(19)
(11) EP 1 184 563 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
19.11.2003 Bulletin 2003/47

(43) Date of publication A2:
06.03.2002 Bulletin 2002/10

(21) Application number: 01119222.6

(22) Date of filing: 09.08.2001
(51) International Patent Classification (IPC)7: F02M 47/02, F02M 45/12, F02M 59/46
(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: 30.08.2000 JP 2000260779

(71) Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHA
Toyota-shi, Aichi 471-8571 (JP)

(72) Inventors:
  • Omae, Kazuhiro, c/o Toyota Jidosha K.K.
    Toyota-shi, Aichi-ken, 471-8571 (JP)
  • Watanabe, Yoshimasa, c/o Toyota Jidosha K.K.
    Toyota-shi, Aichi-ken, 471-8571 (JP)

(74) Representative: Leson, Thomas Johannes Alois, Dipl.-Ing. 
Tiedtke-Bühling-Kinne & Partner GbR, TBK-Patent, Bavariaring 4
80336 München
80336 München (DE)

   


(54) Fuel injector


(57) A fuel injector (1) comprises a housing (2) with nozzles, a needle (3) movably accommodated in a needle accommodating chamber (5) formed in the housing, a fuel supply conduit (6) extending in the housing to the nozzles, a pressure control chamber (8) defined between the needle (3) and an inner wall of the needle accommodating chamber (5), a valve chamber (10) formed in the housing and connected to the pressure control chamber (8) via a communicating conduit, and a pressure control valve (14) accommodated in the valve chamber for controlling communication between the valve chamber and a relief conduit (12). When the pressure control valve (14) prevents communication between the valve chamber (10) and the relief conduit (12), fuel pressure in the pressure control chamber is increased and the needle is displaced in a first direction in which a volume of the pressure control chamber is increased and, when the pressure control valve connects the valve chamber and the relief conduit, a fuel pressure in the pressure control chamber drops and the needle is displaced in a second direction in which a volume of the pressure control chamber is reduced. The valve chamber is connected to the fuel supply conduit (6) via an inflowing conduit, so that fuel flows into the pressure control chamber from the fuel supply conduit through the valve chamber when the pressure control valve prevents communication between the valve chamber and the relief conduit.






Search report