Driven disk clutch sub-unit for a motorcycle or other handlebar vehicle

A clutch sub-assembly for a motorcycle comprising:

• a hub configured to be connected in rotation to a main shaft of a motorcycle gearbox;
• a plurality of driven discs, wherein each of the plurality of driven discs defines a radially internal shaped profile to couple in a substantially rigid manner to rotation and free to translation parallel to an axis of a rotation of the hub, the plurality of driven discs are configured to cooperate in use with a plurality of friction discs connected by a clutch basket to a motor shaft of the motorcycle;
• an elastic element having a portion arranged to contrast against a fixed abutment rigidly connected to the hub;
• wherein:
• the hub comprises
• a plurality of projecting protrusions, wherein
• the plurality of projecting protrusions are substantially elongated in a direction parallel to a direction of a hub rotation axis and rigidly connected to the fixed abutment,
• each of the plurality of projecting protrusions comprises a respective shaped side and each of the plurality of projecting is coupled with relative portions of the radially internal shaped profile of the each of the plurality of driven discs, and
• at least a first guide portion, wherein the first guide portion faces, in use, to the plurality of driven discs having a cross section spaced from the hub rotation axis and the first guide portion defines, with a corresponding second guiding portion of an adjacent protrusion, radial openings for a passage of a lubricating oil;
• the hub defines a plurality of axial openings arranged on an opposite side of the fixed abutment;
• and
• the elastic element is a washer spring.