High and low temperature resistant swing-resistant cable for connection of ABS wheel speed sensor

Abstract

The invention discloses a high and low temperature resistant swing-resistant cable for connection of an ABS wheel speed sensor, and belongs to the technical field of cables. The high and low temperature resistant and swing resistant cable for ABS wheel speed sensor connection comprises a light ABS wire harness, two power lines symmetrically arranged on the two sides of the light ABS wire harness and two third reinforcing units symmetrically arranged on the two sides of the light ABS wire harness, and the symmetry axis of the two third reinforcing units is perpendicular to the symmetry axis of the two power lines; an outer sheath layer is arranged outside the light ABS wire harness, the two power lines and the two third reinforcing units. A light filling layer is filled among the light ABS wire harness, the two power lines, the two third reinforcing units and the outer sheath layer; the light ABS wire harness comprises two insulating wire harnesses which are symmetrically arranged, a first insulating layer which wraps the insulating wire harnesses, and a fan-shaped filling layer which is filled between the two insulating wire harnesses and the first insulating layer. And a second reinforcing unit is arranged in each fan-shaped filling layer.

Description

TECHNICAL FIELD

[0001] The application relates to a high-low temperature resistant and swing resistant cable for ABS wheel speed sensor connection. BACKGROUND

[0002] As a core component of modern automobile active safety, the performance of the anti-lock braking system (ABS) is directly related to the braking effect and driving safety of the vehicle. The wheel speed sensor is a key sensing element of the ABS system, which is responsible for real-time monitoring of the rotational speed of each wheel and transmitting signals to the electronic control unit (ECU) to achieve precise brake pressure regulation. The signal connection between the wheel speed sensor and the ECU relies on a dedicated connection cable, and the performance stability of the cable is crucial to the reliable operation of the entire ABS system.

[0003] However, ABS wheel speed sensors face extremely harsh environmental challenges in actual work. Specifically, when the vehicle is driving, especially in the engine compartment or wheel suspension parts, the sensor cable not only needs to withstand the high temperature generated by engine heat, which can reach more than 125℃, but also needs to withstand the heat generated by the brake system friction. At the same time, in the winter of cold regions, the cable may be exposed to extremely cold environments below -40℃. Such drastic temperature fluctuations can accelerate the aging process of the ordinary cable insulation layer and sheath material, resulting in problems such as material hardening, cracking or loss of elasticity. The deterioration of these material properties not only damages the insulation performance of the cable, but also weakens its mechanical protection, which may eventually cause signal transmission failure or interference, and in severe cases, may even endanger the normal operation of the ABS system.

[0004] In addition, the vibration, jolt and swing of the wheels during driving will cause the connection cable to bear continuous and complex mechanical stress, especially the cable near the wheels, which will experience high-frequency and small-radius swing movement. Long-term swing fatigue can easily cause the internal conductor of the cable to break, the insulation layer to wear or delaminate, which can also cause signal failure. The existing part of the ABS wheel speed sensor connection cable has obvious deficiencies in high-low temperature resistance and dynamic swing resistance, and it is difficult to meet the stringent requirements of modern vehicles, especially new energy vehicles and high-performance vehicles, for high reliability and long-life wiring harness.

[0005] Therefore, it is urgent to develop a special ABS wheel speed sensor connection cable with excellent high-temperature resistance, low-temperature resistance and excellent swing resistance. SUMMARY

[0006] The purpose of the present application is to provide a high-low temperature resistant and swing resistant cable for ABS wheel speed sensor connection to solve the technical problems mentioned in the background.

[0007] The technical solution to achieve the purpose of the present application is:

[0008] This invention provides a high and low temperature resistant and swing-resistant cable for connecting ABS wheel speed sensors, comprising a lightweight ABS wire harness, power lines, a third reinforcing unit, a lightweight filler layer, and an outer sheath layer; at least two power lines are provided, arranged in a ring array around the lightweight ABS wire harness, and a third reinforcing unit is provided at equal intervals between two adjacent power lines; the lightweight filler layer fills the space between the outer sheath layer, the lightweight ABS wire harness, the power lines, and the third reinforcing unit.

[0009] This invention effectively improves the symmetry of the cable structure by arranging the power lines in a ring array around a lightweight ABS cable harness, making the stress on the cable more uniform during repeated bending and avoiding local stress concentration. Simultaneously, the equidistant placement of third reinforcing units between adjacent power lines not only enhances the overall tensile strength of the cable but also effectively suppresses radial deformation during swaying and acts as a "skeleton support" to maintain the stability of the cable's cross-sectional geometry. Furthermore, the lightweight filler layer filling the spaces between the outer sheath, the lightweight ABS cable harness, the power lines, and the third reinforcing units effectively eliminates internal gaps, preventing wear caused by relative sliding of components, while providing good buffering to absorb stress generated during bending and helping to reduce the overall weight of the cable, aligning with lightweight design trends. The synergistic effect of these structures significantly improves the sway resistance of the high and low temperature resistant and sway-resistant cable for connecting ABS wheel speed sensors.

[0010] Furthermore, the lightweight ABS wire harness includes an insulated wire harness, a first insulating layer, a fan-shaped filler layer, and a second reinforcing unit; at least two insulated wire harnesses are provided, and the at least two insulated wire harnesses are arranged symmetrically together close to each other. The first insulating layer covers the at least two insulated wire harnesses, the fan-shaped filler layer fills the space between the first insulating layer and the insulated wire harnesses, and the second reinforcing unit is provided within the fan-shaped filler layer.

[0011] The sector-shaped filling layer is made of polyurethane foam.

[0012] The lightweight ABS wire harness of the present invention includes insulated wire harnesses, a first insulating layer, a fan-shaped filler layer, and a second reinforcing unit. At least two insulated wire harnesses are provided, symmetrically arranged close together to form a compact structure, which is beneficial for improving signal transmission stability and reducing electromagnetic interference. The first insulating layer covers the exterior of multiple insulated wire harnesses, serving as overall insulation and structural fixation. A fan-shaped filler layer is filled between the first insulating layer and the insulated wire harnesses. Its cross-section is fan-shaped, effectively conforming to the wire harness contour, making full use of space, and enhancing the integrity of the internal structure. This fan-shaped filler layer is made of polyurethane foam. The material features low density, good elasticity, and excellent buffering performance, which not only significantly reduces the weight of the wire harness itself to meet the requirements of lightweighting, but also absorbs dynamic stress during repeated bending or swaying of the cable, reducing friction and impact between the insulated wire harness and the external structure, thereby improving the sway resistance. In addition, a second reinforcing unit is embedded inside the fan-shaped filling layer as a local reinforcement structure, which further improves the tensile strength and deformation resistance of the lightweight ABS wire harness. Together with the elastic support of polyurethane foam, it forms "flexibility + reinforcement", which significantly improves the mechanical durability of the overall cable under complex dynamic working conditions.

[0013] Furthermore, the insulated wire harness includes a first reinforcing unit, a plurality of stranded conductor units arranged in an array around the first reinforcing unit, and an insulating sheath layer covering the stranded conductor units.

[0014] Furthermore, the stranded conductor unit is obtained by stranding copper wires using a 1+6 type co-directional stranding method.

[0015] The insulated wire harness of the present invention includes a first reinforcing unit, a plurality of stranded conductor units arranged in an array around the first reinforcing unit, and an insulating sheath layer covering the stranded conductor units. The stranded conductor units are formed by stranding copper wires using a 1+6 type co-directional stranding method. The first reinforcing unit is located at the center and serves as the core load-bearing structure, enhancing the overall tensile strength and bending resistance of the wire harness. The plurality of stranded conductor units are arranged in an array around the first reinforcing unit and are formed by tightly stranding the copper wires using a 1+6 type co-directional stranding method. This 1+6 type stranding structure consists of a central copper wire surrounded by six outer copper wires evenly stranded, with all copper wires stranded in the same direction. Compared to the traditional interleaved stranding method, this significantly reduces the relative slippage and internal stress between the copper wires, resulting in better resistance during repeated bending or swaying. It effectively resists fatigue fracture; at the same time, the unidirectional stranded structure makes the conductor more flexible overall, with uniform deformation during bending, avoiding local stress concentration, thereby improving the conductor's durability under dynamic conditions; the outer insulating sheath not only provides electrical insulation protection, but also fixes the stranded structure and prevents the conductor from loosening during use; in addition, the first reinforcing unit in the center bears the main tensile stress when the cable swings, reducing the stress on the conductor unit and delaying the metal fatigue process; through the synergistic design of central reinforcement, unidirectional stranded conductor and insulating sheath, this insulated cable bundle significantly enhances the overall flexibility, structural stability and resistance to repeated bending of the cable while ensuring good conductivity, thereby effectively improving the long-term reliability and swing resistance of the ABS wheel speed sensor cable in complex vibration and swing environments.

[0016] Furthermore, the outer sheath layer comprises, by weight parts, 20-25 parts silicone rubber, 50-60 parts lightweight polyurethane elastomer, 1-2 parts sulfur, 1-2 parts lubricant, 2-5 parts antioxidant, and 1-2 parts antistatic agent.

[0017] Furthermore, the preparation steps of the outer sheath layer are as follows:

[0018] S1. Under nitrogen protection, 50-60 parts by weight of light polyurethane elastomer (after removing oxygen and moisture), 2-3 parts by weight of zinc powder, and 200-400 parts by weight of glacial acetic acid are mixed, refluxed for 3-5 hours, filtered, washed with deionized water until neutral, and dried.

[0019] S2. Mix 20-25 parts by weight of silicone rubber and the lightweight polyurethane elastomer treated in step S1 on a two-roll mill at 20°C for 15 min. Then add 1-2 parts by weight of sulfur and 1-2 parts by weight of lubricant, mix well, and vulcanize at 150-160°C for 7-14 min. Then, melt-blend with 2-5 parts by weight of antioxidant and 1-2 parts by weight of antistatic agent in a twin-screw extruder and extrude on the outside of the lightweight filler layer to obtain the outer sheath layer.

[0020] Furthermore, the silicone rubber is methyl vinyl silicone rubber.

[0021] Furthermore, the lightweight polyurethane elastomer is obtained by a composite reaction of flame-retardant silica aerogel and polyurethane prepolymer, and the specific steps are as follows:

[0022] A1. Under nitrogen protection, add 150-160 parts by weight of diisocyanate monomer to 100 parts by weight of polyester diol after removing oxygen and moisture at 50-60℃, heat to 78-82℃ and react at a constant temperature for 1.5-2.5h, then degas under vacuum for at least 30min to obtain polyurethane prepolymer.

[0023] A2. Cool the polyurethane prepolymer to 50-60°C, add 4-6 parts by weight of flame-retardant silica aerogel, mix and stir evenly, then add 5-10 parts by weight of 3,3'-dihydroxydiphenyl disulfide and 20-25 parts by weight of 1,4-butanediol that have been preheated and melted, raise the temperature to 80-85°C, add 0.5-1 parts by weight of dibutyltin dilaurate, and cure at 115-125°C for 19-21 hours to obtain a lightweight polyurethane elastomer.

[0024] Furthermore, the flame-retardant silica aerogel is obtained by vacuum-assisted impregnation and gelation of silica aerogel in resorcinol-furfural sol, followed by flame-retardant modification with a flame retardant agent. The specific steps are as follows:

[0025] B1. Mix deionized water, acetic acid, hexadecyltrimethylammonium bromide, and urea, and stir evenly at room temperature. Then add methyltrimethoxysilane and stir for 10–20 min. Next, add dimethyldimethoxysilane and continue stirring until the solution is clear and transparent. Then transfer to a sealed container and gel age in an oven at 75–85 °C for 47–49 h to obtain a wet gel. Wash the wet gel with a 1:1 volume ratio of ethanol and isopropanol, and dry under normal pressure to obtain silica aerogel. The molar ratio of deionized water, acetic acid, hexadecyltrimethylammonium bromide, urea, methyltrimethoxysilane, and dimethyldimethoxysilane is 110:3–3.5:0.4–0.6:12:2.6–3:2–2.4.

[0026] B2. Dissolve hexamethylenetetramine in isopropanol and resorcinol in furfural. Then mix and stir the two solutions to obtain resorcinol-furfural sol, wherein the molar ratio of resorcinol to furfural is 1:2, the mass-to-volume ratio of resorcinol to isopropanol is 0.08–0.18 g / mL, and the mass-to-volume ratio of hexamethylenetetramine to isopropanol is 0.01 g / mL.

[0027] B3. Completely immerse the silica aerogel in resorcinol-furfural sol, and use vacuum assistance to evenly distribute the resorcinol-furfural sol within the silica aerogel. Then, place it in a constant temperature drying oven at 65-75℃ for a gelation reaction for 2-4 hours. Next, add 0.11-0.16 times the mass of the silica aerogel as flame retardant, and continue the reaction for 1-3 hours. After drying with anhydrous ethanol 4-6 times, dry under normal pressure, pulverize, grind, and sieve to obtain flame-retardant silica aerogel.

[0028] The flame retardant includes diphenylphosphoric acid and 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide.

[0029] By adopting the above technical solution, the present invention has the following beneficial effects:

[0030] (1) By arranging the power lines in a ring array around the lightweight ABS wire harness, the symmetry of the cable structure is effectively improved, making the cable more uniformly stressed during repeated bending and avoiding local stress concentration. At the same time, the third reinforcing unit is set at equal intervals between adjacent power lines, which not only enhances the overall tensile strength of the cable, but also effectively suppresses its radial deformation during swaying and serves as a "skeleton support" to maintain the stability of the cable cross-sectional geometry. In addition, the lightweight filler layer between the outer sheath, the lightweight ABS wire harness, the power lines and the third reinforcing unit can fully eliminate internal gaps, prevent wear caused by relative sliding of components, provide good buffering to absorb the stress generated during bending, and help reduce the overall weight of the cable, which is in line with the trend of lightweight design. The above-mentioned structural synergy significantly improves the sway resistance of the high and low temperature resistant and sway-resistant cable for connecting ABS wheel speed sensors.

[0031] (2) The lightweight ABS wire harness of the present invention includes an insulated wire harness, a first insulating layer, a fan-shaped filler layer, and a second reinforcing unit; at least two insulated wire harnesses are provided, and the at least two insulated wire harnesses are arranged symmetrically together to form a compact structure, which is beneficial to improving the stability of signal transmission and reducing electromagnetic interference; the first insulating layer covers the outside of multiple insulated wire harnesses, playing the role of overall insulation and structural fixation; a fan-shaped filler layer is filled between the first insulating layer and the insulated wire harnesses, and its cross-section is designed in a fan shape, which can effectively fit the wire harness outline, make full use of space, and enhance the integrity of the internal structure; the fan-shaped filler layer is made of polyurethane foam. The foam material, characterized by low density, good elasticity, and excellent cushioning performance, not only significantly reduces the weight of the wire harness itself, meeting the requirements for lightweighting, but also absorbs dynamic stress during repeated bending or swaying of the cable, reducing friction and impact between the insulated wire harness and the external structure, thereby improving sway resistance. In addition, a second reinforcing unit is embedded inside the fan-shaped filling layer as a local reinforcement structure, further improving the tensile strength and deformation resistance of the lightweight ABS wire harness. Together with the elastic support of the polyurethane foam, it forms a "flexible + reinforced" structure, significantly improving the overall mechanical durability of the cable under complex dynamic conditions.

[0032] (3) The insulated wire harness of the present invention includes a first reinforcing unit, a plurality of stranded conductor units arranged in an array around the first reinforcing unit, and an insulating sheath layer covering the stranded conductor units; the stranded conductor units are obtained by stranding copper wires in a 1+6 type co-directional stranding method; wherein, the first reinforcing unit is located at the center position, serving as the core load-bearing structure, and playing a role in enhancing the overall tensile strength and bending resistance of the wire harness; the plurality of stranded conductor units are arranged in an array around the first reinforcing unit, and the copper wires are tightly stranded in a 1+6 type co-directional stranding method; the 1+6 type stranding structure consists of a central copper wire surrounded by six outer copper wires evenly stranded, and all copper wires are stranded in the same direction. Compared with the traditional interleaved stranding method, it can significantly reduce the relative slippage and internal stress between copper wires, and is more resistant to repeated bending or swaying. It effectively resists fatigue fracture; at the same time, the unidirectional stranded structure makes the conductor more flexible overall, with uniform deformation during bending, avoiding local stress concentration, thereby improving the conductor's durability under dynamic conditions; the outer insulating sheath not only provides electrical insulation protection, but also fixes the stranded structure and prevents the conductor from loosening during use; in addition, the first reinforcing unit in the center bears the main tensile stress when the cable swings, reducing the stress on the conductor unit and delaying the metal fatigue process; through the synergistic design of central reinforcement, unidirectional stranded conductor and insulating sheath, this insulated cable harness significantly enhances the overall flexibility, structural stability and resistance to repeated bending of the cable while ensuring good conductivity, thereby effectively improving the long-term reliability and swing resistance of the ABS wheel speed sensor cable in complex vibration and swing environments.

[0033] (4) The raw material components of the outer sheath layer of the present invention include silicone rubber, lightweight polyurethane elastomer, sulfur, lubricant, antioxidant, and antistatic agent; wherein, the silicone rubber is methyl vinyl silicone rubber; the lightweight polyurethane elastomer is obtained by composite reaction of flame-retardant silica aerogel and polyurethane prepolymer; the flame-retardant silica aerogel is obtained by vacuum-assisted impregnation and gelation reaction of silica aerogel in resorcinol-furfural sol and then flame-retardant modification with flame retardant agent; the flame retardant includes diphenyl phosphoric acid and 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide, and the outer sheath layer obtained has good high and low temperature resistance and flexibility.

[0034] (5) The lightweight polyurethane elastomer of the present invention is prepared by a composite reaction of flame-retardant silica aerogel, polyurethane prepolymer, 3,3'-dihydroxydiphenyl disulfide, and 1,4-butanediol. The flame-retardant silica aerogel, as a functional nanofiller, has extremely low density and high specific surface area, which not only endows the elastomer with excellent lightweight properties, but its unique porous network structure can also effectively hinder heat transfer, significantly improving the thermal insulation performance and flame retardancy of the material. Simultaneously, the surface of the flame-retardant silica aerogel is rich in hydroxyl groups, which can chemically react with the polyurethane prepolymer to achieve grafting, enhancing the interfacial compatibility between the filler and the matrix. This makes the composite material less prone to interfacial debonding during repeated bending or temperature cycling, helping to maintain the stability of the overall structure. The polyurethane prepolymer, as a continuous matrix resin, undergoes cross-linking under the action of the chain extender 1,4-butanediol. The reaction forms a polymer structure that combines linear segments and cross-linked networks, thus endowing the material with good mechanical strength and elastic recovery. In addition, 3,3'-dihydroxydiphenyl disulfide is introduced as a functional chain extender. Its molecular structure contains both rigid benzene rings and flexible disulfide bonds. It can not only participate in the chain extension reaction and embed itself into the polyurethane backbone through the terminal hydroxyl groups, but also enhance the interaction forces between molecular chains by utilizing the benzene ring, thereby improving the material's heat resistance and stability. At the same time, this structure is conducive to the formation of a dense char layer under high temperature conditions, and produces a synergistic flame retardant effect with flame-retardant silica aerogel, effectively improving the high and low temperature resistance, flexibility, and flame retardancy of lightweight polyurethane elastomers.

[0035] (6) The flame-retardant silica aerogel of the present invention is obtained by preparing silica aerogel using methyltrimethoxysilane and dimethyldiethoxysilane as precursors, and then by vacuum-assisted impregnation and gelation reaction in resorcinol-furfural sol and flame-retardant modification with flame retardant agent; wherein, due to the presence of methyl groups, the silica skeleton exhibits higher local degrees of freedom, reduces cross-linking points, and promotes the formation of more linear Si-O-Si bonds, rather than a rigid ring structure. This is similar to the "flexible segments" in polymers, which endows the material with macroscopic deformation ability and forms a loose three-dimensional network structure with high porosity. This high porosity not only provides compression space, allowing the aerogel to absorb energy through pore collapse, but its open structure also allows gas to escape, avoiding brittle fracture and thus enhancing the flexibility and resilience of the flame-retardant silica aerogel. The impregnation and gelation process of resorcinol-furfural sol forms an interpenetrating network with the silica aerogel in its three-dimensional network structure, strengthening the Si-OC bond connection, improving the material's compressive strength and elastic modulus, while maintaining its flexibility. In addition, the phosphate groups in the flame retardant can undergo esterification with the phenolic hydroxyl groups in the resorcinol-furfural silica aerogel to form stable phosphate ester bonds, ensuring that the flame retardant is firmly bound to the aerogel network and preventing migration or leakage. Under high-temperature conditions, the silica framework provides a physical barrier and a high-temperature resistant inorganic network; phenolic resin enhances char formation ability, forming a protective char layer; and diphenylphosphine plays an efficient role in the synergistic flame retardancy of the gas phase and condensed phase. The synergistic effect of these three factors significantly improves the overall flame-retardant performance of the flame-retardant silica aerogel.

[0036] (7) In the preparation of the outer sheath layer of the present invention, the lightweight polyurethane elastomer is first mixed with zinc powder and glacial acetic acid for pretreatment, and then melt-blended with silicone rubber for vulcanization and extrusion. In the pretreatment stage, the zinc powder reacts in the acidic environment provided by glacial acetic acid and releases active hydrogen. This reducing environment causes the disulfide bonds in the molecular chain of the lightweight polyurethane elastomer to break and be reduced, generating highly reactive thiol groups. These in-situ generated thiol groups can react with the unsaturated olefin bonds on the molecular chain of silicone rubber under vulcanization conditions during the subsequent blending process with silicone rubber to form stable sulfur-carbon bonds or thioether bonds, thereby achieving chemical bonding between the two polymers and effectively improving the interfacial compatibility between the lightweight polyurethane elastomer and silicone rubber. At the same time, the mobility of the polyurethane chain segments after thiolization is enhanced, and the embrittlement temperature of the composite material is effectively reduced after blending with silicone rubber, effectively enhancing the flexibility, low temperature resistance and mechanical properties of the outer sheath layer. Attached Figure Description

[0037] To make the content of this invention easier to understand, the invention will be further described in detail below with reference to specific embodiments and accompanying drawings, wherein...

[0038] Figure 1 This is a schematic diagram of the structure of a high and low temperature resistant and swing-resistant cable for connecting an ABS wheel speed sensor according to an embodiment of the present invention.

[0039] The labels in the attached diagram are as follows: Lightweight ABS wire harness 1, First reinforcing unit 1-1, Stranded conductor unit 1-2, Insulating sheath layer 1-3, Second reinforcing unit 1-4, Fan-shaped filler layer 1-5, First insulation layer 1-6, Power cord 2, Third reinforcing unit 3, Lightweight filler layer 4, Outer sheath layer 5. Detailed Implementation

[0040] To better understand the above technical solutions, the following will provide a detailed explanation of the technical solutions in conjunction with the accompanying drawings and specific implementation methods.

[0041] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0042] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0043] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0044] In the description of the embodiments of the present invention, it should be understood that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of the invention is in use, or the orientation or positional relationship commonly understood by those skilled in the art. They are only used to facilitate the description of the present invention and to simplify the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention.

[0045] In the description of the embodiments of the present invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in the present invention based on the specific circumstances. The present invention will be further described below with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solutions of the present invention and should not be used to limit the scope of protection of the present invention.

[0046] The isocyanate monomer is diphenylmethane diisocyanate.

[0047] The antioxidant used is antioxidant 1010.

[0048] Polyester polyol 218 has an average molecular weight of 2000 and a hydroxyl value of 56 mgKOH / g.

[0049] The lubricant used is glyceryl stearate.

[0050] Example 1

[0051] See Figure 1 A high- and low-temperature resistant and swing-resistant cable for connecting ABS wheel speed sensors includes a lightweight ABS wire harness 1, a power cord 2, a third reinforcing unit 3, a lightweight filler layer 4, and an outer sheath layer 5. Two power cords 2 are provided, symmetrically arranged around the lightweight ABS wire harness 1. Two third reinforcing units 3 are symmetrically arranged on both sides of the lightweight ABS wire harness 1 between two adjacent power cords 2, with the axis of symmetry of the third reinforcing unit 3 perpendicular to the axis of symmetry of the power cord 2. The lightweight filler layer 4 fills the space between the outer sheath layer 5, the lightweight ABS wire harness 1, the power cord 2, and the third reinforcing unit 3.

[0052] The lightweight ABS wire harness 1 includes an insulated wire harness, a first insulation layer 1-6, a fan-shaped filler layer 1-5, and a second reinforcing unit 1-4. There are two insulated wire harnesses, which are arranged symmetrically together close to each other. The first insulation layer 1-6 covers the two insulated wire harnesses. The fan-shaped filler layer 1-5 fills the space between the first insulation layer 1-6 and the insulated wire harnesses. The second reinforcing unit 1-4 is provided inside the fan-shaped filler layer 1-5.

[0053] The insulated wire harness includes a first reinforcing unit 1-1, four stranded conductor units 1-2 arranged in an array around the first reinforcing unit 1-1, and an insulating sheath layer 1-3 covering the stranded conductor units 1-2; the stranded conductor unit is formed by stranding seven copper wire conductors with a single wire diameter of 0.15mm in a 1+6 type co-directional stranding method.

[0054] The third reinforcing unit 3, the second reinforcing unit 1-4, and the first reinforcing unit 1-1 all use 1000D aramid fiber.

[0055] Lightweight filler layer 4 and fan-shaped filler layers 1-5 are all made of polyurethane foam.

[0056] The preparation steps of the outer sheath layer 5 are as follows:

[0057] S1. Weigh and mix the ingredients: 20 parts by weight of silicone rubber, 50 parts by weight of lightweight polyurethane elastomer, 1 part by weight of sulfur, 1 part by weight of lubricant, 2 parts by weight of antioxidant, and 1 part by weight of antistatic agent.

[0058] S2. Under nitrogen protection, mix the oxygen- and moisture-free lightweight polyurethane elastomer weighed in S1, 2 parts by weight of zinc powder, and 200 parts by weight of glacial acetic acid, reflux for 3 hours, filter, wash with deionized water until neutral, and dry.

[0059] S3. Mix the silicone rubber and the lightweight polyurethane elastomer treated in step S2 on a two-roll mill at 20°C for 15 min. Then add sulfur and lubricant, mix well, and vulcanize at 150°C for 14 min. Then melt-blend with antioxidant and antistatic agent in a twin-screw extruder and extrude on the outside of the lightweight filler layer 4 to obtain the outer sheath layer 5.

[0060] The silicone rubber used is methyl vinyl silicone rubber.

[0061] The specific preparation steps of the lightweight polyurethane elastomer are as follows:

[0062] A1. Under nitrogen protection, 150 parts by mass of diisocyanate monomer were added to 100 parts by mass of polyester diol after oxygen and moisture were removed at 50℃. The mixture was heated to 78℃ and reacted at a constant temperature for 1.5 hours. Then, it was degassed under vacuum for 30 minutes to obtain polyurethane prepolymer.

[0063] A2. Cool the polyurethane prepolymer to 50°C, add 4 parts by weight of flame-retardant silica aerogel, mix thoroughly, then add 5 parts by weight of pre-melted 3,3'-dihydroxydiphenyl disulfide and 25 parts by weight of 1,4-butanediol. Raise the temperature to 80°C, add 0.5 parts by weight of dibutyltin dilaurate, and cure at 115°C for 19 hours to obtain a density of 1.12 g / cm³. 3 Lightweight polyurethane elastomer.

[0064] The specific preparation steps for the flame-retardant silica aerogel are as follows:

[0065] B1. Deionized water, acetic acid, hexadecyltrimethylammonium bromide, and urea were mixed and stirred evenly at room temperature. Then, methyltrimethoxysilane was added and stirred for 10 min. Dimethyldimethoxysilane was then added and stirring was continued until the solution was clear and transparent. The solution was then transferred to a sealed container and aged in a 75°C oven for 47 h to obtain a wet gel. The wet gel was then washed with a 1:1 volume ratio of ethanol and isopropanol and dried under normal pressure to obtain silica aerogel. The molar ratio of deionized water, acetic acid, hexadecyltrimethylammonium bromide, urea, methyltrimethoxysilane, and dimethyldimethoxysilane was 110:3:0.4:12:2.6:2.

[0066] B2. Dissolve hexamethylenetetramine in isopropanol and resorcinol in furfural. Then mix and stir the two solutions to obtain resorcinol-furfural sol, wherein the molar ratio of resorcinol to furfural is 1:2, the mass-to-volume ratio of resorcinol to isopropanol is 0.08 g / mL, and the mass-to-volume ratio of hexamethylenetetramine to isopropanol is 0.01 g / mL.

[0067] B3. The silica aerogel was completely immersed in resorcinol-furfural sol. Vacuum assistance was used to evenly distribute the resorcinol-furfural sol within the silica aerogel. Then, the aerogel was placed in a 65°C constant temperature drying oven for 2 hours for gelation. Then, 0.11 times the mass of the silica aerogel was added with diphenylphosphoric acid, and the reaction was continued for 1 hour. The aerogel was dried with anhydrous ethanol 4 times, dried under normal pressure, pulverized, ground, and sieved to obtain flame-retardant silica aerogel with a particle size of 10 μm.

[0068] Example 2

[0069] Example 2 and Example 1 share the same structure for an ABS wheel speed sensor connection cable resistant to high and low temperatures and swaying, except that the preparation steps of the outer sheath layer 5 are as follows:

[0070] S1. Weigh and mix the ingredients: 23 parts by weight of silicone rubber, 55 parts by weight of lightweight polyurethane elastomer, 1.5 parts by weight of sulfur, 1.5 parts by weight of lubricant, 3.5 parts by weight of antioxidant, and 1.5 parts by weight of antistatic agent;

[0071] S2. Under nitrogen protection, mix the oxygen- and moisture-free lightweight polyurethane elastomer weighed in S1, 2.7 parts by weight of zinc powder, and 300 parts by weight of glacial acetic acid, reflux for 4 hours, filter, wash with deionized water until neutral, and dry.

[0072] S3. Mix the silicone rubber and the lightweight polyurethane elastomer treated in step S2 on a two-roll mill at 20°C for 15 min. Then add sulfur and lubricant, mix well, and vulcanize at 155°C for 10 min. Then melt-blend with antioxidant and antistatic agent in a twin-screw extruder and extrude on the outside of the lightweight filler layer 4 to obtain the outer sheath layer 5.

[0073] The silicone rubber used is methyl vinyl silicone rubber.

[0074] The specific preparation steps of the lightweight polyurethane elastomer are as follows:

[0075] A1. Under nitrogen protection, 155 parts by mass of diisocyanate monomer were added to 100 parts by mass of polyester diol after oxygen and moisture were removed at 55℃. The mixture was heated to 80℃ and reacted at a constant temperature for 2 hours. Then, it was degassed under vacuum for 30 minutes to obtain polyurethane prepolymer.

[0076] A2. Cool the polyurethane prepolymer to 55°C, add 5 parts by weight of flame-retardant silica aerogel, mix thoroughly, then add 8 parts by weight of pre-melted 3,3'-dihydroxydiphenyl disulfide and 22 parts by weight of 1,4-butanediol. Raise the temperature to 80°C, add 0.8 parts by weight of dibutyltin dilaurate, and cure at 120°C for 20 hours to obtain a density of 1.10 g / cm³. 3 Lightweight polyurethane elastomer.

[0077] The specific preparation steps for the flame-retardant silica aerogel are as follows:

[0078] B1. Deionized water, acetic acid, hexadecyltrimethylammonium bromide, and urea were mixed and stirred evenly at room temperature. Then, methyltrimethoxysilane was added and stirred for 15 minutes. Dimethyldimethoxysilane was then added and stirring was continued until the solution was clear and transparent. The solution was then transferred to a sealed container and aged in an oven at 80°C for 48 hours to obtain a wet gel. The wet gel was then washed with a mixture of ethanol and isopropanol in a volume ratio of 1:1 and dried under normal pressure to obtain silica aerogel. The molar ratio of deionized water, acetic acid, hexadecyltrimethylammonium bromide, urea, methyltrimethoxysilane, and dimethyldimethoxysilane was 110:3.5:0.5:12:2.8:2.2.

[0079] B2. Dissolve hexamethylenetetramine in isopropanol and resorcinol in furfural. Then mix and stir the two solutions to obtain resorcinol-furfural sol, wherein the molar ratio of resorcinol to furfural is 1:2, the mass-to-volume ratio of resorcinol to isopropanol is 0.13 g / mL, and the mass-to-volume ratio of hexamethylenetetramine to isopropanol is 0.01 g / mL.

[0080] B3. The silica aerogel was completely immersed in resorcinol-furfural sol. Vacuum assistance was used to evenly distribute the resorcinol-furfural sol within the silica aerogel. The aerogel was then placed in a 70°C constant temperature drying oven for a gelation reaction for 3 hours. Then, 0.14 times the mass of the silica aerogel was added with diphenylphosphoric acid, and the reaction was continued for 2 hours. The aerogel was dried with anhydrous ethanol 5 times, dried under normal pressure, pulverized, ground, and sieved to obtain a flame-retardant silica aerogel with a particle size of 10 μm.

[0081] Example 3

[0082] Example 3 and Example 1 share the same structure for an ABS wheel speed sensor connection cable resistant to high and low temperatures and swaying, except that the preparation steps for the outer sheath layer 5 are as follows:

[0083] S1. Weighing and mixing ingredients: 25 parts by weight of silicone rubber, 60 parts by weight of lightweight polyurethane elastomer, 2 parts by weight of sulfur, 2 parts by weight of lubricant, 5 parts by weight of antioxidant, and 2 parts by weight of antistatic agent.

[0084] S2. Under nitrogen protection, mix the oxygen- and moisture-free lightweight polyurethane elastomer weighed in S1, 3 parts by weight of zinc powder, and 400 parts by weight of glacial acetic acid, reflux for 5 hours, filter, wash with deionized water until neutral, and dry.

[0085] S3. Mix the silicone rubber and the lightweight polyurethane elastomer treated in step S2 on a two-roll mill at 20°C for 15 minutes. Then add sulfur and lubricant, mix well, and vulcanize at 160°C for 7 minutes. Then melt-blend with antioxidant and antistatic agent in a twin-screw extruder and extrude on the outside of the lightweight filler layer 4 to obtain the outer sheath layer 5.

[0086] The silicone rubber used is methyl vinyl silicone rubber.

[0087] The specific preparation steps of the lightweight polyurethane elastomer are as follows:

[0088] A1. Under nitrogen protection, 160 parts by mass of diisocyanate monomer were added to 100 parts by mass of polyester diol after oxygen and moisture were removed at 60℃. The mixture was heated to 82℃ and reacted at a constant temperature for 2.5 hours. Then, it was degassed under vacuum for 30 minutes to obtain polyurethane prepolymer.

[0089] A2. Cool the polyurethane prepolymer to 60°C, add 6 parts by weight of flame-retardant silica aerogel, mix thoroughly, then add 10 parts by weight of pre-melted 3,3'-dihydroxydiphenyl disulfide and 20 parts by weight of 1,4-butanediol. Raise the temperature to 85°C, add 1 part by weight of dibutyltin dilaurate, and cure at 125°C for 21 hours to obtain a density of 1.10 g / cm³. 3 Lightweight polyurethane elastomer.

[0090] The specific preparation steps for the flame-retardant silica aerogel are as follows:

[0091] B1. Deionized water, acetic acid, hexadecyltrimethylammonium bromide, and urea were mixed and stirred evenly at room temperature. Then, methyltrimethoxysilane was added and stirred for 20 min. Dimethyldimethoxysilane was then added and stirring was continued until the solution was clear and transparent. The solution was then transferred to a sealed container and aged in an oven at 85°C for 49 h to obtain a wet gel. The wet gel was then washed with a mixture of ethanol and isopropanol in a volume ratio of 1:1 and dried under normal pressure to obtain silica aerogel. The molar ratio of deionized water, acetic acid, hexadecyltrimethylammonium bromide, urea, methyltrimethoxysilane, and dimethyldimethoxysilane was 110:3.5:0.6:12:3:2.4.

[0092] B2. Dissolve hexamethylenetetramine in isopropanol and resorcinol in furfural. Then mix and stir the two solutions to obtain resorcinol-furfural sol, wherein the molar ratio of resorcinol to furfural is 1:2, the mass-to-volume ratio of resorcinol to isopropanol is 0.18 g / mL, and the mass-to-volume ratio of hexamethylenetetramine to isopropanol is 0.01 g / mL.

[0093] B3. The silica aerogel was completely immersed in resorcinol-furfural sol. Vacuum assistance was used to evenly distribute the resorcinol-furfural sol within the silica aerogel. Then, the aerogel was placed in a constant temperature drying oven at 75°C for 4 hours for gelation. Then, 0.16 times the mass of the silica aerogel was added with diphenylphosphoric acid, and the reaction was continued for 3 hours. The aerogel was dried with anhydrous ethanol 6 times, dried under normal pressure, pulverized, ground, and sieved to obtain flame-retardant silica aerogel with a particle size of 10 μm.

[0094] Comparative Example 1

[0095] The difference between Comparative Example 1 and Example 2 is that the lightweight polyurethane elastomer is prepared by a composite reaction of silica aerogel, polyurethane prepolymer, 3,3'-dihydroxydiphenyl disulfide, and 1,4-butanediol. Specifically, the silica aerogel is prepared using methyltrimethoxysilane and dimethyldiethoxysilane as precursors. The specific steps are as follows: deionized water, acetic acid, hexadecyltrimethylammonium bromide, and urea are mixed and stirred evenly at room temperature. Then, methyltrimethoxysilane is added and stirred for 15 minutes, followed by the addition of dimethyldiethoxysilane. The silane was stirred until the solution became clear and transparent. Then, it was transferred to a sealed container and aged in an oven at 80°C for 48 hours to obtain a wet gel. The wet gel was then washed with a mixture of ethanol and isopropanol in a volume ratio of 1:1 and dried under normal pressure to obtain a silica aerogel. The molar ratio of deionized water, acetic acid, hexadecyltrimethylammonium bromide, urea, methyltrimethoxysilane, and dimethyldimethoxysilane was 110:3.5:0.5:12:2.8:2.2. The remaining structure, steps, and components were the same as in Example 2.

[0096] Comparative Example 2

[0097] The difference between Comparative Example 2 and Example 2 is that the lightweight polyurethane elastomer is prepared by a composite reaction of flame-retardant silica aerogel, polyurethane prepolymer, and 1,4-butanediol. The remaining structure, steps, and components are the same as in Example 2.

[0098] Comparative Example 3

[0099] The difference between Comparative Example 3 and Example 2 is that the lightweight polyurethane elastomer is prepared by a composite reaction of flame-retardant silica aerogel, polyurethane prepolymer, and 1,4-butanediol. The preparation steps of the flame-retardant silica aerogel are as follows:

[0100] B1. Deionized water, acetic acid, hexadecyltrimethylammonium bromide, and urea are mixed and stirred evenly at room temperature. Then, tetramethoxysilane is added and stirring is continued until the solution is clear and transparent. The solution is then transferred to a sealed container and aged in an oven at 80°C for 48 hours to obtain a wet gel. The wet gel is then washed with a mixture of ethanol and isopropanol in a volume ratio of 1:1 and dried under normal pressure to obtain silica aerogel. The molar ratio of deionized water, acetic acid, hexadecyltrimethylammonium bromide, urea, and tetramethoxysilane is 110:3.5:0.5:12:5.

[0101] B2. Dissolve hexamethylenetetramine in isopropanol and resorcinol in furfural. Then mix and stir the two solutions to obtain resorcinol-furfural sol, wherein the molar ratio of resorcinol to furfural is 1:2, the mass-to-volume ratio of resorcinol to isopropanol is 0.13 g / mL, and the mass-to-volume ratio of hexamethylenetetramine to isopropanol is 0.01 g / mL.

[0102] B3. The silica aerogel was completely immersed in resorcinol-furfural sol. Vacuum assistance was used to evenly distribute the resorcinol-furfural sol within the silica aerogel. The aerogel was then placed in a 70°C constant temperature drying oven for a gelation reaction for 3 hours. Then, 0.14 times the mass of the silica aerogel was added with diphenylphosphoric acid, and the reaction was continued for 2 hours. The aerogel was dried with anhydrous ethanol 5 times, dried under normal pressure, pulverized, ground, and sieved to obtain a flame-retardant silica aerogel with a particle size of 10 μm.

[0103] Comparative Example 4

[0104] The difference between Comparative Example 4 and Example 2 is that the outer sheath layer 5 is prepared by directly melting and vulcanizing lightweight polyurethane elastomer and silicone rubber. The rest of the structure, steps and composition are the same as in Example 2.

[0105] Example of effect

[0106] Swing resistance test conditions: load 75N, bending radius R120mm, ±90°, 30 times / min, length 600mm, record the number of swings.

[0107] High temperature resistance test: The outer sheaths of Examples 1-3 and Comparative Examples 1-3 were placed in an oven at 180℃ for 1000 hours, referring to the outer sheath GB / T39560.3-2021, and the retention rates of insulation tensile strength and elongation at break were tested before and after aging.

[0108] Table 1 below shows the performance test results of the high and low temperature resistant and swing-resistant cables and outer sheaths used for connecting ABS wheel speed sensors in Examples 1-3 and Comparative Examples 1-3 of the present invention:

[0109] Table 1

[0110]

[0111]

[0112] As shown in Table 1 above, the ABS wheel speed sensor connection cables of Examples 1 to 3 have good sway resistance, good flame retardancy, good high and low temperature resistance, and good mechanical properties. After aging at 180°C for 1000 hours, the retention rate of insulation tensile strength is still as high as 85%, and the retention rate of elongation at break is still as high as 80%, indicating good high temperature resistance. Moreover, the number of sway cycles at room temperature is as high as 6 million, and the number of sway cycles at -60°C is still as high as 1 million, indicating good sway resistance and low temperature resistance.

[0113] The difference between Comparative Example 1 and Example 2 is that the lightweight polyurethane elastomer is prepared by a composite reaction of silica aerogel, polyurethane prepolymer, 3,3'-dihydroxydiphenyl disulfide, and 1,4-butanediol. The silica aerogel is prepared by using methyltrimethoxysilane and dimethyldiethoxysilane as precursors. It is not vacuum-assisted impregnation and gelation in resorcinol-furfural sol, and is not modified with flame retardant after the reaction. The resulting ABS wheel speed sensor connection cable with low temperature and high sway resistance has weak sway resistance, and the flame retardancy, high and low temperature resistance, and mechanical properties of the outer sheath are also weak.

[0114] The difference between Comparative Example 2 and Example 2 is that the lightweight polyurethane elastomer is prepared by a composite reaction of flame-retardant silica aerogel, polyurethane prepolymer, and 1,4-butanediol. The resulting ABS wheel speed sensor connection cable with low temperature and high sway resistance has weak sway resistance, and the outer sheath layer has weak high and low temperature resistance and mechanical properties.

[0115] The difference between Comparative Example 3 and Example 2 is that the flame-retardant silica aerogel is obtained by preparing silica aerogel using tetramethoxysilane as a precursor, and then vacuum-assisted impregnation and gelation reaction in resorcinol-furfural sol, followed by flame-retardant modification with a flame retardant agent. The resulting ABS wheel speed sensor connection cable with good high and low temperature resistance and sway resistance has better sway resistance, but the low temperature resistance and mechanical properties of the outer sheath are weaker.

[0116] The difference between Comparative Example 4 and Example 2 is that the outer sheath layer 5 is prepared by directly melting, blending, vulcanizing and extruding lightweight polyurethane elastomer and silicone rubber. The resulting ABS wheel speed sensor connection cable with low temperature and high temperature resistance and sway resistance has weak sway resistance, and the outer sheath layer has weak low temperature resistance and mechanical properties.

[0117] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of the present invention. It should be understood that the above descriptions are merely specific embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A high and low temperature resistant and sway-resistant cable for connecting ABS wheel speed sensors, characterized in that, It includes a lightweight ABS wire harness (1), a power cord (2), a third reinforcing unit (3), a lightweight filler layer (4), and an outer sheath layer (5); at least two power cords (2) are provided, and at least two power cords (2) are arranged in a ring array around the lightweight ABS wire harness (1), and the third reinforcing unit (3) is provided at equal intervals between two adjacent power cords (2); the lightweight filler layer (4) fills the space between the outer sheath layer (5), the lightweight ABS wire harness (1), the power cord (2), and the third reinforcing unit (3).

2. The high and low temperature resistant and sway-resistant cable for connecting ABS wheel speed sensors according to claim 1, characterized in that, The lightweight ABS wire harness (1) includes an insulated wire harness, a first insulation layer (1-6), a fan-shaped filler layer (1-5), and a second reinforcing unit (1-4); at least two insulated wire harnesses are provided, and at least two insulated wire harnesses are arranged symmetrically together close to each other. The first insulation layer (1-6) covers the at least two insulated wire harnesses, and the fan-shaped filler layer (1-5) fills the space between the first insulation layer (1-6) and the insulated wire harnesses. The second reinforcing unit (1-4) is provided inside the fan-shaped filler layer (1-5).

3. The high and low temperature resistant and sway-resistant cable for connecting ABS wheel speed sensors according to claim 2, characterized in that, The insulated wire harness includes a first reinforcing unit (1-1), a plurality of stranded conductor units (1-2) arranged in an array around the first reinforcing unit (1-1), and an insulating sheath layer (1-3) covering the stranded conductor units (1-2).

4. The high and low temperature resistant and sway-resistant cable for connecting ABS wheel speed sensors according to claim 3, characterized in that, The stranded conductor unit (1-2) is obtained by stranding copper wires using a 1+6 type co-directional stranding method.

5. The high and low temperature resistant and sway-resistant cable for connecting ABS wheel speed sensors according to claim 1, characterized in that, The outer sheath layer (5) comprises the following raw material components by mass: 20-25 parts silicone rubber, 50-60 parts lightweight polyurethane elastomer, 1-2 parts sulfur, 1-2 parts lubricant, 2-5 parts antioxidant, and 1-2 parts antistatic agent.

6. The high and low temperature resistant and sway-resistant cable for connecting ABS wheel speed sensors according to claim 5, characterized in that, The preparation steps of the outer sheath layer (5) are as follows: S1. Weigh and mix each raw material component; S2. Under nitrogen protection, a lightweight polyurethane elastomer that has been deoxygenated and dehydrated, 2-3 parts by weight of zinc powder, and 200-400 parts by weight of glacial acetic acid are mixed, refluxed for 3-5 hours, filtered, washed with deionized water until neutral, and dried. S2. Mix the silicone rubber and the lightweight polyurethane elastomer treated in step S1 on a two-roll mill at 20°C for 15 min. Then add sulfur and lubricant and mix well. Vulcanize at 150-160°C for 7-14 min. Then melt-blend with antioxidant and antistatic agent in a twin-screw extruder and extrude on the outside of the lightweight filler layer to obtain the outer sheath layer.

7. The high and low temperature resistant and sway-resistant cable for connecting ABS wheel speed sensors according to claim 6, characterized in that, The silicone rubber used is methyl vinyl silicone rubber.

8. The high and low temperature resistant and sway-resistant cable for connecting ABS wheel speed sensors according to claim 5, characterized in that, The specific preparation steps of the lightweight polyurethane elastomer are as follows: A1. Under nitrogen protection, add 150-160 parts by weight of diisocyanate monomer to 100 parts by weight of polyester diol after removing oxygen and moisture at 50-60℃, heat to 78-82℃ and react at a constant temperature for 1.5-2.5h, then degas under vacuum for at least 30min to obtain polyurethane prepolymer. A2. Cool the polyurethane prepolymer to 50-60°C, add 4-6 parts by weight of flame-retardant silica aerogel, mix and stir evenly, then add 5-10 parts by weight of 3,3'-dihydroxydiphenyl disulfide and 20-25 parts by weight of 1,4-butanediol that have been preheated and melted, raise the temperature to 80-85°C, add 0.5-1 parts by weight of dibutyltin dilaurate, and cure at 115-125°C for 19-21 hours to obtain a lightweight polyurethane elastomer.

9. The high and low temperature resistant and sway-resistant cable for connecting ABS wheel speed sensors according to claim 8, characterized in that, The specific preparation steps for the flame-retardant silica aerogel are as follows: B1. Mix deionized water, acetic acid, hexadecyltrimethylammonium bromide, and urea, and stir evenly at room temperature. Then add methyltrimethoxysilane and stir for 10–20 min. Next, add dimethyldimethoxysilane and continue stirring until the solution is clear and transparent. Then transfer to a sealed container and gel age in an oven at 75–85 °C for 47–49 h to obtain a wet gel. Wash the wet gel with a 1:1 volume ratio of ethanol and isopropanol, and dry under normal pressure to obtain silica aerogel. The molar ratio of deionized water, acetic acid, hexadecyltrimethylammonium bromide, urea, methyltrimethoxysilane, and dimethyldimethoxysilane is 110:3–3.5:0.4–0.6:12:2.6–3:2–2.

4. B2. Dissolve hexamethylenetetramine in isopropanol and resorcinol in furfural. Then mix and stir the two solutions to obtain resorcinol-furfural sol, wherein the molar ratio of resorcinol to furfural is 1:2, the mass-to-volume ratio of resorcinol to isopropanol is 0.08–0.18 g / mL, and the mass-to-volume ratio of hexamethylenetetramine to isopropanol is 0.01 g / mL. B3. Completely immerse the silica aerogel in resorcinol-furfural sol, and use vacuum assistance to evenly distribute the resorcinol-furfural sol within the silica aerogel. Then, place it in a constant temperature drying oven at 65-75℃ for a gelation reaction for 2-4 hours. Next, add 0.11-0.16 times the mass of the silica aerogel as flame retardant, and continue the reaction for 1-3 hours. After drying with anhydrous ethanol 4-6 times, dry under normal pressure, pulverize, grind, and sieve to obtain flame-retardant silica aerogel.

10. The high and low temperature resistant and sway-resistant cable for connecting ABS wheel speed sensors according to claim 9, characterized in that, The flame retardant includes diphenylphosphoric acid and 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide.

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