Principle of radial thrust bearings

Although the installation operation of radial thrust bearings is relatively simple, errors often occur during actual maintenance, that is, the installation positions of the tight and loose rings of radial thrust bearings are incorrect, resulting in the failure of the bearing and the rapid wear of the journal. The tightening ring is installed on the end face of the stationary part, i.e. wrong assembly. The inner ring of the tight ring and the journal are in transition fit. When the shaft rotates, the tight ring is driven and friction occurs with the end face of the stationary part. When the axial force (Fx) is applied, the friction torque will be greater than the matching resistance torque of the inner diameter, resulting in tightness. The mating surface of the ring and the shaft is forced to rotate, which aggravates the wear of the journal.

Therefore, pay attention to the following points when installing radial thrust bearings.

(1) Distinguish between the tight ring and the loose ring of the bearing (judging by the inner diameter of the bearing, the difference in the diameter of the bearing is O.1 ~ O.5mm).

(2) Distinguish the static parts of the mechanism (that is, the parts that do not move, mainly referring to the assembly).

(3) In any case, the loose ring of the bearing should always rest on the end face of the stationary part.

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