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/*728*90 created on 2018/5/16*/ var cpro_id = "u3440131"; Home>Bearing knowledge>Classification and function of imported bearing preload Classification and function of preloading of imported bearings
The pre-tightening method is divided into two categories: radial pre-tightening method and axial pre-tightening method; the following is described. /*250*250 was created on 2017/12/25*/ var cpro_id = 'u3171089';
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 pre-tightening method can be generally divided into two types: positioning pre-tightening and constant-pressure pre-tightening. In positioning pre-tightening; by adjusting the dimensions of the bushing or gasket; obtaining appropriate pre-tightening amount, also The pre-tightening can be adjusted by measuring or manipulating the starting conflict torque; the paired double-bearing bearing pre-adjusting the pre-tightening amount can be directly used to complete the pre-tightening intention; at present, the user usually does not need to adjust again; However, the bearings that are axially pre-tensioned must not change their relative orientation when used. The constant pressure pre-tightening is to use a spiral spring, a disc spring, etc. to make the bearing suitable for pre-tightening. Preload the rigidity of the spring. Generally, it is much smaller than the rigidity of the bearing; therefore, the relative orientation of the bearing with constant pressure preload will change during operation; however, the preload is almost constant.
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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Classification and function of preloading of imported bearings
Source: China Bearing Network Time: 2014-08-04