Leaf spring receiving point vehicle body reinforcing structure, manufacturing method, and vehicle

Abstract

The application discloses a leaf spring bearing point vehicle body reinforcing structure, which comprises a rear longitudinal beam body, a leaf spring hanging front support arranged on the rear longitudinal beam body and a reinforcing pipe beam arranged on the leaf spring hanging front support; the reinforcing pipe beam is transversely arranged and penetrates through the mounting holes of the left and right leaf spring hanging front supports, and the two ends of the reinforcing pipe beam are respectively welded and fixedly connected with the left and right leaf spring hanging front supports, and the reinforcing pipe beam is located below the rear longitudinal beam body. The leaf spring bearing point vehicle body reinforcing structure of the application can improve the overall performance by optimizing the design of the vehicle body reinforcing structure, improve the overall dynamic stiffness of the vehicle body, strengthen the fatigue resistance and dynamic stability of the mounting point area, and meet the high performance requirements of commercial vehicles on the leaf spring system mounting point. The application further discloses a vehicle and a manufacturing method of the leaf spring bearing point vehicle body reinforcing structure.

Description

Technical Field

[0001] This invention belongs to the field of automotive body structure design technology. Specifically, this invention relates to a leaf spring bearing point body reinforcement structure, manufacturing method, and vehicle. Background Technology

[0002] In the overall structural system of commercial vehicles, the rear suspension leaf spring system occupies a central position. It is a key functional component for achieving vehicle load-bearing, vibration damping, and shock absorption, directly affecting the driving performance and operational safety of commercial vehicles. Specifically, the leaf spring system needs to stably bear and transmit various loads generated during vehicle operation, including static loads composed of cargo weight and vehicle weight, as well as dynamic impact loads caused by road unevenness. At the same time, it also needs to effectively dampen driving vibrations, providing a fundamental guarantee for vehicle handling stability and ride comfort.

[0003] Since the performance of the leaf spring system has a decisive impact on the overall vehicle operating quality, the design of the installation point area, which is the connection hub between the leaf spring system and the vehicle body structure, has become a key link in the development of commercial vehicle body structure, and must meet stringent performance requirements in multiple dimensions. In terms of structural strength, the mounting point area must be able to withstand extreme conditions exceeding five times the rated load to cope with the load impact of commercial vehicles under extreme scenarios such as heavy loads, rapid acceleration, or sudden road obstacles, avoiding breakage or failure of the mounting point due to insufficient structural strength. In terms of fatigue performance, the mounting bracket must pass more than 1 million alternating load tests, and the stress amplitude during the test must be strictly controlled within 250MPa. This is because during long-term operation of commercial vehicles, the mounting point area will continuously be subjected to alternating loads. If the fatigue performance does not meet the standards, fatigue cracks are likely to occur, leading to structural damage and affecting the service life and driving safety of the vehicle. In terms of dynamic stability, when facing typical dynamic conditions such as emergency braking (deceleration up to 0.8g) and high-speed steering (lateral acceleration up to 0.4g), the displacement of the mounting point must be controlled within ±1.5mm to ensure that the leaf spring system can maintain a stable connection under dynamic conditions, avoiding suspension system malfunction due to excessive displacement, which would affect the vehicle's handling response and driving stability.

[0004] Based on these stringent requirements, the mounting points on the vehicle body must possess excellent fatigue resistance and durability to withstand the erosion of long-term alternating stress. Simultaneously, they must maintain superior structural stability under various dynamic conditions such as vehicle steering, braking, and bumps, thus providing solid support for the reliability and safety of the entire vehicle. However, in existing technologies, the mounting points of commercial vehicle side leaf spring systems mostly adopt traditional basic structure designs. This type of design has limitations in load transfer path planning, making it difficult to achieve synergistic optimization of overall vehicle body stiffness and local structural performance. Specifically, traditional structures cannot effectively reconstruct the load transfer path, resulting in lower overall dynamic stiffness of the vehicle body. This leads to significant vibration and noise during vehicle operation, affecting not only ride comfort but also exacerbating stress concentration in the mounting point area. Consequently, its fatigue resistance and dynamic stability cannot fully meet the aforementioned stringent design requirements, thus hindering the improvement of the overall performance of commercial vehicles.

[0005] This invention provides a body reinforcement structure for leaf spring mounting points, specifically addressing how to improve the overall dynamic stiffness of the vehicle body while enhancing the fatigue resistance and dynamic stability of the mounting point area, thus meeting the high-performance requirements of commercial vehicles for leaf spring system mounting points. Summary of the Invention

[0006] This invention aims to at least solve one of the technical problems existing in the prior art. To this end, this invention provides a body reinforcement structure for the leaf spring mounting point, with the purpose of improving the overall dynamic stiffness of the vehicle body, while simultaneously enhancing the fatigue resistance and dynamic stability of the mounting point area, thus meeting the high-performance requirements of commercial vehicles for leaf spring system mounting points.

[0007] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is: a leaf spring bearing point body reinforcement structure, including a rear longitudinal beam body, a leaf spring suspension front bracket set on the rear longitudinal beam body, and a reinforcing tube beam set on the leaf spring suspension front bracket; the reinforcing tube beam is arranged laterally and passes through the mounting holes of the left and right leaf spring suspension front brackets, and the two ends of the reinforcing tube beam are respectively welded and fixedly connected to the left and right leaf spring suspension front brackets, and the reinforcing tube beam is located below the rear longitudinal beam body.

[0008] The upper part of the leaf spring suspending front bracket is snapped onto both sides of the rear longitudinal beam body and welded and fixedly connected to the rear longitudinal beam body.

[0009] The aforementioned leaf spring bearing point body reinforcement structure also includes a reinforcing plate, which is fixed to the inner side of the rear longitudinal beam body and forms an integral reinforced connection with the leaf spring suspension front bracket using a three-layer welded structure.

[0010] The reinforcing plate has a U-shaped structure.

[0011] Both ends of the reinforced tube beam are welded and fixed to the front bracket of the leaf spring suspension using carbon dioxide shielded welding.

[0012] The rear longitudinal beam body is provided with reinforcing ribs at key positions near the leaf spring suspension front bracket.

[0013] The present invention also provides a method for manufacturing a leaf spring bearing point body reinforcement structure, comprising the following steps: S1. Install the leaf spring suspension front bracket on the rear longitudinal beam body; snap the upper part of the leaf spring suspension front bracket to both sides of the rear longitudinal beam body and fix it by spot welding; S2. Install reinforcing plates on the rear longitudinal beam body; S3. Insert the reinforcing tube beam into the mounting hole of the leaf spring suspension front bracket, and then weld the reinforcing tube beam to the leaf spring suspension front bracket.

[0014] In step S2, the reinforcing plate is positioned inside the rear longitudinal beam body to form a three-layer welded structure with the leaf spring suspension front bracket.

[0015] In step S3, after the reinforcing tube beam is positioned by the clamp, four arc-shaped welds are performed on the inner and outer sides using carbon dioxide shielded welding to weld the reinforcing tube beam to the leaf spring suspension front bracket.

[0016] The present invention also provides a vehicle including the aforementioned leaf spring bearing point body reinforcement structure.

[0017] The leaf spring mounting point body reinforcement structure of the present invention significantly improves the overall performance by optimizing the design of the body reinforcement structure. It can improve the overall dynamic stiffness of the body, while strengthening the fatigue resistance and dynamic stability of the mounting point area, thus meeting the high performance requirements of commercial vehicles for the mounting point of the leaf spring system. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the body reinforcement structure at the leaf spring contact point of the present invention; Figure 2 This is a bottom view of the rear frame assembly.

[0019] Figure 3 This is a side view of the rear frame assembly.

[0020] Figure 4 This is a sectional view of the invention structure.

[0021] Figure 5 These are exploded views of the key component structures; The markings in the above figures are as follows: 1. Leaf spring suspension front bracket; 2. Reinforcing plate; 3. Rear longitudinal beam body; 4. Reinforcing tube beam; 5. Leaf spring suspension rear bracket; 6. First longitudinal beam side wall; 7. Second longitudinal beam side wall; 8. First bracket side wall; 9. Second bracket side wall; 10. Bracket rear side wall; 11. Mounting hole. Detailed Implementation

[0022] To facilitate understanding of the present invention, a more comprehensive description of the present invention will be given below with reference to the accompanying drawings, which illustrate several embodiments of the present invention. However, the present invention can be implemented in different forms and is not limited to the embodiments described in the text. Rather, these embodiments are provided to make the disclosure of the present invention more thorough and complete.

[0023] It should be noted that when an element is referred to as being "fixed to" another element, it can be directly on the other element or there may be an intervening element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "upper," "lower," and similar expressions used in this document are for illustrative purposes only.

[0024] It should be noted that in the following embodiments, the terms "first," "second," and "third" do not represent an absolute distinction in structure and / or function, nor do they represent the order of execution; they are merely for the convenience of description.

[0025] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly associated with those skilled in the art to which this invention pertains. The terminology used herein in the specification of this invention is for the purpose of describing particular embodiments and is not intended to limit the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0026] Firstly, such as Figures 1 to 5 As shown, this embodiment of the invention provides a leaf spring bearing point vehicle body reinforcement structure, including a rear longitudinal beam body 3, a leaf spring suspension front bracket 1 disposed on the rear longitudinal beam body 3, and a reinforcing tube beam 4 disposed on the leaf spring suspension front bracket 1; the reinforcing tube beam 4 is arranged laterally and passes through the mounting holes 11 of the left and right leaf spring suspension front brackets 1, and the two ends of the reinforcing tube beam 4 are respectively welded and fixedly connected to the left and right leaf spring suspension front brackets 1, and the reinforcing tube beam 4 is located below the rear longitudinal beam body 3.

[0027] Specifically, in this embodiment of the invention, the focus is on addressing issues such as insufficient local stiffness and stress concentration in the vehicle body. The provided leaf spring support point body reinforcement structure is suitable for commercial vehicle development or chassis optimization scenarios. The improvements of the leaf spring support point body reinforcement structure are as follows: 1) This invention represents a significant technological breakthrough in the field of automotive body structure, innovatively proposing a through-type tubular beam structure design. Compared to traditional basic structures, this design reconstructs the load transfer path through the through-type layout of tubular beams. Experimental testing has verified that the overall dynamic stiffness of the vehicle body is increased by 15%, significantly improving the vehicle's NVH performance. 2) In terms of specific structural layout, the connection position of the tube beam was innovatively optimized and transferred from the traditional longitudinal beam connection to the leaf spring hanging bracket. This change makes full use of the triangular stability structural characteristics of the leaf spring hanging bracket, which not only increases the dynamic stiffness of the rear leaf spring mounting point by 15%, but also successfully controls the local stress concentration factor to below 1.5. 3) This innovative design also demonstrates a significant advantage in reducing the number of processes: Traditional longitudinal beams, due to their large size, require large stamping dies. However, this solution, through structural optimization, completely avoids the need for additional punching processes on the longitudinal beams, saving approximately 180,000 yuan in punching die development costs per vehicle model. CAE simulation analysis and real-vehicle testing have verified that the new structure, while improving strength, reduces the die-making process by one step. This innovation provides a new technical path for lightweight automotive design and cost control.

[0028] This invention proposes a structural optimization scheme for the front mounting point of the rear leaf spring. By modifying the structure using the reinforcing tube beam 4, the design risk of insufficient stiffness in this area is effectively resolved. Specific improvements include optimizing the position of the reinforcing tube beam 4 and adding local reinforcing ribs. Testing has verified that the improved Y-direction (body width direction) stiffness of the mounting point has significantly improved by approximately 1562 N / mm, fully meeting the design requirements. This scheme not only solves the stiffness deficiency of the original design structure but also achieves a balance between weight and performance through reasonable lightweight design.

[0029] In embodiments of the present invention, such as Figures 1 to 5 As shown, a leaf spring suspension front bracket 1 and a leaf spring suspension rear bracket 5 are installed on the rear longitudinal beam body 3. The two ends of the leaf spring are connected to the leaf spring suspension front bracket 1 and the leaf spring suspension rear bracket 5 respectively. The leaf spring suspension front bracket 1 and the leaf spring suspension rear bracket 5 are arranged sequentially along the length direction of the rear longitudinal beam body 3. There are two rear longitudinal beam bodies 3, leaf spring suspension front brackets 1 and leaf spring suspension rear brackets 5. Each rear longitudinal beam body 3 is provided with one leaf spring suspension front bracket 1 and one leaf spring suspension rear bracket 5. The length direction of the reinforcing tube beam 4 is perpendicular to the length direction of the rear longitudinal beam body 3. The reinforcing tube beam 4 is located below the two rear longitudinal beam bodies 3. The reinforcing tube beam 4 is fixedly connected to the two leaf spring suspension front brackets 1. The reinforcing tube beam 4 passes through the mounting holes 11 provided on the two leaf spring suspension front brackets 1. The reinforcing tube beam 4 is a hollow round tube. The length direction of the reinforcing tube beam 4 is parallel to the Y direction. The length direction of the rear longitudinal beam body 3 is parallel to the X direction (the length direction of the vehicle body).

[0030] In this embodiment of the invention, the two ends of the reinforcing tube beam 4 are welded and fixedly connected to the two leaf spring suspension front brackets 1 by carbon dioxide shielded welding. The reinforcing tube beam 4 is moved from the rear longitudinal beam body 3 to the position of the leaf spring front suspension bracket for welding, and reinforcing ribs are added to the rear longitudinal beam body 3 at the same time, which increases the dynamic stiffness of the vehicle body by 15% and the Y-direction stiffness by 1562 N / mm.

[0031] The rear longitudinal beam body 3 has reinforcing ribs at key positions near the leaf spring suspension front bracket 1, thereby achieving a more effective strengthening effect.

[0032] In this embodiment of the invention, the upper part of the leaf spring suspending front bracket 1 is snapped onto both sides of the rear longitudinal beam body 3 and welded and fixedly connected to the rear longitudinal beam body 3. For example... Figures 1 to 5 As shown, the rear longitudinal beam body 3 is a beam structure with a U-shaped cross-section. The rear longitudinal beam body 3 includes a bottom wall of the longitudinal beam and a first longitudinal beam side wall 6 and a second longitudinal beam side wall 7 disposed at opposite ends of the bottom wall of the longitudinal beam. The first longitudinal beam side wall 6 and the second longitudinal beam side wall 7 are located above the bottom wall of the longitudinal beam and are arranged opposite to each other. The bottom wall of the longitudinal beam and the first longitudinal beam side wall 6 and the second longitudinal beam side wall 7 surround and form the inner cavity of the rear longitudinal beam body 3. The leaf spring suspending front bracket 1 includes a first bracket side wall 8 and a second bracket side wall 9. A support sidewall 8 is located outside the first longitudinal beam sidewall 6. The first support sidewall 8 is attached to the first longitudinal beam sidewall 6 and the two are welded and fixedly connected. A second support sidewall 9 is located outside the second longitudinal beam sidewall 7. The second support sidewall 9 is attached to the second longitudinal beam sidewall 7 and the two are welded and fixedly connected. Mounting holes 11 are provided on the first support sidewall 8 and the second support sidewall 9. The reinforcing tube beam 4 is welded and fixedly connected to the first support sidewall 8 and the second support sidewall 9. The bottom wall of the longitudinal beam is located between the first support sidewall 8 and the second support sidewall 9.

[0033] In embodiments of the present invention, such as Figures 1 to 5 As shown, the leaf spring suspension front bracket 1 also includes a front side wall and a rear side wall 10, which are arranged opposite to each other. The front side wall is located in front of the rear side wall 10, and the reinforcing tube beam 4 is located between the front and rear side walls 10. Both ends of the front side wall are fixedly connected to the front edge of the first side wall 8 and the front edge of the second side wall 9, respectively. Both ends of the rear side wall 10 are fixedly connected to the rear edge of the first side wall 8 and the rear edge of the second side wall 9, respectively. The upper ends of the front and rear side walls 10 are provided with upturned flanges. The upturned flange on the upper end of the front side wall is located below the bottom wall of the longitudinal beam and is welded to the bottom wall of the longitudinal beam. The upturned flange on the upper end of the rear side wall 10 is located below the bottom wall of the longitudinal beam and is welded to the bottom wall of the longitudinal beam.

[0034] The leaf spring suspension front bracket 1 adopts the above structure. The front bracket uses a composite connection scheme of double side wall bonding and upper and lower flange welding to form an all-round rigid connection with the U-shaped rear longitudinal beam. The first bracket side wall 8 and the second bracket side wall 9 are bonded and welded to the two side walls of the longitudinal beam respectively. With the layout of the bottom wall of the longitudinal beam located between the two side walls, a lateral embracing structure for the longitudinal beam is formed. The single-sided welding contact area is increased, which can directly bear the lateral load transmitted by the leaf spring. At the same time, the upper flanges of the front and rear side walls of the front bracket are welded to the bottom wall of the longitudinal beam to form a longitudinal double support point. Under emergency braking conditions, it can effectively resist the longitudinal tension of the leaf spring and avoid the failure of the connection point between the front bracket and the longitudinal beam. The leaf spring suspension front bracket 1 serves as the load transfer hub. The reinforcing tube beam 4 is set through the two leaf spring suspension front brackets 1. The load transfer path is reconstructed through the tube beam layout, which improves the load transfer efficiency. The mounting hole 11 is set in the middle of the side wall of the two brackets. With the auxiliary support of the front and rear side walls of the brackets, the concentrated load transmitted from the tube beam is distributed to the longitudinal beam through four welded nodes. The overall dynamic stiffness of the vehicle body is increased by 15%, which significantly improves the NVH performance of the vehicle.

[0035] like Figures 1 to 5 As shown, the leaf spring bearing point body reinforcement structure of this embodiment of the invention also includes a reinforcing plate 2. The reinforcing plate 2 and the leaf spring hanging front bracket 1 are located at the same position in the length direction of the rear longitudinal beam body 3. The reinforcing plate 2 is fixed to the inner side of the rear longitudinal beam body 3 and together with the leaf spring hanging front bracket 1, they adopt a three-layer welded structure to form an integral reinforcement connection.

[0036] In embodiments of the present invention, such as Figure 5 As shown, the reinforcing plate 2 has a U-shaped structure and is located inside the cavity of the rear longitudinal beam body 3. It is situated above the bottom wall of the longitudinal beam and between the first longitudinal beam side wall 6 and the second longitudinal beam side wall 7. The reinforcing plate 2 is welded to the bottom wall of the longitudinal beam, the first longitudinal beam side wall 6, and the second longitudinal beam side wall 7. The reinforcing plate 2 is fixed to the inner side of the rear longitudinal beam body 3 and, together with the leaf spring suspension front bracket 1, is welded into a single unit using a three-layer welding method. This provides better support and reinforcement on the upper inner side of the leaf spring suspension front bracket 1. All welding is done using point welding, and the left and right reinforcing structures are symmetrical.

[0037] Preferably, the sheet metal thickness of the leaf spring suspension front bracket 1 is 1.5mm to 1.8mm, the sheet metal thickness of the reinforcing plate 2 is 1.5mm to 1.8mm, the sheet metal thickness of the rear longitudinal beam body 3 is 1.5mm to 1.8mm, and the sheet metal thickness of the reinforcing tube beam 4 is 1.5mm to 1.8mm. The sheet metal thicknesses of the reinforcing plate 2 and the rear longitudinal beam body 3 are matched and configured according to the structural stress position, so as to reduce the vehicle weight while meeting the rigidity requirements.

[0038] In this embodiment of the invention, the sheet metal thickness of the leaf spring suspension front bracket 1 is 1.8mm, that is, the thickness of the first bracket side wall 8, the second bracket side wall 9, the front side wall of the bracket, and the rear side wall of the bracket 10 is 1.8mm. The wall thickness of the reinforcing tube beam 4 is 1.8mm. The sheet metal thickness of the reinforcing plate 2 is 1.5mm. The sheet metal thickness of the rear longitudinal beam body 3 is 1.5mm, that is, the thickness of the first longitudinal beam side wall 6, the second longitudinal beam side wall 7, and the bottom wall of the longitudinal beam is 1.5mm. Using appropriate material thickness achieves stronger load-bearing rigidity, thus achieving both the vehicle body rigidity target and the overall vehicle weight reduction effect.

[0039] Secondly, embodiments of the present invention also provide a method for manufacturing a leaf spring bearing point body reinforcement structure, comprising the following steps: S1. Install the leaf spring suspension front bracket 1 on the rear longitudinal beam body 3; snap the upper part of the leaf spring suspension front bracket 1 to both sides of the rear longitudinal beam body 3 and fix it by spot welding; S2. Install reinforcing plate 2 on the rear longitudinal beam body 3; S3. Insert the reinforcing tube beam 4 into the mounting hole 11 of the leaf spring hanging front bracket 1, and then weld the reinforcing tube beam 4 to the leaf spring hanging front bracket 1.

[0040] In step S1 above, the first support sidewall 8 is attached to the first longitudinal beam sidewall 6, the second support sidewall 9 is attached to the second longitudinal beam sidewall 7, and the upper flanges of the front and rear sidewalls 10 of the support are attached to the bottom surface of the longitudinal beam bottom wall. Then, the first support sidewall 8 is welded to the first longitudinal beam sidewall 6, the second support sidewall 9 is welded to the second longitudinal beam sidewall 7, and the upper flanges of the front and rear sidewalls 10 of the support are welded to the longitudinal beam bottom wall.

[0041] In step S2 above, the reinforcing plate 2 is positioned inside the rear longitudinal beam body 3, forming a three-layer welded structure with the leaf spring suspension front bracket 1.

[0042] In step S3 above, after positioning the reinforcing tube beam 4, four arc-shaped welds are performed on the inner and outer sides using carbon dioxide shielded welding to weld the reinforcing tube beam 4 onto the leaf spring suspension front bracket 1.

[0043] Thirdly, embodiments of the present invention also provide a vehicle including the leaf spring support point body reinforcement structure described above. The vehicle is a commercial vehicle, and this leaf spring support point body reinforcement structure can be referred to... Figures 1 to 5 Further details will not be elaborated here. Since the vehicle of the present invention includes the leaf spring bearing point body reinforcement structure in the above embodiments, it possesses all the advantages of the aforementioned leaf spring bearing point body reinforcement structure.

[0044] The present invention has been described above by way of example with reference to the accompanying drawings. Obviously, the specific implementation of the present invention is not limited to the above-described manner. Any non-substantial improvements made using the inventive concept and technical solution of the present invention, or the direct application of the inventive concept and technical solution of the present invention to other occasions without modification, are all within the protection scope of the present invention.

Claims

1. A leaf spring bearing point body reinforcement structure, characterized in that, It includes a rear longitudinal beam body, a leaf spring suspension front bracket set on the rear longitudinal beam body, and a reinforcing tube beam set on the leaf spring suspension front bracket; the reinforcing tube beam is arranged laterally and passes through the mounting holes of the left and right leaf spring suspension front brackets, and the two ends of the reinforcing tube beam are respectively welded and fixedly connected to the left and right leaf spring suspension front brackets, and the reinforcing tube beam is located below the rear longitudinal beam body.

2. The leaf spring bearing point body reinforcement structure according to claim 1, characterized in that, The upper part of the leaf spring suspending front bracket is snapped onto both sides of the rear longitudinal beam body and welded and fixedly connected to the rear longitudinal beam body.

3. The leaf spring bearing point body reinforcement structure according to claim 1, characterized in that, It also includes a reinforcing plate, which is fixed to the inner side of the rear longitudinal beam body and together with the leaf spring suspension front bracket, adopts a three-layer welded structure to form an integral reinforced connection.

4. The leaf spring bearing point body reinforcement structure according to claim 3, characterized in that, The reinforcing plate has a U-shaped structure.

5. The leaf spring bearing point body reinforcement structure according to any one of claims 1 to 4, characterized in that, Both ends of the reinforced tube beam are welded and fixed to the front bracket of the leaf spring suspension using carbon dioxide shielded welding.

6. The leaf spring bearing point body reinforcement structure according to any one of claims 1 to 4, characterized in that, The rear longitudinal beam body is provided with reinforcing ribs at key positions near the leaf spring suspension front bracket.

7. A method for manufacturing a leaf spring bearing point body reinforcement structure according to any one of claims 1 to 6, characterized in that, Includes the following steps: S1. Install the leaf spring suspension front bracket on the rear longitudinal beam body; snap the upper part of the leaf spring suspension front bracket to both sides of the rear longitudinal beam body and fix it by spot welding; S2. Install reinforcing plates on the rear longitudinal beam body; S3. Insert the reinforcing tube beam into the mounting hole of the leaf spring suspension front bracket, and then weld the reinforcing tube beam to the leaf spring suspension front bracket.

8. The manufacturing method according to claim 7, characterized in that, In step S2, the reinforcing plate is positioned inside the rear longitudinal beam body to form a three-layer welded structure with the leaf spring suspension front bracket.

9. The manufacturing method according to claim 7, characterized in that, In step S3, after the reinforcing tube beam is positioned by the clamp, four arc-shaped welds are performed on the inner and outer sides using carbon dioxide shielded welding to weld the reinforcing tube beam to the leaf spring suspension front bracket.

10. A vehicle, characterized in that, The vehicle body reinforcement structure includes the leaf spring bearing point as described in any one of claims 1 to 6.

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