ATBECHDEDKESFRGBGRITLILUNLSEMCPTIESILTLVFIROMKCYALTRBGCZEEHU..SK................JDIM350 (Ver 2.1 Jan 2001) 1620000/01441126EUROPEAN PATENT APPLICATIONA320040929EP04001344.32004012220040122EnEnEn200301661220030124JP200308924520030327JP20040929200440200407282004317 7F 04C 2/18 A 7F 04C 11/00 B 7F 04C 15/04 B 7F 04C 15/00 BdeMehrstufige ZahnradpumpeenMultistage gear pumpfrPompe à engrenages multi-étagée1aKabushiki Kaisha Toyota Jidoshokki03405370EP40759Toyota Jidoshokki, Kabushiki Kaisha2-1, Toyoda-choKariya-shi, Aichi-kenJPSuzuki, Shigeruc/o K. K. Toyota Jidoshokki, 2-1 Toyoda-choKariya-shi, Aichi-kenJPFujii, Toshiroc/o K. K. Toyota Jidoshokki, 2-1 Toyoda-choKariya-shi, Aichi-kenJPLeson, Thomas Johannes Alois, Dipl.-Ing.00078982Tiedtke-Bühling-Kinne & Partner GbR, TBK-Patent, Bavariaring 480336 MünchenDEATBEBGCHCYCZDEDKEEESFIFRGBGRHUIEITLILUMCNLPTROSESISKTRALLTLVMK20040929200440

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.