Low-speed electric four-wheel vehicle tail door structure

Abstract

The application relates to a low-speed electric four-wheel vehicle tail door structure which comprises an outer plate, an inner plate and a supporting frame; the outer plate and the inner plate are matched in shape and are fixed correspondingly to form a closed tail door cavity structure; the supporting frame is embedded in the tail door cavity structure, the upper part of the supporting frame is provided with a hinge mounting position, the lower part is provided with a door lock mounting position, the hinge mounting position protrudes from the rear of the inner plate and is provided with a hinge fixing part, the inner plate is provided with a lock hole corresponding to the door lock mounting position, and the lock hole is provided with a door lock connected with the door lock mounting position. The main body adopts an integrated round pipe frame as a core bearing structure, the structural mechanics stability is excellent, the stress is uniform, the torsion resistance and bending resistance are strong, the structural strength of the tail door is completely up to the standard of traditional sheet metal tail doors, there is no deformation and abnormal sound during long-term opening and closing, and the use reliability is high.

Description

Technical Field

[0001] This invention belongs to the field of automotive body parts technology, and specifically relates to a tailgate structure for a low-speed electric four-wheeled vehicle. Background Technology

[0002] Low-speed electric four-wheelers and micro new energy vehicles, due to their small size and high energy consumption requirements, have stringent requirements for lightweight and low-cost body components. Currently, most traditional low-speed electric vehicle tailgates on the market adopt a one-piece sheet metal stamping structure. To ensure the tailgate's opening and closing rigidity, deformation resistance, and installation stability, a thick single piece of steel plate needs to be stamped, which has obvious technical defects: the structure has a large self-weight, the overall vehicle curb weight is relatively high, directly increasing the vehicle's driving energy consumption, which does not conform to the lightweight design trend of new energy micro vehicles; the single sheet metal consumes a large amount of material, and the stamping, grinding, and painting processes are complex, resulting in high mold development and mass production costs; the solid sheet metal structure has excessive redundant strength, while the stress conditions of micro tailgates are simple and do not require the support of a thick sheet metal body, resulting in material waste.

[0003] Existing plastic-coated tailgate structures often employ irregular steel reinforcement, resulting in a chaotic support layout, uneven stress distribution, and issues such as localized deformation, abnormal noise, and poor assembly precision. This fails to simultaneously meet the requirements of structural strength, lightweight design, and low cost. Based on these shortcomings of existing technologies, there is an urgent need to design a tailgate structure for low-speed electric vehicles that is structurally regular, distributes stress evenly, maintains strength, and reduces weight and cost. Summary of the Invention

[0004] To address the problems of existing technologies, this invention proposes a tailgate structure for a low-speed electric four-wheeled vehicle. The purpose of this invention and the solution to its technical problems are achieved through the following technical solutions.

[0005] According to the present invention, a tailgate structure for a low-speed electric four-wheeled vehicle includes an outer panel, an inner panel, and a support frame. The outer panel and the inner panel are matched in shape and are fixed together to form a closed tailgate cavity structure. The support frame is embedded inside the tailgate cavity structure. The upper part of the support frame is provided with a hinge mounting position, and the lower part is provided with a door lock mounting position. The hinge mounting position protrudes from the inner panel and is provided with a hinge fixing part. The inner panel is provided with a lock hole corresponding to the door lock mounting position, and a door lock connected to the door lock mounting position is provided in the lock hole.

[0006] Furthermore, the support frame is an integrated closed-loop circular tube structure, which is arranged in the outline inside the tailgate cavity structure, and its edges are attached and fixed to the inner side of the outer panel and the inner panel.

[0007] Furthermore, the outer panel and the inner panel are detachably connected.

[0008] Furthermore, the support frame is provided with several fixed points for connecting with the outer and inner panels.

[0009] Furthermore, a reinforcing tube is provided in the middle of the support frame.

[0010] Furthermore, the inner panel is provided with sealing sponge strips for sealing and conforming to the vehicle's design.

[0011] Furthermore, a window is provided in the tailgate cavity structure, and glass is provided on the outside of the window.

[0012] Furthermore, a hinge is installed on the hinge fixing part for connection with the vehicle.

[0013] In summary, the present invention has the following advantages: 1. Maintain strength and prevent deformation: The main body adopts an integrated round tube frame as the core load-bearing structure, which has excellent structural mechanical stability, uniform stress distribution, strong torsional and bending resistance, and is fully comparable to the structural strength of traditional sheet metal tailgates. It can be opened and closed for a long time without deformation or abnormal noise, and has high reliability.

[0014] 2. Significantly reduced weight and energy consumption: Abandoning the traditional single-piece heavy sheet metal structure, it is replaced by a thin-walled round tube iron frame and an inner and outer panel cladding composite structure, which significantly reduces metal consumption and reduces the overall weight of the tailgate by more than 30%, effectively reducing the overall vehicle curb weight and meeting the energy-saving requirements of microcars and new energy vehicles.

[0015] 3. Significant cost reduction and ease of mass production: Engineering plastic injection molding process is simple and yield rate is high. Round tube iron frame molding process is mature and consumes less material. No large stamping molds and complex spraying process are required. Raw material cost, mold cost and processing cost are all significantly reduced, and mass production economy is excellent.

[0016] 4. Well-organized structure and strong adaptability: The overall structure is miniaturized and compact, with full coverage of inner and outer panels. It has a beautiful appearance, good sealing performance, and is precisely adapted to the installation conditions of small tailgates in microcars, micro commuter vehicles, etc., making it highly versatile.

[0017] The above description is merely an overview of the technical solution of the present invention. In order to better understand the technical means of the present invention and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of the present invention more apparent and understandable, preferred embodiments are described in detail below with reference to the accompanying drawings. Attached Figure Description

[0018] Figure 1 This is a cross-sectional schematic diagram of the tailgate structure of a low-speed electric four-wheeled vehicle according to the present invention.

[0019] Figure 2 This is a schematic diagram of the support frame in this invention.

[0020] Figure 3 This is a schematic diagram of the outer plate in this invention.

[0021] Figure 4 This is a schematic diagram of the inner plate in this invention. Detailed Implementation

[0022] The technical solution of the present invention will be further described below with reference to the accompanying drawings and preferred embodiments.

[0023] Please see Figure 1 , Figure 2 A tailgate structure for a low-speed electric four-wheeled vehicle is disclosed. The main body is adapted to the tailgate dimensions of low-speed electric vehicles with a width of up to 1000mm and a height of up to 900mm. Specifically, it includes an outer panel 1, an inner panel 2, and a support frame 9. Specifically, the outer panel 1 and the inner panel 2 are both injection molded from high-strength engineering plastics, which has the advantages of high molding precision and good appearance flatness. At the same time, no complicated post-processing procedures are required, which can significantly reduce processing costs. The support frame 9 is an integrated closed-loop circular tube structure, which is formed by bending 2mm thin-walled circular steel tubes. The structure is symmetrical and the mechanical transmission is uniform.

[0024] Please see Figure 3 , Figure 4 The outer panel 1 and the inner panel 2 are shaped to match (their shapes conform to the streamlined design of the vehicle's tailgate), and after being fixed together, they form a closed tailgate cavity structure with good dustproof and waterproof sealing. The tailgate cavity structure also has a window with glass 5 on the outside. At the same time, the edges of the two are provided with sealing mating edges and snap-fit ​​positioning ribs to ensure that the two are precisely aligned and snapped together. After snapping together, they can be detached and connected (fixed by bolts and self-tapping screws). The aforementioned support frame 9 is embedded in the center of the tailgate cavity structure, and its overall shape matches the contour of the tailgate cavity structure. Its edges are attached and fixed to the inner side of the outer panel 1 and the inner panel 2. The support frame 9 also has several fixing points for connecting with the outer panel 1 and the inner panel 2 (fixed by bolts), so that there is no gap between the support frame 9 and the tailgate cavity structure, avoiding loosening and abnormal noise during use.

[0025] The support frame 9 has a reinforcing tube 10 in the middle, a hinge mounting position 7 at the top, and a door lock mounting position 8 at the bottom. The hinge mounting position 7 protrudes from the inner panel 2 and is fitted with a hinge fixing part 3. The hinge fixing part 3 is fitted with a hinge 11 for connecting to the vehicle. The inner panel 2 has a lock hole 4 corresponding to the door lock mounting position 8. The lock hole 4 is fitted with a door lock 12 connected to the door lock mounting position 8, so that all the load-bearing mounting points are directly integrated on the support frame 9. The load is directly borne by the support frame 9. The inner and outer plastic panels only serve the functions of appearance covering and sealing protection, fully ensuring that the tailgate installation strength and opening and closing durability are no less than those of traditional full sheet metal tailgates. In actual assembly and use, the support frame 9 is directly connected to the vehicle body hinge and lock mechanism through the mounting points to complete the overall assembly of the tailgate. Actual testing showed that the tailgate structure meets the national standard performance requirements for automotive tailgates in terms of bending strength, impact resistance, and number of opening and closing cycles, perfectly achieving the R&D goals of maintaining strength, reducing weight and cost, and miniaturization for compatibility.

[0026] Furthermore, the inner panel 2 is provided with a sealing sponge strip 6 for sealing and conforming to the vehicle body, which can further improve the vehicle's noise reduction and sealing performance.

[0027] The above description is merely a preferred embodiment of the present invention. Any simple modifications, equivalent changes, and alterations made by those skilled in the art to the above embodiments without departing from the scope of the present invention and based on the technical essence of the present invention shall still fall within the scope of the present invention.

Claims

1. A tailgate structure for a low-speed electric four-wheeled vehicle, characterized in that: It includes an outer panel (1), an inner panel (2), and a support frame (9); the outer panel (1) and the inner panel (2) are matched in shape and are fixed together to form a closed tailgate cavity structure; the support frame (9) is embedded in the tailgate cavity structure, the upper part of the support frame (9) is provided with a hinge mounting position (7), the lower part is provided with a door lock mounting position (8), the hinge mounting position (7) protrudes from the inner panel (2) and is provided with a hinge fixing part (3), and the inner panel (2) is provided with a lock hole (4) corresponding to the door lock mounting position (8), and the lock hole (4) is provided with a door lock (12) connected to the door lock mounting position (8).

2. The tailgate structure of a low-speed electric four-wheeled vehicle according to claim 1, characterized in that: The support frame (9) is an integrated closed-loop circular tube structure, which is arranged in the outline of the tailgate cavity structure, and its edge is attached and fixed to the inner side of the outer panel (1) and the inner panel (2).

3. The tailgate structure of a low-speed electric four-wheeled vehicle according to claim 1, characterized in that: The outer panel (1) and the inner panel (2) are detachably connected.

4. The tailgate structure of a low-speed electric four-wheeled vehicle according to claim 1, characterized in that: The support frame (9) is provided with several fixed points for connecting with the outer panel (1) and the inner panel (2).

5. The tailgate structure of a low-speed electric four-wheeled vehicle according to claim 1, characterized in that: A reinforcing tube (10) is provided in the middle of the support frame (9).

6. The tailgate structure of a low-speed electric four-wheeled vehicle according to claim 1, characterized in that: The inner panel (2) is provided with a sealing sponge strip (6) for sealing and conforming to the vehicle.

7. The tailgate structure of a low-speed electric four-wheeled vehicle according to claim 1, characterized in that: The tailgate cavity structure has a window, and the outside of the window is fitted with glass (5).

8. The tailgate structure of a low-speed electric four-wheeled vehicle according to claim 1, characterized in that: A hinge (11) is mounted on the hinge fixing part (3) for connecting to the vehicle.

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