Dry type vacuum pump e.g. spiral type vacuum pump, has rolling bearing interposed between rolling bearing support axle and axial wall of central housing of rotor shaft that is supported in rotation in main bearing

摘要

The pump has a rotor shaft (8) supported in rotation in a main bearing (12) associated with a stator (2) by a rolling bearing (13). A central housing (14) comprising an axial wall (16) and a radial wall (18) is arranged at an end (15) of the rotor shaft. The stator comprises a rolling bearing support axle (22) projected from the central housing. The rolling bearing is interposed between the rolling bearing support axle and the axial wall of the central housing of the rotor shaft, where the rolling bearing support axle is formed as a single piece with the stator.