Abstract: Radiaxial bearing having a cylindrical configuration centered on a central axis, the bearing having at least one harmonic wave-type reduction stage and including three or more rings and a first ring-shaped arrangement of rolling elements, each being centered on the central axis, the three or more rings enclosing the ring-shaped arrangement of rolling elements such that a) an innermost of the rings has a race in contact with the rolling elements from radially inward, an outermost of the rings has a race in contact with the rolling elements from radially outward, and a third ring, and possibly a fourth ring, has or have a race or races in contact with the rolling elements axially from both sides, or b) the three or more rings have four races contacting the rolling elements in a rectangular box formation, the box formation being oriented at an oblique angle with respect to the central axis of between 0° and 360°, wherein two opposed races have structures with different spatial frequencies that are designed to fo

Abstract: A reduction bearing in a ring-shaped configuration having a central axis of rotational symmetry including an inner ring, a center ring and an outer ring, said rings being concentric around the axis of rotational symmetry and an electric motor. The reduction bearing further includes a first ring of rolling elements and a second ring of rolling elements, the two rings of rolling elements being centered around the axis of rotational symmetry and located between the inner ring and the outer ring. The inner ring and the outer ring are configured as having bearing races for both of the two rings of rolling elements in a radial direction. The reduction bearing is configured to transmit a wave-type reduction action between the center ring and either the inner ring or the outer ring via axial displacement of the rolling elements of at least one of the two rings of rolling elements.

Abstract: Reduction bearing having at least three concentric rings that include an inner ring with inner ring axial extension, a center ring with center ring axial extension and an outer ring with outer ring axial extension and at least two concentric rings of/with rolling elements including an inner concentric ring of/with rolling elements and an outer concentric ring of/with rolling elements. Inner ring and center ring are configured as bearing races for inner concentric ring of/with rolling elements and center ring and outer ring are configured as bearing races for the outer concentric ring of/with rolling elements. At least one reduction stage has a common reduction stage plane in which the inner ring extension, the center ring extension and the outer ring extension lie. The center ring extension is configured to transmit a wave-type reduction action between the inner ring extension and the outer ring extension.