Fixing assembly comprising a clevis and a tang

Abstract

A clevis having a clevis pin 16, a clevis 12 with two prongs 14, 15, and a tang 13. Disposed radially between the bore 14a of the first prong 14 and the clevis pin 16 are two sleeving rings 19, 20 driven one into the other, one of the rings bearing a first lateral face 13a of the tang forming axial gap 23; and two rings 21, 22 similarly between the bore 15a of the second prong 15 and the clevis pin 16, one of the rings bearing a second lateral face 13b forming another axial gap 24. One 19, 21 of the two rings in each ring pairs 17, 18 may have radial flanges 25, 26 delimiting the axial spaces 23, 24. The other rings 20, 22 of the ring pairs may have 27, 28 radial flanges axially opposite the inner flanges 25, 26. Clevis may be carbon fibre reinforced thermoplastic thermosetting matrix. Tang may be metal.

Description

Title: Fixing assembly comprising a clevis and a tang Technical field of the invention The present invention generally concerns clevises and the assembly of a clevis fork and a tang to fix a clevis and a tang onto a clevis pin. To be more precise, the invention relates to a fixing assembly comprising a clevis pin, a clevis provided with two connecting portions, and a tang. Prior art As represented in figure 1, an existing fixing assembly 1 comprises a fork of a clevis 2 provided with two connecting portions 3 and 4, and a tang 5 mounted on a clevis pin 6 for fixing the clevis 2 and the tang 5 around the fixing axis X. The two connecting portions 3 and 4 are generally formed of a plastic material reinforced with carbon fibres and the tang is generally formed of a metal such as aluminium. Conventionally, two contact rings 7 and 8 are disposed radially between the clevis pin 6 and the connecting portions 3 and 4. The proximity and the contacts resulting from the fixing of the clevis 2 and the tang 5 lead to the appearance of galvanic corrosion at the interface between the connecting portions 3 and 4 and the tang 5. Now, this phenomenon leads to premature wear of the fixing assembly 1. In order to eliminate this risk of galvanic corrosion, it is known to deposit a layer 9, 10 of plastic material reinforced with glass fibres, generally in ply form, on the surface of the connecting portions 3 and 4 coming into contact with the tang 5. However, adding such a layer 9, 10 on the connecting portions of the clevis increases the weight of the fixing assembly 1. Given its nature and its manufacturing steps, the layer 9, 10 also makes producing the fixing assembly 1 particularly costly. Furthermore, the presence of glass fibres in the layer 9, 10 prevents recycling of the carbon fibres of the plastic material reinforced with carbon fibres of the connecting portions 3 and 4 of the clevis 2 after the fixing assembly 1 is discarded. Summary of the invention The invention therefore has for object remedying these disadvantages and proposing a simple and fast to implement configuration of a fixing assembly comprising a clevis pin, a clevis and a tang enabling elimination of the appearance of galvanic corrosion at the interface between the clevis and the tang. There is therefore proposed a fixing assembly comprising a clevis pin, a clevis provided with first and second connecting portions, and a tang, the first and second connecting portions of the clevis and the tang being positioned around said clevis pin, the tang being disposed on the clevis pin axially between the first and second connecting portions of the clevis. The fixing assembly further comprises: a first contact assembly disposed radially between the bore of the first connecting portion of the clevis and the clevis pin, the first contact assembly including first and second rings driven one into the other at least in part, the second ring being positioned in the bore of the first ring, at least one of the first and second rings coming to bear axially against a first lateral face of the tang or facing said first lateral face, and a second contact assembly disposed radially between the bore of the second connecting portion of the clevis and the clevis pin, the second contact assembly including third and fourth rings driven one into the other at least in part, the fourth ring being positioned in the bore of the third ring, at least one of the third and fourth rings coming to bear axially against a second lateral face of the tang or facing said second lateral face that is axially opposite the first lateral face of the tang, and a first axial space formed between the first connecting portion of the clevis and the first face of the tang, and - a second axial space formed between the second connecting portion of the clevis and the second face of the tang. In one embodiment, the first ring and / or the second ring may each come to bear axially against the first lateral face of the tang or facing said first lateral face, and the third ring and / or the fourth ring may each come to bear axially against the second lateral face of the tang or facing said second lateral face axially opposite the first lateral face of the tang. In accordance with one feature, the first ring and the second ring may comprise at least one axial portion provided with a front face in contact with the first lateral face of the tang or facing said first lateral face, and the third ring and the fourth ring may comprise at least one axial portion provided with a front face in contact with the second lateral face of the tang or facing said second lateral face. In accordance with an alternative, only one of the first and second rings may comprise at least one axial portion provided with a front face in contact with the first lateral face of the tang or facing said first lateral face, and only one of the third and fourth rings may comprise at least one axial portion provided with a front face in contact with the second lateral face of the tang or facing said second lateral face. In accordance with one embodiment, the first ring comprises a radial flange that extends radially in the first axial space, extends outward the axial portion and is provided with a contact surface in contact with the first lateral face of the tang or facing said first lateral face and extending radially outward the front face of the axial portion, and the third ring comprises a radial flange that extends radially in the second radial space, extends outward the axial portion and is provided with a contact surface in contact with the second lateral face of the tang or facing said second lateral face and radially extending outward the front face of the axial portion. The radial flange of the first ring preferably comprises a bearing surface axially opposite the contact surface and coming axially into contact with a first face of the first connecting portion of the clevis disposed facing the first lateral face of the tang, and the radial flange of the third ring preferably comprises a bearing surface axially opposite the contact surface and coming axially into contact with a first face of the second connecting portion of the clevis disposed facing the second lateral face of the tang. The second ring preferably further comprises a radial flange that extends outward the axial portion, and is provided with a bearing surface coming into contact with a second face of the first connecting portion of the clevis opposite a first face disposed facing the first lateral face of the tang, and the fourth ring preferably further comprises a radial flange that extends outward the axial portion and is provided with a bearing surface coming into contact with a second face of the second connecting portion of the clevis opposite a first face disposed facing the second lateral face of the tang. The periphery of the radial flange of the first ring and the periphery of the radial flange of the third ring may advantageously each include a chamfer. Alternatively or in combination, the periphery of the radial flange of the second ring and the periphery of the radial flange of the fourth ring may each comprise a chamfer. In another embodiment, the second ring may comprise a radial flange that extends radially in the first axial space, extends outward the axial portion and is provided with a contact surface in contact with the first lateral face of the tang or facing said first lateral face and extending radially outward the front face of the axial portion, and the fourth ring may comprise a radial flange that extends radially in the second radial space, extends outward the axial portion and is provided with a contact surface in contact with the second lateral face of the tang or facing said second lateral face and extending radially outward the front face of the axial portion. The radial flange of the second ring preferably comprises a bearing surface axially opposite the contact surface and coming axially into contact with a first face of the first connecting portion of the clevis disposed facing the first lateral face of the tang, and the radial flange of the fourth ring preferably comprises a bearing surface axially opposite the contact surface and coming axially into contact with a first face of the second connecting portion of the clevis disposed facing the second lateral face of the tang. The first ring preferably further comprises a radial flange that extends outward the axial portion and is provided with a bearing surface coming into contact with a second face of the first connecting portion of the clevis opposite a first face disposed facing the first lateral face of the tang, and the third ring preferably comprises a radial flange that extends outward the axial portion, and is provided with a bearing surface coming into contact with a second face of the second connecting portion of the clevis opposite a first face disposed facing the second lateral face of the tang. The periphery of the radial flange of the second ring and the periphery of the radial flange of the fourth ring may advantageously each comprise a chamfer. Alternatively or in combination, the periphery of the radial flange of the first ring and the periphery of the radial flange of the third ring may each comprise a chamfer. The material of the first and second connecting portions of the clevis advantageously comprises a thermoplastic or thermoset matrix reinforced by carbon fibres. The tang advantageously comprises a metal, such as aluminium or an aluminium alloy. Brief description of the figures Other aims, advantages and features will emerge from the following description given purely by way of illustration and with reference to the appended drawings, in which: [Fig 1] is a view in section of a prior art fixing assembly comprising a clevis and a tang. [Fig 2] is a view in section of a fixing assembly in accordance with one embodiment of the invention comprising a clevis and a tang. [Fig 3] is a view in section of a fixing assembly in accordance with another embodiment of the invention comprising a clevis and a tang. [Fig 4] is a view in section of a fixing assembly in accordance with another embodiment of the invention comprising a clevis and a tang. Detailed description of the invention Figure 2 depicts a fixing assembly 11 in accordance with a first embodiment of the invention. The fixing assembly comprises a clevis 12 and a tang 13. The clevis 12 comprises at least one forked end forming a clevis fork and including first and second connecting portions 14 and 15. The first connecting portion 14 includes a first face 14b and a second face 14c axially opposite the first face 14b. The thickness of the first connecting portion 14 is delimited by the first and second faces 14b and 14c. Similarly, the second connecting portion 15 comprises a first face 15b and a second face 15c axially opposite the first face 15b. The thickness of the second connecting portion 15 is delimited by the first and second faces 15b and 15c. The tang 13 and the first and second connecting portions 14 and 15 of the clevis 12 are positioned around a common clevis pin 16 of the assembly. The clevis pin 16 extends along an axis X. Furthermore, the tang 13 is disposed on the clevis pin 16 axially between the first and second connecting portions 14 and 15 of the clevis 12. The tang 13 comprises a first lateral face 13a and a second lateral face 13b axially opposite the first lateral face 13a of the tang 13. The first and second lateral faces 13a and 13b delimit the thickness of the tang 13. The tang 13 also comprises a bore 13c on which the exterior surface of the clevis pin 16 bears. The fixing assembly 11 further comprises first and second contact assemblies 17 and 18, respectively. The first contact assembly 17 is disposed radially between the clevis pin 16 and the bore 14a of the first connecting portion 14 of the clevis 12. The first contact assembly 17 comprises an exterior first ring 19 and an interior second ring 20 driven one into the other. The first ring 19 advantageously comprises an axial portion 19a including a bore 19b, an exterior surface 19c radially opposite the bore 19b, and axially opposite first and second front faces 19d and 19e that delimit the axial length of the axial portion 19a. The second ring 20 advantageously comprises an axial portion 20a including a bore 20b, an exterior surface 20c radially opposite the bore 20b, and axially opposite first and second front faces 20d and 20e that delimit the axial length of the axial portion 20a. The second ring 20 is positioned in the bore 19b of the first ring 19 so that the exterior surface 20c of the second ring 20 is positioned in contact with the bore 19b of the first ring 19. The second contact assembly 18 is disposed radially between the clevis pin 16 and the bore 15a of the second connecting portion 15 of the clevis 12. The second contact assembly 18 comprises an exterior third ring 21 and an interior fourth ring 22 driven one into the other. The third ring 21 advantageously comprises an axial portion 21a including a bore 21b, an exterior surface 21c radially opposite the bore 21b, and axially opposite first and second front faces 21d and 21e that delimit the axial length of the axial portion 21a. The fourth ring 22 advantageously comprises an axial portion 22a including a bore 22b, an exterior surface 22c radially opposite the bore 22b, and axially opposite first and second front faces 22d and 22e that delimit the axial length of the axial portion 22a. The fourth ring 22 is positioned in the bore 21b of the third ring 21 so that the exterior surface 22c of the fourth ring 22 is positioned in contact with the bore 21b of the third ring 21. The bore 20b of the axial portion 20 of the second ring 20 and the bore 22b of the axial portion 22 of the fourth ring 22 are positioned against the exterior surface of the clevis pin 16. The exterior surface 19c of the axial portion 19 of the first ring 19 and the exterior surface 21c of the axial portion 21 of the third ring 21 are respectively positioned against the bore 14a of the first connecting portion 14 and against the bore 15a of the second connecting portion 15. The first and second rings 19 and 20 are fixed to the fixing assembly 11 by a force fit between the first connecting portion 14 of the clevis 12 and the clevis pin 16. Similarly, the third and fourth rings 21 and 22 are fixed to the fixing assembly 11 by a force fit between the second connecting portion 15 of the clevis 12 and the clevis pin 16. In the example depicted in figure 2, the first ring 19 comes to bear axially against a first lateral face 13a of the tang 13 and the third ring 21 comes to bear axially against the second lateral face 13b of the tang 13. Furthermore, a first axial space 23 is formed between the first connecting portion 14 of the clevis 12 and the first face 13a of the tang 13. Similarly, a second axial space 24 is formed between the second connecting portion 15 of the clevis 12 and the second face 13b of the tang 13. Such a configuration of the fixing assembly 11 enables elimination by simple, fast and relatively low cost means of the risks of appearance of galvanic corrosion linked to the contacts between the clevis 12 and the tang 13. The contact between the first ring 19 and the tang 13 and the contact between the second ring 20 and the tang 13 respectively enable provision of the first axial space 23 and the second axial space 24 and thus maintain the first and second connecting portions 14, 15 of the clevis 12 at a distance from the tang 13. Furthermore, the presence of the first and second axial spaces 23 and 24 between the first and second connecting portions 14, 15 of the clevis 12 and the tang 13 eliminates the necessity to have a smooth surface on the first face 14b, 15b of the first and second connecting portions 14, 15. The manufacture of the fixing assembly 11 does not necessitate a step of remachining the first faces 14b and 15b of the first and second connecting portions 14, 15. The first and second connecting portions 14, 15 may be used directly as cast. The contact assembly 17 is installed by driving the first and second rings 19 and 20 between the first connecting portion 14 of the clevis 12 and the clevis pin 16, and the contact assembly 18 is installed by driving the third and fourth rings 21 and 22 into the second connecting portion 15 of the clevis 12. This force fit necessitates no additional means, such as glue, for fixing the contact assemblies 17 and 18. Installation is simple and rapid, without necessitating, as would be the case for example for fixing by gluing, a time to prepare the interior surface of the clevis 12 and the exterior surface of the clevis pin 16, nor any application, curing, or cleaning time. In the example depicted, the first and second rings 19 and 20 come to bear axially against the first lateral face 13a of the tang 13, and the third and fourth rings 21 and 22 come to bear axially against the second lateral face 13b of the tang 13. The first front face 19d of the axial portion 19a of the first ring 19 and the first front face 20d of the axial portion 20a of the second ring 20 are positioned in contact with the first lateral face 13a of the tang 13. Furthermore, the first front face 21d of the axial portion 21a of the third ring 21 and the first front face 22d of the axial portion 22a of the fourth ring 22 are positioned in contact with the second lateral face 13b of the tang 13. In the first embodiment depicted in figure 2, the first ring 19 comprises a radial flange 25 that extends radially in the first axial space 23. The radial flange 25 of the first ring 19 forms a radial portion of the first ring 19 extending outward the axial portion 19a and extending radially outward the first front face 19d of the axial portion 19a. The radial flange 25 of the first ring 19 is provided with a contact surface 19f in contact with the first lateral face 13a of the tang 13. In the example depicted, the radial flange 25 of the first ring 19 advantageously comprises a bearing surface 19g axially opposite the contact surface 19f and coming axially into contact with the first face 14b of the first connecting portion 14 of the clevis 12. Similarly, the third ring 21 comprises a radial flange 26 that extends radially in the second radial space 24. The radial flange 26 forms a radial portion of the third ring 21, extending outward the axial portion 21a and extending radially outward the first front face 21d of the axial portion 21a. The radial flange 26 of the third ring 21 is provided with a contact surface 2If in contact with the second lateral face 13b of the tang 13. In the example depicted, the radial flange 26 of the third ring 21 comprises a bearing surface 21g axially opposite the contact surface 21f and coming axially into contact with the first face 15b of the second connecting portion 15 of the clevis 12 disposed facing the second lateral face 13b of the tang 13. The second ring 20 preferably further comprises a radial flange 27 that extends outward the axial portion 20a, and is provided with a bearing surface 20f coming into contact with the second face 14c of the first connecting portion 14 of the clevis 12. The second front face 20e of the second ring 20 is extended by the radial flange 27. Similarly, the fourth ring 22 further comprises a radial flange 28 that extends outward the axial portion 22a, and is provided with a bearing surface 22f coming into contact with a second face 15c of the second connecting portion 15 of the clevis 12. The second front face 22e of the fourth ring 22 is extended by the radial flange 28. In the embodiment shown in figure 2, the front face 19d of the first ring 19, the contact surface 19f of the first ring 19 and the front face 20d of the second ring 20 are disposed in contact with the first lateral face 13a of the tang 13. In a variant embodiment, the front face 19d, the contact surface 19f of the first ring 19 and the front face 20d of the second ring 20 may be disposed facing the first lateral face 13a of the tang 13, a slight clearance possibly being present between the first lateral face 13a of the tang 13 and the first and second rings 19, 20. Similarly, in the embodiment shown in figure 2, the front face 21d of the third ring 21, the contact surface 21f of the third ring 21 and the front face 22d of the fourth ring 22 are disposed in contact with the second lateral face 13b of the tang 13. In a variant embodiment, the front face 21d and the contact surface 21f of the third ring 21 and the front face 22d of the fourth ring 22 may be disposed facing the second lateral face 13b of the tang 13, a slight clearance possibly being present between the second lateral face 13b of the tang 13 and the third and fourth rings 21, 22. As depicted in figure 3, in which elements identical to the first embodiment depicted in figure 2 bears the same references, the periphery of the radial flange 25 of the first ring 19 and the periphery of the radial flange 26 of the third ring 21 may each comprise a chamfer 33 and 34, respectively. The periphery of the radial flange 27 of the second ring and the periphery of the radial flange 28 of the fourth ring may advantageously also each comprise a chamfer. Figure 4 depicts a second embodiment of a fixing assembly 11 in which elements identical to the first embodiment depicted in figure 2 bear the same references. In the example depicted, the second ring 20 comprises a radial flange 29 that extends radially in the first axial space 23. The radial flange 29 of the second ring 20 extends outward the axial portion 20a and is provided with a contact surface 20g in contact with the first lateral face 13a of the tang 13 and extending radially outward the first front face 20d of the axial portion 20a. The radial flange 29 of the second ring 20 preferably comprises a bearing surface 20h axially opposite the contact surface 20g and coming axially into contact with the first face 14b of the first connecting portion 14 of the clevis 12. Similarly, the fourth ring 22 comprises a radial flange 30 that extends radially in the second radial space 24. The radial flange 30 extends outward the axial portion 22a and is provided with a contact surface 22g in contact with the second lateral face 13b of the tang 13 and radially extending outward the first front face 22d of the axial portion 22a. The radial flange 30 of the fourth ring 22 preferably comprises a bearing surface 22h axially opposite the contact surface 22g and coming axially into contact with a first face 15b of the second connecting portion 15 of the clevis 12. The first ring 19 preferably further comprises a radial flange 31 that extends outward the axial portion 19a. The radial flange 31 of the first ring 19 is advantageously provided with a bearing surface 19h coming into contact with the second face 14c of the first connecting portion 14 of the clevis 12. The second front face 19e of the first ring 19 is extended by the radial flange 31. Similarly, the third ring 21 further comprises a radial flange 32 that extends outward the axial portion 21a. The radial flange 32 of the third ring 21 is provided with a bearing surface 21h coming into contact with a second face 15c of the second connecting portion 15 of the clevis 12. The second front face 21e of the third ring 21 is extended by the radial flange 32. In the example depicted, the first front face 19d of the first ring 19 is positioned to bear against the bearing surface 20h of the second ring so that in this second embodiment only the second ring 20 of the contact assembly 17 is in contact with the tang 13. Similarly, the first front face 21d of the third ring 21 is positioned to bear against the bearing surface 22h of the fourth ring so that in this second embodiment only the fourth ring 22 is in contact with the tang 13. In the embodiment shown in figure 4, the front face 20d and the contact surface 20g of the second ring 20 are disposed in contact with the first lateral face 13a of the tang 13. In a variant embodiment, the front face 20d and the contact surface 20g of the second ring 20 may be disposed facing the first lateral face 13a of the tang 13, a slight clearance possibly being present between the first lateral face 13a of the tang 13 and the second ring 20. Similarly, in the embodiment shown in figure 4, the front face 22d and the contact surface 22g of the fourth ring 22 are disposed in contact with the second lateral face 13b of the tang 13. In a variant embodiment, the front face 22d and the contact surface 22g of the fourth ring 22 may be disposed facing the second lateral face 13b of the tang 13, a slight clearance possibly being present between the second lateral face 13b of the tang 13 and the fourth ring 22. The periphery of the radial flange 29 of the second ring 20 and the periphery of the radial flange 30 of the fourth ring 22 may advantageously each comprise a chamfer. The periphery of the radial flange 31 of the first ring 19 and the periphery of the radial flange 32 of the third ring 21 may advantageously also each comprise a chamfer. In accordance with one embodiment, the first, second, third and fourth rings 19, 20, 21 and 22 may constitute a single portion formed by the axial portions 19a, 20a, 21a and 22a, respectively. The material of the tang 13 may advantageously comprise a metal, for example aluminium or an aluminium alloy. The material of the first and second connecting portions 14 and 15 of the clevis 12 may advantageously comprise a thermoplastic or thermoset matrix reinforced with carbon fibres. The carbon fibre reinforcements improving the mechanical properties of the first and second connecting portions 14 and 15 of the clevis 12 may be recycled, for example by pyrolysis or steam-thermolysis, after the fixing assembly 11 is discarded, for some other future use. 5 The material of the first and second contact assemblies 17 and 18 may advantageously comprise a plastic material, a plastic material reinforced with fibres, such as glass fibres, or a metal or an alloy, such as a stainless steel or titanium.

Claims

1. Fixing assembly (11) comprising a clevis pin (16), a clevis (12) provided with first and second connecting portions (14, 15), and a tang (13), the tang (13) and the first and second connecting portions (14, 15) of the clevis (12) being positioned around said clevis pin (16), the tang (13) being disposed on the clevis pin (16) axially between the first and second connecting portions (14, 15) of the clevis (12), characterised in that the fixing assembly (11) further comprises:a first contact assembly (17) disposed radially between the bore (14a) of the first connecting portion (14) of the clevis (12) and the clevis pin (16), the first contact assembly (17) including first and second rings (19, 20) driven one into the other at least in part, the second ring (20) being positioned in the bore (19b) of the first ring (19), at least one of the first and second rings (19, 20) coming to bear axially against a first lateral face (13a) of the tang (13) or facing said first lateral face (13a), anda second contact assembly (18) disposed radially between the bore (15a) of the second connecting portion (15) of the clevis (12) and the clevis pin (16), the second contact assembly (18) including third and fourth rings (21, 22) driven one into the other at least in part, the fourth ring (22) being positioned in the bore (21b) of the third ring (21), at least one of the third and fourth rings (21, 22) coming to bear axially against a second lateral face (13b) of the tang (13) or facing said second lateral face (13b) that is axially opposite the first lateral face (13a) of the tang (13), anda first axial space (23) formed between the first connecting portion (14) of the clevis (12) and the first face (13a) of the tang (13), and- a second axial space (24) formed between the second connecting portion (15) of the clevis (12) and the second face (13b) of the tang (13).

2. Fixing assembly according to claim 1, in which the first ring (19) and / or the second ring (20) comprise(s) at least one axial portion (19a, 20a) provided with a front face (19d, 20d) in contact with the first lateral face (13a) of the tang (13) or facing said first lateral face (13a), andthe third ring (21) and / or the fourth ring (22) comprise(s) at least one axial portion (21a, 22a) provided with a front face (21d, 22d) in contact withthe second lateral face (13b) of the tang (13) or facing said seconu idierai iace (13b).

3. Fixing assembly according to claim 2, in which the first ring (19) comprises a radial flange (25) that extends radially in the first axial space (23), extends outward the axial portion (19a) and is provided with a contact surface (19f) in contact with the first lateral face (13a) of the tang (13) or facing said first lateral face (13a) and extending radially outward the front face (19d) of the axial portion (19a), andthe third ring (21) comprises a radial flange (26) that extends radially in the second radial space (24), extends outward the axial portion (21a) and is provided with a contact surface (21f) in contact with the second lateral face (13b) of the tang (13) or facing said second lateral face (13b) and radially extending outward the front face (21d) of the axial portion (21a).

4. Fixing assembly according to claim 3, in which the radial flange (25) of the first ring (19) comprises a bearing surface (19g) axially opposite the contact surface (19f) and coming axially into contact with a first face (14b) of the first connecting portion (14) of the clevis (12) disposed facing the first lateral face (13a) of the tang (13), andthe radial flange (26) of the third ring (21) comprises a bearing surface (21g) axially opposite the contact surface (21f) and coming axially into contact with a first face (15b) of the second connecting portion (15) of the clevis (12) disposed facing the second lateral face (13b) of the tang (13).

5. Fixing assembly according to any one of claims 2, 3 or 4, in which the second ring (20) comprises a radial flange (27) that extends outward the axial portion (20a), and is provided with a bearing surface (20f) coming into contact with a second face (14c) of the first connecting portion (14) of the clevis (12) opposite a first face (14b) disposed facing the first lateral face (13a) of the tang (13), andthe fourth ring (22) comprises a radial flange (28) that extends outward the axial portion (22a) and is provided with a bearing surface (22f) coming into contact with a second face (15c) of the second connecting portion (15) of the clevis (12) opposite a first face disposed facing the second lateral face (13b) of the tang (13).

6. Fixing assembly according to claim 2, in which the second ring comprises a radial flange (29) that extends radially in the first axial space (23), extends outward the axial portion (20a) and is provided with a contact surface (20g) in contact with the first lateral face (13a) of the tang (13) or facing said first lateral face (13a) and extending radially outward the front face (20d) of the axial portion (20a), andthe fourth ring (22) comprises a radial flange (30) that extends radially in the second radial space (24), extends outward the axial portion (22a) and is provided with a contact surface (22g) in contact with the second lateral face (13b) of the tang (13) or facing said second lateral face (13b) and extending radially outward the front face (22d) of the axial portion (22a).

7. Fixing assembly according to claim 6, in which the radial flange (29) of the second ring (20) comprises a bearing surface (20h) axially opposite the contact surface (20g) and coming axially into contact with a first face (14b) of the first connecting portion (14) of the clevis (12) disposed facing the first lateral face (13a) of the tang (13), andthe radial flange (30) of the fourth ring (22) comprises a bearing surface (22h) axially opposite the contact surface (22g) and coming axially into contact with a first face (15b) of the second connecting portion (15) of the clevis (12) disposed facing the second lateral face (13b) of the tang (13).

8. Fixing assembly according to any one of claims 2, 6 or 7, in which the first ring (19) comprises a radial flange (31) that extends outward the axial portion (19a) and is provided with a bearing surface (19h) coming into contact with a second face (14c) of the first connecting portion (14) of the clevis (12) opposite a first face (14b) disposed facing the first lateral face (13a) of the tang (13), andthe third ring (21) comprises a radial flange (32) that extends outward the axial portion (21a), and is provided with a bearing surface (21h) coming into contact with a second face (15c) of the second connecting portion (15) of the clevis (12) opposite a first face disposed facing the second lateral face (13b) of the tang (13).

9. Fixing assembly according to any one of the preceding claims, in which the material of the first and second connecting portions (14, 15) of theclevis (12) comprises a thermoplastic or thermoset matrix reinforced uy caruun fibres.

10. Fixing assembly according to any one of the preceding claims, in which the tang (13) comprises a metal, such as aluminium or an aluminium 5 alloy.18

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