Bearing type selection, these factors must be considered!
Bearing of different types have different characteristics. In order to adapt to the specific installation parts and working conditions of the machine, the selection of bearing type according to the following factors.
Allow space
The selection of bearings usually requires determining the size parameters of the shaft. For example, ball bearings are preferred for small axes; and roller bearings. Select the appropriate radial section bearing according to the radial space of the installation site.
Load properties
The nature of load can affect the choice of bearing type, such as deep groove ball bearing and cylindrical roller bearing, including thrust ball bearing and thrust cylindrical roller bearing. In the working condition of combined load, angular contact ball bearings or cone roller bearings are generally given priority;
magnitude of load
The load size usually directly affects the size of the bearing. Under the same shape size specification, the roller bearing capacity is larger than the ball bearing. Ball bearings are given priority to light or medium load and roller bearings for bearing heavy load.
working speed
The allowable running temperature of the rolling bearing will affect its working speed will be. High-speed operation occasions should choose bearings with low friction resistance and less heat. Generally, high precision angular contact ball bearings can be used for extremely high speed precision machine tools, and the working speed of thrust bearings will be lower than that of radial bearings.
running accuracy
Most of most machines, P0 is sufficient to meet; but for machine tool spindle, precision machinery and instruments, high precision bearings of P5, P4 or even P2 should be selected.
rigidity
The elastic deformation of rolling bearing may occur, which determines its rigidity, which is usually negligible, but in system applications such as machine tool spindle, bearing static and dynamic stiffness affect the system; usually the bearing rigidity can be appropriately improved by "pretightening"; the stiffness of roller bearing is usually higher than the ball bearing.
Noise and vibration
The bearings usually come from their own noise and vibration is very low. In the fields of small motor, electrical appliances and instruments, the noise and operation stability of equipment are high, need to choose silent bearings.
end travel
A set of bearings for axial positioning on one end of the shaft and the other end avoid the problem of thermal expansion and contraction of the shaft. Non-positioning bearings usually use cylindrical roller bearings without the inner or outer ring, and the inner ring matches the shaft or the outer ring and the shell hole.
friction moment
The friction resistance of ball bearings is usually smaller than that of roller bearings of the same size and specification. In the application of low friction torque, ball bearings or cylindrical roller bearings are generally selected. In addition, the sealing mode of bearing as far as possible, using oil lubrication, oil and gas lubrication and other wear reduction lubrication.
Allow space
The selection of bearings usually requires determining the size parameters of the shaft. For example, ball bearings are preferred for small axes; and roller bearings. Select the appropriate radial section bearing according to the radial space of the installation site.
Load properties
The nature of load can affect the choice of bearing type, such as deep groove ball bearing and cylindrical roller bearing, including thrust ball bearing and thrust cylindrical roller bearing. In the working condition of combined load, angular contact ball bearings or cone roller bearings are generally given priority;
magnitude of load
The load size usually directly affects the size of the bearing. Under the same shape size specification, the roller bearing capacity is larger than the ball bearing. Ball bearings are given priority to light or medium load and roller bearings for bearing heavy load.
working speed
The allowable running temperature of the rolling bearing will affect its working speed will be. High-speed operation occasions should choose bearings with low friction resistance and less heat. Generally, high precision angular contact ball bearings can be used for extremely high speed precision machine tools, and the working speed of thrust bearings will be lower than that of radial bearings.
running accuracy
Most of most machines, P0 is sufficient to meet; but for machine tool spindle, precision machinery and instruments, high precision bearings of P5, P4 or even P2 should be selected.
rigidity
The elastic deformation of rolling bearing may occur, which determines its rigidity, which is usually negligible, but in system applications such as machine tool spindle, bearing static and dynamic stiffness affect the system; usually the bearing rigidity can be appropriately improved by "pretightening"; the stiffness of roller bearing is usually higher than the ball bearing.
Noise and vibration
The bearings usually come from their own noise and vibration is very low. In the fields of small motor, electrical appliances and instruments, the noise and operation stability of equipment are high, need to choose silent bearings.
end travel
A set of bearings for axial positioning on one end of the shaft and the other end avoid the problem of thermal expansion and contraction of the shaft. Non-positioning bearings usually use cylindrical roller bearings without the inner or outer ring, and the inner ring matches the shaft or the outer ring and the shell hole.
friction moment
The friction resistance of ball bearings is usually smaller than that of roller bearings of the same size and specification. In the application of low friction torque, ball bearings or cylindrical roller bearings are generally selected. In addition, the sealing mode of bearing as far as possible, using oil lubrication, oil and gas lubrication and other wear reduction lubrication.
