Vehicle steering wheel having an electrical device

Abstract

The present invention relates to a hub (30) arranged to be connected to a steering element of a vehicle; at least one branch (20) attached to a hub (30); a rim (10) attached to said at least one branch (20), said rim (10) comprising: at least one electrical device (14) comprising a substrate (141) covering at least a portion of the core of the rim (10) and supporting at least one electrical conductor (142); At least one trim piece, such as an outer sheath (15), defining an outer surface of the rim (10); at least one layer of a water-based adhesive arranged to attach the trim piece to the rim (10); The present invention relates to a vehicle steering wheel, characterized in that the rim (10) comprises at least one film (13) comprising a polymer, disposed between an electric device (14) and a layer of a water-based adhesive.

Description

[Technical field]

[0001] The present invention relates generally to vehicle steering wheels, and in particular to vehicle steering wheels equipped with electrical devices, such as devices for heating or for detecting contact or proximity with a user, especially in the rim. [Background technology]

[0002] In prior art vehicle steering wheels equipped with electrical devices (such as devices for heating or for detecting contact or proximity with a user), in particular on the rim, it is known to position the electrical devices on the core of the rim. The core typically consists of a frame overmolded with an overmolding material. The electrical devices then comprise electrical conductors carried by a flexible substrate. The trim pieces (typically outer sheaths) and / or the electrical devices can be attached to each other or to the rim, respectively, by means of an adhesive, in particular a water-soluble or water-based adhesive. The adhesive can diffuse into the flexible substrate and / or onto the electrical conductors, which can result in joint and / or electrical failure (such as a short circuit in the heating circuit or a change in the capacitive characteristics of the contact or proximity sensor). Summary of the Invention [Problem to be solved by the invention]

[0003] One object of the present invention is to overcome the above-mentioned drawbacks of the prior art and in particular to firstly propose a vehicle steering wheel equipped with an electric device, the operation of which is not hindered even if the frame is close to the electric device and / or the attachment of the electric device to the vehicle steering wheel involves a steering wheel assembly method involving drying or crosslinking reactions that still occur, for example during the testing phase.

[0004] Therefore, a first aspect of the present invention comprises: a hub arranged to be connected to a steering element of a vehicle; at least one branch attached to a hub; a rim attached to said at least one branch, said rim comprising: at least one electrical device comprising a substrate covering at least a portion of the core of the rim and supporting at least one electrical conductor; at least one trim piece, such as an outer sheath, defining an outer surface of the rim; at least one layer of adhesive, preferably water-based, arranged to attach the trim piece to the rim; The present invention relates to a vehicle steering wheel, characterized in that the rim comprises at least one film comprising a polymer, disposed between an electric device and a layer of preferably water-based adhesive.

[0005] According to the above embodiment, the steering wheel comprises an adhesive layer, which can be any type of adhesive, but preferably a water-based adhesive, and a film comprising a polymer is provided between the (water-based) adhesive layer and the electric device. This prevents any liquid or water migration from the adhesive to the electric device, especially immediately after gluing, i.e. during the manufacturing of the steering wheel. Indeed, it has been found that without the film, electrical failures may occur during or immediately after manufacturing, which may or may not disappear within a few hours or tens of hours (for example 72 hours) after manufacturing. By injecting the film, these defects are eliminated. Moreover, the film prevents any migration of the water-based adhesive to the porous or absorbent substrate, reducing the risk of delamination or bonding defects.

[0006] In particular, the layer of adhesive may be a layer of adhesive that is applied (sprayed, sprayed, coated, etc.) in the form of a paste or liquid to the steering wheel to attach the trim piece. In other words, the layer of water-based adhesive is not an adhesive layer that is applied to a flexible substrate to form an adhesive tape that is, for example, supplied on a reel or roll and then unwound. The layer of water-based adhesive is not part of a double-sided adhesive tape. In particular, the layer of adhesive may be a layer of adhesive that needs to be dried or crosslinked after the trim piece is attached. Thus, the film containing the polymer forms a barrier between the electrical device and the water-based adhesive (and the water), allowing the steering wheel to undergo an insulation test before the layer of adhesive is completely dried (or cured). The water-based adhesive is simply a water-containing adhesive that is applied to the polymer film and / or the trim piece. It is a standalone component and is not provided on any substrate that is fixed to the rim, as is the case with adhesive tapes.

[0007] In other words, the film forms a barrier to the moisture contained in the water-based adhesive, reducing defects that can occur in steering wheels that do not have a protective film next to or adjacent to electrical devices.

[0008] Generally, the adhesive is a liquid or pasty adhesive and / or an adhesive with at least one liquid part that evaporates during a drying step. According to one embodiment, the adhesive is a water-soluble adhesive. According to an alternative, the adhesive is a solvent-based adhesive or a pressure sensitive adhesive with a solvent or organic solvent. In other words, during application of the adhesive, the liquid part of the adhesive (water or organic solvent) may migrate into the porous material and / or interfere with the operation of the electrical device. The film comprising the polymer acts as an impermeable barrier to the liquid part, preventing it from migrating into the porous material and / or from interfering with the operation of the electrical device.

[0009] According to one embodiment, the water-based adhesive (liquid or paste) is applied directly to a polymer-containing film (which itself is applied to the electrical device) and / or to a part of the steering wheel (typically a trim piece) attached to the electrical device (which is protected by a polymer film).

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

[0011] According to one embodiment, the electrical insulating film may form an independent component in itself. In other words, the electrical insulating film may be an envelope or barrier formed by an independent sheet (before assembly on the core), or a film separating the conductor from the core. In particular, the electrical insulating film may form a component without an adhesive layer. In particular, the insulating film is not a layer of adhesive applied on the core and / or on the electrical device (or inside the electrical device). The electrical insulating film is naturally thin (having a thickness of less than 0.2 mm, 0.01 mm to 0.05 mm), making it possible to propose two separate layers of overmolding material without increasing the diameter of the rim.

[0012] According to one embodiment, the substrate is not a film. According to one embodiment, the substrate is a porous support and / or has through openings (openings between threads of woven or nonwoven fabrics, openings of open-cell foam, etc.). Such openings cannot prevent contact between the conductor and the core, so that the electrically insulating film ensures good electrical insulation.

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

[0014] According to one embodiment, the electrical conductors (e.g., heating elements) can be sewn onto the substrate. In particular, the electrical conductors can be attached onto the substrate by wires that penetrate the substrate. Such attachment can at least partially perforate the substrate, potentially creating areas without electrical insulation, and an insulating film applied after the seam (or after attachment of the electrical conductors onto the substrate) is free of perforations and / or through holes.

[0015] According to one embodiment, the film comprising the polymer may be a continuous film without holes. According to one embodiment, the film comprising the polymer may be a film impermeable to water and / or a film of a plastic material and / or a composite film comprising a layer of a plastic material and / or a composite film comprising a layer made of a material impermeable to water.

[0016] According to one embodiment, the film comprising the polymer can have a resistance to a hydrostatic pressure of at least 5,000 mm of water, preferably at least 10,000 mm of water, preferably at least 15,000 mm of water, very preferentially at least 20,000 mm of water. It is possible to start a test according to the ISO 811 standard, which consists in applying to the film a water column of increasing height. When the water passes through the film, the test is stopped.

[0017] According to one embodiment, the trim piece may be a flexible piece such as a trim sheath. In particular, the trim piece may be a flexible piece such as synthetic or natural leather. The trim piece may be made of fiber, non-woven, carbon, Kevlar, wood, with or without resin.

[0018] According to one embodiment, the film comprising the polymer may have a thickness of less than 200 μm, preferentially between 10 μm and 100 μm, ideally between 10 μm and 50 μm. The film comprising the polymer may be provided sufficiently soft and / or flexible to conform to the complex shape of the rim so that it can be placed or covered on the rim without forming creases visible to a user of the vehicle steering wheel.

[0019] According to one embodiment, the polymer-containing film may be formed from polyethylene (PE), or polyurethane (PU), or ethylene-propylene-diene monomer (EPDM), or poly(vinyl chloride) (PVC), or thermoplastic polyurethane (TPU). The polymer-containing film may be provided sufficiently soft and / or flexible to conform to the complex shape of the rim so that it can be placed or covered over the rim without forming creases visible to a user of the vehicle steering wheel.

[0020] According to one embodiment, the film comprising a polymer may comprise polyethylene PE, and / or polyurethane PU, and / or ethylene-propylene-diene monomer EPDM monomer, and / or polyvinyl chloride PVC, and / or thermoplastic polyurethane TPU. The film comprising a polymer may be provided sufficiently soft and / or flexible to conform to the complex shape of the rim so that it can be placed or covered on the rim without forming creases visible to a user of the vehicle steering wheel.

[0021] According to one embodiment, the film comprising the polymer has a viscosity of 1.10 g / cm 3 ~1.30g / cm 3 A film including the polymer may be provided that is sufficiently soft and / or flexible to conform to the complex shape of a rim such that it can be placed or covered over the rim without forming creases that are visible to a user of the vehicle steering wheel.

[0022] According to one embodiment, the polymer-containing film and the electrical device may 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 may form a single component and be placed onto the rim.

[0023] According to one embodiment, the film including the polymer and the electrical device may form a layered structure, preferably before the electrical device is assembled onto the steering wheel. In particular, the insulating film and the electrical device may form a single component that is applied to an outer sheath made of, for example, leather, to provide a single component that is applied to the rim in a single operation.

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

[0025] According to one embodiment, the polymer-containing film or conductor may be attached to the electrical device by an adhesive, such as a double-sided adhesive film, especially a water-based adhesive film. The assembly may be robust.

[0026] According to one embodiment, a film including a polymer can be placed between the core and the electrical device, and the structure can remain simple and does not require other intermediate components to avoid malfunctions (short circuits or measurement disturbances).

[0027] According to one embodiment, the film including the polymer can be placed between the electrical device and the trim piece, and the structure can remain simple and does not require other intermediate components to avoid malfunctions (short circuits or measurement disturbances).

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

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

[0030] According to one embodiment, the substrate of the electrical device has a surface roughness of 0.10 g / cm 3 ~0.80g / cm 3 Such a substrate may be provided to be sufficiently soft and / or flexible to conform to the complex shape of the rim such that it can be placed or covered over the rim without forming creases visible to the user.

[0031] According to one embodiment, the substrate of the electrical device may be formed from polyethylene (PE), or polyurethane (PU), or ethylene-propylene-diene monomer (EPDM), or poly(vinyl chloride) (PVC). Such a substrate may be provided to be sufficiently soft and / or flexible to conform to the complex shape of the rim so that it can be placed or covered on the rim without forming creases visible to the user.

[0032] According to one embodiment, the substrate of the electrical device may comprise polyethylene PE, and / or polyurethane PU, and / or ethylene-propylene-diene monomer EPDM monomer, and / or polyvinyl chloride PVC. Such a substrate may be provided to be sufficiently soft and / or flexible to conform to the complex shape of the rim so that it can be placed or covered on the rim without forming creases visible to the user.

[0033] According to one embodiment, the substrate of the electrical device may have a thickness of greater than 500 μm. Such a substrate may be provided to be sufficiently soft and / or flexible to conform to the complex shape of the rim such that it can be placed or coated on the rim without forming creases visible to the user.

[0034] According to one embodiment, the substrate of the electrical device may be formed by open-cell foam or by woven or non-woven pieces. Such a substrate may be provided to be sufficiently soft and / or flexible to conform to the complex shape of the rim so that it can be placed or covered on the rim without forming creases visible to the user. In this case, the invention is particularly useful since, without the polymer-containing 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 steering wheel may include a second overmolded material at least partially overmolded onto the electrical device.

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

[0038] According to one embodiment, the film including the polymer may be a flexible film so that it may be deposited or coated onto the rim without creating creases that are visible to a user of the vehicle steering wheel.

[0039] According to one embodiment, the film comprising the polymer may be a continuous film without holes. According to one embodiment, the film comprising the polymer may be a film impermeable to water and / or a film of a plastic material and / or a composite film comprising a layer of a plastic material and / or a composite film comprising a layer made of a material impermeable to water.

[0040] According to one embodiment, the film comprising the polymer may cover 75-100% of the surface of the substrate supporting the conductors.

[0041] According to one embodiment, a film including a polymer may be disposed opposite the entire portion of the substrate that carries the conductors.

[0042] According to one embodiment, a film including a polymer may be disposed entirely between the layer of water-based adhesive and the electrical device.

[0043] According to one embodiment, the film comprising the polymer may completely cover the layer of water-based adhesive.

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

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

[0046] According to one embodiment, the core may include a frame portion and an overmolded material overmolded onto at least a portion of the frame portion.

[0047] Another aspect of the invention is a method of manufacturing a steering wheel, comprising the steps of: - providing a steering wheel frame comprising a hub, a rim and at least one branch connecting the hub to the rim; - mounting on the steering wheel at least one electric device comprising a substrate covering at least a part of the core of the rim and supporting at least one electrical conductor, the electric device being provided on at least a part of the electric device with a film comprising a polymer; - covering or coating at least a portion of the film with a water-based adhesive; - adhering at least one trim piece to the steering wheel using a water-based adhesive. The water-based adhesive can be applied to be coated on the trim piece instead of or in addition to the film. The film can be applied to the electrical device only after the electrical device is attached to the steering wheel.

[0048] According to the above embodiment, the polymer film prevents the water-based adhesive from migrating to the electrical device. As a result, the water contained in the water-based adhesive will not interfere with the operation of the electrical device even if the water-based adhesive has not finished drying or curing. The electrical device can be switched on immediately after the above procedure is completed and even during the application of the liquid or paste-like water-based adhesive.

[0049] The water-based adhesive can be applied by brush, roller, spatula or spray, and the polymer film acts as an electrically insulating barrier.

[0050] In either case, the polymer film is provided over the entire surface of the electrical device that will receive the water-based adhesive, in other words, the polymer film is provided opposite the entire portion of the trim pieces that will be joined, and no portion of the electrical device (substrate or conductors) will receive the water-based adhesive. [Brief description of the drawings]

[0051] Other characteristics and advantages of the present invention will become more apparent on reading the following detailed description of embodiments of the invention, given by way of example, but in no way limiting, illustrated by the accompanying drawings in which: [Figure 1] FIG. 1 is a front view of a vehicle steering wheel. [Diagram 2] FIG. 2 shows a cross-sectional view of the rim of the vehicle steering wheel of FIG. [Diagram 3] FIG. 3 shows another cross-sectional view of the steering wheel rim of FIG. [Figure 4] FIG. 4 shows a schematic diagram of the electrical device of the vehicle steering wheel rim of FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0052] 1 shows a vehicle steering wheel having a rim 10, a hub 30, and a branch 20 connecting the rim 10 to the hub 30. The rim 10 provides an operating interface for a user who can hold the rim 10 in his / her hands to drive the vehicle. To improve comfort and / or suggest driving assistance options, the rim 10 may be equipped with one or more electric devices (heating and / or devices for detecting contact or proximity with the user).

[0053] To perform these functions, electrical devices can be installed under the outer surface of the rim 10. As shown in the schematic cross-sectional view of Figure 2 along the line II-II of Figure 1, the rim 10 is provided with, among other things: -Frame 11 and an overmold material 12; an electrical device 14; a trim piece or outer sheath 15.

[0054] The frame 11 is typically a metal part that forms the framework of the vehicle steering wheel. It is possible to provide an injected metal part, for example magnesium. The overmold material 12 allows backing to the framework 11 and may be, for example, a plastic, a polymer, a foam, a polyurethane foam. The frame 11 and the overmold material 12 thus form the core N of the rim 10.

[0055] The electrical device 14 is shown diagrammatically in Figure 4 and may comprise a substrate 141 (e.g. a flexible sheet of a plastic material, a polymer, a foam, an open-cell foam, e.g. a woven or non-woven material, etc.) on which a conductor 142, or a number of conductors (one or more metal wires sewn together, a deposit of a conductive material, a cloth or a conductive non-woven, etc.) may be provided. Figure 4 shows a film 13 comprising a polymer, the function of which will be explained below.

[0056] Finally, the outer sheath 15 forms the trim piece and provides an overall covering and attractive appearance. It is possible to provide the sheath made of natural or synthetic leather, or any other covering material. The outer sheath 15 can be sewn with a seam 16.

[0057] The outer sheath 15 can be attached to the rim 10 using an adhesive, in particular a water-based adhesive. For example, a water-based polyurethane adhesive can be used. Firstly, the adhesive can contain, for example, at least 40% water by weight, or at least 50% water by weight.

[0058] Figure 2 shows a cross section of the rim 10 along line II-II in Figure 1, and Figure 3 shows another cross section of the rim 10 along line III-III in Figure 1. Figure 3 shows the same elements as Figure 2, but as shown in Figure 3, the frame 11 may have a different shape and may be located closer to the surface of the overmolded material 12.

[0059] With regard to the electrical device 14, it may be provided that the electrical conductors 142 of the electrical device 14 are at least partially on the surface of the substrate 141 and can face either the core N of the rim 10 or the outer sheath 15. In the situation of Figure 3, the proximity of the frame 11 may cause problems, for example causing shorting of contact or proximity sensors (typically capacitive) or disrupting operation within the frame.

[0060] Moreover, the adhesive used to attach the outer sheath 15 (or any other trim piece) to the rim contains water. The adhesive is applied in layers to the surfaces of the parts to be fastened together. Typically, one or both surfaces are glued together and then brought into contact to bond the part in question (outer sheath 15, electrical device 14, etc.) to the rim 10. The adhesive may migrate or disperse into the adjacent materials and / or the water may come into contact with the conductors 142 and / or the substrate 141 of the electrical device 14. As a result, on the one hand, the bonding capacity may be reduced if the adhesive migrates or is absorbed by the materials of the parts to be joined together, and on the other hand, the water may cause an electrical failure in the electrical device 14.

[0061] To prevent any risk, a film 13 comprising a polymer is provided between the electric device 14 and a layer of water-based adhesive applied to the rim 10 and / or to the parts to be attached (outer sheath 15, electric device 14, etc.), i.e. between the electric device 14 and the overmolding material 12 on the one hand and the outer sheath 15 on the other hand, depending on the location of the layer of water-based adhesive. Thus, a water-impermeable barrier is provided by the film 13 comprising a polymer and / or a minimum distance (thickness of the film 13 comprising a polymer) is maintained between the electric device 14 and the overmolding material 12 and / or the frame 11.

[0062] In particular, the film 13 comprising a polymer may be provided so as to be flexible and deformable in order to adapt to the complex shape of the steering wheel. For this purpose, it may be provided that the film 13 comprising a polymer is made from polyethylene (PE), or from polyurethane (PU), or from ethylene-propylene-diene monomer (EPDM), or from poly(vinyl chloride) (PVC), or from thermoplastic polyurethane (TPU). Thermoplastic polyurethane (TPU) may be preferred. The film 13 comprising a polymer may have a thickness of less than 200 μm, preferentially between 10 μm and 100 μm, ideally between 10 μm and 50 μm. The film comprising a polymer may have a thickness of less than 1.10 g / cm 3 ~1.30g / cm 3 The density may be within the range of values.

[0063] To assemble the steering wheel, two methods can be provided for coating the rim 10. In the one-time coating method, the electric device 14 and the outer sheath 15 are pre-assembled together and then placed in one operation on the rim 10. In the two-time coating method, the electric device 14 and the outer sheath 15 are successively assembled on the rim 10 in two operations.

[0064] For easy covering, the electric device 14 is attached to the outer sheath 15 using, in particular, a water-based double-sided adhesive film (double-sided Scotch tape) to form an integral subassembly. The film 13 containing polymer is attached on the electric device 14 by means of an adhesive element of any nature, in particular water-based (a thin layer of adhesive material used on an adhesive tape and previously placed on one of the components in question, or a double-sided adhesive tape (double-sided Scotch tape)), or an adhesive applied either on the film containing polymer 13 or on the electric device 14, etc.), which can then or beforehand be placed manually or in an automated manner to obtain a laminate that is placed directly on the core N of the rim 10. It is noted that the film 13 containing polymer forms the lower or inner surface of this laminate.

[0065] A water-based adhesive can then be applied onto the core N and / or the polymer-containing film 13 to bond the laminate (polymer-containing film 13-electrical device 14-outer sheath 15) to the rim 10, and an optional seam 16 can be sewn. According to this configuration, the polymer-containing film 13 and the electrical device 14 are laminated together with the outer sheath 15 on the core N of the rim 10 in a single operation, with the polymer-containing film 13 being inserted in each case between the layer of water-based adhesive and the electrical device 14.

[0066] In the two-coating method, the polymer-containing film 13 may be attached to the electrical device 14 by means of an adhesive element of any nature, in particular water-based (a thin layer of adhesive material used on an adhesive tape and pre-placed on one of the components in question, or a double-sided adhesive tape (double-sided Scotch tape), or an adhesive applied either on the polymer-containing film 13 or on the electrical device 14, etc.), which may be placed manually or in an automated manner to obtain a laminate that is placed directly on the core N of the rim 10.

[0067] The electrical device 14 may be attached to the core N of the rim using any kind of adhesive element, in particular water-based (a thin layer of adhesive material used on adhesive tape and previously applied to one of the components in question, or double-sided adhesive tape (double-sided Scotch tape)), which may be applied manually or using an automated method.

[0068] A water-based adhesive may then be applied onto the polymer-containing film 13 and / or the outer sheath 15 to bond the outer sheath 15 to the rim 10, and an optional seam 16 may be sewn. [Industrial Applicability]

[0069] The vehicle steering wheel and the manufacturing method thereof according to the present invention are industrially applicable.

[0070] It will be understood that various modifications and / or improvements, apparent to those skilled in the art, can be made to the various embodiments of the invention described herein without departing from the scope of the invention.

Claims

1. a hub (30) arranged to be connected to a steering element of a vehicle; at least one branch (20) attached to said hub (30); a rim (10) attached to said at least one branch (20), said rim (10) comprising: at least one electrical device (14) comprising a substrate (141) covering at least a portion of the core of said rim (10) and supporting at least one electrical conductor (142); at least one trim piece, such as an outer sheath (15), defining the outer surface of said rim (10); at least one layer of water-based adhesive arranged to attach said trim piece to said rim (10); A vehicle steering wheel, characterized in that the rim (10) comprises at least one film (13) comprising a polymer, disposed between the electrical device (14) and a layer of water-based adhesive.

2. Vehicle steering wheel according to claim 1, wherein said film (13) comprises a polymer having a thickness of less than 200 μm, preferentially between 10 μm and 100 μm, ideally between 10 μm and 50 μm.

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

4. The film (13) has a thickness of 1.10 g / cm ３ ~1.30g / cm ３ 4. A vehicle steering wheel according to claim 1, comprising a polymer having a density falling within the range of values:

5. 5. The vehicle steering wheel according to any one of claims 1 to 4, wherein the film (13) comprising a polymer and the electric device (14) form a laminate structure, preferably before the electric device (14) is assembled on the steering wheel.

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

7. Vehicle steering wheel according to any one of the preceding claims, wherein the film (13) comprising a polymer is disposed between the core and the electric device.

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

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

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

11. The substrate (141) of the electrical device (14) has a viscosity of 0.10 g / cm ３ ~0.80g / cm ３ 11. A vehicle steering wheel according to claim 1, which is a foam having a density comprised within the range of values:

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

13. Vehicle steering wheel according to any one of the preceding claims, wherein the substrate (141) of the electric 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 electric device (14) is made of open-cell foam or a woven or non-woven piece of fabric.

15. A vehicle comprising a vehicle steering wheel according to any one of the preceding claims.

Images