Braking band of a disk for a disk brake of the ventilated type

Abstract

A braking band of a disk brake disk has a first plate and a second plate arranged joined to each other by connecting elements. The first and second plates have first and second plate outer surfaces, opposite portions of the first and second outer surfaces forming opposite braking surfaces. The braking band has a plurality of attachment portions for connecting the braking band to a vehicle hub or a bell. Each attachment portion has a connection seat. The attachment portions are spaced by recesses. Each attachment portion has an attachment portion wall having opposite side wall portions, two bottom wall portions and an inner end wall portion, and opposite first and second attachment portion surfaces. Each recess extends radially beyond the connection seat. Each side wall portion is joined to the adjoining bottom wall portion by a cylindrical bottom arch avoiding edges. Each side wall portion is joined to the adjoining inner end wall portion by a cylindrical end arch avoiding edges. Each first attachment portion surface is coplanar to the first braking surface except for the wear of the first braking surface.

Claims

1. A braking band of a disk brake disk of the ventilated type, wherein said braking band extends about a rotation axis (A-A) of the braking band, said rotation axis defining an axial direction (X-X); said braking band defines a radial direction (R-R), orthogonal to said axial direction (X-X), a circumferential direction (C-C), orthogonal both to said axial direction (X-X) and to said radial direction (R-R), and a tangential direction (T-T), punctually orthogonal to the axial direction (X-X) and the radial direction (R-R); said braking band comprises a first plate and a second plate mutually arranged facing each other; said first and second plates comprise, respectively, a first plate inner surface and a second plate inner surface arranged directly or indirectly facing and delimiting a gap; said first and second plates are joined to each other by heat dissipation and connecting elements; said heat dissipation and connecting elements project from one of said first and second plates to reach an opposite plate of said first and second plates, forming bridges, connecting the first and second plates to each other; said first and second plates comprise, respectively, a first plate outer surface and a second plate outer surface, and wherein opposite portions of said first and second outer surfaces form a first plate braking surface and a second plate braking surface, opposite said first braking plate surface, said first and second braking plate surfaces being adapted to cooperate with brake pads to apply a braking action on a vehicle; said first and second plate braking surfaces extend between an inner diameter (D1), near the rotation axis (A-A) of the braking band, and an outer diameter (D2), far from said rotation axis (A-A) of the braking band, wherein said braking band further comprises a plurality of attachment portions connecting said braking band directly or indirectly to a vehicle hub or a bell; each attachment portion of said plurality of attachment portions radially extends towards the rotation axis (A-A) of the braking band; each attachment portion comprises at least one connection seat directly connecting the braking band to said vehicle hub; said at least one connection seat being arranged at a predefined position in the radial direction (R-R) and having a predefined radial connection seat height; said plurality of attachment portions are spaced apart by recesses forming free openings in axial direction (X-X) and in radial direction (R-R) towards the rotation axis (A-A) of the braking band; and wherein each attachment portion comprises an attachment portion wall extending in the axial (X-X) and radial (R-R) directions; said attachment portion wall comprises opposite side wall portions, each side wall portion facing an adjoining attachment portion; two bottom wall portions in common with adjoining attachment portions, each bottom wall portion facing said rotation axis (A-A) and connecting two adjoining attachment portions; and an inner end wall portion placed at a radially inner end of each attachment portion and connecting the opposite side wall portions; each attachment portion comprises opposite first and second attachment portion surfaces extending in circumferential direction (C-C) and radial direction (R-R); one of said attachment portion surfaces is oriented externally the braking band, this surface is defined a first attachment portion surface; wherein each recess radially (R-R) extends beyond said at least one connection seat coming close to said inner diameter (D1) of said first and second plate braking surfaces; and wherein each side wall portion is joined to an adjoining bottom wall portion by a cylindrical bottom arch; each side wall portion is joined to an adjoining inner end wall portion by a cylindrical end arch; and each first attachment portion surface is coplanar to said first plate braking surface.

2. The braking band of claim 1, wherein said first plate braking surface is an outer braking surface or a braking surface facing a wheel of the vehicle; and wherein each first attachment portion surface is coplanar to said first plate braking surface in a non-worn or a worn state after running-in; or wherein each first attachment portion surface is substantially coplanar to said first plate braking surface.

3. The braking band of claim 1, wherein said second attachment portion surface is coplanar to said first plate inner surface delimiting said gap, wherein said first attachment portion surface is joined to said first braking plate surface without channels or grooves; wherein said second attachment portion surface is joined to said first plate inner surface without channels or grooves.

4. The braking band of claim 1, wherein said plurality of attachment portions are uniformly distributed along the circumferential direction (C-C).

5. The braking band of claim 1, wherein said opposite side wall portions of adjoining attachment portions are mutually facing and parallel.

6. The braking band of claim 1, wherein said plurality of attachment portions form a lobed geometry devoid of edges.

7. The braking band of claim 1, wherein all attachment portion walls of said plurality of attachment portions comprise cylindrical bottom arches of equal dimensions; or wherein all attachment portion walls of said plurality of attachment portions comprise cylindrical end arches of equal dimensions; or wherein said cylindrical end arches are of greater dimensions than said cylindrical bottom arches; or wherein all attachment portion walls of said plurality of attachment portions comprise cylindrical bottom arches and all attachment portion walls of said plurality of attachment portions comprise cylindrical end arches.

8. The braking band of claim 1, wherein each attachment portion of said plurality of attachment portions comprises a predefined attachment portion axial thickness, and said predefined attachment portion axial thickness is equal to an axial thickness of said first plate; or wherein each attachment portion of said plurality of attachment portions comprises a predefined attachment portion axial thickness, and wherein said predefined attachment portion axial thickness is 18 mm.

9. The braking band of claim 1, wherein said at least one connection seat of each attachment portion is an eyelet with a closed perimeter along a path on a plane containing said radial (R-R) and circumferential (C-C) directions, that is an open hole in an axial direction (X-X).

10. The braking band of claim 1, wherein a distance between said inner end wall portion and said closed perimeter of said at least one connection seat is greater than a distance between said bottom wall portion and said first plate braking surface.

11. The braking band of claim 1, wherein in a non-worn condition, said first plate comprises a predefined first plate axial thickness, which defines thickness in the axial direction (X-X) of said first plate; and in a non-worn condition, said second plate comprises a predefined second plate axial thickness, which defines thickness in the axial direction (X-X) of said second plate; and said first plate axial thickness is greater than said second plate axial thickness.

12. The braking band of claim 1, wherein said first attachment portion surface is joined to said inner end wall portion by an attachment portion bevel inclined by 45 degrees with respect to said axial direction (X-X); or wherein said first attachment portion surface is joined to said inner end wall portion by an attachment portion bevel, wherein said attachment portion bevel extends orthogonally to the radial direction (R-R).

13. The braking band of claim 1, wherein a median plane of flow of cooling fluid (P) crossing said gap is displaced with respect to a center line (M) of the braking band; the median plane of the flow of cooling fluid (P) crossing the gap is displaced with respect to the center line (M) of the braking band by 0.75 mm; or wherein the median plane of the flow of cooling fluid (P) crossing the gap is displaced along the axial direction (X-X) towards said second plate with respect to the center line (M) of the braking band.

14. The braking band of claim 1, wherein each heat dissipation and connecting element has two respective ends at which the heat dissipation and connecting element is joined to the first and second plates; some of said heat dissipation and connecting elements are associated with elongated ridges extending from at least one of said two respective ends in at least one given direction; the elongated ridges are integrally formed with said some heat dissipation and connecting elements and at least one plate of said first and second plates; and the elongated ridges are raised from at least one inner surface between said first and second inner surfaces of the first and second plates, and emerge from at least one of the first and second plate inner surfaces by a height inferior to an axial distance between the first and second plate inner surfaces or to gap height.

15. The braking band of claim 14, wherein said elongated ridges comprise elongated connection elements extending according to the circumferential or tangential directions; or wherein three elongated ridges are associated with each of said some heat dissipation and connecting elements, wherein two of the three elongated ridges extend according to two opposite directions in the circumferential direction (C-C), and a third elongated ridge of the three elongated ridges extends, in the radial direction (R-R); or wherein three elongated ridges are associated with each of said some heat dissipation and connecting elements, wherein two of the three elongated ridges extend according to two opposite directions in the circumferential direction (C-C), and a third elongated ridge of the three elongated ridges extends in the radial direction until it is close to an outer peripheral edge of the first and second plates.

16. The braking band of claim 14, wherein each elongated ridge has a convex.

17. A disk brake disk comprising a braking band wherein said braking band extends about a rotation axis (A-A) of the braking band, said rotation axis defining an axial direction (X-X); said braking band defines a radial direction (R-R), orthogonal to said axial direction (X-X), a circumferential direction (C-C), orthogonal both to said axial direction (X-X) and to said radial direction (R-R), and a tangential direction (T-T), punctually orthogonal to the axial direction (X-X) and the radial direction (R-R); said braking band comprises a first plate and a second plate mutually arranged facing each other; said first and second plates comprise, respectively, a first plate inner surface and a second plate inner surface arranged directly or indirectly facing and delimiting a gap; said first and second plates are joined to each other by heat dissipation and connecting elements; said heat dissipation and connecting elements project from one of said first and second plates to reach an opposite plate of said first and second plates, forming bridges, connecting the first and second plates to each other; said first and second plates comprise, respectively, a first plate outer surface and a second plate outer surface, and wherein opposite portions of said first and second outer surfaces form a first plate braking surface and a second plate braking surface, opposite said first braking plate surface, said first and second braking plate surfaces being adapted to cooperate with brake pads to apply a braking action on a vehicle; said first and second plate braking surfaces extend between an inner diameter (D1), near the rotation axis (A-A) of the braking band, and an outer diameter (D2), far from said rotation axis (A-A) of the braking band, wherein said braking band further comprises a plurality of attachment portions connecting said braking band directly or indirectly to a vehicle hub or a bell; each attachment portion of said plurality of attachment portions radially extends towards the rotation axis (A-A) of the braking band; each attachment portion comprises at least one connection seat directly connecting the braking band to said vehicle hub; said at least one connection seat being arranged at a predefined position in the radial direction (R-R) and having a predefined radial connection seat height; said plurality of attachment portions are spaced apart by recesses forming free openings in axial direction (X-X) and in radial direction (R-R) towards the rotation axis (A-A) of the braking band; and wherein each attachment portion comprises an attachment portion wall extending in the axial (X-X) and radial (R-R) directions; said attachment portion wall comprises opposite side wall portions, each side wall portion facing an adjoining attachment portion; two bottom wall portions in common with adjoining attachment portions, each bottom wall portion facing said rotation axis (A-A) and connecting two adjoining attachment portions; and an inner end wall portion placed at a radially inner end of each attachment portion and connecting the opposite side wall portions; each attachment portion comprises opposite first and second attachment portion surfaces extending in circumferential direction (C-C) and radial direction (R-R); one of said attachment portion surfaces faces externally said braking band, said surface is defined as a first attachment portion surface; wherein each recess radially (R-R) extends beyond said at least one connection seat coming close to said inner diameter (D1) of said first and second plate braking surfaces; and wherein each side wall portion is joined to an adjoining bottom wall portion by a cylindrical bottom arch; each side wall portion is joined to an adjoining inner end wall portion by a cylindrical end arch; each first attachment portion surface is coplanar to said first plate braking surface; and a vehicle hub or a bell associated with said braking band and adapted for connection to a hub of a vehicle wheel.

18. A vehicle comprising a disk for a disk brake, said disk brake disk comprising a braking band wherein said braking band extends about a rotation axis (A-A) of the braking band, said rotation axis defining an axial direction (X-X); said braking band defines a radial direction (R-R), orthogonal to said axial direction (X-X), a circumferential direction (C-C), orthogonal both to said axial direction (X-X) and to said radial direction (R-R), and a tangential direction (T-T), punctually orthogonal to the axial direction (X-X) and the radial direction (R-R); said braking band comprises a first plate and a second plate mutually arranged facing each other; said first and second plates comprise, respectively, a first plate inner surface and a second plate inner surface arranged directly or indirectly facing and delimiting a gap; said first and second plates are joined to each other by heat dissipation and connecting elements; said heat dissipation and connecting elements project from one of said first and second plates to reach an opposite plate of said first and second plates, forming bridges, connecting the first and second plates to each other; said first and second plates comprise, respectively, a first plate outer surface and a second plate outer surface, and wherein opposite portions of said first and second outer surfaces form a first plate braking surface and a second plate braking surface, opposite said first braking plate surface, said first and second braking plate surfaces being adapted to cooperate with brake pads to apply a braking action on a vehicle; said first and second plate braking surfaces extend between an inner diameter (D1), near the rotation axis (A-A) of the braking band, and an outer diameter (D2), far from said rotation axis (A-A) of the braking band, wherein said braking band further comprises a plurality of attachment portions connecting said braking band directly or indirectly to a vehicle hub or a bell; each attachment portion of said plurality of attachment portions radially extends towards the rotation axis (A-A) of the braking band; each attachment portion comprises at least one connection seat directly connecting the braking band to said vehicle hub; said at least one connection seat being arranged at a predefined position in the radial direction (R-R) and having a predefined radial connection seat height; said plurality of attachment portions are spaced apart by recesses forming free openings in axial direction (X-X) and in radial direction (R-R) towards the rotation axis (A-A) of the braking band; and wherein each attachment portion comprises an attachment portion wall extending in the axial (X-X) and radial (R-R) directions; said attachment portion wall comprises opposite side wall portions, each side wall portion facing an adjoining attachment portion; two bottom wall portions in common with adjoining attachment portions, each bottom wall portion facing said rotation axis (A-A) and connecting two adjoining attachment portions; and an inner end wall portion placed at a radially inner end of each attachment portion and connecting the opposite side wall portions; each attachment portion comprises opposite first and second attachment portion surfaces extending in circumferential direction (C-C) and radial direction (R-R); one of said attachment portion surfaces faces externally said braking band, said surface is defined as a first attachment portion surface; wherein each recess radially (R-R) extends beyond said at least one connection seat coming close to said inner diameter (D1) of said first and second plate braking surfaces; and wherein each side wall portion is joined to an adjoining bottom wall portion by a cylindrical bottom arch; each side wall portion is joined to an adjoining inner end wall portion by a cylindrical end arch; and each first attachment portion surface is coplanar to said first plate braking surface; and a vehicle hub or a bell associated with said braking band and adapted for connection to a hub of a vehicle wheel.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) FIG. 1 shows an inner side or vehicle side front view of a braking band according to the present invention;

(2) FIG. 2 shows an outer side or wheel side front view of the braking band of FIG. 1, in which an angular sector has been sectioned to show the gap and the dissipation and connecting elements sectioned at a median plane of the flow of cooling fluid crossing the gap;

(3) FIG. 3 shows a side view of the braking band of FIG. 1;

(4) FIG. 4 shows an outer side or wheel side front view of a detail of the braking band of FIG. 1 and, in particular, of the attachment portions for connection of the braking band to a a vehicle hub, for example, a hub with a bearing, or a bell;

(5) FIG. 5 is an outer side or wheel side front view of a further detail of the braking band of FIG. 1 and, in particular, of the attachment portions for connection of the braking band to a a vehicle hub or a bell and a sectioned portion of an angular sector has been sectioned to show the gap and the dissipation and connecting elements sectioned at a median plane of the flow of cooling fluid crossing the gap;

(6) FIG. 6 shows a cross-section of the braking band of FIG. 1;

(7) FIG. 7 is an enlargement of the section OF FIG. 6, in which the connection portions between the plates and the attachment portion are clearly visible;

(8) FIG. 8 is a detail of a braking band of the state of the art in which temperature values are shown in shades of gray when the band is subject to a braking test simulating a mountain descent and in which the arrows indicate mechanical stress caused by thermal gradients, which result in breakage of the attachment portion;

(9) FIG. 9 is a detail of a braking band, introducing separation channels between the attachment portions, showing how this solution allows reducing thermal gradients, but not the localized stress they create, resulting in cracks at the base of the channels close to the plates, discouraging use of channels to uniform the cooling of the attachment portions; and

(10) FIG. 10 shows an axonometric view with separated parts of a brake disk cooperating with a hub of a vehicle and with two brake pads, wherein the braking band is made according to the present invention.

DETAILED DESCRIPTION

(11) According to a general embodiment, a braking band 1 of a disk for a disk brake 2 of the ventilated type is provided.

(12) The braking band 1 extends about a rotation axis A-A of the braking band 1. The rotation axis defines an axial direction X-X.

(13) The braking band 1 defines a radial direction R-R, substantially orthogonal to the axial direction X-X, a circumferential direction C-C, orthogonal both to the axial direction X-X and to the radial direction R-R, and a tangential direction T-T, punctually orthogonal to the axial direction X-X and the radial direction R-R.

(14) The braking band 1 comprises two plates 3, 4, a first plate 3 and a second plate 4 arranged mutually facing each other.

(15) The first and second plates 3, 4 comprise, respectively, a first plate inner surface 5 and a second plate inner surface 6 arranged directly or indirectly facing and delimiting a gap 7.

(16) The first and second plates 3, 4 are joined to each other by heat dissipation and connecting elements 16, 17, 19, also referred to as connection elements.

(17) The connection elements 16, 17, 19 project from a plate 3 or 4 to reach the opposite plate 4 or 3, forming bridges, connecting the plates 3, 4 to each other.

(18) The first and second plates 3, 4 comprise first and second plate outer surfaces 8, 9, wherein opposite portions of the first and second plate outer surfaces 8, 9 form opposite braking surfaces 10, 11, a first plate braking surface 10 and a second plate braking surface 11, the first and second plate braking surfaces 10, 11 being adapted to cooperate with brake pads 25 to apply a braking action on a vehicle.

(19) The first and second plate braking surfaces 10, 11 extend between an inner diameter D1, near the rotation axis X-X of the braking band 1, and an outer diameter D2, far from the rotation axis X-X.

(20) The braking band 1 further comprises a plurality of attachment portions 26 for connecting the braking band 1, directly or indirectly, for example, but not necessarily through a bell 33, to a vehicle hub 50.

(21) Each attachment portion 26 of said plurality of attachment portions 26 extends radially towards the rotation axis A-A of the braking band.

(22) Each attachment portion 26 comprises at least one connection seat 27 for directly connecting the braking band 1 to the bell 33; the connection seat having a predefined arrangement in the radial direction R-R and a predefined radial connection seat height 28.

(23) The plurality of attachment portions 26 are spaced apart by recesses 29 forming free openings in axial direction X-X and in radial direction R-R.

(24) Each attachment portion 26 comprises an attachment portion wall 36 extending in axial X-X direction and radial R-R direction. The attachment portion wall 36 comprises opposite side wall portions 37, each side wall portion 37 facing an adjoining attachment portion 26, two bottom wall portions 38 in common with adjoining attachment portions 26, each bottom wall portion facing the rotation axis A-A and connecting two adjoining attachment portions 26, and an inner end wall portion 39 placed at a radially inner end of each attachment portion 26 and connecting the opposite side wall portions 37.

(25) Each attachment portion 26 comprises opposite first and second attachment portion surfaces 42, 43 extending in circumferential direction C-C and radial direction R-R. One of the attachment portion surfaces 42 externally faces the braking band 1, this surface, is defined first attachment portion surface 42.

(26) Advantageously, each recess 29 extends radially R-R beyond the connection seat 27 coming close to the inner diameter D1 of the first and second plate braking surfaces 10, 11.

(27) Each side wall portion 37 is joined to the adjoining bottom wall portion 38 by a cylindrical bottom arch 40 avoiding edges. According to an embodiment, the radius of the cylindrical bottom arch 40 is configured to maximize uniformity of thermal distribution on the attachment portions 26, for example, a mounting flange, with respect to the number of attachment points, i.e. attachment portions 26. The attachment flanges must have a sufficient thickness to withstand torsion loads of the application. The depth of the recesses 29 can extend close to the braking surface, i.e. just enough to avoid interfering with the correct interfacing of the pads 25 on the first plate braking surface 10. According to an embodiment, the thickness of the mounting flange is designed to maximize uniformity of thermal distribution on the mounting flange while preserving the capacity to withstand torsional loads of the application. The attachment flanges must have a sufficient section thickness to withstand torsion loads of the application.

(28) Each side wall portion 37 is joined to the adjoining inner end wall portion 39 by a cylindrical end arch 41 avoiding edges.

(29) Each first attachment portion surface 42 is substantially coplanar to said first plate braking surface 10 except for wear of the first plate braking surface 10.

(30) The term “substantially coplanar” means that the braking band is new, i.e. without wear, or with minimum wear, i.e. similar to wear resulting from the running-in of a vehicle. Each first attachment portion surface 42 is coplanar to the first plate braking surface 10 with a difference comprised between +1 mm and −1 mm in axial direction X-X. In other words, there may be a maximum difference in height of 1 mm both in positive and negative, in an axial direction between each first attachment portion surface 42 and the first plate braking surface 10. Nonetheless, between each first attachment portion surface 42 and the first plate braking surface 10 a gap, a channel or a fitting of another type may be formed.

(31) According to an alternative embodiment, each of the first and second plate braking surfaces 10, 11 is arranged on a braking surface plane. Each braking surface plane is arranged to comprise a radial direction R-R and a circumferential direction C-C.

(32) According to an alternative embodiment, the first plate braking surface 10 is an outer braking surface 10 or a braking surface facing the wheel of the vehicle.

(33) According to an alternative embodiment, the second plate braking surface 11 is an inner braking surface 11 or a braking surface facing the vehicle.

(34) According to an alternative embodiment, each first attachment portion surface 42 is coplanar to the first plate braking surface 10 new or in its average state of wear.

(35) According to an alternative embodiment, the second attachment portion surface 43 is coplanar to the first inner surface 5 of the first plate 3 delimiting the gap 7.

(36) According to an alternative embodiment, the first attachment portion surface 42 is joined to the first plate braking surface 10 avoiding channels or grooves.

(37) According to an alternative embodiment, the second attachment portion surface 43 is joined to the first inner surface 5 of the first plate 3 avoiding channels or grooves.

(38) According to an alternative embodiment, the plurality of attachment portions 26 for attaching the braking band 1 to vehicle hub 50 or a bell 33 are uniformly distributed along the circumferential direction C-C.

(39) According to an alternative embodiment, the side wall portions 37 of adjoining attachment portions 26 are mutually facing and parallel.

(40) According to an alternative embodiment, the plurality of attachment portions 26 of the braking band 1 forms a lobed geometry devoid of edges.

(41) According to an alternative embodiment, all attachment portion walls 36 of the plurality of attachment portions 26 comprise cylindrical bottom arches 40 of equal dimensions.

(42) According to an alternative embodiment, all attachment portion walls 36 of the plurality of attachment portions 26 comprise cylindrical end arches 41 of equal dimensions.

(43) According to an alternative embodiment, the cylindrical end arches 41 have greater dimensions than the cylindrical bottom arches 40.

(44) According to an alternative embodiment, dimension of the cylindrical end arches 41 is 14 mm and dimension of the cylindrical bottom arches 40 is 12 mm.

(45) According to an alternative embodiment, each attachment portion 26 of the plurality of attachment portions 26 of the braking band 1 comprises a predefined attachment portion axial thickness 44 evaluated in axial direction X-X. The attachment portion axial thickness 44 is substantially equal to the axial thickness 14 of the first plate.

(46) According to an alternative embodiment, each attachment portion 26 of said plurality of attachment portions 26 of the braking band 1 comprises a predefined attachment portion axial thickness 44 evaluated in axial direction X-X, the attachment portion axial thickness 44 being of 18 mm.

(47) According to an alternative embodiment, projections different from the plurality of attachment portions 26 are avoided, e.g. phonic wheel connection projections are avoided in the braking band 1.

(48) According to an alternative embodiment, the connection seat 27 of each attachment portion 26 is an eyelet with a closed perimeter, where a closed path is understood to mean a path extending on a plane containing the radial R-R direction and the circumferential C-C direction. The connection seat 27 may be a hole, which is open in axial direction X-X. The distance, “L” in FIG. 4, between the inner end wall portion 39 and the closed perimeter of the connection seat 27 is greater than the distance, “I” in FIG. 4, between the bottom wall portion 38 and the first plate braking surface 10.

(49) According to an alternative embodiment, in non-worn conditions, the first plate 3 has a predefined first plate axial thickness 20 defining the thickness in axial direction X-X of the first plate 3.

(50) According to an alternative embodiment, in non-worn conditions, the second plate 4 has a predefined second plate axial thickness 21 defining the thickness in an axial direction X-X of the second plate 4.

(51) According to an alternative embodiment, the first plate axial thickness 20 is greater than the second plate axial thickness 21.

(52) According to an alternative embodiment, the first attachment portion surface 42 is joined to the inner end wall portion 39 by an attachment portion bevel 49, e.g. a wall inclined by 49 degrees with respect to the axial direction X-X.

(53) According to an alternative embodiment, the first attachment portion surface 42 is joined to the inner end wall portion 39 by an attachment portion bevel 49 extending orthogonally to the radial direction R-R.

(54) According to an alternative embodiment, the median plane of the flow of cooling fluid P crossing the gap 7 is displaced with respect to the center line M of the braking band.

(55) According to an alternative embodiment, the median plane of the flow of cooling fluid crossing the gap 7 is displaced with respect to the center line M of the braking band by 0.75 mm.

(56) According to an alternative embodiment, the median plane of the flow of cooling fluid P crossing the gap 7 is displaced along the axial direction X-X towards the second plate 4 with respect to the center line M of the braking band 1.

(57) According to an alternative embodiment, each heat dissipation and connecting element 16, 17, 19 has two respective first and second connecting element ends 45, 46 at which the heat dissipation and connecting element is joined to the plates. Some of the heat dissipation and connecting elements 17 are associated with elongated ridges 47, 48 extending from at least one of the first and second connecting element ends 45, 46 in at least one given direction.

(58) The elongated ridges 47, 48 are integrally formed with said heat dissipation and connecting elements 17 and at least one plate 3 or 4.

(59) The elongated ridges 47, 48 are raised from at least one inner surface between the first and second inner surfaces 5, 6 of the first and second plates 3, 4, and emerge from at least one of the first and second inner surfaces 5 or 6 by a height, which is inferior to the axial distance between the first and second inner surfaces 5, 6 or to the gap height 7.

(60) According to an alternative embodiment, the elongated ridges 47 are elongated ridges extending according to circumferential or tangential directions.

(61) According to an alternative embodiment, three elongated ridges 47, 48 are associated with each of said some heat dissipation and connecting elements 17, two of which 47 extend according to two opposite directions in circumferential direction C-C, and a third elongated ridge 48, which extends in radial direction R-R.

(62) According to an alternative embodiment, three elongated ridges 47,48 are associated with each of said some heat dissipation and connecting elements 17, two of which 47 extend according to two opposite directions in circumferential direction C-C, and a third elongated ridge 48, which extends in a radially outer direction until it is close to an outer peripheral edge of the plates 3,4.

(63) According to an alternative embodiment, each elongated ridge 47, 48 has a convex profile, according to an axial section plane.

(64) The present invention further relates to a disk brake disk 2 comprising a braking band 1 as defined by any one of the embodiments described above and a hub of a vehicle 50 or a bell 33 associated with said braking band 1 and adapted to connect to a wheel hub of a vehicle.

(65) The present invention further relates to a vehicle comprising a disk for a disk brake 2 according to any one of the embodiments described.

LIST OF REFERENCE NUMERALS

(66) 1 braking band 2 disk brake disk 3 plate or first plate or outer plate 4 plate or second plate or outer plate 5 first plate or outer plate inner surface 6 second plate or inner plate inner surface 7 gap 8 outer plate surface or first outer plate surface or outer plate outer surface 9 outer plate surface or second outer plate surface or inner plate outer surface 10 first plate or outer plate first braking surface 11 second plate or inner plate second braking surface 12 plate or outer plate 13 plate or inner plate 14 plate or first plate or outer plate thickness 15 plate or second plate or inner plate thickness 16 heat dissipation and T-pillar connecting element 17 heat dissipation and comet pillar connecting element 18 first pillar rank 19 heat dissipation and rhomboidal pillar connecting element 20 first plate or outer plate axial thickness 21 second plate or inner plate axial thickness 23 second pillar rank 24 third pillar rank 25 brake pad 26 attachment portion of the braking band to a hub of a vehicle 50 or a bell 27 attachment portion connection seat for the connection to a hub of a vehicle 50 or a bell 28 radial connection seat height 29 recesses placed between adjoining attachment portions 33 bell 35 outer band edge 36 attachment portion wall 37 side wall portion 38 bottom wall portion 39 inner end wall portion 40 cylindrical bottom arch 41 cylindrical end arch 42 first attachment portion surface or outer attachment portion surface 43 second attachment portion surface or inner attachment portion surface 44 attachment portion axial thickness 45 first connection element end 46 second connection element end 47 circumferential or tangential elongated connection element ridge 48 radial elongated ridge 49 attachment portion bevel 50 vehicle hub 51 threaded portions 52 fixing nuts A-A braking band or brake disk rotation axis X-X rotation axis or axial direction R-R radial direction C-C circumferential direction T-T tangential direction D1 inner braking surface diameter D2 outer braking surface diameter H band height P median plane of the flow of cooling fluid M braking band center line or axial section plane L distance between the inner end wall portion 39 and the closed perimeter of the connection seat I distance between the bottom wall portion and the first plate braking surface