(19)
(11) EP 1 167 746 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
10.12.2003 Bulletin 2003/50

(43) Date of publication A2:
02.01.2002 Bulletin 2002/01

(21) Application number: 01115087.7

(22) Date of filing: 21.06.2001
(51) International Patent Classification (IPC)7: F02M 47/02, F02M 47/04, F02M 47/06
(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: 22.06.2000 JP 2000187466

(71) Applicants:
  • Nippon Soken, Inc.
    Nishio-city, Aichi-pref. 445-0012 (JP)
  • TOYOTA JIDOSHA KABUSHIKI KAISHA
    Toyota-shi, Aichi 471-8571 (JP)

(72) Inventors:
  • Nishikori, Masataka
    Nishio-shi, Aichi-ken, 445-0012 (JP)
  • Takaki, Niro
    Kariya-shi, Aichi-ken, 448-0822 (JP)
  • Matsuoka, Hiroshi
    Kariya-shi, Aichi-Ken 448-0803 (JP)
  • Ohki, Hisashi
    Numazu-shi, Sizuoka-ken, 410-0822 (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 injection device


(57) A fuel injection device for internal combustion engines includes a needle valve (3) for opening and closing an injection port (33), a control chamber (5) for applying a fuel pressure to the needle valve (3) in a needle valve opening direction, a spring (13) for applying a biasing force to the needle valve (3) in a needle valve closing direction, a piezoelectric actuator (4) for increasing and decreasing a fuel pressure in the control chamber(5), a piston (2) which slides with the needle valve (3) so as to receive the fuel pressure in the control chamber (5) at a lower end face (2b) thereof, and a pressure storage chamber (11) for storing a fuel to be supplied to the injection port (33). The fuel injection device further includes another control chamber (6) which communicates with a fuel supply line (17) for applying a fuel pressure to an upper end face (2c) of the piston (2) in a needle valve closing direction. The another control chamber (6) communicates with the pressure storage chamber (11) via communication means (22).






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