VIBRATION DAMPING MOUNT AND VEHICLE WITH SUCH A VIBRATION DAMPER

Description

Technical field

[0001] This description relates to anti-vibration mounts and to vehicles having such anti-vibration mounts. Prior art

[0002] Document WO2008152284A1 describes an example of such an anti-vibration device.

[0003] Furthermore, document EP0351738A2, according to its abstract, relates to an annular elastic body made of fibrous composite material for supporting vibrations of drive assemblies and comprising at least one wound body having a circumferential direction and a loading direction. The at least one wound body comprises a plurality of wound concentric layers formed of synthetic resin-impregnated fibers extending in the circumferential direction and transversely to the loading direction, and at least one layer of fibers extending at an angle to the concentric layers. Force-inducing fastening elements are arranged on two opposite sides of the at least one wound body. The fastening elements are formed of metal supports at least partly surrounding the at least one wound body and of layers of elastic rubber supporting the metal supports against the at least one wound body. Summary

[0004] The present description aims in particular to propose an anti-vibration support allowing effective filtering of high vibration frequencies, in particular for the support of electric motors of vehicles or mixed engine blocks of vehicles comprising an internal combustion engine and an electric motor.

[0005] For this purpose, the present description proposes an anti-vibration support according to claim 1.

[0006] These provisions ensure effective filtering of high-frequency vibrations.

[0007] In particular, the appearance of natural modes of the anti-vibration support in the 200 - 3000 Hz range is avoided, or at least they are significantly attenuated, unlike anti-vibration supports whose elasticity and damping are both ensured by an elastomer body. This effect is achieved without the need to add swing masses as is the case with elastomer bodies, resulting in a significant weight saving.

[0008] In various embodiments of the anti-vibration support, one and / or the other of the following arrangements (alone or in all their mutual combinations) may optionally be used: said damping material has a damping factor greater than 10% in a temperature range from -30°C to 90°C and in a frequency range of said vibratory movements from 200 Hz to 3000 Hz; said elastic material has a damping factor less than 7% in said temperature range from -30°C to 90°C and in said frequency range of said vibratory movements from 200 Hz to 3000 Hz; said elastic material has a Young's modulus greater than 5 GPa; said elastic material is selected from: a metallic material having a Young's modulus greater than 100 GPa and a damping factor less than 0.2% in said temperature range from -30°C to 90°C and in said frequency range of said vibratory movements from 200 Hz to 3000 Hz;a thermoplastic material having a Young's modulus greater than 5 GPa and a damping factor less than 7% in said temperature range from -30°C to 90°C and in said frequency range of said vibratory movements from 200 to 3000 Hz; a composite material comprising fibers embedded in a synthetic resin matrix, said composite material having a Young's modulus greater than 70 GPa and a damping factor less than 1% in said temperature range from -30°C to 90°C and in said frequency range of said vibratory movements from 200 Hz to 3000 Hz; said suspension allows relative vibratory movements of the first frame with respect to the second frame also in a second vibration direction perpendicular to the first vibration direction; the damping material is at least partially overmolded on said elastic portion;the overmolded damping material has a thickness covering said elastic portion, said thickness (e) being less than L / 15, where L is a length of said elastic portion between said first end and said second end (the thickness in question may for example be of the order of 1.5 to 3 mm); the damping material is also overmolded on at least part of the first frame and / or the second frame;said elastic portion comprises a first section where the damping material overmolding said elastic portion is integral with the first frame, a second section where the damping material overmolding said elastic portion is free and a third section where the damping material overmolding said elastic portion is integral with the second frame, the overmolded damping material having a thickness (e) covering said second section of the elastic portion, said thickness (e) being less than L / 30, where L is a length of said elastic portion between said first end and said second end; the first end of the elastic portion is integral with a first anchor fixed to the first frame and the second end of the elastic portion is integral with a second anchor fixed to the second frame;the first armature extends parallel to a central axis perpendicular to the first vibration direction, the first armature comprising external grooves parallel to the central axis, the second armature is annular and surrounds said first armature and said central axis, the second armature comprising internal grooves parallel to the central axis, the first anchor is fitted into the external grooves of the first armature, and the second anchor is fitted into the internal grooves of the second armature; said elastic portion is made of said elastic material; said elastic portion comprises two parallel elastic blades made of said elastic material, separated by a layer of said damping material which adheres to the two elastic blades;said layer of said damping material has a thickness less than L / 30, where L is a length of said elastic portion between said first end and said second end (the thickness in question may for example be of the order of 1.5 to 3 mm); said elastic portion is deformable in flexion when the second frame moves relative to the first frame at least in the first direction of vibration; the second element is a vehicle power unit; ;

[0009] Furthermore, the present description also relates to a vehicle comprising a body, a power unit and at least one anti-vibration support as defined above connecting the body to the power unit.

[0010] The power unit may include at least one electric motor.

[0011] Finally, the present description also relates to a method for manufacturing an anti-vibration support as defined above, the suspension of which comprises at least one composite part comprising a thermoplastic or thermosetting matrix reinforced with fibers, said fibers being wound between return elements and placed under tension, said method comprising the production of a structure of fibers, pre-impregnated or not, through the following operations: aligning and juxtaposing the fibers, while stretching them between return elements, and keeping them spaced apart from each other, so as to obtain a first layer, superimposing on said first layer, a second layer obtained in an identical manner to the first, where the fibers are parallel to those of the first layer, and kept spaced apart from said fibers of the first layer, repeating the superposition operation until the desired thickness is obtained. Brief description of the drawings

[0012] Other characteristics and advantages of the anti-vibration support will appear during the following description of two of its embodiments, given as non-limiting examples, with reference to the attached drawings.

[0013] On the drawings: [ Fig. 1 ] There figure 1 is a schematic diagram showing a vehicle whose power unit can be supported in particular by one or more anti-vibration supports according to the present description. Fig. 2 ] There figure 2 is a perspective view of a vehicle powertrain connected to the vehicle body by anti-vibration mounts according to the present description. Fig. 3 ] There figure 3 is a perspective view of an anti-vibration support according to a first embodiment. Fig. 4 ] There figure 4 is a view similar to the figure 3 , rear view. [ Fig. 5 ] There Figure 5 is a view similar to the figure 4, partially exploded. [ Fig. 6 ] There figure 6 is a cross-sectional view of the anti-vibration support of the figure 3 . [ Fig. 7 ] There figure 7 is a perspective view of the anti-vibration support of the figure 3 , without the overmolded cushioning material. [ Fig. 8 ] There figure 8 is a perspective view similar to the figure 3 , in a second embodiment. [ Fig. 9 ] There figure 9 is a view similar to the figure 8 , rear view. [ Fig. 10 ] There figure 10 is a front view of the anti-vibration support of the figure 8 . [ Fig. 11 ] There figure 11 is a front view of the anti-vibration support, locally cut away, in a third embodiment. Fig. 12 ] There figure 12 is a perspective view of the anti-vibration support of the figure 11 , without the overmolded cushioning material. [ Fig. 13 ] There figure 13 is a view similar to the figure 12 , view in the opposite direction. [ Fig. 14 ] There figure 14 is an exploded view of the anti-vibration support of the figure 11 , without the overmolded cushioning material. [ Fig. 15 ] There figure 15 is a cross-sectional and perspective view of an anti-vibration support according to a fourth embodiment. More detailed description

[0014] In the various figures, the same references designate identical or similar elements.

[0015] There figure 1 shows very schematically a vehicle V, in particular a motor vehicle, comprising a body CV (or a chassis) and a power unit M connected to the body CV by one or more anti-vibration supports 1, at least one of which corresponds to the present description.

[0016] The power unit M may in particular be an electric motor unit, or where appropriate a hybrid motor unit comprising an internal combustion engine and an electric motor used for the propulsion of the vehicle. In both cases, the operation of the electric motor generates relatively high frequency vibrations, typically above 600 Hz or more generally in the range of 200 Hz to 3000 Hz.

[0017] As shown in the figure 2 , the anti-vibration support(s) 1 may be in the form of a sleeve centered on an axis X, for example substantially horizontal. Each anti-vibration support 1 in the form of a sleeve may be fitted into a housing 1a secured to the CV body.

[0018] In general, the present description proposes an anti-vibration support 1 adapted to filter and dampen vibrations between a first element and a second element (for example one consisting of the power unit M and the other of the body CV of the vehicle) mainly in a first vibration direction Z, said anti-vibration support 1 comprising: a first frame 2 (for example metallic, or other) adapted to be fixed to the first element, a second frame 3 (for example molded in synthetic resin, or other) adapted to be fixed to the second element, a suspension 4 connecting the first frame to the second frame.

[0019] The first frame 2 extends parallel to the central axis X while the second frame 3 is annular and surrounds said first frame 2 and said central axis X, the second frame 3 being able for example to be fitted into the housing 1a described previously.

[0020] The suspension 4 is adapted to allow and dampen relative vibratory movements between the second frame 3 and the first frame 2 at least along the first vibration direction Z.

[0021] The suspension 4 is adapted to support a load, for example the weight of the second element (for example the power unit M) and / or an engine torque recovery load in the first vibration direction Z. The direction Z may be vertical as in the example shown, but it may be oriented differently. For example, the direction Z may possibly be horizontal when the load supported by the suspension 4 is an engine torque recovery load.

[0022] The suspension 4 can also be adapted to allow and dampen relative vibratory movements between the second frame 3 and the first frame 2 according to a second vibration direction Y perpendicular to the axis X and to the first vibration direction Z.

[0023] According to the present description, the suspension 4 is a composite assembly comprising an elastic material associated with a damping material. Said elastic material is a non-damping or weakly damping material, which determines a static stiffness of the suspension, said elastic material being adapted to support the aforementioned load.

[0024] The damping material is suitable for damping the natural modes potentially excited by said vibratory movements.

[0025] The damping material may be a viscoelastic material such as an elastomer. For example, the damping material may be a silicone-based elastomer, in particular the material marketed by Hutchinson under the brand Delta One ®< , or a rubber-based elastomer, in particular the material marketed by Hutchinson under the brand Deltane ®< .

[0026] The damping material may have a damping factor (delta tangent) greater than 10% in a temperature range of -30°C to 90°C and in a frequency range of said vibratory movements of 200 Hz to 3000 Hz.

[0027] The elastic material may have a damping factor of less than 7% in said temperature range of -30°C to 90°C and in said frequency range of said vibratory movements of 200 Hz to 3000 Hz. Said elastic material may have a Young's modulus of greater than 5 GPa. The Young's modulus values ​​given in the present description are measured at an ambient temperature of 20°C and with zero or substantially zero humidity.

[0028] According to a first example, the elastic material may be a metallic material (in particular a steel) having a Young's modulus greater than 100 GPa, and a damping factor less than 0.2% in said temperature range of - 30°C to 90°C and in said frequency range of said vibratory movements of 200 Hz to 3000 Hz.

[0029] According to a second example, the elastic material may be a thermoplastic material (in particular PA6, PA6 / 6 or other) having a Young's modulus greater than 5 GPa, and a damping factor less than 7% in said temperature range of -30°C to 90°C and in said frequency range of said vibratory movements of 200 to 3000 Hz. The thermoplastic material may comprise a filler, for example consisting of short fibers of glass, carbon or basalt.

[0030] According to a third example, the elastic material may be a composite material comprising fibers (in particular continuous fibers, in particular glass, carbon or basalt fibers) embedded in a synthetic resin matrix, said composite material having a Young's modulus greater than 70 GPa, and a damping factor less than 1% in said temperature range of -30°C to 90°C and in said frequency range of said vibratory movements of 200 Hz to 3000 Hz. The synthetic resin matrix may be a thermoplastic material (in particular PA6, PA6 / 6 or other) or a thermosetting material (in particular epoxy or other)

[0031] The suspension has a dynamic stiffness of between 400 N / mm and 800 N / mm (measured under constant acceleration applied to the first frame, for example 3 g) with respect to said vibratory movements in the first vibration direction, in a frequency range of said vibratory movements from 200 Hz to 3000 Hz.

[0032] This result is obtained because the anti-vibration support 1 has a relatively small mass of damping material (less than 20% of the total mass of the anti-vibration support 1), since the damping material is not or almost not used to obtain the desired static stiffness of the anti-vibration support, this function being provided by the elastic material. As a result, the natural modes of the suspension 4 are eliminated or greatly reduced in the entire 200 Hz - 3000 Hz range. This ensures effective filtering of high-frequency vibrations.

[0033] In the various embodiments described below with reference to the Figures 3-15 , the suspension comprises several suspension members 5; 15, having at least one elastic portion 6; 16; 26 comprising said elastic material, said elastic portion extending between a first end connected to the first frame and a second end connected to the second frame. The suspension members 5; 15 are angularly distributed around the central axis X. Said elastic portion 6; 16; 26 is deformable in flexion when the first frame moves relative to the second frame at least in the first vibration direction Z and / or in the second vibration direction Y. First form of realization

[0034] In the first embodiment, shown in the figures 3 to 7, the anti-vibration support comprises for example two suspension members 5 arranged substantially at 180 degrees from each other around the central axis X, or possibly more than two suspension members 5. The elastic portion 6 of each suspension member 5 can be arranged so as to extend substantially in a spiral between the first end 6a and the second end 6b of said elastic portion, said elastic portion 6 having a width / parallel to the central axis X.

[0035] In the first embodiment, each suspension member 5 may comprise, for example, a single elastic portion 6 and each elastic portion 6 may, for example, be entirely made of said elastic material, and may be in the form of an elastic tongue or blade.

[0036] The first end 6a of the elastic portion 6 may comprise a first anchor 6a1 fixed to the first frame 2 and the second end 6b of the elastic portion 6 may comprise a second anchor 6b1 fixed to the second frame 3. The anchors 6a1, 6b1 may for example be edges of the elastic portion 6, making an angle for example of the order of 90 degrees with the rest of the elastic portion 6.

[0037] The first frame 2 may comprise, for example, L-shaped grooves open radially outwards and extending parallel to the central axis X, in which the anchors 6a1 of the elastic portions 6 can slide respectively, by fitting parallel to the axis X. The second frame 3 may comprise internal grooves 3b parallel to the central axis X in which the anchors 6b1 of the elastic portions 6 can slide respectively, by fitting parallel to the axis X. In the example shown, the grooves 3b may be made in internal ribs 3a of the second frame 3, each internal rib 3a having a hook-shaped section which internally delimits the groove 3b, which opens out in the vicinity of the internal cylindrical surface of the second frame 3.

[0038] The damping material 7 may be overmolded onto each elastic portion 6. The damping material 7 may optionally also be overmolded onto at least a portion of the first frame 2 and / or the second frame 3, in particular on the radially external face of the first frame 2 and / or on the radially internal face of the second frame 3.

[0039] The overmolded damping material 7 may have a thickness e covering said elastic portion 6, said thickness e being less than L / 15, where L is the length of said elastic portion 6 between said first end 6a and said second end 6b.

[0040] In the example shown, the elastic portion 6 comprises a first section 6c where the damping material 7 overmolding said elastic portion 6 is integral with the first frame 2, a second section 6d where the damping material 7 overmolding said elastic portion 6 is free and a third section 6e where the damping material 7 overmolding said elastic portion 6 is integral with the second frame 3. The thickness e of the damping material 7 covering said second section 6d of the elastic portion 6 may be less than L / 30.

[0041] The thickness e can for example be of the order of 1.5 to 3 mm.

[0042] The anti-vibration support 1 may further comprise a limiting member 8 for limiting the movements in the first vibration direction Z. The limiting member 8 may for example comprise a ring 8a fitted onto one end of the first frame 2 and an external elastomer lining 8b, comprising for example bosses 8c adapted to abut against the internal surface of the second frame 3. Second embodiment

[0043] In the second embodiment, shown in the figures 8 to 10, the elastic portions 26 may be of a spiral shape similar to the first embodiment. The elastic portions 26 may for example be 4 in number, arranged for example at 90 degrees from each other around the central axis X. The elastic portions 26 may optionally be arranged in pairs of diametrically opposed elastic members, the elastic portions 26 of one pair being oriented so that their spiral shape extends in an angular direction from the first end 26a to the second end 26b, while the elastic portions 26 of the other pair are oriented so that their spiral shape extends in the opposite angular direction from the first end 26a to the second end 26b.

[0044] The fixing of the first and second ends 26a, 26b of each elastic portion 26 respectively to the first and second frames 2, 3 can be carried out for example as in the first embodiment, with anchors 26a1, 26b1 fitted respectively in grooves 2a, 3b of the first and second frames 2, 3.

[0045] In this third embodiment, the elastic portions 26 may each comprise two parallel elastic blades 27 made of said elastic material, separated by a layer of said damping material 7 which adheres to the two elastic blades 27.

[0046] More generally, there could be a number N of elastic blades 27 separated respectively by a number N-1 of layers of damping material 7, N being an integer at least equal to 2.

[0047] Said layer of said damping material 7 may have a thickness e1 less than L / 30, where L is the length of said elastic portion 26 between said first end 26a and said second end 26b. The thickness e& may for example be between 1.5 and 3 mm.

[0048] This sandwich structure of the elastic portion is possible for all forms of the suspension 4.

[0049] In this second embodiment, the elastic portions 26 do not necessarily need to be overmolded with damping material 7, although this possibility is not excluded.

[0050] The anti-vibration support 1 may comprise a limiting member 8 as in the first embodiment. More generally, everything that has been described for the first embodiment and which is not contradicted by the above, is applicable to the second embodiment.

[0051] In this second embodiment, the anti-vibration support can be particularly light. In particular, the mass of damping material 7 can be reduced, since this material works in shear very effectively for damping. The mass of damping material 7 can be, for example, less than 5% of the total mass of the anti-vibration support 1. Third embodiment

[0052] In the third embodiment, shown in the figures 11 to 14 , the anti-vibration support comprises for example 4 suspension members 15 arranged substantially at 90 degrees to each other around the central axis X, or possibly a different number of suspension members 15.

[0053] Each suspension member 15 may comprise a pair of elastic portions 16 in the form of elastic tongues or blades, each formed entirely of elastic material. The first ends 16a of the two elastic portions 16 of each suspension member 15 are integral with each other and the second ends 16b of the two elastic portions 16 are integral with each other. The width l of each elastic portion 16 is parallel to the central axis X and the two elastic portions 16 are curved away from each other between the first and second ends, so as to work in flexion.

[0054] The first end 16a of the pair of elastic portions 16 may comprise a first anchor 16a1 fixed to the first frame 2 and the second end 16b of the pair of elastic portions 16 may comprise a second anchor 16b1 fixed to the second frame 3.

[0055] In the example shown, the anchors 16a1, 16b1 may comprise portions of cylindrical walls centered on the axis X, which slide by fitting along the axis X into complementary grooves 12a, 13b formed respectively in the outer surface of the first reinforcement 2 and in the inner surface of the second reinforcement 3. In the example shown, the anchor 16a1 is a T-shaped rib received in a T-shaped groove 12a of the first reinforcement 2, and the anchor 16b1 comprises lateral edges 16b2 which engage in the grooves 13b, which may be formed in ribs 13a projecting towards the inside of the second reinforcement 3, in a similar manner to the first embodiment.

[0056] The damping material 7 may be overmolded onto each elastic portion 16. The damping material 7 may optionally also be overmolded onto at least a portion of the first frame 2 and / or the second frame 3, in particular on the radially external face of the first frame 2 and / or on the radially internal face of the second frame 3.

[0057] The overmolded damping material 7 may have a thickness e covering said elastic portion 16, said thickness e being less than L / 15, where L is the length of said elastic portion 6 between said first end and said second end.

[0058] In the example shown, each elastic portion 16 comprises a first section 16c where the damping material 7 overmolding said elastic portion 16 is integral with the first frame 2, a second section 16d where the damping material 7 overmolding said elastic portion 16 is free and a third section 16e where the damping material 7 overmolding said elastic portion 6 is integral with the second frame 3. The thickness e of the damping material 7 covering said second section 16d of the elastic portion may be less than L / 30.

[0059] The thickness e can for example be between 1.5 and 3 mm.

[0060] The anti-vibration support 1 may further comprise a limiting member 8 similar to that of the first embodiment. Fourth embodiment

[0061] The fourth embodiment is similar to the third embodiment and will therefore not be described again here. It differs from the third embodiment in that: each suspension member 15 comprises a single elastic portion 16; the second anchor 13b1 is T-shaped and the groove 3b is also T-shaped. Manufacturing methods

[0062] All or part of the suspension 4 of the anti-vibration support 1 can for example be obtained by 3D printing (or more generally by additive manufacturing).

[0063] Another known manufacturing method is described in document WO2019234625A1.

[0064] In this case, the suspension 4 may comprise at least one composite part comprising a thermoplastic or thermosetting matrix reinforced with fibres, said fibres being wound between return elements and tensioned, this composite part being manufactured by a method comprising the production of a structure of fibres, pre-impregnated or not, through the following operations: align and juxtapose the fibers, while stretching them between return elements, and keeping them spaced apart from each other, so as to obtain a first layer, superimpose on said first layer, a second layer obtained in a manner identical to the first, where the fibers are parallel to those of the first layer, and kept apart from it, repeat the superposition operation until the desired thickness is obtained.

Claims

1. Anti-vibration support (1) designed to filter and dampen vibrations between a first element (M) and a second element (CV), said anti-vibration support (1) including: - a first reinforcement (2) designed to be attached to the first element (M), the first reinforcement (2) extending parallel to a central axis (X), - a second reinforcement (3) designed to be attached to the second element (CV), the second reinforcement (3) being annular and surrounding said first reinforcement (2) and said central axis (X), - a suspension (4) connecting the first reinforcement (2) to the second reinforcement (3), said suspension (4) being a composite assembly including an elastic material associated with a damping material (7), said suspension (4) allowing relative vibratory movements of the first reinforcement (2) relative to the second reinforcement (3) at least in a first vibration direction (Z) perpendicular to the central axis (X), wherein said elastic material is a non-damping or slightly damping material and determines a static stiffness of the suspension, wherein the damping material (7) is designed to dampen normal modes potentially excited by said vibratory movements, wherein the suspension (4) has a dynamic stiffness of between 400 N / mm and 800 N / mm with respect to said vibratory movements in the first vibration direction (Z), in a frequency range of said vibratory movements of 200 Hz to 3000 Hz, wherein said damping material (7) has a mass of less than 20% of a total mass of the anti-vibration support (1), wherein the suspension (4) includes a plurality of suspension members (5; 15) angularly distributed about the central axis (X), each suspension member (5; 15) having at least one elastic portion (6; 26; 16) including said elastic material and having a width ( / ) parallel to the central axis (X), said elastic portion (6; 26; 16) extending between a first end (6a; 26a; 16a) connected to the first reinforcement (2) and a second end (6b; 26b; 16b) connected to the second reinforcement (3), and wherein each suspension member (5; 15) includes: A - either a single tongue-shaped elastic portion (6; 26) and the elastic portion (6; 26) of each suspension member being arranged so as to extend substantially in a spiral between the first end (6a; 26a) and the second end (6b; 26b) of said elastic portion (6; 26), B - or a single tongue-shaped elastic portion (16) and the elastic portion (16) of each suspension member being curved between the first and second ends (16a, 16b), C - or two tongue-shaped elastic portions (16), the first ends (16a) of the two elastic portions being integral with one another and the second ends (16b) of the two elastic portions being integral with one another, the two elastic portions (16) being curved away from each another between the first and second ends (16a, 16b).

2. Anti-vibration support (1) according to Claim 1, wherein said damping material (7) has a damping factor greater than 10% in a temperature range of -30°C to 90°C and in a frequency range of said vibratory movements of 200 Hz to 3000 Hz.

3. Anti-vibration support (1) according to any one of the preceding claims, wherein said elastic material has a damping factor of less than 7% in said temperature range of -30°C to 90°C and in said frequency range of said vibratory movements of 200 Hz to 3000 Hz.

4. Anti-vibration support (1) according to any one of the preceding claims, wherein said elastic material has a Young's modulus higher than 5 GPa.

5. Anti-vibration support (1) according to any one of the preceding claims, wherein said elastic material is selected from: - a metallic material having a Young's modulus higher than 100 GPa and a damping factor lower than 0.2% in said temperature range of -30°C to 90°C and in said frequency range of said vibratory movements of 200 Hz to 3,000 Hz; - a thermoplastic material having a Young's modulus higher than 5 GPa and a damping factor lower than 7% in said temperature range of -30°C to 90°C and in said frequency range of said vibratory movements of 200 to 3,000 Hz; - a composite material comprising fibres embedded in a synthetic resin matrix, said composite material having a Young's modulus higher than 70 GPa and a damping factor lower than 1% in said temperature range of -30°C to 90°C and in said frequency range of said vibratory movements of 200 Hz to 3,000 Hz.

6. Anti-vibration support (1) according to any one of the preceding claims, wherein the damping material (7) is at least partially overmoulded over said elastic portion.

7. Anti-vibration support (1) according to Claim 6, wherein the overmoulded damping material (7) has a thickness (e) covering said elastic portion (6; 16), said thickness (e) being smaller than L / 15, where L is a length of said elastic portion (6; 16) between said first end (6a; 16a) and said second end (6b; 16b).

8. Anti-vibration support (1) according to Claim 6 or Claim 7, wherein the damping material (7) is also overmoulded over at least part of the first reinforcement (2) and / or of the second reinforcement (3).

9. Anti-vibration support (1) according to Claim 8, wherein said elastic portion (6; 16) comprises a first section (6c; 16c) where the damping material (7) overmoulding said elastic portion is secured to the first reinforcement (2), a second section (6d; 16d) where the damping material overmoulding said elastic portion is free and a third section (6e; 16e) where the damping material overmoulding said elastic portion is secured to the second reinforcement (3), the overmoulded damping material (7) having a thickness (e) covering said second section (6d; 16d) of the elastic portion, said thickness (e) being smaller than L / 30, where L is a length of said elastic portion (6; 16) between said first end (6a; 16a) and said second end (6b; 16b).

10. Anti-vibration support (1) according to any one of the preceding claims, wherein said elastic portion (6; 16) is made of said elastic material.

11. Anti-vibration support (1) according to any one of Claims 1 to 9, wherein said elastic portion (26) includes two parallel elastic strips (27) consisting of said elastic material, separated by a layer of said damping material (7) that adheres to the two elastic strips (27).

12. Anti-vibration support (1) according to Claim 11, wherein said layer of said damping material (7) has a thickness (e1) less than L / 30, where L is a length of said elastic portion between said first end and said second end.

13. Vehicle including a body (CV), a power unit (M) and at least one anti-vibration support (1) according to any one of the preceding claims connecting the body (CV) to the power unit (M).

14. Vehicle according to Claim 13, wherein the power unit (M) includes at least one electric motor.

15. Method for manufacturing an anti-vibration support (1) according to any one of Claims 1 to 12, the suspension (4) of which includes at least one composite part comprising a fibre-reinforced thermoplastic or thermosetting matrix, said fibres being wound between return elements and tensioned, said method comprising producing a structure of fibres, pre-impregnated or not, through the following operations: - aligning and juxtaposing the fibres, while tensioning them between return elements, and keeping them apart from each other, so as to obtain a first layer, - superimposing on said first layer, a second layer obtained identically to the first layer, where the fibres are parallel to those of the first layer, and kept apart from said fibres of the first layer, - repeating the superimposition operation until the desired thickness is obtained.