Double-layered edge pipe composite type bending beam type high-strength vehicle frame

Abstract

The utility model provides a kind of double-layer edge pipe composite type bending beam high-strength frame, it is related to electric bicycle accessory technical field, solve the technical problem that the conventional frame bending resistance and torsional stiffness are insufficient in prior art, prone to deformation and vibration, affect the sense of riding safety and the service life of frame.The device includes upper edge pipe, lower edge pipe and main beam pipe, wherein, the front end of lower edge pipe is provided with the bending structure towards the direction of main beam pipe and inclined upwards, the free end of bending structure is fixedly connected with the side wall of main beam pipe, the front end of upper edge pipe is provided with the bending structure towards the direction of main beam pipe and bending, the free end of bending structure is fixedly connected with the side wall of bending structure, upper edge pipe rear end and the rear end area of lower edge pipe are fixedly connected and upper edge pipe and lower edge pipe form edge beam structure, two edge beam structures are symmetrically arranged and main beam pipe is located on symmetry plane.

Description

Technical Field

[0001] This utility model relates to the field of electric bicycle parts technology, and in particular to a double-layer side tube composite curved beam high-strength frame. Background Technology

[0002] Traditional bicycle frames generally offer poor riding stability, are prone to instability at high speeds, and have limited space for the battery compartment and overall vehicle layout. Side tube assemblies often use round tubes or small square tubes of a single diameter and wall thickness, resulting in limited material usage. When faced with the greater weight of electric vehicles, motor torque, and complex road conditions, they lack sufficient bending and torsional stiffness, making them prone to deformation and vibration, affecting riding safety and frame lifespan. Simple side tube assemblies also struggle to optimally distribute stress, and the strength of critical connections often relies on localized thickening rather than optimization through overall structural design, making it difficult to balance lightweight design with strength. Therefore, there is an urgent need in this field for a new frame structure that can guarantee lightweight, excellent stability, stiffness, and strength while accommodating large-capacity batteries. Utility Model Content

[0003] The purpose of this invention is to provide a double-layer side-tube composite bending beam high-strength bicycle frame to solve the technical problems of insufficient bending and torsional stiffness in existing bicycle frames, which easily lead to deformation and vibration, affecting riding safety and frame life. The various technical effects of the preferred technical solutions provided by this invention are detailed below.

[0004] To achieve the above objectives, the present invention provides the following technical solution: This utility model provides a double-layer side tube composite curved beam high-strength vehicle frame, including an upper side tube, a lower side tube, and a main beam tube. The front end of the lower side tube is provided with a bending structure that faces the main beam tube and is inclined upward. The free end of the bending structure is fixedly connected to the side wall of the main beam tube. The front end of the upper side tube is provided with a bending structure that faces the main beam tube and is bent. The free end of the bending structure is fixedly connected to the side wall of the bending structure. The rear end of the upper side tube is fixedly connected to the rear end region of the lower side tube, and the upper side tube and the lower side tube together form a side beam structure. The two side beam structures are symmetrically arranged, and the main beam tube is located on the plane of symmetry.

[0005] Optionally, it also includes a reinforcing plate, which is fixed to the side wall of the bent structure, and the free end of the bent structure is fixedly connected to the reinforcing plate.

[0006] Optionally, it also includes a transverse tube, the two ends of which are fixedly connected to parallel sections on the two lower tubes respectively, and the lower end of the main beam tube is provided with a backward-curved arc-shaped section, the free end of which is fixedly connected to the middle side wall of the transverse tube.

[0007] Optionally, it also includes a reinforcing frame, the middle region of which is fixedly connected to the upper sidewall of the arc-shaped curved section, and the two ends of which are fixedly connected to the sidewalls of the two curved structures respectively.

[0008] Optionally, the bending structure includes a flat section and a first bending section. The flat section is vertically arranged and has an arc-shaped flat structure. The upper end of the first bending section is fixedly connected to the lower end of the flat section, and the connection between the first bending section and the flat section is an arc-shaped structure. The flat section is fixedly connected to the side wall of the main beam tube, and the side wall of the first bending section is fixedly connected to the free end of the bending structure through the reinforcing plate.

[0009] Optionally, it also includes a head tube, which is inclined relative to the main beam tube, the side wall of the head tube is fixedly connected to the upper end of the main beam tube, and a reinforcing frame is fixed at the angle between the head tube and the main beam tube.

[0010] Optionally, the wall thickness of the head tube is increased.

[0011] Optionally, the upper tube is a square steel tube, and the lower tube is a round steel tube.

[0012] This utility model provides a double-layer side tube composite curved beam high-strength frame. The front end of the lower side tube is provided with a bending structure that faces the main beam tube and tilts upwards. The free end of the bending structure is fixedly connected to the side wall of the main beam tube. The front end of the upper side tube is provided with a bending structure that faces the main beam tube and bends. The free end of the bending structure is fixedly connected to the side wall of the bending structure. The rear end of the upper side tube is fixedly connected to the rear end area of ​​the lower side tube, and the upper and lower side tubes together form a side beam structure. The two side beam structures are symmetrically arranged, and the main beam tube is located on the plane of symmetry. The double-layer composite curved beam design formed by the upper and lower side tubes and the main beam tube at the front end of the frame significantly improves the bending stiffness and torsional stiffness of the vehicle, reduces the sensitivity of the vehicle to pitch and yaw, and makes the vehicle extremely stable in posture during high-speed cruising, heavy riding, and braking, giving riders great confidence in handling. This solves the technical problems of insufficient bending and torsional stiffness of traditional frames in the prior art, which easily cause deformation and vibration, affecting riding safety and frame life.

[0013] The preferred technical solution of this utility model can also produce at least the following technical effects: 1. Superior Structural Rigidity: Through the design of a double-layered composite side tube with "square tube for torsion resistance + round tube for bending resistance" and a fixed connection between the side tube and the main beam tube, the overall rigidity and strength of the frame achieve a qualitative leap. Compared with frames made of single tubing, the torsional stiffness is significantly improved, effectively suppressing frame deformation caused by motor start-stop torque and road impacts, resulting in a more solid riding experience and clearer road feel.

[0014] 2. Excellent balance between strength and lightweight: Key dimensions are used in critical areas: the head tube (outer diameter 42mm, thickness 3mm) ensures steering rigidity, the upper tube (square tube specification 20*20mm, thickness 1.8mm) ensures torsional resistance, and the lower tube (round tube outer diameter 25mm, thickness 2mm) ensures bending resistance. This material strategy avoids excessive overall material usage, achieving excellent lightweight performance while ensuring strength far exceeding that of similar products.

[0015] 3. Combining Aesthetics and Safety: The combination of square and round tubing creates a strong and modern look, enhancing the product's appearance and brand recognition. More importantly, a rigid and non-deformable frame is fundamental to riding safety; this design improves the vehicle's safety performance from the structural level. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a structural schematic diagram of a double-layer side tube composite curved beam high-strength vehicle frame provided in an embodiment of this utility model; Figure 2 This is a structural schematic diagram of a double-layer side tube composite curved beam high-strength frame provided in an embodiment of the present utility model from another angle; Figure 3 This is a schematic diagram of a double-layer side tube composite curved beam high-strength frame with the integrated rear horizontal fork structure removed, provided by an embodiment of this utility model.

[0018] In the diagram: 1. Upper pipe; 11. Straight section; 12. Bending structure; 2. Bottom pipe; 21. Flat section; 22. First bend section; 23. Parallel section; 24. Second bend section; 25. Vertical section; 3. Main beam pipe; 31. Straight cylindrical section; 32. Curved section; 4. Horizontal pipe; 5. Reinforcing film; 6. Reinforcing plate; 7. Reinforcing frame; 8. Head tube; 9. Reinforcing frame; 10. Integrated rear swingarm structure; 20. Mandrel structure; 30. Flat-fork large plate; 40. Connecting rod; 50. Rear bracket; 60. Crossbeam. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions of this utility model will be described in detail below. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. Based on the embodiments of this utility model, all other implementation methods obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0020] In the description of this utility model, it should be noted that, unless otherwise stated, "a plurality of" means two or more; the terms "upper," "lower," "left," "right," "inner," "outer," "front end," "rear end," "head," "tail," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0021] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0022] This utility model provides a double-layer side tube composite curved beam high-strength vehicle frame, including an upper side tube 1, a lower side tube 2, and a main beam tube 3. The lower side tube 2 has a bending structure at its front end that faces the main beam tube 3 and is inclined upwards. The free end of the bending structure is fixedly connected to the side wall of the main beam tube 3. The upper side tube 1 has a bending structure 12 at its front end that faces the main beam tube 3 and is bent. The free end of the bending structure 12 is fixedly connected to the side wall of the bending structure. There are two upper side tubes 1 and two lower side tubes 2. The rear ends of the upper side tubes 1 and 2 are fixedly connected to the rear end regions of the lower side tubes 2, forming a side beam structure. The two side beam structures are symmetrically arranged, and the main beam tube 3 is located on the plane of symmetry. A space is formed between the main beam tube 3 and the two side beam structures to accommodate a battery. This utility model provides a double-layer side tube composite curved beam high-strength frame. By forming a double-layer composite curved beam design with the upper and lower side tubes at the front end of the frame and the main beam tube, it significantly improves the vehicle's bending stiffness and torsional stiffness, reduces the vehicle's sensitivity to pitch and yaw, and makes the vehicle extremely stable in posture during high-speed cruising, heavy riding, and braking, giving riders great confidence in handling. It solves the technical problems of insufficient bending and torsional stiffness in existing frames, which easily lead to deformation and vibration, affecting riding safety and frame life.

[0023] As an optional implementation, a reinforcing plate 5 is also included. The reinforcing plate 5 is fixed to the side wall of the bent structure, and the free end of the bent structure 12 is fixedly connected to the reinforcing plate 5. The reinforcing plate 5 is used to increase the thickness and connection strength at the connection between the bent structure and the bent structure 12.

[0024] As an optional implementation, the bending structure includes a flat section 21 and a first bending section 22. The flat section 21 is vertically arranged and has an arc-shaped flat structure to fit the straight cylindrical section 31. The flat section 21 is formed by extruding the circular tube portion. The upper end of the first bending section 22 is fixedly connected to the lower end of the flat section 21, and the connection between the first bending section 22 and the flat section 21 is an arc-shaped structure. The flat section 21 is fixedly connected to the side wall of the main beam tube 3, and the side wall of the first bending section 22 is fixedly connected to the free end of the bending structure 12 through a reinforcing piece 5.

[0025] The lower tube 2 also includes a parallel section 23, a second bent section 24, and a vertical section 25. The lower tube 2 is an integral structure, formed by bending and extrusion processes. The parallel section 23 is arranged in parallel, and the parallel section 23 and the flat section 21 are not in the same plane. The flat section 21 is located in front of the parallel section 23 and close to the main beam tube 3. The lower end of the first bent section 22 is fixedly connected to the front end of the parallel section 23, and the connection between the first bent section 22 and the parallel section 23 is an arc-shaped structure. The first bent section 22 is inclined, and its orientation is relative to the horizontal plane where the parallel section 23 is located, along the oblique inner direction, inclined upward. The lower end of the second bent section 24 is fixedly connected to the rear end of the parallel section 23, and the connection between the second bent section 24 and the parallel section 23 is an arc-shaped structure. The second bent section 24 is inclined, and its orientation is from the vertical plane where the parallel section 23 is located, along the oblique rear direction, inclined upward. The highest point of the second bending section 24 is higher than the highest point of the flat section 21. The upper end of the second bending section 24 is fixedly connected to the lower end of the vertical section 25, and the connection between the second bending section 24 and the vertical section 25 is an arc-shaped structure.

[0026] The main beam tube 3 includes a straight section 31 and an arc-shaped curved section 32. The main beam tube 3 is an integral structure formed by bending. The lower end of the main beam tube 3 is provided with an arc-shaped curved section 32 that bends backward. The lower end of the straight section 31 is fixedly connected to the upper end of the arc-shaped curved section 32. The straight section 31 is inclined relative to the vertical direction. The arc-shaped curved section 32 adopts a large arc bending form. The flat section 21 is attached to the side wall of the straight section 31 and fixedly connected by welding. The lower end of the arc-shaped curved section 32 is fixedly connected to the middle side wall of the transverse tube 4. The end of the transverse tube 4 is fixedly connected to the front side wall of the parallel section 23. That is, the two parallel sections 23 are welded to the two ends of the transverse tube 4 respectively.

[0027] The upper tube 1 also includes a straight section 11. The upper tube 1 is an integral structure formed by bending. The straight section 11 is fixedly connected to the curved structure 12, and the connection between the straight section 11 and the curved structure 12 is an arc-shaped structure. Both the curved structure 12 and the straight section 11 are in the horizontal plane. The curved structure 12 is inclined relative to the straight section 11. The free end of the curved structure 12 is fixedly connected to the side wall of the first bent section 22 by a reinforcing plate 5. The reinforcing plate 5 is used to increase the thickness and connection strength at the connection between the curved structure 12 and the first bent section 22. The free end of the straight section 11 is fixedly connected to the side wall of the second bent section 24. The straight section 11 and the parallel section 23 are arranged parallel to each other and have a gap. The straight section 11 and the parallel section 23 are fixedly connected by a reinforcing plate 6. There can be two reinforcing plates 6 between the straight section 11 and the parallel section 23. The reinforcing plates 6 are used to stabilize the position of the straight section 11 and the parallel section 23 and prevent deformation.

[0028] As an optional implementation, a reinforcing frame 7 is also included. The middle region of the reinforcing frame 7 is fixedly connected to the upper side wall of the arc-shaped bending section 32, and the two ends of the reinforcing frame 7 are respectively fixedly connected to the side walls of the two bending structures 12. That is, the two bending structures 12 are respectively welded to the two ends of the reinforcing frame 7. The reinforcing frame 7 is used to enhance the connection strength between the upper pipe 1 and the main beam pipe 3.

[0029] As an optional implementation, a head tube 8 is also included. The head tube 8 is inclined relative to the main beam tube 3, and its side wall is fixedly connected to the upper end of the main beam tube 3. A reinforcing frame 9 is fixed at the angle between the head tube 8 and the main beam tube 3. The head tube 8 is also inclined relative to the straight section 31, and its side wall is fixedly connected to the upper end of the straight section 31. A reinforcing frame 9 is fixed at the angle between the head tube 8 and the straight section 31. The head tube 8 has a thickened wall. The head tube 8 is made of high-strength steel pipe with an outer diameter of 42mm and a wall thickness of 3mm. This thickened head tube 8 can greatly enhance the connection rigidity with the front fork steering system, effectively cope with the impact of the heavier unsprung mass of the electric vehicle and complex road conditions, suppress the "head-shaking" phenomenon, and ensure steering precision and stability.

[0030] As an optional implementation, the upper tube 1 is a square steel tube, and the lower tube 2 is a round steel tube. The upper tube 1 is a 20mm×20mm square steel tube with a wall thickness of 1.8mm. The square steel tube structure has an inherent cross-sectional advantage when subjected to bending and torsional stress, which can greatly improve the torsional stiffness of the frame, making the vehicle feel more integrated and reducing deformation when riding, cornering, and riding on bumps. At the same time, as the main bracket and shape boundary of the battery compartment, the planar structure of the square steel tube is also more conducive to the fixation of subsequent accessories (such as wiring harnesses and decorative parts). The lower tube 2 is a round steel tube with an outer diameter of 25mm and a wall thickness of 2mm. The round steel tube has good bending and compressive strength. Working together with the upper tube 1, it forms a high-rigidity composite beam structure. The upper tube 1 and the lower tube 2 are fixed in parallel by welding, forming the main visual outline and main load-bearing structure of the frame.

[0031] It also includes an integrated rear swingarm structure 10, a spindle structure 20, and two swingarm plates 30. The swingarm plates 30 are fixed on the outer wall of the connection between the second bending section 24 and the parallel section 23. The spindle structure 20 passes through the bushing on the integrated rear swingarm structure 10 and a bearing is provided between the spindle structure 20 and the bushing. The end of the spindle structure 20 is connected to the swingarm plates 30. The two swingarm plates 30 are connected by a connecting rod 40.

[0032] It also includes a rear support 50, there are two rear supports 50, the rear support 50 is fixedly connected to the rear wall of the vertical section 25, and the two rear supports 50 are connected by a crossbeam 60.

[0033] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the protection scope of the claims.

Claims

1. A double-layered edge pipe composite type bending beam high strength vehicle frame, characterized by, It includes the upper pipe (1), the lower pipe (2), and the main beam pipe (3), among which, The front end of the lower tube (2) is provided with a bending structure that faces the direction of the main beam tube (3) and is inclined upward. The free end of the bending structure is fixedly connected to the side wall of the main beam tube (3). The front end of the upper tube (1) is provided with a bending structure (12) that faces the direction of the main beam tube (3) and is bent. The free end of the bending structure (12) is fixedly connected to the side wall of the bending structure. The rear end of the upper tube (1) is fixedly connected to the rear end area of ​​the lower tube (2), and the upper tube (1) and the lower tube (2) together form a side beam structure. The two side beam structures are symmetrically arranged, and the main beam tube (3) is located on the plane of symmetry.

2. The double-skin tube composite type bending beam high strength vehicle frame according to claim 1, characterized in that, It also includes a reinforcing piece (5), which is fixed to the side wall of the bending structure, and the free end of the bending structure (12) is fixedly connected to the reinforcing piece (5).

3. The double-layer side tube composite curved beam high-strength vehicle frame according to claim 1, characterized in that, It also includes a transverse tube (4), the two ends of which are fixedly connected to the parallel sections (23) on the two lower tubes (2), and the lower end of the main beam tube (3) is provided with a backward-curved arc section (32), the free end of which is fixedly connected to the middle side wall of the transverse tube (4).

4. The double-layer side tube composite curved beam high-strength vehicle frame according to claim 3, characterized in that, It also includes a reinforcing frame (7), the middle region of which is fixedly connected to the upper side wall of the arc-shaped curved section (32), and the two ends of the reinforcing frame (7) are fixedly connected to the side walls of the two curved structures (12) respectively.

5. A double-layer side tube composite curved beam high-strength vehicle frame according to claim 2, characterized in that, The bending structure includes a flat section (21) and a first bending section (22). The flat section (21) is vertically arranged and has an arc-shaped flat structure. The upper end of the first bending section (22) is fixedly connected to the lower end of the flat section (21), and the connection between the first bending section (22) and the flat section (21) is an arc-shaped structure. The flat section (21) is fixedly connected to the side wall of the main beam tube (3), and the side wall of the first bending section (22) is fixedly connected to the free end of the bending structure (12) through the reinforcing plate (5).

6. The double-layer side tube composite curved beam high-strength vehicle frame according to claim 1, characterized in that, It also includes a head tube (8), which is inclined relative to the main beam tube (3). The side wall of the head tube (8) is fixedly connected to the upper end of the main beam tube (3), and a reinforcing frame (9) is fixed at the angle between the head tube (8) and the main beam tube (3).

7. A double-layer side tube composite curved beam high-strength vehicle frame according to claim 6, characterized in that, The wall thickness of the head tube (8) is thickened.

8. A double-layer side tube composite curved beam high-strength vehicle frame according to claim 1, characterized in that, The upper tube (1) is a square steel tube, and the lower tube (2) is a round steel tube.

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