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Types of angular contact ball bearings

by:JNSN     2021-10-28

Angular contact ball bearings have several types: 7000C (∝u003d15°), 7000AC (∝u003d25°) and 7000B (∝u003d40°). The lock of this kind of bearing is on the outer ring. Generally, the inner and outer rings cannot be separated, and can bear the combined radial and axial load and the axial load in one direction. The ability to withstand the axial load is determined by the contact angle. The larger the contact angle, the higher the ability to withstand the axial load. This kind of bearing can limit the axial displacement of the shaft or housing in one direction.

The contact ball bearing has a high limit speed, which can bear radial load and axial load at the same time, and can also bear pure axial load. Its axial load capacity is determined by the contact angle and varies with The increase in contact angle increases.

Single row angular contact ball bearings

Single row angular contact ball bearings can only bear axial load in one direction. When bearing radial load, additional axial force will be caused and must be applied To the corresponding reverse load, therefore, this kind of bearings are generally used in pairs. Double row angular contact ball bearings can withstand large radial and axial bidirectional combined loads and moment loads, which are dominated by radial loads. It can limit the axial displacement of the shaft or housing in both directions, with a contact angle of 30 degrees.

Bearing code: 7

Angular contact ball bearings installed in pairs

Angular contact ball bearings installed in pairs can withstand radial loads that are dominated by radial loads , Axial and bidirectional combined load, can also bear pure radial load. The tandem configuration can only bear axial load in a single direction, and the other two configurations can bear axial load in either direction. This type of bearing is generally selected and combined by the manufacturer and submitted to the user in pairs. After installation, there is preload interference, and the ring and steel ball are in the axial preload state, thus increasing the rigidity and rotation of the entire group of bearings as a single support Accuracy.

Back-to-back configuration, the rear code is DB (such as 70000/DB), the load line of the back-to-back paired bearings is separated from the bearing shaft. It can bear the axial load acting in two directions, but the load in each direction can only be borne by one bearing. Bearings mounted back-to-back provide a relatively rigid bearing configuration and can withstand overturning moments.

Face-to-face configuration, the rear code is DF (such as 70000/DF), and the load lines of the face-to-face paired bearings converge toward the bearing shaft. It can bear the axial load acting in two directions, but the load in each direction can only be borne by one bearing. This configuration is not as rigid as the back-to-back pairing, and it is not suitable for withstanding overturning moments. The rigidity and the ability of bearing overturning moment of this configuration are not as good as the DB configuration, the bearing can bear bidirectional axial load; The load lines are parallel, and the radial and axial loads are evenly shared by the bearing. However, the bearing assembly can only bear axial loads acting in one direction. If the axial load acts in the opposite direction, or if there is a compound load, a third bearing adjusted relative to the tandem paired bearing must be added. This configuration can also be connected in series with three or more bearings at the same support, but it can only withstand unidirectional axial loads. Generally, in order to balance and limit the axial displacement of the shaft, another bearing needs to be installed with a bearing that can withstand the axial load in the other direction.

Bearing code: 0

Load capacity (abbreviated)

The following content is only for the load capacity of the matched bearing, and the basic load rating given in the product table And the fatigue limit load only applies to a single bearing.

*Basic dynamic load rating for standard bearings in any configuration and SKF Explorer bearings in back-to-back or face-to-face configuration

Cu003d1,62xC single bearing

*Basic dynamic load rating for SKF Explorer bearings in tandem configuration

Cu003d2xC single bearing

*Basic static load rating

Cou003d2xCo Single bearing

*Fatigue limit load

Puu003d2xPu single bearing

Types of structural deformation

Characteristics of double row angular contact ball bearings It can bear the combined load of radial and axial load at the same time, and limit the axial displacement of the shaft on both sides. Compared with the two-way thrust ball bearing, this kind of bearing has a higher limit speed, a contact angle of 32 degrees, good rigidity, and can withstand a large overturning moment. It is widely used in the front wheel hub of a car (some models also use the same size Double row tapered roller bearings).

There are four structural deformations of double-row angular contact ball bearings:

Type A: Standard design for bearings with an outer diameter less than or equal to 90mm. There is no notch for ball loading, so it can bear equal bidirectional axial load. Using light glass fiber reinforced nylon 66 cage, the bearing temperature rise is very small.

Type A: Standard design for bearings with an outer diameter greater than 90mm. There is a ball notch on one side, and it is equipped with a z-steel stamping cage or a brass solid cage.

Type E: It is a reinforced structure with a ball notch on one side, which can hold more steel balls, so it has a higher load-bearing capacity.

Double row angular contact ball bearings with dust cover on both sides and seal ring on both sides, A and E design, can be equipped with dust cover on both sides (non-contact type) or Sealing ring (contact type). The inside of the sealed bearing is filled with anti-rust lithium grease, and the operating temperature is generally between -30°C and 110°C. No relubrication is required during use and no heating before installation.

Pay attention to the installation of double row angular contact ball bearings. Although the bearing can bear bidirectional axial load, if there is a gap in one side of the ball, you should be careful not to let the main axial load pass through the gap. The side of the ditch.

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