A vehicle-mounted anti-bending optical cable and its preparation method

Abstract

This application belongs to the field of optical fiber transmission technology, and more specifically, relates to a vehicle-mounted anti-bending optical cable and its manufacturing method. The optical cable includes an optical fiber, a composite braided layer, and a sheath arranged sequentially from the inside out. The composite braided layer includes a first braided layer, a second braided layer, and a third braided layer from the inside out. This application, by sequentially arranging a first braided layer, a second braided layer, and a third braided layer on the outer side of the optical fiber, using a mixture of aramid fiber, carbon fiber, and glass fiber, and adjusting the proportions of the three types of fibers in each braided layer, imparts excellent long-term anti-bending capability to the optical cable through the synergistic effect between the braided layers. This effectively alleviates friction generated during bending, protects the inner optical fiber from damage, and significantly reduces additional attenuation during bending. It features bend resistance, tensile strength, good flexibility, lightweight design, and excellent transmission performance, making it suitable for use as an optical cable in vehicle applications.

Description

Technical Field

[0001] This application belongs to the field of optical fiber cable technology for communication transmission, and more specifically, relates to a vehicle-mounted anti-bending optical fiber cable and its preparation method. Background Technology

[0002] With the rapid development of intelligent, connected, and electric vehicles, optical fiber cables, using fiber optics as the transmission medium, have become a key component of in-vehicle communication links due to their advantages such as high bandwidth, low latency, lightweight design, and resistance to electromagnetic interference. However, in the automotive application environment, traditional optical cables still have significant limitations. The compact interior space of a vehicle necessitates small-radius bending and twisting of the optical cable during installation. Simultaneously, vehicles experience various complex operating conditions during operation, including starting, braking, turning, and bumping, subjecting the optical cable to continuous mechanical stresses such as bending, twisting, and tension. In confined spaces and at connections with moving parts, the frequency and severity of bending are even higher.

[0003] Currently, commercially available general-purpose optical fiber cables generally have poor bending resistance. The internal optical fibers are easily damaged after repeated bending, leading to decreased signal transmission quality and increased attenuation. Furthermore, their protective layer is prone to plastic deformation or fatigue fracture under repeated dynamic bending stress, further degrading optical performance. These problems not only affect the accuracy and stability of data transmission but may also cause malfunctions in in-vehicle information systems, seriously impacting vehicle safety and user experience, and failing to meet the stringent requirements of the in-vehicle environment.

[0004] Therefore, there is an urgent need to develop an optical cable with excellent bending resistance, which can effectively protect the inner optical fiber from damage and significantly reduce the additional attenuation caused by bending, thereby improving the reliability and overall performance of the vehicle communication system. Summary of the Invention

[0005] In view of the shortcomings of the prior art, the purpose of this application is to provide a vehicle-mounted anti-bending optical cable and its preparation method, which aims to solve the problems of existing vehicle-mounted optical cables being unable to withstand long-term and repeated bending, having poor anti-bending performance and flexibility, large additional attenuation of optical signals, and even fiber breakage.

[0006] To achieve the above objectives, in a first aspect, this application provides a vehicle-mounted anti-bending optical cable, comprising an optical fiber, a composite braided layer, and a sheath arranged sequentially from the inside to the outside, wherein the composite braided layer comprises a first braided layer, a second braided layer, and a third braided layer arranged sequentially from the inside to the outside. The first, second, and third braided layers mentioned above are all made of composite fiber filaments containing aramid fiber, carbon fiber, and glass fiber. Wherein, the mass percentage of aramid fiber in the second braided layer or the third braided layer is less than the mass percentage of aramid fiber in the first braided layer; the mass percentage of carbon fiber in the first braided layer or the third braided layer is less than the mass percentage of carbon fiber in the second braided layer; and the mass percentage of glass fiber in the first braided layer or the second braided layer is less than the mass percentage of glass fiber in the third braided layer.

[0007] Preferably, the mass percentage of aramid fiber in the first braided layer is 60% to 70%. More preferably, the mass percentages of aramid fiber, carbon fiber, and glass fiber in the first braided layer are 60% to 70%, 0% to 30%, and 5% to 10%, respectively.

[0008] Preferably, the mass percentage of carbon fiber in the second braided layer is 50% to 60%. More preferably, the mass percentages of aramid fiber, carbon fiber, and glass fiber in the second braided layer are 5% to 20%, 50% to 60%, and 10% to 30%, respectively.

[0009] Preferably, the mass percentage of glass fiber in the third braided layer is 50% to 60%. More preferably, the mass percentages of aramid fiber, carbon fiber, and glass fiber in the third braided layer are 0% to 10%, 30% to 40%, and 50% to 60%, respectively.

[0010] Preferably, the thickness difference between any two adjacent braided layers (first, second, and third) is less than half the equivalent diameter of the optical fiber.

[0011] Preferably, the linear density of the aramid fiber is 100 dtex to 1610 dtex.

[0012] Preferably, the elastic modulus of the carbon fiber is 230 GPa to 390 GPa.

[0013] Preferably, the glass fiber has an elongation at break of 3% to 6% and an elastic modulus of 40 GPa to 100 GPa. More preferably, the glass fiber is a hydrophobic glass fiber.

[0014] Preferably, the optical fiber is a single-mode optical fiber, a multimode optical fiber, a loose fiber, an optical fiber ribbon, an optical fiber ribbon array, or a flexible optical fiber ribbon.

[0015] Preferably, the material of the sheath is one or more of thermoplastic polyurethane, low-smoke halogen-free polyolefin, polyvinyl chloride, polyethylene, polytetrafluoroethylene, perfluoroethylene propylene, polyurethane, and polyamide.

[0016] Secondly, this application provides a method for preparing the above-mentioned vehicle-mounted anti-bending optical cable, comprising the following steps: S1. The first composite fiber filament, the second composite fiber filament, and the third composite fiber filament are sequentially mixed and braided on the outside of the optical fiber to form a mixed braided layer with a first braided layer, a second braided layer, and a third braided layer arranged sequentially from the inside to the outside. The aforementioned first, second, and third composite fiber filaments all comprise aramid fibers, carbon fibers, and glass fibers; wherein, the mass percentage of aramid fibers in the first composite fiber filament is 60%–70%; the mass percentage of carbon fibers in the second composite fiber filament is 50%–60%; and the mass percentage of glass fibers in the third composite fiber filament is 50%–60%. S2. Extrude the sheath material onto the outside of the above-mentioned mixed braided layer to form a sheath.

[0017] Preferably, the mass percentages of aramid fiber, carbon fiber, and glass fiber in the first composite fiber filament are 60%~70%, 0%~30%, and 5%~10%, respectively.

[0018] Preferably, the mass percentages of aramid fiber, carbon fiber and glass fiber in the second composite fiber filament are 5%~20%, 50%~60% and 10%~30% respectively.

[0019] Preferably, the mass percentages of aramid fiber, carbon fiber and glass fiber in the third composite fiber filament are 0%~10%, 30%~40% and 50%~60% respectively.

[0020] In summary, the technical solutions conceived in this application have the following main technical advantages compared with the prior art: The vehicle-mounted anti-bending optical cable provided in this application includes an optical fiber, a composite braided layer, and a sheath arranged sequentially from the inside out. The composite braided layer includes a first braided layer, a second braided layer, and a third braided layer from the inside out. Each braided layer is woven from a composite fiber mixture containing aramid fiber, carbon fiber, and glass fiber. By setting the aforementioned composite braided layer on the outside of the optical fiber and adjusting the proportion of the three types of fibers in each braided layer, the first braided layer, which has a higher mass percentage of aramid fiber near the optical fiber, provides excellent buffering performance, effectively alleviating friction generated during bending and protecting the inner optical fiber from damage. At the same time, the second and third braided layers arranged sequentially on the outside of the first braided layer enhance the toughness of the composite braided layer, enabling it to withstand greater stress during bending and preventing excessive deformation or cracking, thus ensuring that the optical cable can still function normally under bending conditions. The synergistic effect between the braided layers endows the optical cable with excellent long-term bending resistance, protecting the internal optical fibers and structure from damage, while significantly reducing the additional attenuation during bending. It features bending resistance, tensile strength, good flexibility, lightweight, and excellent transmission performance, making it suitable for use as an optical cable in the automotive field. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the end face structure of the vehicle-mounted anti-bending optical cable provided in an embodiment of this application; In all the accompanying drawings, the same reference numerals are used to denote the same elements or structures, wherein: 1-optical fiber; 2-composite braided layer; 21-first braided layer; 22-second braided layer; 23-third braided layer; 3-sheath. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0023] In the description of this application, it should be understood that the term "and / or" describes a relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. The symbol " / " in this document indicates that the related objects are in an "or" relationship; for example, A / B means A or B.

[0024] In the specification and claims of this application, the terms “first,” “second,” and “third,” etc., are used to distinguish different objects, rather than to describe a specific order of objects, and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated.

[0025] In the description of the embodiments in this application, the words "exemplary" or "for example" are used to indicate that they are examples, illustrations, or descriptions. Any embodiment or design that is described as "exemplary" or "for example" in the embodiments of this application should not be construed as being more preferred or advantageous than other embodiments or design options. Specifically, the use of the words "exemplary" or "for example" is intended to present the relevant concepts in a specific manner.

[0026] In the description of the embodiments in this application, unless otherwise stated, "multiple" means two or more.

[0027] The term "equivalent diameter of optical fiber" refers to the diameter of a circle when a certain geometric shape or physical characteristic of the optical fiber is equivalent to that of a circle under specific conditions. In optical cables, the equivalent diameter of the optical fiber can be calculated using the following formula: D=(2 / n 1 / 2 )×df, where: D is the equivalent diameter of the optical fiber in the optical cable; n is the number of optical fibers; df is the diameter of a single optical fiber.

[0028] This application provides a vehicle-mounted anti-bending optical cable, comprising an optical fiber, a composite braided layer, and a sheath arranged sequentially from the inside to the outside. The composite braided layer includes a first braided layer, a second braided layer, and a third braided layer arranged sequentially from the inside to the outside. The first, second, and third braided layers mentioned above are all woven from composite fiber filaments containing aramid fibers, carbon fibers, and glass fibers; wherein, The mass percentage of aramid fibers in the second braided layer (22) or the third braided layer (23) is less than the mass percentage of aramid fibers in the first braided layer (21); the mass percentage of carbon fibers in the first braided layer (22) or the third braided layer (23) is less than the mass percentage of carbon fibers in the second braided layer (21); the mass percentage of glass fibers in the first braided layer (21) or the second braided layer (22) is less than the mass percentage of glass fibers in the third braided layer (23).

[0029] In some embodiments, the mass percentage of aramid fiber in the first braided layer is 60% to 70%; the mass percentage of carbon fiber in the second braided layer is 50% to 60%; and the mass percentage of glass fiber in the third braided layer is 50% to 60%.

[0030] In some embodiments, the mass percentages of aramid fiber, carbon fiber and glass fiber in the first braided layer are 60%~70%, 0%~30% and 5%~10%, respectively.

[0031] In some embodiments, the mass percentages of aramid fiber, carbon fiber and glass fiber in the second braided layer are 5%~20%, 50%~60% and 10%~30%, respectively.

[0032] In some embodiments, the mass percentages of aramid fiber, carbon fiber and glass fiber in the third braided layer are 0%~10%, 30%~40% and 50%~60%, respectively.

[0033] In some embodiments, the thickness difference between any two adjacent braided layers (first, second, and third) is less than half the equivalent diameter of the optical fiber. Specifically, the thickness difference between the first and second braided layers is less than half the equivalent diameter of the optical fiber, and the thickness difference between the second and third braided layers is also less than half the equivalent diameter of the optical fiber. By limiting the thickness difference between each braided layer, it is ensured that the force is smoothly transmitted and distributed when the optical cable is bent or compressed, with each braided layer working together to bear the load, thereby giving the optical cable excellent bending resistance.

[0034] In some embodiments, the thickness of the first braided layer, the second braided layer, and the third braided layer is not less than 0.05 mm. In some embodiments, the thickness of the first braided layer, the second braided layer, and the third braided layer is not greater than 0.6 times the equivalent diameter of the optical fiber.

[0035] In some embodiments, the linear density of the aramid fiber is 100 dtex to 1610 dtex. In some embodiments, the elastic modulus of the carbon fiber is 230 GPa to 390 GPa. In some embodiments, the elongation at break of the glass fiber is 3% to 6%, and the elastic modulus is 40 GPa to 100 GPa.

[0036] In some embodiments, to improve the water vapor erosion resistance of the composite braided layer and thus extend its service life, the glass fiber can be hydrophobic glass fiber. This application does not limit the source of the hydrophobic glass fiber; it can be purchased from commercially available products, or low surface energy substances can be introduced onto the glass fiber surface using common physical or chemical methods in the art to reduce its surface energy and obtain hydrophobic glass fiber. For example, a silane coupling agent can be coated onto the glass fiber surface using a silane coupling method. Specifically, a silane coupling agent (e.g., but not limited to hexadecyltrimethoxysilane, γ-aminopropyltriethoxysilane, methyltrimethoxysilane) can be prepared into a silane hydrolysate. The cleaned glass fiber is then impregnated in the silane hydrolysate, dried, and cured at high temperature, causing a condensation reaction between the silane and the glass fiber surface, as well as between silane molecules, to form a hydrophobic film. For example, a flexible hydrophobic coating can also be formed using a polymer coating method, utilizing the low surface energy of polydimethylsiloxane (PDMS) itself. Specifically, a PDMS prepolymer, curing agent, and solvent can be mixed to obtain a PDMS prepolymer. The PDMS prepolymer is then coated (e.g., but not limited to impregnation, spin coating, and spraying) onto a cleaned glass fiber surface and cured to obtain hydrophobic glass fiber. Alternatively, the glass fiber surface can be fluorinated to introduce low-surface-energy CF bonds. Specifically, perfluorooctyltriethoxysilane (PFOTES) can be used to prepare a PFOTES hydrolysate. The cleaned glass fiber is then impregnated in the PFOTES hydrolysate, dried, and cured at high temperature. The low-surface-energy CF bonds are fixed to the glass fiber surface through a condensation reaction, forming a hydrophobic surface. Alternatively, the surface can be modified with stearic acid, utilizing the interaction between long-chain fatty acids and the glass fiber surface or surface metal ions to form a hydrophobic surface. Specifically, stearic acid can be dissolved in an alcohol solvent to prepare a stearic acid solution. The cleaned glass fiber is then impregnated in the stearic acid solution and dried to obtain a hydrophobic surface.

[0037] This application does not specifically limit the type of optical fiber described above. Those skilled in the art can select appropriate types of optical fibers based on production needs, and all such selections fall within the scope of protection of this application. For example, the optical fibers described above may be single-mode optical fibers, multimode optical fibers, loose fibers, fiber ribbons, fiber ribbon arrays, or flexible fiber ribbons.

[0038] This application does not have any special limitations on the sheath material of the anti-bending optical cable. All materials reported in the prior art that are suitable for preparing the sheath are applicable to this application. Those skilled in the art can select appropriate sheath materials according to the application scenario of the anti-bending optical cable, such as, but not limited to, thermoplastic polyurethane (TPU), low smoke halogen-free polyolefin (LSZH), polyvinyl chloride (PVC), polyethylene (PE), polytetrafluoroethylene (PTFE), perfluoroethylene propylene (FEP), polyurethane (PU), polyamide (PA), etc.

[0039] On the other hand, this application also provides a method for preparing the above-mentioned vehicle-mounted anti-bending optical cable, comprising the following steps: S1. The first composite fiber filament, the second composite fiber filament, and the third composite fiber filament are sequentially mixed and braided on the outside of the optical fiber to form a mixed braided layer with a first braided layer, a second braided layer, and a third braided layer arranged sequentially from the inside to the outside. The aforementioned first, second, and third composite fiber filaments all contain aramid fibers, carbon fibers, and glass fibers; wherein, the mass percentage of aramid fibers in the first composite fiber filament is 60%–70%; the mass percentage of carbon fibers in the second composite fiber filament is 50%–60%; and the mass percentage of glass fibers in the third composite fiber filament is 50%–60%. S2. Extrude the sheath material onto the outside of the above-mentioned mixed braided layer to form a sheath.

[0040] In some embodiments, the mass percentages of aramid fiber, carbon fiber and glass fiber in the first composite fiber filament are 60%~70%, 0%~30% and 5%~10%, respectively.

[0041] In some embodiments, the mass percentages of aramid fiber, carbon fiber and glass fiber in the second composite fiber filament are 5%~20%, 50%~60% and 10%~30%, respectively.

[0042] In some embodiments, the mass percentages of aramid fiber, carbon fiber and glass fiber in the third composite fiber filament are 0%~10%, 30%~40% and 50%~60%, respectively.

[0043] It should be understood that materials of the same or similar type, model, quality, properties, or function as the reagents and instruments used in the following embodiments can be used to implement this application. Unless otherwise specified, the experimental methods used in the following embodiments are conventional methods. Unless otherwise specified, the materials and reagents used in the following embodiments are commercially available.

[0044] The following are examples and comparative examples: Example 1 The end-face structure diagram of the vehicle-mounted anti-bending optical cable provided in this embodiment is shown below. Figure 1 As shown, from the inside out, it includes optical fiber 1, composite braided layer 2, and sheath 3; wherein the composite braided layer 2 is provided with a first braided layer 21, a second braided layer 22, and a third braided layer 23 from the inside out.

[0045] In the bend-resistant optical cable provided in this application, optical fiber 1 is a polyacrylate single-mode optical fiber with an outer diameter of 0.25 mm; the optical fiber has a tight-buffered protective layer with an outer diameter of 0.9 mm; the above four 0.9 mm outer diameter tight-buffered fibers are twisted together, and the equivalent outer diameter of the optical fiber after twisting is 2.08 mm.

[0046] The first braided layer 21, the second braided layer 22, and the third braided layer 23 are all woven from composite fiber filaments composed of aramid fiber, carbon fiber, and glass fiber. In the first braided layer 21, the mass percentages of aramid fiber, carbon fiber, and glass fiber are 70%, 20%, and 10%, respectively, and the thickness is approximately 0.25 mm. In the second braided layer 22, the mass percentages of aramid fiber, carbon fiber, and glass fiber are 20%, 50%, and 30%, respectively, and the thickness is approximately 0.35 mm. In the third braided layer 23, the mass percentages of aramid fiber, carbon fiber, and glass fiber are 0%, 70%, and 30%, respectively, and the thickness is approximately 0.25 mm. The sheath 3 has a diameter of 5 mm and a thickness of 0.6 mm.

[0047] The above-mentioned method for preparing the bend-resistant optical cable includes the following steps: (1) On the outside of optical fiber 1, a first composite fiber filament (70%, 20%, and 10% by mass of aramid fiber, carbon fiber, and glass fiber) is mixed and braided using a 16-spindle braiding machine to form a first braided layer 21. The linear density of aramid fiber is 440 dtex, the elastic modulus of carbon fiber is 300 GPa, the breaking elongation of glass fiber is 4%, and the elastic modulus is 60 GPa. When the composite fiber filament is mixed and braided, the release tension is 0.5 N and the take-up tension is 2 N.

[0048] (2) On the outside of the first braided layer 21, the second composite fiber filaments (aramid fiber, carbon fiber and glass fiber with a mass percentage of 20%, 50% and 30%, respectively) are braided into the second braided layer 22 using a 16-spindle braiding machine.

[0049] (3) On the outside of the second braided layer 22, the third composite fiber filament (the mass percentages of aramid fiber, carbon fiber and glass fiber are 0%, 40% and 60%, respectively) is braided into the third braided layer 23 using a 16-spindle braiding machine.

[0050] (4) The thermoplastic polyurethane material is melted and extruded to cover the outside of the third braided layer 23 to form a sheath 3, thereby obtaining a bending-resistant optical cable.

[0051] Comparative Example 1 The bending-resistant optical cable provided in this comparative example is the same as that in Embodiment 1, except that the composite braided layer 2 only includes the first braided layer 21, which is the same as the first braided layer in Embodiment 1.

[0052] Comparative Example 2 The bending-resistant optical cable provided in this comparative example is the same as that in Embodiment 1, except that the composite braided layer 2 only includes the second braided layer 22, which is the same as the second braided layer in Embodiment 1.

[0053] Comparative Example 3 The bending-resistant optical cable provided in this comparative example is the same as that in Example 1, except that the composite braided layer 2 only includes a third braided layer 23, which is the same as the third braided layer in Example 1.

[0054] Examples 2-6 The specific parameters of the composite braided layer in the optical cables provided in Examples 2-6 and Comparative Examples 4-5 of this application are shown in Table 1, and the other structures of the optical cables are the same as in Example 1.

[0055]

[0056] The bending resistance of the optical cables manufactured in Examples 1-6 and Comparative Examples 1-5 was tested using the following methods: 1) The dynamic bending test shall be conducted in accordance with the description in GJB1428B-2009, with 10,000 cycles. The optical transmission performance (i.e., additional attenuation) of the optical cable shall be tested during the test, and the maximum additional attenuation value shall be recorded. The additional attenuation of multimode fiber shall not exceed 0.5dB, and the additional attenuation of single-mode fiber shall not exceed 0.2dB.

[0057] 2) The repeated bending test was conducted according to GJB1428B-2009, with a cycle rate of 30 cycles / min and a cycle count of 1 million. The optical transmission performance (i.e., additional attenuation) of the optical cable was tested during the experiment, and the maximum additional attenuation value was recorded. The additional attenuation for multimode fiber was required to be no greater than 0.5 dB, and the additional attenuation for single-mode fiber was required to be no greater than 0.2 dB. After the repeated bending test, the sheath and composite braided layer of the optical cable were peeled off, and the appearance of the area where the optical fiber underwent the repeated bending test was observed. Based on the appearance, the wear level was classified into grades 1, 2, 3, and 4, as shown in Table 2.

[0058] The bending resistance test results of the optical cables made in Examples 1-6 and Comparative Examples 1-5 are shown in Table 3.

[0059]

[0060]

[0061] As shown in Table 1, it is impossible to produce an optical cable with excellent bending resistance when using only a single braided layer or when the proportions of the three fibers in the first, second, and third braided layers of the composite braided layer are inappropriate. After repeated bending, the additional attenuation increases significantly. This application addresses this by sequentially assembling a first, second, and third braided layer from the inside out on the outer side of the optical fiber, consisting of a mixture of aramid fiber, carbon fiber, and glass fiber. The proportions of the three fibers in each braided layer are adjusted to ensure that the first braided layer on the outer side of the optical fiber provides excellent buffering performance, effectively mitigating friction during bending and protecting the inner optical fiber from damage. Simultaneously, the second and third braided layers sequentially arranged on the outer side of the first braided layer enhance the toughness of the composite braided layer, enabling it to withstand greater stress during bending, preventing excessive deformation or cracking, protecting the internal optical fiber and structure from damage, and ensuring the optical cable continues to function normally under bending conditions.

[0062] In summary, the anti-bending optical cable provided in this application, through the synergistic effect of the first braided layer, the second braided layer and the third braided layer in the composite braided layer, can endow the optical cable with excellent long-term anti-bending ability, effectively reduce the attenuation of the optical cable during bending, and has excellent transmission performance. At the same time, it also has the characteristics of bending resistance, tensile strength, good flexibility and lightweight, and is suitable for use as an optical cable in the vehicle field.

[0063] Those skilled in the art will readily understand that the above description is merely a preferred embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A vehicle-mounted anti-bending optical cable comprising, from inside to outside, an optical fiber (1), a composite braid layer (2) and a sheath (3), characterized in that, The composite braided layer (2) includes a first braided layer (21), a second braided layer (22) and a third braided layer (23) arranged sequentially from the inside to the outside. The first braided layer (21), the second braided layer (22) and the third braided layer (23) are all made of composite fiber filaments containing aramid fiber, carbon fiber and glass fiber; The mass percentages of aramid fiber, carbon fiber and glass fiber in the first braided layer (21) are 60%~70%, 0%~30% and 5%~10% respectively; the mass percentages of aramid fiber, carbon fiber and glass fiber in the second braided layer (22) are 5%~20%, 50%~60% and 10%~30% respectively; and the mass percentages of aramid fiber, carbon fiber and glass fiber in the third braided layer (23) are 0%~10%, 30%~40% and 50%~60% respectively.

2. The vehicle-mounted anti-bend optical cable according to claim 1, characterized in that, In the first braided layer (21), the second braided layer (22) and the third braided layer (23), the thickness difference between any two adjacent layers is less than 1 / 2 of the equivalent diameter of the optical fiber.

3. The vehicle-mounted kink-resistant optical cable of claim 1, wherein, The linear density of the aramid fiber is 100 dtex to 1610 dtex; and / or, The elastic modulus of the carbon fiber is 230 GPa to 390 GPa; and / or, The glass fiber has a breaking elongation of 3% to 6% and an elastic modulus of 40 GPa to 100 GPa; the glass fiber is a hydrophobic glass fiber.

4. The vehicle-mounted kink-resistant optical cable of claim 1, wherein, The optical fiber (1) is a single-mode optical fiber, multimode optical fiber, loose fiber, fiber ribbon, fiber ribbon array, or flexible fiber ribbon; and / or, The material of the sheath (3) is one or more of thermoplastic polyurethane, low-smoke halogen-free polyolefin, polyvinyl chloride, polyethylene, polytetrafluoroethylene, perfluoroethylene propylene, polyurethane, and polyamide.

5. A method of manufacturing the vehicle-mounted, kink-resistant optical cable according to any one of claims 1 to 4, characterized by, Includes the following steps: S1. The first composite fiber, the second composite fiber and the third composite fiber are mixed and braided on the outside of the optical fiber (1) in sequence to form a composite braided layer (2) with the first braided layer (21), the second braided layer (22) and the third braided layer (23) arranged from the inside to the outside. The first, second, and third composite fiber filaments all comprise aramid fibers, carbon fibers, and glass fibers; wherein, the mass percentages of aramid fibers, carbon fibers, and glass fibers in the first composite fiber filament are 60%~70%, 0%~30%, and 5%~10%, respectively; the mass percentages of aramid fibers, carbon fibers, and glass fibers in the second composite fiber filament are 5%~20%, 50%~60%, and 10%~30%, respectively; and the mass percentages of aramid fibers, carbon fibers, and glass fibers in the third composite fiber filament are 0%~10%, 30%~40%, and 50%~60%, respectively. S2. The sheath material is extruded on the outside of the composite braided layer (2) to form a sheath (3).

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