Clutch, in particular for a motorcycle, with pressure plate and centrifugal assembly

A clutch comprising:

• a housing rotatable around an axis of rotation;
• a fixed hub internal to said housing and configured for coupling with a shaft coaxial to said axis of rotation;
• a movable hub axially mounted along said axis of rotation onto said fixed hub and configured to rotate jointly with said fixed hub;
• a plurality of discs interposed between said fixed hub and said movable hub;
• wherein said fixed hub and said movable hub are further configured to axially slide, getting farther or closer to each other so as to transmit a variable axial load onto said plurality of discs, thereby selectively transmitting a torque from said housing to said shaft;
• said clutch further comprising a pressure plate assembly for controlling said variable axial load, said pressure plate assembly including a centrifugal assembly comprising:
• a mass holder configured to rotate jointly with said housing;
• a plurality of mass elements radially disposed in said mass holder around said axis of rotation;
• wherein each mass element comprises a pivot and is configured for a displacement under centrifugal effects by pivoting around said pivot;
• wherein said plurality of mass elements, in said displacement under centrifugal effects, are further configured for exerting an axial thrust within said pressure plate assembly, to bring said movable hub closer to said fixed hub, so as to increase said variable axial load;
• wherein each mass element comprises a main body and a column element connecting said pivot with said main body;
• wherein said column element is a substantially elongated and upright element, configured for increasing a lever's arm in said displacement under centrifugal effects;
• said mass element having a center of mass within said main body, wherein said pivot is radially more external than said center of mass with respect to said axis of rotation.