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

Abstract

A braking band extends between an inner diameter and an outer diameter. The braking band has two plates having inner surfaces delimiting a gap, outer surfaces having opposite flat circumferential portions and a plate body having an extension in axial direction. The plates are joined by connecting elements. At least one plate has at least one projection projecting into the gap without reaching the opposite plate, forming a localized narrowing of the gap and a thickening of the plate body, creating a localized increase of the thickness of plate. The projection extends from a first connecting element to an adjacent connecting element, connecting them, and along the circumferential direction, connecting at least two adjacent connecting elements. A group of projections extends circumferentially along a discontinuous annular path, avoiding a uniform distribution in circumferential direction.

Claims

1. A braking band of a disc for a disc brake of ventilated type, the braking band extending between an inner band diameter, close to a rotation axis (X-X) of the braking band, and an outer band diameter, far from the rotation axis (X-X), said rotation axis defining an axial direction (X-X); the braking band defining a radial direction (R-R) orthogonal to the axial direction (X-X), and a circumferential direction (C-C) orthogonal both to the axial direction (X-X) and to the radial direction (R-R); the braking band comprising two plates facing each other; said two plates comprising inner surfaces directly or indirectly facing each other and delimiting a gap; said two plates further comprising outer surfaces; said outer surfaces comprising opposite flat circumferential portions forming braking surfaces; said two plates further comprising a plate body having an extension in axial direction (X-X) or thickness of plate; said two plates being joined to each other by heat dissipation elements or connecting elements; said connecting elements being shaped as columns and/or ribs protruding from one plate towards the opposite plate in shape of connecting bridges of the plates; wherein at least one plate of the two plates comprises at least one projection projecting from said at least one plate into said gap without reaching an opposite plate, forming at least one localized narrowing of said gap and a thickening of the plate body, creating a localized increase of said thickness of plate; and wherein said at least one projection extends at least from a first connecting element to an adjacent connecting element, connecting said connecting elements; and wherein said at least one projection extends at least along said circumferential direction (C-C) connecting at least two adjacent connecting elements placed side-by-side in circumferential direction (C-C); and wherein a group of projections extends circumferentially along a discontinuous annular path, avoiding a uniform distribution in circumferential direction; wherein the group of projections extends circumferentially along discontinuous circular sectors, avoiding a closed annular path; wherein a discontinuous circular sector of projections and connection elements is circumferentially bounded by discontinuous circular sectors of only connection elements.

2. The braking band of claim 1, wherein: the connecting elements are grouped into at least two rows or lines arranged circumferentially; and wherein a first inner line of said at least two rows or lines is internally arranged in radial direction or towards said rotation axis (X-X) close to said inner band diameter; and wherein a second outer line of said at least two rows or lines is arranged outermost radially far from said rotation axis (X-X) close to said outer band diameter; and wherein at least a third line is radially arranged between said first inner line and said second outer line; and wherein at least two of said connecting elements are pillars having a circular-shaped section in a plane parallel to airflow along the gap; and wherein said at least one projection is at least a plurality of projections which connect the connecting elements of a same line; or wherein said at least one projection is at least a plurality of projections which connect the connecting elements of a same line limited to a circular sector; or wherein said at least one projection is at least a plurality of projections which connect the connecting elements of a same line limited to a plurality of circumferentially non-adjacent circular sectors; or wherein said at least one projection connects all connecting elements of all lines limited to a circular sector; or wherein said at least one projection connects all connecting elements of all lines limited to a plurality of circumferentially non-adjacent circular sectors.

3. The braking band of claim 1, wherein at least two of said connecting elements are tabs or ribs having an elongated-shaped section in a plane parallel to airflow along the gap, including in the radial direction (R-R).

4. The braking band of claim 1, wherein at least two of said connecting elements have a rhombus or diamond-shaped section with four vertexes joined by four sides in a plane substantially parallel to airflow along the gap, wherein said sides delimiting said section are rectilinear-shaped.

5. The braking band of claim 1, wherein said at least one projection projects into said gap from only one of said two plates.

6. The braking band of claim 1, wherein said at least one projection is at least two projections and said at least two projections project into said gap from both plates.

7. The braking band of claim 1, wherein said at least one projection is at least two projections and said at least two projections project into said gap from both plates and are facing each other.

8. The braking band of claim 1, said at least one projection is at least two projections and said at least two projections project into said gap from both plates and are at least partially offset from each other.

9. The braking band of claim 1, wherein: said at least one projection is at least a plurality of projections, each projection connecting two adjacent connecting elements of at least one circular sector.

10. The braking band of claim 1, wherein the group of projections extends circumferentially (C-C) along an annular discontinuous path, including an arc of a circumference of the braking band, or it extends circumferentially (C-C) along a plurality of non-adjacent arcs of the circumference the braking band.

11. The braking band of claim 1, wherein the group of projections extends circumferentially (C-C) for 1/10 of the circumference of the braking band, or it extends circumferentially (C-C) for a plurality of non-adjacent stretches, each stretch extending 1/10 of the circumference of the braking band.

12. The braking band of claim 1, wherein the group of projections extends circumferentially (C-C) for ⅛ of the circumference of the braking band, or it extends circumferentially (C-C) for a plurality of non-adjacent stretches, each stretch extending ⅛ of the circumference of the braking band.

13. The braking band of claim 1, wherein the group of projections extends circumferentially (C-C) for ⅙ of the circumference of the braking band, or it extends circumferentially (C-C) for a plurality of non-adjacent stretches, each stretch extending ⅙ of the circumference of the braking band.

14. The braking band of claim 1, wherein the group of projections extends circumferentially (C-C) for ¼ of the circumference of the braking band, or it extends circumferentially (C-C) for a plurality of non-adjacent stretches, each stretch extending ¼ of the circumference of the braking band.

15. The braking band of claim 1, wherein the group of projections extends circumferentially (C-C) for an even number of non-adjacent stretches.

16. The braking band of claim 1, wherein the group of projections extends circumferentially (C-C) for an odd number of non-adjacent stretches.

17. The braking band of claim 1, wherein: said at least one projection is a single projection extending for a circular sector and from proximity of the inner band diameter to proximity of the outer band diameter; or wherein said at least one projection is at least a plurality of circumferentially non-adjacent projections, each being a single projection extending for a circular sector and from proximity of the inner band diameter to proximity of the outer band diameter.

18. A disc of a disc brake comprising a braking band according to claim 1.

19. A vehicle comprising a braking band according to claim 1.

20. The braking band of claim 1, wherein a first discontinuous circular sector of projections and connection elements is radially opposite a second discontinuous circular sector of projections and connection elements, wherein said first and second discontinuous circular sectors are separated by discontinuous circular sectors of only connection elements.

21. The braking band of claim 1 wherein said discontinuous circular sector of projections and connection elements and said discontinuous circular sectors of only connection elements are adapted to dissipate vibration modes in the braking band.

Description

DRAWINGS

(1) Further features and advantages of the device, the disc brake and the vehicle will become apparent from the description provided below of preferred embodiments thereof, given by way of non-limiting examples, with reference to the accompanying drawings, in which:

(2) FIG. 1 depicts an axonometric view of a disc of disc brake according to the present invention, partially cross-sectioned along a plane passing through the axial and radial directions;

(3) FIG. 2 shows a plan view of the disc in FIG. 1, cross-sectioned along an average flow plane of the fluid flowing through the gap;

(4) FIG. 3 depicts an axonometric view of a detail of the outer edge of the disc in FIG. 1, from the radial direction towards the inside of the disc;

(5) FIG. 4 shows an axonometric view of a detail of the section in FIG. 2;

(6) FIG. 5 depicts a side view of the edge in FIG. 3, along the radial direction;

(7) FIG. 6 shows a plan view of a disc according to a further embodiment, cross-sectioned along an average flow plane of the fluid flowing through the gap;

(8) FIG. 7 depicts an axonometric view of a detail of the outer edge of the disc in FIG. 6, from the radial direction towards the inside of the disc;

(9) FIG. 8 shows an axonometric view of a detail of the section in FIG. 6;

(10) FIG. 9 depicts an axonometric view of a detail of the disc in FIG. 6, partially cross-sectioned along a plane passing through an axial and radial direction;

(11) FIG. 10 shows a plan view of a disc according to a further embodiment again, cross-sectioned along an average flow plane of the fluid flowing through the gap;

(12) FIG. 11 depicts an axonometric view of a detail of the outer edge of the disc in FIG. 10, from the radial direction towards the inside of the disc;

(13) FIG. 12 shows an axonometric view of a detail of the section in FIG. 10;

(14) FIG. 13 depicts an axonometric view of a detail of the disc in FIG. 10, partially cross-sectioned along a plane passing through an axial and radial direction.

DESCRIPTION OF SOME PREFERRED EMBODIMENTS

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

(16) Said braking band 1 extends between an inner diameter D1, close to a rotation axis X-X of the braking band 1, and an outer diameter D2, far from said rotation axis X-X. Said rotation axis defines an axial direction X-X.

(17) Said braking band 1 defines a radial direction R-R substantially orthogonal to said axial direction X-X, and a circumferential direction C-C orthogonal both to said axial direction X-X and to said radial direction R-R.

(18) Said braking band 1 comprises two plates 3, 4 facing each other.

(19) Said plates 3, 4 comprise inner surfaces 5, 6 directly or indirectly facing each other and delimiting a gap 7 which defines a ventilation duct for the braking band 1.

(20) Said plates 3, 4 comprise outer surfaces 8, 9.

(21) Said outer surfaces 8, 9 comprise opposite flat circumferential portions which form braking surfaces 10, 11. In other words, portions of the outer surfaces 8, 9 cooperate with brake pads housed in a brake caliper to exert a braking action when sandwiched against the braking band 1. The portion of the outer surfaces 8, 9 which is brushed or involved by the pads defines the braking surfaces 10, 11.

(22) Said plates 3, 4 comprise a plate body 12, 13 having an extension in axial direction X-X or thickness of plate 14, 15. In other words, when assessed in axial direction, each plate 3, 4 shows a thickness of plate 14, 15 which is given by the thickness in axial direction of the plate body 12 of plate 3, 4.

(23) Said plates 3, 4 are joined to each other by heat dissipation elements or connecting elements 16, 17, 18, 19 of the plates 3, 4.

(24) Said connecting elements 16, 17, 18, 19 are shaped as columns and/or ribs protruding from one plate towards the opposite plate in the shape of connecting bridges of the plates 3, 4.

(25) Advantageously, at least one of the plates 3; 4 comprises at least one projection 20, 21, 22 projecting from said plate 3; 4 into said gap 7 without reaching the opposite plate 4; 3.

(26) Said projection 20, 21, 22 forms at least one localized narrowing of said gap 7. In other words, travelling said gap 7, when said projection 20, 21, 22 is reached, a reduction is encountered of the section in axial direction X-X of the size of gap 7.

(27) Said projection 20, 21, 22 forms at least a thickening of the plate body 12; 13, thus creating a localized increase of said thickness of plate 14; 15. In other words, considering the thickness of the body of a plate in axial direction X-X, thickness 14, 15 increases at said projection 20, 21, 22.

(28) Said at least one projection 20, 21, 22 extends at least from a first connecting element 16, 17, 18, 19 to an adjacent connecting element 16, 17, 18, 19, thus connecting said connecting elements 16, 17, 18, 19 to one another.

(29) Said at least one projection 20, 21, 22 extends at least along said circumferential direction (C-C) connecting at least two adjacent connecting elements 16, 17, 18, 19 placed side-by-side in circumferential direction C-C.

(30) The group of each projection 20, 21, 22 extends circumferentially along a discontinuous annular path, avoiding a uniform distribution of the projections in circumferential direction.

(31) According to one embodiment, the group of each projection 20, 21, 22 extends circumferentially along discontinuous circular sectors, avoiding a closed annular path.

(32) According to one embodiment, said connecting elements 16, 17, 18, 19 are grouped into at least two rows or lines 23, 24, 25 arranged circumferentially.

(33) A first of said lines 23 is internally arranged in radial direction or towards said axis X-X close to said inner diameter D1.

(34) A second of said lines 24 is arranged outermost radially far from said axis X-X close to said outer diameter D2.

(35) At least a third of said lines 24 is radially arranged between said first inner line 23 and said second outer line 24.

(36) According to one embodiment, at least two of said connecting elements 16, 17, 18, 19 are pillars 26 which have a circular-shaped section in a plane substantially parallel to the airflow along gap 7 or ventilation channels.

(37) According to one embodiment, at least two of said connecting elements 16, 17, 18, 19 are fins 27 or ribs which have an elongated-shaped section, for example in radial direction R-R, in a plane substantially parallel to the airflow along gap 7 or ventilation channels.

(38) According to one embodiment, at least two of said connecting elements 16, 17, 18, 19 have a rhombus or diamond-shaped section with four vertexes 28 joined by four sides 29 in a plane substantially parallel to the airflow along gap 7 or ventilation channels, in which said sides delimiting said section are substantially rectilinear-shaped.

(39) According to one embodiment, said at least one projection 20, 21, 22 projects into said gap 7 from only one of said plates 3; 4.

(40) According to one embodiment, said at least one projection 20, 21, 22 is at least two projections 20, 21, 22 and said at least two projections 20, 21, 22 project into said gap 7 from both said plates 3, 4.

(41) According to one embodiment, said at least one projection 20, 21, 22 is at least two projections 20, 21, 22 and said at least two projections 20, 21, 22 project into said gap 7 from both said plates 3, 4 and face each other.

(42) According to one embodiment, said at least one projection 20, 21, 22 is at least two projections 20, 21, 22 and said at least two projections 20, 21, 22 project into said gap 7 from both said plates 3, 4 and are at least partially offset from each other. In other words, no part, or only a portion, of a first projection 20, 21, 22 of a first plate 3;4 faces a second projection arranged in the facing plate 4;3 in axial direction X-X.

(43) According to one embodiment, said at least one projection 20, 21, 22 is a plurality of projections 20, 21, 22 which connect two-by-two the connecting elements 16, 17, 18, 19 of at least one circular sector 30.

(44) According to one embodiment, said at least one projection 20, 21, 22 is a plurality of projections 20, 21, 22 which connect two-by-two the connecting elements 16, 17, 18, 19 of non-adjacent circular sectors 30.

(45) According to one embodiment, said at least one projection 20, 21, 22 is a plurality of projections 20, 21, 22 which connect two-by-two the connecting elements 16, 17, 18, 19 of a plurality of non-adjacent circular sectors 30.

(46) According to one embodiment, the group of said projections 20, 21, 22 extends circumferentially C-C along a discontinuous annular path, for example along an arc of the circumference of the braking band 1.

(47) According to one embodiment, the group of said projections 20, 21, 22 extends circumferentially C-C for a plurality of non-adjacent arcs of the circumference of the braking band 1.

(48) According to one embodiment, the group of said projections 20, 21, 22 extends circumferentially C-C for 1/10 (one tenth) of the circumference of the braking band 1.

(49) According to one embodiment, the group of said projections 20, 21, 22 extends circumferentially C-C for a plurality of non-adjacent stretches each extending 1/10 of the circumference of the braking band 1.

(50) According to one embodiment, the group of said projections 20, 21, 22 extends circumferentially C-C for ⅛ (one eighth) of the circumference of the braking band 1, or extends circumferentially C-C for a plurality of non-adjacent stretches each extending ⅛ of the circumference of the braking band 1.

(51) According to one embodiment, the group of said projections 20, 21, 22 extends circumferentially C-C for ⅙ (one sixth) of the circumference of the braking band 1, or extends circumferentially C-C for a plurality of non-adjacent stretches each extending ⅙ of the circumference of the braking band 1.

(52) According to one embodiment, the group of said projections 20, 21, 22 extends circumferentially C-C for ¼ (one quarter) of the circumference of the braking band 1, or extends circumferentially C-C for a plurality of non-adjacent stretches each extending ¼ of the circumference of the braking band 1.

(53) According to one embodiment, the group of said projections 20, 21, 22 extends circumferentially C-C for an even number of non-adjacent stretches.

(54) According to one embodiment, the group of said projections 20, 21, 22 extends circumferentially C-C for an odd number of non-adjacent stretches.

(55) According to one embodiment, said at least one projection 20, 21, 22 is a single piece without discontinuity, or in a single piece, which extends for a circular sector 30 and from the proximity of the inner band diameter D1 to the proximity of the outer band diameter D2.

(56) According to one embodiment, said at least one projection 20, 21, 22 is at least a plurality of circumferentially non-adjacent projections, each being a single projection which extends for a circular sector 30 and from the proximity of the inner band diameter D1 to the proximity of the outer band diameter D2.

(57) According to one embodiment, said at least one projection 20, 21, 22 is at least a plurality of projections which connect the connecting elements 16, 17, 18, 19 of a same line 23; 24; 25.

(58) According to one embodiment, said at least one projection 20, 21, 22 is at least a plurality of projections which connect the connecting elements 16, 17, 18, 19 of a same line 23; 24; 25, which considered as a whole, extend limited to a circular sector.

(59) According to one embodiment, said at least one projection 20, 21, 22 is at least a plurality of projections which connect the connecting elements 16, 17, 18, 19 of a same line 23; 24; 25, which considered as a whole, extend limited to a plurality of circumferentially non-adjacent circular sectors.

(60) According to one embodiment, said at least one projection 20, 21, 22 connects all the connecting elements 16, 17, 18, 19 of all the lines 23; 24; 25, which considered as a whole, extend limited to a circular sector.

(61) According to one embodiment, said at least one projection 20, 21, 22 connects all the connecting elements 16, 17, 18, 19 of all the lines 23; 24; 25, which considered as a whole, extend limited to a plurality of circumferentially non-adjacent circular sectors.

(62) The present invention also relates to a disc of disc brake comprising a braking band 1 according to any one of the embodiments described above.

(63) The present invention also relates to a vehicle comprising a braking band 1 according to any one of the embodiments described above.

(64) Those skilled in the art may make many changes, adaptations and replacements to the embodiments described above or can replace elements with others which are functionally equivalent in order to meet contingent needs without however departing from the scope of the appended claims.

(65) The group of projections 20, 21, 22 arranged close to one another forms a group of projections 20, 21, 22 which is arranged circumferentially, thus creating a circumferential distribution having circumferential discontinuities capable of creating a non-uniform distribution of the group of projections, a distribution adapted to avoid the presence of modes of vibration of the braking band 1 which, if driven into resonance, create disturbing noises or squealing noises.

LIST OF REFERENCES

(66) 1 braking band 2 disc of disc brake 3 plate 4 plate 5 inner surface 6 inner surface 7 gap 8 outer surface 9 outer surface 10 braking surface 11 braking surface 12 plate body 13 plate body 14 plate thickness 15 plate thickness 16 connecting elements 17 connecting elements 18 connecting elements 19 connecting elements 20 projection 21 projection 22 projection 23 lines 24 lines 25 lines 26 pillars 27 fins or ribs 28 rhombus or diamond with four vertexes 29 rhombus sides 30 circular sector X-X rotation axis and axial direction R-R radial direction C-C tangential direction D1 inner band diameter D2 outer band diameter