Braking device

1. A braking device for a vehicle, comprising a disc of a disc brake suitable for rotating about a rotation axis, wherein said disc comprises a disc body; and wherein said disc body comprises a braking band having opposite braking surfaces; and

wherein said disc body comprises at least one connection portion suitable for connecting the disc to a connection device of a vehicle associable with the braking device;

and wherein said braking band defines an axial direction parallel to the rotation axis of the disc, a radial direction orthogonal to the axial direction and a tangential direction or circumferential direction, orthogonal both to the axial direction and to the radial direction;

and wherein said at least one connection portion comprises seat walls which delimit at least one seat;

and wherein said seat walls comprise:

at least one dragging surface suitable for receiving a thrust action directed in circumferential direction,

at least one abutment surface opposed to said dragging surface;

and wherein said braking device further comprises at least one bush, suitable for being connected to a portion of said connection device;

and wherein said at least one bush comprises at least one engagement portion which is inserted with clearance into said seat, and wherein said braking device comprises at least one elastic element interposed between said abutment surface and said engagement portion of said bush;

and wherein said at least one elastic element comprises at least one arm, which projects cantilevered into said seat and which comprises a free terminal end and an attachment root, which comprises at least one contact area of said elastic element with said seat walls;

wherein said at least one arm comprises at least one working portion which touches said engagement portion of said bush and affects said bush to abut against said dragging surface,

wherein said at least one working portion of said at least one arm affect said at least one bush in said radial direction.

2. The braking device according to claim 1 , wherein said at least one working portion of said at least one arm exerts a mainly elastic thrust action on said bush to abut against said dragging surface; and/or wherein

said at least one working portion of said at least one arm which touches said at least one engagement portion of said bush exerts an exclusively elastic thrust action on said bush to abut against said dragging surface.

3. The braking device according to claim 1 , wherein said at least one elastic element exerts a preload which keeps the disc in contact with said at least one engagement portion of said bush; and/or wherein

said at least one arm, which projects cantilevered into said seat, remains free from stresses or constraints imposed by the seat walls.

4. The braking device according to claim 1 , wherein

said at least one elastic element comprises at least one friction surface, in contact with said abutment surface, which exerts a resistance action to the movement in axial direction of the disc with respect to the at least one bush, thus avoiding to exert an elastic return or thrust action in said axial direction on the disc; and/or wherein

said dragging surface and said abutment surface have an extension in said radial direction which is greater than or equal to the thermal expansion of the disc during the braking.

5. The braking device according to claim 1 , wherein said at least one elastic element comprises two of said arms, so as to form a pair of arms which extend cantilevered with respect to a portion of said elastic element in contact with said seat walls; and/or wherein

said elastic element is made of spring steel; and/or wherein

said elastic element comprises a leaf spring.

6. The braking device according to claim 1 , wherein said least one connection portion of said disc body comprises a plurality of connection portions; and/or wherein

said at least one connection portion comprises an axial surface of said at least one connection portion which delimits said at least one connection portion in an axial direction; and wherein

said at least one elastic element comprises a first extension of the attachment root of said at least one elastic element which extends from said attachment root and protrudes folding to axially rest against said axial surface of at least one connection portion; and wherein

said at least one connection portion comprises an axial counter-surface of said at least one connection portion, opposite to said axial surface of said at least one connection portion, which delimits said at least one connection portion in an axial but opposite direction; and wherein

said at least one elastic element comprises a second extension of the attachment root of at least one elastic element which extends from said attachment root, which is opposite with respect to said first extension of the attachment root of at least one elastic element, and protrudes folding to axially rest against said axial counter-surface of said connection portion.

7. The braking device according to claim 1 , wherein said seat walls of said disc body comprise at least one dragging support wall and at least one abutment support wall, opposed to said at least one dragging support wall.

8. The braking device according to claim 1 , wherein said braking device comprises at least one fixing element, which sandwiches said at least one bush and said at least one connection portion of the disc body against said connection device of the associable vehicle so as to allow the sliding of the disc in said axial direction with respect to the connection device; and/or wherein

said shoulder device of the at least one bush comprises an edge which surrounds the at least one engagement portion of said bush and forms at least one axial abutment surface facing the disc body, and at least one opposite axial abutment counter-surface.

9. A braking device according claim 6 , wherein said plurality of connection portions are equally spaced from one another in said circumferential direction.

10. A braking device according to claim 6 , wherein said at least one connection portion of said disc body comprises at least one dragging protrusion which protrudes cantilevered from said dragging support wall into said seat walls, said dragging protrusion comprising said dragging surface; and/or wherein said at least one connection portion of said disc body comprises at least one abutment protrusion which protrudes cantilevered from said abutment support wall into said seat walls, said abutment protrusion comprising said abutment surface.

11. A braking device according to claim 8 , wherein said at least one bush comprises at least one shoulder device suitable for being interposed between the disc body and the fixing element;

and/or wherein said at least one fixing element is a screw accommodated in a seat hole provided in the at least one bush so as to connect said at least one bush in a threaded hole provided in the connection device;

and/or wherein when the at least one fixing element is completely tightened in the threaded hole of the connection device, the at least one fixing element sandwiches the at least one bush and the disc body against the connection device, and wherein the at least one bush, with the axial abutment surface thereof, delimits an axial stroke of the at least one engagement portion of the at least one bush which is greater than an axial dimension of the connection portion of the disc body by a predefined axial clearance.