Multi-layered motor vehicle tube line

Abstract

Multi-layered motor vehicle pipe line for passing at least one fluid medium, the pipe line comprising a fluid passage and a pipe wall portion surrounding the fluid passage, wherein the pipe wall portion has a five-layer structure, the five-layer structure being arranged in the following order from the outside to the inside: an outer layer comprising a polyamide; an outer-adjacent layer comprising a polyamide; an adhesion promoter layer; an inner-adjacent layer comprising at least one thermoplastic elastomer; and a barrier layer. The barrier layer is arranged radially inside the inner-adjacent layer and directly adjacent to the inner-adjacent layer, forms the radially innermost layer of the pipe wall portion, and is in direct contact with the at least one fluid medium in the fluid passage, and wherein the multi-layered pipe line is at least partially configured as a corrugated pipe.

Description

[0001] This application is a divisional application of the invention patent application filed on March 5, 2021, with application number 202110244177.6 and invention title "Multi-layered Motor Vehicle Tubular Circuit". Technical Field

[0002] This invention relates to a multi-layered automotive tubular circuit for passing through at least one fluid medium, wherein the tubular circuit has a fluid channel and a wall portion surrounding the fluid channel, wherein the wall portion is constructed in multiple layers and has at least three layers. The tubular circuit according to the invention is preferably used as a temperature-regulating tubular circuit in a motor vehicle's temperature-regulating circuit. Here, a fluid temperature-regulating medium, such as a liquid or gaseous temperature-regulating medium, is guided through the tubular circuit. Therefore, the tubular circuit according to the invention is preferably a temperature-regulating tubular circuit. A particularly preferred embodiment of the automotive tubular circuit according to the invention is characterized in that the tubular circuit is used as a cooling tubular circuit in a motor vehicle's temperature-regulating circuit or cooling circuit. If the tubular circuit is used as a cooling tubular circuit, the cooling medium of the motor vehicle's cooling circuit—particularly a liquid cooling medium—is guided through this cooling tubular circuit. The multi-layered tubular circuit according to the invention can, for example, be used as a temperature-regulating tubular circuit or a cooling tubular circuit in a motor vehicle's air conditioning system. Furthermore, the tubular circuit is used in the temperature-regulating circuit of electric vehicles or hybrid vehicles, and therein is preferably used for temperature regulation or cooling of the battery system. Background Technology

[0003] Multi-layered automotive tubular circuits and temperature-regulating or cooling tubular circuits are known in practice, in principle, in various implementations. It is also known to use such multi-layered tubular circuits in automotive temperature control circuits. However, it has been shown that the tubular circuits known to date have a number of drawbacks. Tubular circuits generally require improvement in terms of their barrier properties and / or their mechanical stability or resistance. If a trade-off must be struck between sufficient barrier properties and high mechanical stability in a tubular circuit, it is usually only feasible through high manufacturing costs or high material costs. Furthermore, temperature-regulating tubular circuits must meet different requirements in different temperature control circuits, such as in automotive air conditioning systems or in the temperature control systems of hybrid or electric vehicles. This results in the necessity of using different tubular circuits for different application areas in practice—requires improvement in this regard. Summary of the Invention

[0004] In contrast, the present invention addresses the following technical problem: proposing a vehicle tubular circuit of the type described above, which meets all requirements in terms of its barrier properties and mechanical stability, can still be manufactured at a low manufacturing cost, and can be used quasi-generally or flexibly in temperature control circuits, such as in the coolant circuits of motor vehicles.

[0005] To address the aforementioned technical problem, the present invention teaches a multi-layered automotive tubular circuit for passing through at least one fluid medium, wherein the tubular circuit has a fluid channel and a wall portion surrounding the fluid channel, wherein the wall portion is constructed in multiple layers and has at least three layers, more specifically having a layer structure from the outside in as follows: - The outer layer is composed of at least one polyamide, particularly at least one aliphatic polyamide. - Adhesive layer - An inner layer composed of at least one thermoplastic elastomer, The total layer thickness d of the tube wall portion is 0.3 to 3.0 mm, preferably 0.5 to 2.5 mm, and more preferably 0.75 to 2.0 mm.

[0006] This invention relates to multi-layered automotive tubular wiring or its application in automotive vehicles as temperature-regulating tubular wiring. Here, a fluid temperature-regulating medium, particularly a liquid temperature-regulating medium, and preferably a liquid cooling medium, is guided through the tubular wiring. The automotive tubular wiring according to the invention can be used as a temperature-regulating tubular wiring, particularly as a cooling tubular wiring, in the temperature-regulating or cooling circuit of an automotive vehicle. Therefore, the multi-layered automotive tubular wiring according to the invention is preferably a temperature-regulating tubular wiring, and especially a cooling tubular wiring. According to a recommended embodiment of the invention, the tubular wiring according to the invention is used in a temperature-regulating circuit for temperature regulation or cooling of the battery system of an electric vehicle or hybrid vehicle. Also within the scope of the invention is the use of the tubular wiring according to the invention as a temperature-regulating or cooling tubular wiring in the air conditioning system of an automotive vehicle. An alcohol-water mixture, preferably an ethylene glycol-water mixture, is recommended as the temperature-regulating or cooling medium. However, other temperature-regulating or cooling media may also be used within the scope of the invention.

[0007] This invention is based on the knowledge that the multi-layered automotive tubular wiring according to the invention meets all requirements in terms of its barrier properties and mechanical stability, and can be manufactured with low manufacturing costs. Furthermore, the multi-layered automotive tubular wiring according to the invention, due to its advantageous characteristics, can be flexibly or universally used as a temperature-regulating tubular wiring or cooling tubular wiring in the temperature-regulating or cooling circuits of motor vehicles. In this respect, a particular advantage of the tubular wiring according to the invention is that, due to its specific layered composite structure, it can be used not only in the temperature-regulating or cooling circuits of air conditioning systems, but also in the temperature-regulating or cooling circuits of battery systems for electric and / or hybrid vehicles.

[0008] In terms of solving technical problems, it has been proven that the total layer thickness d of the tube wall according to the invention is particularly suitable in the range of 0.3 to 3.0 mm, preferably 0.5 to 2.5 mm and more preferably 0.75 to 2.0 mm.

[0009] A highly preferred embodiment of the present invention is characterized in that the outer layer is composed of or substantially composed of at least one polyamide selected from "polyamide 6, polyamide 10, polyamide 11, polyamide 12", preferably composed of or substantially composed of polyamide 6. In addition to at least one polyamide, the outer layer may also contain additives. It is recommended that at least 90% by weight, preferably at least 93% by weight, and preferably at least 97% by weight of the outer layer be composed of at least one polyamide selected from the above, preferably polyamide 6.

[0010] According to the present invention, an inner layer is provided, which is composed of at least one thermoplastic elastomer. Within the scope of the invention, the thermoplastic elastomer is based on at least one component selected from "ethylene-propylene-diene rubber (EPDM), butyl rubber, chloroprene rubber, styrene-butadiene rubber, nitrile rubber, and nitrile-butadiene rubber". According to a particularly preferred embodiment, the thermoplastic elastomer is based on ethylene-propylene-diene rubber (EPDM). Within the scope of the invention, the inner layer is composed of or substantially composed of at least one thermoplastic elastomer. Suitably, at least 90% by weight, preferably at least 93% by weight, and preferably at least 97% by weight of the inner layer is composed of a thermoplastic elastomer. In addition to at least one thermoplastic elastomer, the inner layer may also contain additives.

[0011] EPDM has proven particularly suitable as a component of the thermoplastic elastomer for the inner layer of the tubular circuit according to the invention, and particularly contributes to the highly advantageous mechanical stability of the tubular circuit. According to one embodiment of the motor vehicle tubular circuit according to the invention, the inner layer is composed of or substantially composed of EPDM. Within the scope of the invention, the thermoplastic elastomer of the inner layer is an olefin-based thermoplastic elastomer (TPO). Suitably, within the scope of the invention, this TPO elastomer comprises EPDM and a polyolefin, preferably polypropylene. Within the scope of the invention, the thermoplastic elastomer of the inner layer is particularly preferably a thermoplastic vulcanizate (TPV). According to a recommended embodiment of the invention, a mixture or alloy of elastomer or rubber and polyolefin—particularly polypropylene—is thus used as the thermoplastic vulcanizate (TPV) for the inner layer. The elastomer or rubber is preferably EPDM.

[0012] According to the invention, an adhesion promoter layer is provided between the outermost layer and the innermost layer. A highly preferred embodiment of the invention is characterized in that the adhesion promoter layer is based on at least one polyolefin. More particularly preferably, the adhesion promoter layer is based on polypropylene. Suitably, the adhesion promoter layer is composed of polypropylene or substantially polypropylene. In addition to at least one polyolefin, preferably in addition to polypropylene, the adhesion promoter layer may contain additives. It is recommended that at least 90% by weight, preferably at least 93% by weight, preferably at least 96% by weight, and very preferably at least 98% by weight of the adhesion promoter layer is composed of polyolefin or polypropylene. Within the scope of the invention, the adhesion promoter layer particularly ensures that the layers surrounding it, such as the outermost and innermost layers, are functionally and reliably connected to each other, and avoids undesirable delamination of the composite structure when the tubular line is subjected to mechanical loads. Delamination can be avoided surprisingly simply and functionally reliably by means of the adhesion promoter layer according to the invention, and this is feasible, especially with low manufacturing costs and low expenses.

[0013] A particularly preferred embodiment of the invention is characterized in that the tubular circuit has an outer layer that is outwardly connected to an outermost layer. In this variant, it is therefore preferred that the outermost layer and the outermost layer are in contact. Outwardly refers to the direction toward the outside of the vehicle tubular circuit. Suitably, the outer layer is based on at least one polyamide, preferably based on at least one aliphatic polyamide, particularly preferably based on at least one of "polyamide 6.12, polyamide 6.6, polyamide 6.10, polyamide 6.16", and even more preferably based on polyamide 6.12. Within the scope of the invention, the outer layer is composed of or substantially composed of at least one polyamide, and preferably of or substantially composed of polyamide 6.12. The outer layer may also contain additives in addition to polyamide or polyamide 6.12. It is recommended that at least 90% by weight, preferably at least 93% by weight, preferably at least 96% by weight, and very preferably at least 98% by weight of the outer layer be composed of at least one polyamide or aliphatic polyamide selected from the above, and preferably of polyamide 6.12. Recommendation: The outer layer is the outermost terminating layer of the tubular circuit. However, in principle, within the scope of this invention, the tubular circuit according to the invention also has at least one outermost layer adjacent to the outer layer. According to a recommended embodiment, the thickness of the outer layer is 5% to 20%, preferably 10% to 15%, of the total layer thickness d of the tubular wall portion.

[0014] According to a highly preferred embodiment of the invention, the tubular circuit has at least one barrier layer. The barrier layer is preferably based on at least one thermoplastic polymer. Particularly preferred is that the barrier layer is based on at least one polyolefin, and particularly preferred is that it is based on polypropylene. Within the scope of the invention, the barrier layer is composed of or substantially composed of at least one polyolefin. Preferably, the barrier layer is composed of or substantially composed of polypropylene. In addition to polyolefins or polypropylene, the barrier layer may also contain additives. These can be conductive additives, such that the barrier layer is preferably electrically conductive. Suitablely, at least 90% by weight, preferably at least 93% by weight, preferably at least 96% by weight, and very preferably at least 98% by weight of the barrier layer is composed of at least one polypropylene, preferably a polyolefin. Polypropylene has proven to be particularly suitable as a material for at least one barrier layer, more precisely, particularly suitable in terms of its barrier properties. Furthermore, embodiments of the tubular circuit according to the invention having a barrier layer made of polypropylene are based on the knowledge that particularly advantageous barrier properties can be achieved through the interaction of at least one polypropylene barrier layer and an inner layer made of at least one thermoplastic elastomer—especially in conjunction with the remaining layers of the tubular circuit—and at the same time outstanding mechanical stability of the tubular circuit can be achieved.

[0015] Preferably, at least one barrier layer forms the inner layer of the tubular circuit, and this inner layer is preferably connected inwardly to the innermost layer. Here, "inwardly" means in the direction towards the inside of the vehicle tubular circuit or the fluid passage. Therefore, in this variant, the innermost layer and the barrier layer are preferably in contact. If the barrier layer forms the inner layer of the tubular circuit, then this inner layer is preferably the layer that terminates inwardly in the tubular circuit. However, within the scope of the invention, the innermost layer is disposed adjacent to the barrier layer or the inner layer in an inward direction.

[0016] According to an alternative embodiment of the invention, at least one barrier layer is disposed between the innermost layer and the outermost layer. In this embodiment, the innermost layer preferably forms the innermost terminating layer of the tubular circuit. However, it is also within the scope of the invention that the innermost layer of the tubular circuit is disposed adjacent to the innermost layer. More particularly preferably, in this embodiment, at least one barrier layer is disposed between the innermost layer and the outermost layer. In the scope of this particularly recommended embodiment, it is preferred that the barrier layer is adjacent to the innermost layer outward and, more particularly preferably, disposed between the innermost layer and the adsorbent layer.

[0017] According to a recommended embodiment of the invention, the thickness of the barrier layer is 10% to 60%, preferably 15% to 50%, of the total layer thickness d of the pipe wall portion. Suitably, the thickness of the outermost layer is 10% to 40%, preferably 10% to 20%, of the total layer thickness d of the pipe wall portion. Recommended: The thickness of the adsorbent layer is 2% to 15%, preferably 7% to 15%, of the total layer thickness d of the pipe wall portion. Within the scope of the invention, the thickness of the adsorbent layer is between 0.025 and 0.45 mm, preferably between 0.035 and 0.35 mm, particularly preferably between 0.04 and 0.3 mm, and even more preferably between 0.05 and 0.2 mm.

[0018] The recommended thickness of the inner layer is 5% to 20% of the total layer thickness d of the pipe wall, preferably 7% to 15%. Preferably, the thickness of the outer layer and / or the outer and / or inner layers and / or the barrier layer is between 0.05 and 1.5 mm, more preferably between 0.07 and 1.2 mm, particularly preferably between 0.1 and 0.8 mm, and even more preferably between 0.1 and 0.5 mm.

[0019] A highly preferred embodiment of the present invention is characterized in that the outer layer has a greater layer thickness than the adhesion promoter layer. Within the scope of the invention, the outer layer and / or the inner layer and / or the barrier layer have a greater layer thickness than the adhesion promoter layer.

[0020] Preferably, the barrier layer has a greater thickness than the inner layer.

[0021] According to a recommended embodiment of a motor vehicle tubular wiring harness, the inner layer or barrier layer is in direct contact with the fluid guided in the fluid channel. Therefore, suitably, the inner layer or barrier layer forms the inwardly terminating layer of the tubular wiring harness. Within the scope of the invention, the inwardly terminating layer of the tubular wiring harness has at least one conductive additive, such that the inwardly terminating layer of the tubular wiring harness is preferably electrically conductive.

[0022] Furthermore, within the scope of this invention is the manufacture of motor vehicle tubular circuits according to the invention by layer extrusion or co-extrusion.

[0023] According to a particularly preferred embodiment, the tubular circuit has at least five layers, preferably exactly five layers, and more precisely, has the following layer order from the outside in: an outer layer composed of polyamide, particularly polyamide 6.12 / an outer layer composed of polyamide, particularly polyamide 6 / an adhesion promoter layer composed particularly of polypropylene / an inner layer composed of at least one thermoplastic elastomer, particularly EPDM-based / a barrier layer composed particularly of polypropylene. According to an alternative embodiment, the barrier layer is disposed between the adhesion promoter layer and the inner layer, resulting in a five-layer structure having the following layer structure from the outside in: an outer layer composed of polyamide, particularly polyamide 6.12 / an outer layer composed of polyamide, particularly polyamide 6 / an adhesion promoter layer composed particularly of polypropylene / a barrier layer composed particularly of polypropylene / an inner layer composed of at least one thermoplastic elastomer, particularly EPDM-based. Also within the scope of the invention, in principle, is a motor vehicle tubular circuit having an innermost and an outermost layer, such that the motor vehicle tubular circuit has at least six or seven layers.

[0024] Within the scope of this invention, the motor vehicle tubular wiring is at least partially, preferably completely, constructed as a corrugated pipe. Here, corrugated pipe refers to a tubular wiring or its wall portion, particularly the outer surface of the tubular wiring or its wall portion, having crests and troughs that surround the circumference of the tubular wiring. Preferably, the crests and troughs of the tubular wiring have the same or substantially the same spacing from each other over at least a portion of the length of the tubular wiring, preferably over the entire length, or substantially over the entire length of the tubular wiring. Alternative embodiments are characterized in that the tubular wiring or its outer surface is at least partially, preferably completely, smooth or substantially smooth.

[0025] This invention is based on the knowledge that the multi-layered automotive tubular wiring according to the invention possesses outstanding characteristics not only in terms of its barrier properties but also in terms of its mechanical stability and resistance. Therefore, this tubular wiring meets all requirements regarding the barrier properties of the fluid guided in the fluid channel, particularly the temperature-regulating or cooling medium, and regarding mechanical stability. The tubular wiring or temperature-regulating tubular wiring is heat-resistant over a wide temperature range and does not delaminate even under strong mechanical loads. Furthermore, the tubular wiring according to the invention exhibits satisfactory thermal insulation. Moreover, due to its special layered structure, the tubular wiring according to the invention can be used quasi-generally or flexibly in the temperature-regulating or cooling circuits of motor vehicles. Therefore, the tubular wiring according to the invention can be used as a temperature-regulating or cooling tubular wiring in air conditioning systems, and is also suitable for use in the temperature-regulating circuits of electric and / or hybrid vehicles, especially for temperature regulation or cooling of battery systems. This flexibility of use of the automotive tubular wiring according to the invention is a significant advantage of the invention. Furthermore, the tubular wiring according to the invention can be manufactured with minimal manufacturing costs and thus low manufacturing expenses. Co-extrusion of layered composite structures is a preferred method for producing tubular lines, which is feasible, effective, and energy-efficient. Attached Figure Description

[0026] The invention will now be described in more detail with reference to the accompanying drawings, which illustrate only one embodiment. (Illustrated schematically:) Figure 1 A perspective view of a motor vehicle tubular circuit according to the present invention is shown, and Figure 2 Showing through according to Figure 1 A cross-sectional view of the object. Detailed Implementation

[0027] The accompanying drawings illustrate a multi-layered automotive tubular circuit 1 according to the present invention. In an embodiment according to the drawings, the tubular circuit 1 may be a temperature-regulating tubular circuit, particularly a cooling tubular circuit for a temperature-regulating or cooling circuit in an automotive vehicle. According to the invention, the tubular circuit 1 has a fluid channel 2 and a wall portion 3 surrounding the fluid channel 2. A fluid medium, particularly a temperature-regulating or cooling medium, not shown in more detail in the drawings, is guided through the tubular circuit 1 in the fluid channel 2. Preferably, and in this embodiment according to the drawings, the wall portion 3 is multi-layered and has five layers. These five layers, from the outside in, are an outer layer 7, an outermost layer 4, an adsorbent layer 5, an innermost layer 6, and a barrier layer 8. In this embodiment according to the drawings, the barrier layer 8 forms the inner layer of the tubular circuit 1, and preferably, in this embodiment, the inner layer is inwardly connected to the innermost layer 6. In an alternative embodiment according to the invention, not shown in the drawings, the barrier layer 8 follows the adsorbent layer 5 first, and then the innermost layer 6.

[0028] According to one embodiment, the innermost terminating layer of the tubular line 1—preferably and in this embodiment, a barrier layer 8—may have a conductive additive to make it conductive. If, according to an alternative embodiment variant not shown in the drawings, the innermost layer 6 is formed as the innermost terminating layer of the tubular line 1, then the innermost layer 6 may have this conductive additive.

[0029] Suitably and in this embodiment, the outer layer 7 is substantially composed of aliphatic polyamide, preferably polyamide 6.12. The outer layer 7 may additionally contain additives. Recommendedly and in this embodiment, at least 95% by weight of the outer layer 7 is composed of polyamide 6.12. Furthermore, an outer layer 4 is provided, which is preferably and in this embodiment according to the drawings, internally connected to the outer layer 7. According to a preferred embodiment and in this embodiment, the outer layer 4 is substantially composed of polyamide 6 and may additionally contain additives, wherein suitably and in this embodiment, at least 95% by weight of the outer layer 4 is composed of polyamide 6.

[0030] According to the invention, an adhesion promoter layer 5 is provided, which is preferably based on polypropylene. Recommendedly, and in this embodiment, the adhesion promoter layer 5 is inwardly connected to the inner layer 4. Suitably, and in this embodiment, the adhesion promoter layer 5 is substantially composed of polypropylene and may additionally contain additives. In this embodiment, at least 95% by weight of the adhesion promoter layer 5 may be composed of polypropylene.

[0031] According to the invention, an inner layer 6 is provided, which is composed of at least one thermoplastic elastomer. Suitably, the inner layer 6 is internally connected to the adhesive layer 5. Recommendedly, and in this embodiment, the thermoplastic elastomer of the inner layer 6 is based on ethylene-propylene-diene rubber (EPDM). Preferably, and in this embodiment, the thermoplastic elastomer of the inner layer 6 is a thermoplastic vulcanizate based on EPDM, and more particularly preferably, the inner layer 6 is substantially composed of thermoplastic vulcanizate and may additionally contain additives. In this respect, it is particularly preferred that at least 95% by weight of the inner layer 6 is composed of an EPDM-based thermoplastic elastomer or thermoplastic vulcanizate.

[0032] Suitably, and in this embodiment, the barrier layer 8 is inwardly connected to the inner layer 6. The barrier layer 8 then forms an inner layer as in the tubular line 1. The barrier layer 8 or the inner layer is preferably, and in this embodiment, in direct contact with the fluid temperature-regulating medium guided in the fluid channel 2. It is recommended that the barrier layer 8 be substantially composed of polypropylene. The barrier layer 8 may contain additional additives. Preferably, and in this embodiment, at least 95% by weight of the barrier layer 8 is composed of polypropylene.

[0033] The total layer thickness d of the tube wall portion 3 of the tubular circuit 1 is suitably 0.5 to 2.5 mm, preferably 0.6 to 2.2 mm, and particularly preferably 0.75 to 2.0 mm. Recommendedly, and in this embodiment, the outer layer 7 has a greater layer thickness than the adsorbent layer 5. Preferably, and in the layer composite structure shown in the figures, the adsorbent layer 5 is the layer with the smallest layer thickness. Therefore, suitably, and in this embodiment, the outer layer 7, the outermost layer 4, the innermost layer 6, and the barrier layer 8 are each thicker than the adsorbent layer 5. Furthermore, within the scope of the invention and in this embodiment, the barrier layer 8 has a greater layer thickness than the innermost layer 6.

Claims

1. A multi-layered automotive tubular circuit for passing through at least one fluid medium, the tubular circuit comprising a fluid channel and a wall portion surrounding the fluid channel, wherein the wall portion has a five-layer structure, the five layers being arranged sequentially from the outside to the inside as follows: Including the outer layer of polyamide; Including the outer layer of polyamide; Adhesive layer; Including at least one inner layer of a thermoplastic elastomer; and Barrier layer, in, The barrier layer is disposed radially inside the innermost layer and directly adjacent to the innermost layer. The barrier layer forms the innermost radial layer of the pipe wall portion and is in direct contact with at least one fluid medium in the fluid channel. The multi-layered tubular circuit is at least partially configured as a corrugated pipe.

2. The multi-layered vehicle tubular wiring according to claim 1, wherein, The multi-layered tubular circuit is entirely constructed as a corrugated pipe.

3. The multi-layered vehicle tubular wiring according to claim 1 or 2, wherein, The pipe wall has circumferential crests and circumferential troughs.

4. The multi-layered vehicle tubular wiring according to claim 3, wherein, The circumferential crests and circumferential troughs are located on at least a portion of the length of the multi-layered tubular line.

5. The multi-layered motor vehicle tubular wiring according to claim 3 or 4, wherein, The circumferential crests and circumferential troughs have substantially the same spacing from each other over at least a portion of the length of the multi-layered tubular line.

6. The multi-layered vehicle tubular wiring according to claim 5, wherein, The circumferential crests and circumferential troughs are substantially the same distance apart from each other over the entire length of the multi-layered tubular line.

7. The multi-layered motor vehicle tubular wiring according to any one of claims 1 to 6, wherein, The barrier layer includes at least one conductive additive to make the barrier layer conductive.

8. The multi-layered vehicle tubular wiring according to claim 7, wherein, The barrier layer is the innermost radial conductive layer of the pipe wall.

9. The multi-layered motor vehicle tubular wiring according to claim 7 or 8, wherein, The at least one conductive additive is disposed in the barrier layer that is in direct contact with the at least one fluid medium in the fluid channel.

10. The multi-layered motor vehicle tubular wiring according to any one of claims 1 to 9, wherein, The barrier layer comprises polypropylene.

11. The multi-layered motor vehicle tubular wiring according to any one of claims 1 to 10, wherein, The barrier layer comprises at least 90% by weight polypropylene.

12. The multi-layered motor vehicle tubular wiring according to any one of claims 1 to 11, wherein, The inner layer comprises a thermoplastic elastomer based on ethylene-propylene-diene rubber (EPDM).

13. The multi-layered vehicle tubular wiring according to claim 12, wherein, The thermoplastic elastomer in the innermost layer is thermoplastic vulcanized rubber.

14. The multi-layered motor vehicle tubular wiring according to any one of claims 1 to 13, wherein, The innermost layer comprises at least 90% by weight of the at least one thermoplastic elastomer.

15. The multi-layered motor vehicle tubular wiring according to any one of claims 1 to 14, wherein, The adhesive layer is based on at least one polyolefin.

16. The multi-layered vehicle tubular wiring according to claim 15, wherein, The adhesive layer is based on polypropylene.

17. The multi-layered motor vehicle tubular wiring according to any one of claims 1 to 16, wherein, The outer layer comprises polyamide 6.

12.

18. The multi-layered motor vehicle tubular wiring according to any one of claims 1 to 17, wherein, The outermost layer includes polyamide 6.

19. The multi-layered motor vehicle tubular wiring according to any one of claims 1 to 18, wherein, The total thickness of the pipe wall portion is 0.3 mm to 3.0 mm.

20. The multi-layered motor vehicle tubular wiring according to any one of claims 1 to 19, wherein, The thickness of the barrier layer is greater than the thickness of the innermost layer.

21. The multi-layered motor vehicle tubular wiring according to any one of claims 1 to 20, wherein, The thickness of the outer layer is greater than the thickness of the adhesive layer.

22. The multi-layered motor vehicle tubular wiring according to any one of claims 1 to 21, wherein, The multi-layered tubular circuitry is configured as a temperature control circuit or cooling circuit for the battery system of electric or hybrid vehicles.

23. The multi-layered motor vehicle tubular wiring according to any one of claims 1 to 22, wherein, The at least one fluid medium includes an alcohol-water mixture.

24. The multi-layered vehicle tubular wiring according to claim 23, wherein, The at least one fluid medium includes an ethylene glycol-water mixture.

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