BRAKING BAND OF A DISC FOR A BRAKE DISC, DISC OF A BRAKE DISC, AND METHOD -OF MANUFACTURING THE SAME

摘要

A braking band (1) of a disc for brake disc, surprisingly capable of a particularly noiseless braking action, comprises a body (2) having a pre-established rotation axis (a), said body being restrained in the axial direction by a first braking surface (3) adapted to be rubbed by a brake pad, and a second braking surface (4), opposed to the first one, and adapted to be rubbed by a brake pad, in order to exert a braking action on a vehicle; said braking surfaces (3, 4) axially define a braking volume (5) of said body; said first braking surface comprising a first radially inner edge (6) which radially defines said surface on the rotation axis side, said first inner edge being inscribed by a first inner edge line (7) which is closed and lying on a circumference with radius (R1i) of a pre-established dimension; said first braking surface comprising a first radially outer edge (8) which radially defines said surface on the opposed side to the rotation axis, said first outer edge being circumscribed by a closed first outer edge line (9); said second braking surface comprising a second radially inner edge (10) which radially defines said surface on the rotation axis side, said second inner edge being inscribed by a second inner edge line (11) which is closed and lying on a circumference with radius (R2i) of a pre-established dimension; said second braking surface comprising a second radially outer edge (12) which radially defines said surface on the opposed side to the rotation axis, said second outer edge being circumscribed by a closed second outer edge line (13); said first and second outer edges being parts of a disc outer edge (14) which radially defines said disc on the opposed side to said rotation axis; where at least one axial portion (15) of said disc outer edge being circumscribed by a closed disc edge line (16) comprises at least one angular portion (A, B, C, D) which is radially recessed towards the rotation axis to form an edge outer recess (17) entering said braking volume.