Roller bearing is a kind of rolling bearing, and it is one of the parts widely used in modern machinery. It relies on the rolling contact between the main components to support the rotating parts. Roller bearings are now mostly standardized. Roller bearings have the advantages of small starting torque, high rotation accuracy, and convenient selection.
The roller bearing types are classified according to the types of rollers:
1. Cylindrical roller bearing: The rolling element is a cylindrical roller bearing, which is a radial thrust bearing (30000 type is mainly radial load, 3000B is mainly axial load). The outer ring can be separated, the clearance of the bearing can be adjusted during installation, and it is generally used in pairs, called double row cylindrical roller bearing.
2. Tapered roller bearing: The rolling element is a tapered roller bearing, which is a radial bearing. The outer ring (or inner ring) can be separated, so it cannot bear the axial load. The rollers are positioned axially by the ribs of the inner ring (or outer ring), and a small amount of axial misalignment of the inner and outer rings is allowed during operation. The allowable deflection of the inner and outer rings is small. This type of bearing can also have no inner ring or outer ring.
3. Needle roller bearings: the rolling elements are needle roller bearings, which are radial bearings. Under the same inner diameter condition, compared with other bearings of the same type, its outer diameter is the smallest, and the inner ring or outer ring can be separated. A slight axial misalignment of the inner and outer rings is allowed during work. The coefficient of friction is large.
4. Spherical roller bearing: the rolling element is a spherical roller bearing. Because the outer track table is a spherical surface centered on the bearing midpoint, it can be automatically adjusted. It is a radial bearing and allows the inclination of the inner ring to the outer ring axis ≤ 1.5°~2.5°.