same


(57) A sufficient area is secured for a seat area 26 which is to be disposed in abutment against a cylinder head when the external diameter of a housing 20 (a fixture for mounting a glow plug on a cylinder head) is reduced while maintaining the internal diameter unchanged. A press fit region 24b is defined in an internal bore 24 of a housing 20 toward the distal end 20a, and a rear portion of a sheath 12 to which a ceramics heater 2 is secured is disposed as a press fit in the press fit region 24b to be secured therein. The sheath 12 has a portion 12b of an increased diameter which is inserted into the housing 20 and a portion 12a of a reduced diameter in which the ceramics heater 2 is contained and which projects externally. The internal bore 24 of the housing 20 has an opening 24e which is of a smaller diameter than the press fit region 24b, increasing the radial breadth of the seat area 26 formed on the front end face of the housing 20.







Search report