The solutions presented in the paper are based on the possibility to obtain stacked bearings by mounting two bearings if the outer diameter of one corresponds to the inner diameter of the second. Another variant is to specifically design an inner ring with two raceways, one for the lower bearing and the other one for the upper bearing. The paper presents solutions of this type by using bearings of the same type (homogeneous). Regardless of the chosen variant, the final solution presents two layers of rolling bodies or, in other words, a single intermediate ring. The construction of nested bearings must primarily take into consideration the balancing of the static and dynamic basic load rating ensured by the two layers of rolling bodies. This objective can be achieved by adequately establishing the radius and number of balls in the two layers. The advantage of such a construction is that it allows obtaining high rotational speeds. From a theoretical point of view, one can conclude that the maximum speed results as the sum of the values for the two bearings.
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