Brake disc

Abstract

The present invention relates to a brake disc (1), comprising a bell (2) having a bell base (3) and a tubular wall (4); a braking band (5) having a band opening (6), wherein the tubular wall (4) of said bell (2) comprises a cup toothing system (7) having cup teeth (8) protruding outwards in a radial direction (R-R); said cup teeth (8) are circumferentially (C-C) interspersed by a cup gap (9); the braking band (5) comprises a ring toothing system (10); said ring teeth (12) are circumferentially (C-C) interspersed by a ring tooth gap (13); the cup toothing system (7) and the ring toothing system (10) are engaged with each other; at least one tubular wall portion (4) of said bell (2) comprises at least one radial and circumferential cup deformation (24) which forms at least one axial abutment (25) which delimits the displacement in the axial direction (A-A) of at least one ring tooth (12); wherein said at least one radial and circumferential cup deformation (24) comprises converging inclined walls (27, 28) which converge towards a vertex (29) arranged facing said at least one ring tooth (12).

Description

Brake discDESCRIPTION

[0001] . Field of the invention

[0002] . The present invention relates to braking devices comprising brake discs suited to vehicles.

[0003] . In particular, the present invention relates to a brake disc comprising a bell and a braking band coupled together with a toothing.

[0004] . Background art

[0005] . In a disc brake, the brake caliper is generally arranged straddling the outer peripheral margin of a brake disc, adapted to rotate about a rotation axis (A-A) defining an axial direction (X- X). In a disc brake, a radial direction (R-R), substantially orthogonal to said axial direction (X-X), and a tangential (C-C) or circumferential (C-C) direction, orthogonal to both said axial direction (X-X) and said radial direction (R-R), are further defined.

[0006] . Brake calipers are constrained to a support structure, which remains stationary with respect to the vehicle wheel, such as a stub axle of a vehicle suspension or a vehicle wheel hub or a fork, for example. The brake caliper usually comprises a caliper body having two elongated portions arranged so as to face opposite braking surfaces of a brake disc, and at least one bridge connecting said two elongated portions together. Suitably actuated calipers press the pads against the braking band and the braking action isproduced by the friction between the pads and the braking band of the brake disc.

[0007] . Brake discs are known, in which the bell is made of a different material from that of the braking band, and in particular bells made of a deformed and cup-shaped steel sheet and provided with a circumferential toothing to be coupled to the braking band.

[0008] . Such brake discs, which can be referred to as composite, for example of the Blechtopf type, allow a lower weight, for example, and thus help reduce the weight of the unsprung masses of the related vehicle.

[0009] . A brake disc of this type is known, for example, from DE102009012217 and EP2850333A1.

[0010] . Other similar solutions are known from DE102009012216, US2014000995, US2014311838, EP2404075A1, DE102012022775A1.

[0011] . In particular, US2014311838 discloses a brake disc comprising a braking band or friction ring and a bell arranged concentrically in an opening of the friction ring. The bell has a meshing system with a toothed gap on which a flap is modeled, which protrudes radially in the direction of a corresponding annular tooth of an annular gear system of the friction ring and radially overlaps the annular tooth on a first axial end of the braking band.

[0012] . In particular, this document discloses a brake disc of a motor vehicle, comprising: a bell with a bottom and a wall protruding and enclosing the bottom; a friction ring having an opening in which the bell wall is arranged, in which the bell and the friction ring are concentrically arranged, in which the bellwall has an axial meshing system running along an outer periphery, the meshing system having teeth protruding radially outwards, in which a respective tooth gap is arranged in a peripheral direction between adjacent teeth, in which the friction ring has an axial annular gearing system running along an inner periphery, the axial gearing system of the friction ring is configured to mesh with the bell meshing system and has annular teeth projecting radially inward, in which a respective annular slot between the teeth of the axial gearing system of the friction ring is arranged in a peripheral direction between adjacent annular teeth, in which the teeth of the bell engage in the annular tooth gaps of the axial gearing system of the friction ring, in which the annular teeth of the axial annular gearing system of the friction ring engage in the tooth gaps of the bell, in which, on a wall delimiting the gaps, a protrusion is molded protruding radially outwards and radially overlapping a respective annular tooth of the friction ring, in which the annular tooth of the friction ring has an axial recess, with which the protrusion engages axially.

[0013] . In this case, the braking band and the bell each have teeth, these teeth being in mutual engagement to allow the torque transmission between the braking band and the bell. To also ensure the axial attachment between the braking band and the bell, the bell has retaining elements which are directed radially outwards on an upper edge and rest against a corresponding surface of the braking band.

[0014] . However, the geometry and the manufacturing method of theaxial constraints of current Blechtopf discs do not ensure an appropriate precision in the contact between band and bell. In particular, the tooth of the braking band rests on a surface obtained by deformation, creating a support which is sometimes irregular, generating tolerances of the assembled disc which are higher than desired (offset, in particular understood as a geometric tolerance, which creates a defect where it exceeds two defined values; and Lateral Run Out).

[0015] . This uncertainty of position or measurement difficulty, poses issues in the assembly of the disc, especially if the band is already assembled in the finished state (i.e., discs without excess metal for subsequent calibration), such as, for example, ferritic nitrocarburized braking bands and coated discs.

[0016] . Furthermore, the braking bands are ventilated in order to dissipate the heat developed during the braking action.

[0017] . The drawback of such a solution is that such an axial attachment between the braking band and the bell occurs

[0018] . at one of the two plates of the braking band.

[0019] . In particular, the braking band toothing is made on the lower edge of the braking band plate facing the vehicle wheel so as to minimize the axial extension of the tubular portion of the bell and facilitate the ingress of cooling air from the central opening of the braking band.

[0020] . However, these known solutions have a non-ideal mass distribution to resist and minimize the thermal distortions generated by heating the braking band. Indeed, the constraint of thebell to the plate facing the wheel leads to a dissymmetric thermal expansion of the braking band, which, in the case of high overheating, results in a significant departure from the ideal braking plane of the braking surfaces delimiting the exterior of the plates.

[0021] . Solution

[0022] . Therefore, it is the object of the present invention to provide a disc brake including a toothed connection between a bell and a braking band and minimizing the axial variation of the support between band and bell.

[0023] . These and other objects and advantages are achieved by a

[0024] . brake disc according to claim 1.

[0025] . Some advantageous embodiments are the subject of the dependent claims.

[0026] . From the discussion of this solution it emerges that the suggested solution allows obtaining a brake disc in which the axial variation of the support between band and bell is minimized. By virtue of the suggested solution, it is also possible to minimize the non-ideal mass distribution, in order to resist and minimize the thermal distortions generated by the heating of the braking band without simultaneously compromising the ventilation and especially a heat exchange between the braking band and the cooling air.

[0027] . In particular, the suggested solution ensures a single and certain point of contact between braking band and bell, allowing the use of bands which cannot be then reprocessed, i.e., for example, flattened in their portions of contact with the bell, after beingassembled.

[0028] . The suggested solution allows, while apparently reducing the support surface of each single radial and circumferential cup deformation, actually creating a certain support point, creating as a whole a larger surface of certain contact between braking band and bell to determine the axial constraint, thus ensuring less plastic deformation thereof and dimensional stability when biased by the assembly forces of the bell and the braking band and by the forces in operation.

[0029] . The suggested solution ensures a better repeatability of the measurements [for example, bell offset (axial distance between the support plane of the bell on the hub and the contact surface between band toothing and bell) and Planarity and / or runout of the contact surface of the axial stops] while simultaneously reducing the uncertainty thereof, since the point of interest is better geometrically defined.

[0030] . Where the manufacturing method is performed by milling, this ensures per se better tolerances than the current method, thus increasing the expected benefit of the solution.

[0031] . The expected advantages concern reduction of waste, stability under load of the contact between band and bell. This is particularly relevant when a reprocessing of the braking bands and in particular of the braking surfaces thereof is not envisaged or is not possible (for example in coated discs, discs with heat treatment).

[0032] . Figures

[0033] . Further features and advantages of the device, the disc brake, and the vehicle will become apparent from the following description of preferred embodiments thereof, given by way of nonlimiting indication, with reference to the accompanying drawings, in which:

[0034] . - Figure 1 shows an axonometric view of a brake disc from the wheel side;

[0035] . - Figure 2 shows an axonometric view of the disc in Figure1 from the vehicle side;

[0036] . - Figure 3 shows an axonometric view with parts separated of the braking band and the disc bell in Figure 1 from the vehicle side;

[0037] . - Figure 4 shows an axonometric view of a detail of the braking band in Figure 3;

[0038] . - Figure 5 shows an axonometric view of the bell and a detail of the bell in Figure 3;

[0039] . - Figure 6 shows an axonometric view of a detail of the bell of the disc in Figure 5 from the vehicle side;

[0040] . - Figure 7 shows an axonometric view of a detail of the bell in Figure 6 from the radially inner side;

[0041] . - Figure 8 shows an axonometric view of a detail of the bell in Figure 6 from the radially outer side;

[0042] . - Figure 9 shows an axonometric view, sectioned along an axial and radial plane of the disc in Figure 1, from the vehicle side;

[0043] . Figure 10 shows an axonometric sectioned view of anenlargement of the coupling between the bell and the braking band.

[0044] . Description of some preferred embodiments

[0045] . In accordance with a general embodiment, a brake disc 1 comprises a bell 2 having a bell base 3 and a tubular wall 4 protruding axially A-A from said bell base 3, said brake disc 1 further comprising a braking band 5 having a band opening 6.

[0046] . The tubular wall 4 of said bell 2 comprises a cup toothing system 7 extending along a circumference outside said tubular wall 4 and having cup teeth 8 protruding outwards in a radial direction R- R.

[0047] . Said cup teeth 8 are circumferentially C-C interspersed by a cup gap 9, where each cup gap 9 is in the circumferential direction C-C between adjacent cup teeth 8.

[0048] . The braking band 5 comprises a ring toothing system 10 having an annular ring body 11 from which ring teeth 12 extend, protruding radially inwards at the band opening 6.

[0049] . Said ring teeth 12 are circumferentially C-C interspersed by a ring tooth gap 13. Each ring tooth gap 13 is located in the circumferential direction C-C between ring teeth 12.

[0050] . The cup toothing system 7 and the ring toothing system 10 are engaged with each other.

[0051] . At least one of said cup teeth 8 or at least one tubular wall portion 4 of said bell 2 delimiting said cup gap 9 comprises at least one radial and circumferential cup deformation 24 which forms at least one axial abutment 25 delimiting the displacement in the axial direction A-A of at least one ring tooth 12 at least in onedirection.

[0052] . Said at least one radial and circumferential cup deformation 24 comprises converging inclined walls 27, 28 which converge towards a vertex 29 arranged facing said at least one ring tooth 12.

[0053] . In accordance with an embodiment, said vertex 29 has a flattened cusp shape; and in which said vertex 29 forms an axial stop abutment 26 in the axial direction A-A for said at least one ring tooth 12.

[0054] . In accordance with an embodiment, said at least one ring tooth 12 has a ring tooth sliding surface 37 facing the inner radial direction R-R and adapted to slide on said tubular wall 4 of the bell 2.

[0055] . In accordance with an embodiment, said at least one ring tooth 12 has a ring tooth chamfer 38 which connects said ring tooth sliding surface 37 with the surface of abutment of said at least one ring tooth 12 against said bell 2.

[0056] . In accordance with an embodiment, said vertex 29 is flattened to form a vertex resting surface 30 which lies substantially in a plane containing the circumferential direction C- C and the orthogonal radial direction R-R.

[0057] . In accordance with an embodiment, said vertex 29 is flattened to form a vertex resting surface 30 obtained by milling.

[0058] . In accordance with an embodiment, said vertex 29 is flattened to form a vertex resting surface 30 which only partially affects the radial extension R-R of said vertex 29, leaving in theremaining portion 31 a connected shape which connects said converging inclined walls 27, 28.

[0059] . In accordance with an embodiment, said at least one radial and circumferential cup deformation 24 is a plurality of radial and circumferential cup deformations 24, each having said vertex 29 which is flattened to form a vertex resting surface 30 which forms an axial stop abutment 26 in the axial direction A-A for said at least one ring tooth 12; and in which all axial abutments 26 of all said vertices 29 lie substantially in a single plane containing the same circumferential direction C-C and the same orthogonal radial direction R-R.

[0060] . In accordance with an embodiment, said at least one radial and circumferential cup deformation 24 is a plurality of radial and circumferential cup deformations 24, each having said vertex 29 which is flattened to form a vertex resting surface 30 which forms an axial stop abutment 26 in the axial direction A-A.

[0061] . A plurality of ring teeth 12 extends from said annular ring body 11, which abut against said axial stop abutments 26 in the axial direction A-A.

[0062] . In accordance with an embodiment, all axial abutments 26 of all said vertices 29 lie substantially in a single plane containing the same circumferential direction C-C and the same orthogonal radial direction R-R.

[0063] . In accordance with an embodiment, said at least one radial and circumferential cup deformation 24 is arranged in said cup gap

[0064] . In accordance with an embodiment, said tubular wall portion 4 of said bell 2 delimiting said cup gap 9 in the portion thereof which forms said at least one radial and circumferential cup deformation 24 is shaped so as to degrade radially towards said tubular wall 4 of said bell 2, forming an inclined plane considered in a section formed by a plane containing a radial direction R-R and an axial direction A-A.

[0065] . In accordance with an embodiment, said at least one radial and circumferential cup deformation 24 projects from said tubular wall 4 in the outer radial direction R-R, i.e., away from a rotation axis of said bell 2.

[0066] . In accordance with an embodiment, said cup teeth 8 are equally spaced circumferentially.

[0067] . In accordance with an embodiment, said cup teeth 8 have a main extension along the axial direction A-A.

[0068] . In accordance with an embodiment, said cup gaps 9 are equally spaced circumferentially.

[0069] . In accordance with an embodiment, said cup gaps 9 have a main extension along the axial direction A-A.

[0070] . In accordance with an embodiment, at least one of said cup teeth 8 or at least one tubular wall portion 4 of said bell 2 delimiting said cup gap 9 comprises at least one radial cup deformation 23.

[0071] . In accordance with an embodiment, said at least one radial cup deformation 23 projects from said tubular wall 4 in the outer radial direction R-R.

[0072] . In accordance with an embodiment, said at least one radial and circumferential cup deformation 24 and said at least one radial cup deformation 23 alternate one at a time on adjacent cup teeth 8 or cup gaps 9.

[0073] . In accordance with an embodiment, said at least one radial and circumferential cup deformation 24 and said at least one radial cup deformation 23 face at least one of said ring teeth 12 on opposite sides.

[0074] . In accordance with an embodiment, said at least one radial and circumferential cup deformation 24 and said at least one radial cup deformation 23 face two adjacent ring teeth 12 on opposite sides.

[0075] . In accordance with an embodiment, said at least one radial and circumferential cup deformation 24 and said at least one radial cup deformation 23 are a plurality and circumferentially distributed and facing two adjacent ring teeth 12 on opposite sides.

[0076] . In accordance with an embodiment, said at least one radial and circumferential cup deformation 24 is arranged close to said bell base 3.

[0077] . In accordance with an embodiment, said radial cup deformation 23 is arranged close to the tubular wall end 4 which is opposite to said bell base 3.

[0078] . In accordance with an embodiment, said at least one radial cup deformation 23 is shaped like a bridge projecting from a ring tooth 8 to an adjacent ring tooth 8.

[0079] . In accordance with an embodiment, said at least one radialcup deformation 23 is shaped like a bridge forming at least a first loop 32 facing the inner radial direction R-R with the concavity thereof; and in which said bridge connects to the tubular wall 4 with a second loop 33 facing the outer radial direction R-R with the concavity thereof.

[0080] . Said bridge connects to the tubular wall 4 with a third loop 34 opposite to said second loop 33 with respect to said first loop 32 and facing the outer radial direction R-R with the concavity thereof.

[0081] . In accordance with an embodiment, said at least one radial cup deformation 23 faces a cup window 35 in the axial direction A-A, which forms a circumferentially C-C elongated slit.

[0082] . In accordance with an embodiment, said at least one radial cup deformation 23 faces a cup window 35 in the axial direction A-A, which forms a circumferentially C-C elongated slit; and in which said cup window 35 extends on two mutually adjacent cup teeth 8.

[0083] . In accordance with an embodiment, said cup teeth 8 have, in a section formed by a plane containing a radial direction R-R and a circumferential direction C-C, an arched shape with the concavity facing the rotation axis X-X of the bell 2.

[0084] . In accordance with an embodiment, said tubular wall 4 which forms said cup gaps 9 has, where it delimits each cup gap 9, in a section formed by a plane containing a radial direction R-R and a circumferential direction C-C, a bottom wall portion 36 facing the rotation axis X-X of the bell 2 having a substantially planar shape or lying on a circumference having its center on the rotation axisX-X of the bell 2.

[0085] . In accordance with a general embodiment, a disc brake 1 comprises a bell 2. The bell 2 comprises a bell base 3, e.g., discshaped, and a tubular wall 4. The tubular wall 4 protrudes axially A-A from said bell base 3.

[0086] . Said brake disc 1 further comprises a braking band 5 centrally having a band opening 6.

[0087] . The tubular wall 4 of said bell 2 comprises a cup toothing system 7 extending along a circumference outside said tubular wall 4. Said cup toothing 7 comprises cup teeth 8 protruding outwards in the radial direction R-R.

[0088] . According to an embodiment, the tubular wall 4 of said bell 2 forms in one piece a cup toothing system 7 extending along a circumference outside said tubular wall 4 and comprising cup teeth 8 protruding outwards in a radial direction R-R.

[0089] . Said cup teeth 8 are circumferentially C-C interspersed by a cup gap 9, where each cup gap 9 is in the circumferential direction C-C between adjacent cup teeth 8.

[0090] . The braking band 5 further comprises a ring toothing system 10 having an annular ring body 11 from which ring teeth 12 radially inwardly protruding at the band opening 6 extend.

[0091] . According to an embodiment, the braking band 5 forms in one piece a ring toothing system 10 having an annular ring body 11 from which ring teeth 12 radially inwardly protruding at the band opening 6 extend.

[0092] . Said ring teeth 12 are circumferentially C-C interspersedby a ring tooth gap 13, where each ring tooth gap 13 is in the circumferential direction C-C between ring teeth 12.

[0093] . The cup toothing system 7 and the ring toothing system 10 are engaged with each other.

[0094] . According to an embodiment, the cup toothing system 7 and the ring toothing system 10 are engaged with each other and are intimately coupled together.

[0095] . Said braking band 5 is a ventilated braking band comprising a first wheel-side band plate 14 and a second vehicleside band plate 15 mutually facing and spaced apart by a ventilation duct 16 and mutually connected by plate connection elements 17.

[0096] . In accordance with an embodiment, said annular ring body 11 of said ring toothing system 10 at least partially faces said ventilation duct 16 forming at least one annular channel 18 at the base of said first or second plate 14, 15 delimited by said tubular wall 4 of said bell 2 at least on one side thereof.

[0097] . According to an embodiment, said annular ring body 11 is a single body which is continuous in the circumferential direction C- C.

[0098] . According to an embodiment, said annular ring body 11 is connected to one of said first or second plate 14, 15 by at least one inclined connection element 19 forming said annular channel 18 at the base of said first or second plate 14, 15.

[0099] . According to an embodiment, said annular ring body 11 is a single body which is continuous in the circumferential direction C-C.

[0100] . Said annular ring body 11 is connected to one of said first or second plate 14, 15 by at least one inclined connection element 19 forming said annular channel 18 at the base of said first or second plate 14, 15.

[0101] . According to an embodiment, said annular ring body 11 is connected to one of said first or second plates 14, 15 by at least one circumferentially continuous inclined connection element 19.

[0102] . According to an embodiment, said annular ring body 11 comprises a flared ring wall 21 facing said tubular wall 4 of said bell 2.

[0103] . According to an embodiment, said annular ring body 11 comprises a flared ring wall 21 facing said tubular wall 4 of said bell 2 and where said flared ring wall 21 is frustoconical in shape.

[0104] . According to an embodiment, said annular ring body 11 is discontinuously connected to an opposite plate 15, 14 with respect to said first or second plate 14, 15.

[0105] . According to an embodiment, said annular ring body 11 is discontinuously connected to an opposite plate 15, 14 with respect to said first or second plate 14, 15 by a plurality of ring column elements 20 mainly extending in the axial direction A-A.

[0106] . According to an embodiment, said annular ring body 11 is discontinuously connected to an opposite plate 15, 14 with respect to said first or second plate 14, 15 by a plurality of ring column elements 20 mainly extending in the axial direction A-A, where each ring column element connects close to the inner radial end of said opposite plate 15, 14 remaining within said ventilation duct 16.

[0107] . According to an embodiment, said annular ring body 11 is discontinuously connected to an opposite plate 15, 14 with respect to said first or second plate 14, 15 by a plurality of ring column elements 20 mainly extending in the axial direction A-A and where said ring column elements 20 are enlarged at the ends thereof and tapered towards a smaller portion located between said ends.

[0108] . According to an embodiment, said annular ring body 11 is discontinuously connected to an opposite plate 15, 14 with respect to said first or second plate 14, 15 by a plurality of ring column elements 20 mainly extending in the axial direction A-A and where ventilation openings 22 are formed between the ring column elements 20, which put said band opening 6 in communication with said ventilation duct 16.

[0109] . According to an embodiment, at least one of said cup teeth 8 or at least one tubular wall portion 4 of said bell 2 delimiting said cup gap 9 comprises at least one radial cup deformation 23 or radial and circumferential cup deformations 24 forming at least one axial abutment 25 which delimits, at least in one direction, the displacement in the axial direction A-A of at least one ring tooth 12.

[0110] . According to an embodiment, at least one of said cup teeth 8 or at least one tubular wall portion 4 of said bell 2 delimiting said cup gap 9 comprises at least one pair of radial cup deformations 23 or radial and circumferential cup deformations 24 forming at least two opposing axial abutments 25 which delimit, in opposite directions, the displacement in the axial direction A-A ofat least one ring tooth 12.

[0111] . According to an embodiment, said bell 2 is obtained from at least one deformed and shaped sheet metal.

[0112] . In order to meet specific, contingent needs, those skilled in the art may make several changes and adaptations to the abovedescribed embodiments and may replace elements with others which are functionally equivalent, without however departing from the scope of the following claims.LIST OF REFERENCE SIGNS1 brake disc2 bell3 bell base4 tubular wall5 braking band6 band opening7 cup toothing system8 cup teeth9 cup gap10 ring toothing system11 annular ring body12 ring teeth13 ring tooth gap14 first wheel-side band plate15 second vehicle-side band plate16 ventilation duct17 plate connection elements18 annular canal19 inclined connection element20 ring column element21 flared ring wall22 ventilation openings23 radial cup deformations24 radial and circumferential cup deformations25 axial abutment26 axial abutment27 converging inclined walls of radial and circumferential cup deformation28 converging inclined walls of radial and circumferential cup deformation29 radial and circumferential cup deformation vertex30 flattened vertex surface31 remaining vertex portion with connected shape32 first bridge loop33 second bridge loop34 third bridge loop 35 cup window36 cup gap bottom wall portion37 Ring tooth sliding surface38 ring tooth chamferA—A axial direction R-R radial directionC-C circumferential directionX—X disc axis of disc brake

Claims

CLAIMS1. A brake disc (1) comprising a bell (2) having a bell base (3) and a tubular wall (4) protruding axially (A-A) from said bell base (3), said brake disc (1) further comprising a braking band (5) having a band opening (6), wherein- the tubular wall (4) of said bell (2) comprises a cup toothing system (7) extending along circumference outside said tubular wall (4) and having cup teeth (8) protruding outwards in a radial direction (R-R),- said cup teeth (8) are circumferentially (C-C) interspersed by a cup gap (9), wherein each cup gap (9) is located in the circumferential direction (C-C) between adjacent cup teeth (8),- the braking band (5) comprises a ring toothing system (10) having an annular ring body (11) from which ring teeth (12) extend, protruding radially inwards at the band opening (6),- wherein said ring teeth (12) are circumferentially (C-C) interspersed by a ring tooth gap (13), wherein each ring tooth gap (13) is located in the circumferential direction (C-C) between ring teeth (12);- and wherein the cup toothing system (7) and the ring toothing system (10) are engaged with each other,- wherein at least one of said cup teeth (8) or at least one tubular wall portion (4) of said bell (2) delimiting said cup gap (9) comprises at least one radial and circumferential cup deformation (24) which forms at least one axial abutment (25, 26) delimiting the displacement in the axial direction (A-A) of at least one ring tooth(12) at least in one direction; characterized in that said at least one radial and circumferential cup deformation (24) comprises converging inclined walls (27, 28) which converge towards a vertex (29) arranged facing said at least one ring tooth (12).

2. A brake disc (1) according to claim 1, wherein at least one of the following features is present:- said vertex (29) has a flattened cusp shape; and wherein said vertex (29) forms an axial stop abutment (26) in the axial direction (A-A) for said at least one ring tooth (12);- said vertex (29) is flattened to form a vertex resting surface (30) which lies substantially in a plane containing the circumferential direction (C-C) and the orthogonal radial direction (R-R);- said vertex (29) is flattened to form a vertex resting surface (30) obtained by milling;- said vertex (29) is flattened to form a vertex resting surface (30) which only partially affects the radial extension (R-R) of said vertex (29), leaving in the remaining portion (31) a connected shape which connects said converging inclined walls (27, 28).

3. A brake disc (1) according to claim 1 or 2, wherein at least one of the following features is present:- said at least one radial and circumferential cup deformation (24)is a plurality of radial and circumferential cup deformations (24), each having said vertex (29) which is flattened to form a vertex resting surface (30) which forms an axial stop abutment (26) in the axial direction (A-A) for said at least one ring tooth (12); and wherein all axial abutments (26) of all said vertices (29) lie substantially in a single plane containing the same circumferential direction (C-C) and the same orthogonal radial direction (R-R);- said at least one radial and circumferential cup deformation (24) is a plurality of radial and circumferential cup deformations (24), each having said vertex (29) which is flattened to form a vertex resting surface (30) which forms an axial stop abutment (26) in the axial direction (A-A); and wherein a plurality of ring teeth (12) extends from said annular ring body (11), which abut against said axial stop abutments (26) in the axial direction (A-A), and wherein all axial abutments (26) of all said vertices (29) lie substantially in a single plane containing the same circumferential direction (C- C) and the same orthogonal radial direction (R-R).

4. A brake disc (1) according to any one of claims 1 to 3, wherein at least one of the following features is present:- said at least one radial and circumferential cup deformation (24) is arranged in said cup gap (9);- said tubular wall portion (4) of said bell (2) delimiting said cup gap (9) in the portion thereof which forms said at least one radialand circumferential cup deformation (24) is shaped so as to degrade radially towards said tubular wall (4) of said bell (2), forming an inclined plane considered in a section formed by a plane containing a radial direction (R-R) and an axial direction (A-A);- said at least one radial and circumferential cup deformation (24) projects from said tubular wall (4) in the outer radial direction (R-R), i.e., away from a rotation axis of said bell (2);5. A brake disc (1) according to any one of claims 1 to 4, wherein at least one of the following features is present:- said cup teeth (8) are equally spaced circumferentially;- said cup teeth (8) have a main extension along the axial direction (A-A);- said cup gaps (9) are equally spaced circumferentially;- said cup gaps (9) have a main extension along the axial direction (A-A);- at least one of said cup teeth (8) or at least one tubular wall portion (4) of said bell (2) delimiting said cup gap (9) comprises at least one radial cup deformation (23);- said at least one radial cup deformation (23) projects from said tubular wall (4) in the outer radial direction (R-R).

6. A brake disc (1) according to claim 5, wherein at least one of the following features is present:- said at least one radial and circumferential cup deformation (24)and said at least one radial cup deformation (23) alternate one at a time on adjacent cup teeth (8) or cup gaps (9);- said at least one radial and circumferential cup deformation (24) and said at least one radial cup deformation (23) face at least one of said ring teeth (12) on opposite sides;- said at least one radial and circumferential cup deformation (24) and said at least one radial cup deformation (23) face two adjacent ring teeth (12) on opposite sides;- said at least one radial and circumferential cup deformation (24) and said at least one radial cup deformation (23) are a plurality and circumferentially distributed and facing two adjacent ring teeth (12) on opposite sides.

7. A brake disc (1) according to any one of claims 1 to 6, wherein- said at least one radial and circumferential cup deformation (24) is arranged close to said bell base (3).

8. A brake disc (1) according to any one of claims 5 to 7, when dependent on claim 5, wherein at least one of the following features is present:- said radial cup deformation (23) is arranged close to the tubular wall end (4) which is opposite to said bell base (3);- said at least one radial cup deformation (23) is shaped like a bridge projecting from a ring tooth (8) to an adjacent ring tooth (8);-said at least one radial cup deformation (23) is shaped like a bridge forming at least a first loop (32) facing the inner radial direction (R-R) with the concavity thereof; and wherein said bridge connects to the tubular wall (4) with a second loop (33) facing the outer radial direction (R-R) with the concavity thereof; and wherein said bridge connects to the tubular wall (4) with a third loop (34) opposite to said second loop (33) with respect to said first loop (32) and facing the outer radial direction (R-R) with the concavity thereof;- said at least one radial cup deformation (23) faces a cup window (35) in the axial direction (A-A), which forms a circumferentially (C-C) elongated slit;- said at least one radial cup deformation (23) faces a cup window (35) in the axial direction (A-A), which forms a circumferentially (C-C) elongated slit; and wherein said cup window (35) extends on two mutually adjacent cup teeth (8).

9. A brake disc (1) according to any one of claims 1 to 3, wherein at least one of the following features is present:- said cup teeth (8) have, in a section formed by a plane containing a radial direction (R-R) and a circumferential direction (C-C), an arched shape with the concavity facing the rotation axis (X-X) of the bell (2);- said tubular wall (4) which forms said cup gaps (9) has, where it delimits each cup gap (9), in a section formed by a plane containinga radial direction (R-R) and a circumferential direction (C-C), a bottom wall portion (36) facing the rotation axis (X-X) of the bell (2) having a substantially planar shape or lying on a circumference having its center on the rotation axis (X-X) of the bell (2).

10. A brake disc (1) according to any one of claims 1 to 9, wherein at least one of the following features is present:- said braking band (5) is a ventilated braking band comprising a first wheel-side band plate (14) and a second vehicle-side band plate (15) mutually facing and spaced apart by a ventilation duct (16) and mutually connected by plate connection elements (17); said annular ring body (11) of said ring toothing system (10) at least partially faces radially said ventilation duct (16) forming at least one annular channel (18) at the base of said first or second plate (14, 15), delimited by said tubular wall (4) of said bell (2) at least on one side thereof.

11. A brake disc (1) according to any one of claims 1 to 10, wherein at least one of the following features is present:- said annular ring body (11) is a single body, continuous in the circumferential direction (C-C);- said annular ring body (11) is connected to one of said first or second plate (14, 15) by means of at least one inclined connection element (19) which forms said annular channel (18) at the base of said first or second plate (14, 15);- said annular ring body (11) is a single body, continuous in the circumferential direction (C-C);- said annular ring body (11) is connected to one of said first or second plate (14, 15) by means of at least one inclined connection element (19) which forms said annular channel (18) at the base of said first or second plate (14, 15).

12. A brake disc (1) according to any one of claims 1 to 11, wherein at least one of the following features is present:- said annular ring body (11) is connected to one of said first or second plates (14, 15) by means of at least one circumferentially continuous, inclined connection element (19);- said annular ring body (11) comprises a flared ring wall (21) facing said tubular wall (4) of said bell (2).

13. A brake disc (1) according to any one of claims 1 to 12, wherein- said annular ring body (11) comprises a flared ring wall (21) facing said tubular wall (4) of said bell (2) and wherein said flared ring wall (21) is frustoconical in shape.

14. A brake disc (1) according to any one of claims 1 to 13, wherein- said annular ring body (11) is connected in a discontinuous manner to an opposite plate (15, 14) with respect to said first or second plate (14, 15).

15. A brake disc (1) according to any one of claims 1 to 14, wherein at least one of the following features is present:- said annular ring body (11) is connected in a discontinuous manner to an opposite plate (15, 14) with respect to said first or second plate (14, 15) by means of a plurality of ring column elements (20) mainly extending in the axial direction (A-A);- said annular ring body (11) is connected in a discontinuous manner to an opposite plate (15, 14) with respect to said first or second plate (14, 15) by means of a plurality of ring column elements (20) mainly extending in the axial direction (A-A), wherein each ring column element connects close to the inner radial end of said opposite plate (15, 14) remaining inside said ventilation duct (16).

16. A brake disc (1) according to any one of claims 1 to 15, wherein - said annular ring body (11) is connected in a discontinuous manner to an opposite plate (15, 14) with respect to said first or second plate (14, 15) by means of a plurality of ring column elements (20) mainly extending in the axial direction (A-A) and wherein said ring column elements (20) have a shape enlarged at the ends and tapered towards a smaller portion placed between said ends.

17. A brake disc (1) according to any one of claims 1 to 16, wherein at least one of the following features is present:- the annular ring body (11) is connected in a discontinuous manner to an opposite plate (15, 14) with respect to said first or secondplate (14, 15) by means of a plurality of ring column elements (20) mainly extending in the axial direction (A-A) and wherein ventilation openings (22) are formed between ring column elements (20), which put said band opening (6) in communication with said ventilation duct (16);- at least one of said cup teeth (8) or at least one tubular wall portion (4) of said bell (2) delimiting said cup gap (9) comprises at least one radial cup deformation (23) or radial and circumferential cup deformations (24) forming at least one axial abutment (25) which delimits the displacement in the axial direction (A-A) of at least one ring tooth (12) at least in one direction;- at least one of said cup teeth (8) or at least one tubular wall portion (4) of said bell (2) delimiting said cup gap (9) comprises at least a pair of radial cup deformations (23) or radial and circumferential cup deformations (24) which form at least two opposite axial abutments (25) delimiting the displacement in the axial direction (A-A) of at least one ring tooth (12) in opposite directions.

18. A brake disc (1) according to any one of the preceding claims, wherein- said bell (2) is obtained from at least one deformed and shaped sheet metal.

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