Electric bicycle aluminum seat barrel two-dimensional curved surface metal plate rib integrated design method

Abstract

According to the electric bicycle aluminum seat cask two-dimensional curved surface metal plate rib integrated design method, a seat cask body is of a multi-curved-surface wide thin-wall cavity structure and is integrally formed through aluminum extrusion, a plurality of auxiliary ribs are arranged on the outer wall of the seat cask body, a shell bottom plate and a frame connecting piece can be connected with the bottom and the top of the seat cask body through the auxiliary ribs, and a seat cushion connecting piece is fixed to the side face of the front end of the seat cask body. According to the seat cask, the two-dimensional curved surface metal plate and rib integrated design is adopted, reinforcing ribs and the connecting function are integrated, forming is directly conducted in the extrusion process, the design is the function, and the structure is the part, and the overall efficiency and performance are greatly improved; meanwhile, through multi-dimensional innovation of material science, structural design and manufacturing process, the contradiction among light weight, strength, cost and environmental protection of a traditional electric bicycle seat cask is successfully solved, a solution with remarkable competitive advantages is provided, and the electric bicycle seat cask is expected to lead the upgrading and updating of the electric bicycle seat cask technology and has wide application prospects. And the industry is promoted to change to the direction of high-quality and sustainable development.

Description

Technical Field

[0001] This invention relates to the field of electric bicycle technology, specifically to a method for integrated design of two-dimensional curved sheet metal reinforcement in the aluminum seat of an electric bicycle. Background Technology

[0002] my country is the world's largest producer, seller, and user of electric bicycles, with sales exceeding 60 million units by 2025, accounting for 70-80% of the global electric bicycle market share. As an important tool for modern urban transportation, the design and material selection of the seat, a core component of electric bicycles, directly impacts the overall performance, safety, and user experience. Traditional electric bicycle seat boxes primarily employ two manufacturing processes: injection-molded plastic seat boxes and sheet metal stamped steel seat boxes. Plastic seat boxes are widely used due to their low production cost and high design flexibility, but they suffer from inherent defects such as low strength, susceptibility to deformation and aging, and poor flame retardancy. While steel seat boxes offer high structural strength, they are heavy, prone to corrosion, and require expensive stamping molds, making it difficult to meet the lightweight requirements of modern electric bicycles.

[0003] With the implementation of the "Safety Technical Specifications for Electric Bicycles" GB 17761-2024, stricter restrictions have been imposed on the proportion of plastic used in electric bicycles and the overall weight of the bicycles—"the total mass of plastic used in electric bicycles should not exceed 5.5% of the total weight of the bicycle," and "the total weight of a fully assembled electric bicycle using lead-acid batteries should be less than or equal to 63 kg, and the total weight of other types of fully assembled electric bicycles should be less than or equal to 55 kg." Traditional seat bucket designs can no longer meet the requirements of the new regulations. The industry urgently needs a new seat bucket solution that can balance lightweight and structural strength, and possess high flame retardancy and environmental protection characteristics.

[0004] Analysis of existing patented technologies reveals that current innovations in seat buckets primarily focus on three areas: space optimization, functional integration, and structural reinforcement. For example, patent CN202322332484.7, developed by Tailing Technology Co., Ltd., employs a partitioned design, dividing the interior of the seat bucket into upper and lower accommodating areas to improve space utilization and accommodate different battery sizes. Patent CN202322254169.7, from Jiangsu Aima Vehicle Technology Co., Ltd., integrates a battery charger into the inner cover of the seat bucket, enhancing charging convenience. Patent CN202210437341.X, from Taizhou Huangyan Yinheng Plastic Moulding Co., Ltd., utilizes hydraulic molding and injection molding to produce a plastic-coated aluminum frame body with iron components, upon which the seat bucket is mounted, improving overall vehicle structural strength without welding and thus avoiding environmental pollution. While existing patented technologies have made some progress in seat bucket space optimization, functional integration, and structural design, significant limitations remain.

[0005] From a materials perspective, most patents are still based on traditional plastics or steel, failing to overcome the inherent limitations of these materials in terms of lightweighting, strength, corrosion resistance, and flame retardancy. From a manufacturing process perspective, injection molding and integral sheet metal stamping remain the mainstream processes. While the former is suitable for complex shapes, its strength is limited, and the latter has high strength but expensive molds, making it particularly unsuitable for small-batch customized production.

[0006] From a structural design perspective, existing patents mostly focus on localized optimizations and lack systemic solutions. For example, while space optimization patents improve storage efficiency, they do not address the limitations of the materials themselves; integrated charging patents enhance convenience but may increase the complexity of the storage compartment, affecting heat dissipation and maintenance feasibility; structural reinforcement patents improve structural strength, but the processes are complex and production costs are high, making them unsuitable for mass production. Furthermore, existing designs do not adequately consider environmental protection and recyclability, making it difficult to meet increasingly stringent environmental regulations and green manufacturing requirements.

[0007] In conclusion, while existing patented technologies for electric bicycle seat buckets have made progress in optimizing specific functions, they are limited by traditional materials and processes, failing to provide a comprehensive breakthrough solution. The market urgently needs a completely new solution encompassing materials, structure, and manufacturing processes to fundamentally resolve the contradictions between lightweighting, strength, cost, and environmental protection, in order to meet the requirements of new national standards and users' demands for improved product quality. Summary of the Invention

[0008] To address the aforementioned issues, this invention provides a two-dimensional curved sheet metal reinforcement integrated design method for electric bicycle aluminum seat buckets. The seat bucket body adopts a "two-dimensional curved sheet metal reinforcement integrated" design, integrating the reinforcing ribs and connecting functions (C-shaped screw grooves) into one unit, directly formed during the extrusion process. This achieves "design as function, structure as part," greatly improving overall efficiency and performance. The seat bucket body and its components are mainly connected by bolts (mechanically), ensuring connection strength and stability while avoiding structural deformation and stress concentration caused by extensive welding. Through multi-dimensional innovation in materials science, structural design, and manufacturing processes, this invention successfully resolves the contradictions between lightweighting, strength, cost, and environmental protection in traditional electric bicycle seat buckets, providing a solution with significant competitive advantages. It is expected to lead the upgrade of electric bicycle seat bucket technology and promote the industry's transformation towards high-quality and sustainable development.

[0009] To achieve the above objectives, the technical solution of the present invention is as follows: A two-dimensional curved sheet metal rib integrated design method for an electric bicycle aluminum seat bucket. The seat bucket body is a multi-curved wide thin-walled cavity structure, which is integrally formed by aluminum extrusion. The outer wall is provided with several auxiliary ribs, which are C-shaped screw grooves. The bottom plate of the shell, the frame connector and the bottom and top of the seat bucket body can be bolted and fixed through the auxiliary ribs. The auxiliary ribs are fitted and positioned with the frame. The seat cushion connector is fixed to the front side of the seat bucket body.

[0010] The use of aluminum alloy to replace traditional plastics and steel represents a fundamental material revolution. Compared to traditional materials, aluminum alloy boasts an excellent strength-to-weight ratio; its density is only about one-third that of steel, yet its specific strength is close to or even exceeds that of ordinary steel. This significantly reduces the weight of the seat compartment, meeting the stringent requirements of the new national standards for the overall weight of electric bicycles. Regarding flame retardancy, aluminum alloy is naturally non-combustible with a melting point as high as 660℃, far exceeding the combustion point of plastic materials. This fundamentally solves the safety hazard of flammable plastic seat compartments and greatly improves the fire safety level of electric bicycles.

[0011] In terms of environmental performance, aluminum alloy materials are highly recyclable, 100% recyclable, and the energy consumption for producing recycled aluminum is only 5% of that for primary aluminum, fully meeting the requirements of green manufacturing and a circular economy. In contrast, plastic toilet seats have low recycling rates and are prone to environmental pollution during recycling, while steel toilet seats, although recyclable, have poor corrosion resistance and short service life. The aluminum alloy material used in this patent has strong corrosion resistance, effectively resisting environmental corrosion from rainwater, moisture, etc., extending product lifespan, and reducing resource waste.

[0012] More importantly, aluminum alloys offer mature and diverse surface treatment processes, enabling various aesthetic effects through anodizing, electrophoretic coating, and other techniques to meet consumers' demands for beauty. Aluminum alloys also possess excellent thermal conductivity, aiding in internal heat management and preventing safety hazards such as battery overheating. These material properties make aluminum alloys an ideal choice for electric bicycle seat storage, overcoming the limitations of traditional materials and providing a foundation for product upgrades.

[0013] The seat bucket features a two-dimensional curved sheet metal and rib integrated design. Several auxiliary ribs are incorporated into the outer wall. These ribs not only serve as C-shaped screw slots for tapping and bolting to the aluminum stamping parts, but also enhance structural strength and provide positioning for integration with the frame, achieving a perfect unity of function and structure. This design, through integrated sheet metal and ribs, creates multiple load paths, significantly improving the overall rigidity and impact resistance of the seat bucket. Compared to traditional planar structures, the multi-curved surface design more effectively disperses stress and improves deformation resistance. Especially in the event of a vehicle collision or drop, the raised curved surface better protects the battery and other items inside the seat bucket.

[0014] The extrusion molding of the toilet seat body includes the following steps: S1. Prepare raw material aluminum ingots and master alloy: Mg: 0.93%~1%, Si: 0.97%~1.05%, Fe: 0.25%, Cu: <0.1%, Mn: 0.45~0.53%, Zn: <0.05%, Cr: 0.1~0.18%, Ti: <0.1%, C <0.1%, with the balance being aluminum and unavoidable impurities; S2. The raw materials are smelted into liquid aluminum alloy, and after refining, degassing and removing impurities, the liquid aluminum alloy is cast into aluminum alloy round ingots. S3. The aluminum alloy round ingot obtained by homogenization heat treatment S2 is heated to 430-480℃ and held for 3-5 hours, then heated to 565-580℃ and held for 7-10 hours, and then cooled to obtain homogenized aluminum alloy round ingot. S4. Heating extrusion cylinder, aluminum alloy round ingot and mold. The heating temperature of the extrusion cylinder is 420-470℃, the heating temperature of the aluminum alloy round ingot is 450-500℃, and the heating temperature of the mold is 400-450℃. S5. The barrel body profile is obtained by extrusion of aluminum alloy round ingots at an extrusion speed of 5-12 m / min. S6. Online quenching of the bucket body profile; S7. The seat bucket body profile returns to online tension straightening, with a tension rate of 0.3% to 1.2%; S8. The body profile of the toilet seat is cut to length; S9. The body profile of the toilet seat undergoes solution treatment and artificial aging. The solution treatment temperature is 530-550℃, the heat preservation time is 1-2 hours, the aging temperature is 160-200℃, and the aging time is 4-6 hours. S10. The form and position tolerances and dimensional tolerances of the seat bucket body profile are inspected. After passing the inspection, the seat bucket body profile blank is obtained.

[0015] In terms of manufacturing process, the toilet seat body adopts aluminum alloy extrusion molding technology, realizing the one-time molding of a multi-curved, wide, thin-walled cavity structure. Compared with traditional sheet metal stamping of toilet seats, extrusion molding can better control material flow and microstructure, improving product consistency and mechanical properties.

[0016] The bottom plate of the housing has a fitting step in the middle that fits into the inner wall of the seat body. The fitting step has several strip grooves and a circular groove A. The center of the circular groove A has a mounting hole A and bolts are used to connect the bottom plate of the housing to the bottom frame. The outer ring of the bottom plate of the housing has several bolt connection holes A for connecting to the bottom of the seat body.

[0017] The interlocking step in the middle is for easy and quick snap-fit ​​installation of the shell base plate, and also serves as a limit to prevent slight displacement when the bolts on the shell base plate loosen.

[0018] The main function of the groove is to provide installation positioning and fixed support for the battery cells of the battery pack. Specifically: (1) From the perspective of structural compatibility, the shape of the groove matches the arrangement and size of the battery cells in the battery pack, which can accurately insert the battery cells and prevent the battery from shifting due to bumps and vibrations in the battery holder, thus ensuring the overall stability of the battery pack; (2) From the perspective of installation logic, the groove serves as a "positioning reference" and can help the battery pack be installed quickly and accurately under the battery holder, improving assembly efficiency; (3) From the perspective of safety protection, the structural design of the groove can improve the structural strength of the base plate, disperse the force on the battery pack, reduce the impact of vibration on the battery, indirectly extend the battery life, and reduce the safety risks caused by battery displacement (such as short circuits, poor contact, etc.). The circular groove design makes the bolts lower than the base plate surface after installation, preventing the bolts from protruding and damaging the battery, and also improving the structural strength of the bolt connection.

[0019] The frame connector is made of stamped aluminum, with openings at the front and inside for mounting the seat cushion connector and inserting the battery. The end has a circular groove B, with a mounting hole B in the center for bolt connection to the top frame. The inner ring has several bolt holes B for connection to the top of the seat bucket body. The circular groove also prevents bolt protrusion from damaging the seat cushion and improves the structural strength of the bolt connection.

[0020] The seat cushion connector is a hinge structure with a cross-section mainly consisting of right-angled triangular prisms. It is hollow and features a contoured design where it fits the side wall of the seat body, ensuring a good fit. It is laser-welded, resulting in minimal deformation, high precision, and high strength. On the other side, there is a hinge connection hole to connect the other half of the hinge, which then hinges to the seat cushion, facilitating the opening of the seat cushion for battery replacement or maintenance. The side wall in the middle of the hinge connection hole has a seat cushion locking hole, which is used to insert a pin to lock the hinge and thus the seat cushion, preventing the theft of the battery or other items under the seat cushion.

[0021] Compared to traditional toilet seat technology, this invention achieves significant improvements in several performance indicators. In terms of weight reduction, the aluminum alloy toilet seat is more than 40% lighter than a steel toilet seat of equivalent strength, and its strength is several times higher than that of a plastic toilet seat at the same weight. Regarding structural strength, the integrated design of two-dimensional curved sheet metal reinforcement significantly improves the toilet seat's pressure and impact resistance, effectively protecting the internal battery and control system and extending its service life. In terms of production costs, although the cost of aluminum alloy material is higher than that of plastic, the mold cost of extrusion molding is far lower than that of sheet metal stamping, and it is suitable for mass production, resulting in a significant overall cost advantage. Regarding the connection structure, the toilet seat body and its components of this invention are mainly connected by bolts (mechanically), ensuring connection strength and stability while avoiding structural deformation and stress concentration caused by extensive welding.

[0022] From a market competition perspective, this patented technology perfectly meets the requirements of the "Safety Technical Specification for Electric Bicycles" GB17761-2024, resolving the compliance issues of traditional seat buckets under the new standard. Simultaneously, the high-quality feel and aesthetics of the aluminum alloy seat bucket help enhance the brand image and added value of the electric bicycle, meeting the demands of consumption upgrading. From an industry chain perspective, the stable supply of aluminum alloy materials and the mature recycling system are conducive to forming a green circular economy model, aligning with carbon neutrality policy guidelines.

[0023] Advantages of the invention: 1. The seat body of this invention adopts a "two-dimensional curved surface sheet metal reinforcement integrated" design, which integrates the reinforcing ribs and connecting functions (C-type screw grooves) into one, and is formed directly in the extrusion process, realizing "design is function, structure is part". This design not only strengthens the structural strength and fits and positions, but also significantly improves the overall rigidity and impact resistance of the seat. Compared with the traditional planar structure, the multi-curved surface design can more effectively disperse stress and improve the resistance to deformation. Especially in the event of a vehicle collision or fall, it can better protect the battery and other items inside the seat.

[0024] 2. The seat bucket body, shell base plate, frame connector and seat cushion connector of this invention are all made of aluminum alloy, which combines the lightweight of plastic, the strength and flame retardancy of plastic, and the corrosion resistance and processability of steel, thus greatly extending the service life. At the same time, the aluminum alloy material used can be 100% recycled, and the energy consumption for recycling and remelting is only 5% of that for producing primary aluminum, which has significant environmental advantages. Waste materials in the extrusion and stamping production process can also be directly recycled, and the material utilization rate is much higher than that of traditional processing methods.

[0025] 3. The seat body of this invention is integrally extruded. Compared with traditional plastic seat bodies or integral sheet metal stamping seat bodies, the cross-section of the seat body can be designed into a complex cross-section as needed, which has a wide range of applications. The mold cost is also much lower than that of integral sheet metal stamping molds, making it suitable for mass production. It can quickly respond to changes in market demand and is conducive to promotion and application.

[0026] 4. The main body of the seat and its components of this invention are connected by bolts (mechanically), which not only ensures the connection strength and stability, but also avoids structural deformation and stress concentration caused by a large amount of welding. Attached Figure Description

[0028] Figure 1 This is an elevation view of the bucket seat of the present invention; Figure 2 This is a top view of the seat bucket of the present invention; Figure 3 for Figure 2 A cross-sectional view along the AA direction; Figure 4 for Figure 2 Enlarged structural diagram at point I; Figure 5 for Figure 3 Enlarged structural diagram at point II; Figure 6 This is an elevation view of the main body of the toilet seat of the present invention; Figure 7 This is a cross-sectional view of the toilet seat body of the present invention; Figure 8 This is an elevation view of the bottom plate of the housing of the present invention; Figure 9 This is an elevation view of the seat cushion connector of the present invention; Figure 10 This is a deformation cloud diagram from the finite element analysis of the seat bucket of the present invention; Figure 11 This is a stress cloud diagram from the finite element analysis of the seat bucket of this invention; The numbers and component names in the diagram are as follows: 1-Seat bucket body; 11-Auxiliary rib; 2-Shell base plate; 21-Strip groove; 22-Circular groove A; 221-Mounting hole A; 23-Matching step; 24-Bolt connection hole A; 3-Frame connector; 31-Circular groove B; 311-Mounting hole B; 32-Bolt connection hole B; 4-Seat cushion connector; 41-Hinge connection hole; 42-Seat cushion locking hole. Detailed Implementation

[0029] To provide a more detailed description of the present invention, the following description is provided in conjunction with embodiments and accompanying drawings.

[0030] Example 1

[0031] As attached Figures 1-7 As shown, a two-dimensional curved surface sheet metal integrated design method for an electric bicycle aluminum seat bucket is disclosed. The seat bucket body 1 is a multi-curved wide thin-walled cavity structure, which is integrally formed by aluminum extrusion. The alloy grade and temper are 6082-T6. Several auxiliary ribs 11 are provided on the outer wall. The auxiliary ribs 11 are C-shaped screw grooves. The bottom plate 2 of the shell and the frame connector 3 can be bolted to the bottom and top of the seat bucket body 1 through the auxiliary ribs 11. The auxiliary ribs 11 are fitted and positioned with the frame. The seat cushion connector 4 is fixed to the front side of the seat bucket body 1.

[0032] The extrusion molding of the seat body 1 includes the following steps: S1. Prepare raw material aluminum ingots and master alloy: Mg: 0.96%, Si: 1%, Fe: 0.25%, Cu: 0.09%, Mn: 0.5%, Zn: 0.02%, Cr: 0.15%, Ti: 0.08%, C: 0.08%, with the balance being aluminum and unavoidable impurities; S2. The raw materials are smelted into liquid aluminum alloy, and after refining, degassing and removing impurities, the liquid aluminum alloy is cast into aluminum alloy round ingots. S3. The aluminum alloy round ingot obtained by homogenization heat treatment S2 is heated to 450℃ and held for 5 hours, then heated to 580℃ and held for 8 hours, and then cooled to obtain homogenized aluminum alloy round ingot. S4. Heating extrusion cylinder, aluminum alloy round ingot and mold. The heating temperature of the extrusion cylinder is 450℃, the heating temperature of the aluminum alloy round ingot is 480℃, and the heating temperature of the mold is 420℃. S5. The barrel body profile is obtained by extruding aluminum alloy round ingots at an extrusion speed of 8m / min. S6. Online quenching of the bucket body profile; S7. The bucket body profile is returned to online tension straightening, with a tension rate of 1%; S8. The body profile of the toilet seat is cut to length; S9. The body profile of the toilet seat undergoes solution treatment and artificial aging. The solution treatment temperature is 540℃, the heat preservation time is 2 hours, the aging temperature is 180℃, and the aging time is 5 hours. S10. The form and position tolerances and dimensional tolerances of the seat bucket body profile are inspected. After passing the inspection, the seat bucket body profile blank is obtained.

[0033] like Figure 2 , Figure 3 , Figure 5 , Figure 8 As shown, the bottom plate 2 of the housing is provided with a fitting step 23 in the middle, which fits into the inner wall of the seat body 1. The fitting step 23 is provided with a number of strip grooves 21 and circular grooves A22. The center of the circular groove A22 is provided with a mounting hole A221, and the bottom plate 2 of the housing is connected to the bottom frame of the vehicle by bolts. The outer ring of the bottom plate 2 is provided with a number of bolt connection holes A24 for connecting to the bottom of the seat body 1.

[0034] like Figures 1-4 As shown, the frame connector 3 has an opening at the front end and inside for installing the seat cushion connector 4 and inserting the battery. The end has a circular groove B31, and the center of the circular groove B31 has a mounting hole B311 for connecting to the top frame of the frame with bolts. The inner circle has several bolt connection holes B32 for connecting to the top of the seat bucket body 1.

[0035] like Figure 9 As shown, the seat cushion connector 4 is a hinge structure. The part that fits against the side wall of the seat body 1 is designed to mimic the shape. The other side is provided with a hinge connection hole 41 to connect the other half of the hinge and then to the seat cushion for hinge connection. The side wall in the middle of the hinge connection hole 41 is provided with a seat cushion locking hole 42.

[0036] like Figures 10-11As shown, the seat bucket is designed to weigh 2.14 kg. A force of 1500 N is applied to the surface of the frame connector 3 at the support point where the base plate 2 of the fixed shell is connected to the frame connector 3. Finite element analysis shows that the frame connector 3 of the seat bucket is the main deformable part, while the seat bucket body 1 and the base plate 2 of the shell are basically undeformed. The maximum deformation occurs at the edge of the frame connector 3, which is 0.67 mm. Analysis of the stress cloud diagram shows that the stress values ​​are basically distributed within 40 MPa, and the maximum stress occurs at the bolt connection between the seat bucket body 1 and the frame connector 3.

[0037] In summary, the seat bucket designed in this invention has many advantages such as light weight, corrosion resistance, high strength, high flame retardancy, and high recyclability, meeting the requirements of the new regulations for electric bicycles on the proportion and quality of plastic in the whole vehicle, and is more competitive in the future electric bicycle market.

Claims

1. A method for integrated design of two-dimensional curved surface sheet metal reinforcement in the aluminum seat of an electric bicycle, characterized by: The seat bucket body (1) is a multi-curved wide thin-walled cavity structure, which is integrally formed by aluminum extrusion. The outer wall is provided with several auxiliary ribs (11). The auxiliary ribs (11) are C-shaped screw grooves. The bottom plate (2) of the shell, the frame connector (3) and the bottom and top of the seat bucket body (1) can be bolted and fixed through the auxiliary ribs (11). The auxiliary ribs (11) are fitted and positioned with the frame. The seat cushion connector (4) is fixed on the front side of the seat bucket body (1).

2. The integrated design method for two-dimensional curved sheet metal reinforcement of electric bicycle aluminum seat as described in claim 1, characterized in that, The extrusion molding of the seat body (1) includes the following steps: S1. Prepare raw material aluminum ingots and master alloy: Mg: 0.93%~1%, Si: 0.97%~1.05%, Fe: 0.25%, Cu: <0.1%, Mn: 0.45~0.53%, Zn: <0.05%, Cr: 0.1~0.18%, Ti: <0.1%, C <0.1%, with the balance being aluminum and unavoidable impurities; S2. The raw materials are smelted into liquid aluminum alloy, and after refining, degassing and removing impurities, the liquid aluminum alloy is cast into aluminum alloy round ingots. S3. The aluminum alloy round ingot obtained by homogenization heat treatment S2 is heated to 430-480℃ and held for 3-5 hours, then heated to 565-580℃ and held for 7-10 hours, and then cooled to obtain homogenized aluminum alloy round ingot. S4. Heating extrusion cylinder, aluminum alloy round ingot and mold. The heating temperature of the extrusion cylinder is 420-470℃, the heating temperature of the aluminum alloy round ingot is 450-500℃, and the heating temperature of the mold is 400-450℃. S5. The barrel body profile is obtained by extrusion of aluminum alloy round ingots at an extrusion speed of 5-12 m / min. S6. Online quenching of the bucket body profile; S7. The seat bucket body profile returns to online tension straightening, with a tension rate of 0.3% to 1.2%; S8. The body profile of the toilet seat is cut to length; S9. The body profile of the toilet seat undergoes solution treatment and artificial aging. The solution treatment temperature is 530-550℃, the heat preservation time is 1-2 hours, the aging temperature is 160-200℃, and the aging time is 4-6 hours. S10. The form and position tolerances and dimensional tolerances of the seat bucket body profile are inspected. After passing the inspection, the seat bucket body profile blank is obtained.

3. The integrated design method for two-dimensional curved sheet metal reinforcement of electric bicycle aluminum seat as described in claim 1, characterized in that: The bottom plate (2) of the housing is provided with a fitting step (23) in the middle, which fits into the inner wall of the seat body (1). The fitting step (23) is provided with several strip grooves (21) and circular grooves A (22). The center of the circular groove A (22) is provided with a mounting hole A (221) and the bottom plate (2) is connected to the bottom frame by bolts. The outer ring of the bottom plate (2) is provided with several bolt connection holes A (24) for connecting to the bottom of the seat body (1).

4. The integrated design method for two-dimensional curved surface sheet metal reinforcement of electric bicycle aluminum seat as described in claim 1, characterized in that: The frame connector (3) has an opening at the front end and inside for installing the seat cushion connector (4) and inserting the battery. The end has a circular groove B (31). The center of the circular groove B (31) has an installation hole B (311) for connecting to the top frame with bolts. The inner ring has several bolt connection holes B (32) for connecting to the top of the seat bucket body (1).

5. The integrated design method for two-dimensional curved surface sheet metal reinforcement of electric bicycle aluminum seat as described in claim 1, characterized in that: The seat cushion connector (4) is a hinge structure. The part that fits against the side wall of the seat body (1) is designed to mimic the shape. The other side is provided with a hinge connection hole (41) to connect the other half of the hinge and then to the seat cushion for hinge connection. The side wall in the middle of the hinge connection hole (41) is provided with a seat cushion locking hole (42).

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