Electrically driven towing trailer special car cable

Abstract

The utility model discloses a kind of special automobile cable for electric towed house car, belong to cable technical field, including alternating current charging wire unit, signal transmission line unit and two direct current charging wire units and outer sheath;The alternating current charging wire unit, signal transmission line unit are arranged between two direct current charging wire units and are horizontally spaced distribution in parallel, the outer sheath covers the alternating current charging wire unit, signal transmission line unit and two direct current charging wire units and forms flat flat cable structure.This special automobile cable structure is reasonable, complete function, reliable protection, convenient to install and maintain, greatly optimize the connection mode between electric towed house car and towing vehicle, with good practical value and popularization prospect.

Description

Technical Field

[0001] This utility model belongs to the field of cable technology, and in particular relates to a special automotive cable for electric towed RVs. Background Technology

[0002] A towable motorhome is a type of RV that moves by being towed by a vehicle without needing its own power. It typically includes basic living facilities such as a bedroom, kitchen, and bathroom, meeting accommodation needs during travel while maintaining high flexibility and economy. Towable motorhomes come in various types, including light, medium, and large, depending on their size and layout, making them suitable for family trips, road trips, or long-distance camping. Once at the destination, users can detach the RV from the tow vehicle for independent use, enhancing the convenience and comfort of the trip.

[0003] Currently, towed motorhomes typically transmit DC power, AC power, video signals, and control signals via multiple independent dedicated cables. This wiring method is not only cumbersome and inconvenient to operate, but also suffers from messy cabling, large space occupation, and susceptibility to tangling and detachment, affecting the overall aesthetics and driving safety. Furthermore, the multi-wire separation structure leads to low system integration and poor compatibility; it's difficult to standardize cables and interfaces from different manufacturers, increasing the difficulty of equipment matching and upgrades. In addition, the exposed multiple cables offer poor protection and are susceptible to external factors such as rain, dust, ultraviolet radiation, and mechanical pulling, resulting in frequent signal interference and cable damage. Once a problem occurs, troubleshooting and maintenance require checking each cable individually, leading to low efficiency and a poor user experience. In view of these shortcomings, there is an urgent need to develop a compact, reliable, and functionally integrated towed motorhome-specific cable to achieve unified transmission of multiple functional signals, improve connection efficiency and operational safety, and meet the intelligent and integrated development needs of modern motorhome systems. Utility Model Content

[0004] In view of the problems of cumbersome connection between towed caravans and towing vehicles, large space occupation, poor compatibility, insufficient protection and maintenance difficulties in the existing technology, this utility model provides a special automotive cable for electric towed caravans.

[0005] This utility model is implemented as follows: a special automotive cable for electric towable RVs, characterized in that it includes an AC charging cable unit, a signal transmission cable unit, two DC charging cable units, and an outer sheath; the AC charging cable unit and the signal transmission cable unit are arranged between the two DC charging cable units and are distributed in parallel and laterally spaced apart; the outer sheath covers the AC charging cable unit, the signal transmission cable unit, and the two DC charging cable units and forms a flat cable structure.

[0006] In the above technical solution, preferably, the two DC charging cable units are symmetrically arranged on both sides of the outer sheath; the DC charging cable unit includes a fiber reinforcing core, a stranded conductor, an insulating protective layer, a shielding layer and an inner sheath layer arranged sequentially from the inside to the outside.

[0007] In the above technical solution, preferably, the outer conductors of the two stranded conductors of the DC charging line units are stranded in opposite directions.

[0008] In the above technical solution, preferably, the signal transmission line unit includes a control signal transmission line unit and a video signal transmission unit, wherein the video signal transmission unit is disposed between the AC charging line unit and the control signal transmission line unit and is located in the middle of the outer sheath.

[0009] This electric towable RV-specific automotive cable features an integrated design, combining DC charging cable units, AC charging cable units, and signal transmission cable units. Through unified routing and outer sheathing, it forms a flat cabling structure, achieving organic integration of multiple functions and significantly improving the cable's structural compactness and system integration. This structure makes cable laying simpler and operation more convenient, effectively avoiding problems such as tangling, loosening, and misconnection that exist in traditional multi-strand cable connections, thus improving the reliability and aesthetics of the RV system connection. Simultaneously, the cable adopts a symmetrical arrangement, with two DC charging cable units positioned on opposite sides of the cable. This ensures transmission functionality while achieving even weight distribution, improving the cable's stability and torsional resistance during towing and reducing the risk of cable damage due to uneven loading or bending. Furthermore, the integrated outer sheath not only enhances overall mechanical strength but also provides excellent waterproof, dustproof, abrasion-resistant, and UV-resistant capabilities, making it suitable for long-term use in complex outdoor environments and effectively extending its service life.

[0010] In summary, this special-purpose vehicle cable has a reasonable structure, complete functions, reliable protection, and is easy to install and maintain. It greatly optimizes the connection method between electric towed caravans and towing vehicles, and has good practical value and promotion prospects. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the cable pair described in this utility model;

[0012] Figure 2 This is a schematic diagram of the DC charging cable unit in the cable described in this utility model. Detailed Implementation

[0013] To make the objectives, technical solutions, and advantages of this utility model clearer, the following detailed description is provided in conjunction with embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this utility model.

[0014] To address the problems of cumbersome connection between towed RVs and towing vehicles, large space occupation, poor compatibility, insufficient protection, and difficult maintenance in existing technologies, this utility model provides a special automotive cable for electric towed RVs. To further illustrate the structure of this utility model, a detailed description is provided below in conjunction with the accompanying drawings:

[0015] Please see Figure 1 A special automotive cable for an electric towed RV includes an AC charging cable unit 2, a signal transmission cable unit, two DC charging cable units, and an outer sheath 6. The AC charging cable unit, signal transmission cable unit, and DC charging cable unit are dedicated core assemblies. In this embodiment, specifically, the signal transmission cable unit includes a control signal transmission cable unit 4 and a video signal transmission cable unit 3, and the two DC charging cable units are divided into a positive DC charging cable unit 1 and a negative DC charging cable unit 5. The DC charging cable unit is responsible for transmitting DC power generated by the generator of the towing vehicle or the solar panels of the trailer to the battery storage; the AC charging cable unit is responsible for transmitting AC power from an external charging station to the inverter; the video signal transmission unit and the control signal transmission cable unit are responsible for transmitting video and signal information between the towing vehicle and the trailer.

[0016] The AC charging cable unit, control signal transmission line unit, and video signal transmission unit are located between the two DC charging cable units, and all units are distributed horizontally and parallel to each other in the cross-section. Specifically, the video signal transmission unit is located between the AC charging cable unit and the control signal transmission unit.

[0017] The outer sheath covers two DC charging cable units, an AC charging cable unit, a video signal transmission unit, and a control signal transmission cable unit, forming a flat cabling structure. The two DC charging cable units are symmetrically arranged on both sides of the outer sheath, while the video signal transmission unit is located in the middle. The specific structures of the AC charging cable unit, video signal transmission unit, and control signal transmission cable unit can be selected from existing mature cable structures based on the actual electrical connection requirements, operating voltage level, signal type, and transmission bandwidth requirements between the tractor vehicle and the RV. This application does not impose any particular limitations on their specific structures.

[0018] The outer sheath can be made of UL94 V-0 flame-retardant cross-linked polyethylene, which improves both fire resistance and outdoor weather resistance. The flat structure allows for parallel arrangement of the conductors with clear hierarchical layers. Unlike round wires, it does not experience cross stress or internal twisting during repeated bending, making it more suitable for scenarios involving multiple bends or winding, such as the tangling-loosening conditions during RV towing. The flat structure has a larger surface area relative to its volume, and the conductors are closer to the outer layer, facilitating rapid heat radiation from the cable's interior, especially during high-current charging, thus helping to suppress overheating and aging. All wire units inside the outer sheath are covered by an independently designed inner sheath. The inner sheath is preferably made of a soft, wear-resistant, heat-resistant, and highly insulating material, such as thermoplastic polyurethane (TPU), low-smoke halogen-free polyolefin (LSZH), or modified polyvinyl chloride (PVC). This tightly wraps the conductors and creates a buffer space between them and the outer sheath, preventing the outer sheath from directly impacting the internal conductors under stress or bending, effectively enhancing its pressure and shock resistance. The above structural design not only improves the overall mechanical strength and environmental adaptability of the cable, but also facilitates standardized wiring and rapid installation and maintenance in subsequent production processes, and is especially suitable for the stable connection requirements of towed motorhomes under different operating conditions.

[0019] Please see Figure 2 The DC charging cable unit comprises, from the inside out, a fiber reinforcing core 1-1, a stranded conductor 1-2, an insulating protective layer 1-3, a shielding layer 1-4, and an inner sheath layer 1-5. The outer conductors of the stranded conductors in the two DC charging cable units are stranded in opposite directions. Specifically, the stranded conductor is fixed to the outer surface of the fiber reinforcing core. The stranded conductor is made of copper wire with a diameter ranging from 0.150mm to 0.200mm and 500-1500 strands. The DC charging cable unit is located on both sides of the overall cable, representing the positive and negative terminals respectively. Its conductivity is achieved by multiple strands of copper wire wound around the insulating fiber reinforcing core, symmetrically on both sides, with the outer copper wires stranded in opposite directions to counteract the internal rotation force. This technical solution uses a dedicated fiber reinforcing core, which can bear weight and also provides insulation. It can be stranded together with the conductor into an integrated structure, eliminating the need for separate placement. The ends of the fiber reinforcing core can be directly fixed to the vehicle body to support the weight of the cable. This cable features a fiber-reinforced core to increase its tensile strength, making it suitable for towing between two vehicles. It utilizes a reverse stranding method to eliminate internal stress in the stranded wires. The finely stranded conductors, with a stranding ratio of 6-7 times the diameter, reduce damage caused by cable swaying. Each core is shielded to prevent signal interference.

[0020] The insulating protective layer can be made of cross-linked polyolefin, with a rated withstand voltage of up to 1kV and a thickness of 2mm or more to meet high-voltage isolation requirements. The shielding layer adopts an aluminum foil + woven copper mesh structure, which also has a certain mechanical strength. The fiber reinforcing core can be made of aramid fiber, with a tensile strength of ≥1000N, ensuring that it is not easily broken under dragging or vibration.

[0021] Each wiring unit is equipped with a shielding layer, which not only effectively isolates electromagnetic interference between adjacent signal lines but also enhances the overall shielding performance. This design reduces electromagnetic field leakage from the cable, minimizes the risk of interference to surrounding electronic equipment, improves system electromagnetic compatibility, and thus enhances the safety and stability of the entire vehicle system.

[0022] The AC charging cable unit uses an existing known structure, consisting of a conductor, a conductor insulation layer, a shielding layer, and an inner sheath layer from the inside out; the video signal transmission unit includes a central conductor, an insulation layer, a shielding layer, and an inner sheath layer.

[0023] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A special automotive cable for electric towed RVs, characterized in that: It includes an AC charging cable unit, a signal transmission cable unit, two DC charging cable units, and an outer sheath; the AC charging cable unit and the signal transmission cable unit are arranged between the two DC charging cable units and are distributed in parallel and laterally spaced apart; the outer sheath covers the AC charging cable unit, the signal transmission cable unit, and the two DC charging cable units and forms a flat cable structure.

2. The electric towable RV-specific vehicle cable according to claim 1, characterized in that: Two DC charging cable units are symmetrically arranged on both sides of the outer sheath; each DC charging cable unit includes, from the inside out, a fiber reinforcing core, a stranded conductor, an insulating protective layer, a shielding layer, and an inner sheath layer.

3. The electric towable RV-specific vehicle cable according to claim 2, characterized in that: The outer conductors of the two DC charging cable units are twisted in opposite directions.

4. The electric towable RV-specific vehicle cable according to claim 3, characterized in that: The signal transmission line unit includes a control signal transmission line unit and a video signal transmission unit. The video signal transmission unit is located between the AC charging line unit and the control signal transmission line unit and is situated in the middle of the outer sheath.

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