Torque limiting coupling

A torque limiting coupling, comprising:

• a first shaft;
• a second shaft configured as a hollow shaft;
• and
• a coupling ring having a coupling sleeve with an inner surface and an outer surface, said coupling sleeve disposed in a radial direction between said first shaft and said second shaft, such that said inner surface is in frictional contact with said first shaft and said outer surface is in frictional contact with said second shaft, said coupling sleeve being double-walled with an internal annular pressure oil chamber configured such that said coupling sleeve increases its radial thickness when said internal annular pressure oil chamber is filled with pressurized oil and thereby increases pressure forces and thereby friction between said inner and outer surfaces and said first and second shafts in order to allow a torque transfer between said first and second shafts, and said coupling sleeve transfers no torque, when said oil chamber is not filled with said pressurized oil, wherein said outer surface of said coupling sleeve which is in contact with said second shaft is of conical shape and said second shaft has a corresponding conical inner surface.