Bearing type selection considerations

When selecting the bearing type, it is important to fully understand the conditions of use of the bearing. The following table lists the main analysis items: Analysis Project Selection Method


1) Bearing installation space Bearing type that can be accommodated in the bearing installation space Since the rigidity and strength of the shaft are important when designing the shaft system, the shaft diameter, that is, the inner diameter of the bearing, is generally determined first.

However, rolling bearings are available in a variety of sizes and types, and the most suitable bearing type should be selected.

2) The size, direction and nature of the load bearing load [The bearing capacity of the bearing is expressed by the basic rated load, and its value is shown in the bearing size table] The bearing load is rich, such as the magnitude of the load, whether there is only radial load, axial load Whether it is one-way or two-way, the degree of vibration or shock, and so on. After considering these factors, choose the most suitable bearing type.

In general, the radial load capacity of bearings of the same inner diameter is increased in the following order: deep groove ball bearings < angular contact ball bearings < cylindrical roller bearings < tapered roller bearings < spherical roller bearings

3) The bearing type whose speed can adapt to the mechanical speed [the limit value of the bearing speed is expressed by the limit speed, and its value is shown in the bearing size table] The limit speed of the bearing is not only determined by the bearing type but also the bearing size, cage type, and accuracy grade. , load conditions and lubrication methods, etc., therefore, these factors must be considered when selecting.

Most of the following bearings are used for high speed rotation:

Deep groove ball bearings, angular contact ball bearings, cylindrical roller bearings

4) Rotational accuracy Bearing type with required rotation accuracy [The dimensional accuracy and rotation accuracy of bearings have been standardized by GB according to bearing type]? Machine spindles, gas turbines and control machines require high rotational accuracy, high speed and low friction, respectively. Bearings with a precision of 5 or more should be used at this time.

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