CUSCINETTI SPECIALI

SPECIAL BEARINGS

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Angular contact ball bearings (one row)

The axis of the outer ring and inner ring tracks is displaced between them: this characteristic determines points of contact between the tracks that form a certain angle of contact, precisely oblique, determined in relation to the type and value of the load and rigidity that you want to get. These bearings absorb axial loads in one direction only and for this reason they are mounted coupled with each other, according to certain specular arrangements that vary their behaviour. They cannot be dismantled and have massive rings and balls with cages in different materials, determined by the type of application. The preferred bearings are the series with higher precision dimensional and geometric tolerance classes, which are suitable for operating conditions that require driving precision and high speeds, particularly suitable for application in the main spindles of machine tools.


Angular contact ball bearings can carry axial loads acting in one direction only.
Under the effect of a radial load, an axial force is generated in each of them that must be balanced: therefore they are generally mounted in opposition.
In the tandem arrangement the load lines are parallel and the radial and axial loads are distributed equally between the bearings.
The load lines of the bearings arranged “O” diverge towards the axis and axial loads can be supported in both directions, but obviously with only one bearing.
With this arrangement, a relatively rigid arrangement is obtained, capable of withstanding even tilting moments.
The load lines in the bearings arranged “X” converge towards the axis and, here too, axial loads can be supported in both directions, but with only one bearing.
With this arrangement, a less rigid arrangement than the previous one is obtained and less suitable for supporting tilting moments.
Angular contact ball bearings with a single row normally have a high side edge and a low one on the same ring’s race.
The low side edge allow the insertion of a larger number of balls, which implies the advantage of a relatively high load capacity.


Dimensions

The overall dimensions of the standard bearings (identified by a standard name and not by a drawing number) are according to ISO 15-1981.


Tolerances

Single row angular contact ball bearings in the normal design for single mounting are usually manufactured with normal tolerances.
Some are also available with higher precision according to classes P6 and P5.
The tolerance values ​​of normal class, P6 and P5 classes , are according to ISO 492-1986 and are shown in the tables on page 92-93.


Clearance

With angular contact ball bearing we can talk about clearance only after its assembly in opposition to another; the clearance’ value depends on the chosen registration.


Misalignment

Angular contact ball bearings have a limited ability to tolerate alignment mistakes of the inner ring with with the outer ring, the consequent problems are as complex as those of radial ball bearings.
In case of matched bearings, especially with the “O” arrangement, the angular misalignment involves additional stresses between balls and grooves and on the cages and therefore a reduction in life duration.
The misalignment also causes silence reduction.

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