Single-row and double-row angular contact ball bearings

Angular contact ball bearings are composed of an outer ring, an inner ring, a steel ball, and a cage. It can bear both radial and axial loads, and can also bear pure axial loads, and can work stably at high speeds. Single-row angular contact ball bearings can only withstand axial loads in one direction. When this kind of bearing bears pure radial load, because the rolling element load line and the radial load line are not in the same radial plane, the internal axial component is generated, so it must be installed in pairs.

 

1. Single-row angular contact ball bearings

Single-row angular contact ball bearings have the following structural forms:

(1) Separable angular contact ball bearings

The outer raceway side of this type of bearing has no locking opening, which can be separated from the inner ring, cage and ball assembly, so that it can be installed separately. This kind of miniature bearings with an inner diameter of less than 10mm are mostly used in gyrocopic rotors, micromotors and other devices that have high requirements for dynamic balance, noise, vibration and stability.

 

(2) Non-separable angular contact ball bearings

The ring groove of this type of bearing has a lock opening, so the two rings cannot be separated. There are three types according to the contact angle:

(1) Contact angle α=40°, suitable for bearing large axial load;

(2) Contact angle α=25°, mostly used for precision spindle bearings;

(3) Contact angle α=15°, mostly used for large-size precision bearings.

(3) Angular contact ball bearings arranged in pairs

 

Angular contact ball bearings arranged in pairs are used to accommodate both radial and axial loads, as well as pure radial loads and axial loads in either direction. This kind of bearing is selected and combined into pairs by the manufacturer according to certain preload requirements, and is provided to users. When the bearing is mounted on the machine and tightened, the clearance in the bearing is completely eliminated, and the ring and ball are in a preloaded state, thus improving the rigidity of the combined bearing.

 

Angular contact ball bearings arranged in pairs are available in three different configurations:

(1) Back-to-back configuration, post-code DB, this configuration has good rigidity, good performance to withstand overturning moment, and the bearing can bear two-way axial load;

 

(2) Face-to-face configuration, the rear code is DF, the rigidity of this configuration and the ability to withstand the overturning moment are not as good as the DB configuration form, and the bearing can bear two-way axial load;

 

(3) Tandem arrangement, post-code DT, this configuration can also be connected in series with three or more bearings at the same support, but can only bear the axial load in one direction. Typically, in order to balance and limit the axial displacement of the shaft, a bearing capable of bearing the axial load in the other direction is installed at the other support.

 

2. Double row angular contact ball bearings

Double row angular contact ball bearings are characterized by the ability to withstand a combined load of radial and axial loads at the same time, limiting the axial displacement of both sides of the shaft.

Compared with the two-way thrust ball bearing, this kind of bearing has a higher ultimate speed, a contact angle of 32°, good rigidity, and can withstand a large overturning moment, and is widely used in the front wheel hub of a car (some models also use double row tapered roller bearings of the same size).

 

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

(1) The standard design of Type A bearings with an outer diameter of less than or equal to 90mm. There is no ball notch, so it can withstand equal axial loads in both directions. The lightweight glass fiber reinforced nylon 66 cage is adopted, and the temperature rise of the bearing is very small.

(2) Standard design for Type A bearings with an outer diameter greater than 90mm. There is a loading notch on one side and is equipped with a steel plate stamped cage or a brass solid cage.

(3) Type E is a reinforced structure, with a ball notch on one side, which can hold more steel balls, so the bearing capacity is higher.

 

(4) Double row angular contact ball bearings with dust cap on both sides and seal ring type A type and E type design can be equipped with dust cap (non-contact type) or sealing ring (contact type) on both sides. The inside of the sealed bearings is filled with anti-rust lithium grease, and the operating temperature is generally -30~+110°C. No relubrication is required during use, and it should not be heated or cleaned before installation.

 

When installing double row angular contact ball bearings, care should be taken that although the bearing can withstand bidirectional axial loads, if there is a ball notch on one side, care should be taken not to allow the main axial load to pass through the groove on the notched side.

 

If you want to know more bearing information,please contact us :

sales@cwlbearing.com

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