(19)
(11) EP 1 199 475 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
05.03.2003 Bulletin 2003/10

(43) Date of publication A2:
24.04.2002 Bulletin 2002/17

(21) Application number: 01124518.0

(22) Date of filing: 12.10.2001
(51) International Patent Classification (IPC)7: F04C 18/12, F04C 29/08, F04C 29/06
(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: 16.10.2000 JP 2000314967

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

(72) Inventors:
  • Yamamoto, Shinya
    Kariya-shi, Aichi-ken (JP)
  • Hashimoto, Yuji
    Kariya-shi, Aichi-ken (JP)
  • Shoji, Hitoshi
    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) Vacuum pump


(57) Passage structure for a vacuum pump has a flange, a muffler, a valve hole forming body, a guide pipe and an exhaust pipe. The flange is coupled to the muffler. The muffler is detachably fitted into the valve hole forming body. The valve hole forming body is detachably fitted into the guide pipe. The exhaust pipe is coupled to the guide pipe via the valve hole forming body. Each flange of the muffler, the valve hole forming body and the guide pipe is screw-on all together. A backflow preventing means is constituted of the guide pipe, the valve hole forming body, a valve body and a return spring. The guide pipe accommodates the valve body and the return spring therein. The valve body opens and closes a valve hole formed at the valve hole forming body. A separation preventing means is engaged with an inner circumferential surface of the guide pipe.






Search report