Patent ID: 7959512

Claim:
A flexible disk enabling a transmission shaft to be connected in rotation with a mechanical part in spite of misalignment between said transmission shaft and said mechanical part, said flexible disk being suitable for forming rotary motion about an axis of rotation and being provided in succession going from its center towards its periphery with an empty central zone, with a circular base, with a transition zone having an outer face and an inner face, and then with a peripheral collar, said circular base having a shoulder that projects from said flexible disk from the outer face side of said transition zone; wherein said transition zone presents a minimum thickness at the edge of said peripheral collar, said minimum thickness being determined with the help of the following thickness relationship, where (e) represents the thickness of the transition zone at a first distance (r) from said axis of rotation, (Q) is a constant depending on said misalignment, (C) represents the torque to be applied to said transmission shaft for which the disk needs to be dimensioned, (r) represents said first distance, and (R) represents the radius of said empty central zone: e = 1 2 ⁢ r 2 ⁡ ( Q C - 2 ⁢ r r 4 - R 4 ) .