Under normal working conditions, you can get the proper working clearance by choosing ordinary group clearance bearings. To make the bearing have a more ideal axial positioning is a necessary condition for the good operation of the bearing.How to control the radial clearance of the bearing Bearing internal clearance refers to the total distance that one bearing ring can move in the radial or axial direction relative to the other bearing ring. From the analysis of the operating characteristics of the bearing, to fully achieve the bearing capacity of the bearing used, the entire circumference of the inner and outer rings of the bearing, or the shaft washer and seat ring of the thrust bearing, must be fully supported by solid and uniform support. However, when the working and installation conditions are different from the general situation, such as the inner ring and outer ring of the bearing are interference fit, or the temperature difference between the inner ring and the outer ring is greatly affected, the clearance should be selected compared with the ordinary group. Bearing radial positioning and control points In the actual bearing selection process, some motor manufacturers are accustomed to selecting bearings that carry a large load, but bearing noise problems often occur, especially in some motors, the bearing noise is louder during no-load operation, but running with load The sound at the time is particularly good. If the bearing ring is not properly or adequately fixed, it is easy to cause damage to the bearing and related components. Large or small bearings. The supporting surface can be a cylindrical or conical surface, and a flat surface is used for the shaft washer and seat washer of the thrust bearing. To In order to make the motor bearings run well, the radial clearance is very important. The general principle of bearing operation is that the working clearance of ball bearings should be zero or slightly preloaded; but for cylindrical roller bearings, a certain residual clearance must be left during operation. This problem may be related to the improper selection of the bearing. It is necessary to select suitable bearings to match them according to the actual characteristics and operating conditions of the motor. In addition, the bearing ring must be securely fixed to prevent the bearing ring from rotating between its mating surfaces under load. Therefore, the machining of the mating surface with the bearing ring must reach a certain accuracy, and there should be no grooves, holes or other discontinuous shapes. Generally speaking, there must be a proper amount of interference so that the bearing ring can be fixed Mechanical roller bearings in the radial direction and be adequately supported. For the bearing clearance, it is necessary to distinguish the initial clearance before installation and the working clearance after installation and reach its operating temperature. But sometimes in order to facilitate installation and disassembly, or the bearing needs to have the function of axial movement because it is used on the floating end, interference fit cannot be used. The initial clearance of the bearing is generally larger than the working clearance, which is due to the tolerance fit of different interference and the different degree of thermal expansion of the bearing ring and its adjacent parts, which causes the ring to expand or compress. In some cases where clearance fits are used, some special measures need to be taken to reduce the wear caused by creep, such as: the mating surfaces and shoulders of surface-hardened bearings, and special lubrication grooves to lubricate the mating surfaces and eliminate wear particles , Or use the positioning key groove on the side of the bearing to fix the bearing.
