Motor vehicle structure

Abstract

The invention proposes a rear structure for a motor vehicle, the rear structure comprising a floor with a horizontal panel (38) and a foreground (40); the horizontal panel has a plurality of nested loops (42); each loop is defined by an alternation of stiffening ribs (44) extending along said loop and planar separations (46), the planar separations delimiting the stiffening ribs and being vertically aligned with the foreground; in each loop, along said loop (42), the stiffening ribs (44) comprise first lengths that form a first set of lengths, the planar separations (46) comprise second lengths that form a second set of lengths. At least one of the loops exhibits length heterogeneity among at least one of the first set of lengths and the second set of lengths. Figure to be published with the abstract: Figure 3

Description

Title of the invention: Motor vehicle structure

[0001] The invention relates to the propagation of a shock wave during a collision with a motor vehicle. The invention relates to a motor vehicle structure with a panel filtering an energy peak during a collision. The invention provides a rear structure for a motor vehicle. The invention also relates to a motor vehicle.

[0002] In a low overlap rear collision, the rear structure of a motor vehicle deforms under the effect of the impact energy. In detail, its energy-absorbing box, which is between a rear cross member and a rear side member, deforms, dissipating energy. For example, in an impact at 16 km / h, the deformation of the energy-absorbing box allows the deformations to be concentrated there, and the rest of the vehicle to be preserved. The impact suffered by the occupants of the passenger compartment is reduced; which contributes to safety.

[0003] A motor vehicle has a plurality of panels forming different floors. These panels; although protected by the shock absorber boxes; deform when they are crossed by the shock wave passing through the rear side members. This phenomenon is particularly observed during an impact with a 50% overlap, and an incidence of 10° between the motor vehicles. Therefore, the panels must be replaced when the motor vehicle is repaired. This replacement operation increases the repair costs since it requires a number of disassembly and reassembly steps.

[0004] A structural panel is known under a loading space, said structural panel having stiffening ribs arranged in a star shape around the center of said panel. Such a panel improves the overall rigidity. However, it remains subject to plastic deformations caused by the propagation of shock waves.

[0005] Document US10272954B2 discloses a motor vehicle comprising a panel with circular arc stampings. The panel comprises: a load point to which a load is applied from the outside; and a projection which projects from a surface of the panel and is formed continuously or discontinuously around the load point. The projection intersects, at a plurality of positions, each of a plurality of virtual straight lines extending radially from the load point. The floor has a plurality of concentric circles, each arc being materialized by a pair of opposing ribs. The ribs of the successive circles are offset by 90°. The panel forms a floor of the motor vehicle. However, during a rear collision such a panel is likely to deform plastically due to the shock wave passing through it.

[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 ability of a horizontal panel of a rear structure of a motor vehicle to resist, preferably to absorb, a shock wave during a collision. The invention also aims to optimize the filtration of a shock wave and the rigidity of a floor of a motor vehicle structure.

[0007] According to a first aspect, the invention provides a rear structure of a motor vehicle, the rear structure comprising a floor with a horizontal panel, a first plane; the horizontal panel has a plurality of nested loops; each loop is defined by an alternation of stiffening ribs extending along said loop and planar separations, the planar separations delimiting the stiffening ribs and being vertically at the level of the first plane; in each loop, along said loop, the stiffening ribs comprise first lengths which form a first set of lengths, the planar separations comprise second lengths which form a second set of lengths; remarkable in that at least one of the loops has a heterogeneity of lengths among at least one of the first set of lengths and the second set of lengths.

[0008] Generally, the invention provides a discontinuous loop with heterogeneity among the ribs and / or separations. The invention embodies a damping and / or filtering system which divides the shock wave in order to attenuate its amplitude and spread its circulation over time. This reduces the effect of energy peaks which reach a weak point at a given instant.

[0009] Document CN210258273U presents a car trunk mat. It does not provide any solution specific to a structural floor.

[0010] Preferably, in said at least one loop, the first lengths comprise at least two different first lengths, and the second lengths comprise at least two different second lengths.

[0011] Preferably, the first lengths comprise at least three different first lengths, and the second lengths comprise at least three different second lengths.

[0012] Preferably, the horizontal panel has flat rings interposed between the loops, the flat separations being vertically at the level of said flat rings.

[0013] Preferably, one half of the loops has the heterogeneity of lengths among at least one of the first set of lengths and the second set of lengths of each of the loops of the half.

[0014] Preferably, in said at least one loop, the first lengths are greater than the second lengths.

[0015] Preferably, the loops comprise concentric circles, said concentric circles having radial gaps between the concentric circles, the radial gaps comprising at least two different radial gaps; preferably, the first lengths are first angular lengths, and the second lengths are second angular lengths.

[0016] Preferably, each stiffening rib comprises a profile, said profile having a height and a width greater than the height.

[0017] Preferably, the profile comprises side walls inclined relative to a vertical direction by an angle of inclination of between 70° and 80°; preferably, the profile comprises a radius of curvature of between 3 mm and 10 mm.

[0018] Preferably, the horizontal panel comprises a center, the loops comprise two successive loops whose stiffening ribs are angularly offset around said center.

[0019] Preferably, the flat separations are arranged in a staggered pattern.

[0020] Preferably, the horizontal panel forms a loading floor; and / or a seating floor.

[0021] Preferably, the seat floor comprises a longitudinal opening passing through said at least one loop.

[0022] Preferably, at least one or each loop is discontinuous.

[0023] Preferably, the loops are concentric and / or comprise different radii.

[0024] Preferably, the heterogeneity is configured to filter and / or dampen a shock wave during a longitudinal collision against the rear of the motor vehicle.

[0025] Preferably, the foreground is a main plane or a medium plane.

[0026] Preferably, each loop is at least partially formed on the horizontal panel.

[0027] Preferably, at least one or each alternation is symmetrical.

[0028] Preferably, the loops comprise at least three loops, or at least six loops.

[0029] Preferably, at least one or each loop is cut.

[0030] Preferably, the stiffening ribs are arched.

[0031] Preferably, the profile is along said loop.

[0032] Preferably, the stiffening ribs of said at least one loop comprise at least two stiffening ribs with first lengths different from each other.

[0033] According to another aspect, the invention provides a rear structure of a motor vehicle, the rear structure comprising a floor with a horizontal panel, a first plane; the horizontal panel has a plurality of nested loops; each loop comprising alternating stiffening ribs extending along the associated loop and planar separations, the planar separations delimiting the stiffening ribs and being vertically at the level of the first plane; remarkable in that the stiffening ribs of at least one of the loops have different lengths along said loop. This rear structure reduces the amplitude of a shock wave as it passes through the horizontal panel.

[0034] According to another aspect, the invention proposes a rear structure of a motor vehicle, the rear structure comprising a floor with a horizontal panel, a first plane; the horizontal panel has a plurality of concentric loops; each loop comprising an alternation of stiffening ribs extending along the associated loop and planar separations, the planar separations delimiting the stiffening ribs and being vertically at the level of the first plane; remarkable in that the planar separations of at least one of the loops have different lengths along said loop. Such a rear structure makes it possible to attenuate a shock wave passing through the horizontal panel.

[0035] According to another aspect, the invention provides a motor vehicle comprising a rear structure; remarkable in that the rear structure is in accordance with the invention, the rear structure comprising rear side members vertically at the level of the horizontal panel.

[0036] Preferably, the motor vehicle comprises a bumper system vertically at the level of said one or less loop.

[0037] Each characteristic introduced by the expression “preferably” given in relation to one of the aspects of the invention applies to all the other aspects of the invention.

[0038] The invention will be well understood and other aspects and advantages will appear clearly on reading the description which follows, given with reference to the figures appended and listed below.

[0039] [Fig.l] is a side view of a motor vehicle according to the invention.

[0040] [Fig.2] is a view from below of a rear structure of a motor vehicle according to the invention, as deformed during a rear-end collision.

[0041] [Fig. 3] is a plan view of a horizontal panel of a rear structure of a motor vehicle according to the invention.

[0042] [Fig. 4] is a plan view of a horizontal panel of a rear structure of a motor vehicle according to the invention.

[0043] [Fig. 5] is a section of a stiffening rib of a horizontal panel of the rear structure of a motor vehicle according to the invention.

[0044] In the following description, the term “understand” is synonymous with “include” and is not limiting in that it allows the presence of other elements in the vehicle. automobile or the rear structure to which it relates. It is understood that the term "include" includes the terms "consist of". The terms "external" and "internal" will refer respectively to that which is oriented towards the outside of the vehicle and towards the inside of the vehicle.

[0045] In the present description, the term "longitudinal", the term "longitudinally", the term "transverse", and the term "transversely" are used according to the reference frame of the vehicle, in the mounting configuration. The term "longitudinal" corresponds to the main direction of movement of the vehicle. The term "transverse" corresponds to a direction perpendicular to the main direction of movement of the vehicle. The term "front" refers to the main direction of movement of the vehicle. The term "rear" designates the opposite of the front of the vehicle.

[0046] 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 direct trihedron whose orientation is preserved throughout the figures.

[0047] In the present description, the ranges of values ​​include the limits which delimit them.

[0048] In the present description, the term "vertical", the term "longitudinal" and the term "horizontal" are not to be understood in the strict sense of the term. Indeed, they allow an inclination of at most 20°, preferably at most 10°, more preferably at most 5°, even more preferably at most 2°; compared to the strict sense of these terms.

[0049] In the present description, the term “loop” is understood as a ring or a turn, closed or open.

[0050] In the present description, the technical characteristics are defined in the mounting configuration of the rear structure, unless explicitly mentioned otherwise.

[0051] Throughout the description, the different figures use the same reference signs to designate identical or similar entities.

[0052] [Fig.l] represents a motor vehicle 10 according to the invention. The motor vehicle 10 comprises energy storage means and at least one motor (not shown) adapted to drive said motor vehicle 10.

[0053] The motor vehicle 10 comprises a structure 12. The structure 12 forms an outer body, or even a main frame of the motor vehicle. The structure 12 delimits different compartments of the motor vehicle 10, including the passenger compartment 14, a rear loading space 16 also called a loading trunk. The structure 12 can be formed from an assembly of stamped sheets welded to each other.

[0054] The structure 12 connects different parts of the motor vehicle 10 including the openings. The structure 12 forms a mounting support for the powertrain, the suspension systems, the steering system, the braking systems. A bumper system 18 is attached to the rear. The bumper system 18 comprises a bumper skin and shock absorbers. In the event of a rear collision, the bumper system 18 absorbs the energy of the impact and dissipates it. It preserves the motor vehicle, and thereby contributes to safety.

[0055] The structure 12 comprises a rear structure 20. The rear structure 20 forms a mounting support for the bumper system 18. In particular, it delimits the rear loading space 16. The rear structure 20 comprises at least one floor 22. Each floor 22 forms a horizontal support. Each floor 22 extends transversely across the width of the passenger compartment 14 or the rear loading space 16. The at least one floor 22 comprises a loading floor 24 and / or a seating floor 26. The seating floor 26 is intended to receive seats (not shown) and is in front of the loading floor 24. It is in the passenger compartment 14. The loading floor 24 is in the extension of the seating floor 26.

[0056] The motor vehicle may, for example, be a private motor vehicle or a utility motor vehicle.

[0057] [Fig. 2] shows the scenario of a collision between a motor vehicle with a rear structure 20 and a third-party vehicle 28 (partially shown). The motor vehicle may correspond to that shown in relation to [Fig. 1]. The rear structure 20 is seen from below. The rear axle is not shown for the sake of clarity.

[0058] The rear structure 20 has rear side members 30; also called “side members”. The rear side members 30 extend to the rear end of the rear structure 20. They form the underbody of the motor vehicle. They delimit wheel arches and are connected by a transverse beam 32. At the front, the rear side members 30 are also connected to the central side members.

[0059] At the rear end, the rear side members 30 receive the bumper system 18, including absorber boxes 34 and a cross member 36 connected to the absorber boxes 34. The absorber box 34 on the impact side is crushed longitudinally. It dissipates kinetic energy of the third-party vehicle 28.

[0060] The loading floor 24 transversely connects the rear side members 30. The loading floor 24 extends longitudinally along the length of the rear side members 30. The loading floor 24 is vertically at the level of the bumper system 18 so that the energy of the collision passes through it.

[0061] The seating floor 26 is in front of the rear side members 30. The transverse beam 32 separates it from the loading floor 24. During the collision, part of the wave of shock propagates there via the rear side member 30.

[0062] Each floor 22 comprises a horizontal panel 38. The horizontal panel 38 forms a plate. It comprises in particular a stamped sheet metal. The horizontal panel 38 extends transversely over at least half the width of the rear structure 20. The horizontal panel 38 comprises steel or an aluminum alloy. Other alloys are envisaged in order to optimize the rigidity and the damping of the shock wave.

[0063] According to one option of the invention, the loading floor and the seating floor are formed from the same horizontal panel.

[0064] [Fig. 3] shows a horizontal panel 38 forming a seating floor 26 for the rear structure of a motor vehicle. The motor vehicle may correspond to that shown in relation to one of Figures 1 to 2.

[0065] The horizontal panel 38 is generally rectangular, and substantially trapezoidal. It materializes the first plane 40 of the seating floor 26. The first plane 40 may be a main plane or a mid-plane depending on the thickness of the horizontal panel 38. The horizontal panel 38 has a plurality of loops 42. The loops 42 are nested within each other. They have different radii. They are optionally concentric. Their centers may be substantially offset from each other in order to improve the cushioning of the horizontal panel 38.

[0066] Each loop 42 is materialized by stiffening ribs 44. Each loop 42 is discontinuous. At least one of the loops is inscribed in the horizontal panel 38, another loop 42 protrudes from said horizontal panel 38. Each loop 42 is defined by its stiffening ribs 44. Each stiffening rib has a main elongation along the outline of the corresponding loop 42. It forms a stiffening profile. Each stiffening rib 44 is offset vertically relative to the first plane 40. The stiffening ribs 44 each have an elongation along the corresponding loop 42. They describe a continuous line, for example with a constant radius or a constantly increasing radius. The stiffening ribs 44 are bent, preferably arched. They are in elevation relative to the first plane 40.

[0067] Each loop 42 also has planar separations 46. The planar separations 46 are generally at the level of the first plane 40. They are coplanar. They describe a mesh. Each loop 42, in particular its stiffening ribs 44 and its planar separations 46 are vertically at the level of the rear side members 30 (partially shown).

[0068] In at least one or in each loop 42 the stiffening ribs 44 and the planar separations 46 are placed alternately along the corresponding loop 42. The stiffening ribs 44 and the planar separations 46 are arranged one after the other along the corresponding loop 42. The flat separations 46 delimit the stiffening ribs 44; and vice versa.

[0069] The horizontal panel 38 also has flat rings 48 between the loops 42. The flat separations 46 are at the level of the flat rings 48, the stiffening ribs 44 are raised in relation to the flat rings 48. The flat rings 48 form discs, or rings. They are closed rings. The flat rings 48 radially separate the loops 42, and in particular the stiffening ribs 44 which they comprise. The flat separations 46 connect the flat rings 48. The flat rings 48 and the flat separations 46 form a flat network crossing the horizontal panel 38. The flat separations 46 are arranged in a staggered pattern.

[0070] In each loop 42, along said loop 42, the stiffening ribs 44 comprise first lengths which form a first set of lengths and the planar separations 46 comprise second lengths which form a second set of lengths. At least one, or each loop 42 has a heterogeneity of lengths among at least one of the first set of lengths and the second set of lengths.

[0071] Thus, the loop 42 has geometric heterogeneity. The stiffening ribs 44 form obstacles of different sizes which oppose a shock wave during a collision. Similarly, the planar separations 46 form passages of different sizes for the propagation of the shock wave. Thus, during the propagation of the shock wave, the latter divides into sub-waves with different amplitudes and preferably with a phase shift. This configuration avoids maintaining the same coherent wave amplitude which would include a temporal peak of energy which would be likely to deform the horizontal panel 38. Thus, the invention forms a filter damping the shock wave which reduces its harmful nature.

[0072] For example, at least one of the loops 42 has a first length different from the other first lengths of the first set of lengths. This loop 42 has a second length different from the other second lengths of the second set of lengths.

[0073] At least one half of the loops 42 has a heterogeneity of lengths within the first set of lengths and / or within the second set of lengths. In this case, the horizontal panel 38 has six loops 42. At least three loops 42 show said heterogeneity of lengths.

[0074] In the loop 42 having the heterogeneity of lengths, the first lengths comprise two different first lengths, and the second lengths comprise two different second lengths. Preferably, the first lengths comprise at least three first lengths different from each other, and the second lengths comprise at least three second lengths. different from each other.

[0075] The loops 42 comprise concentric circles. The loops 42 comprise a center 50. From the center 50, the circles have a constant increase in radii relative to each other. The first lengths are first angular lengths, and the second lengths are second angular lengths. The loops 42 comprise two successive loops 42 whose stiffening ribs 44 are angularly offset relative to the center 50. The staggered arrangement of the stiffening ribs 44 and the planar separations 46 slows the propagation of the shock wave since it lengthens the distance to be traveled to reach the center. This improves the shock-absorbing character.

[0076] The stiffening ribs 44 of each loop 42 having the heterogeneity of lengths comprise at least two stiffening ribs 44 with different first lengths. Preferably, the first lengths are greater than the second lengths.

[0077] The seating floor 26 comprises a longitudinal opening 52. The longitudinal opening 52 passes vertically through the horizontal panel 38. The longitudinal opening 52 passes through said at least one loop 42 having heterogeneity of lengths, preferably several loops 42.

[0078] The loops 42 are symmetrical along a sagittal plane. The alternations have a left half and a right half. In each half, the planar separations 46 have second lengths that are all different and / or the stiffening ribs 44 have first lengths that are all different. This aspect improves the control of the propagation of a shock wave caused by a collision.

[0079] [Fig. 4] shows a horizontal panel 38 forming a loading floor 24 for the rear structure of a motor vehicle. The motor vehicle may correspond to that shown in relation to one of Figures 1 to 3. The horizontal panel 38 is substantially identical to that shown in relation to [Fig. 3]. The characteristics described in relation to [Fig. 3] apply to the horizontal panel 38 of [Fig. 4]; unless explicitly stated otherwise.

[0080] The horizontal panel 38 of the loading floor 24 materializes the first plane 40 of the loading floor 24. The horizontal panel 38 has a plurality of loops 42. At least one or each loop 42 is defined by an alternation of stiffening ribs 44 extending along said loop 42, and planar separations 46. The planar separations 46 delimit the stiffening ribs 44 and are vertically at the level of the first plane 40. The stiffening ribs 44 are stiffening segments.

[0081] In each loop 42; along said loop, that is to say following its path; the stiffening ribs 44 comprise first lengths which form a first set of lengths, the planar separations 46 comprise second lengths which form a second set of lengths. Each or at least one of the loops 42 has a heterogeneity of lengths among at least one of the first set of lengths and the second set of lengths.

[0082] The invention installs on the rear seat floor a complex network of stiffening ribs 44. This network of stiffening ribs 44 is accompanied by a no less complex network of flat separations 46. The arrangement of the stiffening ribs 44 makes it possible to filter the amplitude of the vibrations of the seat floor caused by the shock wave and to avoid plastic deformations of the horizontal panel 38.

[0083] The different rib loops form a filtering system that deflects and further distributes the shock wave. Thus, the primary wave gradually attenuates towards the center. As the shock wave passes through the different loops, different proportions of waves pass through them via paths of different lengths. Each sub-wave has less energy, and the path variations modulate the damping in addition to causing a phase shift.

[0084] Five loops 42 are separated by four planar rings 48, separating them from each other. However, any other number of loops may be selected. The first lengths are first angular lengths, and the second lengths are second angular lengths. The angular lengths are measured around the center 50.

[0085] The loops 42 (shown in dotted line) comprise concentric circles around the center 50. The concentric circles have a constant increase in radii from the center 50. The concentric circles have radial spacings 54 between them. The radial spacings 54 comprise at least two different radial spacings 54. For example, the three loops 42 closest to the center 50 are spaced apart by a radial spacing 54 greater than the radial spacing 54 between the third circle, the fourth circle and the fifth circle. The radial spacings 54 are differences in radius between two successive circles. Their central extension reaches the center 50.

[0086] Generally, the center is a focus.

[0087] According to an alternative of the invention, the loops are ellipsoidal.

[0088] According to an alternative of the invention, the loops describe a spiral.

[0089] According to an alternative of the invention, the loops are rectangular; preferably square. According to this alternative, the stiffening ribs are straight, or square.

[0090] [Fig. 5] shows a section of a stiffening rib 44 of a loop of a rear structure of a motor vehicle. The motor vehicle may correspond to that presented in relation to one of Figures 1 to 4.

[0091] The stiffening rib 44 is bordered by two flat rings 48. Each stiffening rib 44 comprises a profile 56. The profile 56 corresponds to a slice taken perpendicular to the outline of the loop associated with the stiffening rib 44. The profile 56 is essentially hollow. It has a depth greater than the thickness of the sheet metal of the horizontal panel 38. The profile 56 has a height 58 and a width 60 greater than the height 58. The width 60 is an average width. It is at least twice greater than the height 58. The height 58 is perpendicular to the first plane 40. For example, the height 58 is between 5 mm and 20 mm, preferably between 8 mm and 15 mm. For example, the width 60 is between 15 mm and 60 mm, preferably between 25 mm and 40 mm.

[0092] The profile 56 generally has a shape of the letter “U”. The profile 56 comprises side walls 62. The side walls 62 are connected by a horizontal wall 64. The horizontal wall 64 forms a junction wall. The side walls 62 are inclined relative to a vertical direction by an angle of inclination 66 of between 70° and 80°.

[0093] The profile 56 comprises one or more radii of curvature 68. Each radius of curvature 68 is connected to one of the side walls 62 on one side, and to the horizontal wall 64 or to a planar ring 48 on the other side. At least one or each radius of curvature 68 is between 3 mm and 10 mm; preferably between 4 mm and 6 mm.

[0094] Each parameter of this profile geometry optimizes rigidity, compactness, and shock wave damping.

[0095] The invention comprises the combination of all the embodiments illustrated by all the figures.

[0096] Figures 2 to 4 are isometric views. They each respect a specific scale, real angles and real proportions.

Claims

Claims

1. Rear structure (20) of a motor vehicle (10), the rear structure (20) comprising a floor (22) with a horizontal panel (38), a first plane (40); the horizontal panel (38) has a plurality of nested loops (42); each loop (42) is defined by alternating stiffening ribs (44) extending along said loop (42) and planar separations (46), the planar separations (46) delimiting the stiffening ribs (44) and being vertically at the first plane (40); in each loop (42), along said loop (42), the stiffening ribs (44) comprise first lengths which form a first set of lengths, the planar separations (46) comprise second lengths which form a second set of lengths; characterized in that at least one of the loops (42) has a heterogeneity of lengths among at least one of the first set of lengths and the second set of lengths.

2. Rear structure (20) according to claim 1, characterized in that in said at least one loop (42), the first lengths comprise at least two different first lengths, and the second lengths comprise at least two different second lengths; preferably, the first lengths comprise at least three different first lengths, and the second lengths comprise at least three different second lengths.

3. Rear structure (20) according to one of claims 1 to 2, characterized in that the horizontal panel (38) has flat rings (48) interposed between the loops (42), the flat separations (46) being vertically at the level of said flat rings (48).

4. Rear structure (20) according to one of claims 1 to 3, characterized in that one half of the loops (42) has the heterogeneity of lengths among at least one of the first set of lengths and the second set of lengths of each of the loops (42) of the half; preferably, in said at least one loop (42), the first lengths are greater than the second lengths.

5. Rear structure (20) according to one of claims 1 to 4, characterized in that the loops (42) comprise concentric circles, said concentric circles having radial gaps (54) between the concentric circles, the radial gaps (54) comprising at least two different radial gaps (54); preferably, the first lengths are first angular lengths, and the second lengths are second angular lengths.

6. Rear structure (20) according to one of claims 1 to 5, characterized in that each stiffening rib (44) comprises a profile (56), said profile (56) having a height (58) and a width (60) greater than the height (58).

7. Rear structure (20) according to claim 6, characterized in that the profile (56) comprises side walls (62) inclined relative to a vertical direction by an angle of inclination (66) of between 70° and 80°; preferably, the profile (56) comprises a radius of curvature (68) of between 3 mm and 10 mm.

8. Rear structure (20) according to one of claims 1 to 7, characterized in that the horizontal panel (38) comprises a center (50), the loops (42) comprise two successive loops (42) whose stiffening ribs (44) are angularly offset around said center (50); preferably, the flat separations (46) are arranged in a staggered pattern.

9. Rear structure (20) according to one of claims 1 to 8, characterized in that the horizontal panel (38) forms a loading floor (24); and / or a seating floor (26), preferably, the seating floor (26) comprises a longitudinal opening (52) passing through said at least one loop (42).

10. Motor vehicle (10) comprising a rear structure (20); characterized in that the rear structure (20) is in accordance with one of claims 1 to 9, the rear structure (20) comprising rear side members (30) vertically at the level of the horizontal panel (38); preferably the motor vehicle (10) comprises a bumper system (18) vertically at the level of said or at least one loop (42).

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