The choice of bearing configuration knowledge - bearing

Usually, the shaft is two bearings in the radial and axial support, called bearing on one side of the fixed end bearing, it bear radial and axial load, the fixed axis and the relative axial displacement between the bearing box. To the other side is called the free end, only bear radial load, axial can move relatively. Fixed end bearing must be at the same time and the fixed shaft and bearing box, a suitable bearing is able to withstand radial composite load bearing, for example, deep groove ball bearing, spherical roller bearings, double row or diagonal contact ball bearing or tapered roller bearing. Bear the radial bearing combination of pure radial load, such as inside and outside the circle without a guard of cylindrical roller bearing and deep groove ball bearing, four-point contact ball bearing or two-way thrust bearing combination, also can be used as a fixed end bearing. At this point, the second bearing provide two-way axial positioning, but must keep bearing box when installing a radial interval. The free end bearing in shaft due to thermal expansion, the length changes, bearing inner extrusion will not occur. Axial displacement may occur within the bearing and also can produce bearing ring and bearing seat. 'Cross fixed' refers to such a bearing configuration, each bearing to the shaft of one-way positioning, and in the opposite direction. This combination is mainly used for short axis. All can bear at least one direction axial load with radial bearing, including deep groove and angular contact ball bearings, tapered roller bearings and NJ type cylindrical roller bearing, using angular contact ball bearing or tapered roller bearing, in some cases, must be exerted load.