Frictional rotary connection

A rotary connecting means based on frictional engagement, comprising:

• a hollow shaft (2) to be placed on a shaft, and a tapered ring (3) placed on the hollow shaft (2) and including at least one tapered ring section (4a) having an inner surface abutting the hollow shaft (2), and having an oblique outer surface (5a);
• at least one tensioning ring element (6a) placed on the tapered ring (3) and having an oblique inner surface, wherein the tensioning ring element (6a) slides between a starting position and a tensioning position along the oblique outer surface (5a) of the tapered ring section (4a);
• and
• tensioning means comprising a pressure ring chamber (15) and an annular piston (7) within the pressure chamber (15) for moving the tensioning ring element (6a) into the tensioning position, wherein:
• in addition to the tensioning means there is provided at least one separate retaining element (8) for securing the tensioning ring element (6a) in the tensioning position, which retaining element (8) is arranged to move and be guided in a radial direction with respect to the hollow shaft (2), independent of the tensioning means, from a free position into a clamping position in which the retaining element (8) axially blocks the tensioning ring element (6a) in the tensioning position, wherein the piston (7) defines a receptacle (16) for the retaining element (8) in the free position and a guide (17a, 17b) for the retaining element (8) during movement of the retaining element (8).