CN219143832U - Automobile Ethernet wire structure - Google Patents
Automobile Ethernet wire structure Download PDFInfo
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- CN219143832U CN219143832U CN202223046466.4U CN202223046466U CN219143832U CN 219143832 U CN219143832 U CN 219143832U CN 202223046466 U CN202223046466 U CN 202223046466U CN 219143832 U CN219143832 U CN 219143832U
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Abstract
The utility model discloses an automobile Ethernet cable structure, and belongs to the technical field of cables. The automobile Ethernet wire structure comprises a wire body, a shielding layer and a braiding layer. The wire body comprises two signal wires which are mutually twisted; the shielding layer is spirally wrapped outside the wire body, and the wrapping direction of the shielding layer is opposite to the twisting direction of the two signal wires; the braid is braided outside the shield layer. The automobile Ethernet cable material structure can improve the stability of signal transmission.
Description
Technical Field
The utility model relates to the technical field of cables, in particular to an automobile Ethernet cable structure.
Background
With the development of unmanned technology, as a new automotive bus specification, a vehicle communication system will include the following requirements and functions: vehicle information and entertainment systems; advanced driver assistance systems, on-board diagnostic systems, and external interconnection technologies for automobiles have also been developed in a relatively new direction, and therefore, the wire requirements for use are also higher.
At present, the Ethernet wires in the wire market do not meet the OEM/RFI requirements of the automobile market, and the stability of high-frequency signal transmission is poor.
Disclosure of Invention
An object of the present utility model is to provide an automotive ethernet cable structure, which can improve signal transmission stability.
To achieve the purpose, the utility model adopts the following technical scheme:
the automobile Ethernet wire structure comprises a wire body, a shielding layer and a braiding layer. The wire body comprises two signal wires which are mutually twisted; the shielding layer is spirally wrapped outside the wire body, and the wrapping direction of the shielding layer is opposite to the twisting direction of the two signal wires; the braid is braided outside the shield layer.
Optionally, each signal line comprises a conductor and an insulating layer, wherein the insulating layer is coated outside the conductor, and the conductor comprises a plurality of tin-plated oxygen-free copper wires which are twisted with each other.
Optionally, the diameter of the tin-plated oxygen-free copper wire is 0.155+0.03/-0mm.
Optionally, the shielding layer is an aluminum foil shielding layer.
Optionally, the aluminum foil shielding layer is single-sided, and the conductive surface of the aluminum foil shielding layer faces outwards.
Optionally, the overlapping rate of the aluminum foil shielding layer is 40% -60%.
Optionally, the shielding layer is formed by wrapping an aluminum foil with a thickness of 25 μm and a width of 10 mm.
Optionally, the woven fabric further comprises a sheath layer, wherein the sheath layer is coated outside the woven fabric.
Optionally, the braiding layers are braided by adopting 16 ingots/7 tinned copper wires/0.10+/-0.008 mm.
Optionally, the number of meshes of the braiding layer is 11.5+/-2 meshes.
The processing method of the automotive Ethernet wire structure comprises the following steps:
s1, selecting a plurality of anaerobic tinned copper wires, twisting the plurality of anaerobic tinned copper wires into a conductor, and coating an insulating layer on the conductor to form a signal wire;
s2, selecting two signal wires, and twisting the two signal wires together;
s3, spirally wrapping a shielding layer on the two twisted signal wires, wherein the wrapping direction of the shielding layer is opposite to the twisting direction of the two signal wires;
s4, wrapping the shielding layer with a braiding layer.
Optionally, after step S4, the method further includes:
s5, coating a sheath layer on the braiding layer.
Optionally, in step S2, the lengths of the two selected signal lines are equal or differ by 1-2mm; and stranding the two signal wires together by adopting a stranding machine, and setting the twisting distance of the stranding machine to be 39+/-2 mm.
The beneficial effects of the utility model are as follows:
according to the automotive Ethernet cable structure, the twisting directions of the two signal wires are reversely set to be opposite to the wrapping direction of the shielding layer, so that the twisting distance of the signal wires can be stably kept, deformation is reduced, the wire diameter quality after the shielding layer is wrapped is high, and the improvement of high-frequency stability is facilitated.
Drawings
Fig. 1 is a schematic cross-sectional structure of an automotive ethernet wire structure according to an embodiment of the present utility model;
FIG. 2 is a graph of differential characteristic impedance measured for an automotive Ethernet wire structure (signal test from left end test) provided in an embodiment of the utility model;
FIG. 3 is a graph of differential characteristic impedance measured for an automotive Ethernet wire structure (signal test from right-hand test) provided in an embodiment of the utility model;
FIG. 4 is a graph of the intra-pair delay difference of a first signal line measured for an automotive Ethernet cable structure according to one embodiment of the utility model;
FIG. 5 is a graph of the intra-pair delay difference of another first signal line measured for an automotive Ethernet wire structure according to one embodiment of the utility model;
fig. 6 is a graph of attenuation measured for an automotive ethernet wire structure provided in accordance with an embodiment of the present utility model.
In the figure:
1. a wire body; 11. a conductor; 12. an insulating layer;
2. a shielding layer;
3. a braiding layer;
4. and a sheath layer.
Detailed Description
In the description of the present utility model, it should be noted that the directions or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present utility model. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. Wherein the terms "first position" and "second position" are two different positions.
Unless specifically stated or limited otherwise, the terms "mounted," "connected," and "fixed" are to be construed broadly, and may be, for example, either fixed or removable; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.
Unless expressly stated or limited otherwise, a first feature being "above" or "below" a second feature may include the first feature and the second feature being in direct contact, or may include the first feature and the second feature not being in direct contact but being in contact with each other by way of additional features therebetween. Moreover, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly under and obliquely below the second feature, or simply means that the first feature is less level than the second feature.
The technical scheme of the utility model is further described below by the specific embodiments with reference to the accompanying drawings.
The embodiment provides an automotive Ethernet wire structure, as shown in fig. 1, which comprises a wire body 1, a shielding layer 2 and a braiding layer 3. The wire body 1 includes two signal wires twisted with each other. The shielding layer 2 is spirally wrapped outside the wire body 1, and the wrapping direction of the shielding layer 2 is opposite to the twisting direction of the two signal wires. For example, the twisting direction of the two signal wires of the wire body 1 is left, and the binding direction of the shielding layer 2 is right; the twisting direction of the two signal wires of the wire body 1 is rightward, and the binding direction of the shielding layer 2 is leftward. The braid 3 is braided outside the shield layer 2.
According to the automotive Ethernet cable structure, the twisting directions of the two signal wires are reversely set to be opposite to the wrapping direction of the shielding layer 2, so that the twisting distance of the signal wires can be stably kept, deformation is reduced, the wire diameter quality after the shielding layer 2 is wrapped is high, and the stability of high frequency is improved.
Further, each signal line comprises a conductor 11 and an insulating layer 12, the insulating layer 12 is coated outside the conductor 11, and the conductor 11 comprises a plurality of tin-plated oxygen-free copper wires which are twisted with each other. The tin-plated oxygen-free copper wire can resist oxidation and prolong the service life. In detail, the insulating layer 12 is a polypropylene insulating layer 12 that can satisfy an aging grade at a temperature of 105 ℃. The diameter of the signal line formed by coating the conductor 11 with the insulating layer 12 is 1.30 + -0.03 mm. The insulating layer 12 of one of the two signal lines is black and the insulating layer 12 of the other is true color to facilitate distinguishing the two signal lines.
In detail, the diameter of the tin-plated oxygen-free copper wire is 0.155+0.03/-0mm. Optionally, each conductor 11 comprises seven tin-plated oxygen-free copper wires.
In this embodiment, the shielding layer 2 is preferably an aluminum foil shielding layer, and high-frequency interference can be prevented by the aluminum foil shielding layer, so that the performance of high-frequency transmission is improved.
Further, the aluminum foil shielding layer is single-sided, and the conductive surface of the aluminum foil shielding layer faces outwards, so that the shielding layer 2 can be in short circuit with the weaving layer 3, the shielding effect is improved, and the signal transmission rate of the automobile Ethernet wire structure in the embodiment is improved.
The 9Gbps (and above) ethernet has too much radio frequency "noise" and is also susceptible to "extraneous" noise from other devices in the vehicle, which cannot guarantee delay to fall to the low microsecond range. In order to solve the problems, the overlapping rate of the aluminum foil shielding layer is 40% -60%, so that the shielding effect can be better improved, and the anti-interference capability of high-frequency transmission signals can be improved.
In this embodiment, the shielding layer 2 is preferably wrapped with an aluminum foil having a thickness of 25 μm and a width of 10 mm. If the width of the aluminum foil is too narrow, the overlapping rate cannot reach the required range, and if the width of the aluminum foil is too large, the signal wire is wrapped in a non-compact manner, so that the stability of high-frequency signal transmission and the appearance quality after the signal wire is wrapped in the aluminum foil are affected. Of course, the specification of the shielding layer 2 can be selected by those skilled in the art as required, and is not limited herein.
In detail, the braid 3 is formed of 16 ingots/7 pieces/0.10.+ -. 0.008mm (i.e., the braid 3 is formed of 16 strands of tin-plated copper wires, each of which is formed by combining 7 tin-plated copper wires of 0.10.+ -. 0.008 mm). The number of the weaving meshes of the weaving layer 3 is 11.5+/-2 meshes, and the holding force can be effectively improved by matching with the assembly processing.
Further, the automotive ethernet wire structure in this embodiment further includes a sheath layer 4, which is wrapped outside the braid layer 3. Through setting up restrictive coating 4, protect inside weaving layer 3, signal line, shielding layer 2, can make the outward appearance of car ethernet wire structure in this embodiment smoother. Optionally, the sheath layer 4 is a PVC sheath layer, resistant to high temperatures of 105 degrees celsius.
The processing method of the automotive Ethernet wire structure comprises the following steps:
s1, selecting a plurality of anaerobic tinned copper wires, twisting the anaerobic tinned copper wires into a conductor 11, and coating an insulating layer 12 on the conductor 11 to form a signal wire.
In detail, an insulating layer 12 was molded on a conductor 11 using a 50mm extruder. The control is needed in the production process: 1) Signal line concentricity requirement averages >90% (test method: minimum skin thickness/maximum skin thickness); 2) The adhesive force of the signal wire is 0.6-1.3 KGF; 3) Before the insulating layer 12 is extruded, the conductor 11 needs to be preheated by a preheater with the preheating temperature of about 60 ℃, and the signal wire after the insulating layer 12 is extruded needs to be cooled by a cooling water tank with the temperature of about 70 ℃, so that the wire drawing speed of wire drawing equipment is 100m/min.
S2, selecting two signal wires, and twisting the two signal wires together.
Specifically, a 500-type high-frequency stranding machine is adopted, the strand length is set to 39+/-2 mm, and if the strand length is small, two signal wires are easy to squeeze flat, so that the high-frequency characteristic transmission is influenced. If the lay length is large, the difference between the lengths of the two signal lines is liable to occur, thereby affecting the transmission of high frequency characteristics. When the automobile Ethernet cable structure is twisted, the positions of the two signal wires are horizontally arranged, and the lengths of the two signal wires are always or are different by 1-2mm, so that the stability of high-frequency signal transmission of the automobile Ethernet cable structure in the embodiment is guaranteed.
S3, spirally wrapping the shielding layer 2 on the two twisted signal wires, wherein the wrapping direction of the shielding layer 2 is opposite to the twisting direction of the two signal wires;
and (3) wrapping by adopting an aluminum foil wrapping machine, and in detail, if the twisting direction of the two signal wires is rightward, wrapping the aluminum foil by the aluminum foil wrapping machine to the left. Or if the twisting direction of the two signal wires is left, the direction of wrapping the aluminum foil by the aluminum foil wrapping machine is right.
S4, coating the shielding layer 2 with the braiding layer 3.
In detail, a high-speed 16-spindle braiding machine table is adopted, the braiding pitch is 17.6+/-2 mm, the number of the braided meshes is 11.5+/-2 meshes, and the shielding rate is more than 95%, so that the holding force of the automobile Ethernet wire structure in the embodiment is improved.
Further, step S4 is followed by step S5, where the braid 3 is covered with a jacket layer 4.
In detail, a 75mm special extruder is adopted to form the sheath layer 4, and a non-contact laser diameter measuring instrument is arranged in the extrusion process to measure the outer diameter; the concave-convex tester is arranged to detect concave-convex points outside the sheath layer 4, so that the smooth and uniform surface is ensured; the spark tester is arranged to detect whether the outer surface of the sheath layer 4 is damaged or not, so that the quality of the sheath layer 4 is ensured.
For the automotive ethernet wire structure in this embodiment, the high-frequency characteristic test is performed by using the high-frequency test software of the high-frequency society, and the result is as follows:
1. as shown in fig. 2 and 3, the test contents: differential characteristic impedance
| Requirements for | Test results | |
| 100±5Ω | 97.88Ω～99.74Ω | Compliance with |
2. As shown in fig. 4 and 5, the test contents: time difference of delay
Description: testing the two signal lines to obtain the difference value:
5.2574ns-5.2672ns＝0.0002ns＝0.2ps
3. as shown in fig. 6, the test contents: attenuation of
In summary, the automotive ethernet wire structure in this embodiment can satisfy:
TDR Impedance：100±5ohm；skew≤10ps/m；
Insertion Loss：≥-3dB@2.5GHz；≥-4.5B@5GHz；≥-9dB@9GHz。
the technical principle of the present utility model is described above in connection with the specific embodiments. The description is made for the purpose of illustrating the general principles of the utility model and should not be taken in any way as limiting the scope of the utility model. Other embodiments of the utility model will be apparent to those skilled in the art from consideration of this specification without undue burden.
Claims (10)
1. Car ethernet cable line structure, its characterized in that includes:
the wire rod body (1), the wire rod body (1) includes two signal lines stranded mutually;
the shielding layer (2) is spirally wrapped outside the wire body (1), and the wrapping direction of the shielding layer (2) is opposite to the twisting direction of the two signal wires; a kind of electronic device with high-pressure air-conditioning system
And the braiding layer (3) is braided outside the shielding layer (2).
2. The automotive ethernet wire structure of claim 1, wherein each of said signal wires comprises a conductor (11) and an insulating layer (12), said insulating layer (12) being wrapped around said conductor (11), said conductor (11) comprising a plurality of tin-plated oxygen-free copper wires stranded with each other.
3. The automotive ethernet wire structure of claim 2, wherein the tin-plated oxygen-free copper wire has a diameter of 0.155+0.03/-0mm.
4. The automotive ethernet wire structure of claim 1, wherein said shielding layer (2) is an aluminum foil shielding layer.
5. The automotive ethernet wire structure of claim 4, wherein the aluminum foil shield is single sided with the conductive side of the aluminum foil shield facing outward.
6. The automotive ethernet wire structure of claim 4, wherein the aluminum foil shielding layer has an overlap ratio of 40% -60%.
7. The automotive ethernet wire structure of claim 1, wherein said shielding layer (2) is wrapped with an aluminum foil having a thickness of 25 μm and a width of 10 mm.
8. The automotive ethernet wire structure of any one of claims 1-7, further comprising a jacket layer (4), said jacket layer (4) being wrapped outside said braid (3).
9. The automotive ethernet wire structure according to any one of claims 1 to 7, wherein said braid (3) is braided from 16 ingots/7 strips/0.10±0.008mm tinned copper wire.
10. The automotive ethernet wire structure according to any one of claims 1 to 7, wherein the braiding mesh number of the braiding layer (3) is 11.5±2 mesh.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223046466.4U CN219143832U (en) | 2022-11-16 | 2022-11-16 | Automobile Ethernet wire structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223046466.4U CN219143832U (en) | 2022-11-16 | 2022-11-16 | Automobile Ethernet wire structure |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219143832U true CN219143832U (en) | 2023-06-06 |
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ID=86567268
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202223046466.4U Active CN219143832U (en) | 2022-11-16 | 2022-11-16 | Automobile Ethernet wire structure |
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| Country | Link |
|---|---|
| CN (1) | CN219143832U (en) |
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- 2022-11-16 CN CN202223046466.4U patent/CN219143832U/en active Active
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