The thrust ball bearing is a separate type of bearing, and the shaft ring and the race ring can be separated from the components of the cage and the steel ball. The shaft ring is a ferrule that cooperates with the shaft. The seat ring is a ferrule that matches the hole of the bearing housing, and there is a gap between the shaft. If improperly installed, it will directly affect its service life. So, how to install it correctly? Two key points for the installation of thrust ball bearings are the control of the quality of the cage and the ball press, and the other is the control of the nominal height T after the assembly of the bearing.
When installing a thrust bearing, check the verticality of the shaft ring and the centerline of the shaft. The method is to fix the dial gauge to the casing surface so that the contact of the watch top rotates the bearing on the bearing raceway raceway, and observe the dial gauge pointer. If the pointer is yawed, the shaft ring and the shaft center line are not perpendicular. When the case hole is deep, it can also be tested with an extended dial gauge.
When the thrust bearing is installed correctly, the seat ring can automatically adapt to the rolling of the rolling elements, ensuring that the rolling elements are located in the upper and lower ring raceways. If it is reversed, not only will the bearings work abnormally, but the mating surfaces will be severely worn. Since the difference between the shaft ring and the seat ring is not obvious, the assembly should be extra careful, and do not make mistakes. In addition, there should be a gap of 0.2-0.5mm between the seat ring of the thrust bearing and the bearing housing hole to compensate for the error caused by the machining and installation of the part. When the center of the bearing ring is offset during operation, the gap can be Make sure it is automatically adjusted to avoid friction and make it work properly. Otherwise, it will cause severe damage to the bearing.
Although the thrust bearing installation operation is relatively simple, although the thrust bearing installation operation is relatively simple, there are often errors in the actual maintenance, that is, the tight ring and the loose ring of the bearing are not installed correctly, that is, the tight ring and the loose ring of the bearing are installed. The position is incorrect, the result is that the bearing is out of action and the journal is quickly worn. The inner ring of the tight ring and the journal are in a transitional fit, and the journal is quickly worn away. The inner ring of the tight ring and the journal are in a transitional fit. When the shaft rotates, the tight ring is driven and friction is generated with the surface of the stationary part. When the shaft rotates, the tight ring is driven and friction is generated with the surface of the stationary part, and the axial force is applied (Fx When the friction torque is greater than the inner diameter and the resistance torque, the friction torque will be greater than the inner diameter and the resistance torque will be generated when the force (Fx) is applied. The guide (Fx) tightening ring and the shaft mating surface are forced to rotate, which aggravates the journal wear.
Therefore, the following points should be noted when installing the thrust bearing:
(1) Distinguish the tight ring and loose ring of the bearing (according to the inner diameter of the bearing, the diameter of the hole is divided into tight ring and loose ring O.1 ~ O.5mm). Poor O.1 ~ O.5mm).
(2) Distinguish the static parts of the mechanism (ie, the parts that do not move, mainly refer to the stationary parts of the assembly separation mechanism).
(3) In any case, the loose ring of the bearing should always rest on the face of the stationary part.
