Patent ID: 6098273
Filing Date: 2000-08-08
Classification: F04B,F16D,H02K,Y10T

Abstract:
A device for mounting a shaft to a rotor of an electric motor, said shaft having, at its upper part, an annular flange portion, which is seatable on a bearing portion of a cylinder block, the rotor being attachable around said shaft comprising:a hermetic chamber having an atmosphere which is inert to a pressure higher than the atmospheric pressure;a primary feeding station which is provided inside the hermetic chamber, which contains liquefied cryogenic gas and which receives a plurality of shafts to be refrigerated and immersed in said liquefied gas;a mounting station provided inside the hermetic chamber;a secondary feeding station which stores cylinder blocks and rotors to be conducted to the mounting station;a carrying means which takes from the primary feeding station each shaft already diametrically contracted by refrigeration and which introduces said shaft through a bearing bore of the cylinder block into the central bore of the rotor, said cylinder block and rotor parts being previously positioned at the mounting station, until a mounting position in said rotor has been achieved, without interfering with the walls of said bores, the displacement of the contracted shaft towards the mounting station occurring during a time interval insufficient for the contracted diameter of shaft to achieve, by dilatation, a value which is higher than a maximum mounting diameter which is lower than the diameter of the central bore of the rotor.