Angular contact ball bearingsThe comparison between positioning preload and constant pressure preload is that when the amount of preload is equal, the effect of positioning preload on the rigidity of the bearing is greater, and the effect of the change of rigidity on the bearing load during positioning preload is much smaller.
In the application of positioning preload, due to the influence of 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, etc., the preload amount will be changed, and the change of preload can be ignored in the application of constant pressure preload.
Since there is a certain relationship between the radial and axial clearance of angular contact ball bearings and tapered roller bearings, only one number is required to specify when it comes to clearance, and in most cases the axial clearance is the main parameter.
When adjusting the clearance or preload of a bearing, it is possible to loosen or lock the nut on the shaft or certain threaded components in the housing, such as retaining rings, after the bearing has reached zero clearance.
Another option is to add some spacers or washers whose thickness is calculated in the direction between the inner ring or the outer ring and the abutment. The specific method to choose to measure or adjust the clearance is usually considered and decided according to the number of adjustments.
The use of dial gauges is used to measure axial clearance, for example in the arrangement of wheel bearings. When measuring or adjusting the clearance of tapered roller bearings, the shaft or housing should be rotated repeatedly for several weeks to ensure that the large end face of the roller has excellent contact with the flange of the inner ring.
Otherwise, the accuracy of the measurement result will be affected, and the preset clearance or preload cannot be adjusted.
Axial preload of angular contact ball bearings: The axial preload method can be roughly divided into two types: positioning preload and constant pressure preload.
In the positioning preload, the appropriate preload can be obtained by adjusting the size of the bushing or the gasket, and the appropriate preload can also be adjusted by measuring or controlling the starting friction torque, and the pair of duplex bearings that pre-adjust the preload amount can also be directly used to complete the purpose of preloading, and the user generally does not need to adjust it again at this moment, but where the bearing is preloaded by the axial direction, its relative orientation will not change when it is used.
Constant pressure preloading is a method of using spiral tension springs, disc tension springs, etc. to make the bearing get suitable preloading. The rigidity of the preload tension spring is generally much smaller than the rigidity of the bearing, so the relative orientation of the bearing with constant pressure and preload will change in application, but the amount of preload will be roughly the same.
Angular contact ball bearing radial preloading: radial jacking method is mostly used in the tapered bore bearing bearing in radial direction, for example, the double-row precision short cylindrical roller bearing uses a nut to adjust the axial orientation of this bearing relative to the tapered journal, so that the inner ring has an appropriate amount of expansion and obtains radial negative clearance, which is mostly used in machine tool spindles and jet engines.
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