Blade-type torsional damper

A torsional damper for a torque transmission device, comprising:

• a first element (102) and a second element (103) rotationally movable with respect to one another around a rotation axis X;
• and
• a blade-type damping means for transmitting a torque and for damping rotational irregularities between the first element and the second element, the blade-type damping means comprising:
• at least one elastically deformable blade (117a, 117b) integral with one of said first and second elements;
• and
• at least one abutment element (121) carried by the other of said first and second elements and configured to interact with said at least one blade, said at least one blade being configured such that for an angular deflection between the first and second elements with respect to an inactive angular position, said at least one abutment element applies a flexural load onto said at least one blade, producing jointly a reaction force capable of returning the first and second elements to said inactive angular position,
• wherein for a predetermined angular sector, the blade-type damping means has two flexible blade regions (132, 134) offset radially from one another in a radial direction, an open space radially separating said two flexible blade regions.