Connection system between a braking band and a hat of a disc for a disc brake

1. A disc for a disc brake for motor vehicle use, having a central rotation axis, comprising:

a hat, suitable to be connected to a wheel hub, provided with a plurality of hat seats positioned circumferentially;

a braking band suitable to be engaged by a caliper of the disc brake to generate a braking torque, provided with a plurality of band seats, each open radially towards the respective hat seat; and

a connection system comprising at least one lug suitable for inserting in the hat seat and in the respective band seat to rotationally constrain, the band to the hat;

wherein the connection system comprises at least one stop element applicable to the hat or to the band, straddling the hat seat and the band seat, to axially retain the lug and determine the floating of the band;

wherein the lug comprises a tail suitable for inserting in the respective hat seat, and a head suitable for inserting in the band seat;

wherein the band seat prevents the radial translation towards the inside of the lug in relation to the band.

2. The disc according to claim 1 , where the band seat is delimited radially by an at least partially arched bottom surface.

3. The disc according to claim 2 , wherein the bottom surface has a profile defined by a circular arc of an extension greater than 180°.

4. The disc according to claim 1 , wherein the hat seat has, on an imaginary cross-section plane orthogonal to the rotation axis of the disc, a rectangular shape.

5. The disc according to claim 1 , wherein the hat comprises a plurality of axial protuberances between which said hat seats are defined, and wherein at least one of said axial protuberances has a step which forms a support surface on the side facing the outside of the hat, to define an axial support for the band.

6. The disc according to claim 5 , wherein the band comprises a plurality of radial band projections, between which said band seats are defined, and wherein said band projections are axially supported on the support surfaces of the hat.

7. The disc according to claim 6 , wherein the band projection is circumferentially recessed in relation to the support surface which it rests on.

8. The disc according to claim 1 , wherein the tail is suitable for inserting axially in the hat seat and the head is suitable for inserting axially in the band seat.

9. The disc according to claim 1 , wherein the head of the lug is rounded.

10. The disc according to claim 1 , wherein the hat seat allows the radial translation towards the outside of the lug in relation to the hat.

11. The disc according to claim 1 , wherein the tail of the lug has a greater height than the height of the head.

12. The disc according to claim 1 , wherein the lug is in one piece and constructed of metal selected from the group consisting of stainless steel and titanium.

13. The disc according to claim 1 , wherein the band comprises at least one flange comprising a ring bearing a braking surface.

14. The disc according to claim 13 , wherein the flange is made of cast iron, selected from the group consisting of spheroidal and flake iron, or carbon ceramic material.

15. The disc according to claim 13 , wherein the disc is of the ventilated type, wherein a single flange is engaged with the hat by means of the connection system, said flange being provided with said band seats.

16. The disc according to claim 1 , comprising a nose wheel which integrates elastic means for the realisation of an elastically yielding coupling in an axial direction between the band and the hat.

17. An assembly kit of a disc for a disc brake, comprising:

a braking band destined to be engaged by a caliper of the disc brake to generate a braking torque, provided with a plurality of band seats;

a plurality of lugs suitable for inserting in the band seat to constrain the band in rotation with a hat of the disc brake; and

at least one stop element applicable to the hat or to the band seat, straddling a hat seat and the band seat, to axially retain at least a lug of the plurality of lugs and determine the floating of the band seat;

wherein each band seat is open radially towards a respective hat seat;

wherein the luq comprises a tail suitable for inserting in the respective hat seat, and a head suitable for inserting in the band seat;

wherein the band seat prevents the radial translation towards the inside of the lug in relation to the band.