Vehicle-mounted Ethernet cable with high transmission rate

Abstract

The utility model relates to the technical field of network cables, in particular to a vehicle-mounted Ethernet cable with a high transmission rate. Two parallel core wires are wrapped with a PTFE belt layer, a first aluminum foil layer and a polyester belt layer, the outer side of the polyester belt layer is sequentially wrapped with a second aluminum foil layer, a braid layer and a sheath layer, and each core wire comprises a center conductor, a Teflon foaming layer and an outer skin insulating layer, and the center conductor is sequentially wrapped with the Teflon foaming layer and the outer skin insulating layer. The ultra-low dielectric constant of the PTFE belt layer ensures that the wire has lower insertion loss and can meet the attenuation requirement of the transmission rate of 25Gbps / s, meanwhile, the Teflon foaming layer has lower dielectric constant, so that the wire has lower attenuation, and the shielding mode of longitudinally wrapping the first aluminum foil layer on the periphery of the core wire is adopted, so that the shielding performance of the wire is improved. The wire transmission rate can reach 25Gbps / s, the polyester belt layer is adopted for coating, the structure of the wire can be more stable, the first aluminum foil layer does not have gaps, deformation and the like under the condition that the wire is bent, and therefore high-speed and stable transmission of core wire signals is guaranteed.

Description

Technical Field

[0001] The present application relates to the technical field of network cables, and in particular to a high-transmission-rate in-vehicle Ethernet cable. Background Art

[0002] With the development of the automobile industry, the complexity of automobile E / E architecture and functions is constantly increasing, which has brought about the demand for increased vehicle data transmission bandwidth and changes in communication methods. Traditional vehicle network cables use a structure of twisted signal lines plus shielding and sheathing, which is difficult to meet the transmission rate of 25Gbps / s. It is necessary to design vehicle network cables with lower insertion loss. Utility Model Content

[0003] In order to solve the above technical problems, the present application provides a high transmission rate in-vehicle Ethernet cable, comprising two parallel core wires, a PTFE tape layer wrapped around the two core wires, a first aluminum foil layer and a polyester tape layer, a second aluminum foil layer, a braided layer and a sheath layer are sequentially coated on the outside of the polyester tape layer, and a plurality of filling strips are arranged between the polyester tape layer and the second aluminum foil layer; the core wire comprises a central conductor, a Teflon foam layer sequentially coated on the central conductor and an outer insulation layer.

[0004] Preferably, the central conductor is a three-layer structure, the inner layer is a silver-plated conductor, the middle layer is 6 silver-plated conductors twisted around the inner layer, and the outer layer is 12 silver-plated conductors twisted around the middle layer.

[0005] Preferably, the twisting pitch of the middle layer is 3 to 5 mm; and the twisting pitch of the outer layer is 6 to 8 mm.

[0006] Preferably, the first aluminum foil layer is a double-layer structure, the inner layer of the first aluminum foil layer is an aluminum layer, and the outer layer is a plastic layer coated with hot melt adhesive.

[0007] Preferably, the polyester tape layer has two layers, and the two polyester tape layers are reversely wrapped around the periphery of the plastic layer.

[0008] Preferably, the filling strip is glass fiber.

[0009] Preferably, the outer insulating layer is a solid layer of Teflon material.

[0010] Preferably, the diameter of the silver-plated conductor is 0.1 mm, and the thickness of the silver layer of the silver-plated conductor is 1.2 μm.

[0011] As can be seen from the above, the following beneficial effects can be obtained by applying the present application: by wrapping PTFE tape layer, first aluminum foil layer and polyester tape layer around two parallel core wires, the second aluminum foil layer, braided layer and sheath layer are sequentially coated on the outside of the polyester tape layer, and a plurality of filling strips are arranged between the polyester tape layer and the second aluminum foil layer, the core wire includes a central conductor, a Teflon foam layer sequentially coated on the central conductor and an outer insulation layer. The ultra-low dielectric constant of the PTFE tape layer ensures that the wire will have a lower insertion loss, and ensures that the wire can meet the attenuation requirements of the transmission rate of 25Gbps / s. At the same time, the Teflon foam layer has a lower dielectric constant, which makes the wire have a lower attenuation. The core wire adopts a shielding method of longitudinally wrapping the first aluminum foil layer, which can ensure that its line transmission rate reaches 25Gbps / s. The polyester tape layer is coated to make its structure more stable, so that when the wire is bent, the first aluminum foil layer will not have gaps, deformation, etc., thereby ensuring the high-speed and stable transmission of the core wire signal. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings required for use in the description of the embodiments of the present application or the prior art are briefly introduced below. Obviously, the drawings described below are only part of the embodiments of the present application, and for ordinary technicians in this field, other drawings can be obtained based on these drawings without creative labor.

[0013] Figure 1 This is a schematic diagram of the structure of a high-transmission-rate in-vehicle Ethernet cable according to an embodiment of the present application. DETAILED DESCRIPTION

[0014] The technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0015] Example

[0016] In order to solve the above technical problems, this embodiment provides a high transmission rate vehicle Ethernet cable, such as Figure 1As shown, it includes two parallel core wires 10, a PTFE tape layer 20 wrapped around the two core wires 10, a first aluminum foil layer 30 and a polyester tape layer 40, a second aluminum foil layer 50, a braided layer 60 and a sheath layer 70 are sequentially coated on the outside of the polyester tape layer 40, and a plurality of filling strips 80 are arranged between the polyester tape layer 40 and the second aluminum foil layer 50. The core wire 10 includes a central conductor 11, a Teflon foam layer 12 sequentially coated on the central conductor 11, and an outer insulation layer 13. The ultra-low dielectric constant of the PTFE tape layer 20 ensures that the wire will have a lower insertion loss, ensuring that the wire can meet the attenuation requirement of a transmission rate of 25 Gbps / s. At the same time, the Teflon foam layer 12 has a lower dielectric constant, which makes the wire have a lower attenuation. The core wire 10 adopts a shielding method of longitudinally wrapping the first aluminum foil layer 30 to ensure that its line transmission rate reaches 25 Gbps / s. The polyester tape layer 40 is used for wrapping to make its structure more stable, so that when the wire is bent, the first aluminum foil layer 30 will not have gaps or deformation, thereby ensuring high-speed and stable transmission of the core wire 10 signal.

[0017] The Teflon foaming layer 12 is a physical foaming layer, and the foaming degree is controlled at 30%, and the outer skin insulation layer 13 is a solid layer of Teflon material. By using solid Teflon as the protective layer of the inner layer, the double-layer material is tightly attached and inseparable, the overall relative dielectric constant is 1.8, and the temperature resistance level can reach 200°C.

[0018] Specifically, the center conductor 11 is a three-layer structure, the inner layer is a silver-plated conductor, the middle layer is 6 silver-plated conductors twisted around the inner layer, and the outer layer is 12 silver-plated conductors twisted around the middle layer. The twisting direction of the middle layer is the same as that of the outer layer. Among them, the diameter of the silver-plated conductor is 0.1mm, the thickness of the silver layer of the silver-plated conductor is 1.2μm, the twisting pitch of the middle layer is 3-5mm; the twisting pitch of the outer layer is 6-8mm. The silver-plated conductor used has better conductivity, lower impedance, and can provide smaller attenuation. The silver-plated layer on the surface of the conductor has high temperature resistance, and the 1.2μ thickened silver layer can be extruded through Teflon insulation at high temperature without melting or scratching its coating structure, thereby making the signal transmission more stable. The center conductor 11 adopts a three-layer twisted structure of 19 strands of silver-plated conductors, so that the structure of the twisted center conductor 11 is more stable, rounder, and softer.

[0019] Furthermore, the two core wires 10 are placed in parallel, and then wrapped with a PTFE tape layer 20 on the periphery of the two core wires 10. The PTFE tape layer 20 is a PTFE clinker tape. The PTFE tape layer 20 is wrapped in two layers, wherein the first layer of PTFE tape layer 20 is wrapped in the left direction, and the second layer is wrapped in the right direction, with an overlap rate of 50% and a wrapping gap rate of 0. Using a double-layer low dielectric constant PTFE clinker tape as the outer insulation can not only better fix the parallel pair structure, but also its ultra-low dielectric constant ensures that the wire will have a lower insertion loss, ensuring that the wire can meet the attenuation requirements of a transmission rate of 25Gbps / s. In addition, due to its characteristics and softness, the PTFE clinker tape can ensure that the wire still has a high degree of softness after double wrapping.

[0020] Furthermore, a first aluminum foil layer 30 is longitudinally wrapped around the periphery of the PTFE tape layer 20. The first aluminum foil layer 30 is a double-layer structure. The inner layer of the first aluminum foil layer 30 is a self-adhesive aluminum layer, and the outer layer is a plastic layer coated with hot melt adhesive. When longitudinally wrapping, the aluminum layer faces inward and the plastic layer faces outward, and then two layers of self-adhesive polyester tape layers 40 are wrapped around the periphery of the plastic layer. The wrapping directions of the two layers of polyester tape layers 40 are opposite, and after wrapping the outermost layer of polyester tape, the first aluminum foil layer 30 is passed through an oven to melt the hot melt adhesive of each wrapping tape. After cooling, the three-layer structure is tightly attached together to ensure the structural stability of the shielding layer.

[0021] Furthermore, since the two core wires 10 are arranged in parallel, they have a flat structure after wrapping. Therefore, a plurality of filling strips 80 need to be provided between the polyester tape layer 40 and the second aluminum foil layer 50. Specifically, two filling strips 80 are provided, and the filling strips 80 are made of glass fiber so that the wire is as close to a circle as possible after wrapping.

[0022] Furthermore, the second aluminum foil layer 50 and the braided layer 60 are used as the total shielding layer of the wire. The braided layer 60 adopts 7 0.1mm tinned soft copper wires with 8 ingots in the upper layer and 8 ingots in the lower layer. The braiding density is above 85%, which greatly improves the shielding effectiveness of the wire and makes the wire not affected by external interference signals when used. The sheath layer 70 adopts modified thermoplastic elastomer material specially used for automotive wires, which can work for a long time in the temperature range of 40℃ to 105℃, and has excellent oil resistance, temperature resistance, flame retardancy and other properties, and can achieve perfect protection for the signal core wire.

[0023] In summary, the present application scheme is to wrap two parallel core wires with a PTFE tape layer, a first aluminum foil layer and a polyester tape layer, and sequentially wrap a second aluminum foil layer, a braided layer and a sheath layer on the outside of the polyester tape layer, and a plurality of filling strips are provided between the polyester tape layer and the second aluminum foil layer. The core wire includes a central conductor, a Teflon foam layer sequentially wrapped on the central conductor, and an outer insulation layer. The ultra-low dielectric constant of the PTFE tape layer ensures that the wire will have a lower insertion loss, ensuring that the wire can meet the attenuation requirements of a transmission rate of 25Gbps / s. At the same time, the Teflon foam layer has a lower dielectric constant, which makes the wire have a lower attenuation. The core wire adopts a shielding method of longitudinally wrapping the first aluminum foil layer, which can ensure that its line transmission rate reaches 25Gbps / s. The polyester tape layer is wrapped to make its structure more stable, so that when the wire is bent, the first aluminum foil layer will not have gaps, deformation, etc., thereby ensuring high-speed and stable transmission of the core wire signal.

[0024] The above-described implementation methods do not constitute a limitation on the protection scope of the technical solution. Any modification, equivalent replacement and improvement made within the spirit and principle of the above-described implementation methods shall be included in the protection scope of the technical solution.

Claims

1. A high transmission rate vehicle Ethernet cable, characterized in that: The invention comprises two parallel core wires (10), a PTFE tape layer (20) wrapped around the two core wires (10), a first aluminum foil layer (30) and a polyester tape layer (40), a second aluminum foil layer (50), a braided layer (60) and a sheath layer (70) are sequentially coated on the outer side of the polyester tape layer (40), and a plurality of filling strips (80) are arranged between the polyester tape layer (40) and the second aluminum foil layer (50); the core wire (10) comprises a central conductor (11), a Teflon foam layer (12) sequentially coated on the central conductor (11) and an outer insulation layer (13).

2. The high transmission rate vehicle Ethernet cable according to claim 1, characterized in that: The central conductor (11) has a three-layer structure, wherein the inner layer is a silver-plated conductor, the middle layer is six silver-plated conductors twisted around the inner layer, and the outer layer is 12 silver-plated conductors twisted around the middle layer.

3. The high transmission rate vehicle-mounted Ethernet cable according to claim 2, characterized in that: The twisting pitch of the middle layer is 3-5 mm; the twisting pitch of the outer layer is 6-8 mm.

4. The high transmission rate vehicle Ethernet cable according to claim 1, characterized in that: The first aluminum foil layer (30) is a double-layer structure, wherein the inner layer of the first aluminum foil layer (30) is an aluminum layer, and the outer layer is a plastic layer coated with hot-melt adhesive.

5. The high transmission rate vehicle-mounted Ethernet cable according to claim 4, characterized in that: The polyester tape layer (40) has two layers, and the two layers of the polyester tape layer (40) are reversely wrapped around the outer periphery of the plastic layer.

6. The high transmission rate vehicle-mounted Ethernet cable according to claim 1, characterized in that: The filling strip (80) is glass fiber.

7. The high transmission rate vehicle-mounted Ethernet cable according to claim 1, characterized in that: The outer insulating layer (13) is a solid layer of Teflon material.

8. The high transmission rate vehicle-mounted Ethernet cable according to claim 2, characterized in that: The diameter of the silver-plated conductor is 0.1 mm, and the thickness of the silver layer of the silver-plated conductor is 1.2 μm.

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