Preloading intentions and methods for SKF bearings

Source: China Bearing Network Time: 2013-06-10

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SKF imported bearings; in most occasions; in working condition: with proper clearance application. According to the intention; also when assembling the bearing; pre-stress the bearing internal stress; so that the bearing has a negative play to apply; This method of operation is called preload. It is mostly suitable for such as centripetal thrust ball bearings; tapered roller bearings; the two bearings are used oppositely; it becomes a bearing capable of adjusting the clearance.
1. The primary intent of preloading: the primary intent and representation of preloading, such as the ability to give some examples to prove that:
(1) Together with the orientation of the radial axis and the axial direction of the correct resolution axis; the beating of the æº axis.
(2) The rigidity of the progressive bearing. The bearing of the spindle of the machine tool; the SKF imported bearing for the differential organization of the bicycle.
(3) Avoid axial direction oscillation and abnormal sound formed by resonance. Bearings for small motors.
(4) Pressing the rotary sliding of the tumbling roll; revolving sliding and rotating sliding. High-speed rotating radial thrust bearing; thrust ball bearing.
(5) Pair and ferrule; adhere to the correct orientation of the rolling body. Thrust ball bearing; thrust spherical roller bearing; used in the horizontal axis.
2. The method of preloading: positioning preload is the relative orientation of the bearing axis of the opposite SKF bearing; the preloading method which will not be changed in operation. Here is an example:
(1) In order to perform the preload, the combined bearing with the difference in width or axial clearance is adjusted beforehand.
(2) Using an oversized cushion; a shim; to give the bearing a preload.
(3) Fasten the screw that can adjust the axial direction clearance; the method after the nut is used. In this case; in order to get the proper preload amount;
The so-called constant pressure preload; is the use of spiral spring; disc spring; give the bearing the proper preparation of the load. In use; the relative orientation of the bearing even if there is a change; the preload method. In use; Even if there is a change in the relative orientation of the exit, the preload can be roughly adhered to.
Preload line diagram of SKF imported bearings after constant pressure preload; the rigidity of the preload spring is compared with the rigidity of the bearing; usually it is very good. The stupidity of the predecessor is stupid and the æ’¸ æ’¸ æ’¸ æ’¸ æ’¸ æ’¸ æ’¸ æ’¸ å« å« å« å« å« å« å« å«ã„‘ä¹–ã˜ ã„‘ä¹–ã˜ å‚» å‚» ãƒŒé€¯å²¢ ãƒŒé€¯å²¢ ãƒŒé€¯å²¢ æ‹› æ‹› æ‹› æ‹› æ‹› é—ª é—ª é—ª é—ª é—ª å®šä½ å®šä½ å®šä½ å®šä½ å®šä½ å®šä½ å®šä½ å®šä½ å®šä½ å®šä½ å®šä½ å®šä½ å®šä½ å®šä½ å®šä½ å®šä½ å®šä½ å®šä½ å®šä½ å®šä½ å®šä½SKF imported bearings and bearing unit rigidity comparison.
According to the rigidity of the preload method, the comparison between the positioning preload and the constant pressure preload is as follows.
(1) The preload is flat; the positioning preload is used to add bearing rigidity; that is, the positioning preload is the smallest displacement of the SKF bearing load.
(2) Positioning preload. In operation; the difference in axial elongation due to the temperature difference between the shaft and the outer casing; the difference in radial thermal expansion formed by the temperature difference of the inner ring outer ring; and the deformation caused by the load; The preload amount is changed. Under the condition of positioning the preload; the tension spring formed by the elasticity of the shaft has little weight; therefore, the change of the preload can be ignored. It is known that the positioning preload is usually applied. The intention of progressive rigidity; constant pressure preload is suitable for high speed rotation; demand avoids axial oscillation; the condition of the horizontal shaft using thrust bearing.

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