Clarify the model of Sendzimir bearing:

　　 Sendzimir bearing model indicates the basic size of the bearing, original clearance, cage type, sealing form, lubrication requirements, etc. Therefore, it must be clear whether the bearing model is correct before starting the installation.

Positioning of Sendzimir bearings:

　　In order to run smoothly, a shaft generally has at least two fulcrums for axial and radial support, and each fulcrum has at least one or more bearings. Under normal circumstances, one bearing plays a positioning role, while the other bearing does not. In special cases, both bearings play a role in positioning at the same time.

　　 positioning bearing provides radial support and axial guidance. Therefore, the positioning bearing must be fixed on the shaft and the bearing chamber at the same time. Deep groove ball bearings, spherical roller bearings, double row angular contact ball bearings, and pairs of single row angular contact ball bearings can all be used as positioning bearings. Paired tapered roller bearings can also be used. Cylindrical roller bearings without flanges can also be used as locating bearings when matched with thrust bearings with radial clearance.

　　Non-locating bearings only provide radial support, which must be movable in the axial direction. The axial movement can be generated by the bearing itself (for example, cylindrical roller bearings), or it can be the relative movement between the inner or outer ring of the bearing and its support.