The connection line between the steel ball of the contact ball bearing and the contact point of the inner and outer rings forms an angle with the radial direction. Contact angles are generally divided into 15°, 30°, and 40°, which are represented by letters C, A, and B respectively. NSK specially produces such bearings with a contact angle of 25°.
Angular contact ball bearings mainly bear large unidirectional axial loads. The larger the contact angle, the greater the load bearing capacity. The material of the cage is steel plate, brass or engineering plastic, and the forming method is stamping or turning, which is selected according to the bearing form or service conditions. Others include combined angular contact ball bearings, double row angular contact ball bearings and four-point contact ball bearings.
Angular contact ball bearings can bear radial load and axial load at the same time. Can work at higher speeds. The larger the contact angle, the higher the axial load carrying capacity. High-precision and high-speed bearings usually take a contact angle of 15 degrees. Under the action of axial force, the contact angle will increase. Single row angular contact ball bearings can only bear axial load in one direction, and will cause additional axial force when bearing radial load. And it can only limit the axial displacement of the shaft or housing in one direction. If it is installed in pairs, make the outer rings of a pair of bearings face each other, that is, the wide end faces the wide end face, and the narrow end faces the narrow end face. This avoids causing additional axial forces and keeps the shaft or housing within axial play in both directions.
Because the raceway of the inner and outer rings of the angular contact ball bearing can have relative displacement on the horizontal axis, it can bear radial load and axial load at the same time - combined load (single row angular contact ball bearing can only bear axial load in one direction, Therefore, they are generally installed in pairs). The material of the cage is brass, synthetic resin, etc., which are distinguished according to the bearing type and service conditions.
Type 7000C (∝=15°), Type 7000AC (∝=25°) and Type 7000B (∝=40°) The lock of this type of bearing is on the outer ring. Generally, the inner and outer rings cannot be separated and can withstand radial and axial combined loads and axial loads in one direction. The ability to bear axial load is determined by the contact angle, and the larger the contact angle, the higher the ability to bear axial load. This kind of bearing can limit the axial displacement of the shaft or housing in one direction.
1. Single column: 78XX, 79XX, 70XX, 72XX, 73XX, 74XX
2. Micro: 70X
3. double row: 52XX, 53XX, 32XX, 33XX, LD57, LD58
4. four-point contact: QJ2XX, QJ3XX