Brake band and brake disc

Abstract

The object of the present invention is a brake band (1) comprising a brake band body (3) having an inner radial band edge (4) and an opposite outer radial band edge (5); said brake band body (3) comprises a first vehicle-side braking surface (6) and a second opposite braking surface (7); said brake band body (3) comprises at least one brake band ventilation duct (8); wherein in a first inner edge on the vehicle side (10) there is a first band toothing (12); in a second inner edge opposite the vehicle side (11) there is a second band toothing (16) distinct from said first band toothing (12).

Description

Brake band and brake disc'DESCRIPTION

[0001] , Field of the invention

[0002] , The present invention relates to braking devices comprising brake discs suitable for vehicles.

[0003] , In particular, the present invention relates to a brake disk comprising a brake bell and a braking band coupled to each other with teeth.

[0004] , Prior art

[0005] , In a disc brake, the brake caliper is generally arranged astride the outer peripheral edge of a brake disk, suitable for rotating about an axis of rotation (X-X) defining an axial direction (A-A). In a disc brake, a radial direction (RR) is also defined, substantially orthogonal to said axial direction (XX), and a tangential direction (CC) or circumferential direction (CC), in each of its points orthogonal both to said axial direction (XX) and to said radial direction (RR).

[0006] , The brake calipers are constrained to a support structure that remains stationary with respect to the vehicle wheel, such as a spindle of a vehicle suspension or a hub of a vehicle wheel or a fork. The brake caliper usually comprises a caliper body having two elongated portions arranged so as to face opposite braking surfaces of a brake disk, and at least one bridge that connects said two elongated portions to each other. The calipers, when properly actuated, press the pads against the braking band, and the braking action is produced by the friction between the pads and the braking band of the brake disk.

[0007] , Brake discs are known in which the bell is made of a material different from that of the braking band, for example, braking bands made of carbon-containing material, and bells made of aluminum or steel, or in deformed steel sheet and shaped like a cup and provided with a circumferential toothing for coupling to the braking band.

[0008] , Such brake discs, which we can call composites, allow, for example, a lower weight and thus contribute to reducing the weight of the unsprung masses of the relative vehicle.

[0009] , The known state of the art relating to the dragging of brake bands in carbon- containing material, or carbon-carbon, can be traced back to three macro-families: dragging with bushings, dragging with teeth, dragging with extended teeth.

[0010] , In the drag with bushings, the drag takes place through "bushing" (bobbin) elements that interface between "brake band" and "bell" which, in turn, is connected to the wheel hub. Its main problem lies in the fact that in the area of the bushings adequate ventilation of the band cannot be achieved, due to the need to leave sufficient material which has the task of conferring the necessary structural solidity to the components. For high torques / powers and the consequent increase in the number / size of the bushings, the component suitable for cooling the braking band is further penalized. This constructive solution provides for having areas dedicated to ventilation alternating with areas dedicated to dragging, effectively limiting one over the other.

[0011] , A brake disk of this type is known, for example, from WO2020128963A1.

[0012] , Furthermore, document WO2020128963A1 discloses a disc brake whose braking band has internal radial protrusions for connection, by means of guide elements, to a drag bell placed side by side.

[0013] , In toothed dragging, the dragging occurs through a form fit (the toothing) which occupies part of the thickness of the brake band. This solution involves using part of the thickness of the band to drag the brake band and part of the thickness of the brake band to ventilate the disk.

[0014] , The form-fitting coupling that determines the drag is realized directly between the bell element and the brake band without the need for further elements.

[0015] , This solution overcomes the concept of dragging with bushings, so that it is possible to have separation between the dragging area and the area dedicated to the ventilation / cooling of the disk.

[0016] , The limit of this solution lies in the fact that for materials of the band that are not sufficiently robust, the dragging part must in any case be of generous dimensions, taking part of the space to the ventilation or being very bulky, something incompatible with the limited space present inside a wheel rim of a vehicle.

[0017] , Furthermore, by dragging only one side of the ventilated braking band, during braking, bending stresses are triggered on the braking band itself, stresses that should be avoided.

[0018] , A brake disk of this type is known, for example, from EP3147529A1.

[0019] , The drag with extended toothing occurs through a form fit (the toothing) which occupies the entire thickness of the brake band.

[0020] , In this embodiment, similarly to that with bushes, there is an alternation between areas of the band intended for the dragging function with areas intended for the passage of air and the cooling of the disk itself. The direct bell / band coupling allows to reduce, but not eliminate, the areas in which the ventilation of the disk cannot be achieved as occurs in the drag with bushes.

[0021] , A brake disk of this type is known, for example, from BR102018073672A2.

[0022] , In particular, document BR102018073672A2 discloses a brake disk comprising a brake band or friction ring of the ventilated type, in which the inner edge facing the axis of rotation is closed by a toothed ring portion.

[0023] , Other solutions are known from EP1801448A1, WO2018050821 A1.

[0024] , However, these known solutions are not very suitable for applications where the braking band is the resistant but at the same time fragile material, such as, for example, braking bands made of carbon (also known as carbon-carbon) or in carboceramic. In fact, in this case, connecting and guiding elements that are anchored to the braking band are to be avoided, creating localized areas of great stress and high risk of breakage.

[0025] , Furthermore, one of the most significant problems encountered when dragging the aforementioned brake band solutions made of fragile material by means of dragging elements, typically dragging bells or brake bells, is the fact that it is not possible to simultaneously drag both sides of the ventilated brake band, leaving the central part of the inner edge of the brake band free, which is usually the area of the brake band most dedicated to ventilation.

[0026] , Solution

[0027] , Aim, therefore, of the present invention is to provide a brake band for a brake disc which provides a toothed connection to a brake bell and which allows the dragging of both sides of the brake band, but, at the same time, avoids occluding the ventilation passages of the brake band.

[0028] , This and other objects and advantages are achieved with a brake band according to claim 1 and a brake disk according to claim 13.

[0029] , Some advantageous embodiments are the subject of the dependent claims.

[0030] , From the analysis of this embodiment it has emerged that the proposed embodiment makes it possible to obtain a brake band and a brake disk in which the support between the band and the bell is axially distributed.

[0031] , Thanks to the proposed solutions, it is also possible to minimize the non-ideal mass distribution to resist and minimize the thermal distortions generated by the heating of the brake band and, at the same time, the ventilation and above all a heat exchange between the brake band and the cooling air is not compromised.

[0032] , The coupling between the parts of the bell, made with toothed couplings, guarantees the structural integrity and correct rigidity of the brake band and guarantees the best possible coupling between disc and bell.

[0033] , Furthermore, thanks to the proposed solutions, and in particular a bell that can be separated into two or more parts, it is possible to mount and replace the brake band once the pre- established wear limits have been reached.

[0034] , Thanks to the proposed solutions it is possible to divide the "brake bell" element, which has the task of connecting the braking band to the wheel hub, into two or more distinct components that can be assembled together, hereinafter referred to as the first part of the bell, or simply "bell", and the second part of the bell, or simply "external driver".

[0035] , The dragging of the brake band takes place on the outer bands of the latter, not affecting the central area which is completely dedicated to the ventilation I cooling of the disk. In this way, the dragging area is separated from the ventilation area, being able to develop / modify them according to the needs without mutual interference.

[0036] , Compared to a toothed drive of the prior art which generally has a monolithic bell that drags only one part of the band, this embodiment is able to drag both parts of the braking band, in fact being more robust and allowing the transmission of higher torques, but at the same time not going to the detriment of ventilation. It goes without saying that this aspect leads to a different constructive form deriving from the need to have the bell split, or in several parts, to be reassembled, once the braking band has been positioned on the bell.

[0037] , Some of the elements constituting this embodiment can be made by mechanical machining by chip removal, in particular the bell.

[0038] , The driver could be made with the aid of laser, water or other technology suitable for maintaining the shape and the appropriate tolerances required for the piece.

[0039] , Another advantage of the proposed embodiment compared to traditional toothed driving mechanisms is that of having the driving compartment closed axially (that is, in the axial direction A-A) and not passing on both sides of the braking band. In this way the dragging structure is more robust than a traditional one which has an axially "open" tooth, and allows to have greater resistance with less thickness at the same size.

[0040] , The axially closed compartment structure allows a further advantage in terms of ventilation because it allows to exploit the volume contained between the two faces on which the braking band is dragged to increase the available exchange surface with respect to a traditional drag.

[0041] , A variant of the basic scheme of the solution provides for the integration in a single element of an axial sealing ring and an external driver.

[0042] , Compared to the solution in separate parts, the elimination of a physical component facilitates the management of the components.

[0043] , This variant enables weight savings at the expense of greater manufacturing complexity which requires machining by removal of material also for the realization of the integrated driver.

[0044] , Figures

[0045] , Further characteristics and advantages of the device will appear from the following description of its preferred embodiment examples, given by way of non-limiting example, with reference to the accompanying figures in which:

[0046] , - Figure 1 illustrates a disc brake disk in axonometric view from the vehicle side, according to a first embodiment;

[0047] , - Figure 2 represents the disc of Figure 1 in axonometric view from the wheel side;

[0048] , - Figure 3 illustrates a side view of the disk of Figure 1 ;

[0049] , - Figure 4 shows a section according to a plane containing a circumferential and radial direction in the centerline of the disc of Figure 1 ;

[0050] , - Figure 5 illustrates in axonometric projection with separate parts the braking band and the brake bell of the disc of Figure 1 from the wheel side;

[0051] , - Figure 6 shows a detail of the brake band and brake bell coupling of the disc ofFigure 1 in a section according to a plane containing an axial direction and a radial direction and passing through the teeth of the brake bell and in which the ventilation ducts are highlighted which from the inside of the brake bell allow a flow of ventilation air towards the second bell teeth, as well as the large bell ventilation windows that allow the flow of air to the ventilation opening of the brake band, here made as a plurality of holes arranged in a quincunx;

[0052] , - Figure 7 illustrates a detail of the brake band and brake bell coupling of the disc ofFigure 1 in a section according to a plane containing an axial direction and a radial direction and passing through the centerline of the brake bell teeth and in which the large bell ventilation windows are highlighted which allow the flow of air to the ventilation opening of the brake band, here made as a plurality of holes arranged in a quincunx;

[0053] , - Figure 8 illustrates a detail of the brake band and brake bell coupling of the disk ofFigure 1 in a section according to a plane containing an axial direction and a radial direction and passing through the centerline of removable connecting devices between the second part of the bell and the wall of the second bell teeth, here a bell stud, where a spacer element of said second bell teeth wall is in the foreground;

[0054] , - Figure 9 shows a detail in separate parts of the brake band coupling and brake bell of the disk of Figure 1 in a section according to a plane containing an axial direction and a radial direction;

[0055] , - Figure 10 shows, from a different point of view more shifted towards the vehicle side, a detail in separate parts of the coupling of the brake band and brake bell of the disc of Figure 1 in a section according to a plane containing an axial direction and a radial direction;

[0056] , - Figure 11 shows, according to a different point of view shifted towards the wheel side, a detail in separate parts of the coupling of the brake band and brake bell of the disc of Figure 1 in a section according to a plane containing an axial direction and a radial direction;

[0057] , - Figure 12 illustrates a disc brake disc in axonometric view from the vehicle side, according to a second embodiment;

[0058] , - Figure 13 shows the disc of Figure 12 in an axonometric view from the wheel side;

[0059] , - Figure 14 illustrates a side view of the disk of Figure 12;

[0060] , - Figure 15 shows a section according to a plane containing a circumferential and radial direction in the center of the disc of Figure 12;

[0061] , - Figure 16 illustrates in axonometric projection with separate parts the brake band and the bell of the disk of Figure 12 from the wheel side;

[0062] , - Figure 17 shows a detail of the brake band coupling and brake bell of the disc ofFigure 12 where the brake band alone is sectioned in a section according to a plane containing an axial direction and a radial direction and passing through depressions of teeth of the brake bell;

[0063] , - Figure 18 shows an axonometric view of a disc brake from the vehicle side to which a brake caliper is associated, placed astride the braking band and in which a car hub is associated with the brake bell.

[0064] , Description of some preferred embodiments

[0065] , According to a general embodiment, a brake disk 2, comprising a brake bell 100 and a braking band 1.

[0066] , In accordance with a general embodiment of the invention, a braking band 1 of a brake disk 2 comprises a brake band body 3.

[0067] , Said brake band body 3 is suitable to rotate around an axis of rotation X-X, an axis of rotation which defines an axial direction A-A, a radial direction R-R orthogonal to said axial direction A-A and intersecting said axis of rotation X-X, a circumferential direction C-C, concentric to said axis of rotation X-X and, at an intersection point between said axial direction A-A and said radial direction R-R, said circumferential direction C-C being orthogonal to both said axial direction A-A and said radial direction R-R.

[0068] , Said brake band body 3 comprises an inner radial band edge 4 and an outer radial band edge 5 which delimit internally and externally said brake band body 3, respectively.

[0069] , The terms "internally" and "externally" refer to the position with respect to a radial direction traveled away from said axis of rotation X-X.

[0070] , Said brake band body 3 comprises a first vehicle-side braking surface 6 and a second opposite braking surface 7.

[0071] , Said opposed braking surfaces 6, 7 are arranged parallel to each other and in respective planes. Each of these planes comprises said radial R-R and circumferential C-C directions.

[0072] , Said opposed braking surfaces 6, 7 are adapted to cooperate with brake pads housed in a brake caliper 129 adapted to be placed astride the outer edge of said braking band 1, so as to bring said brake pads facing said opposed braking surfaces 6, 7.

[0073] , Said brake band body 3 comprises at least one brake band ventilation duct 8 which delimits at least one ventilation opening 9 which connects the inner radial band edge 4 with the outer radial band edge 5.

[0074] , For example, in accordance with one embodiment, said ventilation opening is a plurality of through holes that pass through said brake band body in a radial-circumferential plane from its inner edge to its outer edge.

[0075] , Always in accordance with said general embodiment, said inner radial band edge 4 and said first braking surface 6, or their extensions, meet in a first inner edge on the vehicle side 10.

[0076] , The term "edge" refers to a region of the band body which is arranged in proximity to the intersection between the plane containing the braking surface and the inner radial band edge, so as to face both in the radial direction (towards the axis of rotation) and in the axial direction (away from the band body).

[0077] , Said inner radial band edge 4 and said second braking surface 7, or their extensions, meet in a second inner edge on the side opposite the vehicle 11.

[0078] , Advantageously, said first inner edge on the vehicle side 10 comprises a first band toothing 12.

[0079] , With further advantage, said second inner edge on the side opposite the vehicle 11 comprises a second band toothing 16 distinct from said first band toothing 12.

[0080] , In accordance with an embodiment, said first band toothing 12 comprises first toothing protrusions 13 interspersed with first toothing recesses 14.

[0081] , Said first toothing protrusions 13 and said first toothing recesses 14 are distributed along the circumferential extension C-C of said first inner edge on the vehicle side 10.

[0082] , According to one embodiment, said first toothing recesses 14 face in the axial direction A-A outwards, that is, from the opposite side of said brake band body 3.

[0083] , According to one embodiment, said first toothing recesses 14 are delimited internally by a first toothing recess edge 15.

[0084] , According to an embodiment, each of said first toothing recess edges 15 delimits in axial direction A-A the respective first toothing recess 14.

[0085] , According to one embodiment, said second band toothing 16 comprises second toothing protrusions 17 interspersed with second toothing recesses 18.

[0086] , According to an embodiment, said second toothing protrusions 17 and said second toothing recesses 18 are distributed along the circumferential extension CC of said second inner edge on the opposite side of the vehicle 11.

[0087] , According to an embodiment, said second toothing recesses 18 face in the axial direction A-A outwards, that is, from the opposite side of said brake band body 3.

[0088] , According to one embodiment, said second toothing recesses 18 are delimited internally by a second toothing recesses edge 19.

[0089] , According to one embodiment, each of said second toothing recesses edges 19 delimits in axial direction A-A the respective second toothing recesses 18.

[0090] , According to one embodiment, said first toothing recesses 14 and said second toothing recesses 18 do not communicate with each other in the axial direction A-A.

[0091] , According to one embodiment, said first toothing protrusions 13 and said first toothing recesses 14 are distributed along the circumferential extension C-C of said first inner edge vehicle side 10 with regular alternation avoiding interruptions.

[0092] , According to one embodiment, said second toothing protrusions 17 and said second toothing recesses 18 are distributed along the circumferential extension C-C of said second inner edge opposite the vehicle side 11 with regular alternation avoiding interruptions.

[0093] , According to one embodiment, said brake band body 3 is in one piece.

[0094] , With the term "single piece", it is understood that the brake band body is not made up of several parts assembled together by means of removable connection means, such as screws or bolts or snap connections, but is produced directly as a single piece.

[0095] , According to an embodiment, said first band toothing 12 comprises a first band toothing engagement surface 20 which has the direction orthogonal thereto contained in a plane comprising the radial direction R-R and the circumferential direction C-C.

[0096] , According to one embodiment, said second band toothing 16 comprises a second band toothing engagement surface 21 having the direction orthogonal thereto contained in a plane comprising the radial direction R-R and the circumferential direction C-C.

[0097] , According to one embodiment, all said first toothing recess edges 15 lie on the same plane comprising the same radial direction R-R and the same circumferential direction C-C.

[0098] , According to one embodiment, all said second toothing recess edges 19 lie on the same plane comprising the same radial direction R-R and the same circumferential direction C-C.

[0099] , According to one embodiment, said first band toothing 12 and I or said second band toothing 16 comprises a first and I or second band toothing engagement surface 20 or 21 shaped with a "spline" shape in its circumferential development CC.

[0100] , The term "spline" means a surface that contains a line which, in mathematics, is a function, consisting of a set of polynomials connected together, the purpose of which is to interpolate a set of points (called nodes of the spline) in an interval, so that the function is continuous at least up to a given order of derivatives at each point of the interval.

[0101] , According to one embodiment, said spline surface shape is intended to be applied to the sides of the teeth and to the recesses.

[0102] , According to one embodiment, said first band toothing 12 and I or said second band toothing 16 comprises a first and I or second band toothing engagement surface 20 or 21 shaped with a "spline" shape in its circumferential extension CC and with the ends of all the protrusions 13 lying on a single cylindrical surface concentric to the axis of rotation XX.

[0103] , According to one embodiment, said at least one brake band ventilation duct 8 are a plurality of ventilation ducts comprising a plurality of ventilation through holes 22.

[0104] , According to one embodiment, said at least one brake band ventilation duct 8 are a plurality of ventilation ducts comprising a plurality of ventilation through holes 22 and said plurality of through holes 22 are a plurality of series of through holes and each series of through holes is distributed in a plane containing a radial direction R-R and a circumferential direction C-C.

[0105] , According to an embodiment, said at least one brake band ventilation duct 8 are a plurality of ventilation ducts comprising a plurality of ventilation through holes 22. Said plurality of through holes 22 are a plurality of series of through holes in which the series are arranged parallel to each other.

[0106] , According to one embodiment, said at least one brake band ventilation duct 8 is a plurality of ventilation ducts comprising a plurality of ventilation through holes 22. Said plurality of through holes 22 are a plurality of series of through holes in which the series are arranged parallel to each other and through holes 22 of adjacent and adjacent series are arranged in quincunx.

[0107] , According to one embodiment, said at least one brake band ventilation duct 8 are a plurality of ventilation ducts comprising a plurality of ventilation through holes 22. Said plurality of through holes 22 are a plurality of series of through holes. Said plurality of through holes 22 of each set avoids intersecting with through holes of an adjacent set.

[0108] , According to one embodiment, said brake band body 3 comprises composite material.

[0109] , According to one embodiment, said brake band body 3 comprises carbon-containing material.

[0110] , According to one embodiment, said brake band body 3 comprises carbon-ceramic- containing material.

[0111] , According to one embodiment, said brake band body 3 comprises a material containing reinforcing fibers, for example carbon-containing fibers and / or glass fibers.

[0112] , According to one embodiment, said first band toothing 12 and second band toothing 16 are contained within planes lying on said parallel braking surfaces 6, 7.

[0113] , According to one embodiment, said first inner edge on the vehicle side 10 and said second inner edge on the opposite side of the vehicle 11 are connected to said braking surfaces 6, 7 by each interposing a circumferential band channel 23, 24.

[0114] , According to one embodiment, said inner radial band edge 4 in its portion affected by said at least one brake band ventilation duct 8 has a toroidal channel shape 25, that is, a channel whose envelope surface resembles the outer portion of the toroidal surface.

[0115] , The present invention also relates to a brake disk 2 comprising a brake band according to any one of the previously described embodiments.

[0116] , According to one embodiment, said brake disk further comprises a brake bell 100.

[0117] , Said brake bell 100 comprises a first bell teeth 106 which meshes with said first band toothing 12.

[0118] , Said brake bell 100 comprises a second bell teeth 109 which meshes with said second band toothing 16.

[0119] , According to one embodiment, said brake bell 100 is a brake bell 100 for connecting a braking band 1 of a brake disk 2 to a hub 101 of a vehicle 102.

[0120] , According to an embodiment, said brake bell 100 is suitable for rotating about an axis of rotation XX, an axis of rotation which defines an axial direction AA, a radial direction RR orthogonal to said axial direction AA and intersecting said axis of rotation XX, a circumferential direction CC, concentric to said axis of rotation XX and, at an intersection point between said axial direction AA and said radial direction RR, orthogonal to both said axial direction AA and said radial direction RR.

[0121] , According to one embodiment, said brake bell 100 comprises at least a first bell part 103.

[0122] , According to one embodiment, said brake bell 100 comprises at least a second bell part 104.

[0123] , According to one embodiment, said first part of the bell 103 and said second part of the bell 104 are connected to each other in a separable manner by means of detachable bell connection devices 105.

[0124] , According to one embodiment, said first part of the bell 103 comprises said first bell teeth 106.

[0125] , According to an embodiment, said first bell teeth 106 comprise first bell teeth protrusions 107 interspersed with first bell teeth recesses 108.

[0126] , According to an embodiment, said first bell teeth protrusions 107 and said first bell teeth recesses 108 are distributed along a circumferential extension CC so as to interface with said braking band 1.

[0127] , According to one embodiment, said second bell part 103 comprises said second bell teeth 109 distinct from said first bell teeth 106.

[0128] , According to one embodiment, said second bell teeth 109 comprise second bell teeth protrusions 110 interspersed with second bell teeth recesses 111.

[0129] , According to one embodiment, said second bell teeth protrusions 110 and said second bell teeth recesses 111 are distributed along a circumferential extension CC so as to interface with said braking band 1.

[0130] , According to a general embodiment, a brake bell 100 for connecting a braking band 1 of a brake disk 2 to a hub 101 of a vehicle 102, comprises the following features.

[0131] , Said brake bell 100 is suitable for rotating about an axis of rotation XX, an axis of rotation which defines an axial direction AA, a radial direction RR orthogonal to said axial direction AA and intersecting said axis of rotation XX, a circumferential direction CC, concentric to said axis of rotation XX and, at an intersection point between said axial direction AA and said radial direction RR, orthogonal to both said axial direction AA and said radial direction RR.

[0132] , Said brake bell 100 comprises at least a first bell part 103.

[0133] , Said brake bell 100 comprises at least a second bell part 104.

[0134] , Said first bell part 103 and said second bell part 104 are connected to each other in a separable manner by means of detachable bell connection devices 105.

[0135] , Advantageously, said first part of the bell 103 comprises a first bell teeth 106 suitable for connecting to a braking band 1.

[0136] , Said second part of the bell 103 comprises a second bell teeth 109 distinct from said first bell teeth 106 and adapted to connect to said braking band 1.

[0137] , According to one embodiment, said first bell teeth 106 comprise first bell teeth protrusions 107 interspersed with first bell teeth recesses 108.

[0138] , In accordance with an embodiment, said first bell teeth protrusions 107 and said first bell teeth recesses 108 are distributed along a circumferential extension CC so as to interface with said braking band 1.

[0139] , According to an embodiment, said second bell teeth 109 comprise second bell teeth protrusions 110 interspersed with second bell teeth recesses 111. Said second bell teeth protrusions 110 and said second bell teeth recesses 111 are distributed along a circumferential extension CC so as to interface with said braking band 1.

[0140] , According to one embodiment, said first bell teeth 106 comprise first bell teeth protrusions 107 interspersed with first bell teeth recesses 108. Said first bell teeth protrusions 107 and said first bell teeth recesses 108 are distributed regularly alternating with each other without interruption along a circumferential extension C-C, so as to interface with said braking band 1.

[0141] , According to one embodiment, said second bell teeth 109 comprise second bell teeth protrusions 110 interspersed with second bell teeth recesses 111. Said second bell teeth protrusions 110 and said second bell teeth recesses 111 are regularly distributed and alternating with each other without interruption along a circumferential extension C-C so as to interface with said braking band 1;

[0142] , According to an embodiment, said first bell teeth 106 comprise a first bell teeth wall 112 which at least partially covers and closes in axial direction A-A said first bell teeth 106 on the side opposite to the direction of engagement of said first bell teeth 106 with said braking band 1.

[0143] , According to an embodiment, said first bell teeth 106 comprise a first bell teeth wall 112 which at least partially covers and closes in axial direction A-A said first bell teeth 106 on the side opposite with respect to the direction of engagement of said first bell teeth 106 with said braking band 1; and wherein said first bell teeth wall 112 is a ring with an annular body.

[0144] , According to an embodiment, said first bell teeth 106 comprise a first bell teeth wall 112 which at least partially covers and closes in axial direction A-A said first bell teeth 106 on the side opposite to the direction of engagement of said first bell teeth 106 with said braking band 1; and wherein said first bell teeth wall 112 is a ring with an annular body and said ring is integral, that is, in a single piece with said first bell part 103.

[0145] , According to an embodiment, said second bell teeth 109 comprises a second bell teeth wall 113 which at least partially covers and closes in axial direction A-A said second bell teeth 109 on the opposite side with respect to the direction of engagement of said second bell teeth 109 with said braking band 1.

[0146] , According to one embodiment, said second bell teeth 109 comprise a second bell teeth wall 113 which at least partially covers and closes in the axial direction A-A said second bell teeth 109 on the side opposite with respect to the direction of engagement of said second bell teeth 109 with said braking band 1.

[0147] , Said second bell toothing wall 113 comprises spacer elements 120 which keep said second bell teeth wall 113 spaced at least in some of its parts from said second bell teeth 109 so as to create a bell cavity 121 between said second bell teeth wall 113 and said second bell teeth 109.

[0148] , According to one embodiment, said brake bell 100 comprises an inner side of the bell or bell interior 122 facing said axis of rotation XX.

[0149] , Said second bell teeth 109 comprise a second bell teeth wall 113 which at least partially covers and closes in axial direction A-A said second bell teeth 109 on the side opposite with respect to the direction of engagement of said second bell teeth 109 with said braking band 1.

[0150] , Said second bell teeth wall 113 comprises spacer elements 120 which keep said second bell teeth wall 113 spaced at least in some of its parts from said second bell teeth 109 so as to create a bell cavity 121 between said second bell teeth wall 113 and said second bell teeth 109.

[0151] , Said first bell part 103 comprises openings or through passages that connect said bell cavity 121 with said bell interior 122.

[0152] , According to an embodiment, said second bell teeth 109 comprises a second bell teeth wall 113 which at least partially covers and closes in axial direction A-A said second bell teeth 109 on the side opposite with respect to the direction of engagement of said second bell teeth 109 with said braking band 1 ; and wherein said second bell teeth wall 113 is a ring with an annular body.

[0153] , According to one embodiment, said second bell teeth 109 comprises a second bell teeth wall 113 which at least partially covers and closes said second bell teeth 109 in the axial direction A-A on the opposite side with respect to the direction of engagement of said second bell teeth 109 with said braking band 1; and wherein said second bell teeth wall 113 is one-piece, that is, in a single piece, with said second bell part 104.

[0154] , According to an embodiment, said second bell teeth 109 comprises a second bell teeth wall 113 which at least partially covers and closes said second bell teeth 109 in the axial direction A-A on the opposite side with respect to the direction of engagement of said second bell teeth 109 with said braking band 1; and wherein said second bell teeth wall 113 is a ring with an annular body; and wherein said second bell teeth wall 113 is a separate piece, that is, a piece removably connected by means of detachable connection devices 114, with said second bell part 104.

[0155] , According to an embodiment, said first bell part 103 and said second bell part 104 respectively have a first bell part teeth 115 and a second bell part teeth 116 which are engaged with each other and releaseably join said first bell part 103 and said second bell part 104.

[0156] , According to an embodiment, said first bell part 103 comprises at least one threaded connection seat 117.

[0157] , Said second bell part 104 comprises at least one through connection seat 118;

[0158] , at least one bell stud screw 119 is received in said through connection seat 118 and is screwed into said threaded connection seat 117, joining said first bell part 103 to said second bell part 104.

[0159] , According to one embodiment, said second bell teeth 109 comprises a second bell teeth wall 113 which at least partially covers and closes said second bell teeth 109 in the axial direction A-A on the opposite side with respect to the direction of engagement of said second bell teeth 109 with said braking band 1.

[0160] , Said second bell teeth wall 113 is a ring with an annular body; and wherein said second bell teeth wall 113 is a separate piece, that is, a piece removably connected by means of removable connection devices 114, with said second bell part 104.

[0161] , Said first bell part 103 comprises a plurality of threaded connection seats 117.

[0162] , Said removable connection devices 114 are stud screws housed in said threaded connection seats 117, arranging said second part of the bell 104 between said first part of the bell 103 and said wall of the second bell teeth 113.

[0163] , According to an embodiment, said first bell teeth 105 and said second bell teeth 109 are connected to each other by bell bridges 123 suitable for forming bell ventilation windows 124 suitable for allowing the passage of a flow of air through the brake bell 100 to reach at least one ventilation duct 8 of the braking band.

[0164] , According to an embodiment, said first bell teeth 106 and I or said second bell teeth 109 comprise a first and I or second bell teeth engagement surface 125, 126 shaped with a "spline" shape in its circumferential development C-C.

[0165] , According to an embodiment, said first bell teeth 106 and I or said second bell teeth 109 comprise a first and I or second bell teeth engagement surface 125, 126 shaped with a "spline" shape in its circumferential development CC and with the ends of the teeth of said first bell teeth 106 and I or said second bell teeth 109 lying on a single cylindrical surface concentric to the axis of rotation XX.

[0166] , According to one embodiment, said first bell teeth 106 and I or said second bell teeth 109 comprise protrusion openings 127 which form through openings in said teeth 106 and I or 109.

[0167] , According to one embodiment, said first bell teeth 106 comprise first bell teeth protrusions 107 interspersed with first bell teeth recesses 108.

[0168] , Said second bell teeth 109 comprise second bell teeth protrusions 110 interspersed with second bell teeth recesses 111.

[0169] , At least some of said first bell teeth protrusions 107 and said second bell teeth protrusions 110 comprise protrusion openings 127 that form through apertures.

[0170] , According to one embodiment, said first bell teeth 106 comprise first bell teeth protrusions 107 interspersed with first bell teeth recesses 108.

[0171] , Said second bell teeth 109 comprise second bell teeth protrusions 110 interspersed with second bell teeth recesses 111.

[0172] , All said protrusions of the first bell teeth 107 and said protrusions of the second bell teeth protrusions 110 comprise protrusion openings 127 which form through openings.

[0173] , According to one embodiment, said first bell part 103 and said second bell part 104 respectively have a first bell part teeth 115 and a second bell part teeth 116 which are engaged with each other and releasably join said first bell part 103 and said second bell part 104.

[0174] , Some teeth of said first bell part teeth 115 and I or of said second bell part teeth 116 comprise bell protrusion openings for connecting bell 128 which form through openings in said teeth.

[0175] , According to one embodiment, said second bell teeth 109 is a ring forming a toothed crown.

[0176] , Said brake bell 100 comprises a ring with an annular body which forms a wall of second bell teeth 113.

[0177] , Said second bell teeth wall 113 is a separate piece with respect to said first bell part 103 and with respect to said second bell teeth 109 with a ring gear.

[0178] , Said second bell teeth wall 113 is connected by means of removable connection devices 114 to said first bell part 103 by interposing between said second bell teeth wall 113 and said first bell part 103 said second bell teeth 109 with toothed crown, avoiding to bind directly to said second bell teeth 109 with toothed crown.

[0179] , According to one embodiment, said second bell teeth 109 is a ring forming a toothed crown.

[0180] , Said brake bell 100 comprises a ring with an annular body which forms a wall of second bell teeth 113.

[0181] , Said second bell teeth wall 113 is a separate piece with respect to said first bell part 103.

[0182] , Said second bell teeth wall 113 is in one piece, that is, of one piece, with said second bell teeth 109 with toothed crown.

[0183] , Said second bell teeth wall 113 is connected by means of removable connection devices 114 to said first bell part 103 by interposing between said second bell teeth wall 113 and said first bell part 103 said second bell teeth 109 with toothed crown.

[0184] , The present invention also relates to a brake disk 2 comprising a brake bell 100 as defined in any one of the previously described embodiments, as well as comprising a braking band 1 engaged with said first bell teeth 106 and second bell teeth 109.

[0185] , In accordance with an embodiment, said braking band 1 comprises the following features.

[0186] , A brake band body (3). Said brake band body 3 being suitable to rotate around an axis of rotation X-X, axis of rotation which defines an axial direction A-A, a radial direction R-R orthogonal to said axial direction A-A and intersecting said axis of rotation X-X, a circumferential direction C-C, concentric to said axis of rotation X-X and, at a point of intersection between said axial direction A-A and said radial direction R-R, said circumferential direction C-C being orthogonal to both said axial direction A-A and said radial direction R-R.

[0187] , Said brake band body 3 comprises an inner radial band edge 4 and an outer radial band edge 5 which delimit internally and externally said brake band body 3, wherein internally and externally means with respect to a radial direction moving away from said axis of rotation X-X.

[0188] , Said brake band body 3 comprises a first vehicle-side braking surface 6 and a second opposite braking surface 7; said opposed braking surfaces 6, 7 being arranged parallel to each other and in respective planes, each plane comprising said radial R-R and circumferential C- C directions; said opposite braking surfaces 6, 7 being adapted to cooperate with brake pads housed in a brake caliper 129 adapted to be placed astride the outer edge of said braking band 1, so as to bring said brake pads facing said opposed braking surfaces 6, 7.

[0189] , Said brake band body 3 comprises at least one brake band ventilation duct 8 which comprises at least one ventilation opening 9 which connects the inner radial band edge 4 with the outer radial band edge 5.

[0190] , Said inner radial band edge 4 and said first braking surface 6, or their extensions, meet in a first inner edge on the vehicle side 10.

[0191] , Said inner radial band edge 4 and said second braking surface 7, or their extensions, meet in a second inner edge on the side opposite the vehicle 11.

[0192] , Said first inner edge on the vehicle side 10 comprises a first band toothing 12 which meshes with said first bell teeth 106.

[0193] , Said second inner edge opposite the vehicle side 11 comprises a second band toothing 16 distinct from said first band toothing 12, and which meshes with said second bell teeth 109.

[0194] , In accordance with an embodiment, between said first band toothing 12 and said first bell teeth 106, when engaged with each other, there is a ventilation window for each tooth between the free end of each tooth and the depression in which it engages.

[0195] , To the embodiments described above, a person skilled in the art, in order to meet contingent and specific needs, may make numerous modifications, adaptations and replacement of elements with others functionally equivalent, without however departing from the scope of the following claims.REFERENCE LIST1 brake band2 brake disc3 brake band body4 inner radial band edge5 outer radial band edge6 vehicle-side braking surface7 opposite side or wheel side braking surface8 brake band ventilation duct9 ventilation opening10 first inner edge on the vehicle side11 second inner edge opposite the vehicle side12 first band toothing13 first toothing protrusions14 first toothing recesses15 first toothing recess edge16 second band toothing17 second dentition protrusions18 second denting recesses19 second toothing recess edge20 first band toothing engagement surface21 engagement surface of second band toothing22 through holes for ventilation23 circumferential band channel24 circumferential band channel25 toroidal channel100 brake bell101 hub102 vehicle103 first part of the bell104 second part of the bell105 disconnectable bell connecting devices106 first bell teeth107 protrusions of first bell teeth108 recesses of first bell teeth109 second bell teeth110 second bell toothing protrusions111 recesses of second bell teeth112 wall of first bell teeth113 wall of second bell teeth114 removable connection devices between the second part of the bell and the wall of the second bell toothing115 first bell part teeth116 second toothing of the bell part117 threaded connection seat118 through connection seat119 bell stud screw120 spacer elements121 bell cavity122 bell interior123 bell bridges124 bell ventilation windows125 first bell toothing meshing surface126 second bell toothing engagement surface127 protrusion openings128 bell connection protuberance openings129 brake caliperX-X axis of rotationA-A axial directionR-R radial directionCC circumferential direction

Claims

CLAIMS1. A brake band (1) of a brake disc (2) comprising a brake band body (3); said brake band body (3) being suitable for rotate around a rotation axis (X-X), which rotation axis defines an axial direction (A-A), a radial direction (R-R) orthogonal to said axial direction (A-A) and intersecting said rotation axis (X-X), a circumferential direction (C-C) concentric with said rotation axis (X-X), and at an intersection point between said axial direction (A-A) and said radial direction (R-R), said circumferential direction (C-C) being orthogonal to both said axial direction (A-A) and said radial direction (R-R); said brake band body (3) comprises an inner radial band edge (4) and an opposite outer radial band edge (5) which delimit said brake band body (3) internally and externally, respectively, wherein internally and externally mean with respect to a radial direction moving away from said rotation axis (X-X); said brake band body (3) comprises a first vehicle-side braking surface (6) and a second opposite braking surface (7); said surfaces (6, 7) being arranged parallel to each other and on respective planes, each plane comprising said radial (R-R) and circumferential (C-C) directions; said opposite braking surfaces (6, 7) being suitable for cooperate with brake pads housed in a brake caliper suitable for be placed straddling the outer edge of said brake band (1), so as to bring said brake pads to face said opposite braking surfaces (6, 7); wherein said brake band body (3) comprises at least one brake band ventilation duct (8) which comprises at least one ventilation opening (9) which puts the inner radial band edge (4) into communication with the outer radial band edge (5); said inner radial band edge (4) and said first braking surface (6), or the extensions thereof, meet at a first inner vehicle-side corner (10); said inner radial band edge (4) and said second braking surface (7), or the extensions thereof, meet at a second inner opposite-vehicle-side corner (11); and wherein said first inner vehicle-side corner (10) comprises a first band toothing (12); and wherein said second inner opposite-vehicle-side corner (11) comprises a second band toothing (16) distinct from said first band toothing (12).

2. A brake band (1) according to claim 1 , wherein said first band toothing (12) comprises first toothing protrusions (13) interspersed with first toothing recesses (14); wherein said first toothing protrusions (13) and said first toothing recesses (14) are distributed along the circumferential extension (C-C) of said first inner vehicle-side corner (10); and wherein said first toothing recesses (14) face in the axial direction (A-A) outwards, i.e., from the side opposite to said brake band body (3); and whereinsaid first toothing recesses (14) are internally delimited by a first toothing recess edge (15); wherein each of said first toothing recess edges (15) delimit the respective first toothing recess (14) in the axial direction (A-A); and / or wherein said second band toothing (16) comprises second toothing protrusions (17) interspersed with second toothing recesses (18); wherein said second toothing protrusions (17) and said second toothing recesses (18) are distributed along the circumferential extension (C-C) of said second inner opposite-vehicle-side corner (11); and wherein said second toothing recesses (18) face in the axial direction (A-A) outwards, i.e., from the side opposite to said brake band body (3); and wherein said second toothing recesses (14) are internally delimited by a second toothing recess edge (19); wherein each of said second toothing recess edges (19) delimits the respective second toothing recess (14) in the axial direction (A-A); and / or wherein said first toothing recesses (14) and said second toothing recesses (18) do not communicate with one another in the axial direction (A-A).

3. A brake band (1) according to claim 2, wherein said first toothing protrusions (13) and said first toothing recesses (14) are distributed along the circumferential extension (C-C) of said first inner vehicle-side corner (10) with regular alternation avoiding interruptions; and / or wherein said second toothing protrusions (17) and said second toothing recesses (18) are distributed along the circumferential extension (C-C) of said second inner opposite-vehicle-side corner (11) alter with regular alternation avoiding interruptions.

4. A brake band (1) according to any one of the preceding claims, wherein said braking body (3) is in one piece.

5. A brake band (1) according to any one of the preceding claims, wherein said first band toothing (12) comprises a first band toothing meshing surface (20) having the direction orthogonal thereto contained in a plane comprising the radial direction (R-R) and the circumferential direction (C-C); and / or whereinsaid second band toothing (16) comprises a second band toothing meshing surface (21) having the direction orthogonal thereto contained in a plane comprising the radial direction (R-R) and the circumferential direction (C-C).

6. A brake band (1) according to any one of claims 2 to 5, wherein all said first toothing recess edges (15) lie on the same plane comprising the radial direction (R-R) and the circumferential direction (C-C); and / or wherein all said second toothing recess edges (19) lie on the same plane comprising the radial direction (R- R) and the circumferential direction (C-C).

7. A brake band (1) according to any one of the preceding claims, wherein said first band toothing (12) and / or said second band toothing (16) comprise a first and / or second band toothing meshing surface (20 or 21) shaped like a "spline" in the circumferential extension (C- C) thereof; or wherein said first band toothing (12) and / or said second band toothing (16) comprise a first and / or second band toothing meshing surface (20 or 21) shaped like a "spline" in the circumferential extension (C- C) thereof and with the ends of all protrusions (13) lying on a single cylindrical surface concentric with the rotation axis (X-X).

8. A brake band (1) according to any one of the preceding claims, wherein said at least one brake band ventilation duct (8) is a plurality of ventilation ducts comprising a plurality of ventilation through-holes (22); or wherein said at least one brake band ventilation duct (8) is a plurality of ventilation ducts comprising a plurality of ventilation through-holes (22); said plurality of through-holes (22) is a plurality of series of through-holes, and each series of through-holes is distributed in a plane containing a radial (R-R) and a circumferential (C-C) direction; or wherein said at least one brake band ventilation duct (8) is a plurality of ventilation ducts comprising a plurality of ventilation through-holes (22); said plurality of through holes (22) is a plurality of series of through holes wherein the series are arranged parallel to one another; or wherein said at least one brake band ventilation duct (8) is a plurality of ventilation ducts comprising a plurality of ventilation through-holes (22);said plurality of through-holes (22) is a plurality of series of through-hole wherein the series are arranged parallel to one another and the through-holes (22) of adjoining and adjacent series are arranged in a quincunx; and / or wherein said at least one brake band ventilation duct (8) is a plurality of ventilation ducts comprising a plurality of ventilation through-holes (22); said plurality of through holes (22) of each series avoids intersecting with one another.

9. A brake band (1) according to any one of the preceding claims, wherein said brake band body (3) comprises a composite material; or wherein said brake band body (3) comprises a carbon-containing material; or wherein said brake band body (3) comprises a carbon ceramic-containing material; or wherein said brake band body (3) comprises a material containing reinforcing fibers, for example carbon- containing fibers.

10. A brake band (1) according to any one of the preceding claims, wherein said first band toothing (12) and second band toothing (16) are contained in planes lying on said parallel braking surfaces (6, 7).

11. A brake band (1) according to any one of the preceding claims, wherein said first inner vehicle-side corner (10) and said second inner opposite-vehicle-side corner (11) connect to said braking surfaces (6, 7) by interposing each a circumferential band channel (23, 24).

12. A brake band (1) according to any one of the preceding claims, wherein said inner radial band edge (4) in the portion thereof concerned by said at least one brake band vent duct (8) is shaped like a toroidal channel (25).

13. A brake disc (2) comprising a brake band according to any one of claims 1 to 12, wherein said brake disc further comprises a brake bell (100); and wherein said brake bell (100) comprises a first bell toothing (106) which meshes with said first band toothing (12); said brake bell (100) comprises a second bell teeth (109) which meshes with said second band toothing (16).

14. A brake disc (2) according to claim 13, wherein said brake bell (100) is a brake bell (100) for the connection of a brake band (1) of a brake disc (2) with a hub (101) of a vehicle (102); wherein said brake bell (100) is suitable for rotate about a rotation axis (X-X), which rotation axis defines an axial direction (A-A), a radial direction (R-R) orthogonal to said axial direction (A-A) and intersecting said rotation axis (X-X), a circumferential direction (C-C) concentric with said rotation axis (X-X), and at an intersection point between said axial direction (A-A) and said radial direction (R-R), orthogonal to both said axial direction (A-A) and said radial direction (R-R); said brake bell (100) comprises at least a first bell part (103); said brake bell (100) comprises at least a second bell part (104); wherein said first bell part (103) and said second bell part (104) are separably connected to each other by means of disconnectable bell connection devices (105); and wherein said first bell part (103) comprises said first bell toothing (106); said first bell toothing (106) comprises first bell toothing protrusions (107) interspersed with first bell toothing recesses (108); wherein said first bell toothing protrusions (107) and said first bell toothing recesses (108) are distributed along a circumferential extension (C-C) so as to interface with said brake band (1); and wherein and wherein said second bell part (103) comprises said second bell teeth (109) distinct from said first bell toothing (106); said second bell teeth (109) comprises second bell toothing protrusions (110) interspersed with second bell toothing recesses (111); wherein said second bell toothing protrusions (110) and said second bell toothing recesses (111) are distributed along a circumferential extension (C-C) so as to interface with said brake band (1).

Images