Bearing configuration. The shaft is supported by two bearings in the radial and axial direction, and one side is the fixed side bearing, which bears the radial and axial loads and acts as the relative axial movement between the fixed shaft and the bearing box. On the other side, the free side is only subjected to radial load, and the axial direction can be moved relatively, so as to solve the problem of shaft expansion caused by temperature change and the interval error of mounting bearing. On the shorter axis, there is no difference between the fixed side and the free side.

Select the fixed end bearing. Used to make the bearing axial positioning and fixing to bear the bidirectional axial load, the installation also needs to consider the corresponding strength according to the axial load size, generally selects the ball bearing as the fixed end, selects the free end bearing to avoid the shaft expansion caused by the temperature change during operation, and is used to adjust the axial position of the bearing, it is advisable to only bear the radial load and generally adopt the gap coordination between the outer ring and the shell. So that the shaft telescopic together with the bearing to do axial avoidance, sometimes also using the shaft and inner ring matching surface to do axial avoidance.

The cylindrical roller bearing is generally selected as the free end. Regardless of the fixed end and the free end, when the bearing spacing is small and the influence of shaft expansion is not great, the axial clearance after installation is adjusted with nuts or gaskets. Generally, two deep groove ball bearings or two centering roller bearings can be used as the support of the fixed end and the free end or without the fixed end and the free end.