(19)
(11) EP 1 201 927 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
22.01.2003 Bulletin 2003/04

(43) Date of publication A2:
02.05.2002 Bulletin 2002/18

(21) Application number: 01124365.6

(22) Date of filing: 23.10.2001
(51) International Patent Classification (IPC)7: F04C 18/12, F04C 29/08
(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: 23.10.2000 JP 2000322577

(71) Applicant: Kabushiki Kaisha Toyota Jidoshokki
Kariya-shi, Aichi-ken 448-8671 (JP)

(72) Inventors:
  • Yamamoto, Shinya
    Kariya-shi, Aichi-ken 448-8671 (JP)
  • Hashimoto, Yuji
    Kariya-shi, Aichi-ken 448-8671 (JP)
  • Kawaguchi, Masahiro
    Kariya-shi, Aichi-ken 448-8671 (JP)
  • Shoji, Hitoshi
    Kariya-shi, Aichi-ken 448-8671 (JP)

(74) Representative: HOFFMANN - EITLE 
Patent- und Rechtsanwälte Arabellastrasse 4
81925 München
81925 München (DE)

   


(54) Vacuum pump


(57) A main body of a multi-stage Roots pump 11 is incorporated in a cover 47. A connecting flange 39, a muffler 40, a guide pipe 41 and a discharge pipe 42 constitute a discharge piping mechanism 64. The discharge pipe 42 incorporates a bellows 421. A connecting flange 58 and a suction pipe 59 constitute a suction piping mechanism 65. The suction pipe 59 incorporates a bellows 591. The bellows 421, 591 are incorporated in the cover 47.
Thus, loads generated when the bellows constituting part of the gas flow path of a vacuum pump are elastically deformed, by virtue of changes in internal pressures, are prevented from extending to auxiliary equipment.






Search report