(19)
(11) EP 1 344 942 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
15.09.2004 Bulletin 2004/38

(43) Date of publication A2:
17.09.2003 Bulletin 2003/38

(21) Application number: 03005714.5

(22) Date of filing: 13.03.2003
(51) International Patent Classification (IPC)7: F04D 29/04, F04D 29/02
(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: 13.03.2002 JP 2002069357

(71) Applicant: Minebea Co. Ltd.
Kitasaku-gun, Nagano 389-0293 (JP)

(72) Inventors:
  • Hokkirigawa, Kazuo, c/o Minebea Co. Ltd.
    Kitasaku-Gun, Nagano-Ken, 389-0293 (JP)
  • Akiyama, Motoharu, c/o Minebea Co. Ltd.
    Kitasaku-Gun, Nagano-Ken, 389-0293 (JP)

(74) Representative: Wilson Gunn Gee 
Chancery House, Chancery Lane
London WC2A 1QU
London WC2A 1QU (GB)

   


(54) Electrically motorized pump for use in water


(57) An electrically motorized pump with a low energy loss owing to its use of a shaft and sleeve made from synthetic resin composition obtained by uniformly dispersing fine powder of RBC or CRBC in a resin. The typical process for the production of a synthetic resin composition for making the sleeve bearing for the pump for use in water includes kneading with a resin the fine powder of RBC or CRBC at a temperature in the neighbourhood of the melting point of the resin, and thereby uniformly dispersing the fine powder of RBC or CRBC in the resin.






Search report