Bearing selection didn't choose good, don't say bearing the quality of the poor

Each type bearing, due to the different design has different features. Bearing device in detail parts of the place and application of the complexity and variability, bearing type selection has no fixed form. To conform to a specific machine machine tool equipment parts and application conditions of stop bearing type selection, can according to the following main factors comprehensive thinking and selection of bearing. Allow space mechanical design, the size of the ordinary must first axis, and then according to the size of the shaft bearing choice. Usually, the small shaft choose ball bearing; Big shaft choose cylindrical roller bearing, spherical roller bearing, tapered roller bearings, Sometimes also can choose the ball bearing) 。 If the bearing assembly parts of the radial space is limited, should use smaller bearing radial section height. Such as needle roller bearing, some series of deep groove ball bearings, angular contact ball bearings, cylindrical roller bearing or spherical roller bearings and thin wall. If the bearing assembly parts of axial space is limited, can use the width of the smaller size of bearing. Load bearing load size load size is usually choose resolution factor of bearing size. Roller bearing than with the same shape size ball bearing load can be large. Usually ball bearing is suitable for the light or medium load, roller bearing is suitable for heavy load. Way to pure radial load can choose deep groove ball bearings, cylindrical roller bearings. Pure axial load can choose thrust ball bearings, thrust cylindrical roller bearings. A radial load and axial load ( Combining with the load) , the selection of angular contact ball bearing, or tapered roller bearing. If the larger radial load and axial load is small, bearing WeChat professional! Can choose deep groove ball bearings with inner and outer ring has a guard of cylindrical roller bearings. Seems to exist when the shaft or shell deformation of large and device on the status of the neutral difference, can choose self-aligning ball bearing, spherical roller bearings. If a large axial load and radial load is hours can choose thrust angular contact ball bearing, four-point contact ball bearing such as also asked self-aligning properties, can choose thrust spherical roller bearings. Speed rolling bearing working speed depends mainly on the permissible operating temperature. Low frictional resistance, internal heat less bearing is suitable for high-speed operation. Only accept a radial load, selection of deep groove ball bearings and cylindrical roller bearings can reach high speed, if to accept combined load, appropriate chooses angular contact ball bearings. The use of special design of high precision angular contact ball bearing, to reach the high rotational speed. The speed of the various kinds of thrust bearing are lower than the radial bearing. About most mechanical rotating precision, using level 0 tolerance of bearing is enough to satisfy the host requests, but has strict request to the axis of rotation accuracy, such as spindle, precision machinery and instrument etc. , should choose high tolerance grade of deep groove ball bearings, angular contact ball bearings, tapered roller bearings, cylindrical roller bearings and thrust angular contact ball bearings. Rigidity of the rolling bearing stiffness by the elastic deformation of its accept load attack to resolution, general conditions, the deformation is small, can neglect, but in some of the machinery, such as machine tool spindle system, static stiffness and dynamic stiffness of bearing a great influence on the characteristics of the system. Bearing WeChat professional! General speaking, roller bearing than ball bearings have high stiffness. All kinds of bearing after properly 'preload' also able to progress rigid different levels. Bearing noise and vibration is their common low noise and vibration. But the small and medium-sized motor, office machinery, household appliances and instrumentation to noise and running stability have special request such as machinery, usually choose low noise bearings. Axial moving bearing is the most common way of configuration at one end of the shaft device of a set of axial positioning 'bearing', and at the other end device to a set of axial bearing 'walk' to move, to avoid the result of the axial heat bilges cold shrink stuck phenomenon. Often use bearing 'walk' is no guard of cylindrical roller bearing inner ring or outer ring, at this time to cooperate or outer ring and inner ring on the shaft with the shell hole can use interference fit. Sometimes also can choose not separation type deep groove ball bearings or spherical roller bearings for floating bearing, but when the device or the outer ring and inner ring on the shaft housing holes with should choose clearance fit, to ensure that the inner ring or outer ring have sufficient axial move at ease. Friction torque of ball bearing friction roller bearing small, pure radial load is applied, the radial bearing small friction resistance; Pure axial load, axial bearing small friction resistance; Combined load is applied, the bearing contact Angle and load Angle of similar angular contact bearing friction is minimal. On the demand of low friction torque, instruments and machinery using ball bearings or cylindrical roller bearing is suitable. Bearing WeChat professional! In addition, low friction torque of bearings should be used to prevent contact seal, at the same time, the initiative with drops of oil is smooth, smooth or other oil and gas is conducive to smooth way of wearing. Device and remove with a cylindrical inner hole of bearing mechanical device used to remove more frequently, should first choose separation type angular contact ball bearings, tapered roller bearings, do not the cylindrical roller bearings, needle roller bearings, thrust bearing, etc. With conical bore bearing device on the neck, with tight sleeves or withdrawal suit on the cylindrical shaft neck, remove very bento device.