Selection of Tolerance Fits for Motor Components

Tolerance and fit is the motor product design and manufacturing process of the key, in order to ensure the stability of the quality of the motor operation process, many of the fit in accordance with the design of the interference fit, such as the motor bearings with the shaft of the fit, rotor core with the shaft and so on, choose the interference fit.

The interference fit relationship of the parts, relative to other fit relationship, both assembly and disassembly process is relatively difficult; such as, most of the small size motor bearings need to use cold press equipment to complete the assembly, while for large size motor bearings, more use of hot set of assembly. For the motor rotor core, if the cast aluminum rotor, is in the rotor core of the hot state to complete the assembly, is also the hot set way.

When the surplus with the parts need to dismantle, it is very difficult to pull down the bearings from the shaft, need to use a special dismantling tool, and, in the dismantling process, is likely to lead to the shaft with the surface of the dimensional changes that occur in some motors after repeated replacement of bearings, there will be bearings with the shaft with the problem of loosening, and in severe cases, the problem of running the inner ring. For cast aluminum rotor motor, to take down the rotor core from the shaft, is also a very difficult thing, if you want to repair the shaft or rotor core, dismantling of the early stage of the difficulty is very large for the larger specifications of the motor, may need to use hydraulic equipment can be completed. For this reason, the quality and reliability of such parts is essential; and for the wear and tear problem is difficult to avoid, the repair unit has come up with some necessary remedial measures, but how to ensure that the performance of the parts required, is a must control key.