floor assembly for motor vehicle

Abstract

The invention relates to a gusset plate (13) for an end cross member (12A) of a floor assembly (1), the gusset plate (13) comprising a U-shaped base and, at an axial end of the base, a fixing lug (131) which extends from a first lateral side of the base and a flanged edge (14) which extends from the other side of the base. The flanged edge (14) is smaller than the fixing lug (131), at least in the direction perpendicular to the main elongation direction of the gusset plate (13). The invention also relates to a floor assembly (1) comprising a floor (11) delimited by a raised peripheral edge and supported by several lateral crosspieces and at least one end crosspiece (12A) equipped with such an end gusset (13) which extends opposite and at a distance from the raised peripheral edge (111), in direct proximity to a rounded corner (112) of said raised peripheral edge. Figure to be published with the abstract: Fig. 3

Description

Title of the invention: Floor assembly for motor vehicle

[0001] The technical context of the present invention is that of structural elements of a motor vehicle, and more particularly those which make it possible to guarantee the rigidity of the motor vehicle chassis, in particular in the event of a side impact. More particularly, the invention relates to a floor assembly for a motor vehicle.

[0002] In the state of the art, motor vehicles are known comprising a floor extending under the passenger compartment. The floor is stretched between the two side rails of the motor vehicle, and supported by side cross members which make it possible to reinforce the floor with regard to the load imposed by the passenger compartment equipment fixed to said floor on the one hand, but also to reinforce the floor and the side rails in the event of a side impact of the motor vehicle on the other hand.

[0003] In a known manner, such side cross members extend between the side rails, across the floor. The side cross members form prismatic spans inside which, at their ends, gussets are fitted. Each gusset has fixing lugs which extend laterally on either side of said gusset and on either side of the side cross member with which it is associated. These fixing lugs thus provide a support surface complementary to the surface of the floor located opposite, and against which each side cross member - through its gusset - is fixed securely by welding.

[0004] Of course, for the lateral crossmembers located in the middle position of the floor, relative to a longitudinal axis of elongation of the floor, the shape of the peripheral edge of the floor, and that of the lateral side member located opposite, are rectilinear, making the complementarity of the shapes of the gusset plate easy to obtain with respect to the peripheral edge of the floor, as well as their fixing. On the other hand, for the end crossmembers located at a front part or a rear part of the peripheral edge of the floor, this complementarity of shape is not easy to obtain. Indeed, at these front and rear parts, the peripheral edge of the floor has a rounded corner, thus forming a curved surface which is difficult to obtain precisely at the gusset plate itself.

[0005] Also, in known floor assemblies, the gussets associated with the end crosspieces do not have a fixing lug on the side of the rounded corner of the peripheral edge of the floor, unless said lateral crosspieces are positioned sufficiently far from the front edge or the rear edge of the floor. Of course, these situations are not satisfactory because they do not allow for optimal behavior of the floor in the event of a side impact. In particular, in the event of a side impact, the force exerted by the side member on the end cross member is transmitted to its gusset plate at its mounting bracket, on the side of the middle part of the floor, and not in a balanced manner on either side of the end cross member. This results in an unbalanced force at the end cross member, leading to reduced performance and increased risks of breakage or damage.

[0006] The object of the present invention is to propose a new floor assembly in order to address at least a large part of the above problems and to further lead to other advantages.

[0007] Another aim of the invention is to reinforce such a floor assembly more effectively, particularly in the event of side impacts.

[0008] Another object of the invention is to better balance the forces transmitted by the lateral crosspiece, on either side of the end gusset.

[0009] According to a first aspect of the invention, at least one of the aforementioned objectives is achieved with a floor assembly for a motor vehicle, the floor assembly comprising:

[0010] - two lateral side members extending along a longitudinal axis;

[0011] - a floor extending between the two side members, the floor comprising a raised peripheral edge forming a rebate for fixing to the side rails;

[0012] - a plurality of lateral cross members all extending under the floor and along an axis transverse perpendicular to the longitudinal axis, each lateral crosspiece having an end cap located opposite the raised peripheral edge of the floor;

[0013] - gussets associated with each end piece of the side crosspieces, said gussets comprising a base fitted into the end piece of the corresponding side crosspiece and at least one fixing lug which projects from the base so as to form a bearing surface against the raised peripheral edge.

[0014] According to the invention, at least one of the lateral crosspieces located closest to an end edge of the raised peripheral edge, chosen from a front edge and / or a rear edge of said raised peripheral edge - called end crosspiece - comprises a fallen edge extending from the base opposite the fixing lug, the fallen edge extending opposite the raised peripheral edge on the side of the end edge.

[0015] In the context of the present invention, a longitudinal axis, a lateral axis and a vertical axis are defined relative to the motor vehicle on which the floor assembly according to the first aspect of the invention is intended to be mounted. More particularly, the transverse axis is understood as a direction taken between a lateral side of the motor vehicle and an opposite lateral side of said motor vehicle. In other words, the transverse axis is understood in a direction which extends from a passenger side of the motor vehicle to a driver's side of said vehicle at motor vehicle, or vice versa. The adjectives lateral, interior, and exterior refer to such a transverse axis. Furthermore, the longitudinal axis extends as taken along a direction that runs from front to back or from back to front of the motor vehicle. The longitudinal axis is perpendicular to the transverse axis. The adjectives frontal, front, and rear refer to this longitudinal axis. Finally, the vertical axis is understood to be taken along an axis that runs from the wheels of the motor vehicle and toward the roof of said motor vehicle, or vice versa, the vertical axis being simultaneously perpendicular to the transverse axis and the longitudinal axis. The adjectives above and below, or lower and upper refer to this vertical axis.

[0016] In the context of the present invention, the lateral side member forms a prismatic span which extends relative to the longitudinal axis of the motor vehicle, at each lateral edge of said motor vehicle. The lateral side members form structural elements of the motor vehicle to which other parts of the motor vehicle are attached. The lateral side members thus provide the rigidity necessary for the operation of the motor vehicle, during driving sequences, but also in the event of an accident in order to transmit the forces resulting from said impact towards absorption devices or towards the running gear of the motor vehicle, for example. The lateral side members are generally formed from steel profiles giving the body structure its robustness.

[0017] In the context of the present invention, the floor forms a stamped sheet metal which extends laterally between the side rails and, from front to rear, between a heel board and a rear cross member. The floor is mainly flat and is encircled by a peripheral edge which forms a raised edge allowing attachment to each side rail in particular. The raised edge takes the form of a rebate which extends at a non-zero angle relative to the general plane of the floor. In particular, the peripheral edge of the floor forms a clearance angle with the general plane of the floor of between approximately 70° and 120°. The floor is preferably fixed integrally to the side rails by a plurality of attachment points distributed along its rebate. In the context of the present invention, the raised peripheral edge has a generally rectangular shape.At least the raised peripheral edge of the floor is delimited, towards the front, by a front edge which extends between the two side rails and, towards the rear, by a rear edge which extends between the two side rails. Near each side rail, the front edge and the rear edge of the raised peripheral edge have a fillet forming a curved surface.

[0018] In the context of the present invention, each lateral cross member is a beam - preferably rectilinear, possibly curved - which extends mainly along the transverse axis. The lateral cross members are fixed integrally by their lateral ends to the lateral side members and to the peripheral edge of the floor of the floor assembly according to the invention. The side cross members thus form a spacer device for the side rails. The floor assembly according to the invention advantageously comprises several side cross members connecting the side rails, the side cross members being distributed along the longitudinal axis. Each side cross member thus provides the rigidity necessary for the operation of the motor vehicle, during driving sequences, but also transmits the mechanical forces resulting from an impact to each side rail and to the body structure of the motor vehicle. Each side cross member is generally formed from a steel profile having a U-shaped profile or rectangular section.

[0019] In the context of the present invention, a distinction is made, among the side cross members, between the end cross members which are located furthest forward or furthest rearward. In the context of the invention, the floor assembly may comprise a single end cross member, located at the front or rear of the floor, or two end cross members. The end cross member is located in direct proximity to the front edge or the rear edge of the floor, i.e. at a distance less than or substantially equal to a dimension of the fixing lug of the gusset plate associated with one of the side cross members, taken along the longitudinal axis.

[0020] Each side crosspiece and each end crosspiece are formed from a particularly rigid metallic material, such as for example comprising steel or a steel alloy.

[0021] In the context of the present invention, the gusset plate forms an assembly part fitted into one of the side crosspieces at its end. Each gusset plate thus forms a closing part for the side crosspiece. Each gusset plate extends opposite the peripheral edge of the floor, the gusset plate comprises a base which takes the form of a prismatic bearing surface with a shape complementary to that of the side crosspiece, so as to be able to be introduced into said prismatic bearing surface, or associated with it. In particular, by way of non-limiting example, the base of the gusset plate has a transverse profile in the shape of a “U”. The gusset plate is formed from a less rigid material than that used for the side crosspieces. By way of non-limiting example, the gusset plate is formed from a material comprising steel or a steel alloy.The gusset plate is cold stamped to give it the expected shape complementary to that of the side or end cross member with which it is intended to be associated.

[0022] Thus, each gusset is fitted to the end of the side cross member or the associated end cross member, and the fixing lug(s) of said gusset are fixed integrally to the raised peripheral edge of the floor and / or to the side member located opposite, preferably by welding and / or by riveting.

[0023] In the context of the present invention, the gusset of each side cross member and each end cross member now comprises two devices allowing the fixing from the gusset to the raised peripheral edge of the floor and to the side member located opposite:

[0024] - two fixing brackets for the side crosspieces,

[0025] - a fixing lug and a raised edge for the end crosspieces.

[0026] Thus, the invention allows for better collaboration of all the cross members - lateral or end - with the lateral side members and the raised peripheral edge of the floor. Indeed, the presence of the raised edge on the other side of the fixing lug with respect to the base allows for a force to be taken up on either side of the end cross member, despite the presence in direct proximity of the rounded corner of the raised peripheral edge. Of course, the dimensions of the raised edge of the gusset of the end cross member, taken in a plane parallel to the bearing surface against the raised peripheral edge of the floor, are smaller than those of the corresponding fixing lug of said gusset.

[0027] The floor assembly according to the first aspect of the invention advantageously comprises at least one of the improvements below, the technical characteristics forming these improvements being able to be taken alone or in combination:

[0028] - the fallen edge is located at a distance from the raised peripheral edge of the floor, rela tively to the transverse axis. In particular, there is a non-zero transverse clearance between the raised edge and the raised peripheral edge of the floor. The transverse clearance is preferably greater than a few millimeters. In particular, the transverse clearance is between 3 mm and 5 mm, preferably equal to 4 mm. This advantageous configuration allows for support against the peripheral edge in the event of the side member being pushed in, thus allowing symmetrical force absorption on either side of the end cross member;

[0029] - in the case where the end cross member is located at the front of the floor assembly and located near the front edge of said floor, then the flanged edge is located in front of the gusset plate, relative to the longitudinal axis. Conversely, in the case where the end cross member is located at the rear of the floor assembly and located near the rear edge of said floor, then the flanged edge is located behind the gusset plate, relative to the longitudinal axis;

[0030] - relative to the longitudinal axis, the fallen edge is located at a distance from the edge end to which it is associated less than or equal to the width of the fixing lug, taken along the longitudinal axis.

[0031] - the fallen edge has a surface opposite the raised peripheral edge completed mentary of the part of the raised peripheral edge located directly opposite. Thus, if the part of the raised peripheral edge located directly opposite is flat, then the fallen edge is flat. On the other hand, if the part of the raised peripheral edge located directly opposite is flat, then the fallen edge is flat. directly opposite is curved, for example concave or convex, then the fallen edge is curved, respectively concave or convex. This complementarity of shape advantageously makes it possible not to perforate the raised peripheral edge in the event of a side impact, by offering a better distribution of forces;

[0032] - the fallen edge of the gusset plate associated with the end crosspiece takes the form of a fixing lug of smaller dimension than the fixing lug associated with said gusset;

[0033] - in particular, the fallen edge has a width, taken perpendicular to the base, less than that of the fixing lug. More generally, the width of the flanged edge is taken along the longitudinal axis, that is to say perpendicular to the axis of elongation of the corresponding end crosspiece. By way of non-limiting example, the width of the flanged edge is less than half the width of the fixing lug, for example between 5 mm and 20 mm, preferably equal to 15 mm;

[0034] - the dropped edge has a height, taken along the base, less than or equal to that of the fixing lug. More generally, the height of the flanged edge is taken along the vertical axis, that is to say perpendicular to the axis of elongation of the corresponding end crosspiece. As a non-limiting example, an upper edge of the flanged edge is located below an upper edge of the fixing lug. For example, the height of the flanged edge is between 35 mm and 50 mm, preferably equal to 45 mm;

[0035] - the fallen edge has a generally rectangular shape;

[0036] - the rectangular shape of the fallen edge has a fillet. The fillet forms a rounded to prevent the rectangular shape, once in contact with the raised peripheral edge of the floor, from tearing it;

[0037] - according to a first variant embodiment, the fallen edge has a thickness identical to that of the fixing lug. According to a second variant embodiment, the fallen edge has a thickness greater than or equal to that of the fixing lug;

[0038] - the fallen edge is made from the same material as the base of the gusset. In the context of the present invention, by “made from material”, it is understood that the flanged edge and the base are made from the same manufacturing process and that they cannot be detached from each other without one and / or the other being entirely or partially damaged or destroyed. In particular, the flanged edge, the base and the fixing lug of the gusset plate associated with the end crosspiece are obtained by cold stamping;

[0039] - the fallen edge is not fixed securely to the raised peripheral edge of the floor, nor to the side rail located opposite. In fact, due to the distance and the curved shape of the peripheral edge of the floor at its front edge or its rear edge, it is not possible to carry out a fixing by welding. Also, the fallen edge forms a support surface forming a force recovery in the event of the side rail being pushed inwards, relative to the longitudinal axis. In other words, the floor assembly includes areas for fixing the side cross members and the end cross member(s) which are all located on the - or associated with the - fixing lugs, and not on the - or associated with the - flanged edge. The flanged edge only forms a force-recovery surface which is located opposite and at a distance - relative to the transverse axis - from the raised peripheral edge. The flanged edge is only supported if the side member is pushed inwards, following a side impact for example, and thus makes it possible to obtain symmetrical or more balanced support on the associated end cross member.

[0040] According to a second aspect of the invention, there is provided a motor vehicle comprising a floor assembly in accordance with the first aspect of the invention or according to any of its improvements.

[0041] Various embodiments of the invention are provided, integrating according to all of their possible combinations the different optional characteristics set out here.

[0042] Other characteristics and advantages of the invention will become apparent from the following description on the one hand, and from several exemplary embodiments given for informational and non-limiting purposes with reference to the attached schematic drawings on the other hand, in which:

[0043] [Fig-1] illustrates a perspective view of an exemplary embodiment of the floor assembly according to the first aspect of the invention;

[0044] [Fig.2] illustrates a first detailed view of the floor assembly illustrated in the [Fig.l];

[0045] [Fig.3] illustrates a second detail view of the floor assembly illustrated in the [Fig.l];

[0046] [Fig.4] illustrates a detail view of the gusset plate associated with the visible end cross member in FIGURES 1 to 3.

[0047] Of course, the features, variants and different embodiments of the invention may be combined with each other, in various combinations, provided that they are not incompatible or mutually exclusive. In particular, variants of the invention may be imagined comprising only a selection of features described below in isolation from the other features described, if this selection of features is sufficient to confer a technical advantage or to differentiate the invention from the prior art.

[0048] In particular, all the variants and all the embodiments described can be combined with each other if nothing prevents this combination from a technical point of view.

[0049] In the figures, the elements common to several figures retain the same reference.

[0050] In the FIGURES described below, a longitudinal axis X, a lateral axis and a vertical axis Z are defined relative to the floor assembly 1 according to the invention. More particularly, the transverse axis Y is understood as a direction taken between a lateral side of the motor vehicle and an opposite lateral side of said motor vehicle. In other words, the transverse axis Y is understood in a direction which extends from a passenger side of the motor vehicle to a driver's side of said motor vehicle, or vice versa. The adjectives lateral, interior and exterior refer to such a transverse axis Y.

[0051] Furthermore, the longitudinal axis X extends as taken along a direction that extends from front to rear or from back to front of the motor vehicle. The longitudinal axis X is perpendicular to the transverse axis Y. The adjectives frontal, front and rear refer to this longitudinal axis X.

[0052] Finally, the vertical axis Z is understood as being taken along an axis which extends from the wheels of the motor vehicle and towards the roof of said motor vehicle, or vice versa, the vertical axis Z being simultaneously perpendicular to the transverse axis Y and to the longitudinal axis X. The adjectives above and below, or lower and upper refer to this vertical axis Z.

[0053] With reference to FIGURES 1 to 3, the invention relates to a floor assembly 1 for a motor vehicle, the floor assembly 1 comprising:

[0054] - two lateral side members - not shown in the FIGURES - and extending along the longitudinal axis X;

[0055] - a floor 11 extending between the two side members, the floor 11 comprising a raised peripheral edge 111 forming a rebate for attachment to the side rails. The peripheral edge 111 typically projects from the floor 11 in an L shape, so that it can be easily attached securely to the side rail, preferably by welding;

[0056] - a plurality of lateral crosspieces 12 all extending under the floor 11 and according to a transverse axis Y perpendicular to the longitudinal axis X. The lateral crosspieces 12 thus form under-floor crosspieces 11, in order to support it and prevent it from sagging under the effect of its loading. Each lateral crosspiece 12 has an end cap located opposite the raised peripheral edge 111 of the floor 11. In the embodiment illustrated in the FIGURES, the end caps of the lateral crosspieces 12 form openings, for example of rectangular section;

[0057] - gussets 13 associated with each end piece of the lateral crosspieces 12. More particularly, each gusset 13 is fitted into the opening formed by the end piece of the corresponding lateral crosspiece 12. More particularly, the gussets 13 comprise:

[0058] - a base 132 which is fitted into the end piece of the crosspiece corresponding side 12. In particular, as visible in [Fig.4], the base 132 of the gusset 13 comprises two side walls which extend opposite each other, in parallel, in order to form a rectangular section similar and complementary to the opening of the end piece of the corresponding side crosspiece 12; and

[0059] - at least one fixing lug 131 which extends projecting from the base 132 of so as to form a bearing surface against the raised peripheral edge 111. The fixing lug 131 extends from the base 132 and in a direction perpendicular to the direction of fitting of the gusset 13 into the opening of the end piece of the lateral crosspiece 12.

[0060] The gusset 13 is obtained by cold stamping a metal sheet, preferably steel.

[0061] As can be seen in [Fig.l] in particular, the floor assembly 1 comprises several lateral cross members 12 which all extend parallel to each other between the two lateral side members and under the floor 11. The lateral cross members 12 extend along the transverse axis Y and are distributed along the longitudinal axis X between two end edges 113 of the raised peripheral edge 111 of the floor 11, respectively forming a front edge and a rear edge.

[0062] Also, the invention distinguishes two types of lateral crosspieces 12:

[0063] - the lateral crosspieces 12 which are located at the level of a middle part of the floor 11, relative to the longitudinal axis X; and

[0064] - the lateral crosspiece(s) 12 which are located near the end edges 113 of the floor 11, i.e. the side cross member 12 which is located furthest forward of the floor assembly 1 and / or the side cross member 12 which is located furthest rearward of said floor assembly 1. These latter side cross members 12 are called end cross members 12A in the context of the present invention.

[0065] In a particularly advantageous manner, in order to allow better distribution of the loads along the end crossmember 12A in the event of a side impact, the invention provides that the end crossmember 12A comprises a flanged edge 14 which extends from the base 132 and in a direction opposite the fixing lug 131 of the end crossmember 12A, the flanged edge 14 extending opposite the peripheral edge 111 raised on the side of the end edge 113.

[0066] Thus, the fallen edge 14 of the end crosspiece 12A extends towards the end edge 113 of the floor 11, so as to form a bearing surface located opposite the raised peripheral edge 111, close to a rounded corner 112 thereof. Indeed, in the embodiment illustrated in FIGURES 1 to 3, the raised peripheral edge 111 has a generally rectangular shape and comprises, at its corners, rounded corners 112, so as to form a continuous surface. This configuration is moreover imposed by the method for obtaining the floor 11, by em- stamping, which creates these rounded corners 112.

[0067] The disadvantage of these rounded corners 112 is that it prevented the side crosspieces 12 from being placed sufficiently close to the end edge 113 of the floor 11, imposing, due to this setback, an undesired lower rigidity near the front edge or the rear edge of the floor 11. To circumvent this problem, it was customary to cut one of the two fixing lugs 131 of a side crosspiece 12 in order to affix it as close as possible to the end edge 113 of the floor 11, the part of the side crosspiece 12 thus amputated being located on the side of the end edge 113. This configuration was not satisfactory because it involved poor transmission of forces to the side crosspiece 12.

[0068] The invention solves this technical problem by modifying the gusset 13 of the end crosspiece 12A by adding the flanged edge 14 in place of the fixing lug 131 which could have been located opposite the end edge 113 of the floor 11.

[0069] The flanged edge 14 is smaller than the fixing lugs 131, so that it can be placed opposite the peripheral edge 111 and without touching the end edge 113 located in direct proximity. For this purpose, the flanged edge 14 may be flat or curved, so as to reproduce the curvature of the rounded corner 112 located nearby, or even opposite. Typically, a width of the flanged edge 14 is less than that of the fixing lug 131 of the end crosspiece 12A.

[0070] Furthermore, since it is not possible to carry out welding in the direct environment of the rounded corner 112 of the floor 11, it is therefore not possible to securely fix the flanged edge 14 to the raised peripheral edge 111 of the floor 11. Also, the invention cleverly provides that the flanged edge 14 is located at a distance from the peripheral edge 111, so that there is an axial clearance, measured along the transverse axis Y, of a few millimeters, for example between 3 mm and 5 mm, preferably equal to 4 mm. Thus, the flanged edge 14 forms a support and force-recovery surface in the event of the lateral side member bending inwards, the raised peripheral edge 111 of the floor 11 coming to bear against the flanged edge 14 at the rounded corner 112 and thus allowing a better distribution of the forces on the end cross member 12A.

[0071] In summary, the invention relates to a gusset 13 for an end cross member 12A of a floor assembly 1, the gusset 13 comprising a U-shaped base 132 and, at an axial end of the base 132, a fixing lug 131 which extends from a first lateral side of the base 132 and a flanged edge 14 which extends from the other side of the base 132. The flanged edge 14 is smaller than the fixing lug 131, at least in the direction perpendicular to the main elongation direction of the gusset 13. The invention also relates to a floor assembly 1 comprising a floor 11 delimited by a raised peripheral edge 111 and supported by several lateral crosspieces 12 and at least one end crosspiece 12A equipped with such an end gusset 13 which extends opposite and at a distance from the raised peripheral edge 111, in direct proximity to a rounded corner 112 of said raised peripheral edge 111.

[0072] Of course, the invention is not limited to the examples which have just been described and numerous adjustments can be made to these examples without departing from the scope of the invention. In particular, the different characteristics, forms, variants and embodiments of the invention can be associated with each other in various combinations insofar as they are not incompatible or mutually exclusive. In particular, all the variants and embodiments described above can be combined with each other.

Claims

Claims

1. Floor assembly (1) for a motor vehicle, the floor assembly (1) comprising: - two lateral side members extending along a longitudinal axis (X); - a floor (11) extending between the two lateral side members, the floor (11) comprising a raised peripheral edge (111) forming a rebate for fixing to the lateral side members; - a plurality of lateral cross members (12) all extending under the floor (11) and along a transverse axis (Y) perpendicular to the longitudinal axis (X), each lateral cross member (12) comprising an end piece located opposite the raised peripheral edge (111) of the floor (11);- gussets (13) associated with each end piece of the lateral crosspieces (12), said gussets (13) comprising a base (132) fitted into the end piece of the corresponding lateral crosspiece (12) and at least one fixing lug (131) which projects from the base (132) so as to form a bearing surface against the raised peripheral edge (111); characterized in that at least one of the lateral crosspieces (12) located closest to an end edge (113) of the raised peripheral edge (111), chosen from a front edge and / or a rear edge of said raised peripheral edge (111) - called end crosspiece (12A) - comprises a fallen edge (14) extending from the base (132) opposite the fixing lug (131), the fallen edge (14) extending opposite the raised peripheral edge (111) on the side of the end edge (113).;

2. Floor assembly (1) according to the preceding claim, in which the fallen edge (14) is located at a distance from the raised peripheral edge (111) of the floor (11), relative to the transverse axis (Y).

3. Floor assembly (1) according to any one of the preceding claims, in which, relative to the longitudinal axis (X), the fallen edge (14) is located at a distance from the end edge (113) with which it is associated less than or equal to the width of the fixing lug (131), taken along the longitudinal axis (X).

4. Floor assembly (1) according to any one of the preceding claims, in which the fallen edge (14) has a width, taken perpendicular to the base (132), less than that of the fixing lug (131).

5. Floor assembly (1) according to any one of the preceding claims, in which the fallen edge (14) has a surface facing the raised peripheral edge (111) complementary to the portion of the raised peripheral edge (111) located directly opposite.

6. A floor assembly (1) according to any preceding claim, wherein the flanged edge (14) has a thickness identical to that of the fixing lug (131).

7. A floor assembly (1) according to any preceding claim, wherein the flanged edge (14) has a thickness greater than or equal to that of the fixing lug (131).

8. A motor vehicle comprising a floor assembly (1) according to any one of the preceding claims.

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