Many different types of rolling bearings.

 1, according to the direction of load can be divided into radial bearings (radial force and small axial force), thrust bearing (only bear axial force) and radial thrust bearing (can withstand the radial and axial force).
       2, according to the shape of the rolling elements can be divided into ball bearings, roller bearings and needle roller bearings.
       3, according to the working conditions can be divided into plain bearings, high-speed bearings, high temperature bearings, bearing temperature, vacuum bearings, magnetic bearings, corrosion-resistant bearings, precision miniature bearings and oversize bearings. The various types of bearings into China B, C, D, E, G 5 个 accuracy level, B is the highest accuracy level, G is the general level of accuracy, the most common.
 Rolling is the standard, by special backing bearings factory mass production. Design choices are often factors to be considered life, load, precision, clearance (radial and axial), the limit speed, friction torque, aligning performance, preload and rigidity, vibration and noise.
 With the sliding bearing, bearing the advantages
       1, under normal conditions, the efficiency and hydrodynamic bearings lubricated bearings pretty, but more mixed lubricated bearings should be higher;
       2, the radial clearance is relatively small, radial angular contact bearings can be used preload preload to eliminate backlash, high running accuracy;
       3, for the same size shaft, Slewing bearing a width smaller than the sliding bearings, make the machine compact in the axial direction;
       4, most of the rolling bearing can be subject to both radial and axial loads, so bearing composite structure is simple;
       5, less lubricant consumption, easy to seal, easy to maintain;
       6, no useful for non-ferrous metals;
       7, the high degree of standardization, mass production and low cost.
 With the sliding bearing, bearing disadvantages:
       1, less able to withstand impact loads;
       2, high-speed heavy load bearing lower life;
       3, vibration and noisy;
       4, the radial dimension than the sliding bearings.