Trailer power take-off arrangement, frame and vehicle

Abstract

The application provides a trailer power taking port device, a vehicle frame and a vehicle, and belongs to the technical field of vehicle structures. The trailer power taking port device comprises: a first mounting arm arranged on a trailer hook fixing support; a second mounting arm rotatably connected to the first mounting arm and used for mounting a trailer power taking port connector; and a rotation stroke limiter arranged at the rotatable connection position of the first mounting arm and the second mounting arm. In a non-use state, the trailer power taking port connector rotates with the second mounting arm to a hidden position and is embedded in the inner side of the bumper. In a use state, the trailer power taking port connector rotates with the second mounting arm to a revealed position, facilitating external trailer power connection. Through cooperation of the rotatable double-arm structure and the stroke limiter, the trailer power taking port connector is hidden in the inner side of the bumper in a non-use state and is conveniently revealed in a use state, effectively balancing protection, aesthetics and operation convenience.

Description

Technical Field

[0001] This application belongs to the field of vehicle structure technology, specifically relating to a trailer power take-off device, a frame, and a vehicle. Background Technology

[0002] In vehicle towing applications, the trailer power connector is used to provide power to the trailer's lighting, braking, or electronic equipment, and is an important electrical interface to ensure driving safety.

[0003] Currently, most vehicles on the market use a fixed, exposed installation for their trailer power supply ports, which are directly located on the rear bumper surface or near the tow hook. While this design is simple in structure and low in cost, it has revealed many problems in actual use.

[0004] Because the power input port is constantly exposed to the elements, it is highly susceptible to environmental factors such as rain, dust, and mud, which can lead to oxidation of the internal terminals, short circuits, and even electrical failure. Furthermore, during daily driving, car washing, or parking, the exposed connector is also prone to mechanical damage such as bumps and scratches, affecting its lifespan and connection reliability. In addition, the protruding structure disrupts the overall aesthetics of the vehicle body and may increase wind resistance. Utility Model Content

[0005] In order to solve at least one of the technical problems existing in the background art, this application provides a trailer power outlet device, which, through a rotatable double-arm structure and a travel limiter, allows the trailer power outlet connector to be hidden inside the bumper when not in use and conveniently exposed when in use, effectively balancing protection, aesthetics and ease of operation.

[0006] A second aspect of this application provides a vehicle frame.

[0007] A third aspect of this application provides a vehicle.

[0008] The technical solution adopted in this application is as follows: The first aspect of this application provides a trailer power take-off device, comprising: The first mounting arm is mounted on the trailer hook mounting bracket; The second mounting arm is rotatably connected to the first mounting arm and is used to install the trailer power supply connector. A rotational travel limiter is provided at the rotational connection between the first mounting arm and the second mounting arm; In the non-use state, the trailer power port connector rotates with the second mounting arm to a hidden position and is embedded inside the bumper. In the use state, the trailer power port connector rotates with the second mounting arm to a visible position, facilitating connection to an external trailer power source.

[0009] According to the trailer power outlet device provided in the first aspect of this application, a first mounting arm is fixed to the vehicle's existing trailer hitch mounting bracket to achieve stable support for the device. A second mounting arm is rotatably connected to the first mounting arm and is used to carry the trailer power outlet connector. A rotational travel limiter is provided at the rotatable connection point to precisely control the rotation range of the second mounting arm. When the device is not in use, the user can rotate the second mounting arm inward to embed the trailer power outlet connector entirely into the inner side of the front and rear bumpers for concealment. When connecting to an external trailer power source, the second mounting arm is rotated outward to a preset exposed position, exposing the connector for insertion. This structure fully utilizes the vehicle's existing mounting points (trailer hitch mounting bracket), eliminating the need for additional openings or changes to the vehicle's main structure. Simultaneously, mechanical limiting ensures the connector remains stable and reliable in both working positions (concealed position and used position), preventing wobbling. Based on the synergistic effect of the above components, the device effectively solves the problem that traditional exposed power outlets are susceptible to rain, dust intrusion, and impact damage. While improving the safety and durability of electrical connections, it also improves the overall appearance and aerodynamic performance of the vehicle. Furthermore, the simple and intuitive rotation operation enhances user convenience, combining practicality, reliability, and aesthetics.

[0010] According to one embodiment of this application, the rotational stroke limiter includes a first rotating ring and a second rotating ring that rotate and engage with each other; The first swivel is disposed on the first mounting arm, and the second swivel is disposed on the second mounting arm.

[0011] By employing a first rotating ring and a second rotating ring that rotate and interlock with each other as rotational travel limiters, with the first rotating ring fixed to the first mounting arm and the second rotating ring fixed to the second mounting arm, a stable and reliable rotational connection between the two mounting arms is achieved, and a structural basis is provided for precise control of the rotation angle. This rotating ring design combines load-bearing, centering, and limiting functions, is easy to assemble, moves smoothly, and has good durability. At the same time, it can effectively prevent dust and moisture from entering the rotation gap, significantly improving the operational stability, environmental adaptability, and long-term reliability of the device.

[0012] According to one embodiment of this application, a rotation limiting stop is formed on one of the first rotating ring and the second rotating ring, and a rotation groove is formed on the other. The rotation limit stop is slidably embedded in the rotation groove.

[0013] By setting a rotation limit stop on one of the first and second rotating rings and creating a rotation groove on the other, with the stop slidingly embedded in the groove, a compact and reliable mechanical limiting mechanism is constructed. When the second mounting arm rotates, the limit stop slides along the groove trajectory and is stopped at the end of the groove, thereby precisely limiting the start and end positions of the rotation stroke. This ensures that the trailer power connector can be stably stopped without shaking in both the concealed and exposed positions. This mating method avoids the use of elastic components such as springs and clips that are prone to aging or failure, improving the limiting accuracy and long-term durability. At the same time, it simplifies the assembly process and enhances the overall reliability and operation feel of the device.

[0014] According to one embodiment of this application, the rotation limit stop is provided with at least two points, and the rotation slide is provided with at least two sections.

[0015] By setting at least two rotation limit stops and at least two rotational slides, a multi-point collaborative limiting structure is formed, significantly improving the stability and reliability of rotational positioning. Multiple stops are synchronously embedded in their corresponding slide segments. When the second mounting arm rotates to its limit position (such as the hidden or exposed position), each stop abuts against the end of the slide, achieving multi-point stopping and effectively preventing swaying, rebound, or over-rotation caused by vehicle vibration, external impact, or operational inertia. Simultaneously, multi-point force distribution disperses contact stress, reducing the risk of localized wear, extending the lifespan of the limiting mechanism, and enhancing the user's sense of "positioning" and accuracy. Furthermore, this design offers excellent angle adaptability, allowing adjustment of the slide arc length and orientation to meet the rotational requirements of different vehicle models within the range of 90° to 145°, balancing versatility, durability, and ergonomics.

[0016] According to one embodiment of this application, the first swivel and the second swivel are bolted together.

[0017] By using bolts to fasten the first and second swivel rings together, not only is reliable axial fixation and coaxial stability during rotation ensured, but assembly, disassembly, and subsequent maintenance are also facilitated. Adjusting the bolt preload allows for precise control of the clamping degree between the swivel rings, preventing excessive gaps that could cause looseness and noise, while also preventing over-tightening that could increase rotational resistance, thus balancing smooth operation with structural rigidity. Furthermore, the bolted connection enhances the overall strength of the rotating parts, enabling them to effectively resist vehicle vibrations, towing loads, and mechanical shocks from frequent operation, significantly improving the device's durability, safety, and engineering practicality.

[0018] According to one embodiment of this application, the second mounting arm is provided with a handle or paddle structure for the user to apply force to drive the second mounting arm to rotate relative to the first mounting arm.

[0019] A handle or lever structure is provided on the second mounting arm, offering users a clear and convenient point of leverage, significantly improving the human-machine interface experience. Compared to directly gripping the small, smooth power connector body, the dedicated handle or lever is more ergonomic, allowing users to easily apply force to complete the rotation even in confined spaces such as the bumper cavity, while wearing gloves, or in wet and slippery conditions. Simultaneously, this structure integrates a positioning feedback function (such as a slight "click"), enhancing the confirmation of position switching and preventing the connector from being incompletely exposed or concealed due to improper operation. Overall, this detailed design significantly improves ease of use, safety, and intuitiveness without increasing complexity.

[0020] According to one embodiment of this application, the trailer power take-off connector is electrically connected to the vehicle power system via a wiring harness, the wiring harness having a flexible telescopic section or redundant length to accommodate displacement changes of the second mounting arm during rotation.

[0021] By incorporating flexible telescopic sections or reserving redundant lengths in the wiring harness, the dynamic displacement problem arising from the rotation of the trailer power take-off connector with the second mounting arm is effectively solved. During rotation, the position and angle of the connector continuously change. If the wiring harness is rigidly fixed or insufficient in length, repeated pulling and bending can easily cause fatigue fracture of the wires, poor contact, or even short circuits. Flexible telescopic structures (such as helical spring wires, corrugated tubing sections, or "U-shaped / Ω-shaped" bending allowances) can freely expand, contract, and deform, fully absorbing the mechanical stress brought about by movement and ensuring that the electrical connection remains continuous and reliable.

[0022] According to one embodiment of this application, the rotation angle of the second mounting arm is 90° to 145°.

[0023] Limiting the rotation angle of the second mounting arm to between 90° and 145° is a design based on full consideration of vehicle structural space, ease of operation, and concealment integrity. This angle range not only meets the differentiated requirements of bumper designs for different vehicle models, but also, in conjunction with the rotation travel limiter, ensures that the device can be stably parked without wobbling in both the concealed and operational positions. It balances functionality, safety, aesthetics, and engineering adaptability, demonstrating good versatility and practicality.

[0024] A second aspect of this application provides a vehicle frame, including: a trailer hitch fixing bracket and a trailer power outlet device as described in any of the first aspects embodiments, wherein a first mounting arm of the trailer power outlet device is fixed to the trailer hitch fixing bracket.

[0025] A third aspect of this application provides a vehicle, including: a trailer power take-off device as described in any of the embodiments of the first aspect, or a vehicle frame as described in the embodiments of the second aspect. Attached Figure Description

[0026] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings: Figure 1 This is a schematic diagram of the installation structure of the trailer power take-up device provided in an embodiment of this application; Figure 2 A schematic diagram of the structure of the first mounting arm provided in an embodiment of this application; Figure 3 This is a schematic diagram of the structure of the second mounting arm provided in an embodiment of this application.

[0027] in, 11. First mounting arm; 12. Second mounting arm; 121. Handle; 13. Rotational travel limiter; 131. First rotating ring; 1311. Rotational limit stop; 132. Second rotating ring; 1321. Rotational slide; 21. Trailer hook fixing bracket; 31. Trailer power connector; 311. Wiring harness. Detailed Implementation

[0028] To more clearly illustrate the overall concept of this application, a detailed explanation is provided below with reference to the accompanying drawings.

[0029] Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application may also be implemented in other ways different from those described herein. Therefore, the scope of protection of this application is not limited to the specific embodiments disclosed below. It should be noted that, unless otherwise specified, the embodiments of this application and the features thereof can be combined with each other.

[0030] Furthermore, it should be understood in the description of this application that the terms "top", "bottom", "inner", "outer", "axial", "radial", "circumferential", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0031] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a communication connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0032] In this application, unless otherwise expressly specified and limited, the "above" or "below" of the second feature can mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. In the description of this specification, references to terms such as "an embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described can be combined in any suitable manner in one or more embodiments or examples.

[0033] like Figures 1 to 3 As shown, a first aspect of this application provides a trailer power take-off device, comprising: The first mounting arm 11 is mounted on the trailer hook fixing bracket 21; The second mounting arm 12 is rotatably connected to the first mounting arm 11 and is used to mount the trailer power take-off connector 31. A rotational travel limiter 13 is provided at the rotational connection between the first mounting arm 11 and the second mounting arm 12; In the non-use state, the trailer power port connector 31 rotates with the second mounting arm 12 to a hidden position and is embedded inside the bumper. In the use state, the trailer power port connector 31 rotates with the second mounting arm 12 to a visible position, which facilitates connection to an external trailer power source.

[0034] The first mounting arm 11 serves as the fixed base for the entire device, directly mounted on the vehicle's existing trailer hitch mounting bracket 21, typically through bolts, clips, or welding to achieve a rigid connection. Its function is to provide a stable pivot point for the second mounting arm 12 and to firmly integrate the entire device into the vehicle frame structure without requiring additional modifications to the vehicle's bumper or chassis.

[0035] The second mounting arm 12 forms a rotating pair (i.e., a rotating connection) with the first mounting arm 11, and can rotate relative to each other around the connecting axis. This arm is used to support and fix the trailer power port connector 31, and is the core moving component for realizing the connector position switching. Under user operation, the second mounting arm 12 can reciprocate between the hidden position and the exposed position, thereby driving the power port connector to complete the retraction or exposure action.

[0036] A rotational travel limiter 13 is located at the rotational connection between the first mounting arm 11 and the second mounting arm 12 to limit the rotational angle range of the second mounting arm 12, preventing excessive rotation that could cause structural damage or connector misalignment. This limiter typically consists of cooperating limit stops and grooves, a cam structure, or a rotating ring assembly, ensuring clear positioning and stability of the device in both the "hidden position" and "exposed position" key states, preventing accidental displacement due to vibration or external forces during use.

[0037] The second mounting arm 12 serves as a motion actuator, forming a hinged joint with the first mounting arm 11 via a rotation axis. Its material can be die-cast aluminum alloy or engineering plastics (such as PA66+GF30), balancing lightweight design and structural strength. This arm not only supports the power connector body but also withstands user operating forces and the tensile force of the wiring harness 311; therefore, its cross-section is often designed as a U-shape or a closed cavity structure to improve bending stiffness.

[0038] The trailer power connector 31, mounted at the end of the second mounting arm 12, is an electrical interface for connecting to an external trailer power cord, used to transmit vehicle power (such as 12V / 24V) to the trailer. It moves synchronously with the second mounting arm 12, and when not in use, it is retracted inside the bumper, effectively avoiding the risks of water ingress, dust accumulation, and impacts caused by exposure. When needed, it rotates to the exposed position for quick and safe connection.

[0039] According to the first aspect of the embodiment of this application, the trailer power port device is stably supported by fixing the first mounting arm 11 to the existing trailer hook fixing bracket 21 of the vehicle; the second mounting arm 12 is rotatably connected to the first mounting arm 11 and is used to carry the trailer power port connector 31; a rotational stroke limiter 13 is provided at the rotatable connection between the two to precisely control the rotation range of the second mounting arm 12. When the device is not in use, the user can rotate the second mounting arm 12 inward so that the trailer power port connector 31 is embedded into the inside of the front and rear bumpers for concealment; when it is necessary to connect to an external trailer power source, the second mounting arm 12 is rotated outward to a preset exposed position so that the connector is exposed for insertion. This structure makes full use of the existing mounting points of the vehicle (trailer hook fixing bracket 21), without the need for additional holes or changes to the main body structure of the vehicle body, and at the same time, the mechanical limiter ensures that the connector is stable and reliable in two working positions (concealed position and used position) without shaking. Based on the synergistic effect of the above components, the device effectively solves the problem that traditional exposed power outlets are susceptible to rain, dust intrusion, and impact damage. While improving the safety and durability of electrical connections, it also improves the overall appearance and aerodynamic performance of the vehicle. Furthermore, the simple and intuitive rotation operation enhances user convenience, combining practicality, reliability, and aesthetics.

[0040] like Figures 2 to 3 As shown, in some embodiments of this application, the rotational stroke limiter 13 includes a first rotating ring 131 and a second rotating ring 132 that rotate and engage with each other; The first rotating ring 131 is disposed on the first mounting arm 11, and the second rotating ring 132 is disposed on the second mounting arm 12.

[0041] The interlocking relationship between the two rotating rings achieves a stable rotational connection between the first mounting arm 11 and the second mounting arm 12, and provides a structural basis for precise control of the rotation angle. In practical use, the two rotating rings not only transmit loads and maintain structural alignment, but can also integrate a limiting function—for example, a rotational limiting stop 1311 is set on one of the rotating rings, and a corresponding rotational groove 1321 is opened on the other rotating ring, allowing the stop to slide within the groove and be constrained by the end of the groove, thereby effectively limiting the rotational stroke of the second mounting arm 12. This rotating ring-type limiting structure has the advantages of simple assembly, smooth movement, and good durability, avoiding the easily worn and failed limiting methods such as traditional spring clips or elastic pins.

[0042] Meanwhile, since the rotating ring is completely covered at the rotating connection, it can also prevent dust and moisture from entering the rotating gap to a certain extent, thus improving the environmental adaptability and long-term reliability of the device.

[0043] In summary, the rotational travel limiter 13 not only ensures the precise positioning and stable stopping of the trailer power connector 31 between the concealed and exposed positions, but also enhances the overall operating feel and service life of the device.

[0044] like Figures 2 to 3 As shown, in some embodiments of this application, at least two rotation limit stops 1311 are provided, and at least two sections are provided for the rotation slide 1321.

[0045] The multi-point, multi-segment cooperative structure significantly improves the stability and reliability of the rotation stroke limit. During actual rotation, multiple limit stops are synchronously embedded in their respective corresponding slide sections and slide along the slide track. When the second mounting arm 12 rotates to the preset limit position (such as the fully concealed position or the fully exposed position), each stop abuts against the end of the corresponding slide section, forming a multi-point cooperative stop, effectively preventing the second mounting arm 12 from shaking, rebounding, or over-rotating due to vehicle vibration, external impact, or operating inertia.

[0046] Compared to a single-point, single-groove structure, the layout of multiple stops and multiple grooves not only disperses contact stress and reduces the risk of local wear, extending the service life of the limiting mechanism, but also enhances the user's sense of "position" and positioning accuracy during operation, thus improving the user experience.

[0047] Furthermore, this structure can flexibly adapt to different rotation angle requirements (such as 90°, 120°, or 145°). Precise settings for various working positions can be achieved simply by adjusting the arc length and orientation of the slide section, improving the device's versatility and design freedom. Therefore, this multi-stop, multi-slide limiting scheme ensures functional reliability while also considering durability, operability, and structural scalability.

[0048] For example, two stop points are symmetrically distributed, corresponding to the extreme positions of the concealed and active positions, respectively; two slides are arranged at intervals along the circumference, with each arc length precisely corresponding to the required rotation angle (e.g., 120°). When the second mounting arm 12 rotates, the stop points slide along the slides and are stopped at the ends, forming a clear "click" positioning feel. The multi-point design not only disperses contact stress and reduces the wear rate of a single point, but also allows another stop point to continue to perform the limiting function when one stop point is slightly deformed due to aging, improving redundancy and safety. In addition, the ends of the slides can be designed with small chamfers or elastic buffer zones to avoid abnormal noises caused by hard metal collisions and improve NVH performance.

[0049] In some embodiments of this application, the first rotating ring 131 and the second rotating ring 132 are bolted together. This not only ensures reliable axial fastening of the two rotating rings but also guarantees a stable coaxial fit during relative rotation. The bolted connection structure offers advantages such as easy assembly, strong connection, and detachable maintenance, facilitating modular assembly on the production line and simplifying later maintenance or component replacement. Furthermore, by adjusting the bolt preload, the tightness between the first rotating ring 131 and the second rotating ring 132 can be effectively controlled, preventing excessive clearance that could lead to loose rotation, abnormal noise, or inaccurate positioning, while also preventing excessive tightening that could increase rotational resistance and affect operational smoothness. In addition, the bolted connection enhances the structural rigidity of the entire rotating connection, improving the durability and reliability of the device under complex operating conditions such as vehicle vibration and towing loads. In summary, the bolted connection method ensures functional stability while also considering manufacturing convenience, user experience, and long-term service performance.

[0050] like Figure 3 As shown, in some embodiments of this application, the second mounting arm 12 is provided with a handle 121 or a lever structure for the user to apply force to drive the second mounting arm 12 to rotate relative to the first mounting arm 11.

[0051] The second mounting arm 12 is provided with a handle 121 or a lever structure, the main function of which is to provide the user with an easy-to-grip or force-apply operating part, thereby easily driving the second mounting arm 12 to rotate around the first mounting arm 11, realizing the switching of the trailer power port connector 31 between the hidden position and the exposed position.

[0052] The handle 121 or paddle structure is typically located on the outer edge of the second mounting arm 12 or in a position easily accessible to the fingers. Its shape conforms to ergonomic design, providing users with good operating leverage and tactile feedback in confined spaces (such as the bumper cavity). Compared to directly pulling the small or smooth-surfaced power connector body, the dedicated handle or paddle significantly reduces the difficulty of operation and avoids inconvenience or even component damage caused by slippage, uneven force, or space constraints.

[0053] In addition, the structure can also integrate limit indication functions, such as producing a slight "click" when rotated into position, enhancing the user's perception of the position status.

[0054] Overall, the handle section 121 or the lever structure enhances the device's ergonomics and ease of daily use.

[0055] The handle 121 or paddle mechanism is integrated into the outer edge of the second mounting arm 12. This component can be coated with soft rubber (TPE / TPU) to enhance tactile feel and grip, and its shape conforms to the natural grip curve of the fingers, allowing for easy application of force even when wearing gloves or in rainy weather. The paddle design is more suitable for space-constrained scenarios, allowing users to initiate rotation with just a flick of their fingertip, avoiding the need to insert their palm into narrow bumper cavities. In some embodiments, the handle can also be linked to a limit release mechanism—for example, slightly lifting the handle can release pre-tension friction, making rotation lighter and achieving a "touch-and-go" advanced operating experience.

[0056] like Figure 1 As shown, in some embodiments of this application, the trailer power connector 31 is electrically connected to the vehicle power system via a wiring harness 311, which has a flexible telescopic section or redundant length to accommodate the displacement changes of the second mounting arm 12 during rotation.

[0057] The trailer power connector 31 is electrically connected to the vehicle's power system via a wiring harness 311. To ensure the continuity and reliability of the electrical connection during operation, the wiring harness 311 is specially designed with a flexible telescopic section or a reserved redundant length. When the second mounting arm 12 rotates relative to the first mounting arm 11, the trailer power connector 31 will change position and angle accordingly. If the wiring harness 311 is rigidly fixed or insufficient in length, it is very easy to cause internal wire breakage, poor contact, or even short circuit due to excessive pulling or bending. By introducing a flexible telescopic structure (such as corrugated wiring or spring helical section) or reasonably reserving sufficient cable length, the wiring harness 311 can freely extend, retract, and bend without constraint during the reciprocating rotation of the second mounting arm 12, effectively absorbing displacement and deformation and avoiding mechanical stress concentration.

[0058] This not only ensures the stability and safety of power transmission, but also significantly improves the durability and service life of the entire device. At the same time, the reasonable wiring harness layout can reduce assembly interference, facilitate vehicle wiring integration, and balance functionality, safety, and manufacturability.

[0059] The flexible section can use helical spring wire or corrugated tubing to wrap the cable, or incorporate "U-shaped" or "Ω-shaped" bending allowances in the path of wire harness 311. This allows wire harness 311 to freely extend and retract during the rotation of the second mounting arm 12, with a maximum displacement of 50mm–80mm, far exceeding actual requirements. Simultaneously, a waterproof rubber sleeve and stress-relieving clip are added to the exit point of wire harness 311 to prevent fatigue breakage of the wires due to repeated bending. The connector body also adopts an IP67 or higher protection rating, combined with a fully enclosed environment in concealed mode, achieving dual waterproof and dustproof protection.

[0060] In some embodiments of this application, the rotation angle of the second mounting arm 12 is between 90° and 145°. An upper limit of 145° effectively prevents interference between the connector or the second mounting arm 12 and the inner wall of the bumper, exhaust pipe, spare tire, or other chassis components during rotation, while ensuring that it can be fully rotated and embedded inside the bumper when not in use, achieving a good concealment effect.

[0061] This angle range balances functionality, safety, and structural compactness, meeting the practical needs of everyday towing scenarios while adapting to the diverse rear designs of different vehicle models, demonstrating excellent versatility and engineering adaptability. Furthermore, combined with the precise control of the rotation stroke limiter 13, this rotation angle range ensures the device remains stably stationary at its two extreme positions (hidden and operational), preventing positioning failure or operational inconvenience due to excessively large or small angles, thereby improving the overall user experience and product reliability.

[0062] The rotation trajectory of the second mounting arm 12 must strictly match the geometric envelope of the bumper's inner cavity—too small and it cannot be completely hidden, too large and it may interfere with the exhaust pipe, spare tire, or sensor wiring harness 311. Therefore, the rotation angle range of 90°–145° is not arbitrarily set, but is the optimal solution derived from simulation analysis of the rear space of mainstream models: 90° can meet the basic exposure requirements, while 120°–145° is suitable for high-end models with more rounded shapes and deeper inner cavities, reflecting good platform adaptability.

[0063] The second aspect of this application provides a vehicle frame, including: a trailer hitch fixing bracket 21 and a trailer power supply device as described in any of the first aspects above, wherein a first mounting arm 11 of the trailer power supply device is fixed to the trailer hitch fixing bracket 21.

[0064] Based on the above structure, no additional mounting points or modifications to the main frame structure are required, fully utilizing the existing load-bearing and connection resources of the vehicle chassis to achieve a compact layout and efficient integration of functional modules. Because the trailer hitch mounting bracket 21 itself has high strength and rigidity, it provides a stable and reliable mounting foundation for the trailer power take-off device, ensuring structural stability during vehicle movement, towing, and rotation operations, effectively preventing loosening or failure due to vibration or external forces. Simultaneously, this design allows for high spatial coordination between the power take-off device and the trailer hitch, facilitating simultaneous mechanical traction and electrical connection when connecting the trailer, improving overall operational efficiency. Therefore, this frame not only possesses excellent structural compatibility and ease of assembly but also significantly enhances the functionality and safety of the entire vehicle in towing scenarios.

[0065] A third aspect of this application provides a vehicle, including: a trailer power take-off device as described in any of the first aspects above, or a vehicle frame as described in the second aspect above.

[0066] This vehicle integrates a rotatable trailer power take-off device, allowing the connector to be concealed inside the bumper when not in use and conveniently exposed when needed. This effectively solves the problems of traditional exposed power take-off devices being susceptible to rain, dust intrusion, and mechanical impact damage. When using a chassis incorporating this trailer power take-off device, the entire vehicle achieves highly efficient coordination between the electrical interface and the chassis structure, requiring no additional drilling or modification. This maintains the overall integrity of the vehicle's appearance and aerodynamic performance while improving the safety and convenience of towing operations. Whether installed as a standalone device or integrated into the chassis, this technical solution seamlessly adapts to various vehicle types, including passenger cars, SUVs, pickup trucks, and light commercial vehicles, significantly enhancing the vehicle's practicality, durability, and user experience in towing scenarios.

[0067] For any parts not mentioned in this application, existing technologies may be used or referenced.

[0068] The various embodiments in this specification are described in a progressive manner. The same or similar parts between the various embodiments can be referred to each other. Each embodiment focuses on describing the differences from other embodiments.

[0069] The above description is merely an embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A trailer power take-off device, characterized in that, include: The first mounting arm (11) is mounted on the trailer hook fixing bracket (21); The second mounting arm (12) is rotatably connected to the first mounting arm (11) and is used to install the trailer power take-off connector (31). A rotational stroke limiter (13) is provided at the rotational connection between the first mounting arm (11) and the second mounting arm (12); In the non-use state, the trailer power port connector (31) rotates with the second mounting arm (12) to a hidden position and is embedded inside the bumper. In the use state, the trailer power port connector (31) rotates with the second mounting arm (12) to an exposed position, which facilitates connection to an external trailer power source.

2. The trailer power take-off device according to claim 1, characterized in that, The rotational stroke limiter (13) includes a first rotating ring (131) and a second rotating ring (132) that rotate and engage with each other. The first rotating ring (131) is disposed on the first mounting arm (11), and the second rotating ring (132) is disposed on the second mounting arm (12).

3. The trailer power take-off device according to claim 2, characterized in that, One of the first rotating ring (131) and the second rotating ring (132) has a rotation limit stop (1311), and the other has a rotation groove (1321). The rotation limit stop (1311) is slidably embedded in the rotation groove (1321).

4. The trailer power take-off device according to claim 3, characterized in that, The rotation limit stop (1311) is provided with at least two, and the rotation slide (1321) is provided with at least two sections.

5. The trailer power take-off device according to claim 2, characterized in that, The first rotating ring (131) and the second rotating ring (132) are bolted together.

6. The trailer power take-off device according to any one of claims 1 to 5, characterized in that, The second mounting arm (12) is provided with a handle (121) or a paddle structure for the user to apply force to drive the second mounting arm (12) to rotate relative to the first mounting arm (11).

7. The trailer power take-off device according to any one of claims 1 to 5, characterized in that, The trailer power connector (31) is electrically connected to the vehicle power system via a wiring harness (311), which has a flexible telescopic section or redundant length to accommodate the displacement changes of the second mounting arm (12) during rotation.

8. The trailer power take-off device according to any one of claims 1 to 5, characterized in that, The rotation angle of the second mounting arm (12) is 90° to 145°.

9. A vehicle frame, characterized in that, include: The trailer hook fixing bracket (21) and the trailer power outlet device as described in any one of claims 1 to 8, wherein the first mounting arm (11) of the trailer power outlet device is fixed to the trailer hook fixing bracket (21).

10. A vehicle, characterized in that, include: The trailer power take-off device as described in any one of claims 1 to 8, or the vehicle frame as described in claim 9.

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