Disc for disc brakes

A bell for a disc of a disc brake, wherein said bell extends around a rotation axis (X-X) for the disc, said bell comprising:

• a flange configured for connecting the bell to a hub of a vehicle and
• a bell wall that from said flange projects towards at least one coupling extension of a brake band
• wherein:
• said bell for said disc defines an axial direction (A-A) parallel to said rotation axis (X-X), a radial direction (R-R) that defines a radially outward direction (RE) when going away from said rotation axis (X-X), as well as a radially inward direction (RI) when approaching said rotation axis (X-X), as well as a circumferential direction (T-T) perpendicular to said axial direction (A-A) and said radial direction (R-R);
• said bell defines, in a portion of said bell wall configured for coupling with said coupling extension of the brake band, a geometric coupling with said brake band to transmit the braking action from the brake band to the bell;
• said geometric coupling is obtained by molding the bell on the brake band without the use of another connecting component between said band and said bell, said bell being made from a second material different from a first material of the band;
• wherein said second material of the bell has a different melting point with respect to the melting point of the first material of the brake band;
• and
• said geometric coupling comprising:
• circumferentially spaced, axial seats defined by the bell configured for tightly receiving axial teeth that extend axially from the coupling extension of the band;
• and
• circumferentially spaced radial seats defined by the bell that extend substantially radially into said bell wall, each of said radial seats comprising a radial seat wall and a radial seat blind bottom that define a radial seat pocket that extends substantially radially into said bell wall, said radial seats being configured for tightly receiving radial teeth that extend radially from the band and are circumferentially offset with respect to said axial teeth.

A disc for a disc brake comprising a brake band wherein:

• the brake band and the bell extend around a rotation axis (X-X) for the disc, and
• said band and said disc define an axial direction (A-A) parallel to said rotation axis (X-X), a radial direction (R-R) that defines a radially outward direction (RE) when going away from said rotation axis (X-X), as well as a radially inward direction (RI) when approaching said rotation axis (X-X), as well as a circumferential direction (T-T) perpendicular to said axial direction (A-A) and said radial direction (R-R),
• said brake band is made from a first material configured for receiving a braking action exerted by pads on first and second braking surfaces of said brake band,
• said brake band has at least one coupling extension configured for coupling with said bell, said bell being configured for coupling the disc with a hub of a vehicle,
• said coupling extension of the brake band is integrally formed with said brake band,
• a geometric coupling between said brake band and said bell comprises said coupling extension of the brake band and at least a portion of a bell wall of said bell, said geometric coupling configured to transmit the braking action from the band to the bell,
• said geometric coupling is obtained by molding the bell on the brake band without the use of another connecting component between said band and said bell, said bell being made from a second material different from said first material of the band, and said second material of said bell having a different melting point with respect to a melting point of said first material of said brake band,
• said bell comprises:
• a flange configured for connecting the bell to the hub of the vehicle;
• and
• said bell wall that from said flange projects towards said at least one coupling extension of said brake band, and
• said geometric coupling comprises:
• circumferentially spaced axial teeth that extend axially from the band;
• circumferentially spaced axial seats defined by the bell, the axial seats extending axially into the bell wall and being configured for tightly receiving the axial teeth of the band;
• circumferentially spaced radial teeth that extend radially from the band and are circumferentially offset with respect to said axial teeth;
• and
• circumferentially spaced radial seats defined by the bell, the radial seats extending radially into the bell wall and being configured for tightly receiving the radial teeth of the band, each radial seat being defined by a radial seat wall and a radial seat blind bottom that define a radial seat pocket extending substantially radially into the bell wall.