The method of rolling bearing preload


Posted May 6, 2014 by iothjnfdb

Radial top tight method using more cone bearings in bear radial load, a typical example is the double row precision short cylindrical roller bearing

 
  Preloaded into radial preload method and axial preload method two kinds big, simple introduction is as follows:
  1. The method of radial preload
  Radial top tight method using more cone bearings in bear radial load, a typical example is the double row precision short cylindrical roller bearing, using the nut to adjust the NSK 6305DU Bearing Structure http://www.fagbearings-hk.com/newproduct/NSK-6305DU-bearings-30910.html axial position relative to the conical journal, that the expansion of the inner ring with appropriate amount, get the radial clearance, this method is more used in machine tool spindle and jet engines.
  2. The method of axial preload
  Axial preload method in general can be divided into two locating preloaded and constant pressure preload.
  In positioning preloaded, can be adjusted through sleeve or the size of the gasket, obtain proper preload; Can also be a tuning by measurement or control starting friction torque suitable pre-tightening; Can also be used directly in advance amount adjusted the preload double bearings in pairs to achieve the purpose of the pre-tightening, generally do not need to users adjust any right now, all in all, by the bearing axial preload, when using its relative position will not change. Constant pressure preload is to use such as spiral spring, disc springs for bearing pre-tightening appropriate methods. Preloaded spring rigidity, much lower than the stiffness of bearing, so the relative positions of constant pressure preload bearing in use will have change, but the preloaded were roughly the same amount.
  Positioning the preloaded with constant pressure preload is as follows:
  (1) equals the amount in preload, positioning preloaded bigger effect on the bearing stiffness increases, and positioning when the preloaded stiffness change influence on bearing load are much smaller.
(2) positioning preloaded in use, due to the difference in temperature between shaft and bearing axial length difference, the difference in temperature between inside and outside the circle caused by radial expansion volume and the displacement caused by load, the influence of prestressing quantity will make changes; In use, and the constant pressure preload preload changes can be neglected.
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Issued By gjhses
Website NSK 6305DU Bearing Structure
Country Hong Kong SAR
Categories Business
Last Updated May 6, 2014