Reinforced floor for automotive vehicle structure

Abstract

The invention relates to a motor vehicle structure (12). The structure (12) comprises a passenger compartment; a floor plate (16) under the passenger compartment, said floor plate comprising a first stiffening bulge (36) extending longitudinally; a cross member, such as a heel board, with a longitudinal mounting flange (52) at the level of the first stiffening bulge; a longitudinal stiffener along the first stiffening bulge (36). The longitudinal stiffener comprises a front section (40) fixed to the floor plate (16) and comprising at least one front bulge (42); a rear section (44) with a rear bulge (46) that is different from the at least one front bulge (42), and that extends along the first stiffening bulge and the mounting flange (52). The longitudinal stiffener is aligned with a child seat support leg. Figure to be published with the abstract: Figure 4

Description

Title of the invention: Reinforced floor for motor vehicle structure

[0001] The invention relates to the reinforcement of a motor vehicle structure. The invention concerns an adaptation of a motor vehicle floor to a child seat support leg. The invention relates to a motor vehicle structure. The invention also relates to a motor vehicle.

[0002] A motor vehicle has a mechanical structure. This structure connects the various components of the vehicle and supports the finishing equipment. Thus, it is connected to the suspension and steering systems, and supports the motor and the electric battery in the case of an electrically driven vehicle. Furthermore, it forms a mounting support for the seats installed in the passenger compartment.

[0003] The structure forms a body, a shell, generally extending over the entire length and width of the vehicle. It comprises an assembly of stamped and then welded sheet metal. Some sheets form flat surfaces representing a floor or bodywork surface, while other sheets are shaped to create profiles. These profiles are then used as longitudinal members, cross members, or posts. Another type of sheet metal is used to create reinforcements that provide increased rigidity in a predefined area. These reinforcements address specific mechanical constraints, for example, localized loads.

[0004] Furthermore, the structure as a whole must meet safety criteria. In the event of a collision, it must both absorb the impact energy while promoting a deformation kinematic that avoids the generation of hard points and the risk of intrusion into the passenger compartment.

[0005] Document CN115257964A describes a motor vehicle comprising a reinforced front floor assembly. A first reinforcement assembly comprises two reinforcing beams connected in a staggered arrangement. The seat crossmember assembly comprises a front crossmember and a rear crossmember, which are removably arranged on the floor panel. The front and rear crossmembers are arranged parallel to each other at intervals along the length of the floor panel. At least one reinforcing beam is connected to the rear seat crossmember. This front floor assembly improves vehicle safety. Vibration transmission is reduced, stability is ensured, and passenger comfort is improved.

[0006] Document CN218505994U shows a vehicle body rear floor structure and a vehicle. The floor structure consists of a rear floor box, a battery pack mounting frame, and a frame of Rear floor reinforcement. The rear floor liner has a mounting area for a battery pack. The battery pack mounting frame is fixed above the rear floor liner and has a battery pack attachment point. The rear floor reinforcement frame is fixed below the rear floor liner, and the front and rear ends of the rear floor center longitudinal beam, the rear floor left longitudinal beam, and the rear floor right longitudinal beam are connected to the front of the rear floor. The battery pack mounting frame improves the rigidity of the rear floor liner and provides reliable support for the battery pack as its attachment point. The risk of fire caused by battery pack extrusion is reduced.

[0007] In order to benefit from economies of scale across a range of motor vehicle models, it is advantageous to use the same floor panel on different models. However, some models have different wheelbases. Therefore, a stiffener design can only be used on a single motor vehicle model. Consequently, there is a need for modularity in floor stiffeners.

[0008] The invention aims to address at least one of the problems or drawbacks encountered in the prior art. In particular, the invention aims to provide a modular motor vehicle structure. The invention also aims to optimize the rigidity, modularity, assembly, and safety characteristics of a motor vehicle floor.

[0009] According to a first aspect, the invention proposes a motor vehicle structure, the structure comprising a passenger compartment; a floor plate under the passenger compartment, said floor plate comprising a first stiffening bulge extending longitudinally; a cross member with a longitudinal fixing flange at the level of the first stiffening bulge; a longitudinal stiffener along the first stiffening bulge; notable in that the longitudinal stiffener comprises a front section fixed to the floor plate and comprising at least one front bulge; a rear section with a rear bulge which is different from the at least one front bulge, and which extends along the first stiffening bulge and the fixing flange.

[0010] The configuration of the longitudinal stiffener allows it to reinforce the first stiffening boss at the location of the mounting flange, thanks to a dedicated boss. Thus, the invention provides modularity. This result is achieved while optimizing rigidity and ease of assembly.

[0011] Preferably, the first stiffening boss includes a front end along the rear boss.

[0012] Preferably, the rear section is vertically between the fixing flange and the floor plate.

[0013] Preferably, at least one front boss is higher than the rear boss.

[0014] Preferably, the rear boss is wider than the first boss of stiffening.

[0015] Preferably, the rear boss is wider than each front boss.

[0016] Preferably, the front boss includes a front apex, the rear boss includes a rear apex below the front apex.

[0017] Preferably, the rear top is fixed to the fixing flange.

[0018] Preferably, the floor plate comprises two second stiffening bosses, a flat area between the second bosses and in front of the first stiffening boss, the front section being fixed to said flat area; preferably, the first stiffening boss comprises a first height, the second stiffening bosses comprise a second height greater than the first height.

[0019] Preferably, the longitudinal stiffener includes a connecting ramp which longitudinally connects at least one front boss to the rear boss and which is inclined relative to the floor plate.

[0020] Preferably, at least one front boss includes a first internal volume, and the rear boss includes a second internal volume which is greater than the first internal volume.

[0021] Preferably, the at least one front boss comprises two front bosses, and the longitudinal stiffener comprises a longitudinal groove between the two front bosses.

[0022] Preferably, the rear boss, the first stiffening boss and the fixing flange form a stack.

[0023] Preferably, the stack is fixed by a three-layer weld point.

[0024] Preferably, the rear section comprises a front half and a half At the rear, the crossmember's fixing bracket is attached to the rear half or the front half.

[0025] Preferably, the longitudinal stiffener is thicker than the floor plate.

[0026] Preferably, the first stiffening boss is continuous.

[0027] Preferably, the front end is in the rear boss.

[0028] Preferably, at least one front boss is longer than the rear boss.

[0029] Preferably, the front section is fixed to the flat area.

[0030] Preferably, the front section is in front of the front end.

[0031] Preferably, the rear section is fixed to the fixing flange.

[0032] Preferably, the rear section comprises a length greater than or equal to 5 cm.

[0033] Preferably, the rear section comprises a length greater than or equal to 12 cm.

[0034] Preferably, the rear section is vertically opposite the first stiffening boss.

[0035] Preferably, the rear section is parallel to the first stiffening boss.

[0036] Preferably, the rear section is aligned with the first stiffening boss.

[0037] Preferably, the rear section includes a cavity conforming to the first stiffening boss.

[0038] Preferably, the fixing flange is a front flange.

[0039] Preferably, the fixing flange is a horizontal flange.

[0040] Preferably, the flat area extends from the front end.

[0041] Preferably, the first stiffening boss includes a first vertex.

[0042] According to another aspect, the invention proposes a motor vehicle structure, the structure comprising a passenger compartment; a floor plate under the passenger compartment, said floor plate comprising a first stiffening bulge with a front end; a cross member with a mounting flange along the first stiffening bulge; a longitudinal stiffener along the first stiffening bulge; notable in that the longitudinal stiffener comprises a front section with at least one front bulge extending forward from the front end and being fixed to the floor plate; a rear section with a rear bulge along the first stiffening bulge. This structure provides a rear bulge complementing the reinforcement provided by the first stiffening bulge.

[0043] According to another aspect, the invention proposes a motor vehicle floor structure, the floor comprising: a floor plate intended to delimit a passenger compartment, said floor plate comprising a first stiffening bulge extending longitudinally; a cross member with a longitudinal fixing flange at the level of the first stiffening bulge; a longitudinal stiffener along the first stiffening bulge; characterized in that: the longitudinal stiffener comprises a front section fixed to the floor plate and comprising at least one front bulge; a rear section with a rear bulge that is different from the at least one front bulge, and that extends along the first stiffening bulge and the fixing flange. This floor optimizes rigidity and modularity.

[0044] According to another aspect, the invention proposes a motor vehicle comprising a structure, remarkable in that the structure conforms to the invention.

[0045] Preferably, the motor vehicle includes a rear side seat with a center, the longitudinal stiffener being transversely aligned on said center.

[0046] Preferably, the rear boss is transversely aligned with the center.

[0047] According to another aspect, the invention proposes a motor vehicle comprising a floor; remarkable in that the floor conforms to the invention.

[0048] 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.

[0049] 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.

[0050] Fig. 1 is a side view of a motor vehicle according to the invention.

[0051] Fig. 2 shows a portion of the structure of a motor vehicle according to the invention.

[0052] Figure 3 represents a motor vehicle structure floor according to the invention.

[0053] Fig. 4 is a cross-section of a motor vehicle structure according to the invention.

[0054] Figure 5 shows a motor vehicle structure according to one embodiment of the invention.

[0055] Figure 6 shows a motor vehicle structure according to another mode of realization of the invention.

[0056] 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 the structure to which it relates. It is understood that the term "include" includes the terms "consist of". The terms "external" and "internal" shall respectively designate what is oriented towards the outside of the vehicle and towards the inside of the vehicle.

[0057] 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. The term "longitudinal" refers to the principal direction of travel of the vehicle. The term "transverse" refers to a direction perpendicular to the principal direction of travel of the vehicle. The term "front" refers to the principal direction of travel of the vehicle. The term "rear" refers to the opposite of the front of the vehicle.

[0058] 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 across the figures.

[0059] 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.

[0060] In this description, the technical characteristics are defined in the mounting configuration of the structure, unless otherwise explicitly stated.

[0061] Throughout the description, the different figures use the same reference signs to designate identical or similar entities.

[0062] 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 motor (not shown) adapted to drive said motor vehicle 10.

[0063] The motor vehicle 10 comprises a structure 12. The structure 12 forms an outer body, or the main frame of the motor vehicle. The structure 12 delineates various compartments of the motor vehicle 10, including the passenger compartment 14, the cargo area, and the engine compartment (not shown). The structure 12 may be formed from an assembly of stamped and welded sheet metal parts.

[0064] 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.

[0065] The structure 12 includes a floor plate 16. The floor plate 16 is essentially horizontal. It forms the floor of the passenger compartment 14. The floor plate 16 extends along the passenger compartment 14. It extends substantially over the entire width of the structure 12 and / or the entire length of the passenger compartment 14.

[0066] The motor vehicle 10 includes at least one rear side seat 18. The rear side seat 18 includes a seat cushion and a backrest. The at least one rear side seat 18 may be formed by a rear bench seat. The rear side seat 18 is either a left-hand or a right-hand rear seat. Depending on the transverse direction, the rear side seat 18 includes a center 20. The center 20 is located in the lateral midpoint.

[0067] A child seat 22 is installed on the rear side seat 18. The child seat 22 is, for example, attached to the rear side seat 18 by a hook anchor system and / or by a seat belt. The child seat 22 is forward-facing or rear-facing. To optimize its stability, the child seat 22 includes a leg Force 24. During braking, the child seat 22 tilts forward, causing the strut 24 to puncture the floor panel 16. This panel tends to deform. In the case of a motor vehicle with an electric battery under the floor panel 16, the panel is likely to come into contact with the battery and potentially damage it.

[0068] The structure 12 includes a longitudinal stiffener 26. The longitudinal stiffener 26 resists forces exerted on the structure 12. It stiffens it. The structure 12 is located under the strut 24. The longitudinal stiffener 26 is against the floor plate 16. It forms a support interface. The longitudinal stiffener 26 is transversely aligned with the center 20 of the rear lateral space 18. Thus, it limits the deformations generated by the strut 24, particularly during a deceleration phase.

[0069] The motor vehicle can, for example, be a private motor vehicle.

[0070] Figure [Fig. 2] shows a structural part 12 of a motor vehicle, according to a embodiment of the invention. The motor vehicle may correspond to the one shown in relation to [Fig. 1].

[0071] The structure 12 includes side rails 28 bordering the floor plate 16. The structure 12 includes at least one cross member 30. The cross member 30 connects the side rails 28. The cross member 30 is preferably an upper cross member, and / or a rear cross member 32. It is a main cross member at the level of the passenger compartment 14. The rear cross member 32 is behind the floor plate 16. It is under the rear side seat. It forms a mounting support for the rear seat (not shown). It is commonly referred to as a heel board.

[0072] The structure 12 also includes a front cross member 34. The front cross member 34 is located in front of the rear cross member 32. It is a lower cross member. It forms a mounting support for front seats. The structure 12 includes at least one longitudinal stiffener 26, preferably two longitudinal stiffeners 26, each associated with one of the rear side seats (not shown), and preferably each centered on one of the centers of the rear side seats. Each longitudinal stiffener 26 forms a reinforcement plate.

[0073] The floor plate 16 comprises a plurality of stiffening bosses. Under the passenger compartment 14, said floor plate 16 comprises at least one first stiffening boss 36 and second stiffening bosses 38 extending longitudinally. The bosses are parallel. They are longitudinal stiffening bosses. The cross member 30 has a longitudinal mounting flange at each first stiffening boss 36. The cross member 30 intersects the first stiffening bosses 36 and the second stiffening bosses 38.

[0074] Each longitudinal stiffener 26 is associated with one of the first stiffening bosses 36. Each longitudinal stiffener 26 is fitted onto one of the first stiffening bosses 36. Longitudinal stiffeners 26 extend from the front cross member 34 to the rear cross member 32.

[0075] Figure 3 shows a floor with a floor plate 16 and a longitudinal stiffener 26 of 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. The crossmember is not shown for clarity.

[0076] The floor plate 16 is generally flat and includes a first stiffening boss 36 and second stiffening bosses 38. The first stiffening boss 36 is continuous. Two consecutive second stiffening bosses 38 frame the longitudinal stiffener 26. The longitudinal stiffener 26 includes a front section 40 fixed to the floor plate and comprising at least one front boss 42; preferably two front bosses 42. Each boss is raised relative to its reference plate. Each stiffening boss has a length greater than its associated transverse width.

[0077] The longitudinal stiffener 26 also includes a rear section 44 with a rear boss 46. The rear boss 46 is distinct from at least one front boss 42 and extends along the first stiffening boss 36 and the cross member's mounting flange. The rear section 44 has a length greater than or equal to 5 cm; preferably, greater than or equal to 12 cm. The length is an average length. It is measured longitudinally.

[0078] The first stiffening boss 36 and the longitudinal stiffener 26 are superimposed. They have complementary shaped surfaces. The rear section 44 is aligned with the first stiffening boss 36. The rear section 44 is parallel to the first stiffening boss 36. At least one front boss 42 is longer than the rear boss 46. The longitudinal stiffener 26 is transversely aligned with the center of the right-hand side rear seat (not shown). The rear boss 46 is transversely aligned with the center.

[0079] The floor plate 16 includes a flat area 48. The flat area 48 extends transversely across the entire width of the longitudinal stiffener 26, or at least across the entire width of the front section 40. The flat area 48 extends between two consecutive second stiffening bosses 38. It is forward of the first stiffening boss 36. The front section 40 is attached to the flat area 48, for example by spot welds. The flat area 48 extends from the front end of the first stiffening boss 36. The flat area 48 is in the forward extension of the first stiffening boss 36.

[0080] The longitudinal stiffener 26 includes longitudinally extending fixing blades 50. The fixing blades 50 extend along the entire length of the longitudinal stiffener 26. The fixing blades 50 extend into the flat area 48.

[0081] The longitudinal stiffener 26 further includes front tabs 76. The front tabs 76 are intended to be attached to another cross member. Thus, the longitudinal stiffener 26 longitudinally connects the cross members of the structure 12, thereby optimizing stiffness, mass, and the number of elements.

[0082] The present figure is described in relation to one side of the structure. However, the present description also applies to the opposite side.

[0083] Figure 4 is a cross-section of the floor structure 12 of a motor vehicle, 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.

[0084] The cut passes through the floor plate 16, the longitudinal stiffener 26, and the cross member's mounting flange 52. The mounting flange 52 is a horizontal mounting flange. It is a front flange, in that it extends forward along the cross member. More precisely, the cut passes through the first stiffening boss 36, two adjacent second stiffening bosses 38, and the rear boss 46.

[0085] The first stiffening boss 36 includes a front end 54. The front end 54 longitudinally defines the first stiffening boss 36. The front end 54 is positioned longitudinally at the rear boss 46. The front end 54 is within the rear boss. The rear section 44 is vertically positioned between the mounting flange and the floor plate. The front section 40 is forward of the front end 54.

[0086] In the present embodiment, the longitudinal stiffener 26 comprises two front bosses 42. The combination of the front bosses 42 has a first internal volume. This first internal volume is the sum of the internal volumes of each front boss 42. The rear boss 46 comprises a second internal volume that is larger than the first internal volume. This feature increases the rigidity of the longitudinal stiffener 26.

[0087] The front bosses 42 are separated by a longitudinal groove 56. The longitudinal groove 56 is against the floor plate 16, in particular against the flat area 48. The longitudinal groove 56 separates the two front bosses 42. It contributes to the rigidity.

[0088] Each front boss 42 is higher than the rear boss 46. Transversely, the rear boss 46 is wider than the first stiffening boss 36 and / or than each front boss 42. These aspects optimize the compactness and stiffness provided to the longitudinal stiffener 26. Each front boss 42 includes a front apex 58. The rear boss 46 includes a rear apex 60 that is lower than each front apex 58. Each front apex 58 and the rear apex 60 each have a flat surface, for example, horizontal.

[0089] The rear boss 46, the first stiffening boss 36, and the mounting flange 52 form a stack. These elements are positioned against each other. The longitudinal stiffener 26, in particular the rear boss 46, is interposed between the first stiffening boss 36 and the mounting flange 52. The stack is secured by a three-layer spot weld 62. The rear apex 60 is fixed to the mounting flange 52.

[0090] The longitudinal stiffener 26 comprises at least one connecting ramp 64 which longitudinally connects at least one front boss 42 to the rear boss 46. The connecting ramp 64 rises forward. It is inclined with respect to the horizontal direction. The connecting ramp 64 is inclined with respect to the floor plate 16, preferably at an angle of inclination between 5° and 45°, more preferably between 10° and 30°.

[0091] The rear section 44 is vertically aligned with the first stiffening boss 36. The rear section 44, particularly the rear boss 46, defines a cavity that preferably accommodates the first stiffening boss 36 to allow vertical contact. The rear boss 46 is transversely wider than the first stiffening boss 36. Within its cavity, the rear boss 46 has lateral clearances on either side of the first stiffening boss 36. These features increase rigidity.

[0092] The longitudinal stiffener plate 26 is thicker than the floor plate 16. The fixing flange 52 is fixed to the second stiffening bosses 38 via second weld points 70. Other second weld points 70 fix the fixing blades 50 to the flat area 48.

[0093] Each first stiffening boss 36 comprises a first height 66. The second stiffening bosses 38 comprise a second height 68. The second height 68 is greater than the first height 66. These bosses comprise different longitudinal profiles. The difference in height corresponds to the thickness of the sheet metal of the longitudinal stiffener 26. Consequently, the second stiffening bosses 38, as well as the rear boss 46 bearing on the first stiffening boss 36, provide a flat surface for the support and attachment of the mounting flange 52. The attachment is more robust.

[0094] According to an alternative of the invention, the first boss protrudes downwards, and the longitudinal stiffener is above the floor plate.

[0095] According to an alternative of the invention, the fixing flange is a rear flange.

[0096] According to an alternative embodiment of the invention, the longitudinal stiffener comprises a step junction which connects at least one front boss to the rear boss.

[0097] According to an alternative of the invention, the longitudinal stiffener is under the floor plate.

[0098] Figure 5 shows a structural part 12 of a motor vehicle, according to an embodiment of the invention. The motor vehicle may correspond to the one shown in relation to one of Figures 1 to 4.

[0099] The structure 12 comprises a floor plate 16 with a first stiffening boss (not visible) extending longitudinally; a cross member 30 with a mounting flange 52 extending longitudinally at the first stiffening boss; and a longitudinal stiffener 26 along the first stiffening boss. The longitudinal stiffener 26 comprises a front section 40 fixed to the floor plate 16 and including at least one front boss 42; a rear section 44 with a rear boss 46 that differs from the at least one front boss 42, and that extends along the first stiffening boss and the mounting flange 52. The rear section 44 comprises a front half 72 and a rear half 74. The mounting flange 52 of the cross member 30 is here fixed to the rear half 74.

[0100] The rear boss 46, the first stiffening boss and the fixing flange 52 form a stack; preferably, the stack is fixed by a triple thickness weld point.

[0101] Figure 6 shows a structural part 12 of a motor vehicle, according to an embodiment of the invention. The motor vehicle may correspond to the one shown in relation to one of Figures 1 to 4.

[0102] The structure 12 comprises a floor plate 16 with a first stiffening boss 36 extending longitudinally; a cross member 30 with a mounting flange 52 extending longitudinally at the first stiffening boss 36; a longitudinal stiffener 26 along the first stiffening boss 36. The longitudinal stiffener 26 comprises a front section 40 fixed to the floor plate 16 and comprising at least one front boss 42; a rear section 44 with a rear boss 46 that is different from the at least one front boss 42, and that extends along the first stiffening boss 36 and the mounting flange 52. The rear section 44 comprises a front half 72 and a rear half 74, the mounting flange of the cross member being fixed to the front half 72.

[0103] Therefore, the cross member 30, in particular its mounting bracket 52, is indiscriminately connected to either the front half or the front half of the rear section 44. Consequently, the same floor panel 16, cross member 30, and longitudinal stiffener 26 designs can be used to create different car models. In particular, the invention allows for variations in platform and passenger compartment length. The invention provides increased modularity. It allows for the creation of several wheelbases using the same structural components.

[0104] The floor plate 16, the cross member 30 and the longitudinal stiffener 26 are metallic. They are produced from cut and stamped sheet metal. These sheets are then welded or glued to materialize structure 12. The sheets are made of steel. According to one alternative of the invention, they are made of aluminium. Other alloys are considered.

[0105] The invention comprises the combination of all the embodiments illustrated by all the figures.

[0106] Figures 2 to 6 are isometric views. They each respect a specific scale, real angles and real proportions.

Claims

Demands

1. Motor vehicle (10) structure (12), the structure (12) comprising a passenger compartment (14); a floor plate (16) under the passenger compartment (14), said floor plate (16) comprising a first stiffening boss (36) extending longitudinally; a cross member (30) with a fixing flange (52) longitudinally at the level of the first stiffening boss (36); a longitudinal stiffener (26) along the first stiffening boss (36); characterized in that the longitudinal stiffener (26) comprises a front section (40) fixed to the floor plate (16) and comprising at least one front boss (42); a rear section (44) with a rear boss (46) which is different from the at least one front boss (42), and which extends along the first stiffening boss (36) and the fixing flange (52).

2. Structure (12) according to claim 1, characterized in that the first stiffening boss (36) comprises a front end (54) along the rear boss (46); preferably, the rear section (44) is vertically between the fixing flange (52) and the floor plate (16).

3. Structure (12) according to any one of claims 1 to 2, characterized in that the rear boss (46) is wider than the first stiffening boss (36); and / or the rear boss (46) is wider than each front boss (42).

4. Structure (12) according to any one of claims 1 to 3, characterized in that the front boss (42) comprises a front peak (58), the rear boss (46) comprises a rear peak (60) below the front peak (58); preferably, the rear peak (60) is fixed to the fixing flange (52).

5. Structure (12) according to any one of claims 1 to 4, characterized in that the floor plate (16) comprises two second stiffening bosses (38), a flat area (48) between the second bosses and in front of the first stiffening boss (36), the front section (40) being fixed to said flat area (48); preferably, the first stiffening boss (36) comprises a first height (66), the second stiffening bosses (38) comprise a second height (68) greater than the first height (66).

6. Structure (12) according to any one of claims 1 to 5, characterized in that the longitudinal stiffener (26) comprises a connecting ramp (64) which longitudinally connects at least one front boss (42) to the rear boss (46) and which is inclined with respect to the floor plate (16).

7. Structure (12) according to any one of claims 1 to 6, characterized in that the at least one front boss (42) comprises a first internal volume, and the rear boss (46) comprises a second internal volume which is greater than the first internal volume; preferably, the at least one front boss (42) comprises two front bosses (42), and the longitudinal stiffener (26) comprises a longitudinal groove (56) between the two front bosses (42).

8. Structure (12) according to any one of claims 1 to 7, characterized in that the rear boss (46), the first stiffening boss (36) and the fixing flange (52) form a stack; preferably, the stack is fixed by a three-thickness spot weld (62).

9. Structure (12) according to any one of claims 1 to 8, characterized in that the rear section (44) comprises a front half (72) and a rear half (74), the fixing flange (52) of the cross member (30) is fixed to the rear half (74) or to the front half (72).

10. Motor vehicle (10) comprising a structure (12), characterized in that the structure (12) conforms to any one of claims 1 to 9; preferably, the motor vehicle (10) comprises a rear side seat (18) with a center (20), the longitudinal stiffener (26) being transversely aligned with said center (20).

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