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Selection method of bearing structure and configuration
Aug 12, 2018

The type of machine is different, the conditions of use of the bearing will be different, and the performance requirements for the bearing will be different, but generally, no less than two bearings are used on one shaft.

Moreover, in order to facilitate axial orientation, one bearing is mostly used as a fixed end bearing while the rest is used as a free end bearing. The following table lists the choice of the bearing structure of the fixed end and free end.

The fixed end bearing is used for bearing axial positioning and fixation

Bearings which can bear both radial and axial loads are selected

To withstand bidirectional axial load, the installation also needs to consider the corresponding strength according to the size of axial load. Deep groove ball bearing combination Angle contact ball bearing

Double row angular contact ball bearing aligning ball bearing

Cylindrical roller bearing with baffle (NUP type, NH type)

Double row roller bearing aligning roller bearing

The free end bearing is used to avoid the expansion of the shaft caused by temperature changes during operation and to adjust the axial position of the bearing.

It is advisable to choose a bearing which can only bear radial load and the inner ring and the outer ring can be separated.

When using the non-separating bearing, the gap between the outer ring and the outer shell is usually used, so that when the shaft expands, it can be used with the bearing for axial protection. Used to avoid the expansion of the shaft caused by temperature changes during operation and to adjust the axial position of the bearing.

It is advisable to choose a bearing which can only bear radial load and the inner ring and the outer ring can be separated.

When using the non-separating bearing, the gap between the outer ring and the outer shell is usually used, so that when the shaft expands, it can be used with the bearing for axial protection.

When the bearing space is small and the bearing expansion has little effect on free end and fixed end, two angles of contact ball bearing or taper roller bearing which can bear the axial load shall be configured and used.

Adjust the axial clearance after mounting with a nut or spacer. Deep groove ball bearing Angle contact ball bearing

Aligning ball bearing cylindrical roller bearing

(NJ type, NF type)

Taper roller bearing center roller bearing

When used for vertical shaft, fixed end selects bearing which can bear both radial load and axial load at the same time. When the bearing of axial load is large, the thrust bearing and the centripetal bearing are used together.

The same free end can only bear the radial load bearing to avoid the expansion of the shaft. Fixed end

Combined angular contact ball bearing (back combination)

Double row tapered roller bearing (type 37000)

The thrust bearing and the centripetal bearing are combined

Generally, the shaft is supported by two bearings in the radial and axial directions. At this point, the bearing on one side is called the fixed side bearing, which bears the radial and axial loads and ACTS as the relative axial displacement between the fixed bearing and the bearing box. The other side is called the free side, which only bears the radial load, and the axial direction can move relatively, so as to solve the expansion part problem of the shaft and the interval error of mounting bearing caused by the temperature change.

For fixed side bearings, select bearings that can be moved either axially (such as cylindrical roller bearings) or by mounting surfaces (such as centripetal ball bearings). For shorter shafts, where there is little difference between the stationary side and the free side, use bearings (such as centripetal thrust ball bearings) that are only fixed axially.