The assembly of plane bearing is the basic operation of fitter assembly and repair, and the adjustment and pre tightening of clearance is an important part of IKO bearing assembly.
Accurately grasping the process concept of clearance adjustment and pre tightening and correctly using this process method in the assembly work is the guarantee of the assembly quality of plane bearing.
Adjustment and pre tightening of clearance of IKO plane bearing
The clearance of plane bearing refers to the large amount of activity made by the other ring along the radial or axial direction when one ring is fixed, so the clearance is divided into radial clearance and axial clearance. When assembling IKO bearing, the clearance shall not be too large or too small.
Too large clearance will reduce the number of rolling elements bearing load at the same time and increase the load of a single rolling element, so as to reduce the rotation accuracy and service life of IKO bearing;
If the clearance is too small, the friction will increase, the heat generated will increase, and the wear will be intensified, which can also reduce the service life of the bearing. Therefore, the clearance of plane bearing should be strictly controlled and adjusted during assembly.Adjustment and pre tightening of clearance of IKO plane bearing
Preloading is to give an axial force to the inner ring or outer ring during the assembly of plane bearing, so as to eliminate the clearance of IKO bearing and produce initial deformation at the contact between the rolling element and the inner and outer rings. Preloading can improve the stiffness and rotation accuracy of the bearing in the working state.
Adjustment and pre tightening of clearance of IKO plane bearing
Most bearings with large load and high rotation accuracy requirements work in the state of no clearance or even a small amount of interference.Adjustment and pre tightening of clearance of IKO plane bearing
In this case, it is necessary to preload the bearing during assembly. The clearance adjustment and pre tightening are usually completed by making appropriate axial relative displacement of the inner ring to the outer ring.
From the above technological concepts, it is not difficult to see that the bearing capacity and rotation accuracy of plane bearing can be improved and the service life of bearing can be improved by adjusting the clearance of rolling bearing. But at the same time, it will aggravate the bearing friction and increase the calorific value, so good lubrication and heat dissipation must be ensured when adjusting the clearance or preload.
Improper adjustment or poor lubrication will in turn aggravate the wear of IKO bearing and reduce its service life. To correctly adjust and pre tighten the clearance of plane bearing, we should also pay attention to the following problems.Adjustment and pre tightening of clearance of IKO plane bearing
fatigue life
IKO bearing bears a certain load during operation, even static load, but the stress of steel ball and raceway is cyclic, and the material will have rolling fatigue, so as to make the imported bearing reach its service life. The phenomenon is that a part of the rolling surface material suddenly falls off like a fish scale. This phenomenon is called fatigue flaking.Adjustment and pre tightening of clearance of IKO plane bearing
Noise life
For the bearing of household appliances, the load borne by the roller bearing is very small and the service life of the bearing is very long. However, after the shaft rotates for a period of time, it will also produce wear, increased vibration and noise, deterioration of lubricating grease, etc.
Due to the strict requirements on the noise of household appliance bearings, when the noise of IKO bearings exceeds the allowable range, it is considered that the bearings can no longer be used. The total time of low noise operation of roller bearing is called bearing noise life.Adjustment and pre tightening of clearance of IKO plane bearing
Lubrication life
IKO bearings of household appliances usually adopt maintenance free grease lubricated sealed bearings. Although only a small amount of lubricant is needed for roller bearing lubrication, the roller bearing fails due to the deterioration and leakage of lubricating grease after a long time of operation.
The total time that the bearing runs under good lubrication is called the bearing life.Adjustment and pre tightening of clearance of IKO plane bearing
For light load bearings, the noise life and lubrication life of roller bearings are shorter than the fatigue life of bearings. For example, as long as the IKO bearing is selected and installed correctly, it can fully meet the life matching requirements of the host.
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