Rotor attachment for compressor

Abstract

A compressor having drive assembly including a crankshaft and a motor having a stator and a rotor. The rotor is received on a crankshaft and secured to the crankshaft via a counterweight. In one exemplary embodiment, the counterweight is shrink-fit or press-fit in position on the crankshaft and the rotor is attached to the counterweight. In one exemplary embodiment, the rotor may be secured to the counterweight by fasteners, such as bolts. The interference between the counterweight and the crankshaft is sufficiently strong to transfer driving loads from the rotor and through the counterweight to drive the crankshaft. In one exemplary embodiment, the rotor includes a central opening having a diameter larger than the diameter of the crankshaft. This allows for the rotor to fit closely to the crankshaft without touching the same. As a result, the rotor may be easily assembled as a slip-fit on the crankshafts and then secured to the counterweights.

1 . A drive assembly in a compressor, the drive assembly comprising:
 a motor having a stator and a rotor;   a crankshaft connected to a compression mechanism; and   a counterweight secured to said crankshaft, said counterweight rotatably fixed to said rotor, wherein said rotor is rotatably secured to said crankshaft solely by said counterweight.   
     
     
         2 . The drive assembly of  claim 1 , wherein said counterweight is secured to said crankshaft by one of a shrink-fit and a press-fit. 
     
     
         3 . The drive assembly of  claim 2  wherein said rotor is secured to said counterweight by means of at least one fastener. 
     
     
         4 . The drive assembly of  claim 3  wherein said fastener is a bolt. 
     
     
         5 . The drive assembly of  claim 1  wherein said rotor is secured to said counterweight by means of at least one fastener. 
     
     
         6 . The drive assembly of  claim 5  wherein said rotor is secured to said counterweight by means of at least one fastener.