Textile surface element of an airbag

Abstract

The invention relates to a textile surface element (F) of an airbag, which is attached with a first area (F1) to the inside of an activation channel of the airbag and with a second area (F2) to the underside of a flap of the airbag (1), where the connection between the first and second areas forms a joint (11), and where the joint has threads (a) of the basic structure of the surface element and, additionally, stop threads (b) having a different, in particular higher, tensile strength compared to the threads of the basic structure of the textile surface element that form the sacrificial threads (c), where the stop threads (b) and the sacrificial threads (c) are arranged not only in the area of ​​the joint (11) but distributed over the entire surface of the textile surface element (F).

Description

[0001] The invention relates to an airbag with a textile surface element which is attached with a second area to the inside of an airbag firing channel and with a first area to the underside of an airbag flap, wherein the connection between the first and the second area forms a joint which has threads of the basic structure of the surface element, sacrificial threads and additionally stop threads which have a greater tensile strength than the sacrificial threads.

[0002] From EP 2 057 044 B1, which forms the preamble of claim 1, it is known to provide the textile surface element of a textile hinge of an airbag with stop threads in addition to the basic textile structure. These stop threads do not break after the airbag is deployed, so that the airbag flap(s) do not enter the passenger compartment of the vehicle. During the manufacture of the airbag, great care must be taken to ensure that the hinge area precisely aligns with the area of ​​the surface element where the stop threads are located.

[0003] WO2013110250A1 discloses a cover for an airbag with at least one airbag cover, which is hinged to the fixed cover area surrounding the airbag cover by a textile hinge, wherein the compaction of stop threads is achieved by arranging them in a wave-like or loop-like manner in the hinge area. Waves and loops also include serpentine, meandering, helical, or coiled shapes of the stop thread.

[0004] The object of the invention is to simplify the manufacture of an airbag and to improve the effect of the stopper threads.

[0005] This problem is solved according to the invention by the features of claim 1. The stop threads and the sacrificial threads are arranged not only in the area of ​​the joint, but distributed throughout the entire surface of the textile element, and the stop threads each form a helix that extends along the entire length of the respective stop thread.

[0006] In the prior art, the stop threads are only located in the area of ​​the joint, so during airbag manufacturing, care must be taken to ensure that the joint is positioned precisely in the area where the stop threads are located on the surface element. With the new, full-surface distribution of the stop threads across the surface element, any area of ​​the surface element can be used for the joint, making production simpler and more error-free.

[0007] Preferably, the stop threads are evenly distributed over the entire surface of the textile surface element.

[0008] It is particularly advantageous if threads of the basic structure and / or the sacrificial threads are arranged on one side surface of the textile surface element, and the stop threads are arranged on the opposite side surface of the textile surface element.

[0009] Furthermore, it is proposed that the textile surface element be embedded in the plastic of the airbag flap and the shot channel wall.

[0010] Because the stopper threads form a helix, a greater stretching distance of the stopper threads is achieved when the flap is opened.

[0011] An embodiment of the invention is schematically illustrated in the drawings and is described in more detail below. The drawings show... Fig. 1 shows a section through an airbag device, Fig. 2 shows a schematic representation of the threads in the textile surface element when the plastic of the surface element is omitted.

[0012] The airbag assembly has a chamber 12 that receives the impact cushion 7 and forms the firing channel. This chamber is surrounded by firing channel walls 9 and closed by a cover 2 which has predetermined breaking lines 2a. The cover 2, with its flap area, forms an airbag passage opening when, after deployment of the impact cushion 7, the cover 2 tears open along the predetermined breaking lines and folds outwards. The flap 1 formed by the cover 2 remains attached to the rest of the cover by an edge that forms a hinge 11.

[0013] The cover 2 is covered by a foam layer 5, on the outside of which a decorative surface material 6 rests.

[0014] On the underside of the cover 2, at least one first region F1 of a textile surface element F is attached, wherein the textile surface element comprises threads a of a base structure embedded in plastic, sacrificial threads c and stop threads b in the region of the joint 11, which are not intended to break and therefore have a higher tensile strength than the threads a of the base structure, in particular than the sacrificial threads. The textile surface element F has a thin plastic layer in which the threads a, b, and c are embedded.

[0015] The cover 2 can be injection-molded onto the first area F1. The material of the airbag flap 1 and the manufacturing process are described in EP 2 727 775 A1.

[0016] The first area F1 of the textile surface element F is connected to the airbag flap or to the area of ​​the cover 2 forming the airbag flap 1, with the threads a,b,c penetrating the plastic of the cover 2.

[0017] The airbag penetration opening is, as in Fig. 1 The airbag is shown closed by a single airbag flap 1, which has the hinge point 11. However, two airbag flaps with hinge points located on opposite sides can also be arranged. The airbag flap(s), in particular the second section F2, is / are each formed via the hinge point 11 onto the second section F2, which forms a flap support wall that extends into the interior of the chamber 12 and thus the firing channel. Here, the second section F2 rests against the inner surface of the firing channel wall 9 and is attached to it, in particular by being formed onto it.

[0018] It is essential that the stop threads b and the sacrificial threads c are arranged not only in the area of ​​the joint 11, but also across the entire surface of the textile surface element F, and thus evenly distributed across both areas F1 and F2. Preferably, threads of the basic structure a and / or the sacrificial threads b are arranged on one side surface of the surface element F, and the stop threads are arranged on the opposite side surface of the surface element.

[0019] The stopper threads b are helical or screw-shaped along their entire length, i.e., they form a helix / screw, as in Figure 2 depicted.

Claims

1. Airbag with a textile sheet element (F) that is fixed with a second area (F2) to the inner side of an airbag chute and with a first area (F1) to the underside of an airbag flap (1), wherein the connection between the first and the second area (F1, F2) forms a hinge (11) comprising threads (a) of a basic structure of the sheet element (F), sacrificial threads (c) and in addition stop threads (b) which have a greater tensile strength than the sacrificial threads (c), wherein the stop threads (b) and the sacrificial threads (c) are arranged not only in the area of the hinge (11) but are distributed over the entire extent of the textile sheet element (F), characterized in that the stop threads (b) each form a helix that extends across the entire length of the respective stop threads (b).

2. Airbag according to claim 1, characterized in that the stop threads (b) are distributed evenly over the entire extent of the textile sheet element (F).

3. Airbag according to claim 1 or 2, characterized in that threads (a) of the basic structure and / or the sacrificial threads (c) are arranged on one side surface of the textile sheet element (F), and the stop threads (b) are arranged on the opposite side surface of the textile sheet element (F).

4. Airbag according to one of the preceding claims, characterized in that the textile sheet element (F) is embedded in the plastic of the airbag flap (1) and the wall (9) of the chute.

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