STEERING WHEEL

Abstract

A steering wheel configured to rotate about a steering axis, comprising a rim formed of a body molded onto a frame, the body having a first mold release axis, a first groovearranged in the body in a demoldable manner relative to the first mold release axis, a sheathing reinforcement arranged to be inserted into the first groove of the body and at least partially form a second groove, wherein the second groove is arranged to receive an insert in an insertion direction separate from the first mold release axis, and in that the sheathing reinforcement comprises at least one portion which is undercut relative to the first mold release axis.

A steering wheel configured to rotate about a steering axis, comprising a rim formed of a body molded onto a frame, the body having a first mold release axis, a first groove arranged in the body in a demoldable manner relative to the first mold release axis, a sheathing reinforcement arranged to be inserted into the first groove of the body and at least partially form a second groove, wherein the second groove is arranged to receive an insert in an insertion direction separate from the first mold release axis, and in that the sheathing reinforcement comprises at least one portion which is undercut relative to the first mold release axis.

Claims

1-15. (canceled)

16. A steering wheel configured to rotate about a steering axis and comprising: a rim formed of a body molded onto the frame, the body having a first mold release axis, a first groove arranged in the body in a demoldable manner relative to the first mold release axis, a sheathing reinforcement arranged to be inserted into the first groove of the body and at least partially form a second groove, wherein the second groove is arranged to receive an insert in an insertion direction separate from the first mold release axis, and in that the sheathing reinforcement comprises at least one portion which is undercut relative to the first mold release axis.

17. The steering wheel according to claim 16, wherein the sheathing reinforcement is configured to be at least partially embedded in said first groove.

18. The steering wheel according to claim 16, wherein the first groove has a positive or zero relief angle relative to the first mold release axis.

19. The steering wheel according to claim 18, wherein said first groove comprises at least a first inner side that has a positive relief angle relative to the first mold release axis.

20. The steering wheel according to claim 16, wherein said undercut portion comprises at least a second inner side that has a negative relief angle relative to the first mold release axis.

21. The steering wheel according to claim 16, wherein the second groove is open on the exterior of the body of the rim.

22. The steering wheel according to claim 16, wherein the second groove is formed in part from said undercut portion and in part from a relief portion of the first groove.

23. The steering wheel according to claim 16, wherein the insert is a decorative part or an electrode.

24. The steering wheel according to claim 16, wherein it further comprises a trim sheath of the body of the rim, said sheath being held in contact with the undercut portion between the sheathing reinforcement and the insert.

25. The steering wheel according to claims 16, wherein the sheathing reinforcement is configured to be glued, welded and/or mechanically secured in said first groove.

26. The steering wheel according to claims 16, wherein said first groove is obtained by molding.

27. The steering wheel according to claim 16, wherein the sheathing reinforcement is arranged in a demoldable manner relative to a second mold release axis.

28. The steering wheel according to claim 27, wherein the sheathing reinforcement has a positive or zero relief angle relative to the second mold release axis.

29. The steering wheel according to claim 16, wherein the body of the rim is a urethane foam.

30. The vehicle steering wheel according to claim 16 in combination with a motor vehicle.

Description

BRIEF DESCRIPTION OF THE FIGURES

[0045] [FIG. 1] is a schematic illustration of a steering wheel in a plan view;

[0046] [FIG. 2] shows a partial cross-section of the steering wheel of FIG. 1 along the line II-II of said FIG. 1;

[0047] [FIG. 3] is a more realistic illustration of a steering wheel in a view similar to that of FIG. 1;

[0048] [FIG. 4] shows a cross-section of the steering wheel of FIG. 3 along the line IV-IV of said FIG. 3.

DETAILED DESCRIPTION

[0049] With reference to FIG. 1, it schematically shows a steering wheel 1 in a plan view that may be a view from the front or the back. The steering wheel 1 comprises a frame 10 typically produced from an alloy or a light metal, such as magnesium or aluminum. The frame 10 typically constitutes the skeleton or backbone of the steering wheel. It comprises a hub 11 from which radii or spokes 13 extend which connect the hub 11 to a core or rim 15. This rim constitutes the part that gives the circular or substantially circular shape to the steering wheel; this may be any other shape, open or closed.

[0050] The rim 15 is formed from a body 30 molded onto the frame 10. This body generally consists of a material injectable into a mold, typically a urethane foam obtained for example from a polyurethane elastomer (PU, PUR). Therefore, the body 30 has a first mold release axis 25 best visible in the cross-sections of FIGS. 2 and 4.

[0051] The steering wheel 1 is configured to turn around a steering axis 5, in particular an axis of a steering column of a vehicle equipped with such a steering wheel. This steering wheel 1 further comprises a reinforcement sheathing 20 typically circular or essentially circular in shape since it adopts the general shape of the steering wheel as seen in plan view. The reinforcement sheathing 20 may be formed in one piece or several arc of circle sections, for example. Although preferably occupying the full circumference of the steering wheel in plan view, the reinforcement sheathing may nevertheless occupy only a portion of said circumference.

[0052] As best shown in FIG. 2, illustrating a partial radial cross-section along line II-II of FIG. 1, the reinforcement sheathing 20 is configured to be inserted into a first groove 31 of the body 30 and to form at least partially a second groove 22. This groove 31 is arranged in the body 30 in a demoldable manner relative to the first mold release axis 25 and is formed to correspond with the reinforcement sheathing, over the entire circumference of the steering wheel in plan view or over a portion of said circumference. As shown in this figure, the first groove 31 is located on the outer part of the rim 15. The demoldable nature of the groove 31 means that the mold, which enables this groove 31 to be obtained, has no demolding slider device for producing the groove 31. It should be noted, however, that this groove 31 may have small undercuts that may be obtained from a mold with no slider.

[0053] As clearly shown in the schematic cross-section of FIG. 2, the second groove 22 is arranged to receive an insert 40 along an insertion direction 26 separate from the first mold release axis 25. The second groove 22, located like the first groove 31 on the exterior of the rim, could not be formed directly in body 30 with no slider in an injection mold oriented according to the first mold release axis 25. In addition, the reinforcement sheathing 20 comprises at least one undercut portion 21 relative to the first mold release axis 25. More precisely, this portion is undercut when the reinforcement sheathing 20 is positioned in the first groove 31. In the illustration of FIG. 2, this undercut portion 21 is characterized by a relief angle α.sub.2 that is negative relative to the first mold release axis 25.

[0054] The concepts of relief or positive relief angle, and undercut or negative relief angle, refer here to the field of rigid mold molding techniques. In this field, the relief represents the slope of the walls of the mold needed to enable the demolding of the parts. The concept of undercut or negative relief angle refers to when the shape of the part prevents direct demolding and therefore requires using a more complex mold comprising at least one slider to enable the release of the undercut portion. Thus, the relief angle is positive or zero if the shape of the part allows its direct demolding (with no slider), and otherwise is negative.

[0055] As a result of the object of the invention, it is possible to easily obtain a steering wheel provided with a sheathing reinforcement having at least one undercut portion, while still allowing this sheathing reinforcement to be able to be inserted into a groove that may easily be formed for example from a standard mold of two parts that are movable relative to one another. In other words, it becomes possible to position, in the first groove 31 and along the steering axis 5, a sheathing reinforcement 20 making it possible to define, by means of the undercut portion 21, at least one portion impossible to demold and which may be configured to receive an insert, for example.

[0056] Preferably, the absolute value of the relief angle α.sub.2 of the undercut portion 21 is more than 20 degrees, even greater than 30 degrees.

[0057] In a preferred embodiment, the sheathing reinforcement 20 is not only inserted into the first groove 31, but is also configured to be embedded, in other words fitted, at least in part into this first groove. This scenario is shown in particular in the schematic example provided in FIG. 2 wherein sheathing reinforcement 20 is configured to be completely embedded in the first groove 31 so that the sheathing reinforcement itself forms the second groove 22 in its entirety.

[0058] Preferably, and as shown in particular in this same FIG. 2, the first groove 31 is a groove in relief, that is, a groove that has a portion in relief relative to the first mold release axis 25. To that end, the first groove 31 may for example comprise at least a first inner side 31′ that has a zero or positive relief angle α.sub.1 relative to the first mold release axis 25.

[0059] In a first preferred embodiment, the undercut portion 21 of the sheathing reinforcement 20 comprises at least a second inner side 21″ that has a negative relief angle α.sub.2 relative to the first mold release axis 25. This embodiment is therefore distinguished from another embodiment wherein the relief angle could be zero.

[0060] Preferably, it may also be noted in FIG. 2 that the second groove 22 is open on the exterior of the body 30 of the rim 15. In other words, the second groove 22 is oriented so as to be open towards the exterior of the steering wheel 1.

[0061] FIGS. 3 and 4 are illustrations of a steering wheel model 1 viewed respectively from the top and in radial cross-section along line IV-IV of FIG. 3. In the cross-section of FIG. 4, it can be seen that the sheathing reinforcement 20 itself alone does not define a second groove 22 in its entirety, but it only defines a portion of said second groove. Indeed, in this figure the second groove 22 is formed at least in part from the undercut portion 21 of the sheathing reinforcement 20 and in part from a portion of the first groove 31.

[0062] Preferably, this portion of first groove is also a relief portion 33. In this FIG. 4, this first groove 31 is shown by a broken line and has a shape that may be demolded relative to the first mold release axis 25, which preferably is parallel to the steering axis 5.

[0063] In a preferred embodiment, the second groove 22 formed at least partially from the undercut portion 21, is configured to receive the insert 40.

[0064] This insert 40 could be a decorative part, particularly a trim part of the steering wheel 1 having the shape of all or part of a ring or crown produced from wood or any other material. Alternatively or in addition, the insert could consist of an electrode, for example an electrode to measure the driver's heart rate.

[0065] In one embodiment, the steering wheel 1 further comprises a trim sheath 60 of the body 30 of the rim. This sheath 60 may typically be a leather sheath or one made of another preferably supple material. As shown in FIG. 4, the sheath 60 could be held in contact with the undercut portion 21, between the sheathing reinforcement 20 and the insert 40, in particular by means of at least one of the ends 61 of this sheath.

[0066] The sheathing reinforcement 20 could be configured to be glued, welded and/or mechanically secured in the first groove 31. In a case where this sheathing reinforcement is welded, ultrasound or laser welding could be preferred.

[0067] Preferably, the first groove 31 is obtained by molding, in particular during the overmolding of the body 30 and even more specifically by a molding that allows a direct demolding of this first groove 31. Thus, the mold used to obtain the first groove 31 may advantageously be a mold with no slider, which simplifies the molding/demolding operations and contributes to reducing production costs of the steering wheel.

[0068] In one embodiment, the sheathing reinforcement 20 could be arranged in a demoldable manner relative to a second mold release axis, i.e., relative to a mold release axis independent of the first mold release axis 25 of the body 30. Furthermore, such a sheathing reinforcement could also have a positive or zero relief angle relative to this second mold release axis. Advantageously, it is therefore possible to obtain, on the steering wheel, a groove with undercut areas obtained from parts that were injected in a simple way or at less cost.

[0069] Also preferably, the body 30 of the rim 15 is a urethane foam (for example PU, PUR) or an injectable material produced from such a foam.

[0070] In a second aspect, the invention relates to a vehicle, in particular an automobile, comprising a steering wheel 1 according to any one of the embodiments described hitherto or according to any one of the possible combinations of these embodiments.