Typically, a shaft with two bearing supports separated by a distance given. To accommodate the shaft and the housing thermal expansion effects in varying degrees, the installation should be a fixed bearing in the axial direction, the other bearing of the shaft can make swimming (i.e. swimming ring), to prevent elongation or contraction of the shaft caused by stuck. Walks support is usually chosen inner or outer wall of the cylindrical roller bearing (original 2000 model, 32000 type) and needle roller bearings, mainly the internal structure of these bearings allow the shaft and housing have proper axial displacement of the reason . In this case, the inner ring and the shaft, the outer ring and housing bore can be a tight fit. When using non-separable type bearings do support when swimming, such as deep groove ball bearings, spherical roller bearings, the installation must allow the outer ring and the housing bore, the inner ring and the shaft or a more loose fit, so that axially free-swimming.
Tapered roller bearings, spherical roller bearings and deep groove ball bearings are basically positioning type, when used as non-locating is used loosely fitted. All thrust roller bearings are positioned bearings.
Selection of bearing type, bearing installation and removal are convenient, but also must consider thoroughly, especially for large and extra large bearing installation and removal is particularly important. General outer separable angular contact ball bearings, tapered roller bearings, cylindrical roller bearings and needle roller bearings, installation and removal more convenient, their inner and outer rings respectively mounted on the shaft or housing bore. In addition, the inner diameter with a tapered bore with adapter sleeve Spherical roller bearings, double row cylindrical roller bearings and self-aligning ball bearings, but also relatively easy to install and remove.