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Correctly grasping the use position of the spherical roller bearing in the mechanical device, the conditions of use and the environmental conditions are the prerequisites for selecting a suitable spherical roller bearing. For this purpose, the following data and information are required:
(1) The function and structure of the mechanical device
(2) Use parts of spherical roller bearings
(3) Spherical roller bearing load (size, direction)
(4) Rotation speed
(5) Vibration and shock
(6) Spherical roller bearing temperature (ambient temperature, temperature rise)
(7) Ambient atmosphere (corrosive, clean, lubricating)
Rigidity of spherical roller bearings
The rigidity of a spherical roller bearing is determined by the amount of elastic deformation that occurs when it is under load. In general, this amount of deformation is small and can be ignored, but in some machinery, such as machine tool spindle systems, the spherical roller The static stiffness and dynamic stiffness of the sub-bearings have a great influence on the characteristics of the system. Spherical roller bearings have higher stiffness than ball bearings. Various types of bearings can also improve the rigidity to varying degrees by properly "preloading".
Spherical roller bearings suitable for heavy loads
The magnitude of the load The magnitude of the load is often the determining factor in the selection of bearing size. Roller bearings have a higher load carrying capacity than ball bearings with the same external dimensions. Generally, ball bearings are suitable for light or medium loads, and roller bearings are suitable for heavy loads.
Load mode Pure radial load can choose deep groove ball bearing and cylindrical roller bearing. For pure axial load, thrust ball bearing and thrust cylindrical roller bearing can be selected. 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 ribs on the inner and outer rings can be selected. If there is also large deformation of the shaft or housing and poor installation alignment, self-aligning ball bearings and self-aligning roller bearings can be selected. If the axial load is large and the radial load is small, the thrust angular contact ball bearing can be selected. If the four-point contact ball bearing also requires self-aligning performance, the thrust spherical roller bearing can be selected.
2021-03-11