Title:
VACUUM PUMP AND VACUUM PUMP CONSTITUENT COMPONENT
Document Type and Number:
WIPO Patent Application WO/2020/241520
Kind Code:
A1
Abstract:
The present invention addresses the problem of providing a vacuum pump in which a gap due to fastening of a bolt is less likely to be caused. The vacuum pump is provided with: a body casing (14) including an intake opening (12a) or an exhaust opening (25); a rotor shaft (21) that can be rotated; and a rotor (28) coupled with the rotor shaft (21). The rotor (28) is formed with a recess (41) with an opening facing the intake opening (12a), wherein a fastening portion (a first axial portion (51) and a second axial portion (52)) of the rotor shaft (21) is exposed in the recess (41). The vacuum pump includes a cover portion (71) which is fastened to the fastening portion by means of a cover portion fixing bolt (86) and covers at least a part of the recess (41). The cover portion (71) is formed in the shape of a container and includes: a receiving portion (77) positioned around the fastening portion to increase stiffness and prevent warping; and an inserting portion (72) capable of generating a contact pressure in a fastening direction by being fastened to the fastening portion and thereby pressed in the fastening direction.
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Inventors:
OGAWA YOHEI (JP)
SAKAGUCHI YOSHIYUKI (JP)
YOSHIHARA NAHOKO (JP)
SAKAGUCHI YOSHIYUKI (JP)
YOSHIHARA NAHOKO (JP)
Application Number:
PCT/JP2020/020399
Publication Date:
December 03, 2020
Filing Date:
May 22, 2020
Export Citation:
Assignee:
EDWARDS JAPAN LTD (JP)
International Classes:
F04D19/04; F04D29/34
Domestic Patent References:
| WO2018174013A1 | 2018-09-27 |
Foreign References:
| JP2006194083A | 2006-07-27 | |||
| JP2018035684A | 2018-03-08 |
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