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In the mechanical industry, two or more angular contact ball bearings of the same type are commonly used in double and multi-connected bearings.
When the angular contact ball bearing is used in combination, a certain pre-deformation is generated between the bearing rolling body and the inner and outer ring raceways by applying a load to increase the rigidity of the bearing, improve the rotation accuracy of the shaft, reduce the vibration of the shaft, and extend the life of the shaft.
The service life of the bearing. So, what are the combinations of angular contact ball bearings? Assembly method and steps
1. Angular contact ball bearing assembly method
According to the different end faces of assembled bearings approaching each other under the action of preload, there are three arrangements and combinations of angular contact ball bearings assembled in pairs. Both back-to-back form, face-to-face form, tandem form.
1. Back-to-back form
Back-to-back paired angular contact ball bearings are also called O-type or DB combinations, and the load line of the bearing is separated from the bearing shaft. This configuration matches the wide end faces of the outer rings of the two bearings. It can bear the combined load of radial and axial loads acting simultaneously, and can also bear the action of bidirectional axial loads, but the load in each direction can only be controlled by one bearing. bear. Bearings mounted back-to-back provide a relatively rigid bearing arrangement that can withstand overturning moments. This kind of assembly method is often used in the field, and it is applicable to many places. The slurry discharge pump in the field adopts this kind of assembly method.
2. Face-to-face
The form of face-to-face paired angular contact ball bearings is also called X-type or DF combination. This configuration is that the narrow end faces of the outer rings of the two bearings match, and the load lines of the bearings converge toward the bearing shaft, which can withstand two upward axial loads. , but the load in each direction can only be borne by one bearing, and the system stiffness is low. This configuration is not as rigid as a back-to-back pair and is less suitable to withstand overturning moments.
3. Series form
The angular contact ball bearings paired in series is also called T-type or DT combination. This configuration is that the wide end faces of the outer rings of the two bearings match the narrow end faces, the load lines of the bearings are parallel, and the radial and axial loads are evenly shared by the bearings. , but the bearing set can only bear axial load acting in one direction. If the axial loads act in the opposite direction, or if there are compound loads, it is necessary to add a third bearing adjusted relative to the tandem pair. This configuration can also connect three or more bearings in series at the same support, but it can only bear axial load in one direction. Usually, in order to balance and limit the axial displacement of the shaft, the other support needs to be installed with a bearing that can withstand the axial load in the other direction.
There are 6 types of angular contact ball bearing pairing forms as follows:
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1. Back-to-back configuration, the rear code is DB (such as 70000/DB), and the load line of the back-to-back paired bearings is separated from the bearing shaft. Axial loads acting in both directions can be accommodated, but loads in each direction can only be supported by one bearing. Bearings mounted back-to-back provide a relatively rigid bearing arrangement and can withstand overturning moments.
2. 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 to the bearing shaft. Axial loads acting in both directions can be accommodated, but loads in each direction can only be supported by one bearing. This configuration is not as rigid as a back-to-back pair and is less suited to withstand overturning moments. The rigidity of this configuration and the ability to withstand overturning moments are not as good as the DB configuration, and the bearings can withstand bidirectional axial loads.
3. Series configuration, the rear code is DT (such as 70000/DT). In series configuration, the load lines are parallel, and the radial and axial loads are evenly shared by the bearings. However, the bearing set can only accommodate axial loads acting in one direction. If the axial loads act in the opposite direction, or if there are compound loads, it is necessary to add a third bearing adjusted relative to the tandem pair. This configuration can also connect three or more bearings in series at the same support, but it can only bear axial load in one direction. Usually, in order to balance and limit the axial displacement of the shaft, a bearing capable of bearing axial load in the other direction needs to be installed at the other support.
4. Triple configuration, post code DBD (70000/DBD), when triple configuration, can bear radial load and 2 axial loads. However, the distribution of the preload of the bearing is uneven. When rotating at high speed, the inner sum of the single-row bearing increases, which may cause damage to the bearing, so DBD is not suitable for high-speed rotation.
5. Quadruple configuration, post code DBB (70000/DBD), when quadruple configuration, can bear radial load and axial load in two directions. In the case of the same inner structure, its preload and stiffness are twice that of the DB configuration, and the ultimate axial load it can withstand is also relatively large
6. Universal configuration, later known code-named SU, universal angular contact ball bearings are repaired at the same height, and the non-base surface of the outer ring is strictly controlled to the final grinding plane size tolerance, so that the width of the inner and outer rings is equal. The method of universal assembly is to install on the precision machine tool without complicated adjustment process, and the required preload can be obtained.
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