Underbody for motor vehicle

Abstract

The invention relates to a subframe for a motor vehicle comprising a floor (20), a longitudinally shaped side member (21) which extends along the outer edge of the floor (20), on the outer edges of said side member (21) there are at least two rebates (22). The side member (21) comprises: a side member reinforcement (24) positioned between said rebates (22); a plurality of stiffeners fixed to one of the rebates (22) and to said side member reinforcement (24); a flat area of ​​the side member (21) located on a rear part in the direction of said vehicle, said flat area being along a horizontal plane of said side member (21); one of the stiffeners of which is fixed at the level of said flat area. Figure for the abstract: Fig. 1

Description

Title of the invention: Underbody for a motor vehicle Technical field of the invention

[0001] The present invention relates to a base for a motor vehicle. It applies, in particular, to the electric motor vehicle provided with side member reinforcements on each side for the protection of the battery module. Prior art

[0002] The floor of motor vehicles is made of stamped sheet metal with grooves on the sides in which there is a reinforcement.

[0003] In order to maintain this reinforcement, it is necessary to fix stiffeners between each reinforcement and the rebates.

[0004] The size of the reinforcements varies depending on the number of battery modules and their size. There is a nominal size and a variation of this size, there is, then, a short or long pad.

[0005] The stiffeners are fixed between the rebates and the reinforcements, however when there is a long wheelbase, that is to say when the reinforcement has a dimension a little wider than the nominal dimension, the stiffeners are impossible to fix because of the shape of the spar.

[0006] The disadvantage today is that the flexibility of dimensions does not allow for great flexibility in construction. Presentation of the invention

[0007] The present invention aims to remedy these drawbacks with a completely innovative approach.

[0008] More specifically, the invention aims to provide a technique which makes it possible to solve the problem linked to flexibility.

[0009] Another objective of the invention is to provide such a technique which is inexpensive to implement while adapting to long or short pasting.

[0010] An objective of the invention is to provide such a technique, which can be easily adapted to existing systems.

[0011] These objectives, as well as others which will appear subsequently, are achieved, according to a first aspect, using a base for a motor vehicle comprising a floor, a longitudinally shaped side member which extends along the outer edge of the floor, on the outer edges of said side member there are at least two rebates, remarkable in that the side member comprises: - a spar reinforcement positioned between said grooves; - a plurality of stiffeners fixed to one of the rebates and to said spar reinforcement; - a flat area of ​​the side member located on a rear part in the direction of said vehicle, said flat area being along a horizontal plane of said side member; one of the stiffeners of which is fixed at the level of said flat area.

[0012] Thanks to these arrangements, the flat area of ​​the side member at the rear provides a stable surface for mounting stiffeners.

[0013] The flat area at the rear of the spar provides a surface to make different assemblies (more flexible depending on different lengths).

[0014] The invention is advantageously implemented according to the embodiments and variants set out below, which are to be considered individually or according to any technically effective combination.

[0015] In one embodiment, at least one battery is fixed below the floor.

[0016] In one embodiment, the floor has symmetry along a plane transverse, and another spar positioned according to said symmetry.

[0017] In one embodiment, the floor and the side member are made of stamped sheet metal.

[0018] In one embodiment, the stiffener attachments are made by arc welding.

[0019] In one embodiment, the stiffeners are fixed using electric welding.

[0020] In one embodiment, the flat area comprises a surface whose dimensions are between 2 cm2 and 20 cm2.

[0021] According to a second aspect, the present invention relates to a method of assembling a base for a motor vehicle comprising a floor, remarkable in that the method comprises the following successive steps: - install a stringer extending along the outer edge of said floor; said stringer having rebates; - fixing a plurality of stiffeners on said rebates of a spar and on a spar reinforcement; said spar reinforcement being positioned between the rebates; - fix at least one of the stiffeners to a flat area of ​​the spar.

[0022] The advantages, aims and particular characteristics of this method being similar to those of the base which is the subject of the present invention, they are not recalled here.

[0023] In one embodiment, the method further comprises a step of welding the fixings of the stiffeners to the rebates and the spar reinforcement.

[0024] In one embodiment, the method comprises a preliminary step of manufacturing the floor and the side member from stamped sheet metal. Brief description of the figures

[0025] Other advantages, aims and characteristics of the present invention emerge from the description which follows is given, for explanatory and non-limiting purposes, with reference to the attached drawings, in which:

[0026] [Fig. 1] represents a perspective view of the floor of the object of the present invention;

[0027] [Fig.2] represents a detailed and perspective view of one of the sides of the underbody of the vehicle;

[0028] [Fig.3] represents a perspective view from below of the underbody of the vehicle;

[0029] [Fig.4] represents an exploded and perspective view before the assembly of the reinforcement of the underbody of the vehicle;

[0030] [Fig.5] shows part of a perspective view of the rear side member of the vehicle underbody;

[0031] [Fig.6] shows another part of a perspective view of the rear side member of the vehicle underbody;

[0032] [Fig.7] shows part of a perspective view of the rear spar with a stiffener during a long wheelbase;

[0033] [Fig.8] shows part of a perspective view of the rear spar with a stiffener at short wheelbase. Description of the embodiments

[0034] [Fig. 1] shows a perspective view of the floor 20 of the object of the present invention.

[0035] The underbody of an electric vehicle, also called a platform, is a structure that serves as the base for the entire vehicle. It is made up of several elements.

[0036] The floor 20 or frame is the main structure of the underbody. It is generally made of steel or aluminum and is responsible for the rigidity and strength of the vehicle.

[0037] The floor 20 may comprise beams which are longitudinal elements which reinforce the frame and support the weight of the vehicle. It is also possible to have cross members which are transverse elements which connect the beams and contribute to the rigidity of the underbody.

[0038] The side members 21 are longitudinal beams that form the backbone of the underbody. They are generally made of steel or aluminum and are responsible for the rigidity and strength of the vehicle. On the edges of the side members 21 there are rebates 22.

[0039] The side member reinforcements 24 are longitudinal elements which run along the side members 21 and contribute to the rigidity of the underbody. They can be made of steel, aluminum or composite.

[0040] Naturally, the invention is described in the above by way of example. It is understood that those skilled in the art are able to carry out different variant embodiments of the invention without departing from the scope of the invention.

[0041] [Fig.2] shows a detailed and perspective view of one side of the vehicle underbody.

[0042] This figure reproduces certain elements described above.

[0043] It shows the floor 20, the side member 21, the stiffeners 23 and the side member reinforcement 24.

[0044] The stiffeners 23 are important structural elements in the underbody of an electric vehicle. They contribute to the rigidity and strength of the vehicle.

[0045] The stiffeners 23 are fixed between the grooves 22 of the spar 21 and the spar reinforcements.

[0046] The grooves 22 of the spar 21 are the folded parts of the spar 21 which create a flat surface (along the vertical) for fixing the stiffeners 23.

[0047] The spar reinforcements are located between the rebates 22. They make it possible to distribute the forces exerted on the stiffeners 23 over a larger surface area.

[0048] [Fig.3] shows a perspective and underside view of the vehicle underbody.

[0049] This figure shows the location of the batteries 26 in the underbody of the floor 20 of the vehicle and there are four batteries 26 arranged in parallel next to each other. Each battery 26 is fixed to the underbody using bolts and nuts.

[0050] [Fig.4] shows an exploded and perspective view before the vehicle underbody reinforcement is fitted.

[0051] This figure shows the reinforcement with the stiffeners 23 just before the installation of the reinforcement 24 between the grooves 22 of the side member 21 of the vehicle underbody.

[0052] The stiffeners 23 are fixed to the spar reinforcement 24 before being installed between the grooves 22 of the spar 21.

[0053] [Fig.5] shows part of a perspective view of the rear side member 21 of the vehicle underbody.

[0054] We find the rear part of the spar 21 with the grooves 22 as well as the flat zone 25.

[0055] The flat zone 25 is a flat surface located on the side member 21. It allows the stiffeners 23 to be fixed. The flat zone 25 is along a horizontal plane of said side member 21. The rear part is along the direction of the vehicle.

[0056] [Fig.6] shows another part of a perspective view of the rear side member 21 of the vehicle underbody.

[0057] This view shows the flat surface of the flat area 25. The flat area 25 has a surface whose dimensions are between 2 cm2 and 20 cm2.

[0058] [Fig.7] shows part of a perspective view of the rear spar 21 with a stiffener 23 during a long wheelbase.

[0059] This figure reproduces the elements described above.

[0060] The wheelbase is the dimension of the reinforcement relative to the dimensions of the spar 21. A long wheelbase means that the stiffener 23 is fixed a little further to the left in the figure than a short wheelbase.

[0061] The flat area 25 allows the stiffener 23 to be fixed whether it is a short or long wheelbase. The difference is a few centimeters. Without the flat area 25, fixing is impossible.

[0062] [Fig.8] shows part of a perspective view of the rear spar 21 with a stiffener 23 during a short wheelbase.

[0063] This figure reproduces the elements described above.

[0064] A short wheelbase means that the stiffener 23 is fixed a little further to the right in the figure than a long wheelbase.

[0065] It is emphasized that all features, as they emerge for a person skilled in the art from the present description, the drawings and the attached features, even if concretely they have only been described in relation to other determined features, both individually and in any combinations, can be combined with other features or groups of features disclosed herein, provided that this has not been expressly excluded or that technical circumstances make such combinations impossible or meaningless. List of reference signs

[0066] [Tables 1] References Designations 20 floor 21 side member 22 rebates 23 stiffener 24 side member reinforcement 25 flat area 26 battery

Claims

Claims

1. Underbody for a motor vehicle comprising a floor (20), a longitudinally shaped side member (21) which extends along the outer edge of the floor (20), on the outer edges of said side member (21) there are at least two rebates (22), characterized in that the side member (21) comprises: - a side member reinforcement (24) positioned between said rebates (22); - a plurality of stiffeners (23) fixed to one of the rebates (22) and to said side member reinforcement (24); - a flat area (25) of the side member (21) located on a rear part in the direction of said vehicle, said flat area (25) being along a horizontal plane of said side member (21); one of the stiffeners (23) of which is fixed at the level of said flat area (25).

2. Base according to claim 1, in which below the floor (20) is fixed at least one battery (26).

3. Base according to one of claims 1 to 2, in which the floor (20) has a symmetry along a transverse plane, and another side member (21) positioned according to said symmetry.

4. Base according to one of claims 1 to 3, in which the floor (20) and the side member (21) are made of stamped sheet metal.

5. Base according to one of claims 1 to 4, in which the fixings of the stiffeners (23) are carried out by arc welding.

6. Base according to one of claims 1 to 5, in which the fixings of the stiffeners (23) are carried out by electric welding tip.

7. Base according to one of claims 1 to 6, in which the flat zone (25) comprises a surface whose dimensions are between 2 cm2 and 20 cm2.

8. Method for assembling a base for a motor vehicle comprising a floor (20), characterized in that the method comprises the following successive steps: - installing a side member (21) extending along the outer edge of said floor (20); said side member comprising rebates (22); - fixing a plurality of stiffeners (23) on said rebates (22) of a side member and on a side member reinforcement (24); said side member reinforcement (24) being positioned between the rebates (22); - fixing at least one of the stiffeners (23) on a flat area (25) of the

9. spar (21). The method of claim 8, wherein the method further comprises a step of welding the attachments of the stiffeners (23) to the

10. rebates (22) and the side member reinforcement (24). Method according to one of claims 8 to 9, in which the method comprises a preliminary step of manufacturing the floor (20) and the side member (21) from stamped sheet metal.

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