(19)
(11) EP 1 441 126 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
29.09.2004 Bulletin 2004/40

(43) Date of publication A2:
28.07.2004 Bulletin 2004/31

(21) Application number: 04001344.3

(22) Date of filing: 22.01.2004
(51) International Patent Classification (IPC)7: F04C 2/18, F04C 11/00, F04C 15/04, F04C 15/00
(84) Designated Contracting States:
AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IT LI LU MC NL PT RO SE SI SK TR
Designated Extension States:
AL LT LV MK

(30) Priority: 24.01.2003 JP 2003016612
27.03.2003 JP 2003089245

(71) Applicant: Kabushiki Kaisha Toyota Jidoshokki
Kariya-shi, Aichi-ken (JP)

(72) Inventors:
  • Suzuki, Shigeru
    Kariya-shi, Aichi-ken (JP)
  • Fujii, Toshiro
    Kariya-shi, Aichi-ken (JP)

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

   


(54) Multistage gear pump


(57) A multistage gear pump for pressurizing fluid includes a housing, a drive shaft and a gear assembly. The drive shaft is rotatably supported in the housing. The gear assembly is disposed in the housing. The gear assembly includes at least first and second gear trains. Each train has a pair of drive and driven gears that are engaged with each other. The drive gear is provided on the drive shaft and followed by the driven gear. The first gear train and the second gear train are arranged so that fluid sequentially passes therethrough as the drive shaft rotates. A theoretical discharge capacity of the first gear train is larger than that of the second gear train.






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