Vehicle steering wheel with an electrical device

Abstract

The invention relates to a vehicle steering wheel comprising: - a hub (30) arranged to be connected to a steering member of the vehicle, - at least one spoke (20) attached to the hub (30); - a rim (10) attached to said at least one spoke (20), comprising: • at least one electrical device (14) covering at least a portion of a core of the rim (10) and comprising a substrate (141) supporting at least one electrical conductor (142); • at least one covering part, such as an outer sheath (15), defining an outer surface of the rim (10); and • at least one layer of aqueous adhesive arranged to attach the covering part to the rim (10), characterised in that the rim (10) comprises at least one film (13) comprising a polymer, arranged between the electrical device (14) and the layer of aqueous adhesive.

Description

DESCRIPTION TITLE: Vehicle steering wheel with an electrical device Technical field of the invention

[0001] The present invention relates generally to vehicle steering wheels, and in particular to vehicle steering wheels equipped with an electrical device (such as a heating device or a device for detecting contact or proximity with the user), particularly at the rim level. State of the art

[0002] In the prior art of steering wheels for vehicles equipped with an electrical device (such as a heating element or a contact / proximity sensor), particularly at the rim, it is known to position the electrical device on a core within the rim. The core typically consists of a frame overmolded with an overmolding material. The electrical device itself includes, among other things, an electrical conductor carried on a flexible substrate. A trim piece (typically an outer sheath) and / or the electrical device may be attached to each other or each may be attached to the rim with an adhesive, particularly a water-based or aqueous adhesive.It can happen that the glue diffuses into the flexible substrate and / or onto the electrical conductor, which can lead to bonding defects and / or electrical faults (short-circuiting a heating circuit, changing the capacitive characteristics of a contact or proximity sensor, etc.). Description of the invention

[0003] One aim of the present invention is to overcome the drawbacks of the prior art mentioned above and, in particular, firstly, to provide a vehicle steering wheel equipped with an electrical device whose operation is not disrupted even if the armature is close to the electrical device and / or even if the fixing of the electrical device on the steering wheel involves steering wheel assembly processes with, for example, drying or crosslinking reactions which still occur during control phases.

[0004] To this end, a first aspect of the invention concerns a vehicle steering wheel, comprising: - a hub designed to be connected to a steering component of the vehicle, - at least one branch attached to the hub, - a rim attached to said at least one branch, comprising: • at least one electrical device covering at least part of a rim core and comprising a substrate supporting at least one electrical conductor, • at least one trim piece, such as an external sheath, defining an external surface of the rim, • at least one layer of adhesive, preferably aqueous, arranged to attach the trim piece to the rim, characterized in that the rim comprises at least one film comprising a polymer, arranged between the electrical device and the layer of adhesive, preferably aqueous.

[0005] According to the implementation described above, the steering wheel includes a layer of adhesive, which can be any type of adhesive, but is preferably water-based, and a polymer film is placed between the (water-based) adhesive layer and the electrical device. This prevents any migration of liquid or water from the adhesive to the electrical device, particularly immediately after application, i.e., during the manufacturing of the steering wheel. Indeed, it has been observed that without the film, electrical defects can occur during or immediately after manufacturing, and may or may not disappear after a few hours or even tens of hours (for example, 72 hours) after manufacturing. The film eliminates these defects. Furthermore, the film prevents any migration of aqueous glue into porous or absorbent substrates, thus reducing peeling or bonding defects.

[0006] Specifically, the adhesive layer can be a layer of glue applied (spread, sprayed, coated, etc.) in paste or liquid form to the steering wheel to attach the trim piece. In other words, the aqueous adhesive layer is not the same as the adhesive layer applied to a flexible substrate to form an adhesive tape, for example, supplied on a reel or roll and then unwound. The aqueous adhesive layer is not part of a double-sided adhesive tape. In particular, the adhesive layer can be a layer of glue that must dry or cure after the trim piece is attached. The film containing a polymer thus forms a barrier between the electrical device and the aqueous adhesive (and its water content), which allows for insulation tests to be performed on the steering wheel before the adhesive layer has completely dried (or fully cured). An aqueous adhesive is simply a water-based adhesive that is spread onto the polymer film and / or the trim piece.This is an independent component, and in particular is not intended to be attached to any substrate on the rim, as would be the case with adhesive tape.

[0007] In other words, the film forms a barrier to the moisture contained in the aqueous glue and reduces defects that could appear in steering wheels without a protective film attached to or adjacent to the electrical device.

[0008] Generally speaking, an adhesive is a liquid or paste-like adhesive, and / or an adhesive with at least a liquid component that evaporates during a drying step. In one embodiment, the adhesive is a water-based adhesive. In another, the adhesive is a solvent-based adhesive, or an adhesive with a solvent or organic solvent. In other words, during the application of the adhesive, a liquid component (water or organic solvent) can migrate into porous materials and / or disrupt the operation of the electrical device. The film containing a polymer acts as an impermeable barrier to the liquid component, preventing it from migrating into porous materials. porous materials, and / or disrupt the operation of the electrical device.

[0009] According to one embodiment, the aqueous glue (liquid or paste) is applied directly to the film comprising a polymer (itself applied to the electrical device), and / or to parts of the steering wheel (typically the trim piece) attached to the electrical device (protected by the polymer film).

[0010] According to one embodiment, the electrical device may comprise a single substrate supporting said at least one electrical conductor.

[0011] In one embodiment, the electrical insulating film can form an independent component. In other words, the electrical insulating film can be a sheath, a barrier, or a film separating the electrical conductor from the core, formed by a separate sheet (before assembly onto the core). In particular, the electrical insulating film can form a component free of an adhesive layer. Specifically, the insulating film is not a layer of glue spread on the core and / or on the electrical device (or inside the electrical device). An electrical insulating film is naturally thin (with a thickness of less than 0.2 mm, between 0.01 mm and 0.05 mm) and allows for two distinct layers of overmolding material without requiring a large rim diameter.

[0012] In one embodiment, the substrate is not a film. In another embodiment, the substrate is a porous support and / or one with through-holes (such as openings between the threads of a woven or nonwoven fabric, or openings in an open-cell foam). Such openings cannot prevent contact between the electrical conductor and the core, so the electrically insulating film ensures good electrical insulation.

[0013] In one embodiment, the substrate may be a woven material, a non-woven fabric (entangled fibers), an open-cell foam, or a perforated or porous sheet. In another embodiment, the substrate may be made of plastic (polyvinyl chloride (PVC), polyamide, polyurethane, polyether, polyester, polyethylene, thermoplastic polyurethane (TPU), elastomer such as ethylene propylene diene monomer (EPDM), polypropylene, etc.), inorganic material (glass fibers, etc.), or a mixture of these materials.

[0014] In one embodiment, the electrical conductor (e.g., a heating element) can be sewn onto the substrate. In particular, the electrical conductor can be attached to the substrate by a wire passing through it. Such an attachment can at least partially perforate the substrate, potentially creating areas without electrical insulation. The insulating film, applied after sewing (or after attaching the electrical conductor to the substrate), is free of perforations and / or through holes.

[0015] In one embodiment, the film comprising a polymer may be a continuous, pore-free film. In another embodiment, the film comprising a polymer may be a waterproof film, and / or a plastic film, and / or a composite film comprising a plastic layer, and / or a composite film comprising a waterproof layer.

[0016] In one embodiment, the film comprising a polymer can exhibit resistance to hydrostatic pressure of at least 5000 mm of water, preferably at least 10000 mm of water, preferably at least 15000 mm of water, and most preferably at least 20000 mm of water. A test based on ISO 811 can be implemented, which consists of applying a column of water of increasing height to the film. The test stops when water passes through the film.

[0017] In one embodiment, the cover piece can be a flexible part, for example, a cover sleeve. In particular, the cover piece The cover piece can be a flexible component, such as a piece made of synthetic or natural leather. The cover piece can be made of fabric, non-woven or non-woven material, carbon fiber, Kevlar, or wood, with or without resin.

[0018] In one embodiment, the polymer film may have a thickness of less than 200 µm, preferably between 10 µm and 100 µm, ideally between 10 µm and 50 µm. The polymer film may be sufficiently supple and / or flexible to conform to the complex shapes of the rim, so that it can be applied or wrapped onto the rim without forming creases visible to the driver of the vehicle.

[0019] In one embodiment, the film comprising a polymer can be made of polyethylene (PE), polyurethane (PU), ethylene propylene diene monomer (EPDM), polyvinyl chloride (PVC), or thermoplastic polyurethane (TPU). The film comprising a polymer can be sufficiently supple and / or flexible to conform to the complex shapes of the rim, so that it can be applied or wrapped onto the rim without forming creases visible to the driver of the vehicle.

[0020] In one embodiment, the film comprising a polymer may include polyethylene (PE), and / or polyurethane (PU), and / or ethylene propylene diene monomer (EPDM), and / or polyvinyl chloride (PVC), and / or thermoplastic polyurethane (TPU). The film comprising a polymer may be sufficiently supple and / or flexible to conform to the complex shapes of the rim, so that it can be applied or wrapped onto the rim without forming creases visible to the driver of the vehicle.

[0021] According to one embodiment, the film comprising a polymer may have a density within a range of values ​​from 1.10 g / cm³ 3 at 1.30 g / cm² 3 The film, comprising a polymer, can be designed to be sufficiently supple and / or flexible to adapt to complex shapes of the rim, so that it can be placed or sheathed on the rim without forming creases visible to the user of the vehicle's steering wheel.

[0022] In one embodiment, the film comprising a polymer and the electrical device can form a layered structure, preferably before the electrical device is assembled onto the steering wheel. In other words, the insulating film and the electrical device can form a single component to be deposited on the rim.

[0023] In one embodiment, the film comprising a polymer and the electrical device can form a layered structure, preferably before the electrical device is assembled onto the steering wheel. In particular, the insulating film and the electrical device can form a single component to be deposited onto an external sheath, such as leather, to provide a single component to be fitted to the rim in a single operation.

[0024] According to one embodiment, the electrical device is a layered structure in which the film comprising a polymer and / or the electrical conductor is attached by an adhesive, such as a double-sided adhesive film, in particular water-based.

[0025] In one embodiment, the film comprising a polymer or the electrical conductor can be fixed to the electrical device by means of an adhesive, such as a double-sided adhesive film, particularly a water-based one. The assembly can be robust.

[0026] In one embodiment, the film comprising a polymer can be arranged between the core and the electrical device. The structure can remain simple and does not require any other intermediate component to prevent malfunctions (short circuits or measurement disturbances).

[0027] In one embodiment, the film comprising a polymer can be arranged between the electrical device and the housing. The structure can remain simple and does not require any other intermediate component to prevent malfunctions (short circuits or measurement disturbances).

[0028] According to one embodiment, the rim may include a second film comprising a polymer, and in which the electrical device may be arranged between the two insulating films.

[0029] According to one embodiment, the electrical device can form a heating device and / or a device for detecting contact or proximity of a user with the steering wheel.

[0030] According to one embodiment, the substrate of the electrical device can be a foam, with a density in a range of values ​​from 0.10 g / cm³ 3 at 0.80 g / cm² 3. Such a substrate can be designed to be sufficiently flexible and / or pliable to adapt to the complex shapes of the rim, so that it can be laid or sheathed onto the rim without forming folds visible to the user.

[0031] In one embodiment, the substrate of the electrical device can be made of polyethylene (PE), polyurethane (PU), ethylene propylene diene monomer (EPDM), or polyvinyl chloride (PVC). Such a substrate can be sufficiently flexible to conform to the complex shapes of the rim, allowing it to be applied or sheathed onto the rim without forming creases visible to the user.

[0032] In one embodiment, the substrate of the electrical device may comprise polyethylene (PE), and / or polyurethane (PU), and / or ethylene propylene diene monomer (EPDM), and / or polyvinyl chloride (PVC). Such a substrate may be sufficiently soft and / or flexible to conform to the complex shapes of the rim, so that it can be applied or sheathed onto the rim without forming creases visible to the user.

[0033] According to one embodiment, the substrate of the electrical device may have a thickness greater than 500 µm. Such a substrate may be sufficiently flexible to adapt to the complex shapes of the rim, so that it can be deposited or sheathed onto the rim without forming folds visible to the user.

[0034] In one embodiment, the substrate of the electrical device can be formed by an open-cell foam, or by a woven or non-woven material. Such a substrate can be made sufficiently supple and / or flexible to adapt to the complex shapes of the rim, so that it can be deposited or sheathed onto the rim without forming creases visible to the user. In this case, the invention is particularly useful because without the polymer film, the substrate can absorb a significant amount of liquid.

[0035] A second aspect of the invention relates to a vehicle comprising a vehicle steering wheel according to the first aspect.

[0036] According to one embodiment, the flywheel may include a second overmolding material at least partially overmolded onto the electrical device.

[0037] According to one embodiment, the film comprising a polymer can be a barrier film, in particular a moisture barrier film

[0038] According to one embodiment, the film comprising a polymer can be a flexible film so that it can be deposited or sheathed onto the rim without forming folds visible to the user of the vehicle's steering wheel.

[0039] In one embodiment, the film comprising a polymer may be a continuous, pore-free film. In another embodiment, the film comprising a polymer may be a waterproof film, and / or a plastic film, and / or a composite film comprising a plastic layer, and / or a composite film comprising a waterproof layer.

[0040] According to one embodiment, the film comprising a polymer can cover between 75 and 100% of the surface of the substrate that supports the electrical conductor.

[0041] According to one embodiment, the film comprising a polymer can be arranged opposite the entire part of the substrate that supports the electrical conductor.

[0042] According to one embodiment, the film comprising a polymer can be arranged entirely between the aqueous glue layer and the electrical device.

[0043] According to one embodiment, the film comprising a polymer can completely cover the aqueous adhesive layer.

[0044] According to one embodiment, the electrical device can be a sheath covering at least part of the core.

[0045] According to one embodiment, the electrical conductor may be without an insulating sheath.

[0046] According to one embodiment, the core may include a portion of reinforcement and an overmolding material overmolded at least on a part of the portion of reinforcement.

[0047] Another aspect of the invention relates to a method for manufacturing a steering wheel, comprising the steps of: - to provide a steering wheel frame comprising a hub, a rim and at least one spoke connecting the hub to the rim, - attach to the steering wheel at least one electrical device covering at least part of a rim core and comprising a substrate supporting at least one electrical conductor, the electrical device being provided with a film comprising a polymer on at least part of the electrical device, - cover or coat at least part of the film with a water-based adhesive, - Attach at least one trim piece to the steering wheel using water-based adhesive. Water-based adhesive can be applied to the trim piece instead of, or in addition to, the film. The film can only be applied to the electrical component once it is attached to the steering wheel.

[0048] According to the implementation described above, the aqueous adhesive cannot migrate towards the electrical device thanks to the polymer film. Consequently, the water contained in the aqueous adhesive cannot interfere with the The electrical device can be powered on even if the aqueous adhesive has not yet finished drying or curing. The electrical device can be switched on immediately after the above procedure is completed, and even while the liquid or paste-like aqueous adhesive is being applied.

[0049] The aqueous glue can be applied with a brush, roller, spatula, or by spraying: the polymer film acts as an electrical insulating barrier.

[0050] In any case, the polymer film is intended to cover the entire surface of the electrical device that will receive the water-based adhesive. In other words, the polymer film is intended to cover the entire area of ​​the housing to be bonded; no part of the electrical device (substrate or electrical conductor) receives water-based adhesive. Description of the figures

[0051] Other features and advantages of the present invention will become more apparent upon reading the following detailed description of an embodiment of the invention given by way of non-limiting example and illustrated by the accompanying drawings, in which:

[0052] [fig. 1] represents a front view of a vehicle's steering wheel;

[0053] [fig. 2] represents a cross-sectional view of a wheel rim from the vehicle in figure 1;

[0054] [fig. 3] represents another cross-sectional view of the vehicle steering wheel rim in figure 1;

[0055] [fig. 4] represents a schematic view of an electrical device of the steering wheel rim of the vehicle in figure 1. Detailed description of implementation method(s)

[0056] Figure 1 represents a vehicle steering wheel with a rim 10, a hub 30, and spokes 20 connecting the rim 10 to the hub 30. The rim 10 It provides a user interface that can be grasped with their hands to drive the vehicle. To improve comfort and / or offer driver assistance options, the 10-inch rim can be equipped with one or more electrical devices (heating and / or contact or proximity detection devices).

[0057] To perform these functions, the electrical device can be positioned under the outer surface of the rim 10. As shown in the schematic cross-section in Figure 2, along the line ll-ll of Figure 1, the rim 10 includes, in particular: - a frame 11, - an overmolding material 12, - an electrical device 14, - a covering piece or an external sheath 15.

[0058] The frame 11 is typically a metal part forming the skeleton of the vehicle's steering wheel. It can be an injection-molded metal part, made of magnesium for example. The overmolding material 12 is used to fill the frame 11 and can be a plastic, a polymer, a foam, or polyurethane foam, for example. The frame 11 and the overmolding material 12 thus form a core N of the rim 10.

[0059] The electrical device 14 is schematically represented in Figure 4 and may comprise a substrate 141 (a flexible sheet, such as a plastic, a polymer, a foam, an open-cell foam, a fabric, or a nonwoven material, etc.) on which an electrical conductor 142, or a plurality of electrical conductors (one or more metal wires, a deposit of a conductive material, a conductive fabric or nonwoven material, etc.), can be provided. Figure 4 represents a film 13 comprising a polymer, the function of which will be explained below.

[0060] Finally, the outer sheath 15 forms a finishing piece and covers everything for a polished look. A sheath in natural leather or synthetic or any other covering material. The outer sheath 15 can be sewn with a seam 16.

[0061] The outer sheath 15 can be attached to the rim 10 with adhesive, specifically water-based adhesive. For example, a water-based polyurethane adhesive could be used. Initially, the adhesive could contain, for example, at least 40% water by mass, or at least 50% water by mass.

[0062] Figure 2 shows a cross-section of the rim 10 along the line ll-ll of Figure 1, and Figure 3 shows another cross-section of the rim 10 along the line lll-lll of Figure 1. Figure 3 shows the same elements as Figure 2, but as Figure 3 shows, the reinforcement 11 may have a different shape and may be located closer to the surface of the overmolding material 12.

[0063] With regard to the electrical device 14, it can be foreseen that the electrical conductor 142 of the electrical device 14 may be at least partly on the surface of the substrate 141 and opposite the core N of the rim 10 or opposite the outer sheath 15. In the context of figure 3 the proximity of the armature 11 may cause a problem and cause a short circuit or a disruption of operation in the context of, for example, a contact or proximity sensor (typically capacitive).

[0064] Furthermore, the adhesive used to attach the outer sheath 15 (or any other trim piece) to the rim contains water. The adhesive is applied in a layer to the surfaces of the parts to be joined. Typically, one or both surfaces can be coated with adhesive and then brought into contact to bond the part in question (the outer sheath 15, the electrical device 14, etc.) to the rim 10. The adhesive may migrate or disperse into the adjacent materials, and / or water may come into contact with the electrical conductor 142 and / or the substrate 141 of the electrical device 14. Consequently, the bonding capacity may be reduced if adhesive migrates or is absorbed by the materials of the parts to be glued together, and on the other hand water can cause electrical faults in the electrical device 14.

[0065] To prevent any risk, a polymer film 13 is provided between the electrical device 14 and the aqueous adhesive layer applied to the rim 10 and / or the part to be attached (the outer sheath 15, the electrical device 14, etc.). This means that the polymer film 13 is provided between the electrical device 14 and the overmolding material 12, and / or the outer sheath 15, depending on the location of the aqueous adhesive layer. Thus, a waterproof barrier is provided by the polymer film 13, and / or a minimum distance (the thickness of the polymer film 13) is maintained between the electrical device 14 and the overmolding material 12 and / or the reinforcement 11.

[0066] In detail, the polymer film 13 can be designed to be flexible and deformable to conform well to the complex shapes of the steering wheel. For this purpose, the polymer film 13 can be made of polyethylene (PE), polyurethane (PU), ethylene propylene diene monomer (EPDM), polyvinyl chloride (PVC), or thermoplastic polyurethane (TPU). Thermoplastic polyurethane (TPU) is preferred. The polymer film 13 can have a thickness of less than 200 µm, preferably between 10 µm and 100 µm, ideally between 10 µm and 50 µm. The polymer film can have a density within a range of values ​​from 1.10 g / cm³ 3 at 1.30 g / cm² 3

[0067] To assemble the steering wheel, two methods can be used for covering the rim 10. In a single-cover method, the electrical device 14 and the outer sheath 15 are pre-assembled and then placed on the rim 10 in a single step. In a double-cover method, the electrical device 14 and the outer sheath 15 are assembled successively in two steps on the rim 10.

[0068] In the context of simple sheathing, the electrical device 14 is to be fixed to the outer sheath 15 using double-sided adhesive film (double-sided tape), particularly water-based, to obtain a single-piece subassembly. The film 13, comprising a polymer, is then or previously attached to the electrical device 14 by an adhesive element of any kind (a thin layer of adhesive material used on adhesive strips and previously applied to one of the components concerned, or a double-sided adhesive strip (double-sided tape)), particularly water-based, which can be applied manually or by an automated process, or an adhesive spread on one of the film 13 comprising a polymer and the electrical device 14...) to obtain a laminate to be deposited directly onto the core N of the rim 10. It should be noted that the film 13 comprising a polymer forms the lower or inner surface of this laminate.

[0069] Next, aqueous adhesive can be spread on the core N and / or on the polymer film 13 to bond the laminate (polymer film 13 - electrical device 14 - outer sheath 15) to the rim 10, and the optional stitching 16 can be performed. According to this configuration, the polymer film 13 and the electrical device 14 are deposited in a single operation, along with the outer sheath 15, onto the rim core N, with the polymer film 13 always sandwiched between the aqueous adhesive layer and the electrical device 14.

[0070] In the context of the double sheathing method, the film 13 comprising a polymer can be previously attached to the electrical device 14 by an adhesive element of any kind (a thin layer of adhesive material used on adhesive strips and previously deposited on one of the components concerned, or a double-sided adhesive strip (double-sided tape), in particular water-based, which can be deposited manually or according to an automated process, or an adhesive spread on one of the film 13 comprising a polymer and the electrical device 14...) to obtain a laminate to be deposited directly on the core N of the rim 10.

[0071] The electrical device 14 can be fixed to the rim core N with an adhesive element of any kind (a thin layer of adhesive material used on adhesive strips and previously deposited on one of the components concerned, or a double-sided adhesive strip (double-sided tape)), in particular water-based, which can be deposited manually or by an automated process.

[0072] Next, aqueous adhesive can be spread on the film 13 comprising a polymer and / or the outer sheath 15 in order to bond the outer sheath 15 to the rim 10, and the optional stitching 16 can be performed. Industrial application

[0073] A vehicle steering wheel according to the present invention, and its manufacture, are capable of industrial application.

[0074] It will be understood that various modifications and / or improvements obvious to a person skilled in the art can be made to the different embodiments of the invention described in this description without departing from the scope of the invention.

Claims

DEMANDS

1. Vehicle steering wheel, including: - a hub (30) arranged to be connected to a steering element of the vehicle, - at least one arm (20) attached to the hub (30), - a rim (10) attached to said rim by at least one spoke (20), comprising: • at least one electrical device (14) covering at least part of a rim core (10) and comprising a substrate (141) supporting at least one electrical conductor (142), • at least one trim piece, such as an external sheath (15), defining an external surface of the rim (10), • at least one layer of aqueous adhesive arranged to attach the trim piece to the rim (10), characterized in that the rim (10) comprises at least one film (13) comprising a polymer, arranged between the electrical device (14) and the layer of aqueous adhesive.

2. Vehicle steering wheel according to claim 1, wherein the film (13) comprising a polymer has a thickness of less than 200 pm, preferably between 10 pm and 100 pm, ideally between 10 pm and 50 pm.

3. Vehicle steering wheel according to any one of claims 1 to 2, wherein the film (13) comprising a polymer comprises polyethylene (PE), and / or polyurethane (PU), and / or ethylene-propylene-diene monomer polymer (EPDM), and / or poly(vinyl chloride) (PVC), and / or thermoplastic polyurethane (TPU).

4. A vehicle steering wheel according to any one of claims 1 to 3, wherein the film (13) comprising a polymer has a density in the range of 1.10 g / cm³ 3 at 1.30 g / cm² 3 .

5. Vehicle steering wheel according to any one of claims 1 to 4, wherein the film (13) comprising a polymer and the electrical device (14) form a layered structure, preferably before the electrical device (14) is assembled onto the steering wheel.

6. A vehicle steering wheel according to any one of claims 1 to 5, wherein the electrical device (14) is a layered structure in which the film (13) comprising a polymer and / or the electrical conductor is attached by an adhesive, such as a double-sided adhesive film, in particular a water-based one.

7. Vehicle steering wheel according to any one of claims 1 to 6, wherein the film (13) comprising a polymer is arranged between the core and the electrical device.

8. Vehicle steering wheel according to any one of claims 1 to 6, wherein the film (13) comprising a polymer is arranged between the electrical device and the trim piece.

9. Vehicle steering wheel according to any one of claims 1 to 8, wherein the rim comprises a second film (13) comprising a polymer, and wherein the electrical device (14) is arranged between the two insulating films.

10. Vehicle steering wheel according to any one of claims 1 to 9, wherein the electrical device (14) forms a heating device and / or a device for detecting contact or proximity of a user with the steering wheel.

11. A vehicle steering wheel according to any one of claims 1 to 10, wherein the substrate (141) of the electrical device (14) is a foam, with a density in the range of 0.10 g / cm³ 3 at 0.80 g / cm² 3 .

12. A vehicle steering wheel according to any one of claims 1 to 11, wherein the substrate (141) of the electrical device (14) is made of polyethylene (PE), and / or polyurethane (PU), and / or ethylene propylene diene monomer (EPDM), and / or polyvinyl chloride (PVC).

13. A vehicle steering wheel according to any one of claims 1 to 12, wherein the substrate (141) of the electrical device (14) has a thickness greater than 500 µm.

14. Vehicle steering wheel according to any one of claims 1 to 12, wherein the substrate (141) of the electrical device (14) is formed by an open-cell foam, or by a woven or non-woven piece.

15. Vehicle comprising a vehicle steering wheel according to any one of claims 1 to 14.

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