Imported SKF bearings, in most occasions, are used with proper clearance under running conditions. According to different purposes, when assembling the bearing, internal stress is generated in the bearing in advance so that the bearing can be used with negative clearance. This method of use is called preload. It is mostly suitable for radial thrust ball bearings and tapered roller bearings. The two bearings are used oppositely to become a bearing that can adjust the clearance.

1. The main purpose of preload: the main purpose of preload and representative examples can be cited some examples to prove and understand:

(1) While accurately determining the position of the shaft in the radial direction and the axial direction, it suppresses the shaft runout.

(2) Improve the rigidity of the bearing. Bearings for the main shaft of the machine tool, and imported SKF bearings for the pinion gears of the bicycle differential mechanism.

(3) Prevent axial vibration and abnormal noise caused by resonance. Bearings for small motors.

(4) Suppress the rotating sliding, revolving sliding and rotating sliding of the rolling elements. High-speed rotating centripetal thrust bearings, thrust ball bearings.

(5) Align with the ferrule, and keep the correct position of the rolling element. Thrust ball bearings and thrust spherical roller bearings are used for horizontal shafts.

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2. About the preload method: the positioning preload is the relative position of the opposite SKF imported bearing in the axial direction, which will not change during use. Here can be an example:

(1) A method of tightening a combined bearing whose width difference or axial clearance has been adjusted in advance for preloading.

(2) Use adjusted size gaskets and shims to give the bearing preload.

(3) The method used after tightening the screw and nut that can adjust the axial clearance. In this case, in order to obtain an appropriate amount of preload, it is necessary to measure the starting friction torque and adjust it.

The so-called constant pressure preload is a method that uses coil springs and disc springs to give the bearings an appropriate preload. In use, even if the relative position of the bearing changes, preload method. In use, even if the relative position that will go out changes, the preload can be roughly kept constant.

The preload line diagram of SKF imported bearings after constant pressure preload. The rigidity of the preload spring is usually very small compared with the rigidity of the bearing. Therefore, the spring displacement line is approximately parallel to the horizontal axis. Therefore, the constant pressure preload The rigidity of the loaded single bearing is approximately equal to the rigidity of the single bearing that has been preloaded with an axial load. Comparison of rigidity of imported SKF bearings and bearing monomers after positioning preload and constant pressure preload.

According to the rigidity comparison of the preload method, the comparison of the positioning preload and the constant pressure preload is as follows.

(1) When the preload is equal, the positioning preload is effective to increase the rigidity of the bearing, that is, the displacement of the positioning preload is the smallest for the load of the SKF imported bearing.

(2) Positioning preload. During operation, the difference in axial elongation caused by the temperature difference between the shaft and the housing, the difference in radial thermal expansion caused by the temperature difference between the inner ring and the outer ring, and the deformation caused by the load change the preload. In the case of positioning preload, the upper weight of the spring due to the expansion and contraction of the shaft is small, so the change of the preload can be ignored. It can be seen from this that the general positioning preload is suitable for the purpose of improving rigidity, and the constant pressure preload is suitable for high-speed rotation, and the axial vibration needs to be prevented, and the horizontal shaft uses a thrust bearing.