In precision machine tools and other mechanical equipment, the accuracy requirements of bearings are usually very high, so most of them will use YRT rotary table bearings. In most cases, in order to ensure the rigidity and accuracy of the bearings, the bearings will be preloaded.
1. Preload method of YRT rotary table bearing
1）. Radial preload method
The radial jacking method is mostly used in bearings that bear radial load. The nut is used to adjust the axial position of the bearing relative to the journal so that the inner ring has a proper amount of expansion to obtain a negative radial clearance. This method is mostly used In the machine spindle.
2）. Axial preload method
The axial preload method can be roughly divided into two types: positioning preload and constant pressure preload:
a. Positioning preload
In the positioning preload, you can adjust the size of the bush or gasket to obtain the proper preload; you can also measure or control the starting friction torque to adjust the proper preload; you can also use the pre-adjusted preload directly To achieve the purpose of pre-tightening, there is generally no need for adjustment at this time. For bearings that have been axially pre-tightened, their relative position will definitely not change during use.
b. Constant pressure pre-tightening
Constant pressure preloading is a method of using coil springs, disc springs, etc. to properly preload the bearings. The rigidity of the preload spring is generally much smaller than the rigidity of the bearing, so the relative position of the bearing preloaded under constant pressure will change during use, but the preload is roughly the same.
2. Comparison of positioning and constant pressure preloading for YRT turntable bearing
1). When the preload is equal, the effect of bearing rigidity increases is greater, and the influence of rigidity change on bearing load is much less.
2). In use, the axial length difference caused by the temperature difference between the shaft and the bearing housing, the radial expansion caused by the temperature difference between the inner and outer rings, and the displacement caused by the load will change the preload. However, the change of the preload can be ignored in the application of the fixed pressure preload.
The above is the pre-tightening method of YRT turntable bearing. Even if the bearing bears a large load, it will not deform greatly, which is very beneficial to prolong its service life. YRT turntable bearing is one of the main products of Luoyang Tedin Bearing Co., Ltd. At the same time, Tedin also has a number of experienced professional teams of bearing manufacturing, processing, and inspection. We can provide high-quality technical services in bearing preloading. If any need, please contact us by leaving a message on our website or call our customer service hotline for a detailed consultation.
Please check the Product Guide to select suitable bearings for your machinery.
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