Vehicle false floor

Abstract

Vehicle subfloor (100) intended to rest on a vehicle floor structure (2), said subfloor (100) comprising a first part (3) having a first upper face (31) in a first plane, a second part (4) comprising a second upper face (41) extending in a plane inclined relative to the first upper face (31), the angle between the first face (31) and the second face (41) being obtuse, A part projecting on the side of the first (31) and second (41) upper faces of the subfloor (100), between the first part (3) and the second part (4), forming a heel support (5), the subfloor (100) comprising an acoustic layer (7), and a reinforcement (8) of expanded material in the acoustic layer (7), said reinforcement (8) extending into the heel support (5) and into the first part (3) and comprising zones of different densities. Figure for the summary: Fig. 2

Description

Title of the invention: Vehicle false floor TECHNICAL FIELD OF THE INVENTION

[0001] The invention relates to a vehicle false floor device.

[0002] The invention relates mainly to a false floor device for improving the protection of a vehicle occupant during a collision, particularly at the level of the lower limbs.

[0003] The invention further relates to a vehicle comprising a false floor device according to the invention.

[0004] TECHNOLOGICAL BACKGROUND OF THE INVENTION

[0005] To improve driving safety on board a motor vehicle, it is known to provide restraint devices for the lower limbs of a driver in particular to prevent and translational movements of the heel and rotations.

[0006] Thus, floor covering assemblies or so-called false floor devices comprising both layers of acoustic materials and reinforcements with shapes suitable for providing heel retention means are known.

[0007] Document FR2986754 describes a vehicle floor covering assembly comprising an acoustic layer and a receiving element consisting of a polystyrene block or a deformable box inserted between the acoustic layer and the carpet, said receiving element being positioned under the occupant's foot.

[0008] Furthermore, in the case of a raised floor, the receiving element must be extended rearward to provide rigidity to the raised floor. Due to material costs, the polystyrene densities usually used to make these large blocks are insufficient to provide adequate reinforcement of the area under the foot and behind the heel. Therefore, it is necessary to add a reinforcing plate on top of the polystyrene. Manufacturing such a raised floor becomes complex and is said to be carried out in several stages.

[0009] Thus, the state of the art is not efficient enough to offer a false floor capable of ensuring rear restraint of the heel of an occupant, which is easy to manufacture and therefore inexpensive.

[0010] GENERAL DESCRIPTION OF THE INVENTION

[0011] To this end, the invention proposes a vehicle false floor intended to rest on a vehicle floor structure, said false floor comprising - a first part comprising a first upper face in the foreground, - a second part comprising a second upper face extending in a plane inclined relative to the first upper face, the salient angle between the first face and the second face being obtuse, - A projecting section on the side of the first and second upper faces of the false floor, between the first and second sections, forming a heel support, the false floor comprising an acoustic layer, preferably made of foam-type material, extending at the level of the first, second parts and the heel support, and a reinforcement of expanded material in the acoustic layer and extending into the heel support and the first part,

[0012] said false floor being characterized in that the reinforcement comprises areas of different density.

[0013] Thus, the reinforcement by having zones of different density makes it possible to provide variable reinforcement according to said zones in accordance with the forces to which said false floor is subjected.

[0014] In one embodiment of the invention, the reinforcement comprises a first portion and a second portion, the density of the first portion being at least twice less than that of the second portion, preferably the density of the first portion being at least three times less than that of the second portion.

[0015] Thus, the density of the reinforcement being greater at the level of the heel support, the false floor, by means of the heel support, makes it possible to maintain the heel of the occupant during an impact.

[0016] In one embodiment of the invention, the first portion is connected to the second portion so as to constitute a continuous reinforcement.

[0017] In one embodiment of the invention, the first portion is disposed in the acoustic layer of the first part, the second portion being disposed in the acoustic layer of the heel support.

[0018] Thus the characteristics of the false floor allow for good vibro-acoustic insulation against noise and vibrations emitted by the floor.

[0019] In one embodiment of the invention, the second portion is arranged in the acoustic layer of the heel support and includes an extension in the acoustic layer of the first part, the second portion and the extension being substantially of the same density.

[0020] In one embodiment of the invention, the thickness of the reinforcement in the heel support is greater than the thickness of the reinforcement in the first part, so as to create the protruding part.

[0021] Thus the extra thickness of the protruding part is reinforced by the densest portion of the reinforcement.

[0022] In one embodiment of the invention, the first part of the false floor has a relief extending over an underside on the side opposite the upper side, projecting from this underside, extending from an edge of the first part opposite the second part, preferably the relief is included in the layer of foam-type material.

[0023] Thus, the relief is able to constitute a support from the lower face opposite the upper face.

[0024] In one embodiment of the invention, the false floor according to the invention includes an additional reinforcement, made of expanded material, arranged in the acoustic layer, forming part of the volume of the relief, said additional reinforcement being made of the same material and substantially of the same density as the first portion, preferably the additional reinforcement being connected to the first portion.

[0025] In one embodiment of the invention, the thickness of the acoustic layer material on the additional reinforcement, at the end of the relief opposite the upper wall of the first part, is between 5 and 20 mm, preferably on the order of 10 mm.

[0026] The invention further relates to a vehicle comprising:

[0027] -a floor structure comprising

[0028] - a first substantially horizontal floor wall comprising an edge front and rear edges extending respectively substantially transversely to the vehicle,

[0029] - second floor wall connected to the first floor wall by the edge forward of the first floor wall, extending towards the front of the vehicle and being substantially inclined upwards from the front edge of the first floor wall,

[0030] the vehicle comprising a false floor according to the invention, the first part of which rests on the first floor and the second part on the second floor, respectively on the side opposite the upper face of the first and second parts.

[0031] The invention also relates to a method of manufacturing a false floor according to the invention. DETAILED DESCRIPTION

[0032] The invention will be better understood upon reading the following description, given solely by way of example and made with reference to the accompanying drawings, in which:

[0033] [Fig-1] represents a sectional view of a false floor according to the invention.

[0034] [Fig.2] shows in section a false floor according to the invention, placed on the floor of the vehicle.

[0035] [Fig.3] represents in section of a false floor according to a variant of the invention.

[0036] [Fig.4] schematically represents in perspective a top view of the area of ​​the vehicle including the false floor.

[0037] In the following description, the term "include" is synonymous with "include" and is not limiting in that it permits the presence of other elements. It is understood that the term "include" includes the terms "consist of". In the various figures, the same reference numerals designate identical or similar elements.

[0038] The X direction is the longitudinal axis of the vehicle in running order, oriented from the front of the vehicle to the rear of the vehicle

[0039] The Y direction is the transverse direction of the vehicle in running order.

[0040] The Z direction is the vertical of the vehicle oriented upwards.

[0041] Figure 1 represents a sectional view along an XZ plane of a false floor installed in the vehicle, at the level of the front floor on the driver's side in the case of a left-hand drive vehicle. The section is made in a vertical longitudinal plane passing through the brake pedal or the accelerator pedal.

[0042] Figure 1 represents a false floor 100 according to the invention, the false floor 100 being intended to rest on a vehicle floor 2; in other words, the false floor 100 rests on the floor 2, the false floor 100 being positioned behind the pedal assembly in the vehicle configuration. The vehicle floor 2 is not shown in Figure 1.

[0043] The false floor 100 comprises:

[0044] - a first part 3 comprising a first upper face 31 in a first plan,

[0045] - a second part 4 comprising a second upper face 41 extending in a plane inclined with respect to the first upper face, the salient angle between the first face 41 and the second face 42 being obtuse,

[0046] - a projecting part on the side of the first 31 and second 41 upper faces of the false floor 100, between the first part 3 and the second part 4, forming a heel support 5,

[0047] the false floor 100 comprising an acoustic layer 7, extending at the level of the first 3, second 4 parts and the heel support 5, and a reinforcement 8 of expanded material in the acoustic layer 7 and extending into the heel support 5 and into the first part 1, the reinforcement 8 comprising zones of different density.

[0048] In one embodiment of the invention, the acoustic layer is made of a foam-type material. In a preferred embodiment of the invention, the acoustic layer 7 is made of polyurethane foam with a density of approximately 50 g / 1.50 grams per liter.

[0049] In other words the heel support 5 is disposed between the first part 3 and the second part 4.

[0050] As shown in [Fig. 1], the heel support 5 has a first upper face 51 connected to an edge of the upper face 31 of the first part 3. The heel support 5 further has a second upper face 52 connected to the upper face of the second part 4. The first upper face 51 of the heel support extends from a front edge, in vehicle position, of the upper face 31 of the first part 3, the first upper face 51 making an obtuse angle with the upper face 31 of the first part 3.

[0051] The second upper face 52 is connected, in vehicle position, to a rear edge of the upper face 41 of the second part 4. The second upper face 52 projects upwards in vehicle position, relative to the upper face 41 of the second part 4. As shown in [Fig.1], the angle between the upper face 41 of the second part and the upper face 52 of the heel support 5 is substantially a right angle or is substantially an angle of 120 degrees.

[0052] Thus, the heel support 5 is able to resist rearward movement of the occupant's heel in a vehicle configuration, the occupant's heel being positioned above the second part 4, and the heel support 5 being projecting behind the heel in a vehicle configuration. The heel support 5 comprises a second portion 82 of the reinforcement 8 made of expanded material, said reinforcement 8 of expanded material providing rigidity to the false floor 100, and the second portion 82 providing rigidity to the heel support 5.

[0053] The reinforcement 8 comprises a first portion 81 and a second portion 82, the density of the first portion 81 being at least two times less than that of the second portion 82. In a preferred embodiment of the invention the density of the first portion 81 being at least three times less than that of the second portion 82.

[0054] In a preferred embodiment of the invention, the reinforcement 8 is made of expanded polystyrene and the density of the first portion 81 is approximately 30 g / 1.30 grams per liter.

[0055] Thus the second portion 82, being denser, provides more rigidity than the first portion 81.

[0056] As represented in [Fig.1], the first portion 81 is connected to the second portion 82 so as to constitute a continuous reinforcement.

[0057] In other words, a second portion 82 of the reinforcement 8 is in line with the first portion 81 of the reinforcement 8 made of expanded material.

[0058] In a variant of the invention, the first portion 81 of the reinforcement 8 is disposed in the acoustic layer 7 of the first part 3, the second portion 82 being disposed in the acoustic layer 7 of the heel support 5.

[0059] In a variant of the invention not shown in the figures, the second portion 82 is disposed solely within the heel support 5, being enveloped by the acoustic layer of the heel support, and the first portion 81 is disposed only in the first part 3. Thus in this variant the second portion 82 whose density is higher than that of the first portion 81 is disposed only in the heel support.

[0060] As represented in [Fig. 1], the second portion 82 is disposed in the acoustic layer 7 of the heel support 5 and includes an extension 821 in the acoustic layer 7 of the first part 3. The extension 821 is substantially of the same density as the second portion 82.

[0061] Thus the extension 821 provides additional rigidity to the area of ​​the first part 3 in which the extension 821 is disposed.

[0062] In other words, the reinforcement 8 in this variant includes an extension 821 which is arranged within the first part, and which is connected to the first portion 81. In the representation of [Fig.1], the extension 821 is continuously connected with the first portion 81.

[0063] As shown in [Fig.1], the thicknesses of the extension 821 and the first portion 81 are substantially identical.

[0064] In vehicle situation, said thickness of portion 81 corresponds to the vertical direction of the vehicle at the level of the first part 81, the upper face of which is substantially horizontal in vehicle situation.

[0065] In a variant of the invention, the thickness of the reinforcement 8 in the heel support is greater than the thickness of the reinforcement 8 in the first part, so as to create the protruding part, and thus to form a retaining support behind the heel in vehicle situation.

[0066] In other words, the thickness of the second portion 82 is greater than the thickness of the first portion 81

[0067] As shown in [Fig.1], the thickness of the extension is substantially identical to the thickness of the first portion 81.

[0068] Thus, the thickness of the second portion 82 being greater than the thickness of the extension 821 or of the first portion 81, and the density of said second portion 82 being also greater than that of the first portion 81, means that the heel support 5 comprising this second portion 82 is more able, by virtue of the rigidity provided by the reinforcement 82 in expanded material, to oppose a displacement of the heel towards the rear in vehicle situation.

[0069] The first part 3 further comprises a relief 6 extending over a lower face 32 on the side opposite the upper face 31, projecting from this lower face 32. Said relief 6 extends from an edge of the first part 3 opposite the second part 4, preferably the relief 6 is included in the layer of foam-type material.

[0070] In other words, the relief 6 constitutes a foot intended to come to rest against the wall 21 of the floor 2.

[0071] The relief 6 has a lower face 62. The first part 3 has a fraction 33 of its lower face 32, arranged between the relief 6 and the heel support 5. The lower face 62 of the relief 6 is arranged lower in the vehicle position than the fraction 33 of the lower face 32 of the first part 3. In the vehicle position, the fraction 33 is thus arranged at a distance from the floor, defining a cavity 9 between the heel support 5 and the relief 6.

[0072] The [Fig.2] is a section of the false floor 100 arranged on a vehicle floor 2, made in the same plane XZ as the [Fig.1].

[0073] In a variant of the invention represented in [Fig.2], the cavity 9 includes a ventilation duct 91. In vehicle position the ventilation duct 9 is disposed between the fraction 33 of the lower face 32, the relief 6, the part 21 of the floor 2, and the heel support 5.

[0074] In other variants not shown, cavity 9 contains wiring harnesses and / or electrical equipment of the vehicle.

[0075] In a variant of the invention, the false floor 100 according to the invention, comprises an additional reinforcement 83 in expanded material and disposed in the acoustic layer 7, forming part of the volume of the relief 6, said additional reinforcement 83 being in the same material and substantially of the same density as the first portion 81.

[0076] In a variant not shown in [Fig.3], the additional reinforcement 83 is connected to the first portion 81.

[0077] As shown in [Fig.2] or [Fig.3], the additional reinforcement 83 contributes to the rigidity of the relief 6 which thus constitutes a foot of the false floor 100 in vehicle situation.

[0078] The additional reinforcement 83 is disposed within the acoustic layer 7, with a thickness of acoustic layer remaining between the lower face 62 and the lower face of the additional reinforcement 83.

[0079] The thickness of the acoustic layer between the lower face 62 and the lower face of the additional reinforcement 8 is between 5 and 20 millimeters.

[0080] In one variant of the invention, the acoustic layer thickness is substantially between 7 and 15 millimeters.

[0081] In one embodiment of the invention, the raised floor 100 comprises, on its upper surface, a mat 10 having a heavy mass layer and a coating layer. The heavy mass layer of the mat 10 is disposed on the acoustic layer 7 and is formed of a viscoelastic material; the coating layer is bonded to the heavy mass and disposed on the heavy mass opposite the acoustic layer.

[0082] Thus, the coating layer is visible to an occupant in the passenger compartment. The surface layer is formed by a surface material, for example carpet, or by a protective material, preferably waterproof for other applications in commercial vehicles.

[0083] As shown in [Fig.2] or 3, the false floor 100 has a reinforcement 8 and above it a thickness of acoustic layer, the mat 10 being arranged above, in vehicle situation, said acoustic layer 7, the thickness of the acoustic layer 7 between the upper face of the reinforcement 8 and the lower face of the mat 10 being between approximately 5 and 20 millimeters.

[0084] In other words, the thickness of the acoustic layer 7 is approximately between 5 and 20 mm between the upper face of the reinforcement 8 and the upper face of the acoustic layer 7.

[0085] Similarly, the false floor 100 includes between the upper face of the additional reinforcement 83 and the upper face of the false floor a thickness of acoustic layer, the acoustic layer being in a variant made of foam, of substantially between 5 and 20 mm, or in a variant of the invention the thickness of the acoustic layer between the upper face of the additional reinforcement 83 and the upper face of the false floor is of substantially between 7 and 15 millimeters.

[0086] In other words, the reinforcement 8 is covered and wrapped in the acoustic layer by being inserted into the acoustic layer 7.

[0087] In one embodiment of the invention the heavy mass is formed in a material of density at least 3 times greater than that of the acoustic layer 7.

[0088] The invention also relates to a vehicle comprising:

[0089] - floor 2 comprising

[0090] - a first floor wall 21 substantially horizontal and having an edge front and rear edges extending respectively substantially transversely to the vehicle,

[0091] - a second floor wall 22 connected to the first floor wall 21 by the front edge of the first floor wall, the second floor wall 22 extending towards the front of the vehicle being substantially inclined upwards from the front edge of the first floor wall 21, the vehicle comprising a false floor 100 according to the invention, the second part 4 of which rests on the first floor wall 21 and the heel rest rests on the second floor wall 22, respectively on the side opposite the upper face of the first and second parts.

[0092] As shown in [Fig.2] or 3, the vehicle includes a false floor 100, the first part of which 3 includes a relief 6, the lower face 62 of the relief 6 resting against the upper face of the floor wall 21.

[0093] The first part 3 comprises a fraction 33 of its lower face 31, arranged between the relief 6 and the heel support 5. The lower face 62 of the relief 6 is arranged lower in the vehicle configuration than the fraction 33 of the lower face 31 of the first part 3. In the vehicle configuration, the fraction 33 is thus arranged at a distance from the floor, defining a cavity 9 between the heel support 5, the relief 6 and the floor wall 21. As shown, a ventilation duct 91 is arranged in the cavity 9.

[0094] As shown in [Fig. 2] or 3, the vehicle comprises a cross member 11 having a front transverse wall 111 extending in a substantially transverse and vertical plane of the vehicle. The false floor 100 comprises a rear edge 311 disposed substantially transversely and vertically against the front wall 111 of the cross member 10, the rear edge 311 bearing against the wall IL

[0095] As shown in [Fig. 2], the relief 6 includes an additional reinforcement 83, the rear edge of which is substantially arranged transversely and vertically to the vehicle. A thickness of the acoustic layer, in one embodiment of the invention said acoustic layer being made of foam, of substantially between 5 and 20 mm, is disposed between the rear edge of the additional reinforcement 83 and the front edge 111 of the cross member 11. When a force is exerted on the heel support 5 towards the rear of the vehicle, the rear edge of the additional reinforcement 83 compresses the foam and comes to rest against the edge 111 of the cross member 11. Thus, the additional reinforcement 8 contributes, by virtue of the added rigidity, to the fact that the rearward movement of the false floor 100 is restrained by the front wall 111 of the cross member 11.

[0096] Thus, during longitudinal forces exerted from the front to the rear of the vehicle, by the heel on the heel support 5, due to the presence of the reinforcements 8, i.e. 81, 82 and 83, the movements of the heel during a shock are retained longitudinally by the heel support 5 and by reaction through the cross member 11.

[0097] In another variant of the invention not shown, the acoustic layer 7 is composed of felt-type materials.

[0098] Fig. 4 schematically represents a perspective view of the false floor 100 from the point of view of an observer in the passenger compartment.

[0099] The ventilation duct 91 is represented by a series of short dashes. The duct 91 extends from the tunnel 92, being substantially perpendicular to the longitudinal direction of the vehicle at the level of the tunnel 92. The duct 91 is substantially oriented along the longitudinal direction of the vehicle at the level of the crossmember 11.

[0100] As shown in [Fig.4], the false floor 100 extends longitudinally to the vehicle from an area located in front of the heel support 5, substantially near the passage of the steering column not shown in [Fig.4], to the cross member 11.

[0101] The false floor 100 extends in the transverse direction of the vehicle between the tunnel 92 and the side member 94 of the vehicle or the footrest 95. The acoustic layer 7 and the carpet part 10, comprising the coating layer and the heavy mass part, extend transversely over the tunnel 92 and the side member 94 so as to cover the tunnel 92 and the side member 94.

[0102] The acoustic layer 7 and the carpet part 10 extend in front of the reinforcement 8 of the floor 100 to the deck area 93 stopping substantially longitudinally at the level of the passage of the steering column.

[0103] The volume occupied by the reinforcement 8 is schematically represented by a dashed line with alternating dots and lines. The reinforcement 8 extends under the heel support 5, by its second portion part 82. The reinforcement 8 extends longitudinally in the vehicle position up to the cross member 11, the cross member 11 not being shown in [Fig.4]. In [Fig.4], the variant shown of the reinforcement 8 includes a first portion 81 which is connected to the reinforcement portion 82. The reinforcement 8, and therefore its portions 81, 82 and the additional reinforcement 83, extends transversely between the tunnel 92 and the side member or the footrest 95. An acoustic layer thickness 7 of between 5 and 20 millimeters, or between 7 and 12 mm, extends above the portions 81, 82, and the additional reinforcement 83 and also above the tunnel 92 or the side member 94.

[0104] The vehicle further comprises a footrest 95 disposed along the side member 94 transversely opposite the heel rest 5. The heel rest 5 is disposed along the tunnel 92, so as to be positioned opposite the pedals closest to the tunnel. In other words, the heel rest 5 is disposed, for a left-hand drive vehicle, longitudinally and rearward opposite the accelerator and / or brake pedals, near the tunnel 92, on the inside, and away from the side member 94 located on the outside of the vehicle.

[0105] In an alternative embodiment not shown, the vehicle has right-hand drive, the brake and accelerator pedals are located on the exterior side of the vehicle near the side member and away from the tunnel 92, the false floor 100 having a heel rest 5 and a reinforcement 8 according to the invention, the heel rest being located behind said accelerator and brake pedals. In other words, in the variant of a vehicle with right-hand drive, the heel rest 5 is located near the side member on the exterior side of the vehicle.

[0106] In the variant shown in [Fig. 4], the footrest 95 is positioned below the mat 10, which comprises a visible, heavy-mass coating layer and an acoustic layer 7. The reinforcement 8 and the portion of the acoustic layer located beneath the reinforcement and bearing on the floor extend transversely to a vertical limit of the footrest. The portion of the reinforcement 8 located behind the footrest 95 extends transversely between the tunnel 92 and the side member 94.

[0107] The invention further relates to a method for manufacturing the false floor 100 comprising the following steps: - An optional first step of inserting the carpet layer into a mold, with the visible layer positioned against the mold walls, - A second stage of projecting and / or injecting foam or felt onto the underside of the carpet layer, so as to constitute a first zone of the acoustic layer, - A third step of inserting the reinforcement 8 in expanded material or of projecting and / or injecting the expanded material, so as to constitute the reinforcement 8, - A fourth stage of projection and / or injection of foam or felt onto the reinforcement 8, so as to finalize the realization of the acoustic layer 7.

[0108] Said process includes, in the case of the projection and / or injection of the expanded material, means of control and command of the quantity of expanded material, so as to obtain a reinforcement 8 with different density zones.

[0109] In one embodiment of the invention, the second and third steps are carried out almost simultaneously.

[0110] The invention also relates to a low-cost manufacturing variant of the false floor 100 in which the density of the second portion 82 of the reinforcement 8 is substantially identical to the density of the portion 81.

[0111] The invention also relates to a vehicle false floor 100 in which the density of the second portion 82 of the reinforcement 8 is substantially identical to the density of the portion 81. In the case where this variant is intended for a utility vehicle, the carpet coating layer is made of easily cleanable, waterproof plastic-type material.

Claims

Demands

1. A vehicle subfloor (100) intended to rest on a vehicle floor structure (2), said subfloor (100) comprising: - a first part (3) comprising a first upper face (31) in a foreground, - a second part (4) comprising a second upper face (41) extending in a plane inclined relative to the first upper face (31), the salient angle between the first face (31) and the second face (41) being obtuse, and - a projecting part on the side of the first (31) and second (41) upper faces of the false floor (100), between the first part (3) and the second part (4), forming a heel support (5), the false floor (100) comprising an acoustic layer (7), preferably of foam-type material, extending at the level of the first (3), second (4) parts and the heel support (5), and a reinforcement (8) of expanded material in the acoustic layer (7) and extending into the heel support (5) and into the first part (3), said false floor (100) being characterized in that: - the reinforcement (8) comprises a first portion (81) and a second portion (82), the density of the first portion (81) being at least twice that of the second portion (82), preferably the density of the first portion (81) being at least three times that of the second portion (82), - the first part (3) comprises a relief (6) extending over a lower face (32) on the side opposite the upper face (31), projecting from this lower face (32), extending from an edge of the first part (3) opposite the second part (4), the relief (6) being included in the layer of foam-type material, and - the false floor (100) comprises a supplementary reinforcement (83), made of expanded material, disposed in the acoustic layer (7), forming part of the volume of the relief (6), said supplementary reinforcement (83) being made of the same material and substantially of the same density as the first portion (81).

2. False floor according to claim 1, wherein the first portion (81) is connected to the second portion (82) so as to constitute a continuous reinforcement.

3. False floor (100) according to claim 2, wherein the first portion (81) is disposed in the acoustic layer of the first part (3), the second portion (82) being disposed in the acoustic layer of the heel support (5).

4. False floor (100) according to any one of claims 2 or 3, wherein the second portion (82) is disposed in the acoustic layer of the heel support (5) and includes an extension (821) in the acoustic layer of the first portion (3), the second portion (82) and the extension (821) being substantially of the same density.

5. False floor (100) according to any one of the preceding claims, wherein the thickness of the reinforcement (8) in the heel support is greater than the thickness of the reinforcement in the first part, so as to create the projecting part.

6. False floor (100) according to any one of the preceding claims, wherein the additional reinforcement (83) is connected to the first portion (81).

7. False floor (100) according to claim 1 in which the thickness of material of the acoustic layer on the additional reinforcement (83), at the end of the relief opposite the upper face (31) of the first part, is between 5 and 20 mm, preferably on the order of 10 mm.

8. Vehicle comprising: - a floor structure (2) comprising - a first floor wall (21) substantially horizontal and having a front edge and a rear edge extending respectively substantially transversely to the vehicle, - a second floor wall (22) connected to the first floor wall (21) by the front edge of the first floor wall, extending towards the front of the vehicle being substantially inclined upwards from the front edge of the first floor wall (21), and - the vehicle comprising a false floor (100) according to any one of claims 1 to 7, the first part (3) of which rests on the first floor wall (21) and the second part (4) on the second floor wall (22), respectively on the side opposite the upper face (31, 41) of the first (3) and second (4) parts.

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