Thrust ball bearing for FAG are designed to withstand thrust loads during high-speed operation and are composed of a washer-shaped ferrule with a raceway groove for ball rolling. Since the ferrule is cushion-shaped, Thrust ball bearing for FAG are divided into two types: flat base cushion type and self-aligning spherical seat cushion type. In addition, this kind of bearing can bear axial load, but cannot bear radial load.
Thrust ball bearing for FAG composition: Thrust ball bearings are composed of three parts: seat ring, shaft ring and steel ball cage assembly. The shaft ring that matches the shaft is called the shaft ring, and the seat ring that matches the housing is called the seat ring.
Type: Divided into one-way thrust ball bearings and two-way thrust ball bearings. One-way thrust ball bearings can withstand one-way axial load. Bidirectional thrust ball bearings can withstand bidirectional axial loads, in which the shaft ring matches the shaft. The mounting surface of the seat ring is a spherical bearing, which has self-aligning performance and can reduce the impact of installation errors. Thrust ball bearings cannot bear radial load and have a low limit speed.
There are two key points in the assembly of Thrust ball bearing for FAG. One is to control the quality of the cage and steel ball pressing, and the other is to control the nominal height T after the bearing is assembled. In addition, since the shaft ring and seat ring can be separated, it brings a management problem. This is to prevent imported bearing parts from being mixed. The M-type stamping cage uses a flange assembly mold. After pressing, the steel ball is required to rotate flexibly in the pocket, but cannot fall off from the pocket, and the amount of movement of the steel ball in the pocket must be checked according to technical procedures. If the physical cage is imprinted too deeply, the movement of the steel ball will be small, and the connection between the imprinted convex part and the cage is too small and the strength is insufficient. Blocks may easily fall off, causing the cage to be scrapped. The inner diameter difference between the small thrust ball bearing seat ring and the shaft ring is very small, and there is no obvious difference between the two sets. In order to prevent the phenomenon of mixed sets, that is, it is found that two of the assembled bearings are both seat rings or shaft rings. This requires taking certain measures. Usually, auxiliary tooling is used to distinguish the seat ring and the seat ring when fitting, or the inner diameter plug gauge is used to check the inner diameter size before randomly checking the nominal height. In order to facilitate the inspection of the inner diameter, the seat ring is placed below and the shaft ring is placed above. If the inner diameter of the seat ring has obvious quenching and heating oxidation color or has not been ground, there is no need to check the inner diameter size. The difference between the shaft ring and the seat ring can be clearly seen, and it is not easy to mix. After the thrust ball bearing is assembled, the nominal height T must be measured to confirm whether it is qualified. When measuring, use a height block or standard part to calibrate and measure the load. The bearing needs to rotate dozens of times and must reach the minimum height.
When a thrust ball bearing operates at high speed, the contact angle between the steel ball and the radial plane of the raceway will be affected by centrifugal force, causing the steel ball to slide relative to the raceway. Adhesive wear caused by this sliding can damage the bearings. In order to prevent this damage, the minimum load on the thrust ball bearing must be ensured, see Formula 1 or Formula 2, whichever is the larger calculated value.
Formula 1: Famin=K?n*n
Formula 2: Famin=Coa/1000
Famin: minimum axial load (N)
K: Minimum axial load factor
n: rotation speed (per minute)
Coa: basic static load rating (N)
One-way thrust ball bearings can only bear loads in one direction. If they bear loads in two directions, two-way thrust ball bearings must be selected. Thrust ball bearings must be subjected to a minimum load or preload. When the shaft is vertical, the weight of the shaft usually exceeds the minimum load. At this time, due to the influence of the axial external load in the opposite direction, the acting load may be reduced.
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