Vehicle steering wheel with electrical devices

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 generally relates to vehicle steering wheels, and more particularly to vehicle steering wheels equipped with electrical devices (such as devices for heating or detecting contact or proximity with a user), especially on the rim.

Background Art

[0002] In prior art vehicle steering wheels equipped with electrical devices (such as devices for heating or detecting contact or proximity with a user), especially on the rim, it is known to position the electrical device on the core of the rim. The core typically consists of a frame overmolded with an overmolding material. The electrical device then comprises a conductor carried by a flexible substrate. The trim piece (typically an outer sheath) and / or the electrical device can be attached to each other or each attached to the rim using an adhesive, especially a water-soluble or aqueous adhesive. The adhesive can diffuse into the flexible substrate and / or onto the conductor, resulting in possible joint and / or electrical failures (such as short circuits in the heating circuit, changes in the capacitance characteristics of the contact or proximity sensor, etc.).

Summary of the Invention

Problems 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, firstly, to provide a vehicle steering wheel equipped with an electrical device whose operation is not impaired even when the frame is close to the electrical device and / or when the attachment of the electrical device to the vehicle steering wheel involves a steering wheel assembly method with a drying or cross-linking reaction that still occurs, for example, during the testing stage.

[0004] Therefore, a first aspect of the present invention is - A hub positioned to connect to the vehicle's steering element, - At least one branch attached to the hub, - comprising a rim attached to at least one branch, the rim being, • At least one electrical device comprising a substrate that covers at least a portion of the core of the rim and supports at least one conductor, • At least one trim piece, such as an outer sheath, that defines the outer surface of the rim, The trim piece comprises at least one layer of preferably water-based adhesive, which is 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 containing a polymer, which is disposed between an electrical device and, preferably, a layer of aqueous adhesive.

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

[0006] In particular, the adhesive layer may be an adhesive layer applied to the steering wheel in the form of a paste or liquid (applied, sprayed, coated, etc.) for attaching the trim piece. In other words, the aqueous adhesive layer is not an adhesive layer applied to a flexible substrate to form an adhesive tape that is supplied on a reel or roll and then unwound, for example. The aqueous adhesive layer is not part of a double-sided adhesive tape. In particular, the adhesive layer may be an adhesive layer that needs to dry or crosslink after the trim piece has been attached. Thus, the polymer-containing film forms a barrier between the electrical device and the aqueous adhesive (and its water), allowing the steering wheel to undergo insulation testing before the adhesive layer is completely dry (or cured). The aqueous adhesive is simply an adhesive containing water that is applied to a polymer film and / or 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 tape.

[0007] In other words, the film forms a barrier against the moisture contained in the water-based adhesive, reducing defects that may occur in a steering wheel without a protective film next to or adjacent to an electrical device.

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

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

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

[0011] According to one embodiment, the electrical insulating film can form an independent component itself. In other words, the electrical insulating film may be an envelope or barrier, or a film that separates a conductor from the core, formed by an independent sheet (before assembly onto the core). In particular, the electrical insulating film may form a component without an adhesive layer. Specifically, the insulating film is not a layer of adhesive applied on the core and / or on (or inside) the electrical device. The electrical insulating film is naturally thin (less than 0.2 mm, having a thickness of 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 fabric, openings in open-cell foam, etc.). Such openings cannot prevent contact between the conductor and the core, and as a result, the electrical insulating film ensures good electrical insulation.

[0013] According to one embodiment, the substrate may be a woven fabric, a nonwoven fabric (of intertwined fibers), a foam having open cells, or a perforated sheet or a porous sheet. According to one embodiment, the substrate can be made from plastics (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 glass fibers), or mixtures of these materials.

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

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

[0016] According to one embodiment, a polymer-containing film can have resistance to the 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, and very preferably at least 20,000 mm of water. A test can be initiated according to the ISO 811 standard, which consists of applying a water column of increasing height to the film. The test is stopped when the water passes through the film.

[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 fibers, nonwoven fabrics, carbon, Kevlar, or wood, with or without resin.

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

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

[0020] According to one embodiment, the polymer-containing film may include 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 polymer-containing film may be provided to be sufficiently flexible and / or pliable to conform to the complex shape of the rim so that it can be placed on or covered on the rim without forming creases visible to the user of the vehicle steering wheel.

[0021] According to one embodiment, a film containing a polymer may have a density within the range of 1.10 g / cm 3 ~1.30 g / cm 3 . The film containing the polymer may be provided to be sufficiently flexible and / or flexible enough to conform to the complex shape of the rim so that it can be placed or coated on the rim without forming creases visible to the user of the vehicle steering wheel.

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

[0023] According to one embodiment, the film containing the polymer and the electrical device may preferably form a layered structure before the electrical device is assembled on the steering wheel. In particular, the insulating film and the electrical device can form a single component applied to an outer sheath made of leather, for example, 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, and the film containing the polymer and / or the conductor is attached by an adhesive, particularly an aqueous double-sided adhesive film.

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

[0026] According to one embodiment, the film containing the polymer can be disposed between the core and the electrical device. The structure can remain simple and does not require other intermediate components to avoid malfunction (short circuit or measurement interference).

[0027] According to one embodiment, a polymer-containing film may be placed between an electrical device and a trim piece. The structure can remain simple and does not require other intermediate components to avoid malfunctions (short circuits or measurement interference).

[0028] According to one embodiment, the rim may comprise a second film containing a polymer, and the electrical device may be placed 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 with or proximity to the user's steering wheel.

[0030] According to one embodiment, the substrate of the electrical device is 0.10 g / cm³ 3 ~0.80g / cm 3 The foam may have a density that falls within a range of values. Such a substrate may be provided to be sufficiently flexible and / or pliable to conform to the complex shape of the rim so that it can be placed on or covered on the rim without forming creases visible to the user.

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

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

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

[0034] According to one embodiment, the substrate of an electrical device may be formed from an open-cell foam or from a woven or nonwoven fabric strip. Such a substrate may be provided to be sufficiently flexible and / or pliable to conform to the complex shape of the rim so that it can be placed on or covered on the rim without forming creases visible to the user. In this case, the present invention is particularly useful because, without a polymer-containing film, the substrate can absorb a considerable amount of liquid.

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

[0036] According to one embodiment, the steering wheel may include a second overmolded material that is at least partially overmolded onto an electrical device.

[0037] According to one embodiment, the polymer-containing film may be a barrier film, particularly a moisture barrier film.

[0038] According to one embodiment, the polymer-containing film can be a flexible film so that it can be deposited or coated onto the rim of the vehicle steering wheel without forming creases visible to the user.

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

[0040] According to one embodiment, a polymer-containing film can cover 75-100% of the surface of a substrate supporting a conductor.

[0041] According to one embodiment, a polymer-containing film may be positioned opposite the entire portion of the substrate supporting the conductor.

[0042] According to one embodiment, a polymer-containing film can be completely positioned between a layer of aqueous adhesive and an electrical device.

[0043] According to one embodiment, a polymer-containing film can completely cover a layer of aqueous adhesive.

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

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

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

[0047] Another aspect of the present invention is a method for manufacturing a steering wheel, - A step of providing a steering wheel frame comprising a hub, a rim, and at least one branch connecting the hub to the rim, - A step of mounting at least one electrical device to a steering wheel, the at least one electrical device comprising a substrate covering at least a portion of the core of the rim and supporting at least one conductor, wherein the electrical device is provided with a film containing a polymer in at least a portion of the electrical device, - A step of covering or coating at least a portion of the film with a water-based adhesive, The present invention relates to a method comprising the steps of: - attaching at least one trim piece to the steering wheel using a water-based adhesive. The water-based adhesive can be applied to the trim piece in place of or in addition to the film. The film can only be applied to the electrical device after the electrical device has been mounted to the steering wheel.

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

[0049] Water-based adhesives can be applied by brush, roller, spatula, or spray, and the polymer film acts as an electrical insulating barrier.

[0050] In either case, the polymer film is provided across the entire surface of the electrical device that will receive the aqueous adhesive. In other words, the polymer film is provided opposite the entire portion of the trim piece to be bonded, and no portion of the electrical device (substrate or conductor) will receive the aqueous adhesive. [Brief explanation of the drawing]

[0051] Other features and advantages of the present invention will become more apparent by reading the following detailed description of embodiments of the present invention, which are provided as examples but are not limited thereto and are illustrated by the following accompanying drawings. [Figure 1] Figure 1 is a front view of the vehicle's steering wheel. [Figure 2] Figure 2 shows a cross-sectional view of the rim of the vehicle steering wheel shown in Figure 1. [Figure 3] Figure 3 shows another cross-sectional view of the steering wheel rim shown in Figure 1. [Figure 4] Figure 4 shows a schematic diagram of the electrical devices on the rim of the vehicle steering wheel shown in Figure 1. [Modes for carrying out the invention]

[0052] Figure 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 to a user who can grip the rim 10 with their hands to drive the vehicle. To improve comfort and / or offer driving assistance options, the rim 10 may be equipped with one or more electrical devices (heating and / or devices for detecting contact or proximity to the user).

[0053] To perform these functions, electrical devices can be mounted beneath the outer surface of the rim 10. As shown in the schematic cross-sectional view of Figure 2 along the line II-II in Figure 1, the rim 10 is, in particular, the following: -Frame 11 and, - Overmolding material 12, - Electrical device 14 and, -Equipped with a trim piece or outer sheath 15.

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

[0055] The electrical device 14 is schematically shown in Figure 4 and may comprise a substrate 141 (e.g., a flexible sheet such as a plastic material, polymer, foam, open-cell foam, or, for example, a woven or nonwoven fabric) on which a conductor 142, or a plurality of conductors (such as one or more stitched metal wires, a deposit of conductive material, a cloth, or a conductive nonwoven fabric) may be provided. Figure 4 shows a polymer-containing film 13 whose function will be described below.

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

[0057] The outer sheath 15 can be attached to the rim 10 using an adhesive, particularly an aqueous adhesive. For example, an aqueous polyurethane adhesive can be used. Initially, the adhesive may contain, for example, at least 40% by mass of water, or at least 50% by mass of water.

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

[0059] With respect to the electrical device 14, the conductor 142 of the electrical device 14 may be provided such that it is at least partially on the surface of the substrate 141 and can face the core N of the rim 10 or face the outer sheath 15. In the situation shown in Figure 3, proximity to the frame 11 can cause problems, such as short circuits of contact or proximity sensors (typically capacitive) or interference with operation within the frame.

[0060] 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 layers to the surfaces of the parts to be fastened together. Typically, one or both surfaces can be bonded together and then brought into contact to join the parts in question (outer sheath 15, electrical device 14, etc.) to the rim 10. The adhesive may migrate or disperse into the adjacent material, and / or the water may come into contact with the conductors 142 and / or substrate 141 of the electrical device 14. As a result, on the one hand, the bonding ability may be reduced if the adhesive migrates or is absorbed by the materials of the parts being joined together, and on the other hand, the water may cause an electrical failure in the electrical device 14.

[0061] To prevent any risks, a polymer-containing film 13 is provided between the electrical device 14 and the layer of aqueous adhesive applied to the rim 10 and / or the parts to be attached (outer sheath 15, electrical device 14, etc.). That is, the polymer-containing film 13 is provided between the electrical device 14 and the overmolding material 12 on the one hand, and between the outer sheath 15 on the other, depending on the location of the layer of aqueous adhesive. Thus, the polymer-containing film 13 provides a water-impermeable barrier and / or maintains a minimum distance (thickness of the polymer-containing film 13) between the electrical device 14 and the overmolding material 12 and / or the frame 11.

[0062] In detail, the polymer-containing film 13 may be provided to be flexible and deformable in order to conform to the complex shape of the steering wheel. For this purpose, the polymer-containing film 13 may be made from polyethylene (PE), polyurethane (PU), ethylene-propylene-diene monomer (EPDM), poly(vinyl chloride) (PVC), or thermoplastic polyurethane (TPU). Thermoplastic polyurethane (TPU) may be preferred. The polymer-containing film 13 may have a thickness of less than 200 μm, preferably 10 μm to 100 μm, and ideally 10 μm to 50 μm. The polymer-containing film has a density of 1.10 g / cm³. 3 ~1.30g / cm 3 It may have a density that falls within the range of values.

[0063] Two methods can be provided for covering the rim 10 for assembling the steering wheel. In the one-step covering method, the electrical device 14 and the outer sheath 15 are pre-assembled together and then installed on the rim 10 in a single operation. In the two-step covering method, the electrical device 14 and the outer sheath 15 are assembled sequentially on the rim 10 in two operations.

[0064] For simple covering, the electrical device 14 is attached to the outer sheath 15 using a water-based double-sided adhesive film (double-sided Scotch tape) to form an integrated subassembly. The polymer-containing film 13 is then attached to the electrical device 14 by a water-based adhesive element of any nature (a thin layer of adhesive material used on adhesive tape and pre-placed on one of the components in question, or double-sided adhesive tape (double-sided Scotch tape)), or an adhesive applied on either the polymer-containing film 13 or the electrical device 14, in order to obtain a laminate that is then or pre-placed directly on the core N of the rim 10. Note that the polymer-containing film 13 forms the bottom or inner surface of this laminate.

[0065] Next, to bond the laminate (polymer-containing film 13 - electrical device 14 - outer sheath 15) to the rim 10, an aqueous adhesive can be applied to the core N and / or the polymer-containing film 13, and an optional seam 16 can be sewn in place. 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, and in either case, the polymer-containing film 13 is inserted between the layer of aqueous adhesive and the electrical device 14.

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

[0067] The electrical device 14 may be attached to the core N of the rim using any type of adhesive element, particularly an aqueous one (a thin layer of adhesive material used on adhesive tape and pre-applied to one of the components in question, or double-sided adhesive tape (double-sided Scotch tape)), which can be applied manually or using automated methods.

[0068] Next, a water-based adhesive can be applied to the polymer-containing film 13 and / or the outer sheath 15 to join the outer sheath 15) to the rim 10, and an optional seam 16 can be sewn on. [Industrial applicability]

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

[0070] It will be understood that various modifications and / or improvements obvious 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 present invention.

Claims

1. A hub (30) positioned to be connected to the steering element of the vehicle, At least one branch (20) attached to the hub (30), The system comprises a rim (10) attached to at least one branch (20), wherein the rim (10) An electrical device (14) comprising a substrate (141) that covers at least a portion of the core of the rim (10) and supports at least one conductor (142), At least one trim piece, such as an outer sheath (15), which shows the outer surface of the rim (10), The trim piece comprises at least one layer of aqueous adhesive arranged to attach the trim piece to the rim (10), The rim (10) comprises at least one film (13) containing a polymer, which is disposed between the electrical device (14) and the aqueous adhesive layer. A vehicle steering wheel characterized in that the film (13) contains a polymer having a thickness of less than 200 μm.

2. The vehicle steering wheel according to claim 1, wherein the film (13) containing the polymer and the electrical device (14) form a laminated structure before the electrical device (14) is assembled onto the steering wheel.

3. A hub (30) positioned to be connected to the steering element of the vehicle, At least one branch (20) attached to the hub (30), The system comprises a rim (10) attached to at least one branch (20), wherein the rim (10) An electrical device (14) comprising a substrate (141) that covers at least a portion of the core of the rim (10) and supports at least one conductor (142), At least one trim piece, such as an outer sheath (15), which shows the outer surface of the rim (10), The trim piece comprises at least one layer of aqueous adhesive arranged to attach the trim piece to the rim (10), The rim (10) comprises at least one film (13) containing a polymer, which is disposed between the electrical device (14) and the aqueous adhesive layer. A vehicle steering wheel characterized in that the film (13) containing a polymer and the electrical device (14) form a laminated structure before the electrical device (14) is assembled on the steering wheel.

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

5. The film (13) has a density of 1.10 g / cm². ３ ~1.30 g / cm ３ A vehicle steering wheel according to any one of claims 1 to 3, comprising a polymer having a density within the range of values.

6. The vehicle steering wheel according to any one of claims 1 to 3, wherein the electrical device (14) is a laminated structure in which the film (13) and / or the conductor containing a polymer are attached by an adhesive, particularly an aqueous double-sided adhesive film.

7. The vehicle steering wheel according to any one of claims 1 to 3, wherein the film (13) containing the polymer is disposed between the core and the electrical device.

8. The vehicle steering wheel according to any one of claims 1 to 3, wherein the film (13) containing the polymer is disposed between the electrical device and the trim piece.

9. The vehicle steering wheel according to any one of claims 1 to 3, wherein the rim comprises a second film (13) containing a polymer, and the electrical device (14) is disposed between the two insulating films.

10. The vehicle steering wheel according to any one of claims 1 to 3, wherein the electrical device (14) forms a heating device and / or a device for detecting contact or proximity of the user to the vehicle steering wheel.

11. The substrate (141) of the electrical device (14) has a density of 0.10 g / cm³. ３ ~0.80 g / cm ３ A vehicle steering wheel according to any one of claims 1 to 3, wherein the foam has a density that falls within the range of the specified value.

12. The vehicle steering wheel according to any one of claims 1 to 3, 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) polymer and / or poly(vinyl chloride) (PVC).

13. The vehicle steering wheel according to any one of claims 1 to 3, wherein the substrate (141) of the electrical device (14) has a thickness greater than 500 μm.

14. The vehicle steering wheel according to any one of claims 1 to 3, wherein the substrate (141) of the electrical device (14) is made of an open-cell foam, or a woven or non-woven fabric piece.

15. A vehicle equipped with a vehicle steering wheel according to any one of claims 1 to 3.

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