Abstract: A gearbox (70) has a pivot bearing (50) with an outer pivot bearing ring (1a) and an inner pivot bearing ring (1b). A filling groove (18) for rolling elements (16) is formed between the outer and inner pivot bearing rings. A tension shaft gear (40) with a central longitudinal axis (15) is mounted in the pivot bearing (50) and has a wave generator (10). An elastic flexspline (4) with an external gearing (3) and a circular spline (6) has an internal gearing (5). The flexspline (4) can be elliptically deformed by the wave generator (10) so that the external gearing (3) of the flexspline (4) engages with the internal gearing (5) of the circular spline (6) in opposite regions of a large elliptical axis. The circular spline (6) has a securing element (20) which blocks axial movement of the rolling elements (16).

Abstract: A gearbox (70) has a pivot bearing (50) with an outer pivot bearing ring (1a) and an inner pivot bearing ring (1b). A filling groove (18) for rolling elements (16) is formed between the outer and inner pivot bearing rings. A tension shaft gear (40) with a central longitudinal axis (15) is mounted in the pivot bearing (50) and has a wave generator (10). An elastic flexspline (4) with an external gearing (3) and a circular spline (6) has an internal gearing (5). The flexspline (4) can be elliptically deformed by the wave generator (10) so that the external gearing (3) of the flexspline (4) engages with the internal gearing (5) of the circular spline (6) in opposite regions of a large elliptical axis. The circular spline (6) has a securing element (20) which blocks axial movement of the rolling elements (16).