How to preload angular contact ball bearings?
How to preload angular contact ball bearings?
The comparison between positioning preloading and constant pressure preloading of angular contact ball bearings is that when the preloading amounts are equal, positioning preloading has a greater effect on increasing the bearing rigidity, and the impact of rigidity changes on the bearing load during positioning preloading is much smaller. During use of positioning preload, the preload amount will change due to the axial length difference caused by the temperature difference between the shaft and the bearing seat, the radial expansion caused by the temperature difference between the inner and outer rings, and the displacement caused by the load. , while the constant pressure preload is in use, the change in preload does not need to be considered.
Since there is a certain relationship between the radial clearance and axial clearance of angular contact ball bearings and tapered roller bearings, when it comes to clearance issues, you only need to specify one of the values, which in most cases is The axial clearance is the main parameter. When adjusting the clearance or preload of the bearing, you can loosen or tighten the nut on the shaft or some threaded parts in the bearing seat, such as retaining rings, after the bearing reaches zero clearance. Another method is to add some spacers or washers of calculated thickness between the inner or outer ring and the shoulder. Which method to use to measure or adjust the clearance is usually considered and decided based on the amount of adjustment required.
The use of a dial indicator is one of the methods used to measure axial clearance, for example in wheel hub bearing arrangements. When measuring or adjusting the clearance of a tapered roller bearing, the shaft or bearing seat should be repeatedly rotated for several weeks to ensure that the large end surface of the roller has good contact with the ribs of the inner ring. Otherwise, the accuracy of the measurement results will be affected, and the preset clearance or preload cannot be adjusted.
Axial preloading of angular contact ball bearings: The axial preloading method can be roughly divided into two types: positioning preloading and constant pressure preloading. In positioning preloading, the appropriate preload can be obtained by adjusting the size of the bushing or gasket, the appropriate preload can also be adjusted by measuring or controlling the starting friction torque, or the pre-adjusted preload can also be directly used Pairs of double bearings are used to achieve the purpose of preloading. At this time, the user generally does not need to adjust. The relative position of any bearing that has been axially preloaded will definitely not change during use. Constant pressure preloading is a method of using coil springs, disc springs, etc. to ensure that bearings are properly preloaded. The rigidity of the preload spring is generally much smaller than that of the bearing, so the relative position of the constant pressure preloaded bearing will change during use, but the preload amount will remain roughly unchanged.
Radial preloading of angular contact ball bearings: The radial tightening method is mostly used in tapered bore bearings that bear radial loads. A typical example is a double row precision short cylindrical roller bearing that uses a nut to adjust the bearing relative to the tapered shaft. The axial position of the neck allows the inner ring to have a suitable expansion amount to obtain radial negative clearance. This method is mostly used in machine tool spindles and jet engines.
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