Vacuum pump

Abstract

A vacuum pump, particularly a rotary vane pump with a high pumping capacity, has a pump chamber in a housing. A pump element is arranged in the pump chamber. The pump element is supported by a rotor shaft. The rotor shaft is connected to a belt pulley arranged outside of the pump housing. The pump also has a motor arranged outside of the pump housing. The drive shaft of the motor carries a drive pulley. The drive pulley is connected to the rotor pulley via a belt. To simplify assembly, the drive pulley and/or the rotor pulley are formed of multiple parts.

What is claimed is: 
     
         1 . A vacuum pump with a high pumping capacity, comprising
 a pump housing defining a pump chamber,   a pumping element connected with a rotor shaft,   a belt pulley connected with the rotor shaft outside the pump housing, and   a motor arranged outside the pump housing, the drive shaft thereof being provided with a drive pulley that is connected with the belt pulley via a belt,   wherein the drive pulley and/or the belt pulley are of a multipart structure.   
     
     
         2 . The vacuum pump of  claim 1 , wherein the drive pulley and/or the belt pulley are of a two-part design. 
     
     
         3 . The vacuum pump of  claim 1 , wherein the holding part of the drive pulley and/or the belt pulley comprise a shaft receiving means. 
     
     
         4 . The vacuum pump of  claim 3 , wherein the drive pulley and/or the belt pulley is connected with the drive shaft or the rotor shaft exclusively via the shaft receiving means of the holding part. 
     
     
         5 . The vacuum pump of  claim 1 , wherein the drive pulley and/or the belt pulley comprise a connecting part with a circular segment-shaped cross section. 
     
     
         6 . The vacuum pump of  claim 1 , wherein, for connection with each other, a connecting part and a holding part each comprise a connecting element which form a connecting web. 
     
     
         7 . The vacuum pump of  claim 6 , wherein the connecting web extends outside the shaft receiving means and is formed in particular in a manner corresponding to a secant of a circle. 
     
     
         8 . The vacuum pump of  claim 6 , wherein the connecting elements extend in parallel with each other and are preferably connected with each other by means of fixing elements. 
     
     
         9 . The vacuum pump of  claim 1 , wherein the belt is in the form of a flat belt. 
     
     
         10 . The vacuum pump of  claim 1 , wherein the belt is length-constant in operation.