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The factors must be considered when selecting bearings (1-2)

Various types of bearings have different characteristics due to different designs. Due to the variability and complexity of the specific mounting position of the bearing and the application, there is no fixed mode to choose the bearing type. In order to adapt to the specific installation position and application conditions of a certain host, when selecting the bearing type, it is recommended to consider the following major factors.

Allow Space

In mechanical design, the size of the shaft is generally determined first, and then the bearing is selected according to the size of the shaft. Generally, ball bearings are used for small shafts; cylindrical roller bearings, spherical roller bearings, and tapered roller bearings are used for large shafts (ball bearings may also be used sometimes). If the radial space of the bearing installation part is restricted, a bearing with a smaller radial section height should be used. Such as needle roller bearings, some series of deep groove ball bearings, angular contact ball bearings, cylindrical roller bearings, spherical roller bearings and thin-walled bearings. If the axial space of the bearing installation part is restricted, a bearing with a smaller width dimension can be used.

Bearing Load

Load size is usually the decisive factor in selecting bearing size. Roller bearings have greater carrying capacity than ball bearings with the same external dimensions. Usually ball bearings are suitable for light or medium loads, and roller bearings are suitable for heavy loads. For pure radial load, deep groove ball bearings and cylindrical roller bearings can be selected. For pure axial load, thrust ball bearings and thrust cylindrical roller bearings 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 are large shaft or housing deformation and poor installation centering at the same time, self-aligning ball bearings and spherical roller bearings can be selected. If the axial load is large and the radial load is small, thrust angular contact ball bearings and four-point contact ball bearings can be selected; if self-aligning performance is required, thrust spherical roller bearings can be selected.

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Post time: Apr-21-2021