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Angular contact ball bearing product features and classifications
Angular contact ball bearings are particularly suitable for bearing composite loads, that is, loads acting simultaneously in the radial and axial directions. The axial load bearing capacity increases with the increase of the contact angle α. The contact angle is defined as: the angle between the common normal of the contact point or the midpoint of the contact line between the rolling element and the raceway and the radial plane of the bearing is called the bearing contact angle. The load is transmitted from one raceway to another along this line. , for single-row bearings, the contact angle size can be identified by different code suffixes.
HRB bearings angular contact ball bearings are particularly suitable for bearing synthetic loads, that is, loads acting simultaneously in the radial and axial directions. The axial load bearing capacity increases with the increase of the contact angle α.
The contact angle is defined as: the angle between the common normal of the contact point or the midpoint of the contact line between the rolling element and the raceway and the radial plane of the bearing is called the bearing contact angle. The load is transmitted from one raceway to another along this line. , for single-row bearings, the contact angle size can be identified by different code suffixes.
Angular contact ball bearings produced include:
Single row angular contact ball bearings
Double row angular contact ball bearings
Four point contact ball bearings
Structural features of single row angular contact ball bearings
Single row angular contact ball bearings can only bear axial load acting in one direction. Under the action of radial load, an axial force will appear in the bearing, which needs to be adjusted with a reverse force. Therefore, this kind of bearing generally needs to be balanced by another bearing.
Single row angular contact ball bearings can contain more steel balls, giving the bearings a higher load-bearing capacity. There are three contact angles: 15°, 25°, and 40°, and the suffix codes are C, AC, and B respectively. Single row angular contact ball bearings include non-separable type and separable type. Non-separable bearings are divided into three series: standard, high-speed and higher speed according to different applications; the inner and outer rings of separable bearings can be installed separately and are only used in components with restricted installation positions such as magnetos. This type of bearing Also called magneto bearings.
The non-separable bearing cage uses an inner ring-guided fiber-reinforced phenolic resin cage as the standard structure and is not marked in the bearing code. When using other cages, indicate them with the corresponding suffix code:
TA: Outer ring guided fiber reinforced phenolic resin cage
TN: Reinforced nylon 66 molded cage
M: Brass machined cage
Separable bearings (i.e. magneto bearings) mainly use reinforced nylon 66 molded cages. If necessary, bearings with brass plate stamped cages can also be provided.
Bearings with reinforced nylon 66 molded cages are suitable for most applications and can operate normally at -30℃~120℃.
Single row angular contact ball bearing assembly and preload
According to the structural characteristics of single row angular contact ball bearings, this type of bearing is usually used in combination with two or more bearings of the same model. The matching methods usually include:
Back-to-back configuration (DB) : Two single-row angular contact ball bearings are installed back-to-back. The contact angle line spreads along the direction of the rotation axis. It can well bear the two-way axial load and has high rigidity and anti-overturning moment performance .
Face-to-face configuration (DF): Two single row angular contact ball bearings are installed face to face, and the contact angle lines converge towards the direction of the rotation axis. Although the rigidity is small, it can effectively increase the preload .
Tandem configuration (DT) : Two single row angular contact ball bearings are installed in series. The contact angle lines are in a parallel state and can evenly share the radial and axial loads. However, they usually only bear the axial load in a single direction. They are often used to install opposite ends of the machine. Balancing and limiting axial stability .
For bearings assembled in pairs or in multiples, a certain preload must be applied during installation. Choosing the appropriate preload can improve the rigidity of the spindle system, reduce the temperature rise, and improve the machining accuracy of the system. Bearing preload is divided into three levels: light (A), medium (B), and heavy (C). Users can choose according to the actual working conditions of the spindle system.
Single row angular contact ball bearings with a 40° contact angle (suffix B) are produced in two types according to different uses. One version is suitable for a configuration with only one bearing in each bearing position. Another type is suitable for configurations in which two or more bearings are installed adjacent to each other in any combination (universal pairing).
Bearings for universal matching, specially designed and manufactured to be installed adjacently in any manner and to achieve predetermined axial clearance and uniform load distribution without the use of adjusting shims or similar devices. The suffix for universal matched bearings is CB, where C means there is clearance, and B means the clearance value. Bearings with smaller or larger clearances are also available (suffixes CA and CC respectively). If it is a preloaded bearing, the light preload, medium preload and heavy preload are identified by the suffixes GA, GB and GC respectively (G stands for preload or negative clearance).
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