Brake system

Abstract

The present invention relates to a unique vehicle braking system capable of determining a high heat exchange efficiency, comprising a disc brake disc (30) constituting a brake band (1). The brake band (1) has two opposing plates (3, 4) connected to each other by pins (13, 14) which together with the plates define a ventilation duct (7). The disc brake (30) further comprises a driving bell (20) adapted to be connected to a stub axle of the vehicle. The ventilation duct (7) is provided with at least one radial connecting extension (19) which connects the two opposing plates (3, 4) and which connects the brake band (1) to the driving bell (20) so that the brake band (1) and the driving bell (20) are integral. At least one radial connecting extension (19) has, on a part thereof and on both circumferentially oriented side surfaces (CC), a through opening oriented in the axial direction (AA) facing two axial through windows (24) both of which communicate with the ventilation duct (7).

Description

[Technical field]

[0001] Technical Field

[0002] The present invention relates to a brake system with brake discs suitable for a vehicle.

[0003] In particular, the present invention relates to braking systems that suffer from overheating problems primarily due to their small footprint. [Background technology]

[0004] Background technology

[0005] In a disc brake, a brake caliper is generally arranged to straddle the outer periphery of a brake disc and adapted to rotate about an axis of rotation (AA) defining an axial direction (XX), further defining a radial direction (RR) substantially perpendicular to said axial direction (XX) and a tangential or circumferential direction (CC) perpendicular to both said axial direction (XX) and said radial direction (RR).

[0006] Brake calipers are constrained to a support structure that remains stationary relative to the vehicle wheel, for example a stub axle of a vehicle suspension, a vehicle wheel hub, a fork, etc. Brake calipers typically consist of a caliper body having two elongated portions arranged to face opposite braking surfaces of a brake disc, and at least one bridge connecting said two elongated portions to each other. A properly operating caliper presses the pads against the brake band, and the braking action is produced by friction between the pads and the brake band of the brake disc.

[0007] A solution for a disc brake device is known from document EP 1 122 456 B1 to the same applicant and shows the features according to the preamble of claim 1.

[0008] This known solution, although optimized to achieve other objectives including improved expansion of the brake band heated by the braking action, is not optimized to eliminate or minimize overheating, especially when the brake disc is intended for small spaces. Moreover, this solution is not suitable for applying the parking brake action on the same device, for example by a shoe device inserted in the driving bell and acting on its inner cylindrical surface.

[0009] Other similar solutions are known from EP 1092889 A1, EP 0680571 B1, DE 19528434 A1 and US Pat. No. 5,823,303 A.

[0010] Solutions have also been proposed that are adapted to increase the heat exchange between ventilated brake bands and the air passing through ventilation ducts inside the brake band.

[0011] For example, document WO2012 / 164465A1 shows a circular projection or boss provided on the radially outer periphery of a ventilation duct.

[0012] Document EP 2 192 321 A1 shows a circular projection or boss provided on the radially inner circumference of a ventilation duct.

[0013] Document DE102012024298A1 shows a similar projection on a ventilation duct.

[0014] In the document EP2469117A1 a pin for connecting two plates of an elongated brake band is shown, which is oriented at an incline at different angles in order to divert the cooling air flow. However, this solution uses the wall of the pin to divert the air and obstructs the ventilation duct in its entire axial extension, resulting in the formation of zones with poor cooling air flow, which in turn leads to uneven heat exchange and dangerous hot spots in the brake disc mass, which can lead to the occurrence of localized expansions and thus to localized ruptures.

[0015] The connection of the driving bell with the connecting fins of the brake band plate is known from EP 0 403 799 A2, EP 0 680 571 B1 or US 5 161 652 A. Here too, the connection of the radial extension of the driving bell with the fins creates zones of insufficient airflow or shadow zones which completely bypass the cooling air and thus lead to local overheating points on the brake disc, resulting in dangerous hot spots in the brake disc mass and leading to local expansion and thus to the occurrence of local ruptures.

[0016] Therefore, there is still a strong need to find brake band and brake disc shapes which make it possible to have optimized ventilation ducts, for example in cases where the brake disc is required to have a small footprint due to a lack of space in the wheel rim, leading to the occurrence of cooling problems.

[0017] This cooling problem is accentuated when the drive bell also forms an inner cylindrical surface, for example for drum-in-hat or DIH type parking brakes: in this case the axial bell extension is elongated, which worsens the air ingress into the brake disc ventilation ducts and makes the brake disc overheating even more pronounced.

[0018] This problem is further accentuated by the presence of the dust boot and the brake caliper itself which is positioned across the brake disc. Summary of the Invention

[0019] solution

[0020] The present invention aims to provide a braking system which has a reduced tendency to overheat.

[0021] These and other objects and advantages are achieved by the disc brake according to claim 1.

[0022] Some advantageous embodiments are the subject matter of the dependent claims.

[0023] Analysis of this solution has shown that the proposed solution makes it possible to achieve a much higher air permeability, in particular a better heat exchange between the brake band area and the cooling air, than prior art solutions. [Brief description of the drawings]

[0024] drawing

[0025] Further characteristics and advantages of the device, disc brake and vehicle will become apparent from the following description of preferred embodiments thereof, given in a non-limiting manner with reference to the accompanying drawings, in which:

[0026] [Figure 1] FIG. 1 is a wheel-side axial view of a disc brake disc according to the present invention.

[0027] [Diagram 2] FIG. 2 is a vehicle-side axial view of the disc brake disc of FIG.

[0028] [Diagram 3] FIG. 3 is an axial cross-sectional view of the disc brake disc of FIG. 1 in a plane passing through the centerline of the ventilation duct.

[0029] [Figure 4] FIG. 4 is a front cross-sectional view of the disc brake disc of FIG. 1 taken along a plane passing through the centerline of the ventilation duct.

[0030] [Diagram 5] FIG. 5 is an enlarged detail of the cross section of FIG.

[0031] [Figure 6] FIG. 6 is a front cross-sectional view of a disc brake disc in a plane passing through the centre line of the ventilation duct according to a further embodiment.

[0032] [Figure 6] FIG. 7 is an enlarged detail of the cross section of FIG.

[0033] [Figure 8] FIG. 8 is an axial cross-sectional view of a disc brake disc in a plane parallel to the radial direction through the axis of rotation according to a further embodiment.

[0034] [Figure 9] FIG. 9 is a front cross-sectional view of the disc brake disc in FIG. 8 taken along a radial plane passing through the axis of rotation.

[0035] [Figure 10] FIG. 10 is a front cross-sectional view of a disc brake disc in a plane passing through the centre line of the ventilation duct according to a further embodiment.

[0036] [Figure 11] FIG. 11 is an enlarged detail of the cross section of FIG.

[0037] [Figure 12] FIG. 12 is an axial cross-sectional view of a disc brake disc parallel to the radial direction through the axis of rotation according to a further embodiment.

[0038] [Figure 13] FIG. 13 shows diagrammatically a cross-sectional view of a detail of a disc brake disc in a plane passing through the centre line of the ventilation duct and a corresponding view in radial direction from the inner edge of the brake band of the same disc brake disc according to a further embodiment.

[0039] [Figure 14] FIG. 14 shows diagrammatically a cross-sectional view of a detail of a further disc brake disc in a plane passing through the centre line of a ventilation duct according to a further embodiment and a corresponding view in radial direction from the inner edge of the brake band of the same disc brake disc.

[0040] [Figure 15]FIG. 15 shows diagrammatically a cross-sectional view of a detail of a further disc brake disc in a plane passing through the centre line of a ventilation duct according to a further embodiment and a corresponding view in radial direction from the inner edge of the brake band of the same disc brake disc. [Figure 16] FIG. 16 shows diagrammatically a cross-sectional view of a detail of a further disc brake disc in a plane passing through the centre line of a ventilation duct according to a further embodiment and a corresponding view in radial direction from the inner edge of the brake band of the same disc brake disc.

[0041] [Figure 17] FIG. 17 shows diagrammatically a cross-sectional view of a detail of a further disc brake disc in a plane passing through the centre line of a ventilation duct according to a further embodiment and a corresponding view in radial direction from the inner edge of the brake band of the same disc brake disc. [Figure 18] FIG. 18 shows diagrammatically a cross-sectional view of a detail of a further disc brake disc in a plane passing through the centre line of a ventilation duct according to a further embodiment and a corresponding view in radial direction from the inner edge of the brake band of the same disc brake disc.

[0042] [Figure 19] FIG. 19 shows diagrammatically a cross-sectional view of a detail of a further disc brake disc in a plane passing through the centre line of the ventilation duct according to a further embodiment and a corresponding view in radial direction from the inner edge of the brake band of the same disc brake disc. [Figure 20] FIG. 20 shows diagrammatically a cross-sectional view of a detail of a further disc brake disc in a plane passing through the centre line of the ventilation duct according to a further embodiment and a corresponding view in radial direction from the inner edge of the brake band of the same disc brake disc.

[0043] [Figure 21]FIG. 21 shows diagrammatically a cross-sectional view of a detail of a further disc brake disc in a plane passing through the centre line of a ventilation duct according to a further embodiment and a corresponding view in radial direction from the inner edge of the brake band of the same disc brake disc. [Figure 22] FIG. 22 shows diagrammatically a cross-sectional view of a detail of a further disc brake disc in a plane passing through the centre line of a ventilation duct according to a further embodiment and a corresponding view in radial direction from the inner edge of the brake band of the same disc brake disc.

[0044] [Figure 23] FIG. 23 shows diagrammatically a cross-sectional view of a detail of a further disc brake disc in a plane passing through the centre line of the ventilation duct according to a further embodiment and a corresponding view in a radial direction from the inner edge of the brake band of the same disc brake disc. [Figure 24] FIG. 24 shows diagrammatically a cross-sectional view of a detail of a further disc brake disc in a plane passing through the centre line of the ventilation duct according to a further embodiment and a corresponding view in a radial direction from the inner edge of the brake band of the same disc brake disc.

[0045] [Diagram 25] FIG. 25 is a cross-sectional view of a detail of a disc brake disc according to a plane passing through the axis of rotation of the disc brake disc according to a further embodiment, in which the bell is connected to the brake band.

[0046] [Figure 26] FIG. 26 shows a detail of a disc brake disc in a cross-section taken along a plane passing through the axis of rotation of the disc brake disc according to a further embodiment, in which the bell is connected to the brake band.

[0047] [Figure 27]FIG. 27 shows a detail of a disc brake disc in a cross-section through a plane passing through the axis of rotation of the disc brake disc according to a further embodiment, in which the bell is connected to the brake band. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0048] Description of Some Preferred Embodiments

[0049] According to a general embodiment, a braking device is provided.

[0050] According to a general embodiment, a brake band 1 of a brake disc of a disc brake has a band body 2 adapted to rotate about an axis of rotation XX.

[0051] The rotational axis defines an axial direction AA that is coincident with or parallel to the rotational axis XX, a radial direction RR that is perpendicular to the rotational axis XX and perpendicular to any axial direction AA incident on the radial direction RR, and a circumferential direction CC that is perpendicular to both the axial direction AA and the radial direction RR at any intersection point.

[0052] The braking band 1 has two opposing plates 3,4 defining opposing braking surfaces 5,6 and substantially flat opposing inner surfaces 8,9, with a ventilation duct 7 defined by the substantially flat opposing inner surfaces 8,9 between the plates 3,4.

[0053] Said ventilation duct 7 has a given radial ventilation duct extension 10 extending in a radial direction RR from a band inner edge 11 to a band outer edge 12 .

[0054] The plates 3, 4 are connected to each other by pins 13, 14.

[0055] Each of the pins 13,14 has a radial pin extension 15,16 that is smaller in size than the radial ventilation duct extension 10.

[0056] Close to the inner band edge 11 at least a first inclined boss 17 projects from at least one of the facing inner surfaces 8,9 towards the inside of the ventilation duct 7 without reaching the facing inner surfaces 9,8.

[0057] The at least a first oblique boss 17 forms a constriction in the ventilation duct 7 .

[0058] The at least first inclined boss 17 has an elongated extension along a first boss direction B1.

[0059] The first boss direction B1 is inclined with respect to the radial direction RR, and is also inclined with respect to the circumferential direction CC which forms a first acute angle A1 with the radial direction RR.

[0060] Adjacent to the inner side of the band-shaped edge portion 11, at least a second inclined boss 18 protrudes from at least one of the opposing inner surfaces 8, 9 toward the inside of the ventilation duct 7 without reaching the opposing inner surfaces 9, 8, and the at least second inclined boss 18 forms a narrowing in the ventilation duct 7.

[0061] The at least second inclined boss 18 extends elongatedly along a second boss direction B2.

[0062] The second boss direction B2 is inclined with respect to the radial direction RR, and is also inclined with respect to the circumferential direction CC which forms a second acute angle A1 with the radial direction RR.

[0063] The inclination of the second boss direction B2 with respect to the radial direction RR is opposite to the inclination of the first boss direction B1 with respect to the same radial direction RR.

[0064] According to an embodiment, said at least second oblique boss 18 projects from the same inner surface 8 or 9 of said at least first oblique boss 17 .

[0065] According to the embodiment, the at least second inclined boss 18 faces the at least first inclined boss 17 in the circumferential direction CC.

[0066] According to an embodiment, a radial connection extension 19 is interposed in the circumferential direction CC between the at least second inclined boss 18 and the at least first inclined boss 17, which connects the brake band to a drive bell 20 adapted to connect the brake band to a stub axle of a vehicle.

[0067] According to an embodiment, said at least second oblique boss 18 projects from an inner surface 9 or 8 opposite to the inner surface 8 or 9 from which said at least first oblique boss 17 projects.

[0068] According to an embodiment, the first inclined boss 17 is a plurality of first inclined bosses 17 .

[0069] The second inclined boss 18 is a plurality of second inclined bosses 18 .

[0070] Each of the second inclined bosses 18 protrudes from an inner surface 9 or 8 opposite to the inner surface 8 or 9 from which each of the first inclined bosses 17 protrudes.

[0071] According to the embodiment, the first inclined boss 17 is a plurality of first inclined bosses 17 .

[0072] The second inclined boss 18 is a plurality of second inclined bosses 18 .

[0073] Each second angled boss 18 projects from the same inner surface 8 or 9 of each first angled boss 17 .

[0074] According to an embodiment, said at least first angled boss 17 and said at least second angled boss 18 form a "V" shape.

[0075] According to an embodiment, said at least first inclined boss 17 and said at least second inclined boss 18 form a "V" shape whose end portions facing the inner band edge 11 are joined by joining said end portions.

[0076] According to an embodiment, the at least first inclined boss 17 and the at least second inclined boss 18 form a "V" shape whose ends are joined, and a boss pin 22 is provided between the at least first inclined boss 17 and the at least second inclined boss 18, joining the two opposing plates 3, 4.

[0077] According to an embodiment, the at least first inclined boss 17 and the at least second inclined boss 18 form a "V" shape with their ends joined, and a boss pin 22 joining the two opposing plates 3, 4 is provided between the first inclined boss 17 and the at least second inclined boss 18, and the boss pin 22 partially passes through the at least first inclined boss 17 and the at least second inclined boss 18.

[0078] According to the embodiment, the at least first inclined boss 17 and the at least second inclined boss 18 are spaced apart from each other to form a boss passage 21, and the extension of the ventilation duct 7 in the direction of the axis AA in the boss passage 21 expands until it reaches the opposing plate inner surfaces 8, 9.

[0079] According to an embodiment, the disc brake disc 23 is composed of a brake band 1 according to any one of the above-mentioned embodiments and a driving bell 20 .

[0080] According to an embodiment, the pins 13, 14 connecting the two plates 3, 4 to one another are arranged in the ventilation duct 7 in a pentagonal fashion.

[0081] According to an embodiment, the pins 13, 14 connecting the two plates 3, 4 to one another and the parts of the radial connecting extensions 19 are arranged in a pentagonal pattern within the ventilation duct 7.

[0082] According to an embodiment, the cross section of said at least one oblique boss 17, 18 in a plane containing the radial direction RR and the circumferential direction CC is rhomboidal. The air flow entering the ventilation duct is promoted by this rhomboid shape.

[0083] According to the embodiment, the cross section of the at least one inclined boss 17, 18 in a plane including the radial direction RR and the circumferential direction CC is in the shape of a rounded rhombus and is elongated with a drop.

[0084] According to an embodiment, the at least first and / or second inclined boss 17, 18 is elongated along a boss direction B1 and / or B2, which is directed towards the radially inner end of the pin 14 which is most adjacent to the inclined boss 17, 18. Ventilation in the ventilation duct 7 is further enhanced by this aligned inclination between the inclined boss 17, 18 and the pin 14.

[0085] According to the embodiment, the pins 13, 14 and the bosses 17, 18 are arranged side by side in the circumferential direction.

[0086] According to the embodiment, there are sixteen pins 13, 14 and bosses 17, 18 in each row.

[0087] According to a typical embodiment, said disc brake disc 30 further comprises at least one braking band 1 .

[0088] The brake band 1 has a band body 2 adapted to rotate about an axis of rotation XX which defines an axial direction AA coinciding with or parallel to the axis of rotation XX, a radial direction RR orthogonal to an arbitrary axial direction AA perpendicular to the axis of rotation XX and incident on the radial direction RR, and a circumferential direction CC perpendicular to both the axial direction AA and the radial direction RR at an arbitrary intersection point.

[0089] The braking band 1 has two opposing plates 3,4 defining opposing braking surfaces 5,6 and substantially flat opposing inner surfaces 8,9, and a ventilation duct 7 defined by the substantially flat opposing inner surfaces 8,9 is provided between the plates 3,4.

[0090] Said ventilation duct 7 has a given radial ventilation duct extension 10 extending in a radial direction RR from an inner band edge 11 to an outer band edge 12 .

[0091] The plates 3, 4 are connected to each other by pins 13, 14.

[0092] Each of the pins 13,14 has a radial pin extension 15,16 that is smaller in size than the radial ventilation duct extension 10.

[0093] The disc brake 30 further comprises a drive bell 20 adapted to connect to a stub axle of a vehicle.

[0094] The ventilation duct 7 is provided with at least one radial connecting extension 19 which connects the two opposing plates 3, 4 and connects the brake band 1 to the driving bell 20 so as to integrate the brake band 1 and the driving bell 20.

[0095] The at least one radial connecting extension 19 has a radial connecting extension longitudinal extension 23 which is smaller than the radial ventilation duct extension 10 and keeps the pins 15, 14 at least partially opposed to each other in the circumferential direction CC.

[0096] The at least one radial connecting extension 19 faces, on one part thereof and on both sides in the circumferential direction CC, two axial through windows 24 which are through openings oriented in the axial direction AA and both communicate with the ventilation duct 7.

[0097] According to an embodiment, the drive bell 20 has at least two bell window faces 25 extending in the circumferential direction and each facing one of said two axial through windows 24 .

[0098] According to an embodiment, at least one of the at least two bell window surfaces 25 is inclined with respect to the axial direction AA and the radial direction RR such that the shape of at least one of the two axial through windows 24 extends transversely to the axial direction AA passing from one side of the disc brake disc 30 towards the other side of the disc brake disc 30.

[0099] According to an embodiment, at least one of the at least two bell window surfaces 25 is inclined with respect to the axial direction AA and the radial direction RR, and the shape of at least one of the two axial through windows 24 extends transversely in the axial direction AA passing from one plate 3 or 4 to the other plate 4 or 3.

[0100] According to one embodiment, the disc brake disc 30 has a plurality of radial bell connection extensions 19 that are distributed in the circumferential direction and define a plurality of axial through windows 24 .

[0101] A bell window surface 25 is located between each radial extension 19 and an adjacent radial extension 19, the bell window surfaces 25 extending in the circumferential direction, and each of the bell window surfaces 25 facing one of the axial through windows 24.

[0102] According to one embodiment, said driving bell 20 has a bell connection part 26 facing said brake band 1 in a radial direction RR, said bell connection part 26 here having at least one circumferential channel 29 forming a channel in said bell connection part 26.

[0103] According to one embodiment, said driving bell 20 has a bell connection part 26 facing said brake band 1 in a radial direction RR, said bell connection part 26 now having two circumferential channels 29 forming two channels in said bell connection part 26.

[0104] According to one embodiment, the driving bell 20 has a bell connection 26 facing the brake band area 1 in the radial direction RR, whereby the bell connection 26 has at least one circumferential bell rib 31 protruding towards the ventilation duct 7 avoiding contact with the plates 3, 4.

[0105] According to one embodiment, the driving bell 20 has a bell connection 26 facing the brake band 1 in the radial direction RR, whereby the bell connection 26 has at least one circumferential bell rib 31 which projects into the ventilation duct 7 avoiding contact with the plates 3, 4.

[0106] According to an embodiment, the driving bell 20 has a bell connection part 26 facing the brake band 1 in the radial direction RR. Here, the bell connection part 26 has at least one circumferential bell rib 31 which penetrates and projects into the ventilation duct 7 while remaining protruding.

[0107] According to an embodiment, the at least one circumferential bell rib 31 connects to the bell connector 26 .

[0108] According to an embodiment, said at least one circumferential bell rib 31 is of blunt or rounded shape.

[0109] According to an embodiment, the driving bell 20 comprises a bell connection part 26 facing the brake band 1 in a radial direction RR, the bell connection part 26 comprising at least one circumferential channel 29 forming a channel in the bell connection part 26.

[0110] The at least one circumferential bell rib 31 connects and runs alongside the at least one circumferential channel 29 .

[0111] According to one embodiment, the disc brake disc 30 comprises a side of the disc brake disc 30 facing a vehicle wheel or wheel side and a side of the disc brake disc 30 facing a vehicle or vehicle side.

[0112] The bell connector 26 having a circumferential bell rib 31 defines two opposing ventilation duct access openings 32, 33, a first opening 32 opening from the wheel side of the disc brake disc 30 and a second opposing opening 33 opening from the vehicle side of the disc brake disc 30.

[0113] According to the embodiment, the first opening 32 opening from the wheel side of the disc brake disc 30 has a smaller opening dimension than the second opposing opening 33 opening from the vehicle side of the disc brake disc 30.

[0114] According to an embodiment, the driving bell 20 comprises a bell connection part 26 facing the brake band 1 in the radial direction RR, the bell connection part 26 comprising at least one circumferential channel 29 forming a groove in the bell connection part 26.

[0115] The first opening 32 opening from the wheel side of the disc brake disc 30 is defined by the at least one circumferential channel 29 and the at least one circumferential bell rib 31 .

[0116] According to an embodiment, at least one of the ventilation duct access openings 32 in the axial through window 24 is created by chip removal.

[0117] According to a typical embodiment, said disc brake disc 30 further comprises at least one braking band 1 .

[0118] The brake band 1 has a band body 2 adapted to rotate about a rotation axis XX which defines an axial direction AA coinciding with or parallel to the rotation axis XX, a radial direction RR perpendicular to an arbitrary axial direction AA perpendicular to the rotation axis XX and incident on the radial direction RR, and a circumferential direction CC perpendicular to both the axial direction AA and the radial direction RR at an arbitrary intersection point.

[0119] The braking band 1 has two opposing plates 3,4 defining opposing braking surfaces 5,6 and substantially flat opposing inner surfaces 8,9, with a ventilation duct 7 defined by the substantially flat opposing inner surfaces 8,9 between the plates 3,4.

[0120] Said ventilation duct 7 has a given radial ventilation duct extension 10 extending in a radial direction RR from an inner band edge 11 to an outer band edge 12 .

[0121] The plates 3, 4 are connected to each other by pins 13, 14.

[0122] Each of the pins 13 , 14 has a radial pin extension 15 , 16 that is smaller in size than the radial ventilation duct extension 10 .

[0123] The disc brake 30 further comprises a drive bell 20 adapted to connect to a stub axle of a vehicle.

[0124] The ventilation duct 7 is provided with at least one radial connecting extension 19 which connects the two opposing plates 3, 4 and connects the brake band 1 to the driving bell 20 so as to integrate the brake band 1 and the driving bell 20.

[0125] The at least one radial connecting extension 19 has a radial connecting extension longitudinal extension 23 that is smaller than the radial ventilation duct extension 10 and leaves the pins 15, 14 at least partially opposite each other in the circumferential direction CC.

[0126] The at least one radial connecting extension 19 faces, on one part thereof and on both sides in the circumferential direction CC, two axial through windows 24 which are through openings oriented in the axial direction AA and both communicate with the ventilation duct 7.

[0127] Adjacent to the inner side of the band-shaped edge portion 11, at least a first inclined boss 17 protrudes from at least one of the opposing inner surfaces 9, 8 toward the inside of the ventilation duct 7 without reaching the opposing inner surfaces 8, 9, and the at least first inclined boss 17 forms a narrowing in the ventilation duct 7.

[0128] The at least first inclined boss 17 has an elongated extension along a first boss direction B1.

[0129] The first boss direction B1 is inclined with respect to the radial direction RR, and is also inclined with respect to the circumferential direction CC which forms a first acute angle A1 with the radial direction RR.

[0130] According to one embodiment, close to the inner band edge 11, at least a second inclined boss 18 projects from at least one of the opposing inner surfaces 8, 9 towards the inside of the ventilation duct 7 without reaching said opposing inner surfaces 9, 8, said at least a second inclined boss 18 forming a constriction in the ventilation duct 7.

[0131] The at least second inclined boss 18 has an elongated extension along a second boss direction B2.

[0132] The second boss direction B2 is inclined with respect to the radial direction RR, and is also inclined with respect to the circumferential direction CC which forms a second acute angle A1 with the radial direction RR.

[0133] The inclination of the second boss direction B2 with respect to the radial direction RR is opposite to the inclination of the first boss direction B1 with respect to the same radial direction RR.

[0134] According to one embodiment, the disc brake disc 30 comprises a plurality of radial bell connection extensions 19 distributed in the circumferential direction and defining a plurality of axial through windows 24 .

[0135] According to an embodiment, at least one pin 14 has at least one pin foot extending circumferentially and radially away from said pin 14, forming a height relative to the inner surfaces 8, 9 and thus narrowing the width of the ventilation duct 7. According to one embodiment, in a view along the axial direction AA, said pin foot has a radially extending shape, for example having a radius in the circumferential direction and a radius which extends more in the radial direction RR.

[0136] According to a typical embodiment, said disc brake disc 30 further comprises at least one braking band 1 .

[0137] The brake band 1 has a band body 2 adapted to rotate about an axis of rotation XX which defines an axial direction AA coinciding with or parallel to the axis of rotation XX, a radial direction RR orthogonal to an arbitrary axial direction AA perpendicular to the axis of rotation XX and incident on the radial direction RR, and a circumferential direction CC perpendicular to both the axial direction AA and the radial direction RR at an arbitrary intersection point.

[0138] The braking band 1 has two opposing plates 3,4 defining opposing braking faces 5,6 and opposing substantially flat inner surfaces 8,9.

[0139] A ventilation duct 7 defined by said opposing substantially flat inner surfaces 8,9 is provided between said plates 3,4.

[0140] Said ventilation duct 7 has a given radial ventilation duct extension 10 extending in a radial direction RR from an inner band edge 11 to an outer band edge 12 .

[0141] The disc brake 30 further comprises a drive bell 20 adapted to connect to a stub axle of a vehicle.

[0142] The driving bell 20 is connected to the brake band 1 .

[0143] Between the brake band 1 and the driving bell 20 there is provided an axial through window 24 which is a through opening oriented in the axial direction AA and communicating with the ventilation duct 7 .

[0144] The driving bell 20 has a bell connection part 26 facing the brake band 1 in the radial direction RR.

[0145] The bell connection 26 has at least one circumferential bell rib 31 which projects towards the ventilation duct 7 avoiding contact with the plates 3,4.

[0146] According to an embodiment, said plates 3,4 are connected to each other by pins 13,14.

[0147] Each of the pins 13 , 14 has a radial pin extension 15 , 16 that is smaller in size than the radial ventilation duct extension 10 .

[0148] According to an embodiment, the ventilation duct 7 is provided with at least one radial connecting extension 19 which connects the two opposing plates 3, 4 and connects the brake band 1 to the driving bell 20 so that the brake band 1 and the driving bell 20 are integral.

[0149] The at least one radial connecting extension 19 has a radial connecting extension longitudinal extension 23 which is smaller than the radial ventilation duct extension 10 and keeps the pins 15, 14 at least partially opposed to each other in the circumferential direction CC.

[0150] The at least one radial connecting extension 19 faces, on a part thereof and on both sides in the circumferential direction CC, two axial through windows 24 which are through openings oriented in the axial direction AA and communicate with the ventilation duct 7.

[0151] According to one embodiment, the driving bell 20 has a bell connection 26 facing the brake band 1 in the radial direction RR, whereby the bell connection 26 has the at least one circumferential bell rib 31 projecting into the ventilation duct 7 avoiding contact with the plates 3, 4.

[0152] According to one embodiment, the driving bell 20 has a bell connection 26 facing the brake band 1 in the radial direction RR. The bell connection 26 has at least one circumferential bell rib 31 which projects into the ventilation duct 7 while remaining embedded therein.

[0153] According to an embodiment, the at least one circumferential bell rib 31 connects to the bell connector 26 .

[0154] According to an embodiment, said at least one circumferential bell rib 31 is of blunt or rounded shape.

[0155] According to an embodiment, the driving bell 20 comprises a bell connection part 26 facing the brake band 1 in a radial direction RR, the bell connection part 26 comprising at least one circumferential channel 29 forming a channel in the bell connection part 26.

[0156] The at least one circumferential bell rib 31 connects and parallels the at least one circumferential channel 29 .

[0157] According to an embodiment, the disc brake disc 30 comprises a side of the disc brake disc 30 facing a vehicle wheel or a wheel side, and a side of the disc brake disc 30 facing a vehicle or a vehicle side.

[0158] The bell connector 26 having a circumferential bell rib 31 defines two opposing ventilation duct access openings 32, 33, a first opening 32 opening from the wheel side of the disc brake disc 30 and a second opposing opening 33 opening from the vehicle side of the disc brake disc 30.

[0159] According to the embodiment, the first opening 32 opening from the wheel side of the disc brake disc 30 has a smaller opening dimension than the second opposing opening 33 opening from the vehicle side of the disc brake disc 30.

[0160] According to an embodiment, the driving bell 20 comprises a bell connection part 26 facing the brake band 1 in the radial direction RR, the bell connection part 26 comprising at least one circumferential channel 29 forming a groove in the bell connection part 26.

[0161] The first opening 32 opening from the wheel side of the disc brake disc 30 is defined by the at least one circumferential channel 29 and the at least one circumferential bell rib 31 .

[0162] According to one embodiment, the disc brake disc 30 comprises a plurality of radial bell connection extensions 19 .

[0163] The radial bell connection extensions 19 are circumferentially distributed and define a plurality of axial through windows 24 , with a circumferential bell rib 31 between each radial extension 19 and an adjacent radial extension 19 .

[0164] In order to meet specific contingency needs, those skilled in the art can make some modifications and adaptations to the above-described embodiments and substitute other elements that are functionally equivalent, without, however, departing from the scope of the following claims.

[0165] According to an embodiment, the disc brake disc 30 includes:

[0166] Brake band 1

[0167] The brake band 1 comprises a band body 2 adapted to rotate about an axis of rotation XX which defines an axial direction AA coinciding with or parallel to the axis of rotation XX, a radial direction RR orthogonal to an arbitrary axial direction AA perpendicular to the axis of rotation XX and incident on the radial direction RR, and a circumferential direction CC perpendicular to both the axial direction AA and the radial direction RR at an arbitrary intersection point.

[0168] The braking band 1 has two opposing plates 3,4 defining opposing braking surfaces 5,6 and substantially flat opposing inner surfaces 8,9. A ventilation duct 7 defined by the substantially flat opposing inner surfaces 8,9 is provided between the plates 3,4.

[0169] Said ventilation duct 7 has a given radial ventilation duct extension 10 extending in a radial direction RR from an inner band edge 11 to an outer band edge 12 .

[0170] The plates 3, 4 are connected to each other by pins 13, 14.

[0171] Each of the pins 13 , 14 has a radial pin extension 15 , 16 that is smaller in size than the radial ventilation duct extension 10 .

[0172] and,

[0173] The disc brake 30 further comprises a drive bell 20 adapted to connect to a stub axle of a vehicle.

[0174] and,

[0175] Within the ventilation duct 7 there is at least one radial connecting extension 19 which connects the two opposing plates 3, 4 and which connects the brake band 1 to the driving bell 20 so that the brake band 1 and the driving bell 20 are integral.

[0176] The at least one radial connecting extension 19 has a radial connecting extension longitudinal extension 23 which is smaller than the radial ventilation duct extension 10 and keeps the pins 15, 14 at least partially opposed in the circumferential direction CC.

[0177] and,

[0178] The at least one radial connecting extension 19, on its part and on both sides oriented in the circumferential direction CC, faces two axial through windows 24 which are through openings oriented in the axial direction AA and both communicate with the ventilation duct 7.

[0179] Close to the inner band edge 11, at least a first inclined boss 17 projects from at least one of the opposing inner faces 9,8 towards the inside of the ventilation duct 7 without reaching the opposing inner faces 8,9. The at least a first inclined boss 17 forms a constriction in the ventilation duct 7.

[0180] The at least first inclined boss 17 has an elongated extension along a first boss direction B1.

[0181] The first boss direction B1 is inclined with respect to the radial direction RR, and is also inclined with respect to the circumferential direction CC which forms a first acute angle A1 with the radial direction RR.

[0182] According to an embodiment, close to the inner band edge 11, at least a second inclined boss 18 protrudes from at least one of the opposing inner surfaces 8, 9 towards the inside of the ventilation duct 7 without reaching said opposing inner surfaces 9, 8, said at least a second inclined boss 18 forming a constriction in the ventilation duct 7.

[0183] The at least second inclined boss 18 has an elongated extension along a second boss direction B2.

[0184] The second boss direction B2 is inclined with respect to the radial direction RR, and is also inclined with respect to the circumferential direction CC that forms a second acute angle A1 with the radial direction RR.

[0185] and,

[0186] The inclination of the second boss direction B2 with respect to the radial direction RR is opposite to the inclination of the first boss direction B1 with respect to the same radial direction RR.

[0187] According to an embodiment, said at least second oblique boss 18 projects from the same inner surface 8 or 9 of said at least first oblique boss 17 .

[0188] and / or

[0189] The at least second inclined boss 18 faces the at least first inclined boss 17 in the circumferential direction CC.

[0190] According to an embodiment, a radial connection extension 19 is interposed in the circumferential direction CC between the at least second inclined boss 18 and the at least first inclined boss 17, which connects the brake band to a drive bell 20 adapted to connect the brake band to a stub axle of a vehicle.

[0191] According to an embodiment, said at least second oblique boss 18 projects from the inner surface 9 or 8 opposite to the inner surface 8 or 9 from which said at least first oblique boss 17 projects.

[0192] According to an embodiment, the first inclined boss 17 is a plurality of first inclined bosses 17 .

[0193] The second inclined boss 18 is a plurality of second inclined bosses 18 .

[0194] and,

[0195] Each of the second inclined bosses 18 projects from an inner surface 9 or 8 opposite to the inner surface 8 or 9 from which each of the first inclined bosses 17 projects.

[0196] or

[0197] The first inclined boss 17 is a plurality of first inclined bosses 17 .

[0198] The second inclined boss 18 is a plurality of second inclined bosses 18 .

[0199] Each second angled boss 18 projects from the same inner surface 8 or 9 of each first angled boss 17 .

[0200] According to an embodiment, said at least first angled boss 17 and said at least second angled boss 18 form a "V" shape.

[0201] or

[0202] The at least first angled boss 17 and the at least second angled boss 18 form a joined "V" shape with their ends facing the band inner edge 11.

[0203] or

[0204] The at least first inclined boss 17 and the at least second inclined boss 18 form a "V" shape with their ends joined, and a boss pin 22 is provided between the at least first inclined boss 17 and the at least second inclined boss 18.

[0205] or

[0206] The at least first inclined boss 17 and the at least second inclined boss 18 form a "V" shape with their ends joined. A boss pin 22 that joins the plates 3, 4 is provided between the at least first inclined boss 17 and the at least second inclined boss 18. The boss pin 22 also partially passes through the at least first inclined boss 17 and the at least second inclined boss 18.

[0207] According to one embodiment, the disc brake disc 30 comprises a plurality of radial bell connection extensions 19 distributed in the circumferential direction and defining a plurality of axial through windows 24 .

[0208] According to one embodiment, said driving bell 20 has a bell connection 26 facing said brake band 1 in a radial direction RR. Said bell connection 26 has at least one circumferential bell rib 31 which projects towards the ventilation duct 7 avoiding contact with the plates 3, 4.

[0209] According to an embodiment, the disc brake disc 30 includes:

[0210] Brake band 1.

[0211] The brake band 1 comprises a band body 2 adapted to rotate about an axis of rotation XX which defines an axial direction AA coinciding with or parallel to the axis of rotation XX, a radial direction RR perpendicular to an arbitrary axial direction AA perpendicular to the axis of rotation XX and incident on the radial direction RR, and a circumferential direction CC perpendicular to both the axial direction AA and the radial direction RR at an arbitrary intersection point.

[0212] The braking band 1 has two opposing plates 3,4 defining opposing braking surfaces 5,6 and substantially flat opposing inner surfaces 8,9. A ventilation duct 7 defined by the substantially flat opposing inner surfaces 8,9 is provided between the plates 3,4.

[0213] Said ventilation duct 7 has a given radial ventilation duct extension 10 extending in a radial direction RR from an inner band edge 11 to an outer band edge 12 .

[0214] and,

[0215] The disc brake 30 further includes a drive bell 20 adapted to couple to a stub axle of a vehicle.

[0216] The driving bell 20 is connected to the brake band 1 .

[0217] Where:

[0218] Between the brake band 1 and the driving bell 20 there is provided an axial through window 24 which is a through opening oriented in the axial direction AA and communicates with the ventilation duct 7 .

[0219] The drive bell 20 has a bell connection portion 26 facing the brake band 1 in the radial direction RR.

[0220] The bell connection 26 has at least one circumferential bell rib 31 which projects towards the ventilation duct 7 avoiding contact with the plates 3,4.

[0221] According to an embodiment, said plates 3,4 are connected to each other by pins 13,14.

[0222] Each of the pins 13 , 14 has a radial pin extension 15 , 16 that is smaller in size than the radial ventilation duct extension 10 .

[0223] According to an embodiment, the ventilation duct 7 is provided with at least one radial connecting extension 19 which connects the two opposing plates 3, 4 and connects the brake band 1 to the driving bell 20 such that the brake band 1 and the driving bell 20 are integral.

[0224] The at least one radial connecting extension 19 has a radial connecting extension longitudinal extension 23 which is smaller than the radial ventilation duct extension 10 such that the pins 15, 14 remain at least partially opposite each other in the circumferential direction CC.

[0225] The at least one radial connecting extension 19, on its part and on both sides oriented in the circumferential direction CC, faces two axial through windows 24 which are through openings oriented in the axial direction AA and communicate with the ventilation duct 7.

[0226] According to one embodiment, the driving bell 20 has a bell connection 26 facing the brake band 1 in a radial direction RR, whereby the bell connection 26 has the at least one circumferential bell rib 31 projecting into the ventilation duct 7 avoiding contact with the plates 3, 4.

[0227] According to an embodiment, the driving bell 20 has a bell connection 26 facing the brake band 1 in the radial direction RR. The bell connection 26 has at least one circumferential bell rib 31 which penetrates and projects into the ventilation duct 7.

[0228] According to an embodiment, the at least one circumferential bell rib 31 connects to the bell connector 26 .

[0229] or

[0230] The at least one circumferential bell rib 31 is blunt or rounded in shape.

[0231] According to one embodiment, said driving bell 20 has a bell connection part 26 facing said brake band 1 in a radial direction RR, said bell connection part 26 here having at least one circumferential channel 29 forming a channel in said bell connection part 26.

[0232] The at least one circumferential bell rib 31 connects and runs alongside the at least one circumferential channel 29 .

[0233] According to one embodiment, the disc brake disc 30 comprises a side of the disc brake disc 30 facing a vehicle wheel or wheel side and a side of the disc brake disc 30 facing a vehicle or vehicle side.

[0234] The bell connector 26 having a circumferential bell rib 31 defines two opposing ventilation duct access openings 32, 33, a first opening 32 opening from the wheel side of the disc brake disc 30 and a second opposing opening 33 opening from the vehicle side of the disc brake disc 30.

[0235] According to the embodiment, the first opening 32 opening from the wheel side of the disc brake disc 30 has a smaller opening size than the second opposite opening 33 opening from the vehicle side of the disc brake disc 30.

[0236] and / or

[0237] The driving bell 20 has a bell connection part 26 facing the brake band 1 in a radial direction RR, the bell connection part 26 including at least one circumferential channel 29 forming a channel in the bell connection part 26 .

[0238] The first opening 32 opening from the wheel side of the disc brake disc 30 is defined by the at least one circumferential channel 29 and the at least one circumferential bell rib 31 .

[0239] According to one embodiment, the disc brake disc 30 comprises a plurality of radial bell connection extensions 19 distributed in the circumferential direction and defining a plurality of axial through windows 24, with a circumferential bell rib 31 between each radial extension 19 and the adjacent radial extension 19.

[0240] According to an embodiment, there is a brake band 1 for a brake disc of a disc brake.

[0241] The brake band 1 comprises a band body 2 adapted to rotate about an axis of rotation XX which defines an axial direction AA coinciding with or parallel to the axis of rotation XX, a radial direction RR perpendicular to the axis of rotation XX and perpendicular to any axial direction AA incident on the radial direction RR, and a circumferential direction CC perpendicular to both the axial direction AA and the radial direction RR at any intersection point.

[0242] The braking band 1 has two opposing plates 3,4 defining opposing braking surfaces 5,6 and substantially flat opposing inner surfaces 8,9, and a ventilation duct 7 defined by the substantially flat opposing inner surfaces 8,9 is provided between the plates 3,4.

[0243] Said ventilation duct 7 has a given radial ventilation duct extension 10 extending in a radial direction RR from an inner band edge 11 to an outer band edge 12 .

[0244] The plates 3, 4 are connected to each other by pins 13, 14.

[0245] Each of the pins 13 , 14 has a radial pin extension 15 , 16 that is smaller in size than the radial ventilation duct extension 10 .

[0246] and,

[0247] Near the inner band edge 11, at least a first inclined boss 17 projects from at least one of the opposing inner surfaces 9, 8 towards the inside of the ventilation duct 7 without reaching said opposing inner surfaces 8, 9. The at least a first inclined boss 17 forms a constriction in the ventilation duct 7.

[0248] The at least first inclined boss 17 has an elongated extension along a first boss direction B1.

[0249] The first boss direction B1 is inclined with respect to the radial direction RR, and is also inclined with respect to the circumferential direction CC that forms a first acute angle A1 with the radial direction RR.

[0250] Adjacent to the inner band edge 11, at least a second inclined boss 18 projects from at least one of the opposing inner surfaces 8, 9 towards the inside of the ventilation duct 7 without reaching the opposing inner surfaces 9, 8; the at least a second inclined boss 18 forms a constriction in the ventilation duct 7.

[0251] The at least second inclined boss 18 has an elongated extension along a second boss direction B2.

[0252] The second boss direction B2 is inclined with respect to the radial direction RR, and is also inclined with respect to the circumferential direction CC that forms a second acute angle A1 with the radial direction RR.

[0253] and,

[0254] The inclination of the second boss direction B2 with respect to the radial direction RR is opposite to the inclination of the first boss direction B1 with respect to the same radial direction RR.

[0255] According to an embodiment, said at least second oblique boss 18 projects from the same inner surface 8 or 9 of said at least first oblique boss 17 .

[0256] According to the embodiment, the at least second inclined boss 18 faces the at least first inclined boss 17 in the circumferential direction CC.

[0257] According to an embodiment, a radial connection extension 19 is interposed in the circumferential direction CC between the at least second inclined boss 18 and the at least first inclined boss 17, which connects the brake band to a drive bell 20 adapted to connect the brake band to a stub axle of a vehicle.

[0258] According to an embodiment, said at least second oblique boss 18 projects from the inner surface 9 or 8 opposite to the inner surface 8 or 9 from which said at least first oblique boss 17 projects.

[0259] According to an embodiment, the first inclined boss 17 is a plurality of first inclined bosses 17 .

[0260] The second inclined boss 18 is a plurality of second inclined bosses 18 .

[0261] and,

[0262] Each of the second inclined bosses 18 protrudes from an inner surface 9 or 8 opposite to the inner surface 8 or 9 from which each of the first inclined bosses 17 protrudes.

[0263] According to an embodiment, the first inclined boss 17 is a plurality of first inclined bosses 17 .

[0264] The second inclined boss 18 is a plurality of second inclined bosses 18 .

[0265] and,

[0266] Each second angled boss 18 projects from the same inner surface 8 or 9 of each first angled boss 17 .

[0267] According to an embodiment, the at least first angled boss 17 and the at least second angled boss 18 form a "V" shape.

[0268] or

[0269] The at least first inclined boss 17 and the at least second inclined boss 18 form a "V" shape whose end portions facing the inner band edge 11 are joined by joining said end portions.

[0270] or

[0271] The at least first inclined boss 17 and the at least second inclined boss 18 form a "V" shape with their ends joined, and a boss pin 22 is provided between the at least first inclined boss 17 and the at least second inclined boss 18 to join the two opposing plates 3, 4.

[0272] or

[0273] the at least first inclined boss 17 and the at least second inclined boss 18 form a "V" shape with their ends joined, a boss pin 22 joining the two opposing plates 3, 4 is provided between the first inclined boss 17 and the at least second inclined boss 18, and the boss pin 22 partially penetrates the at least first inclined boss 17 and the at least second inclined boss 18.

[0274] According to one embodiment, the at least first inclined boss 17 and the at least second inclined boss 18 are spaced apart from each other to form a boss passage 21, and the extension of the ventilation duct 7 in the boss passage 21 in the direction of the axis AA expands until it reaches the opposing plate inner surfaces 8, 9.

[0275] According to an embodiment, a disc brake disc 23 is composed of a brake band 1 according to any one of the above embodiments and a driving bell 20 . [Explanation of symbols]

[0276] List of References 1 Brake band 2 Band body 3. First Plate 4. Second Plate 5 First braking surface 6 Second braking surface 7. Ventilation Duct 8. First flat inner surface of first plate 9. Second flat inner surface of second plate 10 Radial ventilation duct extension 11 Inner band edge 12 Outer band edge 13 Outside rope pin 14 Inner rope pin 15 Radial extension of outer pin 16 Radial extension of inner pin 17 First inclined boss 18 Second inclined boss 19 Radial bell connection extension 20 Driving Bell 21 Boss Passage 22 Rope pin adjacent to inner band edge or boss pin 23 Longitudinal extension of radial connecting extension 24 Axial Through Window 25 Bell window surface 26 Bell connection part 29 Circumferential Channel 30 Disc brake disc 31 Circumferential Bell Ribs 32 Wheel side ventilation duct access opening 33 Vehicle side ventilation duct access opening AA Axial direction XX Rotation axis RR Radial CC circumferential direction B1 1st boss direction B2 2nd boss direction A1 First acute angle between the first boss direction and the radial direction A2: Second acute angle between the second boss direction and the radial direction

Claims

1. A disc brake disc (30) having a brake band (1), The brake band (1) comprises a band body (2) adapted to rotate around a rotation axis (X-X), The rotation axis (X-X) is an axial direction (A-A) that coincides with the rotation axis (X-X) or is parallel to the rotation axis (X-X); A radial direction (RR) perpendicular to the rotation axis (X-X), and a radial direction (RR) perpendicular to an arbitrary axial direction (A-A) incident on the radial direction (RR); defining a circumferential direction (C-C) perpendicular to both said axial direction (A-A) and said radial direction (R-R) at any intersection; The brake band (1) has two opposing plates (3, 4), the plates (3, 4) defining opposing braking surfaces (5, 6) and opposing substantially flat inner surfaces (8, 9); a ventilation duct (7) defined by the substantially flat opposing inner surfaces (8, 9) is provided between the plates (3, 4); said ventilation duct (7) having a predetermined radial ventilation duct extension (10) extending in said radial direction (R-R) from an inner band edge (11) to an outer band edge (12); The plates (3, 4) are connected to each other by a plurality of pins (13, 14), each of the plurality of pins (13, 14) having a radial pin extension (15, 16) that is smaller in size than the radial ventilation duct extension (10); The disc brake disc (30) further comprises a drive bell (20) adapted to connect to a stub axle of a vehicle; the ventilation duct (7) is provided with at least one radial connecting extension (19) connecting the plates (3, 4) and connecting the brake band (1) and the driving bell (20) so that the brake band (1) and the driving bell (20) are integral; said at least one radial connecting extension (19) having a longitudinal extension (23) of said radial connecting extension (19); the longitudinal extension (23) of said radial connecting extension (19) is smaller than the length of said radial ventilation duct extension (10), leaving said pins (15, 14) at least partially opposite each other in the circumferential direction (C-C); the at least one radial connecting extension (19) faces two axial through-windows (24) on a part of the radial connecting extension (19) and on both circumferentially oriented sides (C-C) of the radial connecting extension (19), A disc brake disc (30) wherein said two axial through windows (24) are oriented in said axial direction (AA) and communicate with said ventilation duct (7).

2. The driving bell (20) has at least two bell window faces (25), The disc brake disc (30) according to claim 1, characterized in that each of the at least two bell window surfaces (25) extends in the circumferential direction (C-C) and faces one of the two axial through windows (24).

3. At least one of the at least two bell window surfaces (25) is inclined with respect to the axial direction (A-A) and the radial direction (R-R); the shape of at least one of the two axial through windows (24) extends transversely in the axial direction (A-A) passing from one side of the disc brake disc (30) to the other side of the disc brake disc (30); or 3. The disc brake disc (30) according to claim 2, wherein the shape of at least one of the two axial through windows (24) extends transversely in the axial direction (A-A) from one plate (3 or 4) of the two opposing plates (3, 4) to the other plate (4 or 3).

4. The disc brake disc (30) comprises a plurality of radial bell connection extensions (19); the radial bell connection extensions (19) are distributed in the circumferential direction (C-C) and define a plurality of axial through windows (24); a bell window surface (25) between each of the plurality of radial connecting extensions (19) and an adjacent radial connecting extension (19); The bell window surface (25) extends in the circumferential direction (C-C), 2. The disc brake disc (30) according to claim 1, wherein each of the bell window surfaces (25) faces one of the axial through windows (24).

5. The drive bell (20) has a bell connecting portion (26) facing the brake band (1) in the radial direction (RR), The bell connector (26) comprises at least one circumferential channel (29) forming a channel within the bell connector (26). or The drive bell (20) has a bell connecting portion (26) facing the brake band (1) in the radial direction (RR), The bell connector (26) comprises two circumferential channels (29) that form two flow paths in the bell connector (26). The disc brake disc (30) of claim 1.

6. The drive bell (20) has a bell connecting portion (26) facing the brake band (1) in the radial direction (RR), the bell connection (26) has at least one circumferential bell rib (31) that projects towards the ventilation duct (7) avoiding contact with the plates (3, 4); or The drive bell (20) has a bell connecting portion (26) facing the brake band (1) in the radial direction (RR), the bell connection (26) has at least one circumferential bell rib (31) that projects into the ventilation duct (7) avoiding contact with the plates (3, 4); or, The drive bell (20) has a bell connecting portion (26) facing the brake band (1) in the radial direction (RR), The bell connection (26) has at least one circumferential bell rib (31) which projects into the ventilation duct (7) and remains overhanging. The disc brake disc (30) of claim 1.

7. The at least one circumferential bell rib (31) is connected to the bell connector (26). or the at least one circumferential bell rib (31) is blunt or rounded in shape; or, the bell connector (26) comprises at least one circumferential channel (29) forming a channel within the bell connector (26); the at least one circumferential bell rib (31) connects to and runs alongside the at least one circumferential channel (29); A disc brake disc (30) according to claim 6.

8. The disc brake disc (30) comprises a side of the disc brake disc (30) facing a vehicle wheel or wheel side, and a side of the disc brake disc (30) facing a vehicle or vehicle side, the bell connector (26) having the circumferential bell rib (31) defines two opposing ventilation duct access openings (32, 33); the two opposing ventilation duct access openings (32, 33) include a first opening (32) opening from the wheel side of the disc brake disc (30) and a second opposing opening (33) opening from the vehicle side of the disc brake disc (30); A disc brake disc (30) according to claim 6.

9. 9. The disc brake disc (30) according to claim 8, wherein the first opening (32) opening from the wheel side of the disc brake disc (30) has a smaller opening dimension than the second opposing opening (33) opening from the vehicle side of the disc brake disc (30).

10. The bell connector (26) comprises at least one circumferential channel (29) forming a channel in the bell connector (26); 7. The disc brake disc (30) according to claim 6, wherein the first opening (32) opening from the wheel side of the disc brake disc (30) is defined by the at least one circumferential channel (29) and the at least one circumferential bell rib (31).

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