Coupling assembly for clutch input shaft (ES1121480U)

1. Joint for coupling input shaft clutch, applicable for the mutual coupling between the primary shaft (1) which transmits the torque and the hub (2) housing the discs, and other elements of a motorcycle clutch system , is characterized in that it comprises: - incorporated in said primary shaft (1), a base piece (3) having at least one planar face (3a) intended to constitute the attachment point to the hub (2) , which base part (3), it is having been machined with the same production process that said shaft (1) is incorporated integrally in the main shaft (1) with said bearing face (3a) located perpendicular and concentric with the axis of rotation (1a) of said input shaft (1); - and, on the outside of the hub (2), the existence of a reception area (4) complementary to the support face (3a), also constituted by a flat surface and, intended to constitute the attachment point with the input shaft (1) and also machined in the manufacturing process of said hub (2) itself, presents perpendicularity with the axis of rotation (2a) of the hub (2); and that, for fixing between the base (3) of the primary shaft (1) and the receiving area (4) of the hub (2), further means are provided removable fixing, allowing mounting and mutual removal. 2. Set input shaft for coupling clutch according to claim 1, wherein the means for fixing between the base (3) of the primary shaft (1) and the workpiece receiving area (4) of the hub (2) they are determined by the existence of through holes (5) provided on the base part (3) and the receiving area (4) arranged on coincident points, and enable the insertion of screws (6) to perform fixing together to corresponding nuts (7).