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Knowledge Of Angular Contact Bearings

Time:2020.08.05  Source:Roller Bearings Suppliers

Knowledge Of Angular Contact Bearings


Angular contact ball bearing type 70,000 is composed of outer ring, inner ring, steel balls and cage. It can bear radial load and axial load at the same time, as well as pure axial load, and can work stably at higher speeds. Single row angular contact ball bearings can only bear axial load in one direction. When this type of bearing bears pure radial load, because the line of action of the rolling element load and the line of action of the radial load are not in the same radial plane, an internal axial component of force is generated, so it must be installed in pairs.


1. Single row angular contact ball bearings


     (1) Separate angular contact ball bearings


     The code name of this kind of bearing is S70000. There is no lock on the outer ring raceway, and it can be separated from the inner ring, cage and ball assembly, so it can be installed separately. These types of miniature bearings with inner diameters less than 10mm are used in gyroscope rotors, micro motors and other devices that have high requirements for dynamic balance, noise, vibration, and stability.


     (2) Non-separable angular contact ball bearings


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


①Contact angle α=40°, suitable for bearing larger axial load;


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


③The contact angle α=15°, which is mostly used for large-sized precision bearings.


     (3) Angular contact ball bearings arranged in pairs


     Angular contact ball bearings arranged in pairs are used to bear radial load and axial load at the same time, and can also bear pure radial load and axial load in any direction. This kind of bearing is selected and combined into pairs by the manufacturer according to a certain preload requirement and provided to users. When the bearing is installed and tightened on the machine, the clearance in the bearing is completely eliminated, and the ring and ball are in a pre-tightened state, thus improving the rigidity of the combined bearing.


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WSBC 20218-MB.jpg


There are three different configurations of angular contact ball bearings arranged in pairs:


①Back-to-back configuration, the rear code is DB (such as 70000/DB), this configuration has better rigidity, good performance of bearing overturning moment, and the bearing can bear bidirectional axial load;


②Face-to-face configuration, the rear code is DF (such as 70000/DF). The rigidity and ability of bearing overturning moment of this configuration is not as good as the DB configuration, and the bearing can bear bidirectional axial load;


③Tandem configuration, the post code is DT (such as 70000/DT), this configuration can also be connected in series with three or more bearings at the same support, but it can only withstand axial load in one direction. Generally, in order to balance and limit the axial displacement of the shaft, a bearing that can withstand the axial load in the other direction needs to be installed at the other support.


In addition, there is also a single row angular contact ball bearing that can be matched at will. This kind of bearing has been specially processed and can be combined in any manner such as two back-to-back, two face-to-face or two in series. The axial clearance of the paired combination can be selected according to the needs. The post code CA indicates that the axial clearance is small, and CB indicates the axial direction. The clearance is moderate, CC means that the axial clearance is large.


     Universal matching bearings can also be configured into bearings with pre-interference according to the requirements of use, and are indicated by the postcodes GA, GB, and GC. GA indicates a small pre-interference after pairing; GB indicates a medium pre-interference after pairing; GC indicates a larger pre-interference after pairing.


2. Double row angular contact ball bearings


     The characteristic of double row angular contact ball bearings is that they can simultaneously bear the combined load of radial and axial loads and limit the axial displacement of the shaft on both sides.


Compared with two-way thrust ball bearings, this kind of bearing has a higher limit speed, a contact angle of 32°, 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 variants of double row angular contact ball bearings:


     (1) The standard design of Type A 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. Lightweight glass fiber reinforced nylon 66 cage is adopted, and the temperature rise of the bearing is small.


     (2) The standard design of Type A bearings with an outer diameter greater than 90mm. There is a notch for ball loading on one side, equipped with a steel stamping 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 load capacity is higher.


     (4) The 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 (non-contact) or sealing ring (contact type) on both sides. ). The inside of the sealed bearing is filled with anti-rust lithium grease, and the operating temperature is generally -30~+110℃. No relubrication is required during use, and it should not be heated or cleaned before installation.WSBC Bearing 20220-MB online, contact us if you have any need.


WSBC 20220-MB.jpg


     Pay attention to the installation of double row angular contact ball bearings. Although the bearing can withstand two-way axial loads, if there is a ball gap on one side, care should be taken not to allow the main axial load to pass through the gap on the side of the groove.


     Wuxi Spark Bearing Co.,Ltd has more than ten years of experience in bearing export, the quality of the products is very good, and the price also has a great advantage. After so many years of opening up a vast market, customers in more than 70 countries and regions around the world have established long-term cooperative relations with us.

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