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Preload method is divided into radial and axial preload preload method for two categories

Date锛2013-09-18 9:43:19

Preload method is divided into radial and axial preload preload method for two categories, a brief introduction is as follows:

A radial preload method

Radial top tight fado using the radial load of the tapered bore bearings, the typical example is precision double row cylindrical roller bearings, use nuts to adjust relative to the tapered journal bearing axial position, so that the inner circle have the right to obtain the amount of radial expansion negative clearance, this method is used for machine tool spindle and jet engines.

2 axial preload method

Axial preload method can be divided into positioning preload and constant pressure preload two kinds.

Pretension in the positioning can be adjusted to the size of the bushing or gasket, get the right amount of preload; also available through friction torque measurement or control starting to get the right preload; can directly use the pre-adjusted amount of preload the paired bearings to achieve the purpose of pretension, this time users generally do not need re-adjustment, in short, all through the axial bearing preload, use the relative position certainly will not change.

Constant pressure preload is to use helical springs, disc springs, etc. to get the right bearing preload method. Spring preload rigid - like much smaller than the rigidity of the bearing, so the constant pressure preload bearings relative position will change in use, but the amount of preload was largely unchanged.

Positioning preload and constant pressure preload is as follows:

(1) in the same amount of preload, the positioning preload effect of the increased rigidity of the bearing is large, and the positioning of the bearing preload variation in stiffness of the load is smaller.

(2) positioned preload in use, the shaft and the bearing axial length of the temperature difference caused by the difference, the temperature difference between inner and outer rings caused by the amount of radial expansion and displacement caused by the load of the impact will preload volume changes; rather constant pressure preload in use, changes in preload negligible.

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