A vehicle-mounted LVDS signal cable

Abstract

The present application relates to the technical field of signal cables, and in particular to an on-vehicle LVDS signal cable, wherein a self-adhesive aluminum foil layer, a self-adhesive polyester tape layer and an aluminum foil shielding layer are sequentially wrapped around the outer periphery of a core wire, a braided layer and a sheath layer are arranged around the outer periphery of the aluminum foil shielding layer, the core wire comprises a conductor and an insulating layer wrapped around the conductor, the insulating layer adopts a three-layer co-extrusion structure, so that the insulating layer and the conductor are in closer contact and fit, ensuring sufficient adhesion, thereby ensuring the stability of the structure, providing a stable and uniform transmission medium for the wire, and draining the induced current generated inside through a drainage line to avoid signal interference, and adopting a double-layer self-adhesive wrapping method of a self-adhesive aluminum foil layer and a self-adhesive polyester tape layer to make the core wire structure stable, making it more stable when transmitting high-frequency signals, the self-adhesive aluminum foil layer, the aluminum foil shielding layer and the braided layer can effectively and completely shield the internal structure of the wire, more effectively prevent interference from external signals, thereby ensuring stable signal transmission.

Description

Technical Field

[0001] The present application relates to the technical field of signal cables, and in particular to a vehicle-mounted LVDS signal cable. Background Art

[0002] With the development of the automobile industry, the complexity of automobile architecture and functions is constantly increasing, which brings about the demand for increasing vehicle data transmission bandwidth and changing communication methods. At the same time, with the trend of future intelligence and networking, the equipment and wiring inside the car are becoming more and more complicated. As LVDS cables are high-speed signal cables, they have extremely high requirements for wire attenuation and high temperature resistance. However, the existing vehicle-mounted twisted pair signal cables are difficult to meet the requirements of high-speed signal stable transmission and high temperature resistance, and cannot guarantee high-speed and stable signal transmission. Utility Model Content

[0003] In order to solve the above technical problems, the present application provides a vehicle-mounted LVDS signal cable, comprising two twisted core wires, a self-adhesive aluminum foil layer, a self-adhesive polyester tape layer and an aluminum foil shielding layer wrapped around the two core wires in sequence, a braided layer woven around the aluminum foil shielding layer, and a sheath layer extruded around the braided layer; it also includes a drainage wire arranged on the periphery of the core wire and in contact with the self-adhesive aluminum foil layer, the core wire comprises a conductor and an insulating layer wrapped around the conductor, and the insulating layer adopts a three-layer co-extrusion structure of an inner skin layer, a foaming layer and an outer skin layer.

[0004] Preferably, the conductor is formed by co-twisting 7 tinned annealed soft copper wires, the twisted structure is a central layer of 1 tinned annealed soft copper wire, and an outer layer of 6 tinned annealed soft copper wires, and the diameter of the tinned annealed soft copper wire is 0.16-0.18mm.

[0005] Preferably, the twist pitch of the two core wires is 10-11 mm.

[0006] Preferably, the thickness of the inner skin layer is 0.05-0.08 mm, the thickness of the foaming layer is 0.26-0.3 mm, and the thickness of the outer skin layer is 0.07-0.1 mm.

[0007] Preferably, the inner skin layer is made of linear low-density polyethylene, the outer skin layer is made of high-density polyethylene, and the foaming layer is made of a mixture of high-density polyethylene, linear low-density polyethylene and a nucleating agent.

[0008] Preferably, the drainage wire is formed by concentrically twisting 7 tinned copper wires, and the diameter of the tinned copper wire is 0.16-0.2 mm.

[0009] Preferably, the braiding angle of the braided layer is 65°-70°, and the braiding density is greater than 90%.

[0010] From the above, it can be seen that the application of the present application can obtain the following beneficial effects: by sequentially wrapping a self-adhesive aluminum foil layer, a self-adhesive polyester tape layer and an aluminum foil shielding layer around the core wire, a braided layer is woven around the aluminum foil shielding layer, and a sheath layer is extruded around the braided layer. The core wire includes a conductor and an insulating layer wrapped around the conductor. The insulating layer adopts a three-layer co-extrusion structure, so that the insulating layer and the conductor are in closer contact and fit, ensuring that there is sufficient adhesion between the two, thereby ensuring the stability of the structure, providing a stable and uniform transmission medium for the wire, and draining the induced current generated inside through the drainage line to avoid signal interference. The double-layer self-adhesive wrapping method of the self-adhesive aluminum foil layer and the self-adhesive polyester tape layer is adopted to make the core wire structure stable, making it more stable when transmitting high-frequency signals. The self-adhesive aluminum foil layer, the aluminum foil shielding layer and the braided layer can effectively and completely shield the internal structure of the wire, and more effectively prevent interference from external signals, thereby ensuring stable signal transmission. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] 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.

[0012] Figure 1 This is a schematic diagram of the structure of a vehicle-mounted LVDS signal cable according to an embodiment of the present application. DETAILED DESCRIPTION

[0013] 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. Example

[0014] In order to solve the above technical problems, this embodiment provides a vehicle-mounted LVDS signal cable, such as Figure 1As shown, it includes two twisted core wires 10, a self-adhesive aluminum foil layer 20, a self-adhesive polyester tape layer 30 and an aluminum foil shielding layer 40 wrapped around the two core wires 10 in sequence, a braided layer 50 is woven around the aluminum foil shielding layer 40, a sheath layer 60 is extruded around the braided layer 50, and also includes a drainage wire 70 arranged on the outer periphery of the core wire 10 and in contact with the self-adhesive aluminum foil layer 20. The core wire 10 includes a conductor 11 and an insulating layer 12 wrapped around the conductor 11. The insulating layer 12 adopts a three-layer co-extrusion structure of an inner skin layer 121, a foaming layer 122 and an outer skin layer 123, so that the insulating layer and the conductor 11 are more closely contacted and fit, ensuring that there is sufficient adhesion between the two. force, thereby ensuring the stability of the structure and providing a stable and uniform transmission medium for the wire. The insulating layer 12 is irradiated and cross-linked after extrusion to improve the thermal stability of the material. Even if the wire has a higher temperature level, the internal induced current is drained through the drainage line 70 to avoid signal interference. The double-layer self-adhesive wrapping method of the self-adhesive aluminum foil layer 20 and the self-adhesive polyester tape layer 30 is adopted to make the core wire 10 structure stable and make the high-frequency transmission signal more stable. The self-adhesive aluminum foil layer 20, the aluminum foil shielding layer 40 and the braided layer 50 can effectively shield the internal structure of the wire completely, and more effectively prevent the interference of external signals, thereby ensuring stable signal transmission.

[0015] Specifically, the conductor 11 is made of 7 tinned annealed soft copper wires twisted together, and the twisted structure is 1 tinned annealed soft copper wire in the center layer and 6 tinned annealed soft copper wires in the outer layer. The diameter of the tinned annealed soft copper wire is 0.16-0.18 mm, and the preferred diameter of the tinned annealed soft copper wire is 0.16 mm, which can ensure the roundness of the conductor 11 and the flexibility of the conductor 11. The diameter of the conductor 11 after twisting is 0.48 mm, which can ensure that the wire has lower signal attenuation during signal transmission.

[0016] Furthermore, the twist pitch of the two core wires 10 is 10-11 mm. Preferably, the twist pitch of 11 mm is adopted to have a higher bandwidth, and the double-layer self-adhesive wrapping method of the self-adhesive aluminum foil layer 20 and the self-adhesive polyester tape layer 30 makes the wire more stable when transmitting high-frequency signals.

[0017] Further, the thickness of the inner cortex 121 is 0.05-0.08mm, the thickness of the foaming layer 122 is 0.26-0.3mm, and the thickness of the outer cortex 123 is 0.07-0.1mm. Preferably, the thickness of the inner cortex 121 is 0.05mm, the thickness of the foaming layer 122 is 0.26mm, and the thickness of the outer cortex 123 is 0.07mm. Among them, the material of the inner cortex 121 is linear low-density polyethylene, the material of the outer cortex 123 is high-density polyethylene, and the material of the foaming layer 122 is a mixture of high-density polyethylene, linear low-density polyethylene and a nucleating agent, the content of high-density polyethylene is 70%, the content of linear low-density polyethylene is 28%, and the content of the nucleating agent is 2%. The selected linear low-density polyethylene as the inner cortex 121 can make the insulating layer and the conductor more closely contact and fit, and the selected linear low-density because of its linear molecular structure can ensure that the thermal stability of the material is more effectively improved after cross-linking. The outer layer 123 is made of 0.07 mm thick high-density polyethylene, which can better protect the foaming layer 122. At the same time, due to its high crystallinity and linear structure and no long-chain branching, it has a better cross-linking effect. After cross-linking, it can not only show higher thermal stability, but also better chemical resistance and corrosion resistance.

[0018] To avoid internal signal interference, a drain wire is added when the twisted core wires 10 are twisted. The drain wire 70 is formed by concentrically twisting 7 tinned copper wires. The diameter of the tinned copper wire is 0.16-0.2 mm, preferably 0.16 mm, and the drain wire 70 is in contact with the wrapped self-adhesive aluminum foil layer 20, so as to drain the internally generated induced current to avoid signal interference.

[0019] The aluminum foil shielding layer 40 and the braided layer 50 are used as the total shielding layer, the braiding angle of the braided layer 50 is 65°-70°, and the braiding density is greater than 90%. When braiding, the aluminum foil shielding layer 40 is dragged in longitudinally, and the longitudinal aluminum foil overlap rate is more than 25%, which can completely wrap the internal structure. The braided layer 50 fits tightly with the aluminum foil shielding layer 40, the braiding angle is 65°, and the braiding density is greater than 90%. The double-layer shielding can more effectively prevent interference from external signals, thereby ensuring stable signal transmission.

[0020] The sheath layer 60 is made of modified thermoplastic elastomer TPE material with a temperature resistance of 125°C. At the same time, the material remains soft even at a low temperature of -40°C, and the wire has excellent wear resistance. When the thickness is 0.3mm, the internal structure can still be well protected from external damage. In addition, the material has excellent oil resistance, acid resistance, alkali resistance and flame retardancy, which can ensure that the wire has high reliability during application.

[0021] In summary, the present invention sequentially wraps a self-adhesive aluminum foil layer, a self-adhesive polyester tape layer and an aluminum foil shielding layer around the periphery of the core wire, weaves a braided layer around the aluminum foil shielding layer, and extrude a sheath layer around the braided layer. The core wire includes a conductor and an insulating layer wrapped around the conductor. The insulating layer adopts a three-layer co-extrusion structure, so that the insulating layer and the conductor are in closer contact and fit, ensuring sufficient adhesion between the two, thereby ensuring the stability of the structure and providing a stable and uniform transmission medium for the wire. After extrusion, the insulating layer is irradiated and cross-linked to improve the thermal stability of the material. Even if the wire has a higher temperature level, the induced current generated inside is drained through the drainage line to avoid signal interference. The double-layer self-adhesive wrapping method of the self-adhesive aluminum foil layer and the self-adhesive polyester tape layer is adopted to make the core wire structure stable, making it more stable when transmitting high-frequency signals. The self-adhesive aluminum foil layer, the aluminum foil shielding layer and the braided layer can effectively completely shield the internal structure of the wire and more effectively prevent interference from external signals, thereby ensuring stable signal transmission.

[0022] 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 vehicle-mounted LVDS signal cable, characterized in that: The invention comprises two twisted core wires (10), a self-adhesive aluminum foil layer (20), a self-adhesive polyester tape layer (30) and an aluminum foil shielding layer (40) which are sequentially wrapped around the outer periphery of the two core wires (10), a braided layer (50) is woven around the outer periphery of the aluminum foil shielding layer (40), and a sheath layer (60) is extruded around the outer periphery of the braided layer (50); and further comprises a drainage wire (70) which is arranged around the outer periphery of the core wire (10) and contacts the self-adhesive aluminum foil layer (20), the core wire (10) comprises a conductor (11) and an insulating layer (12) wrapped around the outer periphery of the conductor (11), the insulating layer (12) adopts a three-layer co-extruded structure of an inner skin layer (121), a foaming layer (122) and an outer skin layer (123).

2. The vehicle-mounted LVDS signal cable according to claim 1, characterized in that: The conductor (11) is formed by twisting 7 tinned annealed soft copper wires coaxially, the twisted structure comprising a central layer of 1 tinned annealed soft copper wire and an outer layer of 6 tinned annealed soft copper wires, the diameter of the tinned annealed soft copper wire being 0.16-0.18 mm.

3. The vehicle-mounted LVDS signal cable according to claim 1, characterized in that: The twist pitch of the two core wires (10) is 10-11 mm.

4. The vehicle-mounted LVDS signal cable according to claim 1, characterized in that: The thickness of the inner skin layer (121) is 0.05-0.08 mm, the thickness of the foaming layer (122) is 0.26-0.3 mm, and the thickness of the outer skin layer (123) is 0.07-0.1 mm.

5. The vehicle-mounted LVDS signal cable according to claim 1, characterized in that: The drainage wire (70) is formed by concentrically twisting 7 tinned copper wires, and the diameter of the tinned copper wire is 0.16-0.2 mm.

6. The vehicle-mounted LVDS signal cable according to claim 1, characterized in that: The braiding angle of the braided layer (50) is 65°-70°, and the braiding density is greater than 90%.

Images