Rolling
assembly of fitter fitter assembly and repair work is often done in an
operation, and rolling bearing clearance adjustment and preload rolling
bearing assembly is an important part of the work. Accurately grasp the concept of clearance adjustment and
pre-tensioning process, and the correct use of this assembly process
workmanship is the guarantee of bearing assembly quality.
Rolling bearing clearance is a case of a fixed ring, the other ring
along the radial or axial maximum amount of activity, so the clearance
is divided into radial clearance and axial clearance of two.
Rolling bearing assembly, the clearance can not be too large, it can not be too small. If
the clearance is too large, the number of rolling elements that will
bear the load will decrease at the same time, so that the load of a
single rolling element will increase, thus reducing the bearing's
rotation accuracy and reducing the service life. If the clearance is too
small, the friction will increase The increased heat, aggravate the wear and tear, the same can reduce the bearing life. Therefore, many bearings in the assembly must be strictly controlled and adjust the clearance.
Preload
is the bearing assembly, to the bearing inner ring or outer ring an
axial force to eliminate bearing clearance, and the rolling body and
inner and outer ring contact at the initial deformation. Preload can improve bearing stiffness and rotation accuracy in working condition. For bearing a larger load, higher precision bearings require a large
amount of clearance or even interference with a small amount of work, in
which case the bearing needs to be preloaded during assembly.
Clearance adjustment and preload are usually used to make the bearing
inner ring on the outer ring for the appropriate axial relative
displacement method to complete.
From
the above concept of technology is not difficult to see that through
the adjustment of the rolling bearing clearance, bearing capacity can be
increased and the rotation accuracy and improve bearing life. But
at the same time will make the bearing friction intensified, increased
heat, so adjust the clearance or preload must ensure good lubrication
and heat dissipation. If not properly adjusted or poor lubrication, it will in turn make the bearing wear and tear, reduce life expectancy.
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