Damping structure, in particular for motor vehicle

Abstract

The invention relates to a damping structure (50), in particular for a motor vehicle, having a main damping direction (DP) and comprising at least one profiled member (51) made of a composite material containing reinforcing fibers, the profiled member having a substantially cylindrical shape with a linear generatrix, the linear generatrix having a longitudinal axis (DP), the longitudinal axis (DP) being substantially parallel to the longitudinal axis (DP), the longitudinal axis (DP) being substantially parallel to the longitudinal axis (DP), and the longitudinal axis (DP) being substantially parallel to the longitudinal axis (DP), the longitudinal axis (DP) being substantially parallel to the longitudinal axis (DP). The linear generatrix is oriented in a main damping direction.

Description

[0001] The invention relates to a shock absorbing structure, in particular to a shock absorbing structure for a motor vehicle.

[0002] In current hybrid or electric vehicles, battery modules are usually placed on the floor of the vehicle, in particular under the seats. The integration of battery modules into the vehicle requires maximum space for storing the battery modules and requires reliable protection of the battery cells from impacts, such as from side impacts when the vehicle hits a pole on the side of the vehicle.

[0003] The current trend is to use steel or aluminum profiles placed on the side beams to protect the battery modules. These extruded profiles are heavier and incur additional costs. In addition, the use of aluminum increases the CO2 footprint.

[0004] The present invention aims to address at least some of the above-mentioned disadvantages.

[0005] Therefore, a subject of the present invention is a shock-absorbing structure, in particular for a motor vehicle, which has a main shock-absorbing direction and comprises at least one profiled component, which is made of a composite material containing reinforcing fibers, and which has a substantially cylindrical shape with a rectilinear generatrix, which is oriented in the main shock-absorbing direction.

[0006] In the case of profiled components obtained by pultrusion, the reinforcing fibers are oriented along rectilinear generatrixes.

[0007] A cylinder is a surface in space defined by parallel straight lines (generatrixes). A cylindrical shape can have a closed or open outline, with a circular or non-circular cross section. A corrugated shape is an example of a cylindrical shape.

[0008] In the present invention, the profiled component can have a precise cylindrical shape, or in a variant, it has a slightly expanded shape along the straight generatrix. In the latter case, the profiled component can be a frustoconical shape and has a relatively small angle, for example less than or equal to 10°, relative to the straight generatrix.

[0009] According to one of these aspects of the invention, the shock absorbing structure has a generally elongated shape with a longitudinal axis, and the rectilinear generatrix of the profiled member is substantially perpendicular to the longitudinal axis of the shock absorbing structure.

[0010] According to one of these aspects of the invention, the length of the shock absorbing structure measured along the longitudinal axis is at least 20 cm, in particular at least 50 cm, or at least 70 cm or 80 cm or 1 m.

[0011] According to one of these aspects of the invention, the damping structure comprises a plurality of profiled members arranged such that their rectilinear generatrixes are all oriented in the main damping direction.

[0012] According to one of these aspects of the invention, the number of profiled components in the shock absorbing structure is between 5 and 50, in particular between 20 and 40.

[0013] According to one of these aspects of the present invention, the plurality of profiled components are arranged side by side, in particular in one or more rows.

[0014] According to one of the aspects of the present invention, the plurality of profiled components are arranged to be in contact with each other, in particular to be in contact with each other by being tangentially contacted in pairs.

[0015] According to one of these aspects of the invention, the plurality of profiled members are identical to one another.

[0016] In a variant, the profiles differ from one another, have different shapes and / or sizes.

[0017] According to one of these aspects of the invention, the profiled component has a cylindrical shape of revolution, ie a circular cross section.

[0018] According to one of these aspects of the invention, the profiled component has a chamfered edge which is produced in particular by a geometrical cut between a cylinder and an inclined cutting plane.

[0019] According to one of these aspects of the invention, the diameter of the profiled member is between 10 mm and 500 mm, preferably between 10 mm and 250 mm, more preferably between 40 mm and 100 mm.

[0020] According to another aspect of the invention, the profiled component comprises, in a cross section perpendicular to its rectilinear generatrix, at least one open contour configured to receive a contour of an adjacent profiled component.

[0021] According to one of these aspects of the invention, the opening profile is C-shaped.

[0022] According to one of these aspects of the invention, the profiled member comprises, in cross section, a closed profile and an open profile joined together.

[0023] According to one of these aspects of the invention, the diameter of the closed contour is smaller than the diameter of the open contour.

[0024] According to one of these aspects of the invention, the open profile of one of the profiled members is configured to receive the closed profile of another adjacent profiled member.

[0025] According to one of these aspects of the invention, the closed contour of one of the profiled components is inserted into the open contour of the other profiled component by sliding the closed contour into the open contour in the direction of the rectilinear generatrix.

[0026] According to one of these aspects of the invention, the way of fitting two adjacent profiled components together does not require deformation of the profiled components.

[0027] According to one of these aspects of the invention, the shock absorbing structure comprises a series of profiled members that fit into adjacent profiled members.

[0028] According to one of these aspects of the invention, the profiled component is obtained by extrusion or pultrusion.

[0029] In a variant embodiment of the invention, the profiled component is formed by at least one composite material sheet, which in particular contains reinforcing fibers.

[0030] According to one of these aspects of the invention, the profiled component is made from a single composite material sheet.

[0031] According to one of these aspects of the invention, the sheet has a corrugated shape.

[0032] According to one of these aspects of the invention, the sheet has at least 10 or 20 corrugations.

[0033] According to one of the aspects of the invention, the successive corrugations are identical. In a variant, within a series of corrugations, some of the corrugations may have different shapes and / or sizes.

[0034] According to one of the aspects of the invention, the corrugations develop along the longitudinal axis of the shock absorbing structure.

[0035] According to one of these aspects of the invention, the sheet has chamfered edges at some of the corrugations, in particular at each of the corrugations.

[0036] According to one of these aspects of the invention, the sheet is a pre-impregnated composite panel, the corrugation of which is obtained by thermoforming, in particular by thermoforming in a mold. The sheet can also be obtained by extrusion or pultrusion into blocks and by cutting to have a desired width (for example, a width corresponding to the transverse direction of the vehicle) and by assembling these blocks.

[0037] According to one of these aspects of the invention, the shock absorbing structure comprises a shape overmolded onto the profiled member.

[0038] According to one of these aspects of the invention, the overmoulded shape comprises at least one wall, in particular a plurality of walls.

[0039] According to one of these aspects of the invention, the walls may be parallel.

[0040] In case of a corrugated sheet material, the overmoulded shape comprises a corrugated shape, in particular a corrugated shape complementary to the corrugations of the sheet material.

[0041] Thus, the shock absorbing structure may comprise cylinders aligned side by side, each cylinder (or shaped member) being formed half from the sheet material and half from the overmoulded shape.

[0042] In this case, the sheet material and the overmoulded shape define a one-piece piece.

[0043] In a variant, the profiled element is formed from two composite sheets, and each profiled element is formed in particular half from one of these sheets and half from the other of these sheets. For example, each sheet forms a series of semi-cylinders, and the semi-cylinders of the two sheets face each other in pairs to form a row of complete cylinders as the profiled element.

[0044] In this exemplary embodiment of the invention, two sheets are assembled together, for example by welding.

[0045] The half cylinder of each sheet is in particular tangential to a geometrical plane which defines the joining plane between the two sheets.

[0046] Typically, the cylinder can be slightly flared, in particular with a flaring angle of less than or equal to 10°.

[0047] According to one of these aspects of the invention, at least one of the sheets, in particular two sheets, is made to have an interface shape, which is in particular obtained by overmolding, and which is configured, for example, to enable the shock absorbing structure to be fastened to a structural component of a motor vehicle.

[0048] According to one of these aspects of the invention, the interface shape, in particular the overmoulded interface shape, is present over the entire length of the sheet.

[0049] According to one of these aspects of the invention, the interface shape defines strips of material, for example two parallel strips of material, which extend along the edges of the corrugations in the sheet.

[0050] According to another aspect of the invention, the interface shape defines a front wall and a rear wall, the front wall and the rear wall are particularly planar and parallel, and a semi-cylinder formed by the sheet extends between the front wall and the rear wall. For example, the opposite ends of each cylinder are respectively on the front wall and the rear wall.

[0051] According to one of these aspects of the invention, the front wall and / or the rear wall has a cheek (especially of substantially circular or oval shape) placed in a recess of the overmoulded shape of the other sheet. The cheek thus makes it possible to close one end of the cylinder resulting from the assembly of two semi-cylinders of the two sheets.

[0052] The interface shape, in particular an overmoulded interface shape, can be configured to produce a joint, in particular a welded joint, between the two sheets.

[0053] According to one of these aspects of the invention, the interface shape defines strips, in particular strips parallel to one another, each strip being present at the junction between two adjacent half-cylinders of the sheet.

[0054] Of course, the interface shape may have geometries other than those described above.

[0055] Typically, as seen above, the corrugations of the shock absorbing structure can be formed from a single sheet which additionally has an overmolded shape, or in a variant, the corrugations of the shock absorbing structure can be formed from two sheets (possibly having each of these interface shapes) assembled together, for example by welding.

[0056] According to one of these aspects of the invention, the shock-absorbing structure comprises a reinforcing plate, for example made of steel or aluminum or a composite material, which is placed on one side of the profiled component, in particular on the side that is the rear part of the profiled component (that is to say, for example, on the innermost side relative to the vehicle). This reinforcing plate makes it possible to increase the mechanical strength of the shock-absorbing structure. This reinforcing plate extends in particular along the entire row of profiled components. The reinforcing plate is substantially rectangular, possibly with holes.

[0057] According to one of these aspects of the invention, the shock absorbing structure is configured to be placed on a lateral edge of a motor vehicle, for example inside a side sill.

[0058] In this case, the damping structure can be arranged before assembling the side member, which comprises, for example, two shapes, for example two complementary half-shells, which are usually made of metal and assembled by welding.

[0059] According to one of these aspects of the invention, the shock absorbing structure is configured to be integrated on one or more floor cross members.

[0060] According to one of these aspects of the invention, the shock absorbing structure is configured to be placed on a lateral edge of an energy storage device, which in particular comprises a battery cell.

[0061] According to one of these aspects of the invention, the energy storage device is placed on the floor of the motor vehicle.

[0062] According to one of these aspects of the invention, the profiled component comprises a shape, in particular an end shape, which is configured such that it can be fastened or assembled in a side member of a vehicle.

[0063] According to one of these aspects of the invention, the shock absorbing structure includes one or more shock absorbing foams located within the cavity of the profiled member.

[0064] Another subject of the invention is an assembly comprising an energy storage device and a shock-absorbing structure as described above and configured to be placed on a lateral edge of the energy storage device.

[0065] According to one of these aspects of the invention, the shock absorbing structure is configured to be placed on a lateral edge of a motor vehicle, for example inside a side sill.

[0066] Another subject matter of the invention is a vehicle having the above-described assembly.

[0067] The invention is advantageous in that the shock absorbing structure allows for effective absorption of impacts occurring to the shock absorbing structure. Specifically, the profiled member is positioned to have the greatest resistance to compression forces for the main shock absorbing direction.

[0068] When the profiled component is made by extrusion or pultrusion, the reinforcing fibers are oriented in the direction of extrusion or pultrusion so that the profiled component has the greatest resistance to compressive forces along a straight generatrix.

[0069] This arrangement of the profiled component is more advantageous in terms of compression resistance than, for example, a case where the profiled component is placed with its rectilinear generatrix perpendicular to the main damping direction.

[0070] In other words, it can be said that the reinforcing fibers are aligned in the main shock absorbing direction so as to provide high compression performance.

[0071] Another subject matter of the invention is a method for producing a shock-absorbing structure, in particular a shock-absorbing structure for a motor vehicle, the shock-absorbing structure having a main shock-absorbing direction, the method comprising the following steps:

[0072] - at least one profiled component made of a composite material containing reinforcing fibers, in particular by pultrusion or extrusion, having a cylindrical shape with rectilinear generatrix,

[0073] - optionally cutting the shaped component into predetermined sizes,

[0074] - This profiled component is placed in the damping structure, the profiled component being oriented so that the straight generatrix is ​​oriented in the main damping direction.

[0075] The continuous reinforcing fibers are produced by means of the pultrusion process and, in the case of applications in vehicle side member reinforcements, are oriented in the transverse direction of the vehicle. Due to the pultrusion process of the continuous movement of the material leaving the pultrusion machine, in contrast, known uses use continuous fibers in the longitudinal direction of the vehicle.

[0076] In the present invention, there is a cutting step after pultrusion to have a profiled member of a predetermined size, followed by an assembling step to have a shock absorbing structure of a predetermined length.

[0077] The cutting makes it possible to adapt to different shapes, for example in vehicle side beams.

[0078] As stated above, the present invention makes it possible to have a continuous fiber orientation in the main impact direction.

[0079] The method may comprise the steps of forming profiled components by assembling, in particular by welding, two composite material sheets, in particular pre-formed with corrugations, and each profiled component being formed substantially half from one of these sheets and half from the other of these sheets.

[0080] In a variation, the method may include the step of forming the profiled member on a single composite sheet having the overmoulded shape.

[0081] Other characteristics, details and advantages of the invention will become more apparent on the one hand by reading the following description and on the other hand by reference to several exemplary embodiments given by way of non-limiting indication with reference to the attached schematic drawings, in which:

[0082] [ Figure 1 ] Figure 1 is a schematic partial perspective representation of an assembly having two shock absorbing structures according to an example of the present invention;

[0083] [ Figure 2 ] Figure 2 yes Figure 1 A schematic partial perspective representation of one of the shock absorbing structures of the invention;

[0084] [ Figure 3 ] Figure 3 yes Figure 2 A cross-sectional view of a special-shaped component of a shock absorbing structure;

[0085] [ Figure 4 ] Figure 4 is a schematic partial representation of a shock absorbing structure according to another example of the present invention;

[0086] [ Figure 5 ] Figure 5 yes Figure 4 A three-dimensional diagram of a special-shaped component of a shock-absorbing structure;

[0087] [ Figure 6 ] Figure 6 is a schematic partial representation of a sheet of a shock absorbing structure according to another example of the present invention;

[0088] [ Figure 7 ] Figure 7 yes Figure 6 Three-dimensional representation of the shock absorbing structure;

[0089] [ Figure 8 ] Figure 8 is a three-dimensional representation of a shock absorbing structure according to another example of the present invention;

[0090] [ Fig. 9 ] Fig. 9 yes Figure 8 Exploded three-dimensional representation of the shock absorbing structure;

[0091] [ Fig.10 ] Fig.10 yes Figure 8 A three-dimensional representation of a shock absorbing structure, in which the different elements are shown separately.

[0092] The features, variants and different embodiments of the present invention can be combined with each other in different combinations, as long as they are not mutually incompatible or mutually exclusive. In particular, it is conceivable that the variant of the present invention only includes the selection of the features described below that are separated from the other features described, provided that this selection of features is sufficient to confer technical advantages and / or distinguish the present invention from the prior art.

[0093] Figure 1 Very schematically shown is a schematic diagram of a motor vehicle V (in Figure 1 The two shock-absorbing structures 1 (of which only a few parts of the motor vehicle can be seen) belong to an assembly 100 including an energy storage device 101. This energy storage device 101 comprises a battery cell module (not shown) and is placed on the floor of the vehicle V.

[0094] The damping structure 1 is placed respectively on two parallel lateral edges of the energy storage device 101 , ie on both sides of the vehicle.

[0095] Each shock absorbing structure 1 is configured to be placed / integrated in a side member of a vehicle V.

[0096] Each shock absorbing structure 1 has a main shock absorbing direction DP transverse to the longitudinal direction DL of the vehicle. Each shock absorbing structure 1 is suitable for withstanding impacts occurring laterally on the vehicle.

[0097] In the example described, Figure 2 As best shown, each shock absorbing structure 1 comprises a row of profiled elements 2 made of a composite material (eg polymer material) containing reinforcing fibers (eg glass or carbon fibers). All identical profiled elements 2 are linked together in the row.

[0098] like Figure 3 As shown, each profiled component 2 has a cylindrical shape with a straight generatrix DG which is oriented in the main damping direction DP.

[0099] The profiled member 2 is obtained by pultrusion, and the reinforcing fibers are oriented along a straight generatrix DG.

[0100] The cross section of the special-shaped member 2 is circular.

[0101] The shock absorbing structure 1 has a generally elongated shape with a longitudinal axis AL, and the rectilinear generatrix DG of the profiled member 2 is substantially perpendicular to the longitudinal axis AL of the shock absorbing structure 1. The longitudinal axis AL of the shock absorbing structure 1 is substantially parallel to the longitudinal direction DL of the vehicle.

[0102] This arrangement of the profiled element 2 is more advantageous in terms of resistance to compression than, for example, a situation in which the profiled element is placed with its rectilinear generatrix DG perpendicular to the main damping direction DP.

[0103] In other words, it can be said that the reinforcing fibers are aligned in the main damping direction DP so as to provide high compression performance.

[0104] The length of the shock absorbing structure measured along the longitudinal axis AL is at least 20 cm, in particular at least 50 cm, or at least 70 cm or 80 cm or 1 m.

[0105] The plurality of profiled components 2 are arranged so that their straight generatrixes DG are all oriented in the main damping direction DP.

[0106] The number of profiled components in the damping structure 1 is between 5 and 50, in particular between 20 and 40.

[0107] A plurality of profiled components 2 are arranged to be in contact with each other, in particular, to be in contact with each other by being tangentially contacted in pairs.

[0108] Each profiled component 2 has a chamfered edge 4 which results from a geometric cut between a cylinder and an inclined cutting plane.

[0109] exist Figure 4 and Figure 5 In another exemplary embodiment of the invention shown, the profiled element 20 comprises, in a section perpendicular to its rectilinear generatrix DG, an open profile 21 configured to receive the profile of an adjacent profiled element 20 .

[0110] The opening profile 21 has a C-shape.

[0111] In the example described, each profiled component 20 comprises, in cross section, a closed contour 22 and an open contour 21 which are joined together.

[0112] The diameter of the closed contour 22 is smaller than the diameter of the open contour 21 .

[0113] The open contour 21 of one of the profiled components 20 is configured to receive the closed contour 22 of another adjacent profiled component.

[0114] The closed contour 22 of one of these profiled components is inserted into the open contour 21 of the other profiled component by sliding the closed contour 22 into the open contour 21 in the direction of the straight generatrix DG.

[0115] This way of assembling two adjacent profiled components 20 does not require deformation of the profiled components.

[0116] Here, the shock absorbing structure 25 comprises a series of profiled members 20 which fit into adjacent profiled members.

[0117] The profiled member 20 is obtained by extrusion or pultrusion.

[0118] exist Figure 6 and Figure 7 In the illustrated variant embodiment of the present invention, the profiled member 30 has a shape generally identical to that of the profiled member 2 described above, and is formed from a composite material sheet 31 containing reinforcing fibers.

[0119] The sheet 31 has a corrugated shape, with 10 to 20 corrugations 33. Successive corrugations are identical. In a variant, in a series of corrugations, some of the corrugations may have different shapes and / or sizes.

[0120] The corrugations 33 develop along a longitudinal axis AL of the damping structure 35 .

[0121] The sheet 31 comprises a chamfered edge 34 at each corrugation 33 .

[0122] The corrugations 33 of the sheet 31 are obtained by hot-molding the sheet in a mold. The sheet 31 can also be obtained by extruding or pultruding into blocks and by cutting to have a desired width (eg, a width corresponding to the transverse direction of the vehicle) and by assembling the blocks.

[0123] The shock absorbing structure 35 includes an overmolded shape 37 to form the profiled member 30 .

[0124] The overmoulded shape 37 comprises a corrugated shape, here a corrugated shape complementary to the corrugations 33 of the sheet.

[0125] Thus, the shock absorbing structure 35 may include cylinders aligned side by side, each cylinder being formed half from the sheet 31 and half from the overmolded shape 37 .

[0126] Typically, the damping structure 1 , 25 or 35 can be arranged before assembling the side member, which comprises, for example, two shapes, for example two complementary half-shells, which are typically made of metal and assembled by welding.

[0127] In a variant, the shock-absorbing structure 1 , 25 or 35 is designed to be integrated on one or more floor cross members.

[0128] The shock absorbing structure 1 , 25 or 35 may include one or more shock absorbing foams within the cavity of the profiled member.

[0129] Now refer to Figures 8 to 10 A description is given of a shock absorbing structure 50 according to another exemplary embodiment of the present invention.

[0130] As in the examples described above, the shock absorbing structure 50 includes a profiled member 51 in the form of a cylinder.

[0131] The special-shaped member 51 is composed of two composite material sheets 52 (in Fig.10 The shaped members 51 are formed by one sheet of the sheets 52 and the other sheet of the sheets 52. In particular, each sheet 52 forms a series of semi-cylinders 53, and the semi-cylinders 53 of the two sheets 52 face each other in pairs to form a row of complete cylinders as the shaped members 51.

[0132] In this exemplary embodiment of the invention, the two sheets 52 are assembled together by welding.

[0133] The semi-cylindrical body 53 of each sheet 52 is Fig. 9 The geometrical plane PG shown in FIG. 5 is tangent to the geometrical plane PG shown in FIG. This geometrical plane defines the joining plane between the two sheets 52 .

[0134] The two sheets 52 are made with interface shapes 55 obtained by overmolding, which are configured to allow the shock-absorbing structure 50 to be fastened to a structural component (not shown) of a motor vehicle. Fig.10 5. It is shown, for explanation purposes, separated from the sheet 52.

[0135] However, it must be understood that Fig. 9 As shown, these interface shapes 55 are connected to the sheets 52 due to overmoulding. The two sheets 52 together with their interface shapes 55 are assembled together as two separate parts.

[0136] The interface shape 55 made of plastic is present over the entire length of the sheet 52 and defines material strips, here two parallel material strips, which extend along the edges of the corrugations on the sheet 52 .

[0137] Thus, the interface shape 55 forms a corrugated frame 56 which surrounds the corresponding sheet 52 .

[0138] Fastening lugs 58 , for example made of metal, are fastened to the interface shape 55 , making it possible to fasten the shock-absorbing structure 50 to a structural component of a motor vehicle.

[0139] The interface shape 55 is configured to form a joint between the two sheets 52 by welding.

[0140] The interface shape 55 defines mutually parallel strips 59 , each strip being present at the junction between two adjacent half-cylinders 53 of the sheet 52 .

[0141] Of course, the interface shape may have geometries other than those described above.

[0142] The shock-absorbing structure 50 comprises a reinforcing plate 60, for example made of steel or aluminum or a composite material, which is placed on one side of the profiled member 51, here on the side that is the rear part of the profiled member (that is to say, for example, on the innermost side relative to the vehicle). This reinforcing plate 60 makes it possible to reinforce the mechanical strength of the shock-absorbing structure 50. This reinforcing plate 60 extends all along the row of profiled members 51. The reinforcing plate 60 is substantially rectangular with holes 61 (especially holes that allow weight reduction).

Claims

1. A shock absorbing structure (1, 25, 35, 50), in particular for a motor vehicle, having a main shock absorbing direction (DP) and comprising at least one profiled component (2, 20, 30, 51), the at least one profiled component being made of a composite material containing reinforcing fibers, the profiled component having a substantially cylindrical shape, the cylindrical shape having a rectilinear generatrix (DG) which is oriented in the main shock absorbing direction (DP).

2. A shock absorbing structure according to the preceding claim, wherein: The profiled component is formed from at least one sheet (31, 52) made of a composite material containing reinforcing fibers.

3. A shock absorbing structure according to the preceding claim, wherein: The special-shaped component (20) is made of a single composite material sheet.

4. The shock absorbing structure according to claim 2, wherein: The shaped components (51) are formed by two composite material sheets (52), and each shaped component (51) is particularly formed by half of one of the sheets (52) and half of the other of the sheets (52), and each sheet particularly forms a series of semi-cylinders.

5. Shock-absorbing structure according to the preceding claim, wherein: At least one of the sheets (52), in particular both sheets, is made with an interface shape (55), in particular obtained by overmolding, which is configured, for example, to enable the damping structure (50) to be fastened to a structural component of a motor vehicle.

6. A shock absorbing structure according to any one of the preceding claims, wherein: The damping structure (1, 25, 35) has a generally elongated shape having a longitudinal axis (AL), and the rectilinear generatrix of the profiled member (2, 20, 30) is substantially perpendicular to the longitudinal axis of the damping structure.

7. A shock absorbing structure according to any one of the preceding claims, wherein: The plurality of special-shaped components (2, 20, 30) are arranged side by side, in particular in one or more rows.

8. An assembly (100) comprising an energy storage device and a shock absorbing structure (1, 25, 35, 50) according to one of the preceding claims, and the shock absorbing structure is configured to be placed on a lateral edge of the energy storage device (101).

9. A method for producing a shock-absorbing structure, in particular a shock-absorbing structure for a motor vehicle, the shock-absorbing structure having a main shock-absorbing direction, the method comprising the following steps: - at least one profiled component (2, 20, 30, 50) made of a composite material containing reinforcing fibers, in particular by pultrusion or extrusion, having a cylindrical shape with rectilinear generatrix, - optionally cutting the shaped component into a predetermined size, - placing the profiled element (2, 20, 30, 50) in the damping structure, the profiled element being oriented so that the straight generatrix is ​​oriented in the main damping direction.

10. The method according to the preceding claim, comprising the following steps: The profiled components are formed by assembling, in particular by welding, two composite material sheets (52), and each profiled component is formed substantially half from one of the sheets and half from the other of the sheets.

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