Novel electric bicycle frame

Abstract

The utility model relates to a novel electric bicycle frame. Comprising side plates, a bicycle head pipe, a cushion mounting seat and a rear fork, the side plate is of a plate structure which is integrally punched and formed; two groups of symmetrically placed side plates are connected to the headstock pipe; cushion mounting seats are connected to the tops of the rear sides of the two side plates; rear bottom forks are connected to the bottom ends of the rear sides of the two side plates; a front battery compartment mounting seat and a rear battery compartment mounting seat are connected between the bottom ends of the two groups of side plates; and a battery compartment is mounted on the front battery compartment mounting seat and the rear battery compartment mounting seat. The problems that in the prior art, an electric vehicle frame mostly adopts a round pipe welding forming technology, the number of welding joints is large, production procedures are increased, the welding joints are prone to becoming structural weak points due to stress concentration, the overall strength and durability of the frame are affected, and meanwhile the redundant weight is large due to the linear structural design of round pipes, and the cost is low are solved. And the limitation of the weight of the whole electric bicycle and the limitation of the weight of a plastic part by the latest national standard GB17761-2024 issued by the country are difficult to meet.

Description

Technical Field

[0001] This utility model relates to the field of electric vehicles, and in particular to a novel electric bicycle frame. Background Technology

[0002] With the rapid development of the electric vehicle industry and the implementation of the newly promulgated national standard GB17761-2024, lightweighting, high strength, plastic restriction, and product safety have become the standards for electric bicycle frame design. Currently, most mainstream electric bicycle frames on the market use a round tube welding process. While this type of structure, formed by welding multiple sections of tubing together, possesses a certain load-bearing capacity, it has significant drawbacks: First, the numerous weld joints not only increase production processes and manufacturing costs, but also make the weld joints prone to stress concentration, becoming weak points in the structure and affecting the overall strength and durability of the frame; second, the linear structural design of the round tubes themselves results in low material utilization and significant redundant weight, making it difficult to meet the requirements of the newly promulgated national standard GB17761-2024 regarding the weight limits for the entire electric bicycle and the weight limits for plastic components. In addition, existing technologies often require the addition of external plastic coverings to address issues such as excessive frame weight and aesthetic shortcomings. However, an excessively high proportion of plastic parts would violate the weight limits for plastic parts stipulated in the latest national standard GB17761-2024, creating a mutually restrictive technical contradiction.

[0003] To address the aforementioned issues, the industry urgently needs a novel frame design solution that, while ensuring structural strength, significantly reduces frame weight and reliance on plastic components through optimized material selection and structural design. Based on this, this invention proposes replacing traditional round tubing with high-strength steel plates, employing integrated stamping technology combined with a symmetrical split structure design. This fundamentally solves the problems of complex welding processes, excessive vehicle weight, and excessive plastic component weight in existing technologies. Utility Model Content

[0004] This application provides a novel electric bicycle frame that solves the problems of existing electric bicycle frames, which mostly use round tubes welded together. This results in a large number of weld seams, increasing production processes and manufacturing costs. Furthermore, the weld seams are prone to stress concentration, becoming structural weak points that affect the overall strength and durability of the frame. In addition, the linear structure of the round tubes themselves leads to a large amount of redundant weight, making it difficult to meet the technical problems of the latest national standard GB17761-2024 regarding the weight limits of electric bicycles and plastic parts.

[0005] The technical solution adopted in the embodiments of this application is as follows:

[0006] A novel electric bicycle frame includes side panels, a head tube, a seat mounting base, and a rear swingarm. The side panels are integrally stamped sheet metal structures. Two sets of symmetrically arranged side panels are connected to the head tube. The seat mounting base is connected to the top rear side of the two sets of side panels. The rear swingarm is connected to the bottom rear side of the two sets of side panels. A front battery compartment mounting base and a rear battery compartment mounting base are connected between the bottom ends of the two sets of side panels. Battery compartments are mounted on the front and rear battery compartment mounting bases. A shock-absorbing tube is connected between the top rear side of the two sets of side panels, and the shock-absorbing tube is located below the seat mounting base. A shock-absorbing mounting base is connected to the shock-absorbing tube. A rear swingarm shock-absorbing mounting base is mounted on the rear swingarm.

[0007] A further technical solution is as follows: a luggage rack mounting seat is connected between the rear top ends of the two sets of side plates, and the luggage rack mounting seat is located on the rear side of the shock absorber tube.

[0008] A further technical solution is as follows: a controller mounting base is connected between the bottom ends of the two sets of side plates, and the controller mounting base is located above the rear horizontal fork.

[0009] A further technical solution is as follows: a side support mounting seat is connected to the bottom end of one of the side plates; the side support mounting seat is used for side support.

[0010] A further technical solution is that the rear flat fork is provided with two sets of mudplate mounting seats arranged symmetrically.

[0011] A further technical solution is that the side plate is made of high-strength steel.

[0012] One or more technical solutions provided in the embodiments of this application have at least the following technical effects or advantages:

[0013] 1. By employing two sets of symmetrically distributed side panels, head tube, seat mount, rear swingarm, front battery compartment mount, rear battery compartment mount, shock absorber tube, and shock absorber mount, and by using high-strength steel sheet for the side panels in a single stamping process instead of the traditional multi-segment round tube welded structure, the number of welds is reduced (e.g., the laser welding between the head tube and the side panel requires only a single weld), reducing the risk of stress concentration. This results in a lighter overall frame weight, meeting the requirements of the latest national standard GB17761-2024 for the weight limits of electric bicycles and plastic parts. The U-shaped groove design of the front and rear battery compartment mounts enables quick positioning and installation of the battery compartment; the groove structure of the controller mount and the flanged process of the side support mounts simplify the assembly steps and improve production efficiency. Symmetrically distributed side plates, shock absorber tubes, and rear swingarm shock absorber mounts form a damping system that disperses road impact loads. The reinforced design of the luggage rack mounts enhances the frame's torsional rigidity, reduces the need for plastic components, and meets the new standard's weight requirements for plastic parts. Mudguard mounts are symmetrically positioned on both sides of the rear swingarm, avoiding uneven stress distribution caused by traditional single-sided mudguard mounting. The vertical layout of the shock absorber tubes and seat mounts optimizes frame space utilization, balancing ride comfort with a rational component layout. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the overall structure of a novel electric bicycle frame according to an embodiment of the present invention.

[0015] Figure 2 This is a schematic diagram illustrating a portion of the structure of the rear side panel in an embodiment of this utility model.

[0016] In the diagram: 1. Side panel; 11. Front battery compartment mounting bracket; 12. Rear battery compartment mounting bracket; 13. Battery compartment; 2. Head tube; 3. Seat mounting bracket; 4. Rear swingarm; 41. Rear swingarm shock absorber mounting bracket; 42. Mudguard mounting bracket; 5. Shock absorber tube; 51. Shock absorber mounting bracket; 6. Luggage rack mounting bracket; 7. Controller mounting bracket; 8. Side support mounting bracket. Detailed Implementation

[0017] This application provides a novel electric bicycle frame that solves the problems of existing electric bicycle frames, which mostly use round tubes welded together. This results in a large number of weld seams, increasing production processes and manufacturing costs. Furthermore, the weld seams are prone to stress concentration, becoming structural weak points that affect the overall strength and durability of the frame. In addition, the linear structure of the round tubes themselves leads to a large amount of redundant weight, making it difficult to meet the technical problems of the latest national standard GB17761-2024 regarding the weight limits of electric bicycles and plastic parts.

[0018] The technical solution in this application is to solve the above problems, and the overall approach is as follows:

[0019] To better understand the above technical solutions, the following will provide a detailed explanation of the technical solutions in conjunction with the accompanying drawings and specific implementation methods.

[0020] A new type of electric bicycle frame, such as Figure 1 and Figure 2 As shown, the system includes side panels 1, a head tube 2, a seat mounting base 3, and a rear swingarm 4. The side panels 1 are a one-piece stamped sheet metal structure. Two sets of symmetrically arranged side panels 1 are connected to the head tube 2. The seat mounting base 3 is connected to the top rear side of the two sets of side panels 1. The rear swingarm 4 is connected to the bottom rear side of the two sets of side panels 1. A front battery compartment mounting base 11 and a rear battery compartment mounting base 12 are connected between the bottom ends of the two sets of side panels 1. Battery compartments 13 are mounted on the front battery compartment mounting base 11 and the rear battery compartment mounting base 12. A shock absorber tube 5 is connected between the top rear side of the two sets of side panels 1, and the shock absorber tube 5 is located below the seat mounting base 3. A shock absorber mounting base 51 is connected to the shock absorber tube 5. A rear swingarm shock absorber mounting base 41 is mounted on the rear swingarm 4.

[0021] A luggage rack mounting seat 6 is connected between the top rear sides of the two sets of side panels 1, and the luggage rack mounting seat 6 is located behind the shock absorber tube 5.

[0022] A controller mounting base 7 is connected between the bottom ends of the two sets of side plates 1, and the controller mounting base 7 is located above the rear horizontal fork 4.

[0023] One of the side plates 1 has a side support mounting base 8 connected to its bottom end. The side support mounting base 8 is used for side support.

[0024] The rear horizontal fork 4 is equipped with two sets of mudguards 42 arranged symmetrically.

[0025] Side plate 1 is made of high-strength steel.

[0026] The side plate 1 is made of high-strength steel sheet and is stamped in one piece. Its front end is fixedly connected to the head tube 2 by laser welding to form the front support structure of the frame. The top of the rear side of the two sets of side plates 1 is connected to the seat mounting base 3 by welding, and the bottom is fixed to the rear swingarm 4 by riveting. Mudguard mounting bases 42 are symmetrically arranged on both sides of the rear swingarm 4 for installing mudguards.

[0027] A front battery compartment mounting base 11 and a rear battery compartment mounting base 12 are welded between the bottom ends of the side plates 1. Both mounting bases are formed into U-shaped groove structures by stamping and bending. The battery compartment 13 is fastened to the front battery compartment mounting base 11 and the rear battery compartment mounting base 12 by bolts. A shock-absorbing tube 5 is welded between the rear top ends of the side plates 1. The shock-absorbing tube 5 is located below the seat mounting base 3, and a shock-absorbing mounting base 51 is welded to its surface. A rear swingarm 4 is provided with a rear swingarm shock-absorbing mounting base 41, and shock absorbers are installed between the rear swingarm shock-absorbing mounting base 41 and the shock-absorbing mounting base 51. Multiple shock absorbers can be installed to improve driving stability. Furthermore, a luggage rack mounting base 6 is welded between the rear top ends of the two sets of side plates 1. It is located behind the shock-absorbing tube 5 and connected to the side plates 1 by reinforcing ribs to enhance load-bearing capacity. A controller mounting base 7 is also provided between the bottom ends of the side plates 1. It is formed into a groove structure by stamping and then welded for fixing, and is used to install the electric vehicle controller. One of the side plates 1 extends from the bottom end to a side support mounting base 8, which uses a partial stamping and flanging process to form mounting holes to fit standard foot support components.

[0028] By employing two sets of symmetrically distributed side plates 1, head tube 2, seat mounting base 3, rear swingarm 4, front battery compartment mounting base 11, rear battery compartment mounting base 12, shock absorber tube 5, and shock absorber mounting base 51, and by using high-strength steel plate for the side plate 1 as a single piece of stamped material instead of the traditional multi-segment round tube welded structure, the number of welds is reduced (e.g., the laser welding between the head tube 2 and the side plate 1 requires only a single weld), reducing the risk of stress concentration and thus reducing the overall weight of the frame. This meets the requirements of the latest national standard GB17761-2024 for the weight limits of electric bicycles and plastic parts. The U-shaped groove design of the front battery compartment mounting base 11 and the rear battery compartment mounting base 12 enables quick positioning and installation of the battery compartment 13; the groove structure of the controller mounting base 7 and the flanged process of the side support mounting base 8 simplify the component assembly steps and improve production efficiency. The symmetrically distributed side plates 1, shock absorber tubes 5, and rear swingarm shock absorber mounting brackets 41 form a shock absorption system through the installation of a centrally mounted shock absorber, dispersing road impact loads. The reinforcing rib design of the luggage rack mounting bracket 6 improves the frame's torsional rigidity, reduces the need for plastic parts, and meets the new regulations' requirements for plastic part weight. Mudguard mounting brackets 42 are symmetrically arranged on both sides of the rear swingarm 4, avoiding uneven stress caused by traditional single-sided mudguard mounting. The vertical layout of the shock absorber tubes 5 and seat mounting brackets 3 optimizes the utilization of frame space, balancing riding comfort and component layout rationality.

[0029] Although preferred embodiments of the present invention have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments as well as all changes and modifications falling within the scope of the present invention.

[0030] Obviously, those skilled in the art can make various modifications and variations to this utility model without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this utility model and their equivalents, this utility model also intends to include these modifications and variations.

Claims

1. A new type of electric bicycle frame, comprising side plates (1), a head tube (2), a seat cushion mounting seat (3), and a rear flat fork (4); characterized in that, The side plate (1) is an integral stamping plate structure; the head pipe (2) is connected with two groups of symmetrical side plates (1); the rear top of the two groups of side plates (1) is connected with the cushion mounting seat (3); the rear bottom of the two groups of side plates (1) is connected with the rear fork (4); the bottom between the two groups of side plates (1) is connected with the front battery compartment mounting seat (11) and the rear battery compartment mounting seat (12); the front battery compartment mounting seat (11) and the rear battery compartment mounting seat (12) are installed with the battery compartment (13); the top between the rear of the two groups of side plates (1) is connected with the shock absorbing pipe (5), and the shock absorbing pipe (5) is located below the cushion mounting seat (3); the shock absorbing pipe (5) is connected with the shock absorbing mounting seat (51); the rear fork (4) is installed with the rear fork shock absorbing mounting seat (41).

2. A new electric bicycle frame as claimed in claim 1, characterized by, The top between the rear of the two groups of side plates (1) is connected with the luggage rack mounting seat (6), and the luggage rack mounting seat (6) is located at the rear of the shock absorbing pipe (5).

3. A new electric bicycle frame as claimed in claim 2, characterized by, The bottom between the two groups of side plates (1) is connected with the controller mounting seat (7), and the controller mounting seat (7) is located above the rear fork (4).

4. A new electric bicycle frame as claimed in claim 3, characterized by, One group of the bottom of the side plate (1) is connected with the side support mounting seat (8); the side support mounting seat (8) is used for side support.

5. A new electric bicycle frame as claimed in claim 4, characterized by, The rear fork (4) is provided with two groups of symmetrical mud plate mounting seats (42).

6. A new electric bicycle frame as claimed in claim 5, characterized by, The side plate (1) is made of high-strength steel.

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