As the main parts of mechanical equipment, bearings play a key role in the operation process. Therefore, we attach great importance to the selection of rolling bearing types. Based on our understanding and experience of bearings, China bearing network tells you how to correctly find the most appropriate bearing type when selecting rolling bearing types, The type of rolling bearing can be selected through these elements.

Correctly select the type of rolling bearing and pay attention to these factors:

1. Load condition

The size, direction and nature of the load borne by the bearing are the main basis for selecting the bearing type. If the load is small and stable, the ball bearing can be selected; When the load is large and there is impact, roller bearings should be selected; If the bearing is only subject to radial load, select radial contact ball bearing or cylindrical roller bearing; Thrust bearing should be selected when only subjected to axial load; When the bearing is subjected to radial and axial loads at the same time, angular contact bearing shall be selected. The greater the axial load, the greater the contact angle should be selected. If necessary, the combined structure of radial bearing and thrust bearing can also be selected. It should be noted that thrust bearings cannot bear radial load and cylindrical roller bearings cannot bear axial load.

2. Speed of bearing

If the size and accuracy of the bearing are the same, the limit speed of the ball bearing is higher than that of the roller bearing. Therefore, when the speed is higher and the rotation accuracy requirements are higher, the ball bearing should be selected.

The limit speed of thrust bearing is low. When the working speed is high and the axial load is small, angular contact ball bearing or deep groove ball bearing can be used. For the bearing with high-speed rotation, in order to reduce the centrifugal force exerted by the rolling element on the outer race raceway, the bearing with smaller outer diameter and rolling element diameter should be selected. Generally, the bearing shall work under the condition of lower than the limit speed. If the working speed exceeds the limit speed of the bearing, the requirements can be met by improving the tolerance grade of the bearing and appropriately increasing its radial clearance.

3. Centering performance

The offset angle between the axes of the inner and outer rings of the bearing shall be controlled within the limit value, otherwise the additional load of the bearing will be increased and its service life will be reduced. For the shafting with poor stiffness or installation accuracy, the deviation angle between the axes of the inner and outer rings of the bearing is large, and the self-aligning bearing should be selected. Such as self-aligning ball bearing (Class 1), self-aligning roller bearing (Class 2), etc.

4. Allowed space

When the axial dimension is limited, narrow or extra narrow bearings should be selected. When the radial dimension is limited, the bearing with smaller rolling element should be selected. If the radial size is required to be small and the radial load is large, needle roller bearing can be selected.

5. Assembly and adjustment performance

The inner and outer rings of tapered roller bearing (Class 3) and cylindrical roller bearing (class n) can be separated, which is convenient for assembly and disassembly.

6. Economy

Under the condition of meeting the use requirements, the bearing with low price shall be selected as far as possible. Generally, the price of ball bearing is lower than that of roller bearing. The higher the accuracy grade of the bearing, the higher the price.

7. Other requirements

Among the bearings of the same size and accuracy, the price of deep groove ball bearing is the lowest.

The price ratio of deep groove ball bearings with the same model, size and different tolerance grades is about po: P6: P5: P4: P2 ≈ 1:1.5:2:7:10.

If there are no special requirements, ordinary precision bearings shall be selected as far as possible. Bearings with higher precision shall be selected only when there are higher requirements for rotation precision.

In addition, there may be various other requirements, such as the requirements for the overall design of the bearing device. Therefore, a comprehensive analysis and comparison should be made in the design to select the most suitable bearing.

Rolling bearing is also a kind of more precise mechanical component. There are many types of rolling bearings and a wide range of applications. However, we can select the most appropriate rolling bearing according to the specific conditions and requirements, so as to better improve the manufacturing performance of mechanical equipment.