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Internal clearance and preload of rolling mill bearings
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The original bearing clearance; refers to the amount of clearance between the inner ring, the outer ring and the rolling body before the bearing is not installed. The inner ring or the outer ring is fixed; the moving amount of the other side in the radial direction is called the clearance; The amount of movement in the axial direction is called axial clearance.
2, the choice of clearance
Because the bearing is in the inner ring of the device, the original clearance of the bearing will be correspondingly reduced; after the bearing receives the load, the internal bearing clearance of the bearing will be added accordingly; but the bearing will heat up inside the bearing; the inside and outside of the bearing The expansion of the ring is different; the internal clearance of the bearing will be reduced accordingly.
Bearing preload
According to the use of the bearing; some time requirements require a certain preload; the bearing is inside the negative clearance condition. This method is called preload; mostly used for angular touch ball bearings with tapered roller bearings.
Preloading intention
After the bearing is preloaded; always maintain a pre-pressure on the touch point of the rolling body and the ferrule; so that the bearing does not play under the division; the rigidity, rotation precision and positioning accuracy of the radial and axial displacement of the improved shaft No play occurs under load; the rigidity, rotation accuracy and positioning accuracy of the progressive shaft against radial and axial displacement, oscillating oscillation and noise, together with the rolling, the anti-sliding of the rolling body, the sliding of the autorotation, and the reduction of conflict.
Axial preload
The positioning preload refers to an axial preloading method in which the axial Woolz of the bearing adheres to the redness of the petroleum process.
Constant pressure preload
Constant pressure preload is an axial preloading method that assigns the axial preload of the bearing to be inconvenient in operation.
Radial preload
Radial preloading is a method of radial preloading; radial preloading refers to the use of interference cooperation to swell the inner ring; eliminating radial play;
A preloading method for preloading the bearing.
The purpose of radial preload is to add the number of tumbling bodies in the load zone; to improve the support stiffness. In high speed cylindrical roller bearings; the radial preload can be smaller under the effect of centrifugal force; the appearance of the rolling body and the raceway slip. Cone The bearing of the inner hole; the relative orientation of the inner ring and the adapter sleeve is adjusted by the lock nut; the radial clearance of the bearing is reduced; the radial preload is completed.
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