Safety belt webbing having heating conductor and safety belt system for vehicle

Abstract

The invention relates to a safety belt webbing (12) for a safety belt system (10) of a vehicle, having a safety belt webbing body (26), which comprises at least one heating conductor (28), which comprises a first strand and a second strand, each of which comprises an electrical insulation, the electrical insulation portion electrically insulates the first strand and the second strand from each other. At a first end of the heating conductor (28), the first strand can be electrically contacted via a first contact (30) and the second strand can be electrically contacted via a second contact (32). At a second end of the heating conductor (28), opposite the first end, there is a strand contact connection point (34) at which the first strand and the second strand are in electrical contact connection. The invention also relates to a safety belt system (10).

Description

Technical Field

[0001] The present invention relates to a seat belt webbing for a vehicle seat belt system, the seat belt webbing comprising at least one heating conductor, and to a seat belt system for a vehicle having such a seat belt webbing. Background Technology

[0002] Seat belt systems are used to secure occupants to their vehicle seats in such a way that during a sudden deceleration of the vehicle, the occupants are decelerated as evenly as possible and prevent contact with other objects in the vehicle, such as the steering wheel or dashboard.

[0003] In addition to safety, efforts are also being made to integrate comfort features, such as heating, into the seat belt webbing.

[0004] As known from DE102020125367A1, a seatbelt webbing with a braided webbing body is provided, the seatbelt webbing body comprising warp yarns extending longitudinally and weft yarns extending transversely to the warp yarns, and at least one heating conductor woven into the seatbelt webbing body as warp and / or weft yarns. The heating conductor is led out of the seatbelt webbing at opposite ends to be connected to an electrical contact of an energy source. If only a sub-area of ​​the seatbelt webbing is to be heatable, a separation position is provided in the seatbelt webbing, at which the heating conductor is cut off, so that the portion of the heating conductor separated from the energy source by the separation position is no longer heatable. Alternatively, the heating conductor may be led out of the seatbelt webbing at this separation position and provided with an insulating portion or a cover, such as a cover made of rubber. Such a solution is associated with high structural costs, which complicates the mass production of seatbelt webbing. Summary of the Invention

[0005] The objective of this invention is to provide a heatable seatbelt webbing and a seatbelt system having such a webbing, which is simple to manufacture and, in particular, enables precise heating of the seatbelt webbing.

[0006] The objective of this invention is achieved by a seatbelt webbing for a vehicle seatbelt system, the seatbelt webbing having a seatbelt webbing body woven from warp and weft yarns and including at least one heating conductor. The heating conductor is constructed as warp yarns and includes a first strand and a second strand, each including an electrically insulating portion that electrically insulates the first and second strands from each other. At a first end of the heating conductor, the first strand is electrically connected via a first contact point, and the second strand is electrically connected via a second contact point. At a second end of the heating conductor opposite to the first end, there is a strand contact connection point where the first and second strands are electrically connected.

[0007] The basic concept of this invention is that all the strands of the at least two electrically heatable strands of the heating conductor can be electrically connected at the same end of the heating conductor, thereby reducing the cost of establishing contact connections between the individual conductors and making the contact connections more robust and durable. Simultaneously, the circuit guided through the strands to the installation position of the seatbelt webbing should be closed via the strand contact connection points. The heatable area of ​​the seatbelt webbing can be flexibly and precisely determined by simply selecting the location of the strand contact connection points, and especially by selecting the strand length between the first contact and the strand contact connection point, or between the second contact and the strand contact connection point.

[0008] Here, the following electrical conductors are understood as strands comprising multiple (at least two) monofilaments that form a common conductor. These monofilaments may extend in parallel, but are typically twisted or braided.

[0009] The electrical insulation between the first and second strands ensures that the electrical connection between them exists only at the strand contact connection point. This ensures that the current flowing through the heating conductor must completely pass through both the first and second strands, thereby reliably heating the heating area of ​​the seatbelt webbing defined by the strand contact connection point during operation.

[0010] To achieve high durability while also taking into account unintentional environmental impacts, all filaments of the first and second strands are electrically insulated from each other. This is advantageously achieved through varnished insulation.

[0011] Each of the monofilaments in the strand is advantageously provided with an enclosing insulating portion. This electrical insulation portion is in particular a varnish coating applied to the respective monofilament. Furthermore, the entire strand may also be provided with an insulating portion, especially a varnish-insulated portion.

[0012] The strand contact connection can be generated by any method capable of reliably connecting the first and second strands. For example, the strand contact connection can be generated by crimping, brazing, or laser welding. It is particularly advantageous here that the contact connection is made in a very narrow space, i.e., without traversing a large distance between two single conductors or without the need for a conductive bridge.

[0013] This reduces both the structural and manufacturing costs of the insulation at the strand contact connection point. The overall strand contact connection point becomes smaller, meaning the spatial extension of the corresponding contact area is significantly reduced.

[0014] The first and second strands can be twisted together. This improves the mechanical stability of the heating conductor and simplifies its integration into the seatbelt webbing body. Electrical insulation between the first and second strands prevents unwanted electrical contact between them along the length of the heating conductor, even with the twisted strands, thus ensuring that electrical contact is only generated between the first and second strands at the point of contact.

[0015] To further simplify the heating conductor, for example by weaving it into the seatbelt webbing body, the first and second strands can be wound as textile yarns. The wound strands form a single yarn in such a way that the single yarn can be woven in like normal warp yarns for use in manufacturing the seatbelt webbing. Furthermore, the coloring of the heating conductor can be adapted to match or specifically differentiated from the remaining warp and weft yarns of the seatbelt webbing by selecting the textile yarns.

[0016] "Textile yarn" is understood here and below to mean yarn that is not a conductive thread or ply.

[0017] For example, textile yarns are synthetic yarns made of polyester or polyamide. This can exist, for example, in fineness between 100 dtex and 350 dtex.

[0018] The first and second strands can be twisted together. Additionally, winding can be provided using the textile yarns.

[0019] Preferably, the first and / or second strands are wound single or double around the textile yarn. In this way, the heating conductor can be effectively provided with the desired textile properties.

[0020] The winding of the textile yarn can have an S-direction twist or a Z-direction twist. If the first and second strands are double-wound with textile yarn, then these two winding portions preferably have a combination of S-direction and Z-direction twists. In other words, preferably, the textile yarn of the first winding portion has an S-direction twist and the textile yarn of the second winding portion includes a Z-direction twist, or vice versa.

[0021] The first and second strands can be wound together and / or independently with textile yarn. Correspondingly, a dual structure is also possible, in which the first and second strands are wound separately with textile yarn, and the wound strands are wound with additional textile yarn, i.e., an upper-level additional common winding portion is provided. Not only the separate winding portions but also the upper-level common winding portions can be implemented independently, either singly or in double layers, as previously described.

[0022] To further improve the tensile load capacity of the heating conductor, the heating conductor may further include a first tensile yarn. In particular, the first tensile yarn, the first strand, and the second strand are twisted together.

[0023] If textile yarn is used to wind the first and second strands, then in this design, the entire structure consisting of the first strand, the second strand, and the tensile yarn is wound in particular.

[0024] The heating power of the seatbelt webbing can be further increased by comprising multiple heating wires in the first and / or second strands, said heating wires being particularly twisted together. Therefore, the current passing through the seatbelt webbing, especially through the heating conductor, can be increased. Simultaneously, the seatbelt webbing itself can continue to be heated by the remaining functional heating wires even if one or more heating wires break.

[0025] The heating wire is also provided with an electrical insulation portion to prevent unwanted electrical contact between the heating wires. In particular, the electrical insulation portion of the corresponding strands can be formed by the electrical insulation portion of the heating wire.

[0026] Furthermore, the first and / or second strands may include a second tensile yarn, particularly the second tensile yarn twisted with the heating wire of the first or second strand. In this way, the tensile load capacity and weavability of the heating conductor can be further improved.

[0027] The difference between the second tensile yarn and the first tensile yarn is that the second tensile yarn is distributed to each individual strand of the heating conductor, while the first tensile yarn is distributed to the heating conductor itself, i.e., the first and second strands. The second tensile yarn corresponds to a finer diameter for the monofilament than the first tensile yarn, thus matching the fineness of the tensile yarn with the diameter of the monofilament or the strand. The diameter of the monofilament is, for example, between 0.025mm and 0.075mm. In the case of, for example, five monofilaments per strand, the diameter of the strand is between 0.125mm and 0.45mm. In the case of double-twisted yarn, the diameter is between 0.25mm and 0.9mm, and in the case of triple-twisted yarn with two strands and one tensile yarn, the diameter is between 0.375mm and 1.35mm.

[0028] To achieve the most uniform heating possible in the seatbelt webbing, the seatbelt webbing may contain two or more heating conductors. In particular, the two or more heating conductors are symmetrically and / or uniformly distributed across the width of the seatbelt webbing.

[0029] The object of the present invention is also solved by a seat belt system for a vehicle having seat belt webbing as described above and an energy source connected to a first contact and a second contact electrical contact of the heating conductor.

[0030] The features and properties of the seat belt webbing according to the present invention are applicable to the seat belt system according to the present invention, and vice versa.

[0031] The energy source is connected to the contacts of the first and second contacts of the heating conductor, and the energy source is correspondingly electrically connected to the seat belt webbing. If the seat belt webbing includes more than one heating conductor, the energy source is connected to the first and second contacts of each heating conductor in the seat belt webbing. Attached Figure Description

[0032] Other features and characteristics of the invention will become apparent from the following description of exemplary embodiments and the accompanying drawings, which should not be construed as limiting. In the drawings:

[0033] - Figure 1 A schematic diagram of a seatbelt system according to the invention, having seatbelt webbing according to the invention, is shown;

[0034] - Figure 2 Show Figure 1 The heating conductor of the first embodiment of the seat belt webbing;

[0035] - Figure 3 Show Figure 1 The heating conductor of the second embodiment of the seat belt webbing;

[0036] - Figure 4 Show Figure 1 The heating conductor of the third embodiment of the seat belt webbing;

[0037] - Figure 5 Show Figure 1 The heating conductor of the fourth embodiment of the seat belt webbing;

[0038] - Figure 6 Show Figure 1 The heating conductor of the second embodiment of the seat belt webbing;

[0039] - Figure 7 Show Figure 6 Details AA;

[0040] - Figure 8 Showing the use of similar Figure 7 Based on the details Figure 3 and 6 Variations of the second embodiment;

[0041] - Figure 9 Show Figure 1 The heating conductor of the fifth embodiment of the seat belt webbing; and

[0042] - Figure 10 Show Figure 1 The sixth embodiment of the seat belt webbing. Detailed Implementation

[0043] Figure 1 A seatbelt system 10 for a vehicle according to the present invention is illustrated schematically.

[0044] The seat belt system 10 includes a seat belt webbing 12, an end fitting 14, a latch 16, a seat belt buckle 18, a steering element 20, a seat belt retractor 22, and a power source 24 according to the invention.

[0045] Energy source 24 here is an electrical energy source, such as a vehicle battery or accumulator.

[0046] The seatbelt webbing 12 is secured to the vehicle at a first end by an end fitting 14 and at a second end opposite to the first end by a seatbelt retractor 22. The seatbelt webbing 12 can be coupled to a seatbelt buckle 18 by a latch 16 movably mounted on it.

[0047] The seatbelt webbing 12 includes a seatbelt webbing body 26 and a heating conductor 28, which is integrated into the seatbelt webbing body 26. In particular, the heating conductor serves as the warp yarn of the seatbelt webbing body 26 and is processed into the fabric composed of the other warp and weft yarns of the seatbelt webbing body 26.

[0048] In the region of the end fitting 14, the heating conductor 28 is connected to the electrical contacts of the energy source 24 via the first contact 30 and the second contact 32.

[0049] The heating conductor 28 extends through a sub-region of the seatbelt webbing 12 to the strand contact connection point 34, which will be described in detail later. The sub-region of the seatbelt webbing 12 through which the heating conductor 28 passes is the heating region 36 of the seatbelt webbing 12.

[0050] In other words, the sub-area of ​​the seatbelt webbing 12 through which the heating conductor 28 passes can be electrically heated, so that the occupant 38 using the seatbelt system 10 can be directly heated through contact with the seatbelt webbing 12.

[0051] Therefore, the seat belt system 10, in addition to its conventional use for securing occupants 38, also has additional comfort features.

[0052] In the illustrated embodiment, the wire contact connection point 34 is configured such that the heating area 36 extends approximately into the shoulder area of ​​the occupant 38.

[0053] Basically, the location of the selected strand contact point 34 along the seat belt webbing 12 can be flexibly determined: which part of the seat belt webbing 12 will be used as the heating zone 36.

[0054] Therefore, it is also feasible for the heating area 36 to extend over almost the entire seat belt webbing 12 or over the entire seat belt webbing 12, in such a way that the strand contact connection point 34 is correspondingly close to or installed at the second end of the seat belt webbing 12.

[0055] exist Figure 2 The heating conductor 28 of the first embodiment of the seat belt webbing 12 is schematically shown, wherein the length of the heating conductor 28 is shown significantly shortened for clarity.

[0056] The heating conductor 28 includes a first conductive wire 40 and a second conductive wire 42.

[0057] For example, the first strand 40 and the second strand 42 are made of carbon fiber, silver wire or metal monofilament.

[0058] The first strand 40 and the second strand 42 each include an electrically insulating portion 44, which covers the first strand 40 and the second strand 42 on their circumferential sides. Therefore, electrical contact will not be established between the first strand 40 and the second strand 42 simply by their mutual contact or twisting.

[0059] The electrical insulation part 44 is, for example, made of an electrically insulating varnish.

[0060] At the first end 46 of the heating conductor 28, a first strand 40 includes a first contact 30 and a second strand 42 includes a second contact 32, through which the heating conductor 28 is electrically connected to the energy source 24 (reference). Figure 1 Correspondingly, in the illustrated embodiment, the first wire 40 is configured to the positive terminal of the energy source 24 and the second wire 42 is configured to the negative terminal of the energy source 24.

[0061] The connection between the corresponding contact 30 or 32 and the energy source 24 can be made by brazing.

[0062] The second end 48 of the heating conductor 28 is formed through a strand contact connection point 34, at which the first strand 40 and the second strand 42 are electrically connected. Correspondingly, the heating conductor 28 provides a current path through the seat belt webbing 12, which leads from the first contact 30 to the strand contact connection point 34 and from the strand contact connection point 34 to the second contact 32. If the current path is energized by the energy source 24, the heating conductor 28 is heated, thereby heating the seat belt webbing body 26 in the heating area 36 starting from the heating conductor 28.

[0063] The wire contact connection point 34 can be generated by any method that ensures a sufficiently stable electrical contact connection between the first wire 40 and the second wire 42. For example, the wire contact connection point 34 can be a crimped part, a brazed part, or a laser-welded part.

[0064] In a first embodiment of the heating conductor 28, the first strand 40 and the second strand 42 are wound with textile yarn 50, so that the textile yarn forms a common winding portion 52, which surrounds not only the first strand 40 but also the second strand 42.

[0065] Inside the common winding portion 52, the first strand 40 and the second strand 42 are twisted together. Thus, the first strand 40, the second strand 42, and the common winding portion 52 form a double-strand twisted yarn, which serves as a heating conductor 28.

[0066] Basically, the first strand 40 and the second strand 42 can also extend side by side within the common winding portion 52, that is, they do not twist together.

[0067] The textile yarn 50 is made of a non-conductive material. Specifically, the textile yarn 50 uses the same yarn used in the seatbelt webbing body 26 as the heating conductor 28. In this way, the characteristics of the heating conductor 28 are adapted to the mechanical properties of the rest of the seatbelt webbing body 26. This further simplifies the integration of the heating conductor 28 into the seatbelt webbing body 26 and ensures the most uniform characteristics of the seatbelt webbing 12 throughout the entire seatbelt webbing body 2.

[0068] For example, textile yarn 50 is polyester yarn.

[0069] exist Figure 2In the embodiment shown, the first strand 40 and the second strand 42 are simply wound with textile yarn 50. Essentially, the first strand 40 and the second strand 42 may also be wound with textile yarn 50 in double or more layers. In this case, the first strand 40 and the second strand 42 are preferably double-wound with textile yarn 50, one layer of the formed winding includes an S-direction twist and the other layer of the formed winding includes a Z-direction twist.

[0070] The thickness of the heating conductor 28 substantially corresponds to the thickness of the woven warp yarns processed in the seatbelt webbing body 26. The thickness or diameter of the heating conductor is advantageously in the range of 0.5 to 1.2 times the diameter of the woven warp yarns.

[0071] exist Figures 3 to 9 Other embodiments of the heating conductor 28 are schematically illustrated, and then discussed further. These other embodiments correspond substantially to one another, thus only emphasizing the differences between them, and unless otherwise stated, the features and characteristics of each embodiment are similarly applicable to the remaining embodiments. The same reference numerals denote the same or functionally identical components.

[0072] exist Figure 3 The diagram shows a second embodiment of the heating conductor 28, in which the first strand 40 and the second strand 42 are wound independently of each other with textile yarn 50, such that the first strand 40 is received in the first winding portion 54 and the second strand 42 is received in the second winding portion 56.

[0073] The first strand 40 and the second strand 42, together with their respective winding portions, that is, the first winding portion 54 or the second winding portion 56, are twisted together, thereby the heating conductor 28 is constructed as a double-strand twisted wire.

[0074] It is also conceivable that the first strand 40 and the second strand 42, which have a first winding portion 54 or a second winding portion 56, are received in a manner similar to... Figure 2 In the common winding portion 52. In this way, a double structure is created, in which the heating conductor 28 exists as a triple twisted thread.

[0075] The textile yarns 50 used to form the first winding portion 54 and the second winding portion 56 may be the same or different from each other. In addition, the textile yarns 50 used to form the common winding portion 52 may be different from or the same as the textile yarns 50 used to form the first winding portion 54 and / or the second winding portion 56.

[0076] Figure 4 A third embodiment of the heating conductor 28 is shown, in which the first strand 40 and the second strand 42 are similar to those according to [the following text is incomplete and requires further context to translate accurately] Figure 2The first implementation design.

[0077] In addition, a first tensile yarn 58 is additionally provided, which is twisted with the first strand 40 and the second strand 42. By the type of the first tensile yarn 58, the textile characteristics of the heating conductor 28 can be more specifically set, and in particular, the textile characteristics can be further adapted to the characteristics of the remaining warp yarns used in the seat belt webbing body 26.

[0078] The twisted yarn, composed of the first strand 40, the second strand 42, and the first tensile yarn 58, is received in a common winding portion 52, which is configured similarly to that in the first embodiment. Therefore, the heating conductor 28 in the third embodiment exists as a triple-twisted yarn.

[0079] Alternatively, within the common winding portion 52, the first strand 40, the second strand 42, and the first tensile yarn 58 may exist untwisted or only selected components of the heated conductor 28 may be twisted together, for example, only the first strand 40 and the first tensile yarn 58 may be twisted together.

[0080] The first tensile yarn 58 may be made of the same material as the textile yarn 50 or a different material. However, the first tensile yarn 58 is similar to the textile yarn 50 in that it is non-conductive and, in particular, includes characteristics that are closer to those of the remaining warp yarns used in the seatbelt webbing body 26 than those of the first strand 40 and the second strand 42 originally were.

[0081] exist Figure 5 The diagram shows a fourth embodiment of the heating conductor 28, in which the first strand 40 and the second strand 42 are similar to... Figure 3 The second implementation method is designed.

[0082] In addition, the heating conductor 28 is similar to Figure 4 The third embodiment includes a first tensile yarn 58, which is twisted with a first strand 40 and a second strand 42 and their respective winding portions, that is, the first winding portion 54 or the second winding portion 56.

[0083] Correspondingly, the heating conductor 28 is also constructed as a triple-twisted wire in this embodiment.

[0084] The first tensile yarn 58 may be made of the same yarn as the yarn also used in the first winding portion 54 and / or the second winding portion 56, or may be different from that yarn.

[0085] In addition, in the fourth embodiment, a common winding portion 52 may also be provided, in which the first winding strand 40, the second winding strand 42, and the first tensile yarn 58 are received.

[0086] Figure 6 yes Figure 3 Detailed illustrations of the second embodiment.

[0087] Here, not only the first strand 40 but also the second strand 42 includes a plurality of individual heating wires 60, which are received in the first winding portion 54 or the second winding portion 56 by the textile yarn 50.

[0088] The structure is shown Figure 6 Details of AA Figure 7 This will be further clarified in the text.

[0089] Each of the heating wires 60 is conductive and has an electrical insulation portion 44 on the circumferential side, as previously described for the first wire 40 and the second wire 42, that is, in particular, a varnish coating.

[0090] The heating wire 60 is connected to the power source 24 at the first contact 30 or the second contact 32, and thus an electrical connection is established between the power source 24 and the corresponding strands 40 or 42 of the heating wire 60.

[0091] The heating wire 60 is made of, for example, carbon fiber, silver fiber or metal monofilament.

[0092] The heating wires 60 can be twisted together, or only individual heating wires of the heating wires 60 can be twisted together.

[0093] In the illustrated embodiment, five heating wires 60 are used for each strand. Of course, there may be fewer or more than five heating wires 60 for each strand.

[0094] Similar to Figure 3 In the second embodiment, the first strand 40 and the second strand 42 are twisted together.

[0095] As previously explained, the first strand 40 and the second strand 42 can also be additionally received in a common winding portion 52.

[0096] Figure 8 With the help of similar Figure 7 The detailed display shows a variation of this embodiment.

[0097] In the variant, the first strand 40 and the second strand 42 respectively additionally include a second tensile yarn 62, which is processed into the corresponding first winding portion 54 or second winding portion 56 and thus works in conjunction with the heating wire 60.

[0098] In other words, unlike the first tensile yarn 58 used in the third and fourth embodiments, the second tensile yarn 62 is respectively configured for individual strands in the strands 40 and 42 and is a component of the corresponding strands 40 or 42.

[0099] The second tensile yarn 62 may be implemented similarly to or different from the first tensile yarn 58. In particular, the thickness of the second tensile yarn 62 corresponds to the thickness of the heating wire 60.

[0100] Figure 9 The heating conductor 28 shown can be understood as Figure 5 and Figure 6 The fifth embodiment is a combination of the implementation methods.

[0101] Therefore, in the fifth embodiment, the first wire 40 and the second wire 42 are respectively similar to Figure 6 The fifth embodiment is achieved by multiple wound heating wires 60.

[0102] Furthermore, a first tensile-resistant yarn 58 is present, which is twisted together with a wound first strand 40 and a wound second strand 42. Therefore, the heating conductor 28 is a triple-twisted yarn according to the sixth embodiment.

[0103] Similar to according to Figure 8 Alternatively, in the fifth embodiment, a second tensile yarn 62 may be additionally provided in the first strand 40 and / or the second strand 42.

[0104] As previously explained, the wound strand 40, the wound strand 42, and the first tensile yarn 58 may also be additionally received in a common winding portion 52.

[0105] Figure 10 A sixth embodiment of the seat belt webbing 12 is shown, basically showing only the heating area 36 of the seat belt webbing 12.

[0106] In the sixth embodiment, the seat belt webbing 12 includes a plurality of heating conductors 28 that extend substantially parallel to the longitudinal extension direction L of the seat belt webbing body 26.

[0107] Each of the heating conductors 28 is connected to the energy source 24 via its respective first contact 30 and second contact 32 in a manner similar to that of the heating conductor 24. Figure 1 Grounding connection.

[0108] The heating conductors 28 are distributed along the width extension direction B of the seat belt webbing body 26, which is perpendicular to the longitudinal extension direction L. The heating conductors 28 are arranged symmetrically with a mirror surface S, which is centered along the width extension direction B and extends parallel to the longitudinal extension direction L.

[0109] In this way, particularly uniform heating of the seat belt webbing body 26 can be achieved by operating multiple uniformly arranged heating conductors 28 simultaneously.

[0110] It goes without saying that the heating conductor 28 can also be used in... Figure 10 The different arrangements shown are as follows. For example, adjacent heating conductors 28 may each have the same distance from each other. There may also be more or fewer than four heating conductors 28.

[0111] As is clear from the previously described embodiments of seat belt webbing 12 with different heating conductors 28, the heating conductors 28 and therefore the seat belt webbing 12 according to the invention and the seat belt system 10 according to the invention can be designed and adapted in a variety of ways.

[0112] The selection of whether to set up and what type of winding portion to set up, namely the common winding portion 52, the first winding portion 54 and / or the second winding portion 56, and whether to use the first tensile yarn 58 and / or the second tensile yarn 62, is particularly aimed at achieving an optimized trade-off between the complexity of manufacturing the heating conductor 28 and the seat belt webbing body 26 and the textile characteristics of the heating conductor 28 for the intended use of the seat belt webbing 12.

[0113] Meanwhile, the installation of the corresponding heating conductor 28 is particularly simple, because only the electrical contact part needs to be set at the end of the seat belt webbing 12, and the size of the heating area 36 can be flexibly designed by selecting the position of the strand contact connection point 34.

Claims

1. A seatbelt webbing (12) for a seatbelt system (10) of a vehicle, the seatbelt webbing having a seatbelt webbing body (26) woven from warp and weft yarns and including at least one heating conductor (28), the heating conductor being constructed as warp yarns and comprising a first strand (40) and a second strand (42), the first strand and the second strand each having an electrical insulating portion (44) that electrically insulates the first strand (40) and the second strand (42) from each other. At the first end (46) of the heating conductor (28), the first wire (40) can be connected through the first contact (30) electrical contact and the second wire (42) can be connected through the second contact (32) electrical contact, and There is a strand contact connection point (34) at the second end (48) opposite to the first end (46) of the heating conductor (28), at which the first strand (40) and the second strand (42) are connected by electrical contact.

2. The seat belt webbing (12) according to claim 1, wherein, The first strand (40) and the second strand (42) are twisted together.

3. The seat belt webbing (12) according to claim 1 or 2, wherein, The first strand (40) and the second strand (42) are wound with textile yarn (50).

4. The seat belt webbing (12) according to claim 3, wherein, The first strand (40) and the second strand (42) are wound together once or twice with the textile yarn (50).

5. The seat belt webbing (12) according to claim 3 or 4, wherein, The first strand (40) and the second strand (42) are wound together and / or independently of each other with the textile yarn (50).

6. The seat belt webbing (12) according to any one of the preceding claims, wherein, The heating conductor (28) also includes a first tensile yarn (58), and in particular, the first tensile yarn (58), the first strand (40), and the second strand (42) are twisted together.

7. The seat belt webbing (12) according to any one of the preceding claims, wherein, The first strand (40) and / or the second strand (42) include a plurality of heating wires (60), in particular, the heating wires (60) are twisted together.

8. The seat belt webbing (12) according to claim 7, wherein, The first strand (40) and / or the second strand (42) include a second tensile yarn (62), in particular, the second tensile yarn (62) is twisted with the heating wire (60) of the first strand (40) or the second strand (42).

9. The seat belt webbing (12) according to any one of the preceding claims, wherein, The seatbelt webbing (12) contains two or more heating conductors (28).

10. A seat belt system (10) for a vehicle, the seat belt system having a seat belt webbing (12) according to any one of the preceding claims and an energy source (24), the energy source being connected to a first contact (30) and a second contact (32) of the heating conductor (28).

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