Patent ID: 11933310
Assignee: EDWARDS JAPAN LIMITED
Field: Engines, pumps, turbines (Mechanical engineering)
Classification: CPC F | IPC F

Claim 0:
1. A vacuum pump comprising:
a casing having an inlet port or an outlet port;
a rotatable rotor shaft; and, a rotor coupled to the rotor shaft, wherein
a recess portion opened toward the inlet port is formed in the rotor;
a fastening portion of the rotor shaft is exposed to the recess portion; and
a cover portion which is fastened to the fastening portion by a fastening means and covers at least a part of the recess portion,
the cover portion being formed having a container shape and having:
a receiving portion comprising:
a ceiling surface opposed to and separated from an end surface of the fastening portion by a gap; and
a reinforcing portion protruding from the ceiling surface of the receiving portion such that the reinforcing portion is separate from a periphery of the fastening portion and the reinforcing portion decreasing deflection of the cover portion by increasing rigidity; and

a contact-pressure generating portion which is pressed by fastening to the fastening portion in a fastening direction and can cause a contact pressure to be generated in the fastening direction.