Trouble Cause and Elimination Method of Fan Bearing

Analysis of the causes of failure: the two sides with the adapter sleeve and bearing bearing bearing fixed with. Re-test the occurrence of free-end bearing high temperature, high vibration value of the fault, open the bearing cap cover, manual slow rotary fan, found in a specific position of the shaft of the bearing roller, rolling in the non-load area. It is possible to determine that the clearance of the bearing operation is high and the installation gap may be insufficient. It is known that the internal clearance of the bearing is only 0.04mm and the uranium eccentricity is 0.08mm. As the left and right bearing span is large, it is difficult to avoid the deflection of the shaft or the angle of the bearing installation. Therefore, the large fan adopts the automatic heart Adjustable spherical roller bearings. However, when the internal clearance of the bearing is insufficient, the internal rolling element of the bearing is affected by the movement space, and its automatic heart function is affected, but the vibration value is increased. The internal clearance of the bearing decreases with the increase of the tightness and can not form the lubrication curve. When the bearing running gap is reduced to zero due to the temperature rise, if the heat generated by the bearing operation is still larger than the heat of dissipation, the bearing temperature Will quickly climb, then, if not immediately shut down, the bearing will burn, the bearing inner ring and the shaft with too tight in this case the abnormal operation of the reasons for high bearing.
Remedy: When handling, retract the adapter sleeve, re-adjust the shaft and the inner ring with the tightness, replace the bearing after the gap to take 0.10mm. Re-install the re-start the fan, bearing vibration and operating temperature are back to normal.
Bearing the internal gap is too small or the mechanical design and manufacture of poor precision, are the main reasons for the high operating bearing speed, to facilitate the installation of fan equipment; repair and maintenance, generally in the design of the use of tight sets of bearing cone hole Ring with the bearing bearing, but also easy due to the installation of the negligence of the problem, especially the appropriate gap of the withered. Bearing the internal gap is too small. Operating temperature increased rapidly: bearing inner ring hole and the adapter with too loose, the bearing prone to loose due to mating surface in the short term failure burn.