Selection of bearing type, fully grasp the bearing conditions of use is crucial. Analysis of the project mainly are listed in the following table: selection method
1) the installation space of rolling bearings can accommodate to the bearing installing NSK bearings type space due to the design of shafting by focusing on the axial rigidity and strength, so the general first determine the shaft diameter, the inner diameter of the bearing. But in a variety of sizes and types of rolling bearings, should choose the most appropriate type of bearing.
2) load capacity load bearing load magnitude, direction and nature [bearing with basic load ratings, its value is contained in table bearing size bearing load variations, such as whether the size of the load, only the radial load, axial load is a one-way or two-way, vibration or impact degree etc.. After considering these factors, and then to select the most appropriate type of bearing. In general, the radial load bearing capacity of the same diameter increment in the following order: deep groove ball bearings, angular contact ball bearings < < cylindrical roller bearings, self-aligning roller bearing tapered roller bearing < <
3) speed can meet the mechanical speed rolling bearing type bearing speed limit standard limit speed, speed limit values contained in table bearing size] bearing not only depends on the type of bearing is limited to the size of bearing, cage type, precision grade, load condition and lubrication way, therefore, when the choice must be consider these factors. The following bearings are mostly used in high speed rotation: deep groove ball bearings, angular contact ball bearings, cylindrical roller bearings
4) size and rotation precision accuracy of rotation has the required rotation precision rolling bearings bearing has been GB according to the type of bearing standardized] machine tool spindle, gas turbines and control machines respectively high rotation accuracy, high speed and low friction, then should use bearing precision grade 5 above. The general use of the following: deep groove ball bearings, bearing contact ball bearing, cylindrical roller bearing
5) rigidity needed to satisfy the mechanical shaft rigid bearing type bearing load, roller and raceway contact part can generate elastic deformation. "High rigidity" refers to the elastic deformation smaller] reduction device and other parts of the machine tool spindle and motor stage, to improve the rigidity of shaft at the same time, must also increase the rigidity of the bearing. Roller bearing ball bearing small deformation load than the. The bearing applied preload (negative clearance) can improve rigidity. This method is suitable for ball bearings and tapered roller bearings in angular contact.
6) the inner and outer rings tilted relative to the inner ring and outer ring of bearing factors relative to the inclination (such as deflection, load caused by the shaft and housing poor accuracy or installation error), and the selection of bearing types can adapt to the conditions of use of the. If the inner and outer rings relative tilt is too large, bearing damage due to an internal load. So we should choose bearings can withstand this tilt type. In general, allow the tilt angle (or angle) increment in the following order: cylindrical roller bearings, tapered roller bearings, deep groove ball bearings (angular contact ball bearing), spherical roller bearings (ball)
7) installation and dismantling of regular inspection, assembly and disassembly method of assembly and disassembly frequently, cylindrical roller bearing inner ring and the outer ring can be separated using the tapered roller bearings, needle roller bearings and more convenient. Self-aligning ball bearings with tapered bore and a conical hole self-aligning roller bearing by using fasteners or withdrawal sleeve can be easy to dismantle. Types of selected mechanical bearing structure is not the same, there will be a different bearing conditions of use, its performance requirements are not the same, but generally speaking, bearing a shaft of not less than two. Moreover, in order to facilitate axial positioning, using mostly a bearing a fixed end bearing, the other is used as a free end bearing. The following table lists the fixed end and free end bearing structure selection. Bearing type fixed end bearing suitable for bearing so that the bearing axial positioning and fixing the can bear radial and axial load to bear two-way axial load, installation also need according to the size of the corresponding axial load considering the strength.




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