ANGULAR CONTACT BALL BEARINGS
Single Row Angular Contact Ball Bearings
Single Row Angular Contact Ball Bearings are designed so that the connecting line of the raceway-to-ball contact points are positioned at an acute angle to the perpendicular line of the bearing axis or contact angle. Since this allows them to stand up to radial loads acting simultaneously with high axial forces in one direction, they are usually arranged back-to-back in pairs to accommodate axial loading in both directions.
Optimum ball size and conformity give these bearings high load ratings. Although they have only a single rib on the bearing rings, single row angular contact bearings are non-separable.Bearings with the designation B and BE have a contact angle of α=40°. Other designations such as AA with a contact angle of α=26°, and A with a contact angle of α=25°, are also produced Single row angular contact bearings, type A70 and A72 or B70 and B72, are designed for high rotational speeds.They are different in internal design from the standard angular contact bearings.
These bearings have designations CB (contact angle α =10°) and CA. Often these bearings are produced with a higher tolerance class, P4 or P4A. Bearings with the C designation have a design with a contact angle of α =15° and are often produced in a tolerance class P5 or P5A and P4 or P4A. These bearings, type A70 and A72 or B70 and B72, are predominately used in machine tool spindles and similar applications.
Double Row Angular Contact Ball Bearings
We Double Row Angular Contact Ball Bearings correspond, in principle, to two single row angular contact ball bearings in the back-to-back arrangement; however, there is a narrower profile for the same bearing size. The connecting line of the raceway-to-ball contact points intersects the bearing axis outside the bearing at a contact angle of α =32 °.
These bearings are produced with a filling slot on one side to achieve maximum load ratings. If axial forces act predominately in one direction, the bearing must be mounted so that these forces do not push against its filling slot.