Angular contact ball bearing installation skills

Angular contact ball bearings have raceways on the inner and outer rings, and the inner and outer rings can make relative displacements along the bearing axis. Bearings of this type are particularly suitable for combined loads, i.e. loads acting both radially and axially.

The axial load bearing capacity of angular contact ball bearings increases with the increase of the contact angle α. The contact angle is the angle between the line connecting the contact points of the ball and the raceway in the radial plane and the line perpendicular to the bearing axis. The models of angular contact ball bearings are divided into: angular contact ball bearings with α=15° (type 70000C); angular contact ball bearings with α=25° (type 70000AC); angular contact ball bearings with α=40° (type 70000B) ); back-to-back paired double angular contact ball bearings [70000C (AC, B)/DB type]; face-to-face paired double angular contact ball bearings [70000C (AC, B)/DF type]; series paired double angular contact Contact ball bearing [70000C (AC, B)/DT type];

Double row angular contact ball bearing with ball gap (type 00000); double row angular contact ball bearing without ball gap (00000A type); double row angular contact ball bearing without ball gap and with dust cover on one side ( 00000A-Z type); double row angular contact ball bearing without ball gap, with dust cover on both sides (00000A-2Z type); double row angular contact ball bearing with no ball gap, one side with sealing ring (00000ARS type) ); double-row angular contact ball bearings with no ball gap and sealing rings on both sides (type 00000A-2RS); four-point angular contact ball bearings (type QJ0000), totaling 13 types.

High-speed precision angular contact ball bearings are mainly used in high-speed rotation occasions with light loads, which require bearings with high precision, high speed, low temperature rise and low vibration and a certain service life. It is often used as a support for high-speed motorized spindles installed in pairs, and is a key accessory for high-speed motorized spindles of internal surface grinders. Angular contact ball bearing installation form The angular contact ball bearing quick and easy automatic selection can provide selection, and the installation form of angular contact ball bearings has three types: back-to-back, face-to-face and tandem arrangement. When installed back-to-back (the wide end faces of the two bearings are opposite to each other), the contact angle line of the bearing spreads along the direction of the rotation axis, which can increase the rigidity of its radial and axial support angles, and has the greatest resistance to deformation;

When installed face to face (the narrow end faces of the two bearings are opposite to each other), the contact angle line of the bearing converges towards the direction of the rotation axis, and its supporting angle is less rigid. Since the inner ring of the bearing extends out of the outer ring, when the outer rings of the two bearings are pressed together, the original clearance of the outer ring is eliminated, which can increase the preload of the bearing; when the two bearings are arranged in series (the wide end faces of the two bearings are in one direction) when installed , the contact angle lines of the bearing are in the same direction and parallel, so that the two bearings can share the working load in the same direction.

However, when using this type of installation, in order to ensure the axial stability of the installation, two pairs of bearings arranged in series must be installed opposite to each other at both ends of the shaft. Main technical indicators of angular contact ball bearings: 1. Bearing accuracy indicators: more than GB/307.1-94 P4 level accuracy 2. High-speed performance indicators: dmN value 1.3~1.8x 106 /min3. Service life (average);

The service life of the 1500 h high-speed precision angular contact ball bearing has a lot to do with the installation. The following items should be paid attention to: 1. The bearing installation should be carried out in a dust-free and clean room, the bearing should be carefully selected, and the bearing spacer should be ground , Under the premise of maintaining the same height of the inner and outer ring spacers, the parallelism of the spacer should be controlled below 1um; 2. The bearing should be cleaned before installation. When cleaning, the inner ring slope is upward, and the hand feels flexible without stagnation. Dry After that, put the specified amount of grease, if it is oil mist lubrication, put a small amount of oil mist oil; 3. The bearing installation should use special tools, the force should be uniform, and it is strictly forbidden to knock; 4. The bearing storage should be clean and ventilated, free of corrosive gas, The relative humidity does not exceed 65%, and long-term storage should be regularly rust-proof.