Fastening assembly including a connecting rod and a tenon
The fastening assembly addresses galvanic corrosion by using radial contact assemblies with axial spaces to prevent direct contact, achieving a cost-effective and recyclable solution for connecting rods and tenons.
Patent Information
- Authority / Receiving Office
- FR · FR
- Patent Type
- Patents
- Current Assignee / Owner
- Filing Date
- 2024-01-31
- Publication Date
- 2026-03-13
AI Technical Summary
Existing fastening assemblies for connecting rods and tenons suffer from galvanic corrosion at the interface, leading to premature wear and increased weight and cost due to the use of glass fiber reinforced plastic layers, which also hinder recycling of carbon fibers.
A fastening assembly design featuring first and second contact assemblies with rings positioned radially between the connecting rod and fixing shaft, creating axial spaces to prevent direct contact and eliminate galvanic corrosion, allowing for a simple, quick, and cost-effective installation without additional fixing means.
The solution effectively prevents galvanic corrosion, reduces manufacturing complexity and cost, and enables recycling of carbon fibers by maintaining the mechanical properties of the connecting rod, while ensuring a durable and lightweight assembly.
Smart Images
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Abstract
Description
Title of the invention: Fastening assembly comprising a connecting rod and a tenon Technical field of the invention
[0001] The present invention relates, in general, to connecting rods and the assembly of a connecting rod yoke and a tenon for fixing a connecting rod and a tenon on a fixing shaft.
[0002] More specifically, the invention relates to a fastening assembly comprising a fastening shaft, a connecting rod provided with two connecting portions, and a tenon. Prior art
[0003] An existing fixing assembly 1, as shown in [Fig.1], includes a connecting rod clevis 2 provided with two connecting portions 3 and 4, and a tenon 5 mounted on a fixing shaft 6 for fixing the connecting rod 2 and the tenon 5 around the fixing axis X.
[0004] The two connecting portions 3 and 4 are generally formed of a carbon fiber reinforced plastic material and the tenon is formed of metal such as aluminium.
[0005] Conventionally, two contact rings 7 and 8 are also interposed radially between the fixing shaft 6 and the connecting portions 3 and 4.
[0006] The proximity and contacts resulting from the fixing of the connecting rod 2 and the tenon 5 lead to the appearance of galvanic corrosion at the interface between the connecting portions 3 and 4 and the tenon 5. However, this phenomenon leads to premature wear of the fixing assembly 1.
[0007] In order to eliminate this risk of galvanic corrosion, it is known to deposit a layer 9, 10 of glass fiber reinforced plastic material, generally in the form of a fold, on the surface of the connecting portions 3 and 4 coming into contact with the tenon 5.
[0008] However, the addition of such a layer 9, 10 on the connecting portions of the connecting rod increases the weight of the fastening assembly 1.
[0009] Given its nature and manufacturing steps, layer 9, 10 makes obtaining the fastening assembly 1 also particularly expensive.
[0010] Furthermore, the presence of glass fibers in layer 9, 10 does not allow the carbon fibers of the carbon fiber reinforced plastic material of the connecting portions 3 and 4 of the connecting rod 2 to be recycled after disposal of the fastening assembly 1. Summary of the invention
[0011] The invention therefore aims to remedy these drawbacks and to offer a simple and quick-to-implement configuration of a fastening assembly including a fixing shaft, a connecting rod and a tenon to eliminate the appearance of galvanic corrosion at the interface between the connecting rod and the tenon.
[0012] A fixing assembly is therefore proposed comprising a fixing shaft, a connecting rod provided with first and second connecting portions and a tenon, the first and second connecting portions of the connecting rod and the tenon being positioned around said fixing shaft, the tenon being disposed on the fixing shaft axially between the first and second connecting portions of the connecting rod.
[0013] In addition, the fastening assembly includes:
[0014] - a first set of contacts interposed radially between the bore of the first connecting portion of the connecting rod and the fixing shaft, the first contact assembly comprising first and second rings fitted at least partially into one another, the second ring being positioned in the bore of the first ring, at least one of the first and second rings bearing axially against a first lateral face of the tenon or opposite said first lateral face, and
[0015] - a second set of contacts interposed radially between the bore of the second connecting portion of the connecting rod and the fixing shaft, the second contact assembly comprising third and fourth rings fitted at least partially into each other, the fourth ring being positioned in the bore of the third ring, at least one of the third and fourth rings bearing axially against a second lateral face of the tenon or opposite said second lateral face which is axially opposed to the first lateral face of the tenon,
[0016] - a first axial space being provided between the first connecting portion of the connecting rod and the first face of the tenon, and
[0017] - a second axial space being provided between the second connecting portion of the connecting rod and the second face of the tenon.
[0018] In one embodiment, the first ring and the second ring can each come axially to bear against the first lateral face of the tenon or opposite said first lateral face, and the third ring and the fourth ring can each come axially to bear against the second lateral face of the tenon or opposite said second lateral face axially opposite the first lateral face of the tenon.
[0019] According to one feature, the first ring and the second ring may comprise at least one axial portion having a front face in contact with the first lateral face of the tenon or opposite said first lateral face,
[0020] and the third ring and the fourth ring may include at least an axial portion having a front face in contact with the second lateral face of the tenon or opposite said second lateral face.
[0021] According to an alternative, only one of the first and second rings may comprise at least an axial portion having a front face in contact with the first lateral face of the tenon or opposite said first lateral face,
[0022] and only one of the third and fourth rings may include at least an axial portion having a front face in contact with the second lateral face of the tenon or opposite said second lateral face.
[0023] In one embodiment, the first ring comprises a radial collar which extends radially in the first axial space, which extends outwards the axial portion and which is provided with a contact surface in contact with the first lateral face of the tenon or opposite said first lateral face and extending radially outwards the front face of the axial portion,
[0024] and the third ring includes a radial collar which extends radially in the second radial space, which extends outwards the axial portion and which is provided with a contact surface in contact with the second lateral face of the tenon or opposite said second lateral face and extending radially outwards the front face of the axial portion.
[0025] Preferably, the radial collar of the first ring comprises a bearing surface axially opposed to the contact surface and coming axially into contact with a first face of the first connecting portion of the connecting rod arranged opposite the first lateral face of the tenon,
[0026] and the radial collar of the third ring includes a bearing surface axially opposed to the contact surface and coming axially into contact with a first face of the second connecting portion of the connecting rod arranged opposite the second lateral face of the tenon.
[0027] Preferably, the second ring further comprises a radial collar which extends outwards from the axial portion, and which is provided with a bearing surface which comes into contact with a second face of the first connecting portion of the connecting rod opposite a first face arranged opposite the first lateral face of the tenon,
[0028] and the fourth ring further comprises a radial collar which extends outwards the axial portion, and which is provided with a bearing surface which comes into contact with a second face of the second connecting portion of the connecting rod opposite a first face arranged opposite the second lateral face of the tenon.
[0029] Advantageously, the periphery of the radial collar of the first ring and the periphery of the radial collar of the third ring can each include a chamfer.
[0030] Alternatively or in combination, the periphery of the radial collar of the second ring and the periphery of the radial collar of the fourth ring may each include a chamfer.
[0031] In another embodiment, the second ring may include a radial collar extending radially into the first axial space, extending outwards from the axial portion and having a contact surface in contact with the first lateral face of the tenon or opposite said first lateral face and extending radially outwards from the front face of the axial portion,
[0032] and the fourth ring may include a radial collar which extends radially in the second radial space, which extends outwards the axial portion and which is provided with a contact surface in contact with the second lateral face of the tenon or opposite said second lateral face and extending radially outwards the front face of the axial portion.
[0033] Preferably, the radial flange of the second ring comprises a bearing surface axially opposed to the contact surface and coming axially into contact with a first face of the first connecting portion of the connecting rod disposed opposite the first lateral face of the tenon, and
[0034] the radial collar of the fourth ring includes a bearing surface axially opposed to the contact surface and coming axially into contact with a first face of the second connecting portion of the connecting rod arranged opposite the second lateral face of the tenon.
[0035] Preferably, the first ring further comprises a radial collar which extends outwards the axial portion, and which is provided with a bearing surface coming into contact with a second face of the first connecting portion of the connecting rod opposite a first face arranged opposite the first lateral face of the tenon,
[0036] and in which the third ring further comprises a radial collar which extends outwards the axial portion, and which is provided with a bearing surface coming into contact with a second face of the second connecting portion of the connecting rod opposite a first face arranged opposite the second lateral face of the tenon.
[0037] Advantageously, the periphery of the radial collar of the second ring and the periphery of the radial collar of the fourth ring can each include a chamfer.
[0038] Alternatively or in combination, the periphery of the radial collar of the first ring and the periphery of the radial collar of the third ring may each include a chamfer.
[0039] Advantageously, the material of the first and second connecting portions of the connecting rod may comprise a thermoplastic or thermosetting matrix reinforced with carbon fibers.
[0040] Advantageously, the tenon may comprise a metallic material, such as aluminium or an aluminium alloy. Brief description of the figures
[0041] Other purposes, advantages and features will become apparent from the following description, given for illustrative purposes only and made with reference to the accompanying drawings on which:
[0042] [Fig-1] is a cross-sectional view of a fastening assembly comprising a connecting rod and a tenon according to the prior art.
[0043] [Fig.2] is a cross-sectional view of a fastening assembly comprising a connecting rod and a tenon according to an embodiment according to the invention.
[0044] [Fig.3] is a cross-sectional view of a fastening assembly comprising a connecting rod and a tenon according to another embodiment according to the invention.
[0045] [Fig.4] is a cross-sectional view of a fastening assembly comprising a connecting rod and a tenon according to another embodiment according to the invention. Detailed description of the invention
[0046] Figure 2 illustrates a fastening assembly 11 according to a first embodiment of the invention. The fastening assembly comprises a connecting rod 12 and a tenon 13.
[0047] The connecting rod 12 includes at least one forked end forming a connecting rod yoke and comprising first and second connecting portions, respectively 14 and 15.
[0048] The first connecting portion 14 comprises a first face 14b and a second face 14c axially opposite to the first face 14b. The thickness of the first connecting portion 14 is delimited by the first and second faces 14b and 14c.
[0049] Similarly, the second connecting portion 15 comprises a first face 15b and a second face 15c axially opposite to the first face 15b. The thickness of the second connecting portion 15 is delimited by the first and second faces 15b and 15c.
[0050] The first and second connecting portions 14 and 15 of the connecting rod 12 and the tenon 13 are positioned around a common fixing shaft 16 of the assembly. The fixing shaft 16 extends along an axis X.
[0051] In addition, the tenon 13 is arranged on the fixing shaft 16 axially between the first and second connecting portions 14 and 15 of the connecting rod 12.
[0052] The tenon 13 comprises a first lateral face 13a and a second lateral face 13b axially opposed to the first lateral face 13a of the tenon 13. The first and second lateral faces 13a and 13b define the thickness of the tenon 13. The tenon 13 also comprises a bore 13c bearing against the outer surface of the fixing axis 16.
[0053] The fastening assembly 11 further includes first and second contact assemblies, respectively 17 and 18.
[0054] The first contact set 17 is interposed radially between the bore 14a of the first connecting portion 14 of the connecting rod 12 and the fixing shaft 16.
[0055] The first contact set 17 comprises a first outer ring 19 and a second inner ring 20 fitted into each other.
[0056] The first ring 19 advantageously comprises an axial portion 19a having a bore 19b, an outer surface 19c radially opposite to the bore 19b, and first and second frontal faces 19d and 19e axially opposite and which delimit the axial length of the axial portion 19a.
[0057] The second ring 20 advantageously comprises an axial portion 20a having a bore 20b, an outer surface 20c radially opposite to the bore 20b, and first and second front faces 20d and 20e axially opposite and delimiting the axial length of the axial portion 20a.
[0058] The second ring 20 is positioned in the bore 19b of the first ring 19 so that the outer surface 20c of the second ring 20 is positioned in contact with the bore 19b of the first ring 19.
[0059] The second contact set 18 is interposed radially between the bore 15a of the second connecting portion 15 of the connecting rod 12 and the fixing shaft 16.
[0060] The second contact set 18 comprises a third outer ring 21 and a fourth inner ring 22 fitted into each other.
[0061] The third ring 21 advantageously comprises an axial portion 21a having a bore 21b, an outer surface 21c radially opposite to the bore 21b, and first and second front faces 21d and 21e axially opposite and which delimit the axial length of the axial portion 21a.
[0062] The fourth ring 22 advantageously comprises an axial portion 22a having a bore 22b, an outer surface 22c radially opposite to the bore 22b, and first and second front faces 22d and 22e axially opposite and delimiting the axial length of the axial portion 22a.
[0063] The fourth ring 22 is positioned in the bore 21b of the third ring 21 so that the outer surface 22c of the fourth ring 22 is positioned in contact with the bore 21b of the third ring 21.
[0064] 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 outer surface of the fixing shaft 16.
[0065] The outer surface 19c of the axial portion 19 of the first ring 19 and the outer surface 21c of the axial portion 21 of the third ring 21 are positioned, respectively, against the bore 14a of the first connecting portion 14 and against the bore 15a of the second connecting portion 15.
[0066] The first and second rings 19 and 20 are fixed to the fixing assembly 11 by press fitting between the first connecting portion 14 of the connecting rod 12 and the fixing shaft 16.
[0067] Similarly, the third and fourth rings 21 and 22 are fixed to the fixing assembly 11 by press fitting between the second connecting portion 15 of the connecting rod 12 and the fixing shaft 16.
[0068] In the example illustrated in [Fig.2], the first ring 19 comes axially to rest against a first lateral face 13a of the tenon 13 and the third ring 21 comes axially to rest against the second lateral face 13b of the tenon 13.
[0069] In addition, a first axial space 23 is provided between the first connecting portion 14 of the connecting rod 12 and the first face 13a of the tenon 13.
[0070] Similarly, a second axial space 24 is provided between the second connecting portion 15 of the connecting rod 12 and the second face 13b of the tenon 13.
[0071] Such a configuration of the fastening assembly 11 makes it possible to eliminate by a simple, quick and inexpensive means the risks of the appearance of galvanic corrosion linked to the contacts between the connecting rod 12 and the tenon 13.
[0072] The contact between the first ring 19 and the tenon 13 and the contact between the second ring 20 and the tenon 13 make it possible to provide, respectively, the first axial space 23 and the second axial space 24 and thus to keep the first and second connecting portions 14, 15 of the connecting rod 12 at a distance from the tenon 13.
[0073] Furthermore, the presence of the first and second axial spaces 23 and 24 between the first and second connecting portions 14, 15 of the connecting rod 12 and the tenon 13 eliminates the need for a smooth surface on the first faces 14b, 15b of the first and second connecting portions 14, 15. The manufacture of the fastening assembly 11 does not require a machining step of the first faces 14b and 15b of the first and second connecting portions 14, 15. As-cast first and second connecting portions 14, 15 can be used.
[0074] The contact assembly 17 is installed by fitting the first and second rings 19 and 20 between the first connecting portion 14 of the connecting rod 12 and the mounting shaft 16, and installing the contact assembly 18 is achieved by fitting the third and fourth rings 21 and 22 into the second connecting portion 15 of the connecting rod 12.
[0075] This press-fit assembly does not require any additional means for fixing the contact assemblies 17 and 18, such as glue. Installation is simple and quick, without requiring, as would be the case for fixing by gluing, any preparation time for the inner surface of the connecting rod 12 and the outer surface of the fixing shaft 16, nor any time for setting, curing, or cleaning.
[0076] In the illustrated example, the first and second rings 19 and 20 come axially to bear against the first lateral face 13a of the tenon 13, and the third and fourth rings 21 and 22 come axially to bear against the second lateral face 13b of the tenon 13.
[0077] 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 tenon 13.
[0078] In addition, 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 tenon 13.
[0079] In the first embodiment illustrated in [Fig.2], the first ring 19 includes a radial collar 25 which extends radially in the first axial space 23.
[0080] The radial collar 25 of the first ring 19 forms a radial portion of the first ring 19, extending outwards the axial portion 19a and extending radially outwards the first front face 19d of the axial portion 19a.
[0081] The radial collar 25 the first ring 19 is provided with a contact surface 19f in contact with the first lateral face 13a of the tenon 13.
[0082] In the illustrated example, the radial collar 25 of the first ring 19 advantageously includes a bearing surface 19g axially opposed to the contact surface 19f and coming axially into contact with the first face 14b of the first connecting portion 14 of the connecting rod 12.
[0083] Similarly, the third ring 21 includes a radial collar 26 which extends radially into the second radial space 24.
[0084] The radial collar 26 forms a radial portion of the third ring 21, extending outwards the axial portion 21a and extending radially outwards the first front face 21d of the axial portion 21a.
[0085] The radial collar 26 of the third ring 21 is provided with a contact surface 21f in contact with the second lateral face 13b of the tenon 13.
[0086] In the illustrated example, the radial flange 26 of the third ring 21 comprises a bearing surface 21g axially opposed to the contact surface 21f and coming axially in contact with the first face 15b of the second connecting portion 15 of the connecting rod 12 arranged opposite the second lateral face 13b of the tenon 13.
[0087] Preferably, the second ring 20 further comprises a radial collar 27 which extends outwards the axial portion 20a, and which is provided with a bearing surface 20f coming into contact with the second face 14c of the first connecting portion 14 of the connecting rod 12.
[0088] The radial collar 27 extends the second front face 20e of the second ring 20.
[0089] Similarly, the fourth ring 22 further includes a radial collar 28 which extends outwards the axial portion 22a, and which is provided with a bearing surface 22f coming into contact with a second face 15c of the second connecting portion 15 of the connecting rod 12.
[0090] The radial collar 28 extends the second front face 22e of the fourth ring 22.
[0091] In the embodiment described in [Fig.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 arranged in contact with the first lateral face 13a of the tenon 13.
[0092] In one embodiment, the front face 19d, the contact surface 19f of the first ring 19 and the front face 20d of the second ring 20 can be arranged opposite the first lateral face 13a of the tenon 13, a slight play being present between the first lateral face 13a of the tenon 13 and the first and second rings 19, 20.
[0093] Similarly, in the embodiment described in [Fig.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 arranged in contact with the second lateral face 13b of the tenon 13.
[0094] In one embodiment, the front face 21d, the contact surface 21f of the third ring 21 and the front face 22d of the fourth ring 22 can be arranged opposite the second lateral face 13b of the tenon 13, a slight play being present between the second lateral face 13b of the tenon 13 and the third and fourth rings 21, 22.
[0095] As illustrated in [Fig.3], on which the elements identical to the first embodiment illustrated in [Fig.2] bear the same references, the periphery of the radial collar 25 of the first ring 19 and the periphery of the radial collar 26 of the third ring 21 can each include a chamfer, respectively 33 and 34.
[0096] Advantageously, the periphery of the radial collar 27 of the second ring and the periphery of the radial collar 28 of the fourth ring can also each include a chamfer.
[0097] Fig. 4 illustrates a second embodiment of a fastening assembly 11 in which the elements identical to the first embodiment illustrated in Fig. 2 bear the same references.
[0098] In the illustrated example, the second ring 20 includes a radial collar 29 which extends radially into the first axial space 23.
[0099] The radial collar 29 of the second ring 20 extends outwards the axial portion 20a and is provided with a contact surface 20g in contact with the first lateral face 13a of the tenon 13 and extending radially outwards the first front face 20d of the axial portion 20a.
[0100] Preferably, the radial collar 29 of the second ring 20 includes a bearing surface 20h axially opposed to the contact surface 20g and coming axially into contact with the first face 14b of the first connecting portion 14 of the connecting rod 12.
[0101] Similarly, the fourth ring 22 includes a radial collar 30 which extends radially into the second radial space 24.
[0102] The radial collar 30 extends outwards the axial portion 22a and is provided with a contact surface 22g in contact with the second lateral face 13b of the tenon 13 and extending radially outwards the first frontal face 22d of the axial portion 22a.
[0103] Preferably, the radial collar 30 of the fourth ring 22 includes a bearing surface 22h axially opposed to the contact surface 22g and coming axially into contact with a first face 15b of the second connecting portion 15 of the connecting rod 12.
[0104] Preferably, the first ring 19 further comprises a radial collar 31 which extends outwards the axial portion 19a.
[0105] The radial collar 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 connecting rod 12.
[0106] The radial collar 31 extends the second front face 19e of the first ring 19.
[0107] Similarly, the third ring 21 further comprises a radial collar 32 which extends outwards the axial portion 21a.
[0108] The radial collar 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 connecting rod 12.
[0109] The radial collar 32 extends the second front face 21e of the third ring 21.
[0110] In the illustrated example, the first front face 19d of the first ring 19 is positioned in contact with 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 tenon 13.
[0111] 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 tenon 13.
[0112] In the embodiment described in [Fig.4], the front face 20d and the contact surface 20g of the second ring 20 are arranged in contact with the first lateral face 13a of the tenon 13.
[0113] In one embodiment, the front face 20d and the contact surface 20g of the second ring 20 can be arranged opposite the first lateral face 13a of the tenon 13, a slight play being present between the first lateral face 13a of the tenon 13 and the second ring 20.
[0114] Similarly, in the embodiment described in [Fig.4], the front face 22d and the contact surface 22g of the fourth ring 22 are arranged in contact with the second lateral face 13b of the tenon 13.
[0115] In one embodiment, the front face 22d and the contact surface 22g of the fourth ring 22 can be arranged opposite the second lateral face 13b of the tenon 13, a slight play being present between the second lateral face 13b of the tenon 13 and the fourth ring 22.
[0116] Advantageously, the periphery of the radial collar 29 of the second ring 20 and the periphery of the radial collar 30 of the fourth ring 22 can each include a chamfer.
[0117] Advantageously, the periphery of the radial collar 31 of the first ring 19 and the periphery of the radial collar 32 of the third ring 21 can also each include a chamfer.
[0118] According to one embodiment, the first, second, third and fourth rings 19, 20, 21 and 22 can be made up of a single portion respectively formed by the axial portions, respectively 19a, 20a, 21a and 22a.
[0119] Advantageously, the material of the tenon 13 may include a metallic material, for example aluminium or an aluminium alloy.
[0120] Advantageously, the material of the first and second connecting portions 14 and 15 of the connecting rod 12 may comprise a thermoplastic or thermosetting matrix reinforced with carbon fibers.
[0121] The carbon fiber reinforcements improving the mechanical properties of the first and second connecting portions 14 and 15 of the connecting rod 12 can be recycled, for example by pyrolysis or vapo-thermolysis, after disposal of the fastening assembly 11, for other future use.
[0122] Advantageously, the material of the first and second contact sets 17 and 18 may comprise a plastic material, a fiber-reinforced plastic material, such as glass fibers, or a metal or alloy, such as stainless steel or titanium.
Claims
1. Demands A fastening assembly (11) comprising a fastening shaft (16), a connecting rod (12) having first and second connecting portions (14, 15) and a tenon (13), the first and second connecting portions (14, 15) of the connecting rod (12) and the tenon (12) being positioned around said fastening shaft (16), the tenon (13) being disposed on the fastening shaft (16) axially between the first and second connecting portions (14, 15) of the connecting rod (12), the thickness of the tenon (13) being delimited by first and second lateral faces (13a, 13b) axially opposed, the thickness of the first connecting portion (14) being delimited by first and second faces (14b, 14c) axially opposed, and the thickness of the second connecting portion (15) being delimited by first and second faces (15b, 15c) axially opposed, characterized in that the fastening assembly (11) further comprises: - a first contact assembly (17) interposed radially between the bore (14a) of the first connecting portion (14) of the connecting rod (12) and the mounting shaft (16), the first contact assembly (17) comprising first and second rings (19, 20) fitted into one another at least partially, the second ring (20) being positioned in the bore (19b) of the first ring (19), the first and second rings (19, 20) bearing axially against the first lateral face (13a) of the tenon (13) or opposite said first lateral face (13a), the first ring (19) and the second ring (20) comprising at least one axial portion (19a, 20a) having a front face (19d, 20d) in contact with the first lateral face (13a) of the tenon (13) or opposite said first lateral face (13a), - a second contact assembly (18) interposed radially between the bore (15a) of the second connecting portion (15) of the connecting rod (12) and the fixing shaft (16), the second contact assembly (18) comprising third and fourth rings (21, 22) fitted into each other at least partially, the fourth ring (22) being positioned in the bore (21b) of the third ring (21), the third and fourth rings (21, 22) bearing axially against the second lateral face (13b) of the tenon (13) or opposite said second lateral face (13b) which is axially opposed to the first lateral face (13a) of the tenon (13), the third ring (21) and the fourth ring (22) comprising at least one axial portion (21a, 22a) having a front face (21d, 22d) in contact with the second lateral face (13b) of the tenon (13) or opposite said second lateral face (13b), - a first axial space (23) being provided between the first connecting portion (14) of the connecting rod (12) and the first face (13a) of the tenon (13), and - a second axial space (24) being provided between the second connecting portion (15) of the connecting rod (12) and the second face (13b) of the tenon (13), - the first ring (19) comprising a radial collar (25) which extends radially into the first axial space (23),extending outwards the axial portion (19a) and having a contact surface (19f) in contact with the first lateral face (13a) of the tenon (13) or opposite said first lateral face (13a) and extending radially outwards the front face (19d) of the axial portion (19a), and - the third ring (21) comprising a radial collar (26) which extends radially into the second radial space (24), extending outwards the axial portion (21a) and having a contact surface (21f) in contact with the second lateral face (13b) of the tenon (13) or opposite said second lateral face (13b) and extending radially outwards the front face (21d) of the axial portion (21a).
2. Fastening assembly according to claim 1, wherein the radial flange (25) of the first ring (19) comprises a bearing surface (19g) axially opposed to the contact surface (19f) and axially in contact with the first face (14b) of the first connecting portion (14) of the connecting rod (12) arranged opposite the first lateral face (13a) of the tenon (13), and the radial flange (26) of the third ring (21) comprises a bearing surface (21g) axially opposed to the contact surface (21f) and axially in contact with the first face (15b) of the second connecting portion (15) of the connecting rod (12) arranged opposite the second lateral face (13b) of the tenon (13).
3. A fastening assembly according to any one of claims 1 or 2, wherein the second ring (20) comprises a radial collar (27) extending outwards from the axial portion (20a), and which is provided with a bearing surface (20f) coming into contact with the second face (14c) of the first connecting portion (14) of the connecting rod (12) opposite the first face (14b) arranged opposite the first lateral face (13a) of the tenon (13), and wherein the fourth ring (22) comprises a radial collar (28) extending outwards from the axial portion (22a), and which is provided with a bearing surface (22f) coming into contact with the second face (15c) of the second connecting portion (15) of the connecting rod (12) opposite the first face arranged opposite the second lateral face (13b) of the tenon (13).
4. Fastening assembly according to any one of the preceding claims, wherein the material of the first and second connecting portions (14, 15) of the connecting rod (12) comprises a thermoplastic or thermosetting matrix reinforced with carbon fibers.
5. Fastening assembly according to any one of the preceding claims, wherein the tenon (13) comprises a metallic material, such as aluminum or an aluminum alloy.