There are many kinds, types and sizes of rolling bearings. In order to make the mechanical device play the expected performance, it is very important to select the most suitable bearing. In order to select bearings, many important reasons need to be analyzed：

1. Bearing load

Load size Load size is usually the determining factor in the selection of bearing size. Roller bearings have greater bearing capacity than ball bearings with the same dimensions. Usually ball bearings are suitable for light or medium loads, roller bearings are suitable for bearing heavy loads.

Pure radial load can use deep groove ball bearings, cylindrical roller bearings. Pure axial load can choose thrust ball bearing, thrust cylindrical roller bearing. When there is radial load and axial load (combined load), angular contact ball bearings or tapered roller bearings are generally used. If the radial load is large and the axial load is small, deep groove ball bearings and cylindrical roller bearings with inner and outer rings can be selected. If there is also large deformation of shaft or shell and poor installation of neutral, self-aligning ball bearings and self-aligning roller bearings can be selected. If the axial load is large and the radial load is small, thrust angular contact ball bearings can be selected. If the self-aligning performance of four-point contact ball bearings is also required, thrust self-aligning roller bearings can be selected.

2. Rotation accuracy

For the majority of machinery, choose a level 0 tolerance of bearing is enough to meet the requirements of the host, but on the axis of rotation accuracy have strict requirements, such as spindle, precision machinery and instrument etc., should choose high tolerance grade of deep groove ball bearings, angular contact ball bearings, tapered roller bearings, cylindrical roller bearings and thrust angular contact ball bearings.

3. Noise and vibration

The noise and vibration of the bearing itself are generally very low. But for small and medium-sized motors, office machinery, household appliances and instruments, which have special requirements on noise and running stability, low-noise bearings are usually selected.

4. The rigid

The rigidity of a rolling bearing is determined by the amount of elastic deformation that occurs when it is under load. In general, such deformation is small and can be ignored, but in some machinery, such as machine tool spindle system, the static stiffness and dynamic stiffness of the bearing have a great influence on the characteristics of the system. Roller bearings have higher stiffness than ball bearings. Various types of bearings can also improve rigidity to varying degrees by properly “pretightening”.

5. Speed

The working speed of rolling bearings mainly depends on its allowable operating temperature. Bearings with low friction resistance and less internal heat are suitable for high-speed operation. When only bearing radial load, using deep groove ball bearings and cylindrical roller bearings can achieve higher speed, if bearing combined load, should choose angular contact ball bearings. Specially designed high-precision angular contact ball bearings can achieve extremely high speed. The speed of all kinds of thrust bearings is lower than that of radial bearings.

e-mail：bearing6@hyzcgroup.com