Airbag fabric

Abstract

An airbag fabric (20) for an airbag has a fastening region (22) for fastening the airbag. The fastening region (22) has a primary load portion (26) with a primary fastening opening (24) and has a transition portion (28). The primary load portion (26) and the transition portion (28) have different bindings. Furthermore, the fastening region (22) has at least one secondary load portion (54) with a secondary fastening opening (62). When the airbag is installed, the primary load portion (26) and the least one secondary load portion (54) lie on one another and form the fastening region (22) in a multi-layered manner. Furthermore, the primary fastening opening (24) is at least partially aligned with each corresponding secondary fastening opening (62).

Description

[0001] Gasbag fabric

[0002] The invention relates to a gas bag fabric for a gas bag, with a fastening area for fastening the gas bag.

[0003] Gasbag fabrics for gasbags are well known.

[0004] Furthermore, it is known to design such airbag fabrics with fastening areas by means of which a corresponding airbag is attached, for example, to a steering wheel or to a roof frame in the case of a head-side airbag, and is held in place during inflation. When the airbag is deployed in this way, the fastening areas are subjected to significant stress in a defined direction and must therefore be designed to be particularly tear-resistant. To ensure particularly high tear resistance in this area, these fastening areas are often reinforced with additional fabric layers or metal fittings.

[0005] Such reinforcements have the disadvantage that the production of the gas bag fabric involves a great deal of effort and thus the gas bags become more voluminous.

[0006] The object of the invention is to provide a gas bag fabric for a gas bag with a fastening area which meets particularly high requirements for tear resistance and is of simple design.

[0007] The problem is solved by a gas bag fabric for a gas bag, with a fastening area for fastening the gas bag. The fastening area has a primary fastening opening, a primary loading section which borders on the primary fastening opening in one loading direction or in which the primary fastening opening is completely arranged, and a transition section which borders on the primary loading section opposite to the loading direction. The primary loading section and the transition section have different weaves. Furthermore, the fabric in the primary loading section has a lower displacement strength than in the transition section, so that a fiber bead is formed from the fabric fibers of the primary loading section, which borders on the primary fastening opening in the loading direction when a hole bearing load acts on the primary fastening opening in the loading direction.Furthermore, the fastening area has at least one secondary loading section with a secondary fastening opening. Each secondary loading section is integrally connected to the primary loading section via at least one fold or bend. In the assembled state of the gas bag, the primary loading section and the at least one secondary loading section lie on top of one another, forming the fastening area in multiple layers, and the primary fastening opening is aligned, at least in sections, with each corresponding secondary fastening opening.

[0008] For the purposes of the application, the term "weave" refers to the weave of the fabric, i.e., the systematic way in which the warp threads are interlaced with at least one weft thread to form the fabric. Furthermore, the resistance to displacement refers to the resistance that must be overcome to shift the threads of the fabric relative to each other.

[0009] In the state of the art, the fastening areas are formed with bonds that have a particularly high resistance to displacement and thus retain their structure even under high loads.

[0010] It was recognized that by a defined reduction in the displacement strength in the section subject to the hole bearing load in the restraint case, a fastening area can be created with increased fracture strength. This is the result of a fiber bead that forms as a result of the relative displacement of the fabric threads, providing a larger contact surface against which a fastener can rest. This fastener extends through the fastening opening and through which the hole bearing load acts on the fabric. The larger contact surface reduces the pressure acting on the fastening area for a given force in the loading direction, allowing the fastening area to absorb a greater load before it tears or breaks.In other words, by shifting the fabric threads to form a fiber bead, a larger number of fabric threads are in contact with the fastener at the same time and thus represent a greater resistance that must be overcome to break through the fabric than would be the case if the fabric had the same weave as the transition region.

[0011] Thus, a local weakening in the form of reduced displacement strength of the load section leads to a fastening area that can absorb a higher load overall.

[0012] Furthermore, the at least one secondary load-bearing section reinforces the primary load-bearing section in the form of an additional layer, without requiring separate fabric layers or sections. This gives the fastening area a particularly high tear resistance while allowing it to be manufactured with minimal effort.

[0013] In particular, the load-bearing section can be designed without separate fabric layers or metal fittings.

[0014] In one embodiment, each secondary fastening opening is arranged entirely within the corresponding secondary load section. This allows the secondary fastening opening to be reliably formed within the secondary load section, even with comparatively large manufacturing tolerances, simplifying manufacturing.

[0015] In a further embodiment, the fastening region has at least one primary retaining opening, which is arranged at least partially in the primary loading section, and each secondary loading section has a corresponding secondary retaining opening for each primary retaining opening. In the assembled state, each primary retaining opening is aligned at least partially with each corresponding secondary retaining opening. Thus, a retaining element can be threaded through the primary retaining opening and each associated secondary retaining opening with little effort during assembly.

[0016] In this case, it can be provided that the at least one primary retaining opening is formed by a slot, in particular a slot that extends from the transition section into the primary loading section. This design has the advantage that, compared to a circular hole, the slot only cuts through the tissue in a very limited area, thus weakening it. Furthermore, the slot can be designed to clamp retaining elements inserted into it, thereby securing them securely during assembly.

[0017] Additionally or alternatively, each secondary retaining opening may be formed by a through hole, thereby simplifying assembly.

[0018] Furthermore, each secondary retaining opening can be arranged entirely in the secondary loading section, so that even with large manufacturing tolerances, each secondary retaining opening can be arranged reliably and with little effort in the secondary loading section.

[0019] According to one embodiment, the fastening area is designed without seams and can therefore be manufactured with particularly little effort.

[0020] According to a further embodiment, the primary loading section and the at least one secondary loading section are each formed as a single layer. This design is particularly simple, space-saving, and cost-effective to manufacture.

[0021] Furthermore, it can be provided that the weave of the primary load-bearing section has a first knot density and the transition section has a weave with a second knot density. The first knot density is lower than the second knot density. The knot density defines the number of knots per area of ​​the fabric. For the purposes of the application, knots are points at which warp threads and weft threads cross. In particular, a point at which two or more parallel warp and / or weft threads cross, as is the case, for example, with a Panama weave, is regarded as a single knot, regardless of the number of threads that cross at that point. Due to the reduced number of knots, the weave of the primary load-bearing section has a lower displacement resistance than the weave of the transition section.

[0022] In this case, the first knot density can be a maximum of 50%, in particular a maximum of 34%, of the second knot density, whereby a particularly effective fiber bead is formed under load.

[0023] In a further embodiment, the fabric of the primary load section has a tear propagation resistance which is at least 150%, in particular at least 200%, of the tear propagation resistance of the fabric of the transition section, so that an effective fiber bead is reliably formed under load.

[0024] In one embodiment, the weave of the at least one secondary load-bearing section has the first knot density and / or the same weave as the primary load-bearing section. This allows the fastening area to be manufactured with minimal effort.

[0025] Furthermore, the warp threads of the weave of the primary loading section can extend perpendicular or parallel to the loading direction. This allows either the warp threads or the weft threads to extend perpendicular to the loading direction and can thus be shifted particularly effectively to form a fiber bead.

[0026] According to one embodiment, the weave of the primary load-bearing section is a Panama weave, which has a particularly low knot density due to its systematic nature.

[0027] According to a further embodiment, the transition section transitions into a gas bag chamber section, which forms a wall of an inflatable chamber. As a result, the fastening area is integrally connected to the gas bag chamber section. Thus, the gas bag has particularly high structural strength.

[0028] The airbag fabric can be a one-piece woven (OPW) fabric, in which the threads of opposite walls of an inflatable chamber merge into a common weave at the edges. This means that the entire airbag fabric is formed in one piece, thus making it particularly simple to design.

[0029] Further advantages and features are evident from the following description and the attached drawings. These show:

[0030] - Figure 1 shows a schematic sectional view of part of a gas bag with a gas bag fabric,

[0031] - Figure 2 shows a detailed view of a fastening area of ​​the gas bag fabric from Figure 1,

[0032] - Figures 3 to 5 each show a detailed view of further embodiments of a fastening area of ​​the gas bag fabric from Figure 1,

[0033] - Figure 6 is a schematic sectional view of a (6 / 6) Panama weave,

[0034] - Figure 7 is a detailed view of a fastening area of ​​the gas bag fabric from Figure 1 with cutting lines lying within a tolerance range,

[0035] - Figure 8 shows a detailed view of a further embodiment of a fastening area of ​​the gas bag fabric,

[0036] - Figure 9 shows a gas bag with further embodiments of a

[0037] Fastening area of ​​the gas bag fabric,

[0038] - Figures 10 and 11 each show a detailed view of the fastening areas of the gas bag fabric from Figure 9,

[0039] - Figure 12 shows a detailed view of the fastening area of ​​a gas bag fabric according to the invention, wherein the fastening area is unfolded, and

[0040] - Figure 13 shows the fastening area from Figure 12 in a folded state for assembly.

[0041] The following detailed description, taken in conjunction with the accompanying drawings, in which like numerals refer to like elements, is intended to describe various embodiments of the disclosed subject matter and is not intended to be the only embodiments. Each embodiment described in this disclosure is merely exemplary or illustrative and should not be construed as preferred or advantageous over other embodiments.

[0042] All features disclosed below with respect to the embodiments and / or the accompanying figures may be combined alone or in any sub-combination with features of the aspects of the present disclosure, including features of preferred embodiments, provided that the resulting combination of features is meaningful to a person skilled in the art.

[0043] Figure 1 shows a gas bag 10 which is formed from a gas bag fabric 20.

[0044] The gas bag 10 has an inflatable chamber 12, which is delimited by opposing walls 14, 16, and an edge 18 with a fastening area 22.

[0045] Of course, the gas bag 10 can have any number of fastening areas 22.

[0046] In the illustrated embodiment, the airbag 10 is a one-piece woven (OPW) airbag. This means that the airbag fabric 20 is a piece of OPW fabric manufactured using a weaving process, also referred to as the OPW process.

[0047] The two walls 14, 16 form two parallel woven layers, the threads of which are combined in the edge 18 to form a common weave, i.e., they intertwine. The edge 18 thus comprises twice the number of threads, while the walls 14, 16 each have a single number of threads.

[0048] The tongue-shaped fastening area 22 is provided for fastening the gas bag 10 by means of fastening means (not shown), wherein the gas bag 10 is held back in a loading direction B during inflation.

[0049] As shown in Figure 2, the attachment area 22 has a fastening opening 24 and a loading section 26 extending away from the attachment opening 24 in the loading direction B, and a transition section 28 extending opposite the loading direction B from the attachment opening 24 and the loading section 26 to the inflatable chamber 12. The loading section 26 and the transition section 28 together surround and define the attachment opening 24.

[0050] The transition section 28 merges into the edge 18 and then into the walls 14, 16 in one piece.

[0051] Furthermore, the fastening region 22 has an edge section 30 which, together with the transition section 28, surrounds the loading section 26 in the form of a closed, circumferential frame.

[0052] The transition section 28 and edge section 30 have the same binding.

[0053] In an alternative embodiment, the weave of the edge portion 30 may differ from the weave of the transition portion 28.

[0054] The weave of the transition section 28 or the edge section 30 is a weave with a high resistance to displacement, such as a plain weave, in which one warp thread and one weft thread cross in a knot and which is therefore also referred to as a (1 / 1) weave.

[0055] The loading section 26 has a bond which has a lower displacement strength compared to the bond of the transition section 28.

[0056] In the present embodiment, the loading section 26 is formed by two superimposed fabric layers with a (2 / 2) Panama weave, i.e., a weave in which two warp threads and two weft threads intersect in a knot, thus forming a checkerboard pattern whose fields each have a width of two warp threads and two weft threads, respectively. Each of these fields forms a knot.

[0057] The threads of the superimposed fabric layers of the load-bearing section 26 merge integrally into the single-layer woven transition section 28 and the single-layer woven edge section 30, and each have half the thread count of the transition section 28 or the edge section 30 in the corresponding area. As a result, the fastening area 22 is formed as an OPW fabric piece and thus has a particularly simple design. Due to this design with two layers and a (2 / 2) Panama weave, the knot density of the weave of each fabric layer of the load-bearing section 26 is 1 / 8 of the knot density of the plain weave of the transition section 28 or the edge section 30, which are formed as a single layer.

[0058] In principle, the loading section 26 can be designed as desired, as long as it has a lower displacement strength than the transition section 28.

[0059] For example, the loading section 26 may have any number of fabric layers, in particular a single fabric layer or three or more fabric layers.

[0060] Additionally or alternatively, the load section 26 or each fabric layer of the load section 26 can have any weave, in particular a (2 / 2) Panama weave or a (3 / 3) Panama weave.

[0061] In one embodiment, the loading section 26 has a single fabric layer formed by a (6 / 6) Panama weave (see Figure 6), i.e., a weave in which six warp threads 32 and six weft threads 34 cross at a knot K. In the illustrated embodiment, the six warp threads 32 and six weft threads 34 each run in double layers, with three warp threads 32 and weft threads 34 per layer L. Thus, this (6 / 6) Panama weave forms a checkerboard pattern, the fields of which each have a width of three warp threads 32 and three weft threads 34, respectively. Each of these fields forms a knot K.

[0062] In embodiments with a loading section 26 with a single fabric layer, the threads of the loading section 26 preferably merge integrally into the single-layer woven transition section 28 and the single-layer woven edge section 30, as in a loading section 26 with multiple superimposed fabric layers. Thus, the loading section 26, the transition section 28, and the edge section 30 are each formed as a single layer and each have the same thread count. The loading section 26 differs from the transition section 28 and the edge section 30 in the type of its weave, which has a lower resistance to displacement and, in particular, a lower knot density than the weave of the transition section 28 and the edge section 30. In this way, the fastening region 22 can be formed as an OPW fabric piece and can be designed particularly simply.

[0063] Preferably, the knot density of the weave of the load section 26 or of each fabric layer of the load section 26 is at most half, in particular at most 1 / 3 of the knot density of the weave of the transition section 28.

[0064] Furthermore, it is advantageous if the load section 26 has a tear propagation resistance that is at least half greater than the tear propagation resistance of the transition section 28. Preferably, the tear propagation resistance of the load section is at least twice as great as the tear propagation resistance of the transition section 28.

[0065] In principle, the fastening area 22 can have any shape and / or any length in the loading direction B.

[0066] In particular, in an alternative embodiment, the fastening region 22 can form a tensioning strap 44 or a retaining strap, which, for example, influences the deployment behavior of the airbag 10 during inflation of the airbag 10 and / or holds the airbag 10 in a desired position when the airbag 10 is inflated. In this case, the transition section 28 forms a band-shaped section that extends away from the inflatable chamber 12, in particular in the loading direction B. In this way, the fastening region 22 provides the functionality of a tensioning strap 44 or a retaining strap, so that, for example, a separate tensioning strap 44 or retaining strap and / or a separate fastening fitting on the tensioning strap 44 or retaining strap is / are not required.

[0067] In the embodiment shown in Figure 2, the warp threads 32 of the loading section 26 extend parallel to the loading direction B, while the weft threads 34 of the loading section 26 extend perpendicular to the loading direction B.

[0068] In an alternative embodiment, the weft threads 34 of the loading section 26 extend parallel to the loading direction B, while the warp threads 32 of the loading section 26 extend perpendicular to the loading direction B. This is an option that is not limited to the illustrated embodiments.

[0069] In principle, the warp threads 32 or the weft threads 34 can extend at any angle to the loading direction B.

[0070] However, it is advantageous if the warp threads 32 or the weft threads 34 extend at an angle to the loading direction B which is between 60° and 120°, in particular between 80° and 100°, in order to promote the bead formation under load explained later.

[0071] The fastening opening 24 has a circular cross-section.

[0072] In an alternative embodiment, the fastening opening 24 can have any cross-section.

[0073] Furthermore, the fastening opening 24 is arranged such that it borders the loading section 26 and the transition section 28 by 50% of its circumference. Thus, the loading section 26 defines the edge 36 of the fastening opening 24 over a circumferential angle a of 180°.

[0074] Of course, the loading section 26 can be adjacent to the fastening opening 24 over any area or circumferential angle a.

[0075] In an alternative embodiment (see Figure 3), the loading section 26 can only be adjacent to the fastening opening 24 over a circumferential angle a of less than 1 °.

[0076] Preferably, however, the loading section 26 borders on the fastening opening 24 over a circumferential angle a between 60° and 180°.

[0077] In the embodiment shown in Figure 2, the loading section 26 has a rectangular basic shape, the sides of which run parallel or perpendicular to the loading direction B.

[0078] In principle, the loading section 26 can have any shape and / or be oriented in any way relative to the loading direction B.

[0079] In particular, the loading section 26 can have a shape that tapers in the loading direction B, as shown in Figures 3 to 5, which show further embodiments of the gas bag fabric 20 with alternatively designed fastening regions 22.

[0080] In the embodiment shown in Figure 3, the loading section 26 has a basic shape in the form of an isosceles triangle.

[0081] In the embodiment shown in Figure 4, the loading section 26 has a trapezoidal basic shape.

[0082] In the embodiment shown in Figure 5, the loading section 26 has a basic shape formed by a semicircle.

[0083] In all embodiments, the warp and weft threads 32, 34 shift in the loading section 26 when a hole bearing load acts in loading direction B on the edge 36 of the fastening opening 24 adjacent to the loading section 26 through the fastening means extending through the fastening opening 24.

[0084] In contrast to the fabric of the transition section 28, which would tear due to the higher displacement strength due to such a hole bearing load, the warp and weft threads 32, 34 in the loading section 26 are pushed together by the fastening means to form a bead which is composed of the fabric fibers of the warp and weft threads 32, 34.

[0085] This fiber bulge forms a resistant barrier that can only be broken by a particularly large load.

[0086] Measurements with the embodiment shown in Figure 2 have shown that the fastening area 22 can withstand a load twice as high as the fastening area of ​​a gas bag fabric which is designed without a load section 26.

[0087] In Figure 7, the laser cutting lines 42, represented as dashed lines, show the range of permissible tolerances in the cutting, particularly for very large gas bags 10, i.e., gas bags 10 that are very long in the x-direction. As shown in Figure 7, the problem may arise, particularly with such very large gas bags 10, that the fastening opening 24 of the fastening region 22 does not adjoin, or does not adjoin sufficiently, the load section 26 of a fastening region 22 according to Figures 1 to 6 due to the permissible tolerances.

[0088] The embodiment of the fastening region 22 shown in Figure 8 represents an alternative embodiment of the gas bag fabric 20 according to the invention, in which the fastening opening 24 is completely enclosed by the loading section 26, and the loading section 26 directly adjoins the transition section 28, which merges integrally into the edge 18 and then into the walls 14, 16. This alternative embodiment makes it possible to arrange the fastening opening 24 of the fastening region 22 within the loading section 26, taking into account the permissible tolerances when cutting the gas bag 10, and to form a fiber bead under load.

[0089] In such an embodiment, the load-bearing section 26 is preferably formed as a single-layer or double-layer and has a weave that has as few knots K as possible, but sufficient knots K to prevent combing out as a cause of fracture. The choice of weave and thus the number of knots K in the load-bearing section 26 is influenced, for example, by the selected coating of the gas bag fabric 20.

[0090] The type of coating can significantly influence the internal friction in the load-bearing section and thus the choice of knot density. For example, tests with the fastening area 22 in Figure 8 have shown that, for airbag fabrics 20 with a silicone coating, load-bearing sections 26 with a (3 / 3) Panama weave or an even coarser weave per layer exhibit very good breaking strength.

[0091] Figure 9 shows a gas bag 10 having a plurality of fastening areas 22, 22' according to further embodiments. In Figure 9, the fastening areas 22' form the tensioning straps 44 of the gas bag 10.

[0092] Alternatively, the fastening areas 22, 22' of the gas bag 10 can also be connected to a tensioning strap 44 designed as a separate component. The structure of the fastening area for connecting a tensioning strap 44 can also correspond in such an embodiment to the fastening area 22, 22' of the gas bag fabric according to the invention. Figures 10 and 11 show the fastening areas 22 and 22', respectively, in a detailed view.

[0093] In the embodiments illustrated in Figures 10 and 11, the fastening opening 24 is also completely surrounded by the loading section 26. In addition, the fastening region 22 and the fastening region 22' have a collecting section 38.

[0094] The collection section 38 has a third knot density that is equal to the second knot density of the transition section 28 or preferably higher than the second knot density of the transition section 28. In typical embodiments, the collection section 38 is formed as a single layer and has, for example, a (1 / 1) or (2 / 2) Panama weave. Of course, the collection section 38 can also have other weaves, such as a (1 / 2) or (2 / 1) weave.

[0095] Preferably, the first node density of the loading section 26 should be only 2% to 34% of the third node density of the capture section 38, at most 50% of the third node density of the capture section 38.

[0096] In particular, if the collecting section 38 is arranged adjacent to the loading section 26 in a direction of the loading direction (B), the collecting section 38 can easily prevent combing out under load.

[0097] In the embodiment shown in Figure 10, the load-bearing section 26 is formed in two layers, with both layers having a (3 / 3) Panama weave. The collection section 36, on the other hand, is formed by a single-layer (1 / 1) Panama weave. This results in the first knot density of the load-bearing section 26 being only approximately 5% of the third knot density of the collection section 38.

[0098] Figure 11 shows a fastening area 22' which forms a partial area of ​​a tensioning strap 44 of the gas bag fabric 20 of the gas bag 10.

[0099] In the illustrated embodiment, the fastening area 22' is bordered on three sides by collecting sections 38. Of course, such a fastening area 22' can also additionally have a collecting section 38 on the right-hand side in Figure 11, so that the loading section 26 is surrounded by the collecting section 39 in a frame-like manner. This can, for example, support the secure formation of a fiber bead even in a loading direction B that is not aligned parallel or perpendicular to the warp threads 32 or the weft threads 34.

[0100] In the embodiment shown in Figures 9 to 11, the gas bag fabric 20 also comprises a tolerance section 40. This tolerance section 40 is formed by a cost-effective and simple weaving and is introduced into the gas bag fabric during production in the region of the (laser) cutting lines 42 forming the edge of the gas bag 10.

[0101] The size of the tolerance section 40 is selected such that, even taking into account the permissible tolerances when cutting the gas bag 10, it can be guaranteed that the catch section 38 is not severed.

[0102] The embodiments of the fastening regions 22 shown in Figures 8 to 11 can therefore prevent, particularly in the case of very large gas bags 10, the fastening opening 24 of the fastening region 22 from not being adjacent or not being sufficiently adjacent to the loading section 26 or from being surrounded by it.

[0103] A gas bag fabric 20 according to a further embodiment will now be described with reference to Figures 12 and 13. The same reference numerals are used for the components known from the above embodiments, and reference is made to the previous explanations. The fastening opening 24 and the loading section 26 are referred to below as the primary fastening opening 24 and the primary loading section 26, but correspond to the fastening openings 24 and loading sections 26 from the previous embodiments, unless otherwise stated.

[0104] As shown in Figure 12, the attachment region 22 has a primary loading section 26 in which the primary attachment opening 24 is arranged, and a transition section 28 which extends counter to the loading direction B from the primary loading section 26 to the inflatable chamber 12 (see Figure 1).

[0105] The primary load section 26 is part of a primary section 50. Furthermore, the transition section 28, as shown in Figure 1, merges integrally into the edge 18 and then into the walls 14, 16 of the gas bag 10.

[0106] In an alternative embodiment, the transition section 28 may extend away from the primary fastening opening 24 in the loading direction B, as shown in Figures 2 to 5. In this case, the primary loading section 26 and transition section 28 together surround and define the primary fastening opening 24.

[0107] In contrast to the embodiments shown in Figures 1 to 11, the fastening region 22 shown in Figure 12 has two wing sections 51, 52, each with a secondary loading section 54.

[0108] The wing sections 51, 52 are connected in one piece to the primary section 50 via a fold 56 each.

[0109] In an alternative embodiment, the fold 56 may be replaced or supplemented by a bend or a bent section.

[0110] Of course, in a further embodiment, the fastening region 22 can have any number of wing sections 51, 52, in particular only a single one.

[0111] In the present embodiment, the primary loading section 26 and the secondary loading sections 54 each comprise a single fabric layer formed by a (6 / 6) Panama weave (see Figure 6).

[0112] In principle, the primary loading section 26 and the secondary loading sections 54 can each have any weave, in particular a (5 / 5) Panama weave or a (7 / 7) Panama weave, as long as the primary loading section 26 has a weave that has a lower displacement strength compared to the weave of the transition section 28.

[0113] In a further embodiment, the weave of the secondary loading sections 54 has the same knot density as the weave of the primary loading section 26.

[0114] The boundary 58 between the transition section 28 and the loading sections 26, 54 is marked by a line in Figure 12 and in the present embodiment extends into the wing sections 51, 52.

[0115] In an alternative embodiment, the wing sections 51, 52 may be formed entirely by the secondary loading sections 54, so that the boundary 58 only adjoins the primary loading section 26.

[0116] In this context, the fastening region 22 has two primary holding openings 60 in the form of slots, each extending from the primary loading section 26 into the transition section 28.

[0117] The boundary 58 runs through the center of the primary holding opening 60.

[0118] Of course, in an alternative embodiment, the primary holding openings 60 can each be designed and arranged in any desired manner, as long as they are arranged at least partially in the primary loading section 26.

[0119] For example, in an alternative embodiment, the primary retaining openings 60 are circular through-openings.

[0120] Furthermore, any number of primary holding openings 60 can be provided, in particular only one.

[0121] Furthermore, the primary holding openings 60 are optional and can thus be omitted in a further embodiment.

[0122] The wing sections 51, 52 are designed complementarily to the primary section 50, in particular with respect to the openings 24, 60, and accordingly each have a secondary fastening opening 62 and two secondary holding openings 64.

[0123] The secondary fastening openings 62 and the secondary holding openings 64 are each arranged entirely in the corresponding secondary loading section 54.

[0124] In contrast to the slot-shaped primary retaining openings 60, the secondary retaining openings 64 are designed as through holes to facilitate assembly. In the present embodiment, the primary fastening opening 24, the secondary fastening openings 62, and the secondary retaining openings 64 are circular.

[0125] Furthermore, the primary mounting opening 24 and the secondary mounting openings 62 have identical diameters.

[0126] Furthermore, the secondary holding openings 64 have identical diameters.

[0127] In principle, the secondary fastening openings 62 and the secondary holding openings 64 can each be designed in any way as long as they can be arranged relative to the primary fastening opening 24 and the primary holding openings 60 during assembly of the gas bag 10 as described below.

[0128] To assemble the gas bag 10, the wing sections 51, 52 are each folded by means of the fold 56 towards the primary section 50, so that the wing sections 51, 52 and the primary section 50 are arranged in multiple layers, ie, in the direction of view perpendicular to the plane of the drawing in Figure 13, they lie on top of one another or above one another.

[0129] In the illustrated embodiment, the wing section 51 was folded in front of the wing section 52, so that in the assembled state, the wing section 51 is arranged between the primary section 50 and the wing section 52. The edge of the wing section 51 concealed by the wing section 52 is shown in dashed lines in Figure 13.

[0130] In principle, the wing sections 51, 52 can be folded in any desired manner towards the primary section 50 or in register with it. For example, the wing section 51 can first be folded forward, as shown in Figure 13, so that the upper side of the wing section 51 is opposite the upper side of the primary section 50. The wing section 52 is then folded forward onto the wing section 51 so that the upper side of the wing section 52 is opposite the underside of the wing section 51. In all embodiments, however, the fastening region 22 is designed such that, in the folded or assembled state, the secondary fastening openings 62 are at least partially aligned with the primary fastening opening 24 and the secondary holding openings 64 are at least partially aligned with the respectively associated primary holding openings 60.

[0131] In the illustrated embodiment, the primary fastening opening 24 and the corresponding secondary fastening openings 62, as well as the primary holding openings 60 and the corresponding secondary holding openings 64, are each centered or coaxial with one another. This means that the centers of the associated openings are each arranged on a straight line in the axial direction.

[0132] In an alternative embodiment, one or more of the wing sections 51, 52 can be bent towards the primary section 50 so that the corresponding wing section 51, 52 is connected to the primary section 50 via a bend in addition to or alternatively to a fold 56 in the assembled state.

[0133] In a subsequent step, a fastening means is inserted through the primary fastening opening 24 and the secondary fastening openings 62 in order to fasten the gas bag 10 via the fastening area 22, for example to a support fixed to the vehicle.

[0134] The fastener may be a bolt.

[0135] A corresponding number of retaining means are inserted through the primary retaining openings 60 and the associated secondary retaining openings 64 in order to fasten the fastening area 22 or to fasten a component to the fastening area 22.

[0136] The holding means can also be bolts.

[0137] In this context, the fastening area 22 is designed without seams and thus seamless, particularly in both the deployed and assembled states. This provides a gas bag fabric 20 with a fastening area 22, 22' that can absorb large loads and can be manufactured with little effort.

[0138] Furthermore, separate reinforcement elements can be dispensed with.

Claims

Patent claims 1. A gas bag fabric (20) for a gas bag (10), comprising a fastening region (22) for fastening the gas bag (10), wherein the fastening region (22) has a primary fastening opening (24), a primary loading section (26) which borders the primary fastening opening (24) in a loading direction (B) or in which the primary fastening opening (24) is completely arranged, and a transition section (28) which borders the primary loading section (26) opposite to the loading direction (B), wherein the primary loading section (26) and the transition section (28) have different weaves and the fabric in the primary loading section (26) has a lower displacement resistance than in the transition section (28), so that a fiber bead is formed from the fabric fibers of the primary loading section (26), which borders the primary fastening opening (24) in the loading direction (B),when a hole bearing load acts on the primary fastening opening (24) in the loading direction (B), wherein the fastening region (22) has at least one secondary loading section (54) with a secondary fastening opening (62), wherein each secondary loading section (54) is integrally connected to the primary loading section (26) via at least one fold (56) or bend, and wherein, in an assembled state of the gas bag (10), the primary loading section (26) and the at least one secondary loading section (54) lie on top of one another and form the fastening region (22) in multiple layers, and the primary fastening opening (24) is at least partially aligned with each corresponding secondary fastening opening (62).

2. Airbag fabric (20) according to claim 1, characterized in that each corresponding secondary fastening opening (62) is arranged entirely in the corresponding secondary loading section (54).

3. Airbag fabric (20) according to one of the preceding claims, characterized in that the fastening region (22) has at least one primary holding opening (60) which is arranged at least in sections in the primary loading section (26), and each secondary loading section (54) has a corresponding secondary holding opening (64) for each primary holding opening (60), wherein in the assembled state each primary holding opening (60) is at least partially aligned with each corresponding secondary holding opening (64).

4. Gas bag fabric (20) according to claim 3, characterized in that the at least one primary holding opening (60) is formed by a slot, in particular a slot which extends from the transition section (28) into the primary loading section (26).

5. Gas bag fabric (20) according to claim 3 or 4, characterized in that each secondary holding opening (64) is formed by a through hole.

6. Gas bag fabric (20) according to one of claims 3 to 5, characterized in that each secondary holding opening (64) is arranged entirely in the secondary loading section (54).

7. Gas bag fabric (20) according to one of the preceding claims, characterized in that the fastening area (22) is designed without seams.

8. Gas bag fabric (20) according to one of the preceding claims, characterized in that the primary loading section (26) and the at least one secondary loading section (54) are each formed in a single layer.

9. Gas bag fabric (20) according to one of the preceding claims, characterized in that the weave of the primary load section (26) has a first knot density and the transition section (28) has a weave with a second knot density, wherein the first knot density is lower than the second knot density.

10. Gas bag fabric (20) according to claim 9, characterized in that the binding of the at least one secondary loading section (54) comprises the first node density and / or the same weave as the primary loading section (26).

11. Gas bag fabric (20) according to one of the preceding claims, characterized in that the warp threads (32) of the weave of the primary loading section (26) extend perpendicular or parallel to the loading direction (B).

12. The airbag fabric (20) according to one of the preceding claims, characterized in that the weave of the primary load-bearing section (26) is a panama weave.

13. The airbag fabric (20) according to one of the preceding claims, characterized in that the transition section (28) transitions into a gas bag chamber section, which forms a wall (14, 16) of an inflatable chamber (12).

14. Gas bag fabric (20) according to one of the preceding claims, characterized in that the gas bag fabric (20) is a one-piece woven fabric in which the threads of opposite walls (14, 16) of an inflatable chamber (12) merge into a common weave at the edges.

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