BALL BEARINGS OBLIQUE CONTACT
The single row angular contact deep groove ball bearings can carry axial load in only one direction. Under the effect of a radial load, is generated in each of them, an axial force, that must be balanced: therefore are generally assembled in opposition. In the tandem arrangement, the load lines are parallel and radial and axial loads are distributed equally between the bearings. The load lines of “O” arranged bearings diverge towards the axis and can support axial loads in both directions, but of course with a single bearing. With this arrangement is obtained a relatively rigid placing that is able to withstand also the overturning moments. The load lines in the bearings arranged in an “X” converge towards the axis and, even here, you can support axial loads in both directions, but only one bearing. With this arrangement we obtain a less rigid arrangement of the previous and less suitable to withstand the overturning loads. Normally this bearings, have, on the same ring, a shoulder high and one low. The lower shoulder allow to introduce a large number of balls, which brings with it the advantage of a relatively high load capacity.
The overall dimensions of the standard bearings (identified by a standard name and not by a drawing number) are in accordance with ISO 15-1981.
The single row angular contact deep groove ball bearings of normal execution for single assembly, are built with normal tolerances. Some are also available with greater precision according to the classes P6 and P5. The values of tolerance of class normal, P6 and P5, are in accordance with ISO 492-1986 and are shown in the tables on pag. 24-25-26.
Clearances In the case of a single row angular contact deep groove ball bearings, we can talk about clearances only after assembling it in opposition with one another and the value of this clearances depends on the recording made.
This bearings, have a limited ability to tolerate misalignment of the inner ring from the outside world and the problems in this regard are as complex as those of single row radial bearings. In the case of matched bearing, especially with the “O” disposition, the angular misalignment involves additional efforts between the balls and grooves and on cages and therefore a reduction in duration. The misalignment also brings a significant reduction in silence.