DEVICE FOR REMOVABLY MOUNTING AN AIRBAG MODULE

Abstract

The invention relates to a motor vehicle steering wheel comprising a device for removably mounting an airbag module on the steering wheel, the mounting device comprising at least two hooks linked to either the airbag module or the steering wheel, first portions extending into the interaction zones to form the means for holding the hooks guiding elements forming two distinct removal paths for guiding a removal tool, the steering wheel comprising a single removal opening for insertion of the removal tool along the two removal paths.

Claims

1. (canceled)

2. (canceled)

3. (canceled)

4. (canceled)

5. (canceled)

6. (canceled)

7. (canceled)

8. (canceled)

9. (canceled)

10. (canceled)

11. (canceled)

12. (canceled)

13. (canceled)

14. (canceled)

15. (canceled)

16. A pushing member for a motor vehicle pedestrian protection device, comprising: a fixed body, arranged to be attached to the vehicle, a piston, mobile relative to the fixed body between a rest position and a deployed position, a pyrotechnic actuator, arranged to cause the piston to move from the rest position to the deployed position, characterized in that the piston is crimped on the fixed body to be held in the rest position.

17. The pushing member according to claim 16, wherein the piston crimped in the rest position comprises at least one crimped wall portion, bearing against a bearing portion of the fixed body and inclined relative to a direction of displacement of the piston.

18. The pushing member according to claim 16, wherein the piston has a circumference, and wherein the piston is crimped over the whole of its circumference or only over segments.

19. The pushing member according to claim 16, wherein the fixed body comprises at least one groove, and wherein the piston, crimped in its rest position, comprises a wall portion arranged in the groove, following a plastic deformation.

20. The pushing member according to claim 16, wherein the fixed body comprises at least one protrusion, and wherein the piston, crimped in its rest position, comprises a wall portion arranged bearing against the protrusion, following a plastic deformation.

21. The pushing member according to claim 16, wherein the fixed body comprises: a crimping interface, arranged to enable crimping for holding the piston in its rest position, a stop interface, arranged to form an end-of-travel stop for the piston to define the deployed position, and wherein the end-of-travel stop has a passage dimension for the piston which is greater than a passage dimension of the crimping interface.

22. The pushing member according to claim 16, wherein the fixed body comprises: a crimping interface, arranged to enable crimping for holding the piston in its rest position, a stop interface, arranged to form an end-of-travel stop for the piston to define the deployed position, and wherein the end-of-travel stop has a passage dimension for the piston which is less than or equal to a passage dimension of the crimping interface.

23. The pushing member according to claim 20, wherein the fixed body comprises a thinned portion between the crimping interface and the stop interface, the thinned portion having a passage dimension which is less than the passage dimension of the crimping interface.

24. The pushing member according to claim 20, wherein the fixed body comprises a thinned portion between the crimping interface and the stop interface, the thinned portion having a passage dimension which is greater than the passage dimension of the crimping interface.

25. The pushing member according to claim 16, wherein the fixed body comprises resilient retaining means arranged to engage with the piston and to hold it in the deployed position.

26. The pushing member according to claim 16, wherein the pyrotechnic actuator comprises a pyrotechnic igniter crimped, overmolded or clipped onto the fixed body.

27. The pushing member according to claim 16, wherein the fixed body comprises a base and a slot arranged in the base to form a passage for an element for connecting the pyrotechnic actuator.

28. The pushing member according to claim 16, wherein the piston is formed by a sheath.

29. The pushing member according to claim 16, in combination with a vehicle pedestrian protection device for forming a hood-raising member.

30. The pushing member according to claim 16, in combination with a motor vehicle.

Description

[0034] Other features and advantages of the present invention will be more clearly apparent on reading the following detailed description of an embodiment of the invention, given by way of non-limiting example and illustrated by the appended drawings, which show:

[0035] FIG. 1, a first exploded view of a steering wheel fitted with the device for removably mounting an airbag module;

[0036] FIG. 2, a view from below a part of the device for removably mounting an airbag module, in the locking position;

[0037] FIG. 3, a view from below a part of the device for removably mounting an airbag module, in the unlocking position;

[0038] The motor vehicle steering wheel and the removable mounting device according to the invention will now be described with reference to FIGS. 1 to 3.

[0039] Hereinafter, axis of rotation A of the steering wheel 2 will be used to denote the axis about which the rotation of the steering wheel causes the wheels of the vehicle to be steered using a mechanical, electrical and/or hydraulic transmission mechanism (not shown).

[0040] As is known per se, an airbag 1 module 1 is mounted on the steering wheel 2 via a mounting plate 3. The mounting plate 3 is fastened to the steering wheel 2 via screws 21. The airbag module 1 is mounted on the mounted plate 3 by clipping. The mounting plate comprises a plurality of openings or orifices 35 through which hooks 11 of the airbag module 1 are introduced. The module 1 is clipped onto the mounting plate 3 by an elastic retainer 30 which interacts with the hooks 11 in an interaction zone at the openings 35. According to the variant embodiment shown, the elastic retainer 30 is mounted on the mounting plate 3; nonetheless, it is possible to conceive of variant embodiments in which the elastic retainer 30 is mounted on or integral with the frame 2 of the steering wheel and/or the airbag module 1. Likewise, the mounting system may be conceived of without the mounting plate 3.

[0041] As shown in FIG. 2, the elastic retainer 30 comprises first portions 31 which extend through the openings 35 in the mounting plate 3. When the airbag module 1 is mounted on the mounting plate 3, the first portions 31 of the elastic retainer 30 are engaged in the hooks 11 of the airbag module 1 such that it is no longer possible to withdraw the hooks 11 without disengaging the first portions 31 of the elastic retainer 30. This assembly ensures the airbag module 1 is held on the steering wheel 2, inter alia when the airbag is deployed.

[0042] According to the invention, the elastic retainer 30 comprises a second portion 32 located between the first portions 31 and guide means 34 of a removal tool. In the embodiment presented, the guide means 34 form, together with the elastic retainer, two distinct removal paths 39 for guiding a tool for removing the device for removably mounting the airbag module. During the removal, the removal tool is introduced through an opening 41 present on the steering wheel and is guided by the guide means 34 along the two removal paths.

[0043] According to the invention, the steering wheel comprises a single opening. Thus, during the removal of the airbag module, the removal tool is introduced a first time through the opening of the steering wheel and follows the first removal path, and a second time through the same opening and follows the other removal path.

[0044] The removal tool is displaced along the two removal paths formed by the guide means 34 until it reaches the second portions 32 of the elastic retainer 30. The removal tool then causes the displacement of the first portions 31 of the elastic retainer 30 out of the zone of interaction with the hooks 11 by acting on the second portions 32 of the elastic retainer. The action applied successively by the removal tool on each second portion 32 of the elastic retainer to successively displace each first portion is either a pushing, a pulling, a pivoting or a combination of these three movements.

[0045] According to a variant embodiment, the two removal paths are also formed by the second portions 32 of the elastic retainer 30. The two removal paths have for example rectilinear trajectories. According to the variant embodiment shown, the two paths have trajectories which intersect for example in the form of a V. The tip of the V corresponds substantially to the position of the introduction opening of the steering wheel.

[0046] This introduction opening of the steering wheel is placed on the outer part of the steering wheel so as to be accessible from the outside for a user using the removal tool.

[0047] The mounting device may comprise a blocking element 37 in order to protect the second portions 32 of the elastic retainer when the removal tool is introduced through the opening. The blocking element comprises for example a wall 37 placed between the two removal paths. This wall 37 also makes it possible to lock the movement of the elastic retainer 30 in the direction of introduction of the removal tool 4.

[0048] According to the variant embodiment shown, the elastic retainer 30 is open, the first portions then forming the free ends of the elastic retainer 30. The use of an open elastic retainer 30 makes it possible to reduce the force to be exerted on the second portion 32 to cause the displacement of the first portions 31.

[0049] The removal device can also comprise at least one guide stud 38 arranged in the vicinity of the elastic retainer 30. According to one embodiment, each guide stud 38 is positioned between the first and second portions 31, 32. The guide studs 38 provide the positioning of the elastic retainer 30 on the plate during the force applied by the removal tool for inducing the rotational movement of the first portion 31 of the elastic retainer.

[0050] According to the variant embodiment shown in the figures, the guide studs 38 and/or the blocking element 37 and/or the guide means 34 and the pivot studs 33 and/or the guide studs 34 are formed on the mounting plate 3.

[0051] Nonetheless, according to other variant embodiments, the guide means may be formed on the frame 2 of the steering wheel and/or on the airbag module 1. In this embodiment, the mounting plate 3 is not necessary, sine the openings 35 are formed in the central part of the steering wheel or the airbag module.

[0052] The elastic retainer 30 and/or the first and second portions of the elastic retainer 30 are held on the mounting plate 3 by locking means 36. These locking means 36 ensure the elastic retainer is held in a plane substantially parallel to the mounting plate 3, while keeping it free to be displaced within this plane. In other words, the elastic retainer 30 or the first and second portions 31, 32 of the elastic retainer 30 cannot be displaced in a direction perpendicular to the mounting plate 3.

[0053] According to the variant embodiment shown, the locking means 36 are in the form of L-shaped hooks originating from the mounting plate 3. First hooks 36 are arranged on either side of the openings 35. These first hooks ensure the correct positioning of the first portions 31 of the elastic retainer 30 during the operation for mounting the airbag module. These first hooks 36 also ensure the guiding of first portions 31 during the unlocking.

[0054] According to another variant embodiment, the locking means 36 may originate from the frame 2 of the steering wheel and/or on the airbag module 1. In this embodiment, the mounting plate 3 is not necessary, sine the openings 35 are formed in the central part of the steering wheel or the airbag module.

[0055] FIG. 3 shows the mounting device according to the invention in an intermediate unlocking position in which just one of the two first portions is displaced out of the zone of interaction with the hooks. The removal tool 4 is introduced through the opening along the removal path on the right in FIG. 3. Pushing the removal tool toward the top of the figure and/or rotating it in the anti-clockwise direction of the figure causes rotation of the first portion 31.

[0056] In order to completely unlock the module, all that is required is to repeat the operation on the left-hand side, introducing the removal tool 4 through the single removal opening 41 of the steering wheel, for example at the intersection point S of the removal paths.

[0057] It will be understood that various modifications and/or improvements obvious to those skilled in the art can be made to the different embodiments of the invention described in the present description, without going beyond the scope of the invention as defined by the appended claims.