Abstract: A coupling arrangement (1) with a first clamping ring (10) concentric to the axis of rotation (1a), a second clamping ring (20) oriented concentrically with the axis of rotation and grooved around its circumference, and with clamping bodies (30) oriented radially between the clamping rings (10, 20); which includes on at least one of the clamping rings projections (11) that are built into a shape like a ramp (10, 20), each of which is placed between two neighboring clamping bodies; and which includes a first retainer (15) and a second retainer (25), with which the clamping rings (10, 20) and the clamps (30) are held together.

Abstract: An idler gear (7) is mounted in a variable speed gear transmission (1) on a rolling bearing crown ring (10) whose first and second rolling elements (12, 20) are guided in a cage (11) and have different diameters. The first and second rolling elements (12, 20) are of a same type, size ratios between the first and second rolling elements are defined so that, in an unloaded state, the larger diameter of the second rolling elements (20) is such as to become equal to a diameter of the first rolling elements (12) in an engaged state under radial loading, whereby a limit of elasticity of the second rolling elements (20) having the larger diameter in the unloaded state is not exceeded.