Belt strap with a heat conductor and safety belt system for a vehicle

Abstract

A belt strap (12) for a safety belt system (10) of a vehicle has a belt strap body (26), wherein the belt strap body (26) contains at least one heat conductor (28) which comprises a first strand and a second strand, each of which has an electrical insulation which insulates the first strand and the second strand from one another. At a first end of the heat conductor (28), the first strand can be electrically contacted by means of a first contacting point (30) and the second strand can be electrically contacted by means of a second contacting point (32). At a second end of the heat conductor (28) opposite the first end, a strand contacting point (34) is provided at which the first strand and the second strand are electrically contacted. The invention also relates to a safety belt system (10).

Description

[0001] Belt webbing with a heating conductor and safety belt system for a vehicle

[0002] The invention relates to a belt webbing for a safety belt system of a vehicle, which contains at least one heating conductor, and to a safety belt system for a vehicle with such a belt webbing.

[0003] Seat belt systems are designed to secure a vehicle occupant to a vehicle seat in such a way that, during heavy deceleration of the vehicle, the vehicle occupant is decelerated as evenly as possible and contact with other objects in the vehicle, such as a steering wheel or dashboard, is prevented.

[0004] In addition to this safety aspect, there are efforts to integrate comfort functions into the belt strap, such as a heating function.

[0005] From DE 10 2020 125 367 A1 it is known to provide a webbing with a woven webbing body having warp threads running in the longitudinal direction and weft threads running transversely to the warp threads, wherein at least one heating conductor is provided which is woven into the webbing body as a warp thread and / or a weft thread. The heating conductor is led out of the webbing at the opposite ends of the webbing in order to be electrically contacted with an energy source. If only a portion of the webbing is to be heated, a separation point must be provided in the webbing at which the heating conductor is severed so that the part of the heating conductor that is separated from the energy source by the separation point can no longer be heated. Alternatively, the heating conductor can be led out of the webbing at the separation point and provided with insulation or a cover, for example a cover made of rubber.Such solutions involve a high level of design effort, which makes the assembly of the webbing complicated.

[0006] The object of the invention is to provide a heatable belt webbing and a safety belt system with such a belt webbing, which is easy to manufacture and in particular enables precise heating of the belt webbing.

[0007] The object of the invention is achieved by a belt webbing for a safety belt system of a vehicle with a belt webbing body, wherein the belt webbing body is woven from warp and weft threads and contains at least one heating conductor which is designed as a warp thread and which comprises a first strand and a second strand, each of which has electrical insulation which electrically insulates the first strand and the second strand from one another. At a first end of the heating conductor, the first strand can be electrically contacted via a first contact point and the second strand can be electrically contacted via a second contact point. At a second end of the heating conductor opposite the first end, there is a strand contact point at which the first strand and the second strand are electrically contacted.

[0008] The invention is based on the fundamental idea that all of the at least two electrically heatable strands of the heating conductor can be electrically contacted at the same end of the heating conductor, thereby reducing the effort required to create the contacts between the individual conductors and making them more robust. At the same time, the electrical circuit that is intended to run through the strands when the webbing is in the installed position is closed by the strand contact point. The heatable area of ​​the webbing can be flexibly and precisely defined in a simple manner by selecting the position of the strand contact point and, in particular, by selecting the length of the strands between the first contact point and the strand contact point, or between the second contact point and the strand contact point.

[0009] A stranded wire is defined here as an electrical conductor consisting of a plurality of (at least two) individual wires that form a common conductor. The individual wires may run parallel, but are usually twisted or braided.

[0010] The electrical insulation of the first and second strands ensures that an electrical connection exists between the first and second strands only at the strand contact point. This ensures that a current flowing through the heating conductor must flow completely through the first and second strands, allowing the heating area of ​​the webbing defined by the strand contact point to be reliably heated during operation.

[0011] To ensure high durability while also taking into account unwanted environmental influences, all individual wires of the first and second strands are electrically insulated from each other. This is advantageously achieved by varnish insulation.

[0012] Each of the individual wires of the stranded conductors is advantageously provided with a surrounding insulation. This electrical insulation is, in particular, a lacquer coating applied to the respective individual wire. In addition, the entire stranded conductor can also be provided with insulation, in particular with lacquer insulation.

[0013] The stranded wire contact point can be created using any method that enables reliable electrical contact between the first stranded wire and the second stranded wire. For example, the stranded wire contact point is created by crimping, soldering, or laser welding. It is particularly advantageous here that the contact is made in a very small space, meaning that no large gap between two individual conductors needs to be bridged, and no electrically conductive bridge is required.

[0014] This also reduces the design and manufacturing effort required to insulate the stranded wire contact point. It becomes smaller overall, meaning the spatial extent of the respective contact point is significantly reduced.

[0015] The first strand and the second strand can be twisted together. This increases the mechanical stability of the heating conductor and simplifies the incorporation of the heating conductor into the webbing body. The electrical insulation of the first strand and the second strand prevents unwanted electrical contact between the first and second strands along the length of the heating conductor, despite the twisted strands. Thus, the electrical contact between the first and second strands continues to be established only via the strand contact point.

[0016] To further simplify the integration of the heating conductor into the webbing body, for example, by weaving, the first and second strands can be wrapped with a textile yarn. The wrapped strands thus represent a single yarn that can be woven together like normal warp threads to produce the webbing. Furthermore, the choice of textile yarn allows the color of the heating conductor to be matched to the other warp and weft threads of the webbing or to be deliberately contrasted with them.

[0017] A “textile yarn” is understood here and below to mean a yarn that is not an electrically conductive wire or strand.

[0018] For example, the textile yarn is a synthetic yarn made of polyester or polyamide. This can be available in a count between 100 and 350 dtex.

[0019] The first strand and the second strand can also be twisted together. Additionally, a wrapping with the textile yarn can be provided.

[0020] Preferably, the first strand and / or the second strand are wrapped with the textile yarn once or twice. This effectively provides the heating conductor with the desired textile character.

[0021] The textile yarn wrapping can have twists in the S-direction or the Z-direction. If the first strand and the second strand are wrapped twice with the textile yarn, the two wrappings preferably have a combination of twists in the S-direction and the Z-direction. In other words, the textile yarn of the first wrapping preferably has twists in the S-direction and the textile yarn of the second wrapping has twists in the Z-direction, or vice versa.

[0022] The first strand and the second strand can be wound with the textile yarn together and / or independently of each other. Accordingly, a double structure is also possible, in which the first strand and the second strand are each individually wound with a textile yarn, and the wound strands are wound with another textile yarn, thus providing an additional, higher-level, common winding. Both the individual winding and the higher-level, common winding can be implemented independently of each other, either single or double, as described above.

[0023] To further increase the tensile strength of the heating conductor, the heating conductor may further comprise a first strain relief yarn. In particular, the first strain relief yarn, the first strand, and the second strand are twisted together.

[0024] If a textile yarn is used to wind the first strand and the second strand, in this embodiment the entirety of the first strand, the second strand and the strain relief yarn is wound.

[0025] The heating power of the webbing can be further increased by having the first strand and / or the second strand comprise a plurality of heating wires, wherein the heating wires are, in particular, twisted together. This increases the current flow through the webbing, especially through the heating conductor. At the same time, even if one or more of the heating wires break, the webbing can continue to be heated via the remaining intact heating wires.

[0026] The heating wires are also provided with electrical insulation to prevent unwanted electrical contact between the heating wires. In particular, the electrical insulation of the respective stranded wire can be formed by the electrical insulation of the heating wires.

[0027] Furthermore, the first strand and / or the second strand can comprise a second strain-relief yarn, in particular wherein the second strain-relief yarn is twisted with the heating wires of the first strand and the second strand, respectively. In this way, the tensile strength and weavability of the heating conductor can be further increased or improved.

[0028] The second strain relief yarn differs from the first strain relief yarn in that the second strain relief yarn is assigned to each individual strand of the heating conductor, while the first strain relief yarn is assigned to the heating conductor as such, i.e., to the first strand and the second strand. The second strain relief yarn is then thinner than the first strain relief yarn, corresponding to the diameter of the individual wires, so that the strain relief yarn counts match the diameters of the individual wires or the diameter of the strand. The diameters of the individual wires are, for example, between 0.025 and 0.075 mm, and the diameter of the strands is between 0.125 and 0.45 mm, for example, with five individual wires per strand. For double twisted yarns it is between 0.25mm-0.9mm and for triple twisted yarns with two strands and a strain relief yarn it is between 0.375-1.35mm.

[0029] To ensure the most even heating of the webbing, the webbing may contain two or more heating conductors. In particular, the two or more heating conductors are distributed symmetrically and / or evenly across the width of the webbing.

[0030] The object of the invention is further achieved by a safety belt system for a vehicle having a belt webbing as described above and an energy source which is electrically contacted with the first contact point and the second contact point of the heating conductor.

[0031] The features and properties of the belt webbing according to the invention apply accordingly to the safety belt system according to the invention and vice versa.

[0032] By connecting the energy source to the first contact point and the second contact point of the heating conductor, the energy source is electrically connected to the webbing. If the webbing has more than one heating conductor, the energy source is electrically connected to the first contact point and the second contact point of each of the heating conductors of the webbing.

[0033] Further features and characteristics of the invention will become apparent from the following description of exemplary embodiments, which are not intended to be limiting, and from the drawings, in which:

[0034] - Fig. 1 is a schematic representation of a safety belt system according to the invention with a belt strap according to the invention, - Fig. 2 is a heating conductor of a first embodiment of the belt strap from Fig. 1,

[0035] - Fig. 3 shows a heating conductor of a second embodiment of the belt strap from Fig. 1,

[0036] - Fig. 4 shows a heating conductor of a third embodiment of the belt strap from Fig. 1,

[0037] - Fig. 5 shows a heating conductor of a fourth embodiment of the belt strap from Fig. 1,

[0038] - Fig. 6 the heating conductor of the second embodiment of the belt strap from Fig. 1 ,

[0039] - Fig. 7 a detail AA from Fig. 6,

[0040] - Fig. 8 shows a modification of the second embodiment according to Figures 3 and 6 using a detail analogous to Fig. 7,

[0041] - Fig. 9 shows a heating conductor of a fifth embodiment of the belt strap from Fig. 1, and

[0042] - Fig. 10 a sixth embodiment of the belt strap from Fig. 1.

[0043] Fig. 1 shows schematically a safety belt system 10 according to the invention for a vehicle.

[0044] The safety belt system 10 has a belt webbing 12 according to the invention, an end fitting 14, a tongue 16, a belt buckle 18, a deflector 20, a belt retractor 22 and an energy source 24.

[0045] The energy source 24 here is an electrical energy source, for example a battery or an accumulator of the vehicle.

[0046] The belt webbing 12 is attached to the motor vehicle at a first end via the end fitting 14 and at a second end opposite the first end via the belt retractor 22. The belt webbing 12 can be coupled to the belt buckle 18 via the plug-in tongue 16 movably attached to the belt webbing 12. The belt webbing 12 comprises a belt webbing body 26 and a heating conductor 28 integrated into the belt webbing body 26. In particular, the heating conductor serves as a warp thread of the belt webbing body 26 and is incorporated into the fabric composed of other warp and weft threads of the belt webbing body 26.

[0047] In the area of ​​the end fitting 14, the heating conductor 28 is electrically connected to the energy source 24 via a first contact point 30 and a second contact point 32.

[0048] The heating conductor 28 extends over a portion of the webbing 12 to a stranded wire contact point 34, which will be discussed in more detail later. The portion of the webbing 12 through which the heating conductor 28 passes is a heating region 36 of the webbing 12.

[0049] In other words, the portion of the belt webbing 12 through which the heating conductor 28 passes can be heated electrically, so that a vehicle occupant 38 using the safety belt system 10 can be warmed directly by contact with the belt webbing 12.

[0050] Thus, the safety belt system 10 has an additional comfort function in addition to the conventional use for securing the vehicle occupant 38.

[0051] In the embodiment shown, the stranded wire contact point 34 is arranged such that the heating area 36 extends approximately into the shoulder area of ​​the vehicle occupant 38.

[0052] Basically, by choosing the location of the strand contact point 34 along the belt 12, it is possible to flexibly determine which part of the belt 12 is to serve as the heating area 36.

[0053] It is thus also possible for the heating region 36 to extend over almost the entire webbing 12 or the entire webbing 12 by attaching the strand contact point 34 correspondingly close to the second end or at the second end of the webbing 12.

[0054] Fig. 2 schematically illustrates the heating conductor 28 of a first embodiment of the belt webbing 12, with the length of the heating conductor 28 shown greatly abbreviated for clarity. The heating conductor 28 comprises a first stranded wire 40 and a second stranded wire 42, which are electrically conductive.

[0055] For example, the first strand 40 and the second strand 42 consist of carbon fibers, silver threads or metallic individual wires.

[0056] The first strand 40 and the second strand 42 each have an electrical insulation 44 that circumferentially covers the first strand 40 and the second strand 42, respectively. Thus, no electrical contact can be established between the first strand 40 and the second strand 42 by simply placing or twisting the first strand 40 and the second strand 42 together.

[0057] The electrical insulation 44 consists, for example, of an electrically insulating varnish.

[0058] At a first end 46 of the heating conductor 28, the first stranded wire 40 has the first contact point 30, and the second stranded wire 42 has the second contact point 32, with which the heating conductor 28 is electrically connected to the energy source 24 (see Fig. 1). Accordingly, in the embodiment shown, the first stranded wire 40 is assigned to the positive pole of the energy source 24, and the second stranded wire 42 is assigned to the negative pole of the energy source 24.

[0059] The connection between the respective contact point 30 or 32 and the energy source 24 can be made via a solder connection.

[0060] A second end 48 of the heating conductor 28 is formed via the stranded wire contact point 34, at which the first stranded wire 40 and the second stranded wire 42 are electrically contacted. Accordingly, the heating conductor 28 creates a current path through the webbing 12, leading from the first contact point 30 to the stranded wire contact point 34 and from the stranded wire contact point 34 to the second contact point 32. When the current path is subjected to a current flow from the energy source 24, the heating conductor 28 heats up, so that the webbing body 26 heats up in the heating region 36, starting from the heating conductor 28.

[0061] The stranded wire contact point 34 can be created using any method that ensures sufficiently stable electrical contact between the first stranded wire 40 and the second stranded wire 42. For example, the stranded wire contact point 34 is a crimp, solder, or laser weld. In the first embodiment of the heating conductor 28, the first stranded wire 40 and the second stranded wire 42 are wound with a textile yarn 50, which thus forms a common winding 52 that encloses both the first stranded wire 40 and the second stranded wire 42.

[0062] Within the common winding 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 52 form a double twisted strand that serves as the heating conductor 28.

[0063] Basically, the first strand 40 and the second strand 42 can also run simply next to each other within the common winding 52, that is, without being twisted together.

[0064] The textile yarn 50 is made of an electrically non-conductive material. In particular, the textile yarn 50 is a yarn that corresponds to a yarn used outside the heating conductor 28 in the webbing body 26. In this way, the behavior of the heating conductor 28 is adapted to the mechanical behavior of the remaining components of the webbing body 26. This further simplifies the incorporation of the heating conductor 28 into the webbing body 26 and ensures the most uniform behavior of the webbing 12 across the entire webbing body 26.

[0065] For example, the textile yarn 50 is a polyester yarn.

[0066] In the embodiment shown in Fig. 2, the first strand 40 and the second strand 42 are wound once with the textile yarn 50. In principle, the first strand 40 and the second strand 42 can also be wound twice or more than twice with the textile yarn 50. In this case, the first strand 40 and the second strand 42 are preferably wound twice with the textile yarn 50, with one of the formed windings having twists in the S direction and the other of the formed windings having twists in the Z direction.

[0067] The thickness of the heating conductor 28 essentially corresponds to the thickness of the textile warp threads that are incorporated into the belt 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 textile warp threads. Further embodiments of the heating conductor 28 are shown schematically in Figs. 3 to 9, which are discussed in more detail below. The further embodiments are essentially identical to one another, so that only the differences between the embodiments are highlighted, and the features and properties of individual embodiments apply analogously to the other embodiments, unless otherwise stated. The same reference symbols identify identical or functionally equivalent components.

[0068] In Fig. 3, a second embodiment of the heating conductor 28 is shown, in which the first strand 40 and the second strand 42 are each wound independently of one another with a textile yarn 50, so that the first strand 40 is received in a first winding 54 and the second strand 42 is received in a second winding 56.

[0069] The first strand 40 and the second strand 42 are twisted together with their associated winding, i.e. the first winding 54 and the second winding 56, respectively, so that the heating conductor 28 is again designed as a double twist.

[0070] It is also conceivable that the first strand 40 and the second strand 42, provided with the first winding 54 and the second winding 56, respectively, are again accommodated in a common winding 52 analogous to Fig. 2. In this way, a double structure would be created in which the heating conductor 28 is present as a triple twist.

[0071] The textile yarn 50 used to form the first wrap 54 and the second wrap 56 can be the same or different from each other. Furthermore, the textile yarn 50 used to form the common wrap 52 can be different from or the same as the textile yarn 50 used to form the first wrap 54 and / or the second wrap 56.

[0072] Fig. 4 shows a third embodiment of the heating conductor 28, in which the first strand 40 and the second strand 42 are configured analogously to the first embodiment according to Fig. 2. Furthermore, a first strain relief yarn 58 is additionally provided, which is twisted with the first strand 40 and the second strand 42. The type of the first strain relief yarn 58 allows the textile character of the heating conductor 28 to be adjusted even more precisely, in particular, to be more closely adapted to the behavior of the other warp threads used in the webbing body 26.

[0073] The twisted yarn comprising the first strand 40, the second strand 42, and the first strain-relief yarn 58 is again accommodated in a common winding 52, which is designed analogously to the first embodiment. Thus, the heating conductor 28 of the third embodiment is a triple twisted yarn.

[0074] It is also possible that within the common winding 52 the first strand 40, the second strand 42 and the first strain relief yarn 58 are untwisted or that only selected components of the heating conductor 28 are twisted together, for example only the first strand 40 and the first strain relief yarn 58.

[0075] The first strain relief yarn 58 can be made of the same material as the textile yarn 50 or can be different from it. However, like the textile yarn 50, the first strain relief yarn 58 is not electrically conductive and, in particular, has properties that are closer to the properties of the other warp threads used in the webbing body 26 than is otherwise the case for the first strand 40 and the second strand 42.

[0076] Fig. 5 shows a fourth embodiment of the heating conductor 28, in which the first strand 40 and the second strand 42 are designed analogously to the second embodiment of Fig. 3.

[0077] Furthermore, analogously to the third embodiment of Fig. 4, the heating conductor 28 has the first strain relief yarn 58, which is twisted with the first strand 40 and the second strand 42 and the respective associated winding, i.e. the first winding 54 and the second winding 56, respectively.

[0078] Accordingly, the heating conductor 28 is also formed as a triple-twisted yarn in this embodiment. The first strain relief yarn 58 can be made of the same yarn used for the first winding 54 and / or the second winding 56, or it can be different from it.

[0079] Furthermore, in the fourth embodiment, a common winding 52 can also be provided, in which the wound first strand 40, the wound second strand 42 and the first strain relief yarn 58 are accommodated.

[0080] Fig. 6 is a detailed illustration of the second embodiment of Fig. 3.

[0081] Here, both the first strand 40 and the second strand 42 comprise a plurality of individual heating wires 60, which are accommodated via a textile yarn 50 in the first winding 54 and the second winding 56, respectively.

[0082] This structure is further illustrated in Fig. 7, which shows detail AA from Fig. 6.

[0083] Each of the heating wires 60 is electrically conductive and provided on its circumference with an electrical insulation 44 as previously described for the first strand 40 and the second strand 42, that is to say in particular with a lacquer coating.

[0084] The heating wires 60 are electrically contacted with the energy source 24 at the first contact point 30 or at the second contact point 32 and thus establish the electrical connection between the energy source 24 and the respective stranded wire 40 or 42 to which the heating wires 60 are assigned.

[0085] The heating wires 60 consist, for example, of carbon fibers, silver fibers or individual metallic wires.

[0086] The heating wires 60 can be twisted together, although only individual ones of the heating wires 60 can be twisted.

[0087] In the embodiment shown, five heating wires 60 are used per strand. It is understood that fewer than five or more than five heating wires 60 per strand can also be present.

[0088] The wound first strand 40 and the wound second strand 42 are in turn twisted together, analogously to the second embodiment of Fig. 3. It is also possible that the wound first strand 40 and the wound second strand 42 are additionally accommodated in a common winding 52, as previously described.

[0089] Fig. 8 shows a modification of this embodiment by depicting a detail analogous to Fig. 7.

[0090] In the modification, the first strand 40 and the second strand 42 each additionally have a second strain relief yarn 62, which is incorporated into the respective first winding 54 or the second winding 56 and thus interacts with the heating wires 60.

[0091] In other words, in contrast to the first strain relief yarn 58 used in the third and fourth embodiments, the second strain relief yarn 62 is assigned to a single one of the strands 40 and 42 and is a component of the corresponding strand 40 or 42.

[0092] The second strain relief yarn 62 can be designed analogously to the first strain relief yarn 58 or can be different from it. In particular, the thickness of the second strain relief yarn 62 corresponds to the thickness of the heating wires 60.

[0093] Fig. 9 shows a fifth embodiment of the heating conductor 28, which can be understood as a combination of the embodiments from Fig. 5 and Fig. 6.

[0094] Accordingly, in the fifth embodiment, the first strand 40 and the second strand 42 are each realized via a plurality of wound heating wires 60, analogous to the fifth embodiment in Fig. 6.

[0095] Furthermore, the first strain relief yarn 58 is present, which is twisted with the wound first strand 40 and the wound second strand 42. The heating conductor 28 according to the sixth embodiment is thus a triple twisted yarn.

[0096] Analogous to the alternative according to Fig. 8, in the fifth embodiment, the second strain relief yarn 62 can also be additionally provided in the first strand 40 and / or in the second strand 42. The wound strand 40, the wound strand 42, and the first strain relief yarn 58 can also be additionally incorporated into a common winding 52, as previously described.

[0097] Fig. 10 shows a sixth embodiment of the belt strap 12, wherein essentially only the heating region 36 of the belt strap 12 is shown.

[0098] In the sixth embodiment, the belt webbing 12 has a plurality of heating conductors 28 which run substantially parallel to a longitudinal extension direction L of the belt webbing body 26.

[0099] Each of the heating conductors 28 is electrically connected to the energy source 24 via the associated first contact point 30 and second contact point 32, analogous to Fig. 1.

[0100] The heating conductors 28 are arranged distributed along a width direction B of the belt body 26, which runs perpendicular to the longitudinal direction L, wherein the heating conductors 28 are arranged mirror-symmetrically about a mirror plane S, which runs centrally along the width direction B and parallel to the longitudinal direction L.

[0101] In this way, a particularly uniform heating of the belt body 26 is made possible by simultaneous operation of the plurality of uniformly arranged heating conductors 28.

[0102] Of course, the heating conductors 28 can also be arranged differently than shown in Fig. 10. For example, adjacent heating conductors 28 can each be spaced the same distance apart. More or fewer than four heating conductors 28 can also be present.

[0103] Based on the previously described embodiments of the belt webbing 12 with different heating conductors 28, it becomes clear that the heating conductor 28 and thus the belt webbing 12 according to the invention as well as the safety belt system 10 according to the invention can be designed and adapted in a variety of ways.

[0104] The choice of whether and which type of winding, i.e. a common

[0105] The choice of whether the first winding 52, the first winding 54 and / or the second winding 56 should be present, and whether the first strain relief yarn 58 and / or the second strain relief yarn 62 is used or not, depends in particular on achieving an optimal compromise for the intended application of the webbing 12 between the complexity in the manufacture of the heating conductor 28 and the webbing body 26 and the textile behavior of the heating conductor 28.

[0106] At the same time, the installation of the respective heating conductor 28 is particularly simple, since electrical contact only needs to be provided at one end of the belt 12, while the size of the heating area 36 can be designed flexibly by selecting the position of the stranded wire contact point 34.

Claims

Patent claims 1. Belt webbing (12) for a safety belt system (10) of a vehicle, comprising a belt webbing body (26), wherein the belt webbing body (26) is woven from warp and weft threads and contains at least one heating conductor (28) which is designed as a warp thread and which comprises a first strand (40) and a second strand (42), each having an electrical insulation (44) which electrically insulates the first strand (40) and the second strand (42) from one another, wherein at a first end (46) of the heating conductor (28), the first strand (40) can be electrically contacted via a first contact point (30) and the second strand (42) can be electrically contacted via a second contact point (32), and wherein at a second end (48) of the heating conductor (28) opposite the first end (46), a strand contact point (34) is provided, at which the first strand (40) and the second strand (42) are electrically contacted.

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

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

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

5. 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 one another with the textile yarn (50).

6. Webbing (12) according to one of the preceding claims, wherein the heating conductor (28) further comprises a first strain relief yarn (58), in particular wherein the first strain relief yarn (58), the first strand (40) and the second strand (42) are twisted together.

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

8. Webbing (12) according to claim 7, wherein the first strand (40) and / or the second strand (42) comprise a second strain relief yarn (62), in particular wherein the second strain relief yarn (62) is twisted with the heating wires (60) of the first strand (40) or the second strand (42).

9. Webbing (12) according to one of the preceding claims, wherein the Belt strap (12) contains two or more of the heating conductors (28).

10. Safety belt system (10) for a vehicle, comprising a belt webbing (12) according to one of the preceding claims and an energy source (24) which is electrically contacted with the first contact point (30) and the second contact point (32) of the heating conductor (28).

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