L&Y angular contact ball bearing product features and classification

What are angular contact ball bearings? What are the characteristics of L&Y bearing single-row angular contact ball bearings?

Angular contact ball bearings are particularly suitable for bearing composite loads, that is, loads acting radially and axially at the same time. 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 line of the rolling element and the contact point of the raceway or the midpoint of the contact line and the radial plane of the bearing is called the bearing contact angle. The load is transferred from one raceway to another along this line. For single-row bearings, the size of the contact angle can be identified by different code suffixes.

HRB bearing angular contact ball bearings are particularly suitable for bearing composite loads, that is, loads acting radially and axially at the same time. 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 line of the rolling element and the contact point of the raceway or the midpoint of the contact line and the radial plane of the bearing is called the bearing contact angle. The load is transferred from one raceway to another along this line. For single-row bearings, the size of the contact angle can be identified by different code suffixes.

The 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 withstand unidirectional axial loads. Under radial loads, an axial force will appear in the bearing, which needs to be adjusted by a reverse force. Therefore, this type of bearing generally needs to be balanced by another bearing.

Single-row angular contact ball bearings can be loaded with more steel balls, giving the bearings a higher load-bearing capacity. There are three types of contact angles: 15°, 25°, and 40°, with suffix codes C, AC, and B respectively. Single-row angular contact ball bearings include non-separable and separable types. Non-separable bearings are divided into three series: standard, high-speed, and high-speed according to different application scenarios; the inner and outer rings of separable bearings can be installed separately, and are only used in components with limited installation positions such as magnetic motors. This type of bearing is also called magnetic motor bearing.

The non-separable bearing cage uses the inner ring guided fiber reinforced phenolic resin cage as the standard structure, which is not marked in the bearing code. When other cages are used, the corresponding suffix codes are used:

TA: Outer ring guided fiber reinforced phenolic resin cage

TN: Reinforced nylon 66 injection molded cage

M: Brass machined cage

Separable bearings (i.e.: magneto bearings) mainly use reinforced nylon 66 injection molded cages. If necessary, bearings with brass plate stamped cages can also be provided.

Bearings with reinforced nylon 66 injection molded cages are suitable for most applications and can work 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 groups of two or more bearings of the same model. The assembly methods are usually:

Back-to-back configuration (DB)：Two single-row angular contact ball bearings are installed back to back, and the contact angle line spreads along the direction of the rotation axis. They can well withstand bidirectional axial loads and have 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 line converges toward 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, and the contact angle line is in a parallel state. They can evenly share the radial and axial loads, but usually only withstand axial loads in a single direction. They are often used for opposite installation at both ends of the machine to balance and limit axial stability.

Paired or multi-unit bearings must be applied with a certain preload during application and installation. Selecting an appropriate preload can improve the rigidity of the spindle system, reduce temperature rise, and improve the system processing accuracy. 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 contact angle of 40° (suffix B) are produced in two types according to different uses. One type is suitable for configurations where only one bearing is placed in each bearing position. The other type is suitable for configurations where two or more bearings are installed adjacent to each other in any combination (universal pairing).

Bearings for universal pairing are specially designed and manufactured to be installed adjacent to each other in any combination and to obtain a predetermined axial clearance and uniform load distribution without the use of adjustment washers or similar devices. The suffix for universal pairing bearings is CB, where C indicates clearance and B indicates the size of the clearance value. Bearings with smaller or larger clearances are also available (suffixes CA and CC, respectively). If they are preloaded bearings, light preload, medium preload and heavy preload are indicated by the suffixes GA, GB, GC, respectively (G represents preload or negative clearance). When ordering bearings for universal pairing, such as 7206BTNCB, the number of individual bearings required must be specified.