Tool coupling between two coupling parts, and coupling part for such a tool coupling

A cutting head for a rotary tool, wherein the cutting head extends in an axial direction and has a predefined direction of rotation about an axis of rotation, the cutting head comprising:

• a clamping pin having a pair of clamping sections;
• the clamping sections being disposed opposite one another at sides of the clamping pin;
• wherein each of the clamping sections comprises clamping surfaces;
• each of the clamping surfaces extends along and is shaped as a circular arc when viewed in cross section orthogonally to the axial direction;
• the clamping surfaces are arranged in at least two clamping surface pairs disposed opposite one another, with respect to the axis of rotation;
• for each of the at least two clamping surface pairs, the circular arcs of the clamping surfaces define a constant, predefined diameter as measured through the axis of rotation;
• with respect to the predefined direction of rotation, the diameter increases from one of the at least two clamping surface pairs to a successive one of the at least two clamping surface pairs;
• and
• the clamping sections each comprise one clamping surface of each of the at least two clamping surface pairs;
• wherein in each respective clamping section the successive one of the at least two clamping surface pairs is a leading surface in the predefined direction of rotation.

A carrier for a rotary tool, wherein the carrier extends in an axial direction and has a predefined direction of rotation about an axis of rotation, the carrier comprising:

• a pin receptacle having a pair of clamping sections;
• the clamping sections being disposed opposite one another at sides of the clamping pin;
• wherein each of the clamping sections comprises clamping surfaces;
• each of the clamping surfaces extends along and is shaped as a circular arc when viewed in cross section orthogonally to the axial direction;
• the clamping surfaces are arranged in at least two clamping surface pairs disposed opposite one another, with respect to the axis of rotation;
• for each of the at least two clamping surface pairs, the circular arcs of the clamping surfaces define a constant, predefined diameter as measured through the axis of rotation;
• and
• with respect to the predefined direction of rotation, the diameter increases from one of the at least two clamping surface pairs to a successive one of the at least two clamping surface pairs;
• and
• the clamping sections each comprise one clamping surface of each of the at least two clamping surface pairs;
• wherein in each respective clamping section the successive one of the at least two clamping surface pairs is a leading surface in the predefined direction of rotation.