A folding vehicle

Abstract

The utility model belongs to article transport means technical field, concretely relates to a folding car. The utility model provides a folding car, aims at solving the problem of poor bearing capacity of the prior art folding car. A kind of folding car, including frame and bottom folding frame;The bottom folding frame includes center seat and connecting rod, the utility model is formed by setting center seat and top limiting part and bottom limiting plate, three-point force system, so that load distribution is more uniform, greatly improve the overall rigidity.In unfolded state, the extension of connecting rod and bottom limiting plate contact form first stress point, and rod portion and top limiting part contact form second stress point, and pivot as intermediate fulcrum, the synergistic effect of three, effectively disperses pressure, prevents local stress concentration.Compared with the traditional single-point or double-point force folding mechanism, this three-point support structure can bear greater weight, so that the frame remains stable under full load.

Description

Technical Field

[0001] This utility model belongs to the technical field of goods transportation tools, specifically relating to a folding vehicle. Background Technology

[0002] With the continuous improvement of living standards, more and more people are choosing to go outdoors with their families on weekends, and folding bikes (campers) are very convenient for carrying and transporting items. Existing folding bikes usually include a frame, a handlebar mounted on the frame, and four wheels. For the storage and folding of campervans, many campervans now have foldable frames.

[0003] Folding bicycles generally consist of a frame with an X-shaped central connector at the bottom. To fold, the frame is retracted by pulling the central connector upwards. However, this type of folding bicycle has the following drawbacks: the X-shaped central connector at the bottom of the frame is too flimsy. As the load-bearing base of the frame, the central connector is prone to bending or even collapsing when heavy items are placed inside. Summary of the Invention

[0004] This invention provides a folding vehicle designed to solve the problem of poor load-bearing capacity in existing folding vehicles.

[0005] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows: A folding bicycle, comprising a frame and a bottom folding frame; The bottom folding frame includes a center seat and a connecting rod. One end of the connecting rod is rotatably connected to the frame, and the other end of the connecting rod is rotatably connected to the center seat. The connecting rod is rotatably connected to the center seat via a pivot. The connecting rod includes a rod portion and an extension portion located at one end of the rod portion. The extension portion extends toward the center of the center seat. The pivot is located between the extension portion and the rod portion. The center seat includes a top limiting portion and a bottom limiting plate. The bottom folding frame includes an unfolded state and a folded state. When the bottom folding frame is unfolded, the lower side of the extension contacts the bottom limiting plate to form a first stress point, and the rod contacts the top limiting part on the center seat to form a second stress point. The pivot is located between the first stress point and the second stress point.

[0006] A further improved solution: The center seat is provided with a mounting groove with an opening at the lower end, a part of the rod and the extension are located in the mounting groove, and a part of the top wall of the mounting groove is the top limiting part.

[0007] Based on the above technical solution: by setting a mounting slot with an opening at the bottom of the center seat, an optimized layout and more precise force control of the connecting rod structure are achieved. The design of the mounting slot allows the rod and extension to be embedded within it, which not only improves the compactness of the overall structure but also ensures precise guidance of each component during movement. The top limiting part is directly formed by a portion of the top wall of the mounting slot. This integrated design eliminates the need for additional limiting structures, simplifies the manufacturing process, and enhances the strength of the limiting part. When the frame is unfolded, the extension contacts the bottom limiting plate, while the rod abuts against the top limiting part formed by the top wall of the mounting slot. The two work together to constrain the range of motion of the connecting rod, effectively preventing excessive displacement. This layout makes the three-point force system (bottom limiting plate, top limiting part, and pivot) work more closely together, further improving the uniformity of load distribution and structural stability. The enclosed structure of the mounting slot also reduces the entry of dust and debris into the rotating parts during daily use, reducing the risk of wear on parts and extending the service life of the folding mechanism. Overall, this design significantly enhances the load-bearing capacity and operational reliability of the frame while maintaining folding convenience.

[0008] A further improved solution: There are several mounting slots, each corresponding to a connecting rod, and the mounting slots are arranged around the outer edge of the bottom limiting plate.

[0009] Based on the above technical solution, this wraparound multi-mounting slot design significantly improves the structural rigidity and load balance of the folding bike. Multiple mounting slots, each corresponding to a connecting rod, are arranged around the outer edge of the bottom limiting plate, forming a spoke-like mechanical support structure that evenly distributes the load. Each mounting slot independently accommodates its corresponding connecting rod assembly, ensuring precise alignment and synchronization of the connecting rods during movement. The wraparound layout also enhances the overall torsional resistance of the center seat; when the frame is subjected to lateral impact, the ring-shaped support structure formed by the mounting slots better resists torsional deformation. This design also optimizes the stability of the folding process, ensuring that all connecting rods maintain a coordinated and consistent movement trajectory during folding, preventing one-sided jamming.

[0010] A further improved solution: The center seat is provided with a clearance groove for the extension to pass through, the mounting groove communicates with the clearance groove, and when the bottom folding frame is in the folded state, the extension protrudes from the upper surface of the center seat through the clearance groove.

[0011] Based on the above technical solution: By setting a clearance groove that communicates with the mounting slot, the extension of the connecting rod can naturally protrude beyond the surface of the central seat when folded. This structure allows each connecting rod to achieve a larger folding angle, thereby achieving a more thorough folding effect and significantly reducing the overall thickness in the folded state. The design of the extension protruding from the upper surface avoids spatial interference between components during folding, ensuring that each connecting rod can be folded smoothly and synchronously without jamming or misalignment. The connection structure between the clearance groove and the mounting slot forms a complete motion guide channel, ensuring both the controllability of the extension's trajectory during folding and unfolding and maintaining the structural integrity of the three-point force system. This design, while maximizing the compression of the folded volume, still ensures that all load-bearing components quickly and accurately return to their working positions when unfolded, balancing storage portability and operational reliability. The overall structure presents a more compact stacked arrangement in the folded state, making it particularly suitable for storage needs in limited spaces such as vehicle trunks.

[0012] A further improved solution: the rod and the extension are an integral structure, and the connecting rod is rotatably mounted on the frame.

[0013] Based on the above technical solution, the integrated design of the rod and extension section significantly improves the structural strength and operational stability of the folding bicycle. This integral molding structure eliminates the problems of loose connections or stress concentration that may exist in traditional split connectors, allowing force to be naturally transmitted within the rod and avoiding the risk of local fatigue fracture caused by welding or bolted connections. When the frame is unfolded and bearing weight, the integrated connecting rod can more effectively transfer the load from the rod to the extension section, and then evenly distribute it to the entire bottom folding frame through a three-point force system, significantly improving bending and torsional resistance.

[0014] A further improved solution: the connecting rod is rotatably mounted on the frame via a connecting seat.

[0015] Based on the above technical solution, the design of achieving a rotating connection through a connector significantly improves the structural stability and operational convenience of the folding bicycle. As an independent transition component between the connecting rod and the frame, the connector provides more precise rotation axis positioning, ensuring that all connecting rods maintain synchronous movement during unfolding and folding. This design allows the force to be evenly transmitted through the connector when the frame is under load, avoiding stress concentration at a single node, thereby greatly improving the overall structure's resistance to deformation. The introduction of the connector also optimizes the assembly process, enabling rapid assembly through standardized interfaces, improving production efficiency while ensuring product consistency.

[0016] A further improved solution: The frame further includes a side folding frame, which includes a first front upright and a second front upright, as well as a first rear upright and a second rear upright. The connecting seat is a connecting piece, which includes a first connecting piece disposed on the first front upright, a second connecting piece disposed on the first rear upright, a third connecting piece disposed on the second front upright, and a fourth connecting piece disposed on the second rear upright. There are four connecting rods, which are respectively a first connecting rod, a second connecting rod, a third connecting rod, and a fourth connecting rod. One end of the first connecting rod is rotatably connected to the center seat. The other end of the first connecting rod is rotatably connected to the lower end of the first front column via the first connecting piece. One end of the second connecting rod is rotatably connected to the lower end of the second front column via the third connecting piece, and the other end of the second connecting rod is rotatably connected to the center seat via a rotating shaft. One end of the third connecting rod is rotatably connected to the lower end of the first rear column via the second connecting piece, and the other end of the third connecting rod is rotatably connected to the center seat via a rotating shaft. One end of the fourth connecting rod is rotatably connected to the lower end of the second rear column via a fourth connecting rod, and the other end of the fourth connecting rod is rotatably connected to the center seat via a rotating shaft.

[0017] Based on the above technical solution: by setting four sets of independent connecting plates at the lower ends of the front and rear uprights, each connecting rod can form a precise rotational connection with the center seat and the frame, constructing a highly symmetrical three-dimensional support system. This layout enables the frame to form a stable quadrilateral force-bearing structure when unfolded. The load from the center seat can be evenly distributed to the four uprights through the four connecting rods, significantly improving overall rigidity and effectively preventing lateral torsion and local collapse. The synchronous linkage of the four connecting rods ensures coordinated and consistent folding actions, greatly optimizing both the stability of the unfolded state and the smoothness of the folding process.

[0018] A further improved solution: The side folding frame is located above the bottom folding frame. The side folding frame and the bottom folding frame cooperate to form a storage cavity for placing items. Wheels are provided at the lower ends of the first front column, the second front column, the first rear column, and the second rear column. The side folding frame also includes a first folding frame disposed between the first front column and the first rear column. A first slide is fitted onto the first front column, and a second slide is fitted onto the first rear column. The first folding frame includes a first rod, one end of which is directly rotatably connected to the upper end of the first front column. The other end of the first rod is rotatably connected to a second rod. The end of the second rod away from the first rod is rotatably connected to a third rod. The third rod is located away from the first rod. One end of the second rod is rotatably connected to the second slide. The first folding frame also includes a fourth rod rotatably connected to the first slide. The end of the fourth rod away from the first slide is rotatably connected to a fifth rod. The end of the fifth rod away from the fourth rod is rotatably connected to a sixth rod. The end of the sixth rod away from the fifth rod is directly rotatably connected to the upper end of the first rear column. The first slide is located below the connection between the first rod and the first front column. The second slide is located below the connection between the sixth rod and the first rear column. The middle part of the first rod is rotatably connected to the middle part of the fourth rod. The middle part of the second rod is rotatably connected to the middle part of the fifth rod. The middle part of the third rod is rotatably connected to the middle part of the sixth rod. The side folding frame further includes a second folding frame disposed between the second front column and the second rear column. A third slide is fitted onto the second front column, and a fourth slide is fitted onto the second rear column. The second folding frame includes a seventh rod, one end of which is directly rotatably connected to the upper end of the second front column. The other end of the seventh rod is rotatably connected to an eighth rod. The end of the eighth rod away from the seventh rod is rotatably connected to a ninth rod. The end of the ninth rod away from the eighth rod is rotatably connected to the fourth slide. The second folding frame also includes a tenth rod rotatably connected to the third slide. An eleventh rod is rotatably connected to the end of the member away from the third slide block. A twelfth rod is rotatably connected to the end of the eleventh rod away from the tenth rod. The end of the twelfth rod away from the eleventh rod is directly rotatably connected to the upper end of the second rear column. The third slide block is located below the connection between the seventh rod and the second front column. The fourth slide block is located below the connection between the twelfth rod and the second rear column. The middle part of the seventh rod is rotatably connected to the middle part of the tenth rod. The middle part of the eighth rod is rotatably connected to the middle part of the eleventh rod. The middle part of the ninth rod is rotatably connected to the middle part of the twelfth rod. The side folding frame further includes a third folding frame disposed between the first front column and the second front column. The third folding frame includes a thirteenth rod, one end of which is directly rotatably connected to the upper end of the first front column. The end of the thirteenth rod away from the first front column is rotatably connected to a fourteenth rod. The end of the fourteenth rod away from the thirteenth rod is directly rotatably connected to the upper end of the second front column. The third folding frame also includes a fifteenth rod rotatably connected to the first slide. The end of the fifteenth rod away from the first slide is rotatably connected to a sixteenth rod. The end of the sixteenth rod away from the fifteenth rod is rotatably connected to the third slide. The middle part of the thirteenth rod is rotatably connected to the middle part of the fifteenth rod, and the middle part of the fourteenth rod is rotatably connected to the middle part of the sixteenth rod.

[0019] Based on the above technical solution, the plastic connectors between the poles and the columns are eliminated, and a direct metal-to-metal rotating connection is used. This not only improves structural strength and service life but also avoids the risk of plastic parts aging and breaking. This structure is particularly suitable for bearing heavy items, and the grid-like support formed by the multi-directional poles effectively distributes pressure and prevents localized dents. The overall design, while ensuring load-bearing capacity, achieves a convenient operating experience through ingenious mechanical linkages, perfectly balancing the strength requirements for outdoor use and the portability needs for urban storage.

[0020] A further improved solution: The side folding frame further includes a fourth folding frame disposed between the first rear column and the second rear column. The fourth folding frame includes a seventeenth rod, one end of which is directly rotatably connected to the upper end of the first rear column. The end of the seventeenth rod away from the first rear column is directly rotatably connected to an eighteenth rod. The end of the eighteenth rod away from the seventeenth rod is directly rotatably connected to the upper end of the second rear column. The fourth folding frame also includes a nineteenth rod rotatably connected to the second slide block. The end of the nineteenth rod away from the second slide block is rotatably connected to a twentieth rod. The end of the twentieth rod away from the nineteenth rod is rotatably connected to the fourth slide block. The middle part of the seventeenth rod is rotatably connected to the middle part of the nineteenth rod, and the middle part of the eighteenth rod is rotatably connected to the middle part of the twentieth rod.

[0021] Based on the above technical solution, the direct rotational connection between the metal rods not only enhances the structural strength but also creates a unique force transmission path—the load is evenly distributed to the four columns through multiple sets of intersecting rods, and then transferred to the bottom folding frame. This design makes the frame particularly suitable for carrying large items, and the side walls of the entire storage compartment can provide stable support, completely eliminating the defect of side collapse in traditional designs.

[0022] A further improved solution: A handle is also provided between the first front column and the second front column. The handle is located between the first front column and the second front column via a fifth folding frame. The fifth folding frame includes a connecting seat. One end of the connecting seat is rotatably connected to a twenty-first rod, and the other end of the connecting seat is rotatably connected to a twenty-second rod. The end of the twenty-first rod away from the connecting seat is rotatably connected to the first front column via a first seat body, and the end of the twenty-second rod away from the connecting seat is rotatably connected to the second front column via a second seat body. The handle is installed on the connecting seat via a telescopic rod.

[0023] Based on the above technical solution, the addition of the telescopic rod significantly improves ease of use. The handle height can be flexibly adjusted according to the user's height, achieving a comfortable human-machine interface experience. The force applied by the handle is distributed to the two side rods through the connecting seat, and then transmitted to the front pillar, forming a complete force flow path. This design maintains the intuitive operation of a traditional handle while solving the problem of fixed handles hindering folding and storage. In the folded state, the rods are tightly stacked, minimizing the overall vehicle storage volume.

[0024] The beneficial effects of this utility model are as follows: This invention establishes a three-point force-bearing system by setting a central seat, a top limiting part, and a bottom limiting plate, resulting in a more uniform load distribution and significantly improved overall rigidity. In the unfolded state, the extension of the connecting rod contacts the bottom limiting plate to form the first force-bearing point, the rod contacts the top limiting part to form the second force-bearing point, and the pivot acts as the central fulcrum. The three components work together to effectively disperse pressure and prevent localized stress concentration. Compared to traditional single-point or double-point force-bearing folding mechanisms, this three-point support structure can withstand greater weight, ensuring the frame remains stable even under full load.

[0025] Furthermore, the combined design of the top and bottom limiting plates not only enhances compressive strength but also improves the frame's shock absorption performance. When the vehicle travels on bumpy roads, the limiting structure effectively absorbs and cushions impact forces, preventing the connecting rods from deforming or breaking due to severe shaking. Simultaneously, this design optimizes the smoothness of folding and unfolding, ensuring easy operation and preventing jamming.

[0026] This improvement makes the folding bike more durable and reliable, especially suitable for carrying heavier items such as camping gear, shopping bags, or outdoor sports equipment. Thanks to the increased strength of the bottom folding frame, users don't need to worry about structural damage from overloading, enhancing the product's practicality and safety. Furthermore, this design maintains load-bearing capacity without significantly increasing overall weight or size, preserving the convenience of folding and storing, meeting the modern consumer's demand for portability and versatility. Attached Figure Description

[0027] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For users of ordinary skills in the art, other related drawings can be obtained from these drawings without creative effort.

[0028] Figure 1 This is a front view of a folding vehicle according to this utility model.

[0029] Figure 2 This is a schematic diagram of a folding bicycle in the first direction according to the present invention.

[0030] Figure 3 This is a schematic diagram of the second direction of a folding bicycle according to this utility model.

[0031] Figure 4 yes Figure 3 Enlarged view of point A in the middle.

[0032] Figure 5 This is a schematic diagram of the center seat in the first direction of a folding vehicle according to this utility model.

[0033] Figure 6 This is a schematic diagram of the second direction of the center seat in a folding vehicle according to the present invention.

[0034] Explanation of the labels in the diagram: 1-Center seat; 2-Connecting rod; 3-Top limiting part; 4-Bottom limiting plate; 5-First stress point; 6-Second stress point; 7-Mounting groove; 8-Leaning groove; 9-First front column; 901, First connecting piece; 902, First slide block; 10-Second front column; 1001, Third connecting piece; 1002, Third slide block; 11-First rear column; 1101, Second connecting piece; 1102, Second slide block; 12-Second rear column; 1201, Fourth connecting piece; 1202, Fourth slide block; 13-First connecting rod; 14-Second connecting rod; 15-Third connecting rod; 16-Fourth connecting rod; 17-Wheel; 18-First link; 19-Second link; 20-Third link; 21-Fourth link; 22-Fifth link; 23-Sixth link; 24-Seventh link; 25-Eighth link; 26-Ninth link; 27-Tenth link; 28-Eleventh link; 29-Twelfth link; 30-Thirteenth link; 31-Fourteenth link; 32-Fifteenth link; 33-Sixteenth link; 34-Seventeenth link; 35-Eighteenth link; 36-Nineteenth link; 37-Twentieth link; 38-Handle; 39-Twenty-first link; 40-Twenty-second link; 41-Telescopic bar. Detailed Implementation

[0035] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. It should be understood that the specific embodiments described herein are merely for explaining the present utility model and are not intended to limit the present utility model. All other embodiments obtained by users of the art based on the embodiments of the present utility model without creative effort are within the protection scope of the present utility model.

[0036] refer to Figures 1 to 6 A folding bicycle, comprising a frame and a bottom folding frame; The bottom folding frame includes a center seat 1 and a connecting rod 2. One end of the connecting rod 2 is rotatably connected to the frame, and the other end of the connecting rod 2 is rotatably connected to the center seat 1. The connecting rod 2 is rotatably connected to the center seat 1 via a pivot. The connecting rod 2 includes a rod portion and an extension portion located at one end of the rod portion. The extension portion extends toward the center of the center seat 1. The pivot is located between the extension portion and the rod portion. The center seat 1 includes a top limiting portion 3 and a bottom limiting plate 4. The bottom folding frame includes an unfolded state and a folded state. When the bottom folding frame is unfolded, the lower side of the extension contacts the bottom limiting plate 4 to form a first force-bearing point 5, and the rod contacts the top limiting part 3 on the center seat 1 to form a second force-bearing point 6. The rotating shaft is located between the first force-bearing point 5 and the second force-bearing point 6.

[0037] Specifically: The center seat 1 is provided with a mounting groove 7 with an opening at the lower end. A portion of the rod and the extension are located within the mounting groove 7, and a portion of the top wall of the mounting groove 7 forms the top limiting part 3. There are several mounting grooves 7, each corresponding to a connecting rod 2, and the mounting grooves 7 surround the outer edge of the bottom limiting plate 4. The center seat 1 is provided with a clearance groove 8 through which the extension passes. The mounting groove 7 communicates with the clearance groove 8. When the bottom folding frame is folded, the extension protrudes from the upper surface of the center seat 1 through the clearance groove 8. The rod and the extension are an integral structure, and the connecting rod 2 is rotatably mounted on the frame. The connecting rod 2 is rotatably mounted on the frame via a connecting seat. The frame also includes a side folding frame, which includes a first front upright 9 and a second front upright 10. The side folding frame also includes a first rear upright 11 and a second rear upright 12. The connecting seat is a connecting piece, which includes a first connecting piece 901 disposed on the first front upright 9, a second connecting piece 1101 disposed on the first rear upright 11, a third connecting piece 1001 disposed on the second front upright 10, and a fourth connecting piece 1201 disposed on the second rear upright 12. There are four connecting rods 2, which are a first connecting rod 13, a second connecting rod 14, a third connecting rod 15, and a fourth connecting rod 16. One end of the first connecting rod 13 is rotatably connected to the center seat 1. The other end of the first connecting rod 13 is rotatably connected to the lower end of the first front column 9 via the first connecting piece 901. One end of the second connecting rod 14 is rotatably connected to the lower end of the second front column 10 via the third connecting piece 1001, and the other end of the second connecting rod 14 is rotatably connected to the center seat 1 via a rotating shaft. One end of the third connecting rod 15 is rotatably connected to the lower end of the first rear column 11 via the second connecting piece 1101, and the other end of the third connecting rod 15 is rotatably connected to the center seat 1 via a rotating shaft. One end of the fourth connecting rod 16 is rotatably connected to the lower end of the second rear column 12 via the fourth connecting rod 16, and the other end of the fourth connecting rod 16 is rotatably connected to the center seat 1 via a rotating shaft. The first connecting piece 901 can be welded to the first front column 9, and the fixing method of the other connecting pieces is the same as the fixing method of the first connecting piece 901. The mounting slots 7 of the center seat 1 adopt a radial annular layout. Four mounting slots 7, which precisely match the connecting rods 2, are evenly distributed around the bottom limiting plate 4. Each mounting slot 7 precisely accommodates the one-piece molded connecting rod 2 assembly, ensuring smooth protrusion of the extension when folded, without affecting the limiting contact when unfolded. The connecting piece is fixed to the inside of the column using laser welding technology. The weld joint between the first connecting piece 901 and the first front column 9 is polished to ensure a smooth, burr-free surface.

[0038] Wherein: the side folding frame is located above the bottom folding frame, and the side folding frame cooperates with the bottom folding frame to form a storage cavity for placing items. The lower ends of the first front column 9, the second front column 10, the first rear column 11, and the second rear column 12 are all provided with wheels 17. The side folding frame also includes a first folding frame disposed between the first front column 9 and the first rear column 11. A first slide 902 is sleeved on the first front column 9, and a second slide 1102 is sleeved on the first rear column 11. The first folding frame includes a first rod 18, one end of which is directly rotatably connected to the upper end of the first front column 9. The other end of the first rod 18 is rotatably connected to a second rod 19. The end of the second rod 19 away from the first rod 18 is rotatably connected to a third rod 20. The end of the third rod 20 away from the second rod 19 is rotatably connected to... Connected to the second slide 1102, the first folding frame further includes a fourth rod 21 rotatably connected to the first slide 902. A fifth rod 22 is rotatably connected to the end of the fourth rod 21 away from the first slide 902. A sixth rod 23 is rotatably connected to the end of the fifth rod 22 away from the fourth rod 21. The end of the sixth rod 23 away from the fifth rod 22 is directly rotatably connected to the upper end of the first rear column 11. The first slide 902 is located below the connection between the first rod 18 and the first front column 9. The second slide 1102 is located below the connection between the sixth rod 23 and the first rear column 11. The middle part of the first rod 18 is rotatably connected to the middle part of the fourth rod 21. The middle part of the second rod 19 is rotatably connected to the middle part of the fifth rod 22. The middle part of the third rod 20 is rotatably connected to the middle part of the sixth rod 23. The side folding frame further includes a second folding frame disposed between the second front column 10 and the second rear column 12. A third slide 1002 is fitted onto the second front column 10, and a fourth slide 1202 is fitted onto the second rear column 12. The second folding frame includes a seventh rod 24, one end of which is directly rotatably connected to the upper end of the second front column 10. The other end of the seventh rod 24 is rotatably connected to an eighth rod 25. The end of the eighth rod 25 away from the seventh rod 24 is rotatably connected to a ninth rod 26. The end of the ninth rod 26 away from the eighth rod 25 is rotatably connected to the... On the fourth slide 1202, the second folding frame further includes a tenth rod 27 rotatably connected to the third slide 1002. An eleventh rod 28 is rotatably connected to the end of the tenth rod 27 away from the third slide 1002. An eleventh rod 28 is rotatably connected to the end of the eleventh rod 28 away from the tenth rod 27. A twelfth rod 29 is rotatably connected to the upper end of the second rear column at the end of the twelfth rod 29 away from the eleventh rod 28. The third slide 1002 is located below the connection point between the seventh rod 24 and the second front column 10. The fourth slide 1202 is located between the twelfth rod 29 and the... Below the connection point of the second rear column 12, the middle part of the seventh rod 24 is rotatably connected to the middle part of the tenth rod 27, the middle part of the eighth rod 25 is rotatably connected to the middle part of the eleventh rod 28, and the middle part of the ninth rod 26 is rotatably connected to the middle part of the twelfth rod 29; the side folding frame also includes a third folding frame disposed between the first front column 9 and the second front column 10, the third folding frame including a thirteenth rod 30, one end of the thirteenth rod 30 being directly rotatably connected to the upper end of the first front column 9, and the end of the thirteenth rod 30 away from the first front column 9 being rotatably connected to the first... The fourteenth rod 31 is directly rotatably connected to the upper end of the second front column 10 at one end away from the thirteenth rod 30. The third folding frame also includes a fifteenth rod 32 rotatably connected to the first slide 902. A sixteenth rod 33 is rotatably connected to the end of the fifteenth rod 32 away from the first slide 902. The end of the sixteenth rod 33 away from the fifteenth rod 32 is rotatably connected to the third slide 1002. The middle part of the thirteenth rod 30 is rotatably connected to the middle part of the fifteenth rod 32, and the middle part of the fourteenth rod 31 is rotatably connected to the middle part of the sixteenth rod.The side folding frame further includes a fourth folding frame disposed between the first rear column 11 and the second rear column 12. The fourth folding frame includes a seventeenth rod 34, one end of which is directly rotatably connected to the upper end of the first rear column 11. The end of the seventeenth rod 34 away from the first rear column 11 is directly rotatably connected to an eighteenth rod 35. The end of the eighteenth rod 35 away from the seventeenth rod 34 is directly rotatably connected to the upper end of the second rear column 12. The fourth folding frame also includes a nineteenth rod 36 rotatably connected to the second slide 1102. The end of the nineteenth rod 36 away from the second slide 1102 is rotatably connected to a twentieth rod 37. The end of the twentieth rod 37 away from the nineteenth rod 36 is rotatably connected to the fourth slide 1202. The middle part of the seventeenth rod 34 is rotatably connected to the middle part of the nineteenth rod 36, and the middle part of the eighteenth rod 35 is rotatably connected to the middle part of the twentieth rod 37. A handle 38 is also provided between the first front column 9 and the second front column 10. The handle 38 is located between the first front column 9 and the second front column 10 via a fifth folding frame. The fifth folding frame includes a connecting seat. One end of the connecting seat is rotatably connected to a twenty-first rod 39, and the other end of the connecting seat is rotatably connected to a twenty-second rod 40. The end of the twenty-first rod 39 away from the connecting seat is rotatably connected to the first front column 9 via a first seat body, and the end of the twenty-second rod 40 away from the connecting seat is rotatably connected to the second front column 10 via a second seat body. The handle 38 is installed on the connecting seat via a telescopic rod 41. Each rotation node is reliably connected via a precision-machined cylindrical shaft. The shaft adopts a high-strength alloy steel riveted shaft design, and the two ends of the shaft are riveted joints formed by cold forging process, with a diameter slightly larger than the shaft body by 1.2-1.5mm. During assembly, they are pressed and fixed by a hydraulic riveting machine to form a permanent mechanical lock. This structure eliminates the need for additional nuts or retainers, ensuring smooth rotation of the parts while completely eliminating the risk of shaft loosening during use. At critical load-bearing points, such as the connection between the slide and the rod, the shaft surface undergoes carburizing and quenching treatment, resulting in higher surface hardness, while the core maintains good toughness, giving the shaft both excellent wear resistance and impact resistance.

[0039] The working principle of this embodiment: When the frame unfolds and carries a heavy load, gravity is transferred through the frame to the bottom folding frame. At this point, the extension of connecting rod 2 comes into close contact with the bottom limiting plate 4, forming the first stress point and bearing the main vertical pressure. Simultaneously, the rod portion of connecting rod 2 experiences an upward reaction force, causing it to contact the top limiting part 3, forming the second stress point and limiting further rotation of the rod. The pivot acts as a central fulcrum, balancing the torques on both sides and maintaining the dynamic stability of the entire structure. This three-point force distribution ensures that the load is not concentrated in a single area but is distributed to multiple support points through leverage. Specifically, the contact between the extension and the bottom limiting plate 4 prevents connecting rod 2 from sinking, while the presence of the top limiting part 3 prevents the rod from excessively rising, and the pivot acts as a pivot point coordinating the movement of both. This synergistic effect allows the components to remain rigidly connected even when the frame bears a large weight, preventing deformation or breakage due to uneven stress.

[0040] In the folded state, the user simply pulls up the center seat 1, causing the extension of the connecting rod 2 to disengage from the bottom limiting plate 4. The rod then rotates around the pivot, causing the entire bottom folding frame to fold inward. Thanks to the precise fit between the top limiting part 3 and the bottom limiting plate 4, the folding process is smooth and the structure is compact, occupying minimal space. To unfold, simply press down on the frame; the connecting rod 2 automatically resets, and the extension re-fits the bottom limiting plate 4, restoring the three-point load-bearing state and ensuring the frame immediately has high load-bearing capacity.

[0041] This utility model is not limited to the above-mentioned optional embodiments. Under the premise of non-contradiction, the various solutions can be combined arbitrarily. Anyone can derive other forms of products under the guidance of this utility model. However, no matter what changes are made in their shape or structure, all technical solutions that fall within the scope of the claims of this utility model are within the protection scope of this utility model.

Claims

1. A folding bicycle, characterized in that: Including the frame and bottom folding rack; The bottom folding frame includes a center seat and a connecting rod. One end of the connecting rod is rotatably connected to the frame, and the other end of the connecting rod is rotatably connected to the center seat. The connecting rod is rotatably connected to the center seat via a pivot. The connecting rod includes a rod portion and an extension portion located at one end of the rod portion. The extension portion extends toward the center of the center seat. The pivot is located between the extension portion and the rod portion. The center seat includes a top limiting portion and a bottom limiting plate. The bottom folding frame includes an unfolded state and a folded state. When the bottom folding frame is unfolded, the lower side of the extension contacts the bottom limiting plate to form a first stress point, and the rod contacts the top limiting part on the center seat to form a second stress point. The pivot is located between the first stress point and the second stress point.

2. A folding bicycle according to claim 1, characterized in that: The center seat is provided with a mounting groove with an opening at the lower end. A part of the rod and the extension are located in the mounting groove, and a part of the top wall of the mounting groove is the top limiting part.

3. A folding bicycle according to claim 2, characterized in that: There are several mounting slots, each corresponding to a connecting rod, and the mounting slots are arranged around the outer edge of the bottom limiting plate.

4. A folding bicycle according to claim 3, characterized in that: The center seat is provided with a clearance groove for the extension to pass through. The mounting groove communicates with the clearance groove. When the bottom folding frame is folded, the extension protrudes from the upper surface of the center seat through the clearance groove.

5. A folding bicycle according to claim 4, characterized in that: The rod and the extension are an integral structure, and the connecting rod is rotatably mounted on the frame.

6. A folding bicycle according to claim 5, characterized in that: The connecting rod is rotatably mounted on the vehicle frame via a connecting seat.

7. A folding bicycle according to claim 6, characterized in that: The frame also includes a side folding frame, which includes a first front upright and a second front upright, as well as a first rear upright and a second rear upright. The connecting seat is a connecting piece, which includes a first connecting piece on the first front upright, a second connecting piece on the first rear upright, a third connecting piece on the second front upright, and a fourth connecting piece on the second rear upright. There are four connecting rods, namely a first connecting rod, a second connecting rod, a third connecting rod, and a fourth connecting rod. One end of the first connecting rod is rotatably connected to the center seat. The other end of the connecting rod is rotatably connected to the lower end of the first front column via the first connecting piece. One end of the second connecting rod is rotatably connected to the lower end of the second front column via the third connecting piece. The other end of the second connecting rod is rotatably connected to the center seat via a rotating shaft. One end of the third connecting rod is rotatably connected to the lower end of the first rear column via the second connecting piece. The other end of the third connecting rod is rotatably connected to the center seat via a rotating shaft. One end of the fourth connecting rod is rotatably connected to the lower end of the second rear column via a fourth connecting rod. The other end of the fourth connecting rod is rotatably connected to the center seat via a rotating shaft.

8. A folding bicycle according to claim 7, characterized in that: The side folding frame is located above the bottom folding frame. The side folding frame and the bottom folding frame cooperate to form a storage cavity for placing items. Wheels are provided at the lower ends of the first front column, the second front column, the first rear column, and the second rear column. The side folding frame also includes a first folding frame disposed between the first front column and the first rear column. A first slide is fitted onto the first front column, and a second slide is fitted onto the first rear column. The first folding frame includes a first rod, one end of which is directly rotatably connected to the upper end of the first front column. The other end of the first rod is rotatably connected to a second rod. The end of the second rod away from the first rod is rotatably connected to a third rod. The third rod is located away from the second rod. One end of the first folding frame is rotatably connected to the second slide. The first folding frame also includes a fourth rod rotatably connected to the first slide. The end of the fourth rod away from the first slide is rotatably connected to a fifth rod. The end of the fifth rod away from the fourth rod is rotatably connected to a sixth rod. The end of the sixth rod away from the fifth rod is directly rotatably connected to the upper end of the first rear column. The first slide is located below the connection between the first rod and the first front column. The second slide is located below the connection between the sixth rod and the first rear column. The middle part of the first rod is rotatably connected to the middle part of the fourth rod. The middle part of the second rod is rotatably connected to the middle part of the fifth rod. The middle part of the third rod is rotatably connected to the middle part of the sixth rod. The side folding frame further includes a second folding frame disposed between the second front column and the second rear column. A third slide is fitted onto the second front column, and a fourth slide is fitted onto the second rear column. The second folding frame includes a seventh rod, one end of which is directly rotatably connected to the upper end of the second front column. The other end of the seventh rod is rotatably connected to an eighth rod. The end of the eighth rod away from the seventh rod is rotatably connected to a ninth rod. The end of the ninth rod away from the eighth rod is rotatably connected to the fourth slide. The second folding frame also includes a tenth rod rotatably connected to the third slide. An eleventh rod is rotatably connected to the end of the member away from the third slide block. A twelfth rod is rotatably connected to the end of the eleventh rod away from the tenth rod. The end of the twelfth rod away from the eleventh rod is directly rotatably connected to the upper end of the second rear column. The third slide block is located below the connection between the seventh rod and the second front column. The fourth slide block is located below the connection between the twelfth rod and the second rear column. The middle part of the seventh rod is rotatably connected to the middle part of the tenth rod. The middle part of the eighth rod is rotatably connected to the middle part of the eleventh rod. The middle part of the ninth rod is rotatably connected to the middle part of the twelfth rod. The side folding frame further includes a third folding frame disposed between the first front column and the second front column. The third folding frame includes a thirteenth rod, one end of which is directly rotatably connected to the upper end of the first front column. The end of the thirteenth rod away from the first front column is rotatably connected to a fourteenth rod. The end of the fourteenth rod away from the thirteenth rod is directly rotatably connected to the upper end of the second front column. The third folding frame also includes a fifteenth rod rotatably connected to the first slide. The end of the fifteenth rod away from the first slide is rotatably connected to a sixteenth rod. The end of the sixteenth rod away from the fifteenth rod is rotatably connected to the third slide. The middle part of the thirteenth rod is rotatably connected to the middle part of the fifteenth rod, and the middle part of the fourteenth rod is rotatably connected to the middle part of the sixteenth rod.

9. A folding bicycle according to claim 8, characterized in that: The side folding frame further includes a fourth folding frame disposed between the first rear column and the second rear column. The fourth folding frame includes a seventeenth rod, one end of which is directly rotatably connected to the upper end of the first rear column. The end of the seventeenth rod away from the first rear column is directly rotatably connected to an eighteenth rod. The end of the eighteenth rod away from the seventeenth rod is directly rotatably connected to the upper end of the second rear column. The fourth folding frame also includes a nineteenth rod rotatably connected to the second slide. The end of the nineteenth rod away from the second slide is rotatably connected to a twentieth rod. The end of the twentieth rod away from the nineteenth rod is rotatably connected to the fourth slide. The middle part of the seventeenth rod is rotatably connected to the middle part of the nineteenth rod, and the middle part of the eighteenth rod is rotatably connected to the middle part of the twentieth rod.

10. A folding bicycle according to claim 7, characterized in that: A handle is also provided between the first front column and the second front column. The handle is located between the first front column and the second front column via a fifth folding frame. The fifth folding frame includes a connecting seat. One end of the connecting seat is rotatably connected to a twenty-first rod, and the other end of the connecting seat is rotatably connected to a twenty-second rod. The end of the twenty-first rod away from the connecting seat is rotatably connected to the first front column via a first seat body, and the end of the twenty-second rod away from the connecting seat is rotatably connected to the second front column via a second seat body. The handle is installed on the connecting seat via a telescopic rod.

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