关键词: 重载电机, 轴承, 游隙, 同轴度

Abstract: In order to meet the requirements of force of the heavy-duty motor, the N-end bearing structure was upgraded. A deep groove ball bearing 6326 of the motor, which was not a transmission end, was optimized into a combination structure of a cylindrical roller bearing NU320 and a four-point contact ball bearing QJ318, in which the NU320 bearing bears radial force and the QJ318 bearing bears axial force. The mainly studies how to ensure the coaxiality of the two bearings at the non-transmission end of the motor and the QJ318 four-point contact ball bearing under certain axial pressure during the assembly of the three-bearing motor, so as to avoid the negative effects of temperature rise and vibration out of the outer ring deformation of the QJ318 bearing caused by  excessive coaxiality and axial pressure of the motor.

Key words: heavy-duty motor, bearing, clearance, coaxiality