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Usually, the shaft is supported in the radial and axial rolling bearings in two, at this time, the SKF bearings side are called fixed side bearing, it bear radial and axial load from two, relative axial displacement between the fixed shaft and bearing box function. The other side is called the free side, only bear radial load, axial and can move relatively, so as to solve interval error caused by the temperature change of the shaft extension part and the installation of bearings.
For the fixed side FAG bearings, need to choose available on the rolling surface axial movement (such as cylindrical roller bearing) or by fitting surface mobile (such as radial ball bearings) bearing. In the short axis of the fixed side and free side, no other cases, using bearings only one-way fixed axial movement (such as radial thrust ball bearing)
Analysis method of project selection
1) the installation space of the bearing clearance of rolling bearings can accommodate to NSK bearings installation bearing 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) the size, direction and nature of load bearing load bearing load variations, such as whether the size of the load, only the radial load, axial load is a one-way or two-way, the degree of vibration or shock. After considering these factors, and then to select the most suitable type TIMKEN bearings.
3) speed can meet the speed limit bearing type bearing mechanical speed not only take on the bearing types is limited to bearing size, cage type, precision grade, load condition and lubrication way, therefore, must be considered when choosing these factors.
4) rotation precision with KOYO bearings type machine tool spindle, the required rotation accuracy of gas turbine and the control of the machine are high rotation accuracy, high speed and low friction, then should use bearing precision grade 5 above.
5) the type of bearing rigidity needed to satisfy the mechanical shaft rigidity gear 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.
6) misalignment angular displacement between the transmission shaft and the bearing seat can be produced, in the following situations such as: driving shaft bending in the running load (buckling), processing the bearing in the bearing seat height of each are not identical, or bearing drive shaft bearing seat and are too far apart. The rigid INA bearings, deep groove ball bearings and cylindrical roller bearings, must not allow any wrong, or can only allow very small misalignment, unless imposed by external force. However, self-aligning bearing, namely, self-aligning ball bearings, spherical roller bearings, roller bearings and spherical roller thrust bearings, can allow caused by load misalignment error, also can not compensate for initial processing and installation error.
7) 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 bearings, self-aligning roller bearing)
8) 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.
| Product Model | Inside Diameter | Outside Diameter | Thickness |
| 32212U NTN | 60 | 110 | 28 |
| 4T-30212 NTN | 60 | 110 | 22 |