Angular Contact Ball Bearings
A single row angular contact ball bearing is composed of an outer ring, an inner ring, a row of steel balls and a cage.
This kind of bearing can bear radial load and axial load at the same time, also can bear pure axial load, and can work at high speed.
Single row angular contact ball bearings can only bear axial load in one direction.
When subjected to radial loads, additional axial forces will be imposed and only axial displacement of the shaft and housing in one direction can be limited.
Although this type of bearing can only withstand unidirectional axial loads, but can be combined with another bearing bearing in the opposite direction.
If installed in pairs, the outer rings of a pair of bearings are opposite to each other with the same end face, with the wide end facing the wide end face (back to back DB) and the narrow end facing the narrow end face (face to face DF). In this way, additional axial forces can be avoided and the shaft or housing can be limited within the axial clearance range in both directions.
Single row angular contact ball bearing loaded more ball than the same size deep groove ball bearing, so the rated load in the ball bearing is the largest, strong rigidity, smooth operation.
The radial clearance can be adjusted by the displacement of inner and outer rings, and the preinterference can be caused by several sets of bearings in parallel to improve the rigidity of the system.
Angular contact ball bearings are not separable, and their self-aligning ability is very limited.
The characteristic of this type of bearing is that the contact Angle is not zero. The standard contact Angle of single-row angular contact ball bearing is 15°, 25°, 30° and 40°.
The size of the contact Angle determines the radial force and axial force the bearing can bear. The larger the contact Angle is, the larger the axial load capacity is.
But the smaller the contact Angle is, the more favorable it is for high-speed rotation.
Single row angular contact ball bearings themselves do not have clearance.
Only angular contact ball bearings after assembly have internal clearance.
According to the requirements of working conditions, the combined bearing is divided into two ways: pre-load (pre-load) and pre-clearance (pre-clearance).
The internal clearance of the supporting contact ball bearing in the pre-load group is 0 or negative.
It is often used on machine tool spindle to improve spindle rigidity and rotation accuracy.
The clearance (pre-load) of the ball bearing with diagonal contact has been adjusted before delivery without user adjustment.
Common single row angular contact ball bearing main width tolerances and end surface protrusions are only produced according to ordinary grade, can not be randomly paired and combined.
The production of universal supporting contact ball bearings can be used back-to-back, face to face or series in any way.
Universal matching bearings are provided in two ways: pre-load (pre-load) and pre-clearance (pre-clearance).
In addition to the universal matching bearing, the single bearing in other matching bearings does not have interchangeability.
This kind of bearing is mainly used in high speed, high precision and small axial load.
Examples include aircraft engine spindles, machine tool spindles, and other high-speed precision mechanical spindles.
It is also used in high frequency motors, gas turbines, oil pumps, air compressors, printing machines, etc.
It is the most widely used bearing in the mechanical industry.
Angular contact ball bearings can be roughly divided into four types:
Single row angular contact ball bearing
7000C, 7000AC, 7000A, 7000B
Group of supporting players contact ball bearings
Face to face (DB), back to back (DF), tandem (DT), triple
Double row angular contact ball bearing
Double raceway inner ring and two single raceway outer ring combination
Double raceway outer ring and two single raceway inner ring combination
Double raceway outer ring and double raceway inner ring combination
Four point contact ball bearing
Single row angular contact ball bearing and group supporting contact ball bearing
In order to improve the rigidity and bearing capacity of angular contact ball bearings, angular contact ball bearings of the same specifications are often arranged in the ways of double (DB, DF, DT), triple (TBT, TFT, TT), quadruple (QBC, QFC, QT) or even five (PBC, PFC, PT, PBT, PFT).
For double angular contact ball bearings, there are three matching modes: back-to-back (DB), face-to-face (DF), and series (DT).
Back-to-back supporting contact ball bearings are designed to withstand single or combined radial and axial loads and can withstand bi-directional axial loads.
It can bear large overturning moment and has strong rigidity.
Different preloads can be applied according to the operating conditions.
Angular contact ball bearings arranged face to face bear less overturning torque and provide lower system stiffness.
Its advantage lies in its