(1) The bearing is difficult to rotate and generates heat;
(2) The bearing operation has a strange sound;
(3) The bearing generates vibration;
(4) The inner race is peeled off and cracked;
(5) Exfoliation and cracking of the outer race;
(6) Indentation is produced in the bearing raceway and the rolling elements.
2. Analysis of the cause of the failure
(1) The inspection before assembly is not careful. The bearings should be cleaned before assembly and carefully inspect the inner and outer races, rolling elements and cages of the bearings for rust, burrs, bumps and cracks; check whether the bearing clearance is suitable and rotate. Whether it is brisk and free, whether there is sudden locking; at the same time, check the size of the shaft diameter and the housing hole, roundness and cylindricity and whether the surface has burrs or unevenness. For the split bearing housing, between the bearing surface of the bearing cap and the bearing base and the outer circular surface of the outer race, a clearance of 0.1mm~0.25mm should be reserved to prevent the "waist" on both sides of the outer seat from being clipped. The gap caused by the phenomenon of “help” is reduced, the wear is accelerated, and the bearing is damaged prematurely.
(2) Improper assembly. Improper assembly can result in the various failure modes described above for the bearing, as well as the following:
A. Improper cooperation
The inner hole of the bearing and the shaft are matched by the base hole, and the outer circumference of the bearing and the bearing housing hole are made by the base shaft. Generally, the shaft and bearing inner race of centrifugal pump, centrifuge, reducer, motor and centrifugal compressor working under normal load conditions are matched with j5, js5, js6, k5, k6, m6, bearing housing bore and bearing The outer race is made of j6 and j7. Rotating races (the inner race of most bearings is a rotating race, the outer race is not a rotary race, and the other races are the opposite). Usually an interference fit is used to avoid the race diameter of the race under load. Rolling and sliding occur on the mating surface of the housing bore.
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