Automotive vehicle structure floor with drainage

Abstract

The invention proposes a motor vehicle structure (12). The structure (12) comprises a floor (20) including: a first part (32) with an upper surface (62) defining a general plane (36), and a rear part (34) with an upwardly inclined surface (64) opposite the first part (32). The first part (32) includes first longitudinal bosses (38) projecting from the general plane (36), and a longitudinal plane separation (42) between the first longitudinal bosses and the rear part (34) to allow water to flow laterally around the first longitudinal bosses (38). The inclined surface (64) covers an electric battery control box. Figure to be published with the abbreviation: Figure 4

Description

Title of the invention: Motor vehicle structural floor with drainage

[0001] The invention relates to a motor vehicle structure coated with a cataphoresis treatment. More specifically, the invention relates to rinsing a motor vehicle structure after immersion in a cataphoresis bath. The invention relates to a motor vehicle structure with a floor featuring longitudinal bosses. The invention also relates to a motor vehicle.

[0002] A motor vehicle comprises a structure, generally considered to be a load-bearing frame. The structure extends from the rear compartment to the front compartment, passing through the passenger compartment; also called the passenger compartment. The structure defines certain areas such as the wheel arches. In addition, the structure supports various equipment. Finishing elements are commonly attached to it according to a precise geometry in order to meet a perceived quality standard.

[0003] The structure is formed from a series of stamped and joined sheets. After being joined, particularly by welding, the sheets receive a surface coating to protect them against corrosion. Advantageously, a cataphoresis film followed by a coat of paint is applied. These sheets can then be used to form a floor, stringers, and pillars, for example. The structure can form both concealed interior sections and visible exterior sections.

[0004] Cataphoretic coating is widely used in the automotive industry. This coating is of the "cationic electrodeposition" type. It involves electrochemically applying an epoxy base to a steel blank by immersing it in a cataphoresis bath. Thanks to ion separation, the coating covers the entire surface immersed in the cataphoresis bath, providing a uniform finish. In particular, it offers homogeneous coverage of edges, openings, and hidden surfaces.

[0005] Document FR3129883B1 describes a closing device for an opening used by a locking system for a component of a vehicle. The closing device is associated with an opening intended for use by a seat. The closing device comprises a cavity configured to serve as a housing for one end of a first movable element of a locking system in the locked position. The closing device includes a support mechanically connected to the cavity, in particular at least partially surrounding the cavity. The support is intended to be fixed to a second fixed element of a locking system. The closing device provides a closing function for an opening provided in a vehicle floor, while allowing the evacuation of liquids, for example after a vehicle underbody has passed through a cataphoresis bath or after a floor cleaning.

[0006] Document FR2878222B1 describes a motor vehicle comprising a structure with a first floor. The first floor has a raised, flat area and a lower area contiguous to the first area. The lower area is surrounded by a raised frame, and a second floor is mechanically fixed to the frame in a plane aligned with that of the first area. To manufacture this vehicle, the structure incorporating the first floor area, the lower area, and the raised frame is assembled, but not the second floor. The temporary structure undergoes conventional surface treatment, including filling, cataphoresis, and painting. It is also known to produce a motor vehicle structure, said structure having a straight tongue-and-groove joint. The structure has a series of longitudinal bosses on which the straight tongue rests.These bumps create a vertical offset in the heel board, allowing the cataphoresis liquid to flow.

[0007] Generally, following immersion in a cataphoresis bath, residues remain on the treated surfaces. It is therefore necessary to clean them to remove these residues. Prolonged water spraying rinses the structure and removes the surface residues.

[0008] A vehicle floor commonly features variations in level and stiffening ribs. The ribs guide the cataphoresis liquid as the blank body is removed from the cataphoresis bath. The liquid drains away by gravity, tilting the body as it exits the bath. However, during rinsing with water, these same ribs tend to trap water, particularly at floor level variations. Therefore, certain structural geometries tend to block the flow of rinsing water. This residual water interferes with the subsequent curing process, which aims to polymerize and fix the cataphoresis deposit. Consequently, the resulting cataphoresis coating is no longer homogeneous, thus compromising both its effectiveness and durability. In the long term, a risk of corrosion arises.

[0009] 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 drainage of liquid from a motor vehicle floor. The invention also aims to optimize the cost, strength, and drainage of liquid between longitudinal bosses of a structure on a motor vehicle floor.

[0010] According to a first aspect, the invention proposes a motor vehicle structure; the structure comprising a floor having: a first part with a surface upper defining a general plane, a rear part behind the first part, the rear part having a surface inclined upwards towards the opposite of the first part; remarkable in that the first part comprises: first longitudinal bosses projecting upwards from the general plane; a planar separation which is vertically at the level of the general plane and which is longitudinally between the first longitudinal bosses and the rear part in order to permit a flow laterally bypassing the first longitudinal bosses.

[0011] Thanks to the flat separation at the overall level, the floor prevents water from stagnating between the first longitudinal bosses. This precaution against water ingress is beneficial when rinsing the structure. This promotes the homogeneity of the applied surface treatment.

[0012] Preferably, the rear part comprises rear longitudinal bosses extending along the inclined surface; the planar separation longitudinally separates the rear longitudinal bosses from the first longitudinal bosses.

[0013] Preferably, the planar separation comprises a straight ribbon extending transversely.

[0014] Preferably, the straight ribbon extends transversely over at least half the width of the first part.

[0015] Preferably, the first part is a front section; the rear part is a rear section; the floor has a longitudinal interface between the front section and the rear section which is formed by the planar separation.

[0016] Preferably, the front section is wider than the rear section.

[0017] Preferably, the inclined surface extends transversely over at most half of the floor.

[0018] Preferably, the rear part has an upper platform longitudinally at a distance from the flat separation.

[0019] Preferably, the structure comprises a cross member with a vertical partition and a fixing flange against the first longitudinal bosses, the flat separation being behind the fixing flange.

[0020] Preferably, the cross member includes a horizontal partition above the flat separation.

[0021] Preferably, the floor comprises lateral longitudinal bosses extending longitudinally at the level of the plane separation.

[0022] Preferably, the lateral longitudinal bosses extend over the front part and the rear part.

[0023] Preferably, the first longitudinal bosses comprise a transverse width, the planar separation comprises a longitudinal length less than the transverse width.

[0024] Preferably, the first longitudinal bosses comprise a boss height less than the longitudinal length.

[0025] Preferably, the first part is a front part extending in front of the rear part.

[0026] Preferably, the first longitudinal bosses are front longitudinal bosses.

[0027] Preferably, the rear longitudinal bosses are aligned with the first longitudinal bosses.

[0028] Preferably, the longitudinal bosses are parallel.

[0029] Preferably, the longitudinal bosses are stiffening longitudinal bosses.

[0030] Preferably, the longitudinal bosses are distributed over the entire floor.

[0031] Preferably, the mounting flange is flat.

[0032] Preferably, the planar separation is vertically at a distance from the fixing flange.

[0033] Preferably, the first part is sealed between the first longitudinal bosses.

[0034] Preferably, the floor comprises several panels.

[0035] Preferably, the structure includes lateral stringers, the lateral longitudinal bosses are interposed between the flat separation and the lateral stringers.

[0036] Preferably, the structure includes a seat partition fixed to the horizontal partition of the cross member.

[0037] Preferably, the floor comprises a sheet metal forming the front part and the rear part.

[0038] According to another aspect, the invention proposes a motor vehicle structure; the structure comprising at least one floor having: a front portion with an upper surface defining a general plane, a rear portion with a surface rising from the front portion to the rear; notable in that the floor comprises a set of longitudinal bosses extending along the front portion and the rising surface, projecting from the general plane, the front portion having a flat separation passing transversely through the set of longitudinal bosses to allow water to flow out of the set of longitudinal bosses. Such a floor optimizes the rigidity and the flow of rinse water from a cataphoresis bath.

[0039] According to another aspect, the invention proposes a motor vehicle comprising a structure, remarkable in that the structure conforms to the invention.

[0040] Preferably, the motor vehicle includes a rear seat above the rear part, and the structure includes an epoxy protective coating.

[0041] Preferably, the motor vehicle includes an electrical power supply system under the floor, the electrical power supply system including energy storage cells under the first part and a control box under the rear part and vertically at the level of the flat separation.

[0042] Preferably, the energy storage cells have a first height, the control box includes a second height greater than the first height.

[0043] 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.

[0044] 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.

[0045] Fig. 1 is a side view of a motor vehicle according to the invention.

[0046] Figure 2 shows a lower portion of a motor vehicle structure according to the invention.

[0047] Figure 3 is a cross-section of the structure of a motor vehicle according to the invention. represented in [Fig.2].

[0048] Figure 4 is a top view of a rear part of a vehicle structure automobile according to the invention.

[0049] Figure 5 is a cross-section of the rear part of the motor vehicle structure represented in [Fig.4].

[0050] 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.

[0051] 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 vehicle's principal direction of travel. The term "transverse" refers to a direction perpendicular to the vehicle's principal direction of travel. The terms "lateral" and "laterally" refer to a direction towards the sides, left or right, of the motor vehicle. The term "front" refers to the vehicle's primary direction of movement. The term "rear" refers to the opposite of the front of the vehicle.

[0052] 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.

[0053] In this description, the ranges of values ​​include the bounds that delimit them.

[0054] In this description, the terms "vertical" and "horizontal" are not to be understood in their 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.

[0055] In this description, the technical characteristics are defined in the mounting configuration of the structure, unless otherwise explicitly stated.

[0056] Throughout the description, the different figures use the same reference signs to designate identical or similar entities.

[0057] Figure 1 represents a motor vehicle 10, according to an embodiment of the invention. The motor vehicle 10 comprises an electrical power supply system 14 and at least one motor (not shown) adapted to drive said motor vehicle 10.

[0058] The motor vehicle 10 comprises a structure 12. The structure 12 delimits various compartments of the motor vehicle 10, including the passenger compartment 16, 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.

[0059] The passenger compartment 16 has several seating positions; with seats. The seats are arranged in rows. The passenger compartment 16 has rear seats 18, behind front seats. The passenger compartment 16 is delimited by at least one floor 20. The at least one floor 20 may include a front floor associated with the front seats; a rear floor associated with the rear seats and therefore under the rear seats 18.

[0060] The electrical power supply system 14 is arranged under the floor 20. It is distributed under the floor 20. The structure 12 has several entities, including lateral stringers 22. The electrical power supply system 14 is arranged between the lateral stringers 22.

[0061] The motor vehicle can, for example, be a private motor vehicle or a commercial motor vehicle.

[0062] Figure 2 shows a structural part 12 of a motor vehicle according to an embodiment of the invention. This structural part 12 corresponds to the platform. The platform includes the underbody. The motor vehicle may correspond to the one shown in relation to Figure 1. The upper part of the structure is not shown for the sake of clarity.

[0063] The structure 12 forms an outer body, or the main frame of the motor vehicle. The structure 12 can be formed from an assembly of stamped and welded sheet metal. The structure is essentially made of steel.

[0064] According to an alternative embodiment of the invention, the structure 12 is made of aluminum. According to another alternative embodiment of the invention, the structure comprises sheets of organic matrix composite material.

[0065] On each side, the structure 12 includes a side member 22 extending along the passenger compartment 16. The side members 22 connect the wheel arches. The side members 22 extend along the passenger compartment 16. The side members 22 are main members, or central members. They define the openings for the side doors. They are hollowed out and house side impact absorption systems.

[0066] The structure 12 also has front side members 24 and rear side members 26, which extend respectively along the front and rear wheel arches. The side member 22 is longitudinally positioned between the front side member 24 and the rear side member 26. The floor 20 is longitudinally positioned at a distance from the front side member 24 and the rear side member 26.

[0067] The structure 12 includes a cross member 28 with a vertical partition and a fixing flange. The cross member 28 is horizontal. It forms a beam extending laterally. It connects transversely to the side rails 22. It rests on the floor 20. The cross member 28 is a rear cross member.

[0068] The floor 20 has a set of longitudinal bosses 30. The longitudinal bosses 30 are parallel. They are distributed over the floor 20. The longitudinal bosses are stiffening longitudinal bosses. They stiffen the floor 20.

[0069] Structure 12 includes a surface treatment. Structure 12 is covered with a film. It includes an epoxy protective coating. This coating is deposited by electrophoresis. The epoxy protective coating protects against corrosion.

[0070] Figure 3 shows a rear section of a motor vehicle structure 12, according to an embodiment of the invention. The rear section is a rear section of platform. The motor vehicle may correspond to the one shown in relation to one of figures 1 to 2.

[0071] The structure 12 comprises a floor 20 having: a first portion 32, a rear portion 34 behind and adjoining the first portion 32. The rear portion 34 extends rearward from the first portion 32. The first portion 32 has an upper surface defining a general plane 36. The general plane 36 is horizontal. The rear portion 34 has a surface inclined upwards in the opposite direction from the first portion 32. The inclined surface is on the upper face of the rear portion. On its upper face, the floor 20 is covered with a set of longitudinal bosses 30.

[0072] At the level of the first part 32, the set of longitudinal bosses 30 includes first longitudinal bosses 38. The first longitudinal bosses 38 project upwards relative to the general plane 36. At the level of the rear part 34, the set of longitudinal bosses 30 has rear longitudinal bosses 40. They are parallel.

[0073] The first part 32 further presents a longitudinal plane separation 42 between the first longitudinal bosses 38 and the rear part 34 in order to allow water to flow laterally around the first longitudinal bosses 38. Thus, if the structure 12 is sprayed with water after a cataphoresis bath, the water can drain away by gravity. This result is achieved while maintaining a horizontal orientation of the structure. It can dry without needing to be tilted in any direction.

[0074] The rear longitudinal bosses 40; generally forming second longitudinal bosses; extend along the inclined surface of the rear part 34. The planar separation 42 longitudinally separates the rear longitudinal bosses 40 from the first longitudinal bosses 38. It is intercalated between them.

[0075] The structure 12 comprises a cross member 28 with a vertical partition 44 and a mounting flange 46 against the first longitudinal bosses 38. The mounting flange 46 is welded to the first longitudinal bosses 38. The mounting flange 46 is flat. The cross member 28 is a rear cross member. It is also referred to as a heel board. The flat partition 42 is behind the mounting flange 46. The flat partition 42 is vertically offset from the mounting flange 46. The cross member 28 compensates for the flexibility induced by the flat partition 42.

[0076] Thus, during the cataphoresis treatment, the cataphoresis bath flows between the first longitudinal bosses 38, under the fixing flange 46 when the structure 12 is lifted out of the cataphoresis bath. The cross member 28 has a horizontal partition 48 above the flat separation 42. The horizontal partition 48 supports the seat rear 18. The structure 12 includes a seat partition 60 fixed to the horizontal partition 48 of the cross member 28.

[0077] The motor vehicle includes an electrical power supply system 14 under the floor 20. The electrical power supply system 14 generally forms energy storage means. It includes energy storage cells 50 under the first section 32. The energy storage cells 50 are distributed along the length of the floor 20 and across its width between the side rails 22. The electrical power supply system 14 also includes a control box 52 under the rear section 34. The control box 52 is longitudinally distanced from the first section 32. It is also distanced from the planar partition 42.

[0078] The control box 52 includes control relays and fuses. It is electrically connected to the energy storage cells 50. The control box 52 is vertically positioned at the level of the flat separation 42. It vertically overlaps a portion of the rear part 34.

[0079] The energy storage cells 50 have a first height 54. The control box 52 includes a second height 56 ​​that is greater than the first height 54. The heights are maximum heights. They are measured relative to the ground, or to a reference height of the structure 12. The control box 52 is taller to occupy less transverse space. This is precisely compensated for by the inclination of the rear portion 34 and its inclined surface. The inclined surface is in front of the control box 52.

[0080] The power supply system 14 is protected by a lower cover 58. It is housed in a sealed enclosure delimited by the lower cover 58 and the floor 20. In the present configuration, the floor 20 is used as the upper cover. This configuration is referred to by the Anglo-Saxon expression "Cell to body".

[0081] According to a preferred embodiment, the lower cover 58 is made of a plastic or composite material. The plastic material may include a thermoplastic or thermosetting material. According to a preferred embodiment, the plastic material is selected from the group comprising polypropylene, polyamide, polyphthalamide, polyetheretherketone, polyphenylene sulfide, polyamide-imide, polyetherimide, polyarylamide, polyepoxide, unsaturated polyester, vinyl ester, or polyester-vinylester resins. For example, the composite material comprises a matrix of a plastic material as described above with reinforcement. For example, the reinforcement comprises glass or carbon fibers.

[0082] The lower cover 58 comprises at least 10% by weight of recycled plastic material based on the total weight of the plastic material; preferably from 10 to 80% by weight; more preferably 20 to 60% by weight or 30 to 40% by weight. The use of recycled plastic material reduces the vehicle's environmental footprint.

[0083] Figure 4 shows a top view of the rear section of 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. The crossmember and the optional seat partition are not shown for the sake of clarity.

[0084] The structure 12 has a floor 20 forming a load-bearing surface. The floor 20 is generally symmetrical. It has: a first part 32 with an upper surface 62 defining a general plane 36, and a rear part 34 behind the first part 32. The first part 32 has longitudinal channels between the first longitudinal bosses 38. The bottoms of these longitudinal channels are formed by the upper surface 62 and are at the level of the general plane 36.

[0085] The rear portion 34 shows an upward-sloping surface 64 opposite the first portion 32. The sloping surface 64 forms a ramp rising towards the rear. It is a rear rise. The upper surface 62 is stiffened by the first longitudinal bosses 38. The sloping surface 64 forms a wave at the rear of the floor 20. It is stiffened by the rear longitudinal bosses 40.

[0086] Generally, the inclined surface 64 is a rising surface towards the rear.

[0087] The first longitudinal bosses 38 project upwards from the plane General plane 36. The general plane 36 is a geometric plane. It can be a principal plane, formed by the horizontal extent of the first part 32. The latter terminates at a planar separation 42 longitudinally between the first longitudinal bosses 38 and the rear part 34. The first part 32 is a front part extending forward from the rear part 34. These parts meet at the planar separation 42. They are adjacent. The first part 32 can be a central part.

[0088] The plane separation 42 is vertically at the level of the general plane 36. The plane separation 42 delimits the first longitudinal bosses 38 on the side of the inclined surface 64. Thus, the plane separation 42 facilitates a flow of water laterally bypassing the first longitudinal bosses 38. When the structure 12 is sprayed, whether as part of a treatment by cataphoresis or for another reason, the water drains away naturally.

[0089] The rear portion 34 comprises rear longitudinal bosses 40 extending along the inclined surface 64. They extend along its entire longitudinal length and join the first portion 32. They are shorter than the first longitudinal bosses 38. The planar separation 42 also separates the rear longitudinal bosses 40 from the first longitudinal bosses 38. It creates a transverse passage through these two sets of longitudinal bosses. The planar separation 42 cuts and divides these sets of longitudinal bosses.

[0090] The flat separation 42 includes a straight strip 66. It forms a straight and horizontal track. The straight strip 66 forms the bottom of a water drainage channel. The straight strip 66 extends laterally. It is horizontal. It is continuous. The straight strip 66 extends transversely over at least half the width of the first part 32, preferably over at least half the width of the floor 20. The straight strip 66 extends over the entire width of the inclined surface 64. This allows the flow to bypass the latter and then be directed to the rear.

[0091] The inclined surface 64 extends transversely over at most half of the structure 12. The rear portion 34, generally forming a second part, has an upper platform 68. The upper platform 68 is longitudinally spaced from the flat separation 42. It forms the general apex of the rear portion 34. It is horizontal. It is at the rear end of the inclined surface 64. The rear longitudinal bosses 40 extend over the upper platform 68 to stiffen it. The inclined surface 64 and the upper platform 68 form a protrusion on the floor 20.

[0092] The rear longitudinal bosses 40 are aligned with the first longitudinal bosses 38. The floor 20 comprises more first longitudinal bosses 38 than rear longitudinal bosses 40. The latter are located on a narrower section. The need for stiffening is reduced. The flexibility line of the flat separation 42 is compensated for by the configuration of the inclined surface 64.

[0093] On the sides of the floor 20, the longitudinal boss assembly 30 includes lateral longitudinal bosses 70. The lateral longitudinal bosses 70 extend longitudinally at the level of the flat separation 42. The lateral longitudinal bosses 70 extend over the first part 32 and the rear part 34. They extend along the first longitudinal bosses 38 and the rear longitudinal bosses 40. Thus, they stiffen the floor 20 at the level of the flat separation 42. In addition, they channel the flow of water escaping through the flat separation 42.

[0094] According to an alternative of the invention, the flat separation is inclined with respect to the transverse direction of the structure, for example at an angle between 10° and 30°.

[0095] According to an alternative of the invention, the planar separation describes an arc on the first part.

[0096] According to an alternative of the invention, the inclined surface is perpendicular to the general plane.

[0097] Figure 5 shows a cross-section of a rear portion of the 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 4. A control box 52 is shown schematically.

[0098] The first part 32 comprises first longitudinal bosses 38 in elevation relative to the general plane 36, and a longitudinally arranged flat separation 42 joining the first longitudinal bosses 38 to the rear part 34. The flat separation 42 is flush with the general plane 36, which, during rinsing, promotes a flow 80 of water laterally bypassing the inclined surface 64. The flow 80 also bypasses the first longitudinal bosses 38. The flow 80 is discharged at the rear by passing through the rear part 34.

[0099] The planar separation 42 includes lateral ends 72 transversely at a distance from the lateral stringers 22. The lateral longitudinal bosses 70 separate the lateral ends 72 from the lateral stringers 22. The lateral longitudinal bosses 70 laterally delimit the planar separation 42. They close it laterally.

[0100] The first longitudinal bosses 38 have a transverse width 74. The flat separation 42 has a longitudinal length 76 that is less than the transverse width 74. The transverse width is an average width. The longitudinal length is an average length. Thus, the passage through the flat separation 42 remains proportionally narrow compared to the longitudinal bosses. This optimizes the rigidity and water drainage capacity of the floor.

[0101] The first longitudinal bosses 38 have a boss height less than the longitudinal length 76. This aspect optimizes the compactness and water drainage capacity of the floor. The height is a maximum height.

[0102] The first part 34 is a front section. The rear part 34 is a rear section. They are longitudinal sections. The floor 20 has a longitudinal interface 78 between the front section and the rear section. The longitudinal interface 78 is formed by the planar separation 42. The longitudinal interface 78 connects the first part 32 to the rear part 34. Longitudinally, the front section is wider than the rear section.

[0103] The first section 32 is watertight between the first longitudinal bosses 38. The first section 32 is watertight along the flat separation 42. The floor 20 comprises a single sheet forming the first section 32 and the rear section 34. The first longitudinal bosses 38 and the rear longitudinal bosses 40 are formed from the sheet. They are produced by stamping. The first longitudinal bosses 38 are front longitudinal bosses.

[0104] The invention comprises the combination of all the embodiments illustrated by all the figures.

[0105] Figures 2 to 5 are isometric views. They each respect a specific scale, real angles and real proportions.

Claims

Demands

1. Structure (12) of motor vehicle (10); the structure (12) comprising a floor (20) having: a first part (32) with an upper surface (62) defining a general plane (36), a rear part (34) behind the first part (32), the rear part (34) having a surface inclined (64) upwards towards the opposite of the first part (32); characterized in that the first part (32) comprises: first longitudinal bosses (38) projecting upwards from the general plane (36); a planar separation (42) which is vertically at the level of the general plane (36) and which is longitudinally between the first longitudinal bosses (38) and the rear part (34) in order to allow a flow (80) laterally bypassing the first longitudinal bosses (38).

2. Structure (12) according to claim 1, characterized in that the rear part (34) comprises rear longitudinal bosses (40) extending along the inclined surface (64); the planar separation (42) longitudinally separates the rear longitudinal bosses (40) from the first longitudinal bosses (38).

3. Structure (12) according to any one of claims 1 to 2, characterized in that the planar separation (42) comprises a straight ribbon (66) extending transversely; preferably, the straight ribbon (66) extends transversely over at least half the width of the first part (32).

4. Structure (12) according to any one of claims 1 to 3, characterized in that the first part (32) is a front section; the rear part (34) is a rear section; the floor (20) has a longitudinal interface (78) between the front section and the rear section which is formed by the planar separation (42); preferably, the front section is wider than the rear section.

5. Structure (12) according to any one of claims 1 to 4, characterized in that the inclined surface (64) extends transversely over at most half of the floor (20) and / or the rear part (34) has an upper platform (68) longitudinally at a distance from the flat separation (42).

6. Structure (12) according to any one of claims 1 to 5, characterized in that the structure (12) comprises a cross member (28) with a vertical partition (44) and a fixing flange (46) against the first longitudinal bosses (38), the flat separation (42) being behind the fixing flange (46); preferably, the cross member (28) includes a horizontal partition (48) above the flat separation (42).

7. Structure (12) according to any one of claims 1 to 6, characterized in that the floor (20) comprises lateral longitudinal bosses (70) extending longitudinally at the level of the plane separation (42); preferably, the lateral longitudinal bosses (70) extend over the first part (32) and the rear part (34).

8. Structure (12) according to any one of claims 1 to 7, characterized in that the first longitudinal bosses (38) comprise a transverse width (74), the planar separation (42) comprises a longitudinal length (76) less than the transverse width (74); preferably, the first longitudinal bosses (38) comprise a boss height less than the longitudinal length (76).

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 motor vehicle (10) comprises a rear seat (18) above the rear part (34), and the structure (12) comprises an epoxy protective coating.

10. Motor vehicle (10) according to claim 9, characterized in that the motor vehicle (10) comprises an electrical power supply system (14) under the floor (20), the electrical power supply system (14) comprising energy storage cells (50) under the first part (32) and a control box (52) under the rear part (34) and vertically at the level of the flat separation (42); preferably, the energy storage cells (50) have a first height (54), the control box (52) comprises a second height (56) greater than the first height (54).

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