The thrust ball bearing is designed to withstand thrust loads during high-speed operation and consists of a ring with rolling grooves for the balls. Due to the cushion shaped ring, thrust ball bearings are divided into two types: flat bottomed cushion type and self-aligning spherical cushion type. And this type of bearing can withstand axial loads, but cannot withstand radial loads.

There are two key points in the assembly of thrust ball bearings:

One is the control of the quality of the cage and steel ball compression, and the other is the control of the nominal height T after bearing assembly.

In addition, due to the fact that both the shaft ring and the seat ring can be separated, there is a management issue of preventing the mixing of imported bearing parts.

The M-type stamping cage uses a bent edge assembly mold. After pressing, the steel ball is required to rotate flexibly in the pocket hole, but cannot fall off from the pocket hole, and the technical regulations check the amount of play of the steel ball in the pocket hole.

If the solid holder is pressed too deeply, the amount of movement of the steel ball will be small, and the connection between the pressed protrusion and the holder will be insufficient, resulting in insufficient strength and easy occurrence of falling blocks, causing the holder to be scrapped.

The difference in size between the inner diameter of the small thrust ball bearing seat ring and the shaft ring is very small, and there is no significant difference between the two sets. In order to prevent mixing, it was found that both sets of bearings were seat rings or shaft rings.

This requires certain measures to be taken. Usually, when fitting, auxiliary fixtures are used to distinguish between the pull ring and the seat group, or the inner diameter size is checked with an inner diameter plug gauge before the nominal height is checked. For the convenience of checking 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 inspect 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 them up.

After the assembly of the thrust ball bearing, the nominal height T needs to be measured to confirm whether it is qualified. When measuring, calibrate with height blocks or standard parts and measure the load. The bearing needs to rotate dozens of times to reach the minimum height.

When the 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. The adhesive wear caused by this sliding will damage the bearings.

To prevent such damage, it is necessary to ensure the minimum load that the thrust ball shaft can withstand, as shown in Formula 1 or Formula 2, whichever is greater in the calculated value.

Formula 1: Famin=K? n*n

Formula 2: Famin=Coa/1000

Famin: Minimum axial load (N)

K: Minimum axial load factor

n: Speed (per minute)

Coa: Basic rated static load (N)

A unidirectional thrust ball bearing can only withstand loads in one direction. If it can withstand loads in two directions, a bidirectional thrust ball bearing must be selected.

Thrust ball bearings must be subjected to a minimum load or preload. When the axis is vertical, the weight of the axis usually exceeds the minimum load. At this time, due to the influence of the axial external load in the opposite direction, the load acting on it may decrease.