METHOD FOR TESTING AN AIRCRAFT BRAKE DISC SPECIMEN AND ASSOCIATED TOOLING.

Abstract

The invention relates to a test method for characterizing the behavior of a carbon brake disc for an aircraft landing gear, this brake disc being annular in shape around an axis and comprising an outer edge and an inner edge, at least a first of said edges comprising at least one notch comprising an axially traversing notch and at least one metal rider covering at least one side of said notch, characterized in that it successively comprises: - a step a) of cutting an angular sector of disc comprising said at least one notch to form a test piece, - a step b) of mechanically stressing said test piece, said stress being applied at least to the metal rider of said notch. Figure for abstract: Figure 10

Description

Title of the invention: METHOD FOR TESTING AN AIRCRAFT BRAKE DISC SPECIMEN AND ASSOCIATED TOOLING. Technical field of the invention

[0001] The invention relates to a testing method for characterizing the behavior of a carbon brake disc for an aircraft landing gear, and a tool implementing this testing method. Technical background

[0002] A braking system for an aircraft landing gear is an assembly enclosed in a rim of the landing gear and comprising inside this rim a multi-disc brake having several carbon discs. It comprises for example an alternation of fixed annular carbon discs which are connected to a hub of the landing gear by their inner edges and rotating carbon discs which are rotationally connected to the rim by their outer edges. The fixed and movable carbon discs, stacked one after the other, are pressed against each other by a series of hydraulic pistons which are arranged substantially in a circle in contact with a thrust plate by which an end disc urges all the others.

[0003] To ensure its connection to the hub or the rim, each carbon disc has on its inner or outer edge a series of notches which are distributed angularly in a regular manner. Between each outer notch, a bar or a tenon secured to the wheel transmits the rotational force of the wheel to the movable carbon disc. Between each inner notch, a rib secured to the hub transmits the fixed force of the hub to the fixed carbon disc.

[0004] Such a braking system is called a "heat sink" since its function is to dissipate the kinetic energy of the aircraft into heat (thermal energy). This braking system is generally enclosed, so that it is as difficult to observe as it is to instrument.

[0005] There are few test methods aimed at analyzing the causes of failure of such discs. The most conclusive is a so-called "notch by notch" test which consists of pressing the disc between a flat support and a bell on top to immobilize this disc in rotation. A "finger" shaped tool is actuated by a jack to apply a stress on a notch circumferentially to the disc and makes it possible to quantify the mechanical strength of a notch. This test can be repeated at each of the notches. The disadvantage of this type of test is that, due to the need to enclose the disc in the bell in order to allow its connection to a bar or a tenon, it is not or very difficult to possible to instrument the disk or observe the consequences of the test as the test proceeds.

[0006] Furthermore, the connection between the notches and the tenons or bars is a hyperstatic system. The behavior of the materials used is non-linear. The geometry of the connection zones between the notches and the bars or tenons does not allow the simple use of instruments such as gauges or thermocouples.

[0007] There is therefore a real need for a test method making it possible to characterize the behavior of a carbon disc of an aircraft braking system in response to static and fatigue stresses, in an accessible manner. Summary of the invention

[0008] The invention meets this need by proposing a test method for characterizing the behavior of a brake disc, consisting of carrying out a test on a test piece cut from the brake disc and placed in a simple tool aimed at recreating the stresses to which the disc is subjected in the context of its actual use.

[0009] For this purpose, the invention proposes a test method for characterizing the behavior of a brake disc, for example a carbon brake disc for an aircraft landing gear, this brake disc being annular in shape around an axis and comprising an outer annular edge and an inner annular edge, at least a first of said edges comprising at least two notches between which is formed an axially traversing notch and at least one metal rider covering at least one side of said notch of substantially radial orientation, characterized in that it successively comprises:

[0010] - a step a) of cutting an angular sector of the brake disc comprising said at least one notch to form a test piece,

[0011] - a step b) of mechanical stressing of said test piece, said stress being applied to one of the notches via the metal rider.

[0012] According to other characteristics of the method:

[0013] — the brake disc is made of carbon for an aircraft landing gear

[0014] - step b) comprises: • a sub-step bl) of fixing one end of a first arm of a tensile machine to the test piece, • a sub-step b2) of bringing one end of a second arm of the traction machine into contact with the metal rider of the test piece, and • a sub-step b3) during which the traction machine exerts traction between the first and second arms in the two opposite directions of the same traction direction.

[0015] - during sub-step bl) the end of the first arm is fixed to the test piece in a fixing area between its inner and outer edges,

[0016] - during sub-step b3) traction is exerted in the traction direction, said direction of traction passing through said fixing zone and being oriented tangentially relative to the axis (A) of the brake disc,

[0017] - the traction carried out in step b3) is a static traction (for example static cycled and fatigue) or vibratory or cycled traction,

[0018] — the traction is a static traction with a view to a rupture test,

[0019] — traction is an alternating traction in a range of values ​​below a threshold damage to the carbon material of the disc for fatigue testing,

[0020] - the method comprises at least one step c) during which measurements are made of deformations and / or displacements of the specimen around the notch,

[0021] — step c) is preferably carried out simultaneously with step b3),

[0022] - during step c) the deformations are measured by analysis or correlation digital image and / or acoustic emission control,

[0023] - step c) is carried out in a hot environment (temperature higher than example at 50°C, or even 100°C), or cold (temperature lower than, for example, 20°C). The hot environment can be obtained by carrying out step c) in a furnace or by induction. Step c) can also be carried out with or without a neutral atmosphere.

[0024] The invention also relates to a test tool for implementing the method of the type described above, characterized in that it comprises: • a first element comprising a first tie rod and a first member aligned with said tie rod and configured to be fixed to the test piece, • a second element comprising a second tie rod and a second member configured to bear on the rider of the test piece, and • a traction machine comprising a first and a second arm aligned in the same direction and linked to the first and second tie rods to exert traction on the test piece.

[0025] According to other characteristics of the test tool:

[0026] - the first member comprises a clamp comprising two jaws applied on two opposite faces of the test piece, said jaws being capable of being held tight against said faces by a clamping system,

[0027] — the clamping system comprises: • at least one screw of a first diameter which passes through coaxial holes of the same first diameter passing through the jaws and which is configured to pass through the test piece with clearance, and • a nut associated with said at least one screw,

[0028] — said screw comprises a head bearing on a first of the jaws and receives a nut which rests on a second of the jaws,

[0029] — the clamping system comprises between 6 and 10 screws distributed regularly over one or more rows,

[0030] — there are 8 screws distributed in a rectangular grid,

[0031] - the second member comprises a finger with an axis parallel to the axis of the brake disc which is configured to be received in the notch of the test piece in contact with said at least one rider,

[0032] - the finger is cylindrical, and it passes through coaxial holes formed in said branches of said fork,

[0033] - the second element comprises a fork comprising two parallel branches spaced apart from each other by a distance greater than a thickness of the test piece, between which said finger is mounted,

[0034] - the test tool comprises a positioning system configured to position said finger on the rider,

[0035] - the positioning system comprises a third branch which is carried by the second element, which extends along a second of the edges of the test piece opposite the first edge comprising said notches, and which is crossed by at least one adjustment screw capable of urging said second edge to urge the notch against the finger,

[0036] — the positioning system comprises at least two spaced adjustment screws from each other according to the direction of traction,

[0037] - a PTFE pad is interposed between said at least one adjustment screw and said second edge of the test piece,

[0038] - the finger of the second organ is cylindrical, and it passes through coaxial holes formed in said branches of said fork.

[0039] The invention finally relates to a test piece configured to be subjected to the testing method of the type described above using tooling of the type described above, characterized in that it comprises at least in its fixing zone a drilling of a second diameter which is greater than the first diameter of the at least one screw of the clamping system.

[0040] According to another characteristic of the test piece, the second diameter is greater than the first diameter by at least one tenth of a millimeter. Brief description of the figures

[0041] Other characteristics and advantages of the invention will appear during the reading of the detailed description which follows for the understanding of which reference will be made to the appended drawings in which:

[0042] [Fig-1] [Fig.l] is a perspective view of an aircraft brake;

[0043] [Fig.2] [Fig.2] is a side view of a brake disc for the brake of [Fig.l];

[0044] [Fig.3] [Fig.3] is a detailed perspective view of the brake disc of [Fig.2] and a test tube cut out there;

[0045] [Fig.4] [Fig.4] is a side view of the test piece of [Fig.3];

[0046] [Fig.5] [Fig.5] is a perspective view of a test tool comprising a test piece placed in a tool according to the invention;

[0047] [Fig.6] [Fig.6] is a perspective view from a first viewing angle of a first embodiment of a part of the tooling according to the invention;

[0048] [Fig.7] [Fig.7] is a perspective view from a second viewing angle of the first embodiment of the part of the tooling according to the invention;

[0049] [Fig.8] [Fig.8] is a perspective view of a second embodiment of the part of the tooling according to the invention;

[0050] [Fig.9] [Fig.9] is a detailed view of the deformations undergone by the test piece around a notch;

[0051] [Fig. 10] [Fig. 10] is a block diagram illustrating the steps of a test method according to the invention. Detailed description of the invention

[0052] [Fig.l] shows the components of an aircraft brake 10 also known as a "heat sink".

[0053] In a known manner, such a brake 10 is an assembly enclosed in a rim 12 of the landing gear, the trace of which has been schematically represented in dotted lines in [Fig.l].

[0054] Such a brake 10 is a multi-disc brake having several carbon discs 14, 16 of axis A. It comprises for example an alternation of fixed annular carbon discs 14 which are connected to a hub 11 of the landing gear by their inner annular edges 18 and rotating carbon discs 16 which are connected in rotation to the rim by their outer annular edges 20. The fixed 14 and mobile 16 carbon discs, stacked one after the other, are pressed against each other, via an annular thrust plate 24 by a series of hydraulic pistons 22 which are arranged in a circle in contact with an end disc 14.

[0055] To ensure its connection to the hub 11 or to the rim 12, each carbon disc 14, 16 has on its inner edge 18 or outer edge 20 a series of notches 26, 28 distributed angularly in a regular manner.

[0056] [Fig. 2] illustrates by way of example an annular movable disc 16 of axis A which has on its outer edge 20 a series of notches 28 distributed angularly in a regular manner. The disc 16 only has notches 28 on its outer edge 20, its inner edge 18 being devoid of notches.

[0057] Between two notches 28 appears a notch 30 passing axially through the disc 16 and at least one metal rider 32 covering at least one side 34 of this notch 30, which extends substantially in the radial direction. In the example shown here, each notch 30 has two radial sides 34 joined by a transverse edge 36. As can be seen in more detail in [Fig. 3], each side 34 is covered by a rider 32 which is riveted in the disc 16 by means of rivets 38 and a plate 40 which covers the transverse edge 36 and which is taken under the riders 32.

[0058] The notches are intended to cooperate with bars or tenons (not shown) formed on the external periphery of the hub 11 or in the internal periphery of the rim 12 to ensure the connection of the disc 14 or 16 concerned to this hub 11 or to this rim 12.

[0059] Such a braking system being enclosed in the rim 12 of the aircraft, it is difficult to observe and instrument.

[0060] There are currently no test methods that allow the disc to be instrumented or the consequences of the test to be observed as the test progresses, on the one hand because the brake 10 is enclosed in the rim and is not accessible, and on the other hand because the connection geometry between a notch and a stud does not allow the simple use of conventional instruments such as gauges or thermocouples.

[0061] The invention remedies this problem by proposing a test method for characterizing the behavior of a carbon disc of an aircraft braking system in response to static, cyclic and / or fatigue stresses, in an accessible manner. The invention will be described here with reference to a movable disc 16, but it will be understood that it could be applied to a fixed disc 14 without changing the nature of the invention.

[0062] In accordance with the invention, as illustrated in Figures 10 and 2 to 5, a testing method according to the invention firstly comprises a step a) of cutting an angular sector 42 of angle a of the disc 16 comprising at least one notch 28 to form a test piece 44. More particularly, once an angular sector 42 of the disc 16 has been cut as shown in [Fig. 4], the remaining part of the inner edge 18 of the disc 16 is cut in a rectilinear manner opposite the notch 30 perpendicular to an axis of symmetry XI of the notch. This makes it possible to provide an inner edge 46 of the notch which is rectilinear, as shown in figures 2 and 3 and which will be, as explained in the remainder of this description, used for holding the test piece 44. The test piece extends along an angular sector which corresponds to the angular sector 42 of the disc 16 once the inner edge 46 has been cut.The test piece therefore has an outer edge which corresponds to the outer edge 20 of the disc 16.

[0063] Then, as illustrated in Figures 10 and 5, the method comprises a step b) of mechanical stressing of the test piece 44, this stress being applied at least to the notch 28 by means of its metal rider 32.

[0064] In the context of the invention, the stress is preferably a tensile stress. For this purpose, step b) more particularly comprises a sub-step b1) of fixing one end 48 of a first arm 50 of a traction machine 52 to the test piece 44. Then, the method comprises a sub-step b2) of bringing one end 54 of a second arm 56 of the traction machine 52 into contact with the metal rider 32 of the test piece 44.

[0065] Then during a sub-step b3) the traction machine 52 exerts traction between the first and second arms 50, 56 in the two opposite directions of the same traction direction D. This traction has been represented in [Fig.5] by the forces F1 and F2.

[0066] To test the test piece 44, a test tool 58 is used which will now be described.

[0067] As illustrated in [Fig. 5], the test tool 58 firstly comprises the tensile machine 52, the first arm 50 and second arm 56 of which are aligned along the tensile direction D. To connect the test piece 44 to the tensile machine 52, the tool 58 generally comprises a first element 60 comprising a first tie rod 62 and a first member 64 aligned with the tie rod 62. The first tie rod 62 is fixed to the end 48 of the first arm 50 of the tensile machine 52 and the first member 64 is configured to be fixed to a fixing zone 43 of the test piece 44 comprised between its outer 20 and inner 46 edges, as illustrated in FIGS. 5 and 8.

[0068] The tool 58 further comprises a second element 66 comprising a second tie rod 68 and a second member 70 which is configured to come to bear on the rider 32 of the test piece 44. The second tie rod 68 is fixed to the end 54 of the second arm 56 of the traction machine 52.

[0069] The aim of the test method according to the invention is to recreate as faithfully as possible the stresses to which the disc 16 is subjected in operation, by applying them to the test piece 44.

[0070] To do this, during sub-step b1) the end 48 of the first arm 50 is fixed to the fixing zone 43 of the test piece 44 between its inner 46 and outer 20 edges, the end 54 of the second arm 56 of the traction machine 52 being supported on the metal rider 32 of the test piece 44. This makes it possible to exert on the rider 32 a force similar to the force exerted by each tenon on the disc 16, the fixing of the end 48 of the first arm 50 to the fixing zone 43 of the test piece 44 between its inner 46 and outer 20 edges making it possible to simulate the braking torque exerted by the discs on each other.

[0071] As this is a traction test in the two opposite directions of the same traction direction D, during sub-step b3), the traction direction D in which the traction is exerted necessarily passes through the fixing zone 43 to which the end 48 of the first arm 50 is fixed and is oriented tangentially relative to the axis A of the brake disc 16, to simulate the braking torque.

[0072] In order to recreate the conditions for using the brake disc 16, the attachment of the end 48 of the first arm 50 to the attachment zone 43 of the test piece 44 is not ensured by a connection of the embedding type, but by friction. For this purpose, the first member 64 comprises a clamp 72 comprising two jaws 74 applied to two opposite faces 76 of the attachment zone 43 of the test piece 44.

[0073] The jaws are capable of being held tight against these faces 76 by a clamping system.

[0074] Any configuration known from the state of the art may be suitable for the constitution of this clamping system. However, as illustrated in [Fig. 6], for reasons of space around the test piece 44, the clamping system comprises at least one screw 78 of a first diameter which passes through coaxial holes 80 of the same first diameter passing through the jaws 74. This screw 78 is configured to pass with play through the fixing zone 43 of the test piece, and it receives an associated nut 80 which makes it possible to clamp the jaws 74 against each other.

[0075] Preferably, the clamping system comprises between 6 and 10 screws 78 distributed regularly over one or more rows. In the non-limiting example embodiment which has been shown here, the clamping system comprises 8 screws distributed in the area according to a rectangular grid pattern.

[0076] Several configurations can be envisaged so that the screw(s) 78 pass through the zone 43 with play, such as slots made in the fixing zone 43 of the test piece 44.

[0077] However, preferably, as illustrated in Figures 3 and 4, the fixing zone 43 comprises a bore 82 of a second diameter which is greater than the first diameter of each screw 80 of the clamping system. The second diameter is for example one tenth of a millimeter greater than the first diameter, a sufficient dimension so that the screws 80 do not touch the bores 82 and that consequently the fixing of the zone 43 of the test piece 44 to the first member 64 is ensured solely by the pinching of the two jaws 74 of the clamp 72. In the exemplary embodiment which has been shown in Figures 2 and 3, the zone 43 of the test piece 44 therefore comprises 8 bores 82.

[0078] Still with regard to recreating the conditions for using the brake disc 16, the attachment of the end 54 of the second arm 56 of the traction machine 52 to the metal rider 32 of the test piece 44 must recreate the conditions for stressing the notch 28 by a tenon of the rim. This is why the second member 70 comprises a finger 84 with an axis parallel to the axis A of the disc 16, which is configured to face the notch 28 of the test piece 44 and in contact with the rider 32.

[0079] The finger 84 is intended to allow the second element 66 to rest on the notch 30 via the clip 32. For this purpose, as illustrated in FIGS. 6 and 8, the second element 66 comprises a fork 86 comprising two parallel branches 88 spaced apart from each other by a distance greater than a thickness of the test piece 44, between which the finger 84 is mounted.

[0080] The finger 84 could be welded between the branches 88 of the fork 86. However, to facilitate the positioning of the finger 84 in the notch 30, the finger 84 is cylindrical, and it passes through coaxial holes 90 formed in the branches 88 of said fork 86. It has on one side a head 92 with a diameter greater than the holes 90 to bear on one of the branches 88 of the fork and it is crossed, at the back of the other branch 88, by a pin 94 immobilizing it against this other branch 88.

[0081] This configuration is obviously not limiting of the invention and the finger 84 and its pin 94 could be replaced by a screw and a nut.

[0082] The finger 84 is advantageously mounted on the branches 88 so as to be able to adjust its height and therefore its position in the notch 30.

[0083] The shape (a cylinder) and the material of the finger 84 are advantageously chosen so that its mechanical behavior (in stiffness and in bending) reproduces as much as possible that of a bar secured to the rim of the wheel.

[0084] It is important that, during the test, the finger 84 cannot escape from the notch 30. For this purpose, the tooling comprises a positioning system 96 configured to position the finger 84 in the notch 28.

[0085] For this purpose, this positioning system 96 comprises a third branch 98 which is also carried by the second element 66. This third branch 98 is substantially parallel to the branches 88 of the fork 86 and it extends along the second edge 46 of the test piece 44, as shown in [Fig. 8]. The third branch 98 is crossed by at least one adjustment screw 100 capable of urging the second edge 46 to urge the notch 28 against the finger 84 so that it rests in abutment against the transverse edge 36 of the notch 28.

[0086] Preferably, the positioning system 96 comprises at least two adjustment screws 100, distributed uniformly along the edge 42 of the test piece 44, in order to adjust the positioning of the test piece 44 and to prevent it from tilting around the finger 84. The axes X2 and X3 of these screws 100 pass for this purpose preferably on either side of the finger 84, as shown in FIGS. 7 and 8.

[0087] According to a first embodiment of the invention which has been shown in figures 6 and 7, the screws 100 are directly in contact with the edge 42 of the test piece 44. According to a second embodiment of the invention which has been shown in figures 5 and 8, a PTFE pad 101 also known under the name of Teflon® is interposed between the pressure screws 100 and the second edge 42 of the test piece 44. This configuration makes it possible to standardize the force exerted by the adjustment screws 100 along the edge 46 of the test piece 44.

[0088] In this configuration, the test tool 58 makes it possible to implement the test method according to the invention by subjecting the test piece 44 to a tensile stress.

[0089] The traction can be:

[0090] - traction with slow and continuous increase in force, until breaking,

[0091] - a cycled traction, with incremental increase in effort and relaxation before each increment, for example with an increment of 5 kN,

[0092] - repeated stress traction, with constant force, until breaking.

[0093] At the end of these tests, as illustrated in [Fig. 9], the method comprises at least one step c) during which deformations 102 undergone by the test piece 44 around said notch 28 are measured. This step c) can be carried out simultaneously with step b3). As a non-limiting example, [Fig. 9] shows the appearance of a crack 102 extending from the side 34.

[0094] In addition to a visual examination, the deformations can be measured and highlighted by digital image analysis or correlation and / or by acoustic emission control.

[0095] The invention therefore makes it possible to precisely characterize the operation of a carbon brake disc 16.

[0096] Although the preceding description has been made in relation to a movable disc with notches 28 on its outer edge, the invention applies in the same way to a disc, for example fixed, with notches on its inner edge 18.

Claims

Claims

1. Test method for characterizing the behavior of a brake disc (16), this brake disc (16) being annular in shape around an axis (A) and comprising an outer annular edge (20) and an inner annular edge (18), at least a first (20) of said edges (18, 20) comprising at least two notches (28) between which is formed an axially traversing notch (30) and at least one metal rider (32) covering at least one side (34) of said notch (30) of substantially radial orientation, characterized in that it successively comprises: - a step a) of cutting an angular sector (42) of the brake disc (16) comprising said at least one notch (30) to form a test piece (44), - a step b) of mechanically stressing said test piece (44), said stress being applied to one of the notches (28) via the metal rider (32).

2. Method according to the preceding claim, characterized in that step b) comprises: - a sub-step b1) of fixing one end (48) of a first arm (50) of a traction machine (52) to the test piece (44), - a sub-step b2) of bringing one end (54) of a second arm (56) of the traction machine (52) into contact with the metal rider (32) of the test piece (44), and - a sub-step b3) during which the traction machine (52) exerts traction between the first and second arms (50, 56) in the two opposite directions of the same traction direction (D).

3. Method according to the preceding claim, characterized in that: - during sub-step bl) the end (48) of the first arm (50) is fixed to the test piece (44) in a fixing zone (43) between its inner (46) and outer (20) edges, - during sub-step b3) traction is exerted in the traction direction (D), said traction direction passing through said fixing zone (43) and being oriented tangentially relative to the axis (A) of the brake disc (16).

4. Test method according to claim 2 or 3, characterized in that the traction carried out in step b3) is a static traction or a vibratory or cyclic traction.

5. Test method according to one of the preceding claims, characterized in that it comprises at least one step c) during which deformations (102) and / or displacements of the test piece (44) around the notch (30) are measured.

6. Test method according to the preceding claim, characterized in that during step c) the deformations are measured by digital image analysis or correlation and / or by acoustic emission control.

7. Test method according to one of the preceding claims, characterized in that step c) is carried out in a hot or cold environment.

8. Test tool (58) for implementing a method according to one of the preceding claims, characterized in that it comprises: • a first element (60) comprising a first tie rod (62) and a first member (64) aligned with said tie rod (62) and configured to be fixed to the test piece (44), • a second element (66) comprising a second tie rod (68) and a second member (70) configured to bear on the rider (32) of the test piece (44), and • a traction machine (52) comprising a first and a second arm (50, 56) aligned in the same direction (D) and linked to the first and second tie rods (62, 68) to exert traction on the test piece (44).

9. Test tool (58) according to the preceding claim, characterized in that the first member (64) comprises a clamp (72) comprising two jaws (74) applied to two opposite faces (76) of the test piece (44), said jaws (74) being capable of being held tight against said faces (76) by a clamping system comprising at least one screw (78).

10. Test tool (58) according to claim 8 or 9, characterized in that the second member (70) comprises a finger (84) with an axis parallel to the axis (A) of the brake disc (16), which is configured to be received in the notch (30) of the test piece (44) in contact with said at least one rider (32).

11. Test tool (58) according to the preceding claim, characterized the second element (66) comprises a fork (86) comprising two parallel branches (88) spaced apart from each other by a distance greater than a thickness of the test piece (44), between which said finger (84) is mounted.

12. Test tool (58) according to claim 10 or 11, characterized in that it comprises a positioning system (96) configured to position said finger (84) on the rider (32).

13. Test tool (58) according to the preceding claim, characterized in that the positioning system (96) comprises a third branch (98) which is carried by the second element (66), which extends along a second of the edges (46) of the test piece (44) opposite the first edge (20) comprising said notches (28), and which is crossed by at least one adjustment screw (100) capable of urging said second edge (46) to urge the notch (28) against the finger (84).

14. Test tool (58) according to the preceding claim, characterized in that a PTFE pad (101) is interposed between said at least one adjustment screw (102) and said second edge (46) of the test piece (44).

15. Test piece (44) configured to be subjected to the testing method according to one of claims 1 to 5 using a tool (58) according to claim 9, characterized in that it is formed by cutting an angular sector (42) of the brake disc (16) comprising said at least one notch (30), and that it comprises at least one bore (82) of a second diameter which is greater than the first diameter of the at least one screw (78) of the clamping system.

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