TWO-SHAFT VACUUM PUMP

摘要

The invention relates to a vacuum pump comprising two shafts (3, 4) and two rotors (1, 2) which co-operate with each other and which are fixed to the shafts. The rotors are cantilevered by means of the shafts. The invention aims to enable the rotors to be fixed to the shafts in a manner which is devoid of backlash, even during temperature changes. In order to achieve this, the shafts (3, 4) consist of a material having an elasticity module which is as high as possible, e.g. steel, the rotors (1, 2) consist of a material having a density which is as low as possible, e.g. aluminium or a titanium alloy, and means are provided to ensure that the rotors (1, 2) are fixed to the shafts (3, 4) in a manner which is devoid of backlash at all operating temperatures.