Describes the fixing form of the bearing

1. Fix both ends

The short shaft (span <400mm) at ordinary operating temperature can be selected with the simpler one-way fixed form at both ends.The fixed supports at both ends are generally composed of angular contact ball bearings or tapered roller bearings arranged symmetrically. One of the rings of the bearing is adjusted axially during installation until a suitable clearance or the required preload is obtained.

2, one end fixed, one end swimming

When the shaft is long or the working temperature is high, due to the large amount of expansion, it is appropriate to choose the form of fixed one end and swimming one end to ensure the free expansion of the shaft. (It can eliminate the adverse effects and damage caused by thermal expansion and contraction.)Due to manufacturing errors, the distance between the center of the shaft supported by the two centripetal bearings and the center distance of the bearing seat are usually not exactly equal, and the increase in working temperature will also change this distance, so it is necessary to travel bearings to compensate for this error.Type N and NU cylindrical roller bearings are ideal for travelling bearings. The roller and cage of these bearings can be moved in the raceway within the bearing's unflanged ring. Other types of bearings can only be used as travelling bearings when one of the rings is loosely fitted, such as deep groove ball bearings and self-aligning roller bearings.

3. Swim at both ends

It is a very economical method to choose two ends of the floating support on the axis that does not require tight axial positioning.If the shaft is required to be left and right, the shafting structure with two ends can be used, such as a pair of herringbone gear shaft. Due to its own axial limiting effect, their bearing inner and outer rings and axial fixation should be designed to ensure that only one shaft has a fixed axial position relative to the frame, and the two bearings on the other shaft must be swimming to prevent the teeth from getting stuck or the force on both sides of the herringbone teeth is uneven. At this time, both ends of the bearing are not subject to axial force.

Deep groove ball bearings, self-aligning ball bearings and e spherical roller bearing are most suitable for travelling bearings. The fit of one of the two rings (usually the outer ring) of these bearings allows for axial movement. Tapered roller bearings and angular contact bearings are not suitable for rough qualification in swimming, because they must be adjusted to ensure that they can also turn normal.