Reinforced structure of motor vehicle

Abstract

The invention relates to a motor vehicle structure (12). The structure (12) comprises a passenger compartment (14), a central steel longitudinal member (22) extending along the passenger compartment (14); a front pillar (24), also called the front foot, made of steel and located in front of the passenger compartment; an angled recess (32) extending into the central longitudinal member and the front pillar (24); and a reinforcing piece (34) within the angled recess (32). The reinforcing piece (34) comprises a first aluminum profile (36) extending into the central longitudinal member (22), and a second aluminum profile (38) extending into the front pillar (24) and attached to the first profile (36). The invention also relates to a method for manufacturing a structure. Figure to be published with the abbreviation: Figure 2

Description

Title of the invention: Reinforced structure of a motor vehicle

[0001] The invention relates to the strength of a motor vehicle structure. The invention concerns side and frontal collisions stressing a motor vehicle structure. The invention provides a motor vehicle structure. The invention also relates to a motor vehicle. The invention also relates to a method for manufacturing a motor vehicle structure.

[0002] A motor vehicle comprises a structure forming a main frame that connects all of its components. In particular, the structure connects the various shock absorber systems and the steering system. It supports a motor and an energy storage unit. In the case of an electric drive, the motor vehicle has a multi-hundred-kilogram battery housed in the underbody. Locally, the structure forms the exterior body of the motor vehicle. Thus, the structure is also subject to perceived quality requirements and must therefore adhere to a precise geometry. This allows, among other things, for the creation of precise mechanical clearances.

[0003] The structure delineates the various compartments of the motor vehicle, including the front compartment, the rear cargo area, and the passenger compartment. To this end, the structure comprises several longitudinal members in its lower section, floor panels, and cross members. The structure also includes pillars, such as front pillars, central pillars, and rear pillars. All these elements ensure the rigidity of the structure and contribute to the passive safety of the vehicle, particularly in the event of a collision with a fixed obstacle or another vehicle.

[0004] In the event of a side collision, the central side members form a barrier between the obstacle and the passenger compartment. By doing so, they protect the passengers by deforming. To improve safety, they are equipped with a series of reinforcements. A side member reinforcement and a front pillar reinforcement are components of high rigidity and thickness to ensure the body remains intact in the event of an impact. They are generally massive and composed of multiple elements. Their production and subsequent integration are therefore complex.

[0005] Document FR3077554B1 describes a motor vehicle structure. The structure comprises a front pillar reinforcement piece having a horizontal portion extending along the longitudinal direction of the vehicle, showing a semi-hemispherical end and a side member. The front pillar reinforcement piece and the side member are each in the form of a half-shell defining a cavity, said piece and said side member overlapping at one of their ends. The end of the front pillar reinforcement piece overlapping the side member is devoid of assembly grooves.

[0006] The invention aims to address at least one of the problems or drawbacks encountered in the prior art. In particular, the invention aims to improve the safety of a motor vehicle. The invention also aims to optimize the safety, weight, and ease of assembly inherent in a motor vehicle structure.

[0007] According to a first aspect, the invention proposes a motor vehicle structure, the structure comprising a passenger compartment, a central steel longitudinal member extending along the passenger compartment, a steel front pillar and in front of the passenger compartment; an angled recess extending in the central longitudinal member and in the front pillar; a reinforcement piece in the angled recess; notable in that the reinforcement piece comprises a first aluminum profile extending in the central longitudinal member, a second aluminum profile extending in the front pillar and fixed to the first profile.

[0008] The reinforcing piece combines two aluminum profiles. These inherently strong elements contribute to the rigidity of the structure. In particular, their behavior in the event of a collision optimizes resistance and energy absorption. This therefore contributes to safety.

[0009] Preferably, the reinforcing piece includes a reinforcing bracket fixed to the first profile and the second profile.

[0010] Preferably, the reinforcing bracket comprises two reinforcing wings and a plate connecting the reinforcing wings.

[0011] Preferably, the first profile and the second profile each comprise a closed profile.

[0012] Preferably, the first profile and / or the second profile is a profile with a rectangular cross-section.

[0013] Preferably, the second profile is inclined relative to the first profile by an angle of inclination between 91° and 100°; more preferably between 92° and 95°.

[0014] Preferably, the first profile and the second profile are fixed by welding; the first profile and the second profile are fixed by a weld bead surrounding the first profile and / or the second profile.

[0015] Preferably, in the angled recess, the structure includes at least one retaining plate for the reinforcing piece.

[0016] Preferably, the first profile includes a stiffening strip; the stiffening strip extending vertically.

[0017] Preferably, the central spar comprises an inner shell with an internal cavity and an outer shell with an external cavity and an internal surface, the first profile being fixed to the inner shell.

[0018] Preferably, the first profile extends into the internal cavity and into the external cavity, and is at a distance from the internal surface.

[0019] Preferably, the structure has a front partition defining a front wheel arch, and a rear partition defining a rear wheel arch; the first profile extending longitudinally to the rear partition, and the second profile extending longitudinally to the front partition.

[0020] Preferably, the angled recess is a continuous recess.

[0021] Preferably, the structure comprises a bay jamb extending vertically from the front pillar, the second profile being vertically at a distance from the bay jamb.

[0022] Preferably, the reinforcing piece is one piece.

[0023] Preferably, the second profile extends vertically at the level of the first profile.

[0024] Preferably, the first profile came from material.

[0025] Preferably, the second profile came from material.

[0026] Preferably, the first profile and the second profile define an angle between them, the reinforcing bracket being in said angle.

[0027] Preferably, the first profile is a tube with an internal stiffening core.

[0028] Preferably, the inner shell comprises an internal vertical partition, the outer shell comprises an external vertical partition, the first profile being fixed to the internal vertical partition and being transversely at a distance from the external vertical partition.

[0029] Preferably, at least one of the first profile and of the second profile is arched.

[0030] Preferably, the first profile and the second profile comprise different lengths.

[0031] Preferably, the first profile has a linear mass greater than that of the second profile.

[0032] Preferably, the inner shell and the outer shell are fixed to each other by rebates, the first profile being vertically at a distance from said rebates.

[0033] According to another aspect, the invention provides a motor vehicle structure, the structure comprising a passenger compartment, a central longitudinal member extending along the passenger compartment, a front pillar in front of the passenger compartment; a reinforcing piece extending into the central longitudinal member and the front pillar; notable in that the reinforcing piece comprises a first profile extending into the central longitudinal member, a second profile extending into the front pillar and fixed to the first profile; the reinforcing piece comprising a material different from that of the central longitudinal member and / or the pillar front. The reinforcement piece helps improve behavior in the event of a collision, particularly a side collision.

[0034] According to another aspect, the invention proposes a motor vehicle structure, the structure comprising: a passenger compartment, a central longitudinal member extending along the passenger compartment, and a front pillar in front of the passenger compartment; notable in that the structure further comprises an aluminum reinforcement piece extending into the central longitudinal member and the front pillar to connect them. The reinforcement piece improves behavior in the event of a collision, particularly a side collision.

[0035] According to another aspect, the invention proposes a motor vehicle comprising a structure; remarkable in that the structure conforms to the invention.

[0036] Preferably, the structure comprises a front apron with a first height, the second profile comprising a second height greater than or equal to the first height.

[0037] Preferably, the motor vehicle includes rear seats, the first profile extending along the rear seats.

[0038] According to another aspect, the invention proposes a method for manufacturing a motor vehicle structure comprising a passenger compartment, a central steel longitudinal member extending along the passenger compartment, a steel front pillar, and in front of the passenger compartment; the manufacturing method comprising the following steps: a) making an assembly comprising an inner shell of the central longitudinal member and an inner part of the front pillar extending vertically from the inner shell; remarkable in that the manufacturing method further comprises the steps: b) fixing a first aluminum profile to a second aluminum profile in order to form a reinforcing piece, c) positioning and fixing the reinforcing piece by positioning the first profile in the inner shell and positioning the second profile in the inner part;d) assembly of an outer shell of the central spar onto the inner shell, and of an outer part of the front pillar to the inner part in order to cover the reinforcing piece. ;

[0039] Preferably, the structure conforms to the invention.

[0040] Preferably, the motor vehicle conforms to the invention.

[0041] Each feature introduced by the expression "preferably" given in relation to one of the aspects of the invention applies to all other aspects of the invention.

[0042] The invention will be well understood and other aspects and advantages will become clear upon reading the following description, given with reference to the attached figures listed below.

[0043] Fig. 1 is a side view of a motor vehicle according to the invention.

[0044] Fig. 2 shows a motor vehicle structure according to the invention.

[0045] Fig. 3 represents a structural reinforcement part of a motor vehicle according to the invention.

[0046] Fig. 4 is a cross-section of a motor vehicle structure according to the invention.

[0047] Fig. 5 is a diagram of a method for manufacturing a motor vehicle structure according to the invention.

[0048] In the following description, the term "include" is synonymous with "include" and is not limiting in that it permits the presence of other elements in the motor vehicle or other steps in the process to which it relates. It is understood that the term "include" includes the terms "consist of." The terms "external" and "internal" shall respectively refer to what is directed outward from the vehicle and inward from the vehicle.

[0049] In this description, the terms "longitudinal," "longitudinally," "transverse," and "transversely" are used with respect to the vehicle's frame of reference in the mounting configuration. "Longitudinal" refers to the vehicle's principal direction of travel. "Transverse" refers to a direction perpendicular to the vehicle's principal direction of travel. "Front" refers to the vehicle's principal direction of travel. "Rear" refers to the opposite of the front of the vehicle.

[0050] The X-axis represents the longitudinal direction, the Y-axis represents the transverse direction, and the Z-axis represents the vertical direction of the motor vehicle. These three axes define a right-handed trihedron whose orientation is preserved throughout the figures.

[0051] In this description, the ranges of values ​​include the bounds that delimit them.

[0052] In the present description, the equality between the values ​​is not to be understood in the strict sense insofar as each equality allows a variation of at most 10%, preferably at most 5%, more preferably at most 2%, between these values.

[0053] In this description, the terms "vertical" and "horizontal" are not to be understood in the strict sense. Indeed, they allow an inclination of at most 20°, preferably at most 10°, more preferably at most 5°, and even more preferably at most 2°; with respect to the strict meaning of these terms.

[0054] In this description, the technical characteristics are defined in the mounting configuration of the structure, unless otherwise explicitly stated.

[0055] Throughout the description, the different figures use the same reference signs to designate identical or similar entities.

[0056] Figure 1 represents a motor vehicle 10, according to an embodiment of the invention. The motor vehicle 10 comprises energy storage means and at least one engine (not shown) suitable to drive said motor vehicle 10.

[0057] The motor vehicle 10 comprises a structure 12. The structure 12 delimits various compartments of the motor vehicle 10, including the passenger compartment 14, the cargo area, and the engine compartment (not shown). The structure 12 connects various parts of the motor vehicle 10, including the openings. The structure 12 forms a mounting support for the powertrain, suspension systems, steering system, and braking systems.

[0058] The passenger compartment 14 has several seating positions; with seats. The seats are arranged in rows. The passenger compartment 14 has rear seats 16, behind front seats. The passenger compartment 14 is delimited by the windshield 17.

[0059] The motor vehicle 10 also has wheel arches, including the front wheel arches 18 and the rear wheel arches 20. The front wheel arches 18 and the rear wheel arches 20 allow the suspension travel of the associated wheels, as well as the movement specific to the steering wheels.

[0060] The structure 12 has several components, including the central side members 22. The central side members 22 extend from the front wheel arches 18 to the rear wheel arches 20. The central side members 22 extend along the passenger compartment 14, and in particular along the rear seats 16. The central side members 22 are main side members. The structure 12 also has front and rear side members, which extend respectively along the front wheel arches 18 and the rear wheel arches 20.

[0061] The structure 12 also has front pillars 24, also called front feet, in front of the passenger compartment 14. The front pillars 24 are vertically aligned with the front compartment. The front pillars 24 are below the windshield 17, which is bordered laterally by the window pillars. The window pillars extend vertically from the front pillars 24. The front openings are attached to the front pillars 24.

[0062] The structure 12 also includes a front apron 26. The front apron 26 forms a partition between the front compartment and the passenger compartment 14. It is located below the windshield 17. The front apron 26 extends vertically. It connects transversely to the front pillars 24. The front apron 26 includes a first height. The first height is an average height. It is measured between its opposite vertical ends.

[0063] The motor vehicle can, for example, be a private motor vehicle or a commercial motor vehicle.

[0064] Figure 2 shows a motor vehicle structure 12, according to an embodiment of the invention. The motor vehicle may correspond to the one shown in relation to [Fig. 1]. The openings and part of the bodywork are not shown for clarity.

[0065] The structure 12 forms an outer body, or the main frame of the motor vehicle. The structure 12 may be formed from an assembly of stamped and welded sheet metal. The structure is essentially made of steel. The structure 12 delimits a passenger compartment 14. The structure 12 is symmetrical. Hereafter, reference will be made to the left side of the structure 12; however, this description also applies to the right side.

[0066] The structure 12 includes a central steel longitudinal member 22 extending along the passenger compartment 14. The central longitudinal member 22 is a lateral longitudinal member. It defines the openings for the side doors. It is hollow. The central longitudinal member 22 is longitudinally positioned between the front longitudinal member 28 and the rear longitudinal member 30.

[0067] The structure 12 also includes a steel front pillar 24 located in front of the passenger compartment 14. The front pillar 24 is at the forward end of the passenger compartment 14. Both the front pillar 24 and the central longitudinal member 22 are hollow. They define an angled recess 32. The angled recess 32 forms a passage extending into the central longitudinal member 22 and the front pillar 24, which are fixed to each other. The angled recess 32 is a continuous recess. It forms a passage connecting the front pillar 24 and the central longitudinal member 22. It generally has an equal cross-sectional area.

[0068] To improve safety, and in particular the behavior of the structure 12 in the event of a high-speed collision, the structure is equipped with a reinforcing piece 34 in the angled recess 32. A high-speed collision is defined as a frontal collision at at least 50 km / h, or a side collision at at least 30 km / h. The reinforcing piece 34 helps control the deformation of the structure 12, and in particular limits deformations of the passenger compartment 14. The reinforcing piece 34 reduces intrusions.

[0069] Generally, the structure 12 includes an aluminum insert, or an aluminum bracket. The reinforcing piece 34 comprises a first aluminum profile 36 extending into the central longitudinal member 22, and a second aluminum profile 38 extending into the front pillar 24. The second profile 38 is fixed to the first profile 36. The profiles are respectively a horizontal profile and a vertical profile.

[0070] The profiles are essentially straight. This characteristic gives them specific strength. Their strength is particularly enhanced in the case of dynamic stresses, such as a high-speed collision. Indeed, the profiles effectively resist the peak force generated during a collision. Furthermore, the aluminum material exhibits significant absorption of impact energy. Thus, each aluminum profile improves safety, in addition to the weight reduction it provides.

[0071] The second profile 38 extends along the entire height of the front pillar 24. The second profile 38 includes a second height greater than or equal to the first height of the front apron (not shown). The first profile 36 extends longitudinally along the entire length of the central longitudinal member 22. Thus, the reinforcing piece 34 forms complete protection in the angled recess.

[0072] The structure 12 includes a bay jamb 72 extending vertically from the front pillar 24. The second profile 38 is vertically spaced away from the bay jamb 72.

[0073] The structure 12 has a front partition 40 that at least partially delimits the front wheel arch 18. The structure 12 also has a rear partition 42 that delimits a rear wheel arch 20. The first profile 36 extends longitudinally to the rear partition 42. The second profile 38 extends longitudinally to the front partition 40. Generally, the reinforcing piece 34 connects the front wheel arch 18 to the rear wheel arch 20.

[0074] The reinforcement piece 34 is extended. This increases its bearing surface and improves the distribution of forces in the event of a collision. This reduces deformation of the passenger compartment.

[0075] Figure 3 shows a reinforcing piece 34 for a motor vehicle structure, according to an embodiment of the invention. The motor vehicle may correspond to the one shown in relation to one of Figures 1 to 2.

[0076] The reinforcing piece 34 is itself angled. It generally forms a reinforcing elbow. The first profile 36 extends mainly horizontally. The second profile 38 extends mainly vertically. They are substantially perpendicular, or substantially offset from a strictly perpendicular configuration. The second profile 38 is inclined relative to the first profile 36 at an angle of inclination 44 between 91° and 100°. Preferably, the angle of inclination 44 is between 92° and 95°. The angle of inclination 44 is an average angle. It is measured between the rear face of the second profile 38 and the upper face of the first profile 36.

[0077] The configuration of the two-pronged reinforcement piece 34 maintains the angle between the front pillar and the central longitudinal member. This feature reduces deformation of the passenger compartment in the event of a frontal impact. Furthermore, the presence of two profiles fixed to each other increases the geometric possibilities.

[0078] The reinforcing piece 34 includes a reinforcing bracket 46 fixed to the first profile 36 and the second profile 38. The reinforcing bracket 46 is made of aluminum. It is advantageously welded. The reinforcing bracket 46 includes two reinforcing wings 68 and a plate connecting the reinforcing wings 68. The plate is located in front of and between the reinforcing wings 68. The reinforcing wings 68 extend vertically and rearward. The reinforcing bracket 46 forms a strut that maintains the angle of inclination. 44. It contributes to improving the behavior of the reinforcement piece 34 during a collision.

[0079] The first profile 36 and the second profile 38 are joined by welding. The first profile 36 and the second profile 38 are joined by a weld bead 48 surrounding the first profile 36. The second profile 38 extends vertically at the level of the first profile 36. It overlaps it vertically. The first profile 36 is longitudinally abutted against the second profile 38. The weld bead 48 is against a rear face of the second profile 38.

[0080] The first profile 36 and the second profile 38 each comprise a closed profile. They each define a loop around their central axis. The first profile 36 and the second profile 38 are profiles with a rectangular or square cross-section.

[0081] According to an alternative of the invention, the first profile and the second profile are fixed by a weld bead surrounding the second profile.

[0082] According to an alternative of the invention, the first profile and the second profile are beveled, and the weld bead is at their bevels.

[0083] According to an alternative of the invention, the first profile and / or the second profile comprises an angle.

[0084] According to an alternative of the invention, the first profile and / or the second profile comprises a round profile.

[0085] According to one option of the invention, the first profile and the second profile comprise different profiles, preferably, the first profile has a linear mass greater than that of the second profile.

[0086] Figure 4 shows a cross-section of the reinforcing piece 34 in the angled recess 32 of the motor vehicle structure, according to an embodiment of the invention. The motor vehicle may correspond to the one shown in relation to one of Figures 1 to 3. The present cross-section passes through the central longitudinal member 22. However, these features also apply to the front pillar and the second profile.

[0087] Inside the angled recess 32, the structure includes at least one retaining plate 50 for the reinforcing piece 34. According to one embodiment, the structure includes a plurality of retaining plates distributed along the reinforcing piece 34, therefore distributed along the contour of the angled recess 32. The retaining plate 50 forms a support. It extends transversely.

[0088] The central spar 22 comprises an inner shell 52 with an internal cavity 54 and an outer shell 56 with an external cavity 58. The retaining plate 50 connects the inner shell 52 to the outer shell 56. The outer shell 56 further has an internal surface 60 delimiting the external cavity 58. The internal surface 60 is opposite and separated from the reinforcing piece 34. The meeting of the internal cavity 54 and the external cavity 58 forms the angled recess 32. The inner shell 52 and the outer shell 56 are fixed to each other at the level of the rebates 70; after the assembly of the reinforcing piece 34. The rebates 70 are vertical. They include weld points. The reinforcing piece 34 is vertically spaced away from the rebates 70.

[0089] The first profile 36 is fixed to the inner shell 52. The first profile 36 extends into the inner cavity 54 and into the outer cavity 58. The reinforcing piece 34 is transversely spaced away from the inner surface 60. The first profile 36 has a transverse width of between 5 cm and 12 cm.

[0090] Similarly, the second profile has, transversely, an internal part and an external part; between which the second profile is fixed.

[0091] The first profile 36 and / or the second profile each include a stiffening strip 62. The stiffening strip 62 forms an internal reinforcement. The stiffening strip 62 is an internal stiffening core. The first profile 36 and / or the second profile is a tube with an internal stiffening core. The stiffening strip 62 extends vertically. It compartmentalizes the interior of the first profile 36. Its presence improves the behavior of the reinforcing piece 34 during a collision.

[0092] The inner shell 52 includes an internal vertical partition 64. The outer shell 56 includes an external vertical partition 66. The first profile 36 is fixed to the internal vertical partition 64, for example by welding. The first profile 36 remains transversely at a distance from the external vertical partition 66. This feature limits mechanical stresses and accommodates geometric variations.

[0093] The reinforcement piece 34 includes a partition thickness greater than a sheet thickness of the central longitudinal member 22. It includes a partition thickness greater than the thickness of the internal vertical partition 64 and greater than the external vertical partition 66.

[0094] According to an alternative of the invention, the stiffening strip extends horizontally.

[0095] According to an alternative of the invention, the reinforcing piece extends to the inner surface.

[0096] According to one option of the invention, the first profile and / or the second profile comprises two stiffening bands, for example arranged in a cross.

[0097] Figure 5 shows a diagram of a method for manufacturing a motor vehicle, according to one embodiment of the invention. The motor vehicle may correspond to the one shown in relation to one of Figures 1 to 4.

[0098] The manufacturing process comprises the following steps, in particular carried out in the following order:

[0099] a) embodiment 100 of an assembly comprising an internal shell of central spar and an internal part of front pillar extending vertically from the internal shell;

[0100] b) fixing 102 of a first aluminium profile to a second aluminium profile in order to form a reinforcing piece,

[0101] c) installation 104 and fixing of the reinforcement piece by positioning the first profile in the inner shell and positioning the second profile in the inner part;

[0102] d) assembly 106 of an outer shell of central spar on the inner shell, and of an outer part of front pillar to the inner part in order to cover the reinforcing piece.

[0103] Step a) fabrication 100 includes cutting, stamping, and welding sheet metal to form the inner shell and the internal part. The angled recess is then opened. The assembly is an intermediate assembly.

[0104] Step b) fastening 102 includes a welding step. According to one option, the invention includes a preliminary step of bending profiles. Even further prior, each aluminum profile is produced by cold drawing.

[0105] Step c) setup 104 includes welding, gluing, or clinching the reinforcement piece to the inner shell and the inner part.

[0106] Step d) assembly 106 comprises welding an outer shell to the inner shell, and welding an outer part to the inner part. This closes the angled recess. The reinforcing piece is then enclosed.

[0107] The invention comprises the combination of all the embodiments illustrated by all the figures.

[0108] Figures 2 and 3 are isometric views. They each respect a specific scale, real angles and real proportions.

Claims

Demands

1. Structure (12) of a motor vehicle (10), the structure (12) comprising a passenger compartment (14), a central steel longitudinal member (22) extending along the passenger compartment (14), a steel front pillar (24) in front of the passenger compartment (14); an angled recess (32) extending in the central longitudinal member (22) and in the front pillar (24); a reinforcing piece (34) in the angled recess (32); characterized in that the reinforcing piece (34) comprises a first aluminum profile (36) extending in the central longitudinal member (22), a second aluminum profile (38) extending in the front pillar (24) and attached to the first profile (36).

2. Structure (12) according to claim 1, characterized in that the reinforcing piece (34) comprises a reinforcing bracket (46) fixed to the first profile (36) and to the second profile (38); preferably, the reinforcing bracket (46) comprises two reinforcing wings (68) and a plate connecting the reinforcing wings (68).

3. Structure (12) according to any one of claims 1 to 2, characterized in that the first profile (36) and the second profile (38) each comprise a closed profile; preferably, the first profile (36) and / or the second profile (38) is a rectangular section profile.

4. Structure (12) according to any one of claims 1 to 3, characterized in that the second profile (38) is inclined relative to the first profile (36) by an angle of inclination (44) between 91° and 100°; preferably between 92° and 95°.

5. Structure (12) according to any one of claims 1 to 4, characterized in that the first profile (36) and the second profile (38) are fixed by welding; the first profile (36) and the second profile (38) are fixed by a weld bead (48) surrounding the first profile (36) and / or the second profile (38).

6. Structure (12) according to any one of claims 1 to 5, characterized in that in the bent recess (32), the structure (12) comprises at least one retaining plate (50) for the reinforcing piece (34); and / or the first profile (36) comprises a stiffening strip (62); the stiffening strip (62) extending vertically.

7. Structure (12) according to any one of claims 1 to 6, characterized in that the central spar (22) comprises an inner shell (52) with an internal cavity (54) and an outer shell (56) with a cavity external (58) and an internal surface (60), the first profile (36) being fixed to the internal shell (52); preferably, the first profile (36) extends into the internal cavity (54) and into the external cavity (58), and is at a distance from the internal surface (60).

8. Structure (12) according to any one of claims 1 to 7, characterized in that the structure (12) has a front partition (40) delimiting a front wheel arch (18), and a rear partition (42) delimiting a rear wheel arch (20); the first profile (36) extending longitudinally to the rear partition (42), and the second profile (38) extending longitudinally to the front partition (40).

9. Motor vehicle (10) comprising a structure (12); characterized in that the structure (12) conforms to any one of claims 1 to 8; preferably, the structure (12) comprises a front apron (26) with a first height, the second profile (38) comprising a second height greater than or equal to the first height.

10. Method of manufacturing a motor vehicle (10) structure (12) comprising a passenger compartment (14), a central steel longitudinal member (22) extending along the passenger compartment (14), a front pillar (24) made of steel and in front of the passenger compartment (14); the manufacturing method comprising the following steps: • a) fabrication (100) of an assembly comprising an inner shell (52) of the central longitudinal member (22) and an inner portion of the front pillar (24) extending vertically from the inner shell (52); characterized in that the manufacturing process further comprises the steps: • b) fixing (102) of a first aluminium profile (36) to a second aluminium profile (38) in order to form a reinforcing piece (34), • c) positioning (104) and fixing of the reinforcing piece (34) by positioning the first profile (36) in the inner shell (52) and by positioning the second profile (38) in the inner part;• d) assembly (106) of an outer shell (56) of a central spar (22) on the inner shell (52), and of a; external part of front pillar (24) to the internal part in order to cover the reinforcement piece (34).

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