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Bearing type selected is not good, don't say bearing quality bad - bearing knowledge

by:Waxing     2020-06-01
'Various types of bearings, due to the different design has different features. Due to the specific installation part of the bearing and applications of the complexity and variability, bearing type to choose has no fixed pattern to follow in order to adapt to a certain host specific installation site and application conditions of bearing type selection, proposal based on the following main factors taken into account. 'Allow space mechanical design, generally make sure of the size of the shaft, then choose according to the size of the shaft bearings. 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 installation position 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 bearing installation parts of axial space is restricted, can use the width of the smaller size of bearing. Load bearing load size load size is usually choose determinants of bearing size. Roller bearing than with the same shape size of the ball bearing capacity is big. Usually ball, roller bearing load in the bearing is suitable for light or apply to carry 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 ( Joint load) Angular contact ball bearing is generally selected, 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. As also there exists large shaft or shell deformation and installation of 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 requires a 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 bear radial load, the selection of deep groove ball bearings and cylindrical roller bearings can achieve high speed, if the joint under load, appropriate chooses angular contact ball bearings. The use of special design of high precision angular contact ball bearings, can achieve very high speed. The speed of the various kinds of thrust bearing are lower than the radial bearing. Rotation accuracy for the majority of machinery, choose a level 0 tolerance of bearing is enough to meet the requirements of the host, but on the axis of rotation accuracy have strict requirements, 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 its load bearing occurs when the elastic deformation to decide, in general, the deformation is small, negligible, but in some 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! Generally speaking, the roller bearing than ball bearings have high stiffness. All kinds of bearing by properly 'preload' can also improve the rigidity in different degrees. Bearing the noise and vibration noise and vibration is generally low. But for small and medium-sized motor, office machinery, household appliances and instrumentation, etc have special request for noise and running stability of machinery, usually choose low noise bearings. Axial movement of the bearing is the most common way of configuration at one end of the shaft installed a set of axial positioning 'bearing', and at the other end to install a set of axial movable bearing 'walk', in order to prevent 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 integral type deep groove ball bearings or spherical roller bearings for swimming bearings, but in the inner ring and the shaft or outer ring when installation should choose clearance fit together with the shell hole, to ensure that the inner ring or outer ring axial moving enough freedom. 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; Joint load, the bearing contact Angle and load Angle of similar angular contact bearing friction resistance is minimal. In equipment and machinery need low friction torque, using ball bearings or cylindrical roller bearing is suitable. Bearing WeChat professional! In addition, low friction torque bearings should avoid using contact seal, at the same time, the recommended oil drip lubrication, lubrication oil and gas or other beneficial to reduce friction lubrication method. Installation and disassembly with cylindrical inner hole of the bearing to install more frequently in the mechanical removal, should first choose separation type angular contact ball bearings, tapered roller bearings, separable cylindrical roller bearings, needle roller bearings, thrust bearing, etc. With conical inner hole of the bearing can be installed on the shaft neck, with tight sleeves or withdrawal suit on the cylindrical shaft neck, install the disassembly is very convenient.
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