Patent ID: 6910850

Claim:
A vacuum pump comprising: a pump case having a gas suction port at an upper part of the pump case, a gas exhaust port at a lower part of the pump case, and a base; a stator column extending from the base of the pump case and having an outer circumferential surface; a rotor shaft rotatably supported in the pump case by the stator column; a rotor disposed around the outer circumferential surface of the stator column and integrally connected to the rotor shaft for rotation therewith; a driving motor disposed in the pump case for rotationally driving the rotor shaft; and a spacer removably integrally connected to the outer circumferential surface of the stator column, the spacer having an outer circumferential surface confronting an inner circumferential surface of the rotor and a radial cut extending from the outer circumferential surface to an inner circumferential surface thereof to define a pair of arm portions; and clamping means for clamping the arm portions of the spacer together to tighten and thereby removably integrally connect the spacer to the outer circumferential surface of the stator column.