(19)
(11) EP 0 902 236 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
11.10.2000 Bulletin 2000/41

(43) Date of publication A2:
17.03.1999 Bulletin 1999/11

(21) Application number: 98117067.3

(22) Date of filing: 09.09.1998
(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
Designated Extension States:
AL LT LV MK RO SI

(30) Priority: 20.08.1998 JP 23336298
11.09.1997 JP 26791797

(71) Applicant: Denso Corporation
Kariya-city, Aichi-pref., 448-0029 (JP)

(72) Inventor:
  • Takeshima, Keiichi
    Kariya-city, Aichi-pref. 448-0029 (JP)

(74) Representative: Pellmann, Hans-Bernd, Dipl.-Ing. et al
Patentanwaltsbüro Tiedtke-Bühling-Kinne & Partner Bavariaring 4-6
80336 München
80336 München (DE)

   


(54) Glow plug


(57) A glow plug used in diesel engines is provided which includes a plug housing, a heater casing, and a heating element. The heating element consists of a heating coil and a current-controlling coil connected in series with the heating coil to control the current flowing to the heating coil. The heater casing has disposed therein the heating coil and the current-controlling coil and is inserted partially into the housing from an open end thereof. The heater casing includes a small-diameter portion and a large-diameter portion connected in series with the small-diameter portion. The whole of the large-diameter portion is disposed within the housing in tight engagement therewith, while the whole of the small-diameter portion projects from the open end of the housing for producing a clearance with an inner wall of a glow plug mount hole formed in an engine head to minimize the heat transfer from the heating element to the engine head.






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