Bearings are usually divided into two categories according to their purposes:
1.General bearing: It is divided according to structure or size.
2. Special bearing: It is divided according to the occasion where the bearing is used. The following will introduce several special bearings:
(1) Rolling mill bearings
Rolling mills can be divided into two-roll mills, four-roll mills, six-roll mills, and 20-roll mills. Roll bearing refers to the bearing installed on the journals at both ends of the work roll and backup roll. The roller bearings have to bear a large radial rolling force, and the radial space for installing the roller bearings is limited. Therefore, the rollers use multi-row roller bearings to withstand large radial forces, and sometimes use angular contact ball bearings. Or thrust bearing to bear the axial force. Mainly use four-row tapered roller bearings, four-row cylindrical roller bearings and spherical roller bearings
(2) Motor bearings
Motors are widely used in various mechanical equipment, and the quality of the motor is related to the running smoothness of the bearings used to a certain extent. It requires bearings with low noise, economy and simple support structure, usually deep groove ball bearings.
(3) Machine tool bearings
The machine tool bearing is the main part of the machine tool, and its working performance directly affects the quality and production efficiency of the workpiece. Generally, deep groove ball bearings, angular contact ball bearings, tapered hole double row cylindrical roller bearings, tapered roller bearings, thrust ball bearings, thrust roller bearings and two-way thrust angular contact ball bearings are generally used.
