Patent ID: 9714661
Date: 2017-07-25
CPC Classifications: F04D

Claim:
1. A vacuum pump comprising: a rotating body having a rotation side exhaust function portion and a rotor shaft; a stationary side exhaust function portion; a lubricated ball bearing for supporting the rotor shaft; a motor for rotating and driving the rotating body; a first labyrinth seal provided between a space in which a motor stator of the motor is arranged and a space in which the lubricated ball bearing is arranged; a bearing holder for holding the lubricated ball bearing; and a balance adjustment member installed at a position on the rotor shaft to face the bearing holder and used for a balance adjustment of the rotating body, wherein a first concave and convex part forming the first labyrinth seal is formed on a surface of the balance adjustment member facing the bearing holder, and a second concave and convex part to be fitted to the first concave and convex part is formed on a surface of the bearing holder facing the balance adjustment member.