The characteristic of angular contact ball bearings is that they can bear both radial loads and unidirectional axial loads. The larger the contact angle, the greater the axial load, and the smaller the contact angle, the smaller the axial load. Conversely, the smaller the contact angle, the greater the ability to bear radial loads, and the more suitable it is for high-speed applications. According to different working conditions, it can have a variety of assembly methods to obtain different radial and axial load bearing capacities, and meet the requirements of high speed and high radial and axial stiffness. Therefore, it is widely used in the spindles of precision machine tools.
Next, let's take a look at the six forms of angular contact ball bearing pairing!
1. Back to back configuration, with the Suffix code DB (such as 71800/DB), the load lines of the back-to-back paired bearings are separated from the bearing shaft. It can withstand axial loads acting in two directions, but the load in each direction can only be borne by one bearing. The back-to-back installed bearings provide a relatively rigid bearing configuration and can withstand overturning moments.
2. Face to face configuration, with the suffix DF (such as 71800/DF), the load lines of the angular contact ball bearings paired face-to-face converge towards the bearing shaft. It can withstand axial loads acting in two directions, but the load in each direction can only be borne by one bearing. This configuration is not as rigid as back-to-back pairing and is not suitable for withstanding overturning moments. The rigidity and ability to withstand overturning moments of this configuration are not as good as the DB configuration form, and the bearings can withstand bidirectional axial loads.
3. Series configuration, with the suffix DT (such as 71800/DT). In series configuration, the load lines are parallel, and the radial and axial loads are evenly distributed by the bearings. However, the bearing assembly can only withstand axial loads acting in one direction. If the axial load is applied in the opposite direction, or if there is a composite load, a third bearing with relative series matching and bearing adjustment must be added. This configuration can also connect three or more bearings in series at the same support, but can only withstand unidirectional axial loads. Usually, in order to balance and limit the axial displacement of the shaft, a bearing that can withstand axial loads in the other direction needs to be installed at another support.
4. Triple configuration, with the suffix DBD (71800/DBD), can withstand radial loads and 2 axial loads when configured in triple configuration. However, the pre-tension force distribution of angular contact ball bearings is uneven,when rotating at high speed, the internal load borne by a single row bearing increases, which may cause damage to the bearing, so DBD is not suitable for high-speed rotation.
5. Four paired configuration, with the suffix code DBB (71800/DBD), can withstand radial loads and axial loads in two directions when configured with four links. In the same internal game scenario, its preload and stiffness are twice that of the DB configuration, and the maximum axial load it can withstand is also relatively large.
6. Universal configuration, later known code is SU, universal group supporting role contact ball bearing is the same height repair inside, outer ring non base surface strictly controls the final grinding plane size tolerance, so that the width of inner and outer rings is equal height. The method of universal assembly is to install it on precision machine tools without the need for complex adjustment processes, in order to obtain the required preload.
