VACUUM PUMP WITH TWO CO-OPERATING ROTORS

摘要

The invention relates to a vacuum pump (1) comprising a pump expansion chamber (5) accommodating two co-operating rotors (2,3) which are respectively arranged on a shaft (8, 9); a mounting/ gear chamber (6) adjacent to the pump expansion chamber (5), wherein the rotor shafts (8, 9) are floatingly mounted and provided with a synchronization gear (17); a drive motor (25) whose drive shaft (28) extends parallel to the rotor shafts (8, 9) and is provided with a drive gear (35); also comprising a gear stage (37) between the drive shaft (28) and one of the rotor shafts (8, 9). In order to provide a machine of this type which can be embodied in a compact form, the drive gear (35) of the drive shaft (28) engages directly with a driven gear (36) on one of the rotor shafts (8, 9), forming the gear stage (37).