The comparison between precise positioning preload and constant pressure preload of high-speed angular contact ceramic ball bearings depends on the same preload. Precise positioning and preloading have a greater effect on bearing stiffness, and the rigidity change during precise positioning and preloading has a greater effect on bearing load. The impact is also much smaller. Precise positioning and preloading During use, the axial length difference caused by the temperature difference between the shaft and the bearing seat, the radial expansion caused by the temperature difference in the inner and outer rings, and the offset caused by the load will make the The amount of preload changes, but the change of preload can be ignored during the use of constant pressure preload. Because 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 problems, only one of the standard values ​​needs to be specified, and in most cases it is required Take the axial clearance as the basic parameter. When adjusting the clearance or preload of the bearing, you can also loosen or tighten the nut in the shaft or some threaded components in the bearing seat, such as flat washers, after the bearing reaches zero clearance. Another method is to add some gaskets or sealing rings calculated by the thickness of the inner ring or the middle position between the outer side and the shoulder. The specific method to use to measure or change the clearance is generally considered and determined based on the number to be adjusted. The application of micrometers is one of the methods used to accurately measure axial play, such as for accurate measurement of wheel bearing arrangements. When measuring or changing the clearance of tapered roller bearings, it is necessary to continuously drive the shaft or bearing seat for several weeks to ensure that the large port of the roller bearing has a good contact with the rib of the inner hole. Otherwise, the accuracy of the measured value will not be adjusted to the pre-set clearance or preload at all. Axial preloading of angular contact ball bearings: The axial preloading method can be roughly divided into two types: precise positioning preloading and constant pressure preloading. In the precise positioning preload, the appropriate preload can be obtained by adjusting the size of the shaft sleeve or the gasket, and the appropriate preload can also be adjusted by accurately measuring or manipulating the starting friction torque, or directly using the pre-adjusted preload The preloading effect is achieved by measuring double and double-connected bearings. At this time, the customer generally does not need to adjust again. However, the positional relationship of bearings that are preloaded in the axial direction will never change during use. For constant pressure pre-tightening, compression springs, butterfly springs, etc. should be used to obtain suitable pre-tightening methods for the bearings. The stiffness of the preloaded torsion spring is generally much smaller than that of the bearing, so the position relationship of the bearing with constant pressure preload will change during use, but the preload will probably not change. Radial preloading of angular contact ball bearings: The radial top-tightening method is mostly used in bearings with tapered bores that bear radial loads. Typically, double-row high-precision short cylindrical roller bearings use nuts to adjust such bearings. The axial part of the cone-shaped motor shaft enables the inner hole to have a suitable expansion amount to obtain a radial negative clearance. This method is generally used in lathe spindles and jet engines. Only when the torque is accurate can the rotation be stable! (http://)
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