AIRBAG MODULE

Abstract

An airbag module (10) comprises an airbag (12) including two outer wall layers (18) which are interconnected at a circumferential joint (22) along a circumferential edge (20) of the airbag (12) and which delimit an interior of the airbag (12) fillable with gas, wherein an opening (26) which is in fluid communication with the fillable interior of the airbag (12) is provided in the circumferential joint (22), and a plug (14) which is permanently inserted in the opening (26). The plug (14) includes a passage (16), and an outer circumferential surface (32) of the plug (14) is sealed against an inner edge (28) of the opening (26).

Claims

1-10. (canceled)

11. An airbag module (10) comprising an airbag (12) including two outer wall layers (18) which are interconnected at a circumferential joint (22) along a circumferential edge (20) of the airbag (12) and which delimit an interior (24) of the airbag (12) fillable with gas, wherein an opening (26) that is in fluid communication with the fillable interior (24) of the airbag is provided in the circumferential joint (22), wherein a plug (14) that includes a passage (16) is permanently inserted in the opening (26), and wherein an outer circumferential surface (32) of the plug (14) is sealed against an inner edge (28) of the opening (26).

12. The airbag module (10) according to claim 11, wherein in the passage (16) a gas conduit (30) is inserted which is in fluid communication with an inflator and which guides the filling gas from the inflator into the interior (24) of the airbag (12), wherein the gas conduit (30) has at least one outlet opening (43) through which filling gas flows out of the gas conduit (30).

13. The airbag module (10) according to claim 12, wherein the gas conduit (30) is part of a gas lance connected to the inflator, part of a gas conducting element disposed on the inflator or part of the inflator itself.

14. The airbag module (10) according to claim 12, wherein the gas conduit (30) is sealed against an inner wall (44) of the passage (16).

15. The airbag module (10) according to claim 12, wherein the gas conduit (30) includes a rigid outer wall (46) at least in the area of the passage (16).

16. The airbag module (10) according to claim 11, wherein, at the inner edge (28) of the opening (26), the outer wall layers (18) are flatly adjacent to the outer circumferential surface (32) of the plug (14).

17. The airbag module (10) according to claim 11, wherein the plug (14) includes at least one sealing lip (36) on its outer circumferential surface (32).

18. The airbag module (10) according to claim 11, wherein, on its outer circumferential surface (32), the plug (14) is bonded or welded to the inner edge (28) of the opening (26).

19. The airbag module (10) according to claim 11, wherein the opening (26) is formed by an interruption in the circumferential joint (22).

20. The airbag module (10) according to claim 11, wherein the circumferential joint (22) extends linearly in the area of the opening (26).

Description

BRIEF DESCRIPTION OF THE FIGURES

[0023] In the following, the invention shall be described in detail by way of plural example embodiments with reference to the enclosed drawings, wherein:

[0024] FIG. 1 schematically shows a cutout of an airbag module according to the invention comprising an airbag and a plug to be mounted thereon according to a first embodiment;

[0025] FIG. 2 schematically shows the two outer wall layers of the airbag from FIG. 1;

[0026] FIG. 3 shows a side view of the plug from FIG. 2;

[0027] FIG. 4 shows the plug from FIG. 3 with an inserted gas conduit; and

[0028] FIGS. 5 and 6 show different views of a plug of an airbag module according to the invention as set forth in a second embodiment.

DETAILED DESCRIPTION

[0029] FIG. 1 illustrates an airbag module 10 comprising an airbag 12 and a plug 14 having a passage 16 that extends along an axial direction A. FIG. 1 illustrates the individual components prior to assembly. In the completed airbag module 10, the plug 14 is inserted tightly and permanently in the airbag 12.

[0030] The airbag 12 includes, as conventionally known, two superimposed outer wall layers 18 (see FIG. 2) which are interconnected in a gastight manner along a circumferential edge 20 by means of a circumferential joint 22 so that they enclose an interior 24 of the airbag 12 fillable with gas.

[0031] The circumferential joint 22 is produced, e.g., by sewing, weaving, bonding or welding the two outer wall layers 18 to each other.

[0032] In a portion of the circumferential joint 22 extending linearly in this case, an opening 26 is provided that is formed by the circumferential joint 22 being interrupted in this area of the circumferential edge 20 and, hence, the two outer wall layers 18 not being fixed directly to each other.

[0033] The opening 26 extends completely through the circumferential joint 22 into the interior 24 of the airbag 12 and thus provides a fluid communication from the ambience of the airbag 12 to the interior 24 thereof.

[0034] A width b of the circumferential joint 22 usually ranges from few millimeters to few centimeters, when viewed from the actual circumferential edge 20 into the surface area of the airbag 12, which is predetermined by the geometry and the manufacturing mode of the airbag 12. An inner edge 28 of the opening 26 correspondingly extends toward the surface area of the airbag 12 over the same dimensions.

[0035] Along the circumferential edge 20, a length a of the opening 26 is defined by the desired type of the gas supply for the airbag 12, as the dimensions of the plug 14 naturally have to be adapted to the dimensions of a gas conduit 30 (see FIG. 4) which is to be passed through the passage 16 into the interior 24 of the airbag 12.

[0036] An outer circumferential surface 32 of the plug 14 is provided with a structure 34 that facilitates a gastight connection between the outer circumferential surface 32 and the inner edge 28 of the opening 26.

[0037] In the first embodiment shown in FIGS. 1 to 4, said structure 34 is materialized by a number of sealing lips 36 arranged in series in the axial direction A.

[0038] In the second embodiment shown in FIGS. 5 and 6, the structure 34 is an adhesive surface 38 to which a suitable adhesive is applied. Optionally, the adhesive surface 38 may be a recess or an elevation.

[0039] It is also possible, of course, to combine plural fastening techniques and to provide, for example, sealing lips 36 additionally with a suitable adhesive. It would also be imaginable to weld, alternatively or additionally, the inner edge 28 of the opening 26 with the outer circumferential surface 32 of the plug 14.

[0040] The plug 14 is tightly connected to the airbag 12 by inserting the plug 14 along the axial direction A into the opening 26 and connecting the same over the entire circumference of the outer circumferential surface 32 to the outer wall layers 18 in a gastight manner.

[0041] Accordingly, the structure 34 facilitates the sealing between the outer circumferential surface 32 of the plug 14 and the inner edge 28 of the opening 26. Via the structure 34, the plug 14 is also connected to the airbag 12 in a tight and non-destructively detachable manner, either by form closure or, alternatively or additionally, by adhesive bond.

[0042] Optionally, the plug 14 includes a retaining plate 40 having a larger diameter than the remaining plug 14 which is provided at the axial end of the plug 14 that is not inserted into the opening 26. The retaining plate 40 prevents the plug 14 from being inserted too far into the opening 26. In the mounted state, the retaining plate abuts against the outer edge 41 of the opening 26 on the circumferential edge 20.

[0043] In the completed airbag module 10, the passage 16 inside the plug 14 forms a fluid communication from the ambience of the airbag 12 to the interior 24 thereof.

[0044] The outer circumferential surface 32 of the plug 14 in cross-section may have a surface of any shape such as circular, oval or elliptical. Here is shown an elliptical shape which tapers at each end of the long axis. The cross-sectional area is thus adapted to the shape of the opening 26 formed between the two superimposed outer wall layers 18 and to the lateral transition thereof to the adjacent portions of the circumferential joint 22.

[0045] Also, the cross-sectional area of the passage 16 can be selected at will.

[0046] After the plug 14 is tightly connected to the airbag 12, a fitting gas conduit is inserted through the passage 16 into the interior 24 of the airbag 12.

[0047] The gas conduit 30 is appropriately connected to an inflator (not shown) which supplies the filling gas for inflation of the airbag 12.

[0048] The gas conduit 30 is, for example, a so-called gas lance that is connected to an inflator arranged remote from the airbag 12, but it can also be part of the inflator itself or any other gas conducting element which is appropriately fluid-communicated with an inflator.

[0049] In the example shown in FIG. 4, the gas conduit 30 is a gas lance which, apart from an outlet area 42 having a plurality of individual outlet openings 43 at its axial end located in the airbag 12, is configured to be gastight.

[0050] An inner wall 44 of the passage 16 inside the plug 14 is configured so that a gastight connection to a rigid outer wall 46 of the gas conduit 30 can be established. For example, a suitable sealing structure, especially including sealing lips, may be provided, but also an adhesive bond is imaginable, for example.

[0051] Of course, the gas conduit 30 may also be pre-assembled on the plug 14 when the plug is fixed in the opening 26 of the airbag 12.

[0052] Additional securing of the plug 14 or the gas conduit 30 on the airbag 12 is not provided.