The principle of precision thrust bearing

The precision thrust bearing mainly bears the axial load in the assembly, and it is widely used. Although the installation operation of the precision thrust bearing is relatively simple, errors still often occur during actual maintenance, that is, the installation position of the tight ring and the loose ring of the bearing is 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, the following points should be paid attention to when installing the precision thrust bearing.

(1) Distinguish between the tight ring and the loose ring of the precision thrust bearing (judging by the inner diameter of the bearing, the difference in diameter 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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