What do you know about the common sense of thrust ball bearings?

Thrust ball bearing is a separate type NSK bearing, including shaft ring (matched with journal), seat ring (matched with bearing seat) and a set of steel balls and cage. During installation, it can be easily matched with the journal and the bearing seat.

Thrust ball bearings have one-way thrust ball bearings, two-way thrust ball bearings, and angular contact thrust ball bearings according to their different structures.

1. One-way thrust ball bearing

One-way thrust ball bearings can bear axial load in one direction, but cannot bear radial load, and can do axial positioning in one direction. One-way thrust ball bearings are divided into flat races and self-aligning races. Generally, the angle error of the flat seat ring is not allowed, but when designing the bearing, a gap of 0.5~1mm can be left between the outer diameter of the seat ring and the mating surface of the bearing seat for compensation, or a thrust ball bearing with a self-aligning seat can be used for compensation. Angle error in installation. But the self-aligning seat needs to be ordered separately.

2. Two-way thrust ball bearing

Two-way thrust ball bearings can bear axial load in two directions, but cannot bear radial load, and can do axial positioning in two directions. Two-way thrust ball bearings are also divided into flat races and self-aligning races. Generally, the angle error of the flat seat ring is not allowed, but in the bearing design, a gap of 0.5 to 1 mm can be left between the outer diameter of the seat ring and the mating surface of the bearing seat for compensation. It is also possible to use a thrust ball bearing with a self-aligning seat to compensate for the angular error in the installation. But the self-aligning seat needs to be ordered separately.

3. Angular contact thrust ball bearings

Angular contact thrust ball bearings mainly bear axial load, but can also bear a small amount of radial load. Compared with thrust ball bearings of the same size, angular contact thrust ball bearings allow a higher limit speed and can perform unidirectional axial positioning. Angular contact thrust ball bearings have two contact angles of 45° and 60°. They are especially suitable for use in applications where the axial load is the main component and there is a certain radial load. It can also be used to compensate for flat thrust ball bearings. The insufficiency of being able to bear axial load but not radial load. The size of the radial load that the structure can bear depends on the size of the contact angle. Generally speaking, the smaller the contact angle, the greater its ability to bear the radial load.

4. Thrust ball bearing with outer cover

The structure of the thrust ball bearing with outer cover is basically the same as that of the one-way thrust ball bearing. But with an outer cover on the seat ring (or cover on both the inner and outer diameters of the seat ring). Because of the outer cover, the thrust ball bearing with the outer cover becomes an inseparable bearing, and the outer cover is dustproof. Thrust ball bearings with outer cover can bear axial load in one direction, but cannot bear radial load, and can do axial positioning in one direction.

The cages of thrust ball bearings generally use steel stamping cages, and there are also car-made steel, brass solid cages, and engineering plastic cages such as glass fiber reinforced nylon 66.

In order to ensure a good running state of the bearing, thrust ball bearings, like other ball bearings and roller bearings, must be applied with a certain amount of small load, especially for high speed, high acceleration, or frequent changes in the load direction. . Because of these working conditions, the inertial force of the ball and the cage and the friction in the lubricant will adversely affect the rolling and rotation accuracy of the bearing, and there may be harmful sliding motion between the ball and the raceway.

In the case of starting at low temperature or high lubricant viscosity, a larger and smaller load may be required. Under normal circumstances, the weight of the bearing support itself plus the load borne by the bearing has exceeded the required small load. If the small load has not been reached, the bearing of this structure must be subjected to additional axial load to meet the requirements of the small load. In the application of thrust ball bearings, springs can generally be used to apply axial preload.