Under normal circumstances, the ball bearing clearance has been fixed at the factory, but the angular contact ball bearing and the roller bearing can only adjust the clearance when installing, and can not be set at the factory, which causes trouble for many people. Especially for factories that don't know how to adjust the clearance, how should the clearance of angular contact ball bearings and roller bearings be adjusted? I will give you a detailed introduction today.
According to the requirements of the running parts on the bearing clearance, the clearance can be adjusted when the bearing is installed. The radial clearance can be adjusted with the type of bearing fit. For smaller clearances, the interference fit is used to shrink the outer ring of the bearing for a smaller play. A larger clearance can be obtained with a transition fit. When the bearing is subjected to axial force, the deep groove bearing and the tapered roller bearing need to adjust the axial clearance. The method of adjusting the axial clearance is mainly realized by adding a adjusting gasket between the bearing cap and the bearing outer ring surface.
Not all bearings need to adjust the clearance during installation. Only when relying on the bearing 怍 positioning, adjustment is required. For example, the machine shaft, the ordinary axial sway is within 0.005, and the precision is 0.0001 (machining center) or even higher. Moreover, the adjusted (play) is not only the free clearance of the bearing, but also the pre-deformation of the bearing.
That is to say, the adjusted bearing should have a pre-tightening force. The pre-tightening force is related to the bearing speed of your design, allowing the load and lubrication method. For example, the pre-tightening force of the tool grinding head spindle bearing is 8~12Kg. In the actual adjustment, the existing fitting size of the bearing is adjusted to adjust the pre-tightening force within a suitable range by adjusting the thickness of the inner and outer spacers between the two disc bearings. The experienced master can press the inner ring under the condition of compacting the inner ring. According to the size of the outer spacer force, the pre-tightening force is correctly judged, and a large amount of adjustment time is saved.
