Brake band, disc and vehicle comprising a disc for a disc brake

Abstract

A brake band for a disc of a disc brake, a disc for a disc brake, and a vehicle including a disc for a disc brake are provided. The brake band has first and second plates with first and second plate outer surfaces. Opposing portions of the first and second outer surfaces form opposing brake surfaces. The brake band has a plurality of attachment portions for connecting the brake band to a vehicle hub or bell. Each attachment portion has an attachment portion wall with opposing side wall portions, two bottom wall portions, an inner end wall portion, and opposing first and second attachment portion surfaces. Each side wall portion joins to an adjacent bottom wall portion by a cylindrical bottom arch that avoids a ridge. Each side wall portion joins to an adjacent inner end wall portion by a cylindrical end arch that avoids a ridge. Each first attachment portion surface is coplanar with the first brake surface unless the first brake surface is worn.

Description

Technical Field

[0001] This invention relates to brake bands and ventilated discs for disc brakes, and particularly, but not exclusively, to brake bands and ventilated discs for disc brakes used in automotive and / or industrial applications, and vehicles having said ventilated discs.

[0002] The present invention also relates to a disc brake disc, the disc including a brake band and a vehicle hub or bell-shaped element associated with and adapted to be connected to the vehicle hub.

[0003] The present invention also relates to vehicles including discs for disc brakes. Background Technology

[0004] In disc brakes, the brake calipers are typically arranged to straddle the outer periphery of the brake disc, which is adapted to rotate about an axis of rotation AA that defines the axial direction XX. Disc brakes also define: a radial direction RR orthogonal to the axial direction XX; a circumferential direction CC orthogonal to both the axial direction XX and the radial direction RR; and a tangential direction TT, locally or precisely at the intersection of the axial and radial directions, orthogonal to both the axial direction XX and the radial direction RR.

[0005] As is well known, a disc for a disc brake includes a bell-shaped element suitable for associating the disc with a vehicle wheel hub, and an annular portion, known as the brake band, extends from the vehicle wheel hub, the annular portion being designed to cooperate with the brake pads of the caliper. In the case of a ventilated disc, the brake band is made of two plates facing each other and connected to each other accordingly by connecting elements in the form of pillars or fins. The outer surfaces of the two plates define opposing braking surfaces, while the inner surfaces, together with the pillars or fins, define ventilation channels for cooling the disc, through which airflow passes in a centrifugal direction during the disc's rotational movement.

[0006] Brake bands are designed to work in conjunction with disc brake calipers, which are adapted to apply braking force to a vehicle by applying friction through the pads on opposite surfaces of two plates, known as the brake surfaces.

[0007] It is known that during brake operation, friction between the brake caliper pads and the brake band's braking surface generates a significant amount of heat, which needs to be addressed.

[0008] In fact, the heat generated causes serious undesirable phenomena, such as deformation of the brake band, cracks in the connection between the brake band and the bell, cracks on the brake surface, or localized changes in the state of the material forming the brake band, which in turn leads to the deterioration of the brake band.

[0009] In particular, in applications of high-performance motor vehicles or industrial vehicles with high braking efficiency, there is an even greater need to handle a considerable amount of energy and the heat generated during braking.

[0010] The ventilation discs of the type mentioned above have been continuously improved over time, especially in terms of the number and shape of the ventilation channels, thereby defining the gap formed by two plates facing each other in the axial direction.

[0011] Among known ventilation trays, the "column" tray has shown particular effectiveness in terms of heat treatment, i.e., cooling performance. In the "column" tray, the ventilation channel is internally defined by a connecting element that is specifically columnar, with limited or substantially insufficient radial and circumferential extensions relative to the axial extension of the connecting element, which can be defined as a "column" that laterally connects the two plates.

[0012] From EP 1373751 B1, a ventilated "column" disc is known, in which columnar sections are geometrically arranged along three concentric circles, which are coaxial with the disc and have different radii, thus forming three "stages". If the cross-section on the plane is parallel to the two plates and located in the middle relative to the two plates, the columnar sections have different types of cross-sections (e.g., columnar sections with "rhomboid" cross-sections on the middle and inner lines; columnar sections with "teardrop" cross-sections on the outer lines).

[0013] Other ventilation discs with a "column" structure can be identified from, for example, WO 2004 / 102028 and US 5,542,503.

[0014] The so-called "finned" or "winged" discs are known in ventilation discs, in which ventilation channels are defined internally by special connecting elements, which are elongated along the main direction, for example according to a direction parallel to the radial direction RR, or the connecting elements are helical and connect two plates in the transverse direction.

[0015] It is also known that the braking action provided by the pad against the brake surface of the disc generates heat, and under conditions of particularly demanding performance, the disc temperature increases to the point of incandescence. Due to the high temperatures reached by the disc during braking, the disc deforms, and the contact between the pad and the brake surface deteriorates. Furthermore, the friction material of the pad undergoes vitrification, and the disc material becomes contaminated.

[0016] Furthermore, it was found that the highest temperature was reached in the middle annular portion of the braking surface, specifically in the middle annular portion of the outer surface of the corresponding plate. Such areas are prone to cracking during disc use.

[0017] To avoid the above-mentioned drawbacks, it is necessary to improve the efficiency of dispersing the heat generated by braking in order to control the temperature reached by the disc during and after braking, and to increase the mechanical resistance of the middle part of the brake band.

[0018] Solutions are disclosed in WO 2004 / 102028, WO 2002 / 064992, US7066306, US7267210, US 2006 0243546, US 2004 0124047, US6367599, US5542503, and US4865167. While satisfactory from all angles, these solutions do not allow for a compromise between the mechanical resistance required in the central annular region of the brake band and the contrasting need to maximize airflow within the same region, which would otherwise eliminate the significant increase in localized temperature caused by braking.

[0019] However, it is worth noting that the above-described type of ventilated disc does not provide a solution to another problem briefly described below, which may affect disc brakes, especially disc brakes with ventilated discs, and which occurs simultaneously with the above-described problem and also needs to be addressed.

[0020] It is well known that commercial vehicles generate significant thermal gradients during long resistance cycles, such as when braking for extended periods downhill. Detailed analysis of the brake discs reveals uneven temperature distribution and variations over time.

[0021] In particular, brake disc models currently used in commercial vehicles are prone to damage at the connection between the brake band and the bell element, especially at the connection hole and the mating surface where it connects with the bell element. Damage or cracks may appear prematurely, especially when commercial vehicles undergo prolonged resistance cycles at low deceleration, often downhill. These damages, cracks, or splits are a direct consequence of improper heat distribution, leading to excessive thermal stress on the inner diameter of the brake band.

[0022] The primary cause of damage is the radial expansion of the brake band, with friction between the brake band and the brake pads leading to prolonged heating of the brake band. Because the area of ​​the brake band engaging with the bell-shaped element generates less heat than the portion of the brake band containing the braking surface, a localized high-temperature gradient is formed, resulting in cracks in the area adjacent to the connecting hole. Figure 8 shows a side view of a portion of the brake band in this field, where different shades of gray represent thermal gradients. As indicated by the forked arrow below the connecting hole, the thermal gradient causes deformation of the brake band, which tends to pull the portion below the connecting hole, sometimes even causing damage.

[0023] To avoid the aforementioned drawbacks, an attempt was made to insert open perforations radially between the connecting portions of the brake band, as shown in Figure 9. This allows for a reduction in the thermal gradient in this region of the brake band; however, as expected, the presence of open perforations increases stress at the damaged base, and in particular, the damage also affects the brake surface.

[0024] Therefore, a compromise needs to be reached between the ventilation channel formed by the gap between the two facing plates and the ventilation efficiency of the attachment part used to connect the brake band to the bell, and to prevent the thermal gradient caused by improved ventilation from putting excessive stress on the connection part used to connect the brake band to the bell and causing damage.

[0025] An attempt was made to address this need by increasing the thickness of the connection portion that attaches the brake band to the bell-shaped component, and by creating a geometrical disconnect between the connection portion and the brake surface, such as a channel or recess.

[0026] However, the increase in thermal mass and geometric complexity did not yield satisfactory results.

[0027] Therefore, the fundamental problem of the present invention is to provide a brake band and disc for a disc brake, the brake band and disc having structural and functional features that satisfy the above requirements, while overcoming the disadvantages described with reference to the prior art. Summary of the Invention

[0028] The object of the present invention is to provide a braking device that reduces the tendency to generate considerable thermal gradients and local stress peaks.

[0029] This purpose and other purposes and advantages are achieved by the brake bands, discs of disc brakes, and vehicles described and claimed herein.

[0030] Advantageous implementation methods are also described.

[0031] This disclosure is beneficial for heat transfer and thermal expansion in attaching a brake band to the inner diameter portion and attachment portion of a bell-shaped member.

[0032] Furthermore, this disclosure prevents excessive heat transfer to the internal portion of the brake band, thereby avoiding high thermal traction stress and resulting cracks in the attachment portion and plate.

[0033] Downhill simulation tests showed significant improvements in local thermal gradients and stress on the surface of the attachment portion used to attach the brake band to the bell-shaped element, while also reducing cracks on the brake surface.

[0034] The solution of this invention showed no cracks after 250 resistance cycle tests and improved heat distribution, unlike prior art solutions that cracked after less than 75 cycles.

[0035] The solutions of this invention allow for a reduction in the thermal gradient within the brake band and management of its thermal conductivity. These design modifications produce a uniform thermal expansion profile, resulting in reduced traction stress on the mounting and braking surfaces. These modifications eliminate surface damage at the attachment points and increase the number of cycles required for cracks to appear on the braking surface.

[0036] The solution of this invention also provides superior braking comfort compared to solutions of the prior art, and thus reduces vibration caused by thermal deformation.

[0037] Furthermore, the solution of the present invention maintains high and improved disc cooling efficiency. For example, the efficiency is significantly improved due to the increased airflow turbulence through the gaps in the brake band, which is determined by the specific shape of the heat dissipation and connecting elements between the plates.

[0038] Furthermore, the proposed solution ensures enhanced resistance to thermal damage.

[0039] Further features and advantages of the present invention, such as the brake band, the disc of the disc brake, and the vehicle, will become apparent from the following description of preferred embodiments given by way of non-limiting example with reference to the accompanying drawings. Attached Figure Description

[0040] Figure 1 A front view of the brake band from the inside or vehicle side according to the invention is shown; Figure 2 It shows Figure 1 A front view of the brake band on the outside or wheel side, wherein the angled region is shown as a cross-sectional view to show the gap and the heat dissipation and connection elements that form a cross-section at the mid-plane of the flow of cooling fluid through the gap. Figure 3 It shows Figure 1 Side view of the brake band; Figure 4 It shows Figure 1 The front view of the brake band from the outside or wheel side shows details, and in particular, the front view of the attachment portion for connecting the brake band to the vehicle wheel hub, such as to a wheel hub with a support, or a bell-shaped member, from the outside or wheel side. Figure 5 yes Figure 1Further details of the brake band are shown in the front view of the outer side or wheel side, particularly the front view of the outer side or wheel side of the attachment portion for connecting the brake band to the vehicle hub or bell-shaped component, and the cross-sectional portion of the angled region has been shown as a cross-sectional view to show the gap and the heat dissipation and connection elements that form the cross-section at the intermediate plane of the flow of cooling fluid through the gap. Figure 6 It shows Figure 1 A cross-sectional view of the brake band; Figure 7 yes Figure 6 An enlarged view of the cross-section, in which the connection between the plate and the attached part is clearly visible; Figure 8 shows details of the brake band in this technical field, where the temperature values ​​of the band under simulated downhill braking tests are shown in gray shades, and where the arrows indicate mechanical stress caused by thermal gradients, which leads to damage to the attachment parts. Figure 9 shows a detail of the brake band, introducing separation channels between the attachment portions. This figure illustrates how this solution allows for a reduction in the thermal gradient, but not in the localized stress generated by the thermal gradient. This results in cracks appearing near the base of the channels close to the plate, preventing the use of channels to homogenize cooling of the attachment portions; and Figure 10 An axonometric view is shown of a separate component having a brake disc that cooperates with the wheel hub and two brake pads of a vehicle, wherein the brake band is manufactured according to the invention. Detailed Implementation

[0041] According to a general embodiment, a brake band 1 for a ventilated disc of a disc brake 2 is provided.

[0042] Brake band 1 extends around the axis of rotation AA of brake band 1. The axis of rotation defines the axial direction XX.

[0043] Braking band 1 defines: a radial direction RR that is approximately orthogonal to the axial direction XX; a circumferential direction CC that is orthogonal to both the axial direction XX and the radial direction RR; and a tangential direction TT that is precisely orthogonal to both the axial direction XX and the radial direction RR.

[0044] The brake band 1 includes two plates 3 and 4: a first plate 3 and a second plate 4 arranged facing each other.

[0045] The first plate 3 and the second plate 4 respectively include the inner surface 5 of the first plate and the inner surface 6 of the second plate that directly or indirectly face and define the gap 7.

[0046] The first plate 3 and the second plate 4 are joined to each other by heat dissipation and connection elements 16, 17, and 19, also known as connecting elements.

[0047] Connecting elements 16, 17, and 19 protrude from plate 3 or plate 4 to reach the opposite plate 4 or plate 3, thereby forming a bridging element that connects plate 3 and plate 4 to each other.

[0048] The first plate 3 and the second plate 4 include a first plate outer surface 8 and a second plate outer surface 9, wherein opposite portions of the first plate outer surface 8 and the second plate outer surface 9 form opposite braking surfaces 10 and 11: the first plate braking surface 10 and the second plate braking surface 11, which are adapted to cooperate with the brake pad 25 to apply braking to the vehicle.

[0049] The first brake surface 10 and the second brake surface 11 extend between the inner diameter portion D1 near the rotation axis XX of the brake band 1 and the outer diameter portion D2 away from the rotation axis XX.

[0050] The brake band 1 also includes a plurality of attachment portions 26 for connecting the brake band 1 to the vehicle wheel hub 50 directly or indirectly, for example, but not necessarily via a bell-shaped member 33.

[0051] Each of the plurality of attachment portions 26 extends radially toward the rotation axis AA of the brake band.

[0052] Each attachment portion 26 includes at least one connector 27 for directly connecting the brake band 1 to the bell-shaped member 33; the connector has a predetermined arrangement in the radial direction RR and a predetermined radial connector height 28.

[0053] Multiple attachment portions 26 are spaced apart by recesses 29, which form free openings in the axial direction XX and the radial direction RR.

[0054] Each attachment portion 26 includes an attachment portion wall 36 extending in the axial direction XX and the radial direction RR. The attachment portion wall 36 includes: opposite side wall portions 37, each side wall portion 37 facing the adjacent attachment portion 26; two bottom wall portions 38 shared by the adjacent attachment portions 26, each bottom wall portion facing the rotation axis AA and connecting the two adjacent attachment portions 26; and an inner end wall portion 39, which is disposed at the inner radial end of each attachment portion 26 and connects to the opposite side wall portions 37.

[0055] Each attachment portion 26 includes a first attachment portion surface 42 and a second attachment portion surface 43 extending in opposite directions in the circumferential direction CC and the radial direction RR. One of the attachment portion surfaces 42 faces the outside of the brake band 1, and this surface is defined as the first attachment portion surface 42.

[0056] Advantageously, each recess 29 extends in the radial direction RR beyond the connecting seat 27, thereby approaching the inner diameter portion D1 of the first plate brake surface 10 and the second plate brake surface 11.

[0057] Each sidewall portion 37 is joined to the adjacent bottom wall portion 38 by a cylindrical bottom arch 40 that avoids sharp edges. According to an embodiment, the radius of the cylindrical bottom arch 40 is configured to maximize the uniformity of heat distribution on the attachment portions 26—for example, on the mounting flange—with respect to the number of attachment points, i.e., the number of attachment portions 26. The attachment flange must have sufficient thickness to withstand the applied torsional loads. The depth of the recess 29 can extend close to the braking surface, just enough to avoid interference with proper engagement of the pad 25 on the first plate braking surface 10. According to an embodiment, the thickness of the mounting flange is designed to maximize the uniformity of heat distribution on the mounting flange while retaining the ability to withstand the applied torsional loads. The attachment flange must have sufficient cross-sectional thickness to withstand the applied torsional loads.

[0058] Each sidewall portion 37 is joined to the adjacent inner endwall portion 39 by a cylindrical end arch 41 that avoids the ridges.

[0059] Unless the first plate braking surface 10 is worn, each first attachment portion surface 42 is substantially coplanar with the first plate braking surface 10.

[0060] The term "approximately coplanar" means that the brake band is new, i.e., without wear, or with minimal wear, similar to the wear produced during vehicle trial operation. Each first attachment surface 42 and the first brake plate surface 10 are coplanar with a difference between +1 mm and -1 mm in the axial direction XX. In other words, a maximum height difference of ±1 mm may exist between each first attachment surface 42 and the first brake plate surface 10 in the axial direction. However, another type of gap, channel, or fitting may be formed between each first attachment surface 42 and the first brake plate surface 10.

[0061] According to an alternative embodiment, each of the first brake surface 10 and the second brake surface 11 is arranged on a brake surface plane. Each brake surface plane is arranged to include a radial direction RR and a circumferential direction CC.

[0062] According to an alternative embodiment, the first plate braking surface 10 is an outer braking surface 10, or a braking surface facing the vehicle wheel.

[0063] According to an alternative embodiment, the second brake surface 11 is an inner brake surface 11 or a brake surface facing the vehicle.

[0064] According to an alternative embodiment, each first attachment portion surface 42 is coplanar with the new or average-wear first plate braking surface 10.

[0065] According to an alternative embodiment, the second attachment portion surface 43 is coplanar with the first inner surface 5 of the first plate 3 that defines the gap portion 7.

[0066] According to an alternative embodiment, the first attachment portion surface 42 is engaged with the first plate braking surface 10, thereby avoiding channels or grooves.

[0067] According to an alternative embodiment, the second attachment portion surface 43 is engaged with the first inner surface 5 of the first plate 3, thereby avoiding channels or grooves.

[0068] According to an alternative embodiment, a plurality of attachment portions 26 for attaching the brake band 1 to the vehicle wheel hub 50 or the bell-shaped member 33 are evenly distributed along the circumferential direction CC.

[0069] According to an alternative embodiment, the sidewall portions 37 of adjacent attachment portions 26 face each other and are parallel.

[0070] According to an alternative embodiment, the plurality of attachment portions 26 of the brake band 1 form a blade-like geometry without ridges.

[0071] According to an alternative embodiment, all attachment portion walls 36 of the plurality of attachment portions 26 include cylindrical bottom arches 40 of equal size.

[0072] According to an alternative embodiment, all attachment portion walls 36 of the plurality of attachment portions 26 include cylindrical end arches 41 of equal size.

[0073] According to an alternative embodiment, the cylindrical end arch 41 has a larger dimension than the cylindrical bottom arch 40.

[0074] According to an alternative embodiment, the size of the cylindrical end arch 41 is 14 mm, and the size of the cylindrical bottom arch 40 is 12 mm.

[0075] According to an alternative embodiment, each of the plurality of attachment portions 26 of the brake band 1 includes a predetermined attachment portion axial thickness 44 evaluated in the axial direction XX. The attachment portion axial thickness 44 is approximately equal to the axial thickness 14 of the first plate.

[0076] According to an alternative embodiment, each of the plurality of attachment portions 26 of the brake band 1 includes a predetermined attachment portion axial thickness 44 evaluated in the axial direction XX, the attachment portion axial thickness 44 being 18 mm.

[0077] According to the alternative implementation, protrusions that are different from the plurality of attachment portions 26 are avoided, for example, the sound wheel connection protrusion is avoided in the brake band 1.

[0078] According to an alternative embodiment, the connector 27 of each attachment portion 26 is an aperture with a closed perimeter, wherein the closed path is understood as a path extending in a plane including the radial direction RR and the circumferential direction CC. The connector 27 may be a hole that is open in the axial direction XX. The inner end wall portion 39 and the closed perimeter of the connector 27 are... Figure 4 The distance marked "L" is greater than the distance between the bottom wall portion 38 and the first plate braking surface 10. Figure 4 The distance in the middle is the distance to "I".

[0079] According to an alternative embodiment, under non-wear conditions, the first plate 3 has a predetermined first plate axial thickness 20, thereby defining the thickness of the first plate 3 in the axial direction XX.

[0080] According to an alternative embodiment, under non-wear conditions, the second plate 4 has a predetermined second plate axial thickness 21, thereby defining the thickness of the second plate 4 in the axial direction XX.

[0081] According to an alternative implementation, the axial thickness 20 of the first plate is greater than the axial thickness 21 of the second plate.

[0082] According to an alternative embodiment, the first attachment portion surface 42 is joined to the inner end wall portion 39 by an attachment portion inclined portion 49, which is, for example, a wall inclined at 49 degrees relative to the axial direction XX.

[0083] According to an alternative embodiment, the first attachment portion surface 42 is joined to the inner end wall portion 39 by an attachment portion inclined portion 49 extending orthogonally in the radial direction RR.

[0084] According to an alternative embodiment, the intermediate plane of the flow of cooling fluid P through the gap 7 is shifted relative to the centerline M of the brake band.

[0085] According to an alternative embodiment, the intermediate plane of the flow of cooling fluid through the gap 7 is shifted by 0.75 mm relative to the center line M of the brake band.

[0086] According to an alternative embodiment, the intermediate plane of the flow of cooling fluid P through the gap 7 is shifted toward the second plate 4 in the axial direction XX relative to the center line M of the brake band 1.

[0087] According to an alternative embodiment, each heat dissipation and connection element 16, 17, 19 has two corresponding first connection element ends 45 and second connection element ends 46, which are engaged to the plate at the first connection element ends 45 and the second connection element ends 46. Some of the heat dissipation and connection elements 17 are associated with an elongated ridge 47, 48 extending from at least one of the first connection element ends 45 and the second connection element ends 46 in at least one given direction.

[0088] The elongated ridges 47 and 48 are integrally formed with the heat dissipation and connection element 17 and at least one plate 3 or 4.

[0089] The elongated ridges 47 and 48 protrude from at least one of the inner surfaces of the first inner surface 5 of the first plate 3 and the second inner surface 6 of the second plate 4, and protrude from at least one of the first inner surface 5 or the second inner surface 6 at a height that is lower than the axial distance between the first inner surface 5 and the second inner surface 6, or that is lower than the height of the gap 7.

[0090] According to an alternative embodiment, the elongated ridge 47 is an elongated ridge that extends in either the circumferential or tangential direction.

[0091] According to an alternative embodiment, three elongated ridges 47, 48 are associated with each of the heat dissipation and connection elements 17, wherein two of the elongated ridges 47 extend in two opposite directions along the circumferential direction CC, and the third elongated ridge 48 extends in the radial direction RR.

[0092] According to an alternative embodiment, three elongated ridges 47, 48 are associated with each of the heat dissipation and connection elements 17, wherein two of the elongated ridges 47 extend in two opposite directions along the circumferential direction CC, and the third elongated ridge 48 extends radially outward until it approaches the outer peripheral edge of the plates 3, 4.

[0093] According to an alternative embodiment, each elongated ridge 47, 48 has a convex profile according to the axial cross-sectional plane.

[0094] The present invention also relates to a disc 2 of a disc brake, comprising: a brake band 1 defined by any of the above embodiments, and a wheel hub 50 or bell-shaped member 33 of a vehicle, the wheel hub 50 or bell-shaped member 33 being associated with the brake band 1 and adapted to be connected to the wheel hub of the vehicle.

[0095] The present invention also relates to a vehicle comprising a disc 2 for a disc brake as described in any of the embodiments described herein.

[0096] List of reference numerals 1 Brake band 2 disc brakes 3 panels, or the first panel, or the outer panel 4th board, or second board, or outer board 5. The inner surface of the first plate or the outer plate 6. Second plate, or inner surface of inner plate 7. Gap 8. Surface of outer panel, or surface of first outer panel, or outer surface of outer panel 9. Surface of the outer panel, or the surface of the second outer panel, or the outer surface of the inner panel 10. First plate, or outer plate, first braking surface 11. Second plate, or inner plate, second braking surface 12 panels, or outer panels 13 plates, or inner plates 14. Plate thickness, or first plate thickness, or outer plate thickness 15mm thick plate, or second plate thickness, or inner plate thickness 16 Components for heat dissipation and T-shaped column connection 17 Components for heat dissipation and comet-shaped column connection 18 First Column 19 Components for heat dissipation and rhomboid column connection 20. Axial thickness of the first plate, or axial thickness of the outer plate 21. Axial thickness of the second plate, or axial thickness of the inner plate 23 Second Column 24 Third Column 25 brake pads 26. The attachment portion of the brake band to the vehicle's wheel hub 50 or bell-shaped component. 27. Attachment for connecting to the wheel hub 50 or bell-shaped part of the vehicle. 28 radial connector height 29 Recesses provided between adjacent attachment portions 33 bell-shaped pieces 35 outer edge 36 Attachment Part Wall 37 Sidewall Section 38 Bottom wall section 39 Inner end wall portion 40. Cylindrical bottom arched part 41. Cylindrical end arched section 42 The surface of the first attachment portion, or the surface of the outer attachment portion 43 The surface of the second attachment portion, or the surface of the inner attachment portion 44 Axial thickness of the attachment portion 45 First connecting element end 46 Second connecting element end 47. Elongated connecting element ridges in the circumferential or tangential direction 48 radially elongated ridges 49. Attached portion inclined section 50 vehicle rims 51 Threaded Part 52 Fixing Nut AA brake band or brake disc rotation axis XX is the axis of rotation or axial direction. RR Radial direction CC circumferential direction TT tangential direction D1 Inner Brake Surface Diameter D2 External Brake Surface Diameter H-band height The middle plane of the flow of P cooling fluid M brake band centerline or axial cross-sectional plane The distance between the inner end wall portion 39 of L and the closed periphery of the connecting seat The distance between the bottom wall portion of I and the braking surface of the first plate.

Claims

1. A brake band for a ventilated disc of a disc brake, wherein, The brake band extends about the axis of rotation (AA) of the brake band, which defines an axial direction (XX). The brake band defines: a radial direction (RR) orthogonal to the axial direction (XX), a circumferential direction (CC) orthogonal to both the axial direction (XX) and the radial direction (RR), and a tangential direction (TT) precisely orthogonal to the axial direction (XX) and the radial direction (RR). The brake band includes a first plate and a second plate arranged facing each other. The first plate and the second plate each include an inner surface of the first plate and an inner surface of the second plate, and the inner surfaces of the first plate and the second plate are arranged to directly or indirectly face and define the gap. The first plate and the second plate are joined to each other by heat dissipation and connection components; The heat dissipation and connection element protrudes from one of the first plate and the second plate to reach the opposite plate of the first plate and the second plate, thereby forming a bridging element that connects the first plate and the second plate to each other; The first plate and the second plate respectively include a first plate outer surface and a second plate outer surface, wherein opposite portions of the first plate outer surface and the second plate outer surface form a first plate braking surface and a second plate braking surface opposite to the first plate braking surface, the first plate braking surface and the second plate braking surface being adapted to cooperate with the brake pad to apply braking to the vehicle; The first plate braking surface and the second plate braking surface extend between an inner diameter portion (D1) near the rotation axis (AA) of the brake band and an outer diameter portion (D2) away from the rotation axis (AA) of the brake band, wherein, The brake band also includes multiple attachment portions that directly or indirectly connect the brake band to the vehicle wheel hub or bell-shaped component. Each of the plurality of attachment portions extends radially toward the axis of rotation (AA) of the brake band; Each attachment portion includes at least one connector for directly connecting the brake band to the vehicle wheel hub; the at least one connector is arranged at a predetermined position in the radial direction (RR) and has a predetermined radial connector height; The plurality of attachment portions are spaced apart by recesses, which form free openings toward the axis of rotation (AA) of the brake band in the axial direction (XX) and radial direction (RR); And wherein each attachment portion includes an attachment portion wall extending along the axial direction (XX) and the radial direction (RR); The attachment portion wall includes: opposite sidewall portions, each sidewall portion facing an adjacent attachment portion; two bottom wall portions shared by adjacent attachment portions, each bottom wall portion facing the axis of rotation (AA) and connecting the two adjacent attachment portions; and an inner end wall portion, the inner end wall portion being disposed at the inner end of each attachment portion in the radial direction and connecting the opposite sidewall portions. Each attachment portion includes opposing first attachment portion surfaces and second attachment portion surfaces extending in a circumferential direction (CC) and a radial direction (RR); one of the first attachment portion surfaces and the second attachment portion surface is oriented outside the brake band, and said one attachment portion surface is defined as the first attachment portion surface; wherein, Each recess extends in the radial direction (RR) beyond the at least one connecting seat, thereby approaching the inner diameter portion (D1) of the first plate brake surface and the second plate brake surface. And among them, Each sidewall section joins the adjacent bottom wall section through a cylindrical bottom arch that avoids sharp edges; Each sidewall portion joins the adjacent inner endwall portion by a cylindrical end arch that avoids ridges; and, unless the first plate braking surface is worn, the surface of each first attachment portion is coplanar with the first plate braking surface.

2. The brake band according to claim 1, wherein, The first brake plate surface is an outer brake surface or a brake surface facing the vehicle wheel; And wherein each first attachment portion surface is coplanar with the first plate braking surface in a non-wearing state or in a wearing state after trial operation; or wherein each first attachment portion surface is coplanar with the first plate braking surface with a difference between +1 mm and -1 mm.

3. The brake band according to claim 1, wherein, The surface of the second attachment portion is coplanar with the inner surface of the first plate that defines the gap. Alternatively, the surface of the first attachment portion may be engaged with the braking surface of the first plate, thereby avoiding channels or grooves; and Alternatively, the surface of the second attachment portion may be bonded to the inner surface of the first plate, thereby avoiding channels or grooves.

4. The brake band according to claim 1, wherein, The plurality of attachment portions are evenly distributed along the circumferential direction (CC).

5. The brake band according to claim 1, wherein, The opposing sidewall portions of adjacent attachment portions face each other and are parallel.

6. The brake band according to claim 1, wherein, The plurality of attachment portions form a leaf-like geometry without edges.

7. The brake band according to claim 1, wherein, All the attachment portions of the plurality of attachment portions have walls of cylindrical bottom arches of equal size; Or one of them, All the attachment portions of the plurality of attachment portions include cylindrical end arches of equal size; Or one of them, The cylindrical end arched portion has a larger dimension than the cylindrical bottom arched portion; Or one of them, All the attachment portions of the plurality of attachment portions include a cylindrical bottom arch, and the dimension of the cylindrical bottom arch is 12 mm. All the attachment portions of the plurality of attachment portions include a cylindrical end arch, wherein the dimension of the cylindrical end arch is 14 mm.

8. The brake band according to claim 1, wherein, Each of the plurality of attachment portions includes a predetermined axial thickness of the attachment portion evaluated in the axial direction (XX), and The predetermined axial thickness of the attachment portion is equal to the axial thickness of the first plate. Or one of them, Each of the plurality of attachment portions includes a predetermined axial thickness of the attachment portion evaluated in the axial direction (XX), and wherein the predetermined axial thickness of the attachment portion is 18 mm.

9. The brake band according to claim 1, wherein, In the brake band, protrusions that differ from the plurality of attachment portions, including the tone wheel connection protrusion, are avoided.

10. The brake band according to claim 1, wherein, The at least one connector of each attachment portion is an eyelet with a closed perimeter along a path in a plane including the radial direction (RR) and the circumferential direction (CC), and the eyelet is an open hole in the axial direction (XX).

11. The brake band according to claim 1, wherein, The at least one connector of each attachment portion is an eyelet with a closed perimeter, the closed perimeter being a path along a plane including the radial direction (RR) and the circumferential direction (CC), the eyelet being an open hole in the axial direction (XX). The distance between the inner end wall portion and the closed periphery of the at least one connecting seat is greater than the distance between the bottom wall portion and the braking surface of the first plate.

12. The brake band according to claim 1, wherein, In the non-wear condition, the first plate includes a predetermined first plate axial thickness, the first plate axial thickness defining the thickness in the axial direction (XX) of the first plate; and In the non-wear condition, the second plate includes a predetermined second plate axial thickness, which defines the thickness of the second plate in the axial direction (XX); and The axial thickness of the first plate is greater than the axial thickness of the second plate.

13. The brake band according to claim 1, wherein, The surface of the first attachment portion is joined to the inner end wall portion through the inclined portion of the attachment portion, and the inclined portion of the attachment portion is inclined at 45 degrees relative to the axial direction (XX); Or one of them, The surface of the first attachment portion is joined to the inner end wall portion by an inclined portion of the attachment portion, wherein the inclined portion of the attachment portion extends orthogonally to the radial direction (RR).

14. The brake band according to claim 1, wherein, The intermediate plane (P) of the flow of cooling fluid through the gap is shifted relative to the centerline (M) of the brake band; The intermediate plane (P) of the cooling fluid flow through the gap is shifted by 0.75 mm relative to the centerline (M) of the brake band; or wherein, The intermediate plane (P) of the flow of the cooling fluid through the gap is displaced relative to the center line (M) of the brake band along the axial direction (XX) toward the second plate.

15. The brake band according to claim 1, wherein, Each heat dissipation and connection element has two corresponding ends, which are joined to the first plate and the second plate at the two corresponding ends; Some of the heat dissipation and connection elements are associated with an elongated ridge extending from at least one of the two corresponding ends in at least one given direction. The elongated ridge is integrally formed with some of the heat dissipation and connection elements and at least one of the first plate and the second plate; as well as The elongated ridge protrudes from at least one inner surface of the first inner surface of the first plate and the second inner surface of the second plate, and protrudes from at least one of the inner surfaces of the first plate and the second plate to a height that is lower than the axial distance between the inner surfaces of the first plate and the second plate, or the height that is lower than the height of the gap.

16. The brake band according to claim 15, wherein, The elongated ridge includes an elongated connecting element extending in the circumferential or tangential direction; Or one of them, The three elongated ridges are associated with each of the aforementioned heat dissipation and connection elements, two of which extend in opposite directions in the circumferential direction (CC), and the third elongated ridge extends in the radial direction (RR). Or one of them, Three elongated ridges are associated with each of the heat dissipation and connection elements, two of which extend in opposite directions in the circumferential direction (CC), and a third elongated ridge extends radially outward until it approaches the outer peripheral edges of the first and second plates.

17. The brake band according to claim 15, wherein, Each elongated ridge has a convex profile based on the axial cross-sectional plane.

18. A disc of a disc brake, said disc comprising a brake band, wherein, The brake band extends about the axis of rotation (AA) of the brake band, which defines an axial direction (XX). The brake band defines: a radial direction (RR) orthogonal to the axial direction (XX), a circumferential direction (CC) orthogonal to both the axial direction (XX) and the radial direction (RR), and a tangential direction (TT) precisely orthogonal to the axial direction (XX) and the radial direction (RR). The brake band includes a first plate and a second plate arranged facing each other. The first plate and the second plate each include an inner surface of the first plate and an inner surface of the second plate, and the inner surfaces of the first plate and the second plate are arranged to directly or indirectly face and define the gap. The first plate and the second plate are joined to each other by heat dissipation and connection components; The heat dissipation and connection element protrudes from one of the first plate and the second plate to reach the opposite plate of the first plate and the second plate, thereby forming a bridging element that connects the first plate and the second plate to each other; The first plate and the second plate respectively include a first plate outer surface and a second plate outer surface, wherein opposite portions of the first plate outer surface and the second plate outer surface form a first plate braking surface and a second plate braking surface opposite to the first plate braking surface, the first plate braking surface and the second plate braking surface being adapted to cooperate with the brake pad to apply braking to the vehicle; The first plate braking surface and the second plate braking surface extend between an inner diameter portion (D1) near the rotation axis (AA) of the brake band and an outer diameter portion (D2) away from the rotation axis (AA) of the brake band, wherein, The brake band also includes multiple attachment portions that directly or indirectly connect the brake band to the vehicle wheel hub or bell-shaped component. Each of the plurality of attachment portions extends radially toward the axis of rotation (AA) of the brake band; Each attachment portion includes at least one connector for directly connecting the brake band to the vehicle wheel hub; the at least one connector is arranged at a predetermined position in the radial direction (RR) and has a predetermined radial connector height; The plurality of attachment portions are spaced apart by recesses, which form free openings toward the axis of rotation (AA) of the brake band in the axial direction (XX) and radial direction (RR); And wherein each attachment portion includes an attachment portion wall extending along the axial direction (XX) and the radial direction (RR); The attachment portion wall includes: opposite sidewall portions, each sidewall portion facing an adjacent attachment portion; two bottom wall portions shared by adjacent attachment portions, each bottom wall portion facing the axis of rotation (AA) and connecting the two adjacent attachment portions; and an inner end wall portion, the inner end wall portion being disposed at the inner end of each attachment portion in the radial direction and connecting the opposite sidewall portions. Each attachment portion includes a first attachment portion surface and a second attachment portion surface extending in opposite directions in the circumferential direction (CC) and the radial direction (RR); one of the first attachment portion surfaces and the second attachment portion surface faces the outside of the brake band, and the one attachment portion surface is defined as the first attachment portion surface; Each recess extends in the radial direction (RR) beyond the at least one connecting seat, thereby approaching the inner diameter portion (D1) of the first plate brake surface and the second plate brake surface. And among them, Each sidewall section joins the adjacent bottom wall section through a cylindrical bottom arch that avoids sharp edges; Each sidewall portion joins the adjacent inner endwall portion through a cylindrical end arch that avoids ridges; and, unless the first plate braking surface is worn, the surface of each first attachment portion is coplanar with the first plate braking surface, and A vehicle hub or bell-shaped component, which is associated with the brake band and adapted to be connected to the hub of a vehicle wheel.

19. A vehicle comprising a disc for a disc brake, the disc brake comprising a brake band, wherein, The brake band extends about the axis of rotation (AA) of the brake band, which defines an axial direction (XX). The brake band defines: a radial direction (RR) orthogonal to the axial direction (XX), a circumferential direction (CC) orthogonal to both the axial direction (XX) and the radial direction (RR), and a tangential direction (TT) precisely orthogonal to the axial direction (XX) and the radial direction (RR). The brake band includes a first plate and a second plate arranged facing each other. The first plate and the second plate each include an inner surface of the first plate and an inner surface of the second plate, and the inner surfaces of the first plate and the second plate are arranged to face each other directly or indirectly and define a gap. The first plate and the second plate are joined to each other by heat dissipation and connection components; The heat dissipation and connection element protrudes from one of the first plate and the second plate to reach the opposite plate of the first plate and the second plate, thereby forming a bridging element that connects the first plate and the second plate to each other; The first plate and the second plate respectively include a first plate outer surface and a second plate outer surface, wherein opposite portions of the first plate outer surface and the second plate outer surface form a first plate braking surface and a second plate braking surface opposite to the first plate braking surface, the first plate braking surface and the second plate braking surface being adapted to cooperate with the brake pad to apply braking to the vehicle; The first plate braking surface and the second plate braking surface extend between an inner diameter portion (D1) near the rotation axis (AA) of the brake band and an outer diameter portion (D2) away from the rotation axis (AA) of the brake band, wherein, The brake band also includes multiple attachment portions that directly or indirectly connect the brake band to the vehicle wheel hub or bell-shaped component. Each of the plurality of attachment portions extends radially toward the axis of rotation (AA) of the brake band; Each attachment portion includes at least one connector for directly connecting the brake band to the vehicle wheel hub; the at least one connector is arranged at a predetermined position in the radial direction (RR) and has a predetermined radial connector height; The plurality of attachment portions are spaced apart by recesses, which form free openings toward the axis of rotation (AA) of the brake band in the axial direction (XX) and radial direction (RR); And wherein each attachment portion includes an attachment portion wall extending along the axial direction (XX) and the radial direction (RR); The attachment portion wall includes: opposite sidewall portions, each sidewall portion facing an adjacent attachment portion; two bottom wall portions shared by adjacent attachment portions, each bottom wall portion facing the axis of rotation (AA) and connecting the two adjacent attachment portions; and an inner end wall portion, the inner end wall portion being disposed at the inner end of each attachment portion in the radial direction and connecting the opposite sidewall portions. Each attachment portion includes a first attachment portion surface and a second attachment portion surface extending in opposite directions in the circumferential direction (CC) and the radial direction (RR); one of the first attachment portion surfaces and the second attachment portion surface faces the outside of the brake band, and the one attachment portion surface is defined as the first attachment portion surface; Each recess extends in the radial direction (RR) beyond the at least one connecting seat, thereby approaching the inner diameter portion (D1) of the first plate brake surface and the second plate brake surface. And among them, Each sidewall section joins the adjacent bottom wall section through a cylindrical bottom arch that avoids sharp edges; Each sidewall portion joins the adjacent inner endwall portion through a cylindrical end arch that avoids ridges; and, unless the first plate braking surface is worn, the surface of each first attachment portion is coplanar with the first plate braking surface, and A vehicle hub or bell-shaped component, which is associated with the brake band and adapted to be connected to the hub of a vehicle wheel.

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