Typically, the shaft by two bearings to support radial and axial, and this time, the side of the bearing is called fixed side bearing, it is both radial and axial load from the fixed shaft and bearing box The relative axial displacement effect. Called the free side of the other side, only the radial load, axial can be relatively mobile, this solution generated by temperature changes of the telescopic shaft bearing the Department of title and installing interval error. 
 For fixed-side bearing, rolling surface can be selected in the axial movement (such as cylindrical roller bearings) or by the assembly surface movement (such as radial ball bearings) bearings. In a relatively short shaft, fixed side and free side of the little other cases, the use of only one-way fixed axial movement of the bearing (such as ball bearing thrust to the heart)