Frame side tube structure

Abstract

The utility model provides a kind of frame side pipe structure, it is related to electric vehicle frame structure technical field, solve the technical problem of the risk of fracture between side pipe and girder pipe in prior art existing.The device includes upper side pipe, lower side pipe, girder pipe and reinforcing pipe, wherein, the front end of the lower side pipe is fixedly connected with the lower end side wall of the girder pipe, one end of the reinforcing pipe is connected with the lower side pipe, the other end of the reinforcing pipe is fixedly connected with the side wall of the girder pipe, one end of the upper side pipe is fixedly connected with the upper side wall of the reinforcing pipe.

Description

Technical Field

[0001] This utility model relates to the field of electric vehicle frame structure technology, and in particular to a frame side tube structure. Background Technology

[0002] An electric vehicle is a mechatronic personal transportation tool that uses a battery as auxiliary power and is based on a regular bicycle. It is equipped with a motor, controller, battery, throttle, brake levers, and other control components, as well as a display instrument system. The frame is one of the main components of an electric vehicle. Traditionally, the side tubes of the frame are often directly welded to the main beam tubes.

[0003] The main problems are as follows: insufficient local rigidity, low torsional resistance, and easy breakage at the bends of the side tubes. Compared with traditional fuel-powered motorcycles, electric two-wheelers mostly use batteries under the pedals and hub motors, with the side tubes connecting to the main beam tubes and forks, making it the most important structural part in the middle of the electric two-wheeler. This places higher demands on the strength and rigidity of the side tubes. Traditional structures suffer from stress concentration, which easily leads to deformation and vibration, affecting riding safety and frame lifespan, and there is a risk of breakage between the side tubes and the main beam tubes. Therefore, there is an urgent need in this field for a new frame structure that can ensure lightweight, excellent stability, and simultaneously meet the requirements of rigidity and strength. Utility Model Content

[0004] The purpose of this utility model is to provide a side tube structure for a vehicle frame to solve the technical problem of the risk of breakage between the side tube and the main beam tube in the prior art. The various technical effects of the preferred technical solution among the many technical solutions provided by this utility model are detailed below.

[0005] To achieve the above objectives, the present invention provides the following technical solution: This utility model provides a frame side tube structure, including an upper side tube, a lower side tube, a main beam tube, and a reinforcing tube. The front end of the lower side tube is fixedly connected to the lower side wall of the main beam tube. One end of the reinforcing tube is connected to the lower side tube, and the other end of the reinforcing tube is fixedly connected to the side wall of the main beam tube. One end of the upper side tube is fixedly connected to the upper side wall of the reinforcing tube.

[0006] Optionally, the reinforcing tube includes an upper flat connecting section, a bent section, and a lower flat connecting section, wherein the upper flat connecting section, the bent section, and the lower flat connecting section are fixedly connected in sequence, the upper flat connecting section and the lower flat connecting section are both flat arc-shaped structures, and the bent section is a bent structure that is inclined upward; Optionally, the upper flat connecting section is attached to and fixedly connected to the side wall of the middle region of the main beam tube, the lower flat connecting section is attached to and fixedly connected to the side wall of the lower tube, and the side wall of the curved section is fixedly connected to one end of the upper tube.

[0007] Optionally, it also includes a reinforcing plate, which is fixed to the side wall of the curved section, and one end of the upper tube is fixedly connected to the reinforcing plate.

[0008] Optionally, it also includes a reinforcing plate located at the interval between the bent section and the upper tube, the lower end of the reinforcing plate being fixedly connected to the reinforcing sheet, and the upper end of the reinforcing plate being fixedly connected to the bend of the upper tube.

[0009] Optionally, the front end of the upper tube is provided with a bending structure, the free end of the bending structure is fixedly connected to the reinforcing plate, and the lower sidewall of the bending structure is fixedly connected to the upper end of the reinforcing plate.

[0010] Optionally, it also includes a support rod, the middle sidewall of which is fixedly connected to the sidewall of the middle region of the main beam tube, and the end of which is fixedly connected to the inner sidewall of the curved structure.

[0011] Optionally, the lower tube includes a parallel section and a bent structure that bends from the front end of the parallel section toward the main beam tube. The free end of the bent structure is fixedly connected to the lower side wall of the main beam tube, and the upper side wall of the front end region of the parallel section is attached to and fixedly connected to the lower flat connecting section.

[0012] Optionally, the upper tube is a square steel tube, the lower tube is a round steel tube, the main beam tube is a straight tube structure, and the reinforcing tube is a round steel tube.

[0013] This utility model provides a frame side tube structure, in which the front end of the lower side tube is fixedly connected to the lower side wall of the main beam tube, one end of the reinforcing tube is connected to the lower side tube, the other end of the reinforcing tube is fixedly connected to the side wall of the middle region of the main beam tube, and one end of the upper side tube is fixedly connected to the middle side wall of the reinforcing tube. By adding the reinforcing tube, a stable triangular structure can be constructed between the side tube and the main beam tube, which can effectively prevent frame deformation and increase the connection strength between the side tube and the main beam tube, making it less prone to breakage. This solves the technical problem of easy breakage risk between the side tube and the main beam tube in the prior art. The purpose of this invention is to provide a design that forms a double-layer composite side tube with the upper and lower side tubes at the front end of the frame, the main beam tube, and the reinforcing tube, significantly improving the vehicle's bending and torsional stiffness. This alleviates the technical problems of low strength at the connection between the side tubes and the main beam tube in existing electric vehicle frames, and the easy breakage of the side tubes at bends. The use of a combination of square and round tubes optimizes the mechanical distribution of the main beam tube structure, achieving an optimal balance between frame rigidity, strength, and lightweight. This results in more rational stress transmission, reduced stress concentration, and improved overall fatigue life and reliability of the frame.

[0014] The preferred technical solution of this utility model can also produce at least the following technical effects: 1. Ultimate Stability and Handling: The dual-layer composite side tube frame structure is the most direct benefit of this design. It utilizes a combination of square and round tubes to enhance bending and torsional stiffness, resulting in extremely stable handling and excellent control when riding under load, turning, and braking. 2. Superior Tube Strength: The frame features a composite double-layer design, combining square tubing for enhanced torsional strength and round tubing for enhanced bending strength, which is fixedly connected to the main beam. Compared to frames made of single tubing, this significantly improves torsional stiffness. It effectively withstands the impact loads from sudden braking, ensuring stable riding.

[0015] 3. Combining Aesthetics and Safety: The square tubing boasts sharp lines, while the round tubing offers softer lines; together, they enhance the product's appearance and brand recognition. More importantly, a rigid, non-deformable frame is fundamental to riding safety, and 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 schematic diagram of a side tube structure of a vehicle frame provided in an embodiment of the present utility model; Figure 2 This is a partial structural schematic diagram of a vehicle frame side tube structure provided in an embodiment of this utility model.

[0018] In the diagram: 1. Upper pipe; 11. Bending structure; 12. Straight section; 2. Bottom pipe; 21. Bending structure; 22. Parallel section; 23. Inclined section; 24. Vertical section; 3. Main beam pipe; 4. Reinforcing pipe; 41. Upper flat connecting section; 42. Bending section; 43. Lower flat connecting section; 5. Reinforcing film; 6. Reinforcing plate; 7. Support rod; 8. Reinforcing frame. 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 frame side tube structure, including an upper side tube 1, a lower side tube 2, a main beam tube 3, and a reinforcing tube 4. The front end of the lower side tube 2 is fixedly connected to the lower side wall of the main beam tube 3. One end of the reinforcing tube 4 is connected to the lower side tube 2, and the other end of the reinforcing tube 4 is fixedly connected to the side wall of the middle region of the main beam tube 3. One end of the upper side tube 1 is fixedly connected to the middle side wall of the reinforcing tube 4. This frame side tube structure, by adding the reinforcing tube 4, creates a stable triangular structure between the side tube and the main beam tube 3, effectively preventing frame deformation. It also increases the connection strength between the side tube and the main beam tube 3, making it less prone to breakage, thus solving the technical problem of easy breakage between the side tube and the main beam tube in existing technologies.

[0023] As an optional implementation, the reinforcing tube 4 includes an upper flat connecting section 41, a bent section 42, and a lower flat connecting section 43. The reinforcing tube 4 is an integral structure, formed by bending and extrusion processes. The upper flat connecting section 41, the bent section 42, and the lower flat connecting section 43 are fixedly connected in sequence. Both the upper flat connecting section 41 and the lower flat connecting section 43 are flat arc-shaped structures. The upper flat connecting section 41 is arranged vertically, and the lower flat connecting section 43 is arranged horizontally. The bent section 42 is a bent structure and tilts upward. The upper flat connecting section 41 is attached to and fixedly connected to the side wall of the middle region of the main beam tube 3. The upper flat connecting section 41 is welded to the main beam tube 3. The lower flat connecting section 43 is attached to and fixedly connected to the side wall of the lower side tube 2. The lower flat connecting section 43 is welded to the lower side tube 2. The side wall of the bent section 42 is fixedly connected to one end of the upper side tube 1. The reinforcing tube 4 is a circular steel tube with a diameter of 32mm and a wall thickness of 2mm. Both ends are flattened and fixedly connected to the main beam tube 3 and the lower tube 2 respectively, forming a stable triangular structure.

[0024] As an optional implementation, a reinforcing plate 5 is also included. The reinforcing plate 5 is fixed to the side wall of the bending section 42, and one end of the upper tube 1 is fixedly connected to the reinforcing plate 5. The reinforcing plate 5 is used to increase the thickness of the side wall of the bending section 42. Thus, when the upper tube 1 is connected to the bending section 42, the reinforcing plate 5 is located at the connection point between the upper tube 1 and the bending section 42, thereby enhancing the connection strength between the upper tube 1 and the bending section 42, avoiding stress concentration, reducing the risk of fracture, improving the fatigue strength of the frame, and extending the service life of the frame. The length of the reinforcing plate 5 is slightly shorter than the length of the bending section 42, and the reinforcing plate 5 covers the side wall area of ​​the bending section 42. The reinforcing plate 5 is a stamped part in the form of a 2mm thick sheet to avoid subsequent welding to the reinforcing tube 4, which could easily cause stress concentration and reduce the overall fatigue life of the frame.

[0025] As an optional implementation, a reinforcing plate 6 is also included. The reinforcing plate 6 is located at the gap between the bent section 42 and the upper tube 1. The lower end of the reinforcing plate 6 is fixedly connected to the reinforcing piece 5, and the upper end of the reinforcing plate 6 is fixedly connected to the bend of the upper tube 1. The reinforcing plate 6 is also used to strengthen the connection between the bent section 42 and the upper tube 1, thereby improving its stability. The reinforcing plate 6 is a stamped part with a wall thickness of 2mm, which strengthens the bend of the upper tube 1, significantly improving the overall strength of the frame.

[0026] As an optional implementation, the upper tube 1 includes a straight section 12 and a curved structure 11 that bends from the front end of the straight section 12 toward the main beam tube 3. The tube 1 is an integral structure formed by bending. The curved structure 11 and the straight section 12 are both on the same horizontal plane. The free end of the curved structure 11 is fixedly connected to the reinforcing plate 5. Specifically, the free end of the curved structure 11 is welded to the reinforcing plate 5. The lower side wall of the curved structure 11 is fixedly connected to the upper end of the reinforcing plate 6.

[0027] As an optional implementation, it also includes a support rod 7, the middle side wall of the support rod 7 is fixedly connected to the side wall of the middle region of the main beam tube 3, the connection between the support rod 7 and the main beam tube 3 is lower than the connection between the upper flat connecting section 41 and the main beam tube 3, and the end of the support rod 7 is fixedly connected to the inner side wall of the bending structure 11, that is, the two bending structures 11 are respectively fixedly connected to the two ends of the support rod 7.

[0028] As an optional implementation, the lower tube 2 includes a parallel section 22 and a bent structure 21 that bends from the front end of the parallel section 22 toward the main beam tube 3. The bent structure 21 and the parallel section 22 are on the same horizontal plane, and the bending angle between the bent structure 21 and the parallel section 22 is 90°. The free end of the bent structure 21 is fixedly connected to the lower side wall of the main beam tube 3, and the end of the bent structure 21 extends into the main beam tube 3. The contact area between the bent structure 21 and the main beam tube 3 is welded together. The upper side wall of the front end area of ​​the parallel section 22 is attached to and fixedly connected to the lower flat connecting section 43. Additionally, the lower tube 2 includes an inclined section 23 and a vertical section 24. The lower tube 2 is a one-piece structure, formed by bending. The rear end of the parallel section 22 is fixedly connected to the lower end of the inclined section 23, and the connection between the parallel section 22 and the inclined section 23 is an arc-shaped structure. The side wall of the inclined section 23 is fixedly connected to the rear end of the straight section 12. The inclined section 23 is inclined relative to the parallel section 22, and the inclined section 23 and the parallel section 22 are on the same vertical plane. The upper end of the inclined section 23 is fixedly connected to the lower end of the vertical section 24, and the connection between the inclined section 23 and the vertical section 24 is an arc-shaped structure. The parallel section 22 and the straight section 12 are arranged parallel to each other and are fixedly connected by reinforcing frames 8. There are two reinforcing frames 8 between the parallel section 22 and the straight section 12.

[0029] As an optional implementation, the upper tube 1 is a 20mm×20mm square steel tube with a wall thickness of 2mm, the lower tube 2 is a 32mm diameter round steel tube with a wall thickness of 2mm, and the main beam tube 3 is a straight tube structure. There are two upper tubes 1, two lower tubes 2, and two reinforcing tubes 4, all symmetrically arranged with the main beam tube 3 located on the plane of symmetry. Through the design of the irregularly shaped composite side tubes combining "square tube for torsional resistance + round tube for bending resistance," the overall rigidity and strength of the frame achieve a qualitative leap. The square cross-section tube shape enhances the frame's torsional resistance. Square steel tubes have an inherent cross-sectional advantage when subjected to bending and torsional stress, resulting in greater stability during bending during vehicle operation. Simultaneously, the flat surface of the square tube facilitates the installation of plastic parts, avoiding the need for welding stamping parts on round tubes, which increases weight. This significantly improves the frame's torsional stiffness, making the vehicle feel more integrated and reducing deformation during riding, cornering, and over bumps. Simultaneously, as the main support and structural boundary of the battery compartment, the planar structure of the square steel tubes facilitates the fixing of subsequent accessories (such as wiring harnesses and decorative parts); the round steel tubes have good bending and compressive strength, working together with the upper side tube 1 to form a high-rigidity double-layer composite side tube structure, forming the main outer contour and load-bearing structure of the frame. This double-layer composite side tube structure, combined with the 1245mm long wheelbase, provides a stable triangular structure for the front section of the frame, while the rear battery compartment space is ideal for installing long lead-acid battery packs, achieving a perfect unity between structural layout and functional requirements.

[0030] 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 side tube structure for a vehicle frame, characterized in that, It includes an upper tube (1), a lower tube (2), a main beam tube (3), and a reinforcing tube (4), among which, The front end of the lower tube (2) is fixedly connected to the lower side wall of the main beam tube (3), one end of the reinforcing tube (4) is connected to the lower tube (2), the other end of the reinforcing tube (4) is fixedly connected to the side wall of the main beam tube (3), and one end of the upper tube (1) is fixedly connected to the upper side wall of the reinforcing tube (4).

2. The side tube structure of a vehicle frame according to claim 1, characterized in that, The reinforcing tube (4) includes an upper flat connecting section (41), a curved section (42) and a lower flat connecting section (43). The upper flat connecting section (41), the curved section (42) and the lower flat connecting section (43) are fixedly connected in sequence. The upper flat connecting section (41) and the lower flat connecting section (43) are both flat arc-shaped structures, and the curved section (42) is a curved structure that is inclined upward.

3. The side tube structure of a vehicle frame according to claim 2, characterized in that, The upper flat connecting section (41) is attached to and fixedly connected to the side wall of the middle region of the main beam tube (3), the lower flat connecting section (43) is attached to and fixedly connected to the side wall of the lower side tube (2), and the side wall of the curved section (42) is fixedly connected to one end of the upper side tube (1).

4. A side tube structure for a vehicle frame according to claim 2, characterized in that, It also includes a reinforcing plate (5), which is fixed to the side wall of the curved section (42), and one end of the upper tube (1) is fixedly connected to the reinforcing plate (5).

5. A side tube structure for a vehicle frame according to claim 4, characterized in that, It also includes a reinforcing plate (6), which is located at the interval between the bent section (42) and the upper tube (1). The lower end of the reinforcing plate (6) is fixedly connected to the reinforcing piece (5), and the upper end of the reinforcing plate (6) is fixedly connected to the upper tube (1).

6. A side tube structure for a vehicle frame according to claim 5, characterized in that, The upper tube (1) has a curved structure (11) at its front end. The free end of the curved structure (11) is fixedly connected to the reinforcing plate (5), and the lower side wall of the curved structure (11) is fixedly connected to the upper end of the reinforcing plate (6).

7. A side tube structure for a vehicle frame according to claim 6, characterized in that, It also includes a support rod (7), the middle side wall of which is fixedly connected to the side wall of the middle region of the main beam tube (3), and the end of the support rod (7) is fixedly connected to the inner side wall of the curved structure (11).

8. A side tube structure for a vehicle frame according to claim 2, characterized in that, The lower tube (2) includes a parallel section (22) and a bending structure (21) that bends from the front end of the parallel section (22) toward the main beam tube (3). The free end of the bending structure (21) is fixedly connected to the lower side wall of the main beam tube (3), and the upper side wall of the front end region of the parallel section (22) is attached to and fixedly connected to the lower flat connecting section (43).

9. A side tube structure for a vehicle frame according to claim 1, characterized in that, The upper tube (1) is a square steel pipe, the lower tube (2) is a round steel pipe, the main beam tube (3) is a straight pipe structure, and the reinforcing tube (4) is a round steel pipe.

Images