Joint bearing classification

The joint bearing is divided into the direction of the load, the nominal contact angle and the structural type: the radial joint bearing, the angular contact joint bearing, the thrust joint bearing, the rod end joint bearing. Xiao Bian believes that this is a relatively basic classification method, and other classification methods are as follows:

First, according to the direction of the load or the nominal contact angle

1. Radial spherical plain bearings - used to withstand radial loads. The nominal contact angle is from 0 to 45 degrees. According to their nominal contact angles, they can be divided into:

a. Radial contact radial spherical plain bearing - a radial spherical plain bearing with a nominal contact angle of 0 degrees, suitable for bearing radial loads. However, it can withstand radial loads while withstanding a small axial load.

b. Angular contact radial joint bearing—A radial joint bearing with a nominal contact angle greater than 0 degrees but less than or equal to 45 degrees can withstand the combined load of radial load and axial load.

2, thrust joint bearing - for bearing axial load, its nominal contact angle is greater than 45 degrees to 90 degrees, according to the nominal contact angle, can be divided into:

a. Axial contact thrust joint bearing - a thrust joint bearing with a nominal contact angle of 90 degrees, suitable for bearing pure axial load.

b. Angular contact thrust joint bearing—A thrust joint bearing with a nominal contact angle greater than 45 degrees but less than 90 degrees is suitable for bearing axial loads, but can also withstand combined loads (at this time, the radial load value must not exceed the axial load) 0.5 times).

Second, according to the outer ring structure classification

1. The overall outer ring joint bearing;

2, double semi-outer ring joint bearing;

3. Single-slit outer ring joint bearing;

4, double seam outer ring (split outer ring) joint bearing.

Third, according to whether the rod end is attached or attached to the rod end

1. General joint bearing;

2. Rod end joint bearings.

4. Whether to add lubricant classification according to work

1. Non-self-lubricating joint bearings;

2. Self-lubricating joint bearings.
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Motor bearing

The cause of the rust of the motor bearing is very complicated. It may be that the bearing is not rust-proof, it may be caused by moisture, and the paint mist may cause rust. It has a close relationship with the type of insulating varnish, the pre-filled grease of the bearing, the treatment method of the motor lacquer and the storage environment of the motor.

To prevent paint rust, the rust prevention capability of the bearing itself must first be improved. The material of the bearing is generally bearing steel. The method of anti-rust treatment generally adopts the anti-rust oil inside the bearing. After the anti-rust treatment, the motor factory adds the grease by itself. However, if the rust preventive oil is applied too thick, it will cause a decrease in lubrication performance. Although paying attention to improving the rust resistance of the grease has certain effects, the most effective method is to change the composition of the paint.

Since the paint will produce harmful acid gases, it will of course cause the bearings to rust. The specific solution is:

1. Try to use solvent-free paint.

2. If possible, use an impregnating lacquer that does not contain oxidizing components, such as epoxy urethane or undenatured epoxy immersion lacquer.

3. When using melamine acid impregnating varnish, the curing temperature and curing time should be adjusted. The curing temperature is slightly higher than 130 °C (such as 135 °C) and the curing time is more than 180 min, and the process must be strictly performed, especially at high temperature. In the wet season, because of the concept of rust prevention, the drying (curing) time of the paint specified in the paint factory sample is not necessarily sufficient, and the motor has a specific inner shape.

4. Use a paint that does not contain volatile acids.


5. Choose a paint that is resistant to hydrolysis.

6, try to use mineral oil bearing grease.

7. When the motor factory injects grease by itself, in order to avoid noise and possible rusting of water vapor and dust entering the bearing in the air, the grease container should be sealed, even in the case of grease injection. The amount of grease should be determined according to the standard. For example, when the 6202 bearing is used, the reference value is in the range of 0.60 to 0.80g, and the grease filling process should be kept clean and dry.

8. Use a plastic film package with micropores to make the motor breathable before it is activated. When the package is sealed with a plastic film, the paint gas will remain in the bearing and the water will condense and should be avoided.

9. Grease may deteriorate under the influence of high temperature when the motor cover is sprayed or painted.

10. Consult with the bearing manufacturer to use a more effective rust inhibitor when the bearing is produced.

11. In order to completely solve the paint rust, it can be considered by the motor manufacturer, the bearing production plant and the paint production unit to jointly discuss various aspects of the ability to solve the corrosion of the bearing.
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