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Preloading method for rolling bearings
Source: China Bearing Network Time: 2013-10-21
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1. Radial preloading method The radial topping method is mostly used in tapered bore bearings that accept radial loads; typically, for example, double row fine short cylindrical roller bearings; the use of nuts to adjust the axis of such bearings relative to the tapered journal Orientation; make the inner ring have a suitable amount of expansion to obtain a radial negative clearance; this method is mostly used in machine tool spindles and jet engines.
2. The axial preloading method is generally divided into two types: positioning preloading and constant pressure preloading.
In the positioning pre-tightening; the scale of the bushing or the gasket can be adjusted; the appropriate pre-tightening amount can be obtained, and the appropriate pre-tightening can be adjusted by measuring or controlling the starting conflicting torque; Pairs of double-bearing bearings to complete the pre-tightening intention; at this moment usually no need for the user to adjust; total; but the bearings through the axial pre-tightening; the relative orientation of the bearing must not change.
The constant pressure pre-tightening is to use a spiral spring, a disc spring, etc. to make the bearing suitable for pre-tightening. The rigidity of the pre-tension spring is much smaller than the rigidity of the bearing; therefore, the relative orientation of the bearing of the constant pressure preload is There will be changes in the application; however, the amount of preload is almost unchanged.
The comparison between positioning preload and constant pressure preload is as follows:
(1) When the pre-tightening amount is flat; the positioning pre-tightening has a greater effect on the bearing rigidity; and the influence of the rigidity change on the bearing load during positioning pre-tightening is also much smaller.
(2) Positioning pre-tightening in operation; axial length difference due to temperature difference between shaft and bearing housing; large amount of radial expansion caused by temperature difference between inner and outer rings; displacement caused by load; The amount changes, while the constant pressure preload is in use; the change in preload is negligible.
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