Rear wheel cover reinforcing structure and design method thereof

Abstract

The invention discloses a rear wheel cover reinforcing structure and a design method thereof, and the rear wheel cover reinforcing structure comprises an inner plate reinforcing structure arranged on a rear wheel cover inner plate and an outer plate reinforcing structure arranged on a rear wheel cover outer plate, the inner plate reinforcing structure comprises an inner plate main reinforcing structure extending from the upper portion of the rear wheel cover inner plate to the lower portion of the rear wheel cover inner plate and an inner plate auxiliary reinforcing structure fixed to the inner plate main reinforcing structure. The outer plate reinforcing structure comprises an outer plate main reinforcing structure extending from the upper portion of the rear wheel cover outer plate to the lower portion of the rear wheel cover outer plate and an outer plate auxiliary reinforcing structure fixed to the outer plate main reinforcing structure. The inner plate main reinforcing structure provides main reinforcing support for the rear wheel cover inner plate. The inner plate auxiliary reinforcing structure can disperse part of load borne by the rear wheel cover to the D column, and deformation generated when the rear wheel cover is excited by the rear shock absorber is reduced. The outer plate auxiliary reinforcing structure transmits the load borne by the rear wheel cover to the C column, the overall strength of the vehicle body structure is enhanced, deformation generated when the rear wheel cover is excited by the rear shock absorber is reduced, and the deformation resistance of the rear wheel cover is improved.

Description

Technical Field

[0001] The invention relates to the technical field of automobile structure design, in particular to a rear wheel cover reinforcement structure and a design method thereof. Background Art

[0002] The rear wheel arch reinforcement structure plays a key role in automobile design, especially in improving the dynamic stiffness of the rear shock absorber and the torsional stiffness of the vehicle body. The design of the rear wheel arch reinforcement structure not only affects the appearance of the vehicle, but is also directly related to the vehicle's handling performance and driving stability.

[0003] First, the reinforced structure of the rear wheel cover can effectively improve the dynamic stiffness of the rear shock absorber: dynamic stiffness refers to the resistance of the structure to deformation under the action of dynamic excitation force. Through reasonable design and material selection, the reinforced structure of the rear wheel cover can reduce the vibration and impact of the rear shock absorber during driving, thereby improving its working efficiency and response speed. This improvement is not only conducive to improving the comfort of the vehicle, but also enhances the stability of the vehicle when driving at high speed or in complex road conditions.

[0004] Secondly, the structural reinforcement of the rear wheel arch also has a significant impact on the torsional rigidity of the vehicle body: the torsional rigidity of the vehicle body refers to the ability of the vehicle body to resist deformation when subjected to torsional torque. Simply put, when the vehicle is driving on a rough road, or when turning, accelerating, braking, etc., the vehicle body will be subjected to various torsional forces. If the torsional rigidity of the vehicle body is insufficient, the vehicle body will be twisted and deformed, affecting the vehicle's handling stability, safety and ride comfort. By adding reinforcing ribs or using high-strength materials in the rear wheel arch area, the overall rigidity of the vehicle body can be effectively improved and the deformation of the vehicle body during tilting can be reduced. This increase in rigidity enables the vehicle to better maintain its body posture when turning, reduce roll, and thus improve the safety of operation and the accuracy of manipulation.

[0005] In summary, the reinforcement structure of the rear wheel cover in automobile design is not only to meet the needs of aesthetics, but also a key factor in improving vehicle performance. By optimizing the structural design of the rear wheel cover, the dynamic stiffness of the rear shock absorber and the torsional stiffness of the vehicle body can be significantly improved, thereby improving the overall performance and driving experience of the vehicle.

[0006] The current status of the existing rear wheel cover reinforcement structure and its design is as follows:

[0007] "H"-shaped stamped rib structure: Some rear wheel cover reinforcement structures will adopt a "H"-shaped stamped rib design. The upper ends of this structure intersect, and the two ribs are connected to different parts of the body respectively. For example, the lower end of one rib is connected to the intersection of the floor crossbeam and the body longitudinal beam, and the lower end of the other rib is connected to the body longitudinal beam. This design can form two complete load transfer paths, improve the strength, torsion resistance and bending resistance of the structure, and can be applied to a car body with a larger mass to improve the load-bearing capacity of the car body.

[0008] Bracket structure: It includes some bracket bodies with a concave middle part and a concave structure extending outwards on all sides. The upper end of the bracket body is connected to the D-pillar inner reinforcement plate of the vehicle body, the upper cross beam of the rear inner skin of the side panel, etc., and the lower end is connected to the top of the rear wheel cover to strengthen the sensitive area on the top of the rear wheel cover, thereby improving the overall support stiffness of the rear wheel cover.

[0009] Reinforcement panel assembly structure: A reinforcement panel assembly composed of multiple components, such as a bilaterally symmetrical inner panel reinforcement and a seat mounting crossbeam connecting the two inner panel reinforcements. This structure can not only improve the dynamic stiffness of the rear shock absorber mounting point and the torsional mode of the body-in-white, but also support the rear wheel cover and strengthen the connection between the rear wheel cover and the floor, effectively improving the structural stiffness of the rear wheel cover.

[0010] At present, the above-mentioned different rear wheel cover reinforcement structures are selected according to different vehicles and requirements and installed on the vehicle body. Although the reinforcement requirements of the rear wheel cover structure and the torsional stiffness requirements of the vehicle body are met to a certain extent, since the reinforcement structure of the rear wheel cover is not specifically designed according to the dynamic stiffness of the rear shock absorber, the rear wheel cover reinforcement structure cannot meet the dynamic stiffness requirements of the shock absorber after being assembled on the actual vehicle body, and the deformation amount generated in some areas of the rear wheel cover is greater than the set value. Summary of the invention

[0011] The purpose of the present invention is to solve the deficiencies of the above-mentioned background technology and to provide a rear wheel cover reinforcement structure and a design method thereof which are specifically designed for the dynamic stiffness of the shock absorber and meet the dynamic stiffness requirements of the shock absorber.

[0012] To achieve this purpose, the rear wheel cover reinforcement structure designed by the present invention includes an inner plate reinforcement structure arranged on the inner plate of the rear wheel cover and an outer plate reinforcement structure arranged on the outer plate of the rear wheel cover, wherein the inner plate reinforcement structure includes an inner plate main reinforcement structure extending from the upper part to the lower part of the inner plate of the rear wheel cover and an inner plate auxiliary reinforcement structure fixed to the inner plate main reinforcement structure, wherein the inner plate auxiliary reinforcement structure includes a first inner plate auxiliary reinforcement plate for transmitting the load on the rear wheel cover to the D-pillar and a second inner plate auxiliary reinforcement plate for reducing the deformation of the rear wheel cover caused by the excitation of the rear shock absorber; the outer plate reinforcement structure includes an outer plate main reinforcement structure extending from the upper part to the lower part of the outer plate of the rear wheel cover and an outer plate auxiliary reinforcement structure fixed to the outer plate main reinforcement structure, wherein the outer plate auxiliary reinforcement structure includes a first outer plate auxiliary reinforcement plate for transmitting the load on the rear wheel cover to the C-pillar and a second outer plate auxiliary reinforcement plate for reducing the deformation of the rear wheel cover caused by the excitation of the rear shock absorber. The inner plate main reinforcement structure extends from the upper part to the lower part of the inner plate of the rear wheel cover, providing the main reinforcement support for the inner plate of the rear wheel cover. Its position and extension direction ensure the overall reinforcement of different height positions of the inner panel, and can effectively resist stress from different directions. The first inner panel auxiliary reinforcement plate can disperse part of the load borne by the rear wheel cover to the D-pillar, thereby reducing the burden on the rear wheel cover and improving the stability of the entire body structure. The second inner panel auxiliary reinforcement plate is used to reduce the deformation of the rear wheel cover caused by the excitation of the rear shock absorber. Since the rear shock absorber will generate vibration and impact force during the driving process of the vehicle, the second inner panel auxiliary reinforcement plate can effectively absorb and disperse these forces, reduce the deformation of the rear wheel cover, and improve the ride comfort and handling stability of the vehicle. The outer panel main reinforcement structure is similar to the inner panel main reinforcement structure, extending from the upper part to the lower part of the rear wheel cover outer panel, providing the main reinforcement support for the rear wheel cover outer panel. The first outer panel auxiliary reinforcement plate transfers the load borne by the rear wheel cover to the C-pillar, disperses the load to the C-pillar, and enhances the overall strength of the body structure. The second outer panel auxiliary reinforcement plate is used to reduce the deformation of the rear wheel cover caused by the excitation of the rear shock absorber, and further improve the anti-deformation ability of the rear wheel cover. The load on the rear wheel cover is transferred to the D-pillar and C-pillar respectively through the auxiliary reinforcement plates of the inner panel and the outer panel, which effectively disperses the load on the rear wheel cover, reduces local stress concentration, and improves the overall bearing capacity of the vehicle body structure. The second auxiliary reinforcement plates of the inner panel and the outer panel can significantly reduce the deformation of the rear wheel cover for the excitation effect of the rear shock absorber. This not only helps to improve the ride comfort of the vehicle, but also ensures the connection stability between the rear wheel cover and other components, and prolongs the service life of the vehicle. The main reinforcement structure of the inner panel and the outer panel and the auxiliary reinforcement structure cooperate with each other to form a complete rear wheel cover reinforcement system. This design can improve the rigidity and strength of the rear wheel cover, and enhance the handling stability and safety of the vehicle during driving. The rear wheel cover reinforcement structure designed by the present invention has broad application prospects in the field of automotive engineering.As the automotive industry continues to increase its requirements for vehicle performance and safety, this innovative design can provide automakers with an effective solution to meet consumers' demand for high-quality cars. At the same time, the design can also support the lightweighting of vehicles. Through reasonable material selection and structural optimization, the rear wheel cover strength can be improved while the body weight can be reduced, thus reducing energy consumption and emissions.

[0013] Furthermore, the first inner panel auxiliary reinforcement plate and the second inner panel auxiliary reinforcement plate are both cavity structures with flanges on all sides. This structural design increases the structural stability of the first inner panel auxiliary reinforcement plate and the second inner panel auxiliary reinforcement plate. The flanges can provide additional support and rigidity, so that the reinforcement plate is not easily deformed when bearing loads. The flanges can also enhance the connection strength between the reinforcement plate and the rear wheel cover inner panel. Through welding or other connection methods, the flanges can be better combined with the inner panel to improve the reliability of the connection. The cavity structure has higher strength and rigidity. Compared with the solid structure, the cavity structure can provide better mechanical properties without adding too much weight. The cavity can be filled with sound-absorbing materials or other functional materials to achieve functions such as noise reduction and heat insulation. This is of positive significance for improving the ride comfort and performance of the vehicle. The combination of flanges on all sides and the cavity structure makes the reinforcement plate have higher strength and rigidity, and can better withstand the load on the rear wheel cover. This helps to reduce the deformation of the rear wheel cover and improve the overall structural stability of the vehicle.

[0014] Furthermore, the first inner panel auxiliary reinforcement plate includes an inner panel rear reinforcement plate whose front side is fixedly connected to the inner panel main reinforcement structure and whose rear side is fixedly connected to the D-pillar installation area of ​​the rear wheel cover. The inner panel rear reinforcement plate in the first inner panel auxiliary reinforcement plate is located at a specific position of the inner panel of the rear wheel cover. Its front side is fixedly connected to the inner panel main reinforcement structure, and its rear side is fixedly connected to the D-pillar installation area of ​​the rear wheel cover. This connection method makes the inner panel rear reinforcement plate an important connecting link between the inner panel main reinforcement structure and the D-pillar, which helps to more effectively transfer the load on the rear wheel cover to the D-pillar. The fixed connection between the front side of the inner panel rear reinforcement plate and the inner panel main reinforcement structure enhances the integrity of the entire rear wheel cover inner panel reinforcement structure. The inner panel main reinforcement structure usually bears the main reinforcement role. After the inner panel rear reinforcement plate is connected to it, it can further strengthen the performance of the inner panel main reinforcement structure and jointly resist stress and load from different directions. The fixed connection between the rear side of the inner panel rear reinforcement plate and the D-pillar installation area ensures that the load on the rear wheel cover can be smoothly transferred to the D-pillar. As an important part of the body structure, the D-pillar has high strength and rigidity. It can bear and disperse the load from the rear wheel arch and improve the overall stability of the body.

[0015] Furthermore, the inner panel rear reinforcement plate is arranged at the upper part of the rear wheel housing inner panel. Since the rear side of the inner panel rear reinforcement plate is fixedly connected to the D-pillar installation area of ​​the rear wheel housing, arranging it at the upper part of the inner panel closer to the D-pillar can shorten the load transfer path and make the load on the rear wheel housing more efficiently transferred to the D-pillar. In this way, energy loss and structural deformation in the transmission process can be reduced, and the stability of the vehicle body structure can be improved. Being close to the D-pillar is also conducive to the connection design with the D-pillar, making the connection more firm and reliable and able to withstand greater loads. The upper part of the rear wheel housing inner panel is usually an area that is subjected to greater stress, especially during the driving of the vehicle, the impact from the road surface, the vibration of the vehicle, and the torsion of the vehicle body will all generate greater forces on the upper part of the rear wheel housing. Arranging the inner panel rear reinforcement plate here can specifically enhance the strength of the upper part of the rear wheel housing inner panel and improve the deformation resistance of the entire rear wheel housing. For some models with higher bodies or higher centers of gravity, the strength of the upper part of the rear wheel housing is particularly important, because these models are more susceptible to roll and shaking during driving. The arrangement of the inner panel rear reinforcement plate can effectively improve the stability and safety of the vehicle body. The rear reinforcement plate of the lining arranged at the upper part cooperates with other reinforcement structures to improve the overall torsional rigidity and bending rigidity of the vehicle body. This is of great significance for improving the vehicle's handling performance, reducing body vibration and noise, and improving ride comfort. In the event of a collision, the reinforcement structure on the upper part of the rear wheel housing can better disperse the collision energy and protect the safety of the passengers in the vehicle. The presence of the rear reinforcement plate of the lining can enhance the impact resistance of this area and improve the collision safety of the vehicle body. Placing the rear reinforcement plate of the lining at the upper part of the rear wheel housing lining also has certain advantages in the production, manufacturing, and maintenance of the vehicle. Since the upper part is relatively open, it is easier to perform operations such as installation and welding, thereby improving production efficiency. In later maintenance and overhaul, it is also easier to inspect and replace the rear reinforcement plate of the lining, thereby reducing maintenance costs and difficulty.

[0016] Furthermore, the second inner panel auxiliary reinforcement plate includes an inner panel front reinforcement plate whose rear side is fixedly connected to the inner panel main reinforcement structure and whose front side is fixedly connected to the front part of the rear wheel housing inner panel. The inner panel front reinforcement plate in the second inner panel auxiliary reinforcement plate is located at a specific position, whose rear side is fixedly connected to the inner panel main reinforcement structure and whose front side is fixedly connected to the front part of the rear wheel housing inner panel. This connection method makes the inner panel front reinforcement plate a connecting bridge between the inner panel main reinforcement structure and the front part of the rear wheel housing inner panel, which helps to enhance the overall structural strength of the rear wheel housing inner panel. The fixed connection between the rear side of the inner panel front reinforcement plate and the inner panel main reinforcement structure further enhances the performance of the inner panel main reinforcement structure. The inner panel main reinforcement structure usually plays the main reinforcement role. After the inner panel front reinforcement plate is connected to it, it can jointly resist stress and load from different directions and improve the overall stability of the rear wheel housing inner panel. The fixed connection between the front side of the inner panel front reinforcement plate and the front part of the rear wheel housing inner panel specifically enhances the strength of the front part of the rear wheel housing inner panel. The front part of the rear wheel cover inner panel will also bear various loads during the driving process of the vehicle, such as road impact, inertia force during vehicle braking, etc. The existence of the inner panel front reinforcement plate can reduce the deformation and damage risk of this part. The arrangement of the inner panel front reinforcement plate can more evenly distribute the load on the rear wheel cover to the inner panel main reinforcement structure and other parts of the rear wheel cover inner panel. This can reduce local stress concentration and improve the overall bearing capacity of the rear wheel cover. In particular, during the driving process of the vehicle, the rear wheel cover will be subjected to dynamic loads from different directions. The inner panel front reinforcement plate can work in conjunction with other reinforcement structures to effectively disperse these loads and protect the integrity of the rear wheel cover and the vehicle body structure. Since the inner panel front reinforcement plate is fixedly connected to the front part of the rear wheel cover inner panel and connected to the inner panel main reinforcement structure, it can reduce the deformation of the rear wheel cover caused by the excitation of the rear shock absorber. The rear shock absorber will generate vibration and impact force during the driving process of the vehicle, and these forces will be transmitted to the rear wheel cover. The inner panel front reinforcement plate can absorb and disperse part of the force, reduce the deformation of the rear wheel cover, and improve the ride comfort and handling stability of the vehicle. The front reinforcement plate of the inner panel cooperates with the main reinforcement structure of the inner panel and other auxiliary reinforcement structures to form a complete rear wheel cover reinforcement system. This system can improve the rigidity and strength of the rear wheel cover and enhance the handling stability and safety of the vehicle during driving. This reinforcement structure is particularly important for some high-performance vehicles or vehicles that often drive under harsh road conditions. It can ensure that the rear wheel cover can remain stable and will not be excessively deformed or damaged when the vehicle is driving at high speed, making sharp turns or passing through rough roads.

[0017] Further, the front reinforcement plate of the inner panel includes at least two upper front reinforcement plates of the inner panel and lower front reinforcement plates of the inner panel arranged up and down. The front reinforcement plate of the inner panel is divided into at least two upper front reinforcement plates of the inner panel and lower front reinforcement plates of the inner panel arranged up and down. This design can more finely reinforce the front of the rear wheel cover inner panel. The reinforcement plates at different positions can be optimized for loads and stresses at different heights to improve the reinforcement effect. The upper and lower arrangements can also better adapt to the shape and space requirements of the front of the rear wheel cover inner panel, making the installation of the reinforcement plate more reasonable and compact. The combination of at least two reinforcement plates increases the flexibility of the design. The number, size and shape of the reinforcement plates can be adjusted according to the needs and actual conditions of different models to achieve the best reinforcement effect. The combination of multiple reinforcement plates can also improve the reliability of the reinforcement structure. If one of the reinforcement plates is damaged or fails, the other reinforcement plates can still continue to play a certain reinforcement role, reducing the risk of serious deformation of the rear wheel cover. The upper front reinforcement plate of the inner panel and the lower front reinforcement plate of the inner panel can be reinforced at different height positions of the front of the rear wheel cover inner panel. For example, the front reinforcement plate on the inner panel can better withstand the load and stress from above, while the front reinforcement plate under the inner panel can enhance the support for the lower area. This local reinforcement can more effectively reduce the deformation and damage of the front part of the inner panel of the rear wheel cover when subjected to various loads, and improve the overall structural strength and stability of the vehicle. Multiple reinforcement plates arranged up and down can better disperse the load on the rear wheel cover. Reinforcement plates of different heights can transfer the load to different parts, avoid local stress concentration, and improve the bearing capacity of the rear wheel cover. By optimizing the load distribution, the impact on other components can also be reduced, and the coordination and reliability of the entire body structure can be improved. In the event of a collision, the front reinforcement plate on the inner panel can absorb and disperse the collision energy. The combination of multiple reinforcement plates can increase the absorption area and transmission path of the collision energy, and reduce the degree of damage to the passengers in the car caused by the collision. Especially for frontal collisions, the front reinforcement plate on the inner panel and the front reinforcement plate under the inner panel can work together with other body structures to resist the collision force and improve the collision safety of the vehicle.

[0018] Furthermore, the first outer panel auxiliary reinforcement plate and the second outer panel auxiliary reinforcement plate are both cavity structures with flanges on all sides. The design with flanges on all sides increases the structural stability of the first outer panel auxiliary reinforcement plate and the second outer panel auxiliary reinforcement plate. The flanges can provide additional support and rigidity, so that the reinforcement plate is not easily deformed when subjected to external forces. The flanges can also enhance the connection strength between the reinforcement plate and the outer panel of the rear wheel housing, thereby improving the reliability of the entire structure. Through welding or other connection methods, the flanges can be better combined with the outer panel to ensure that there will be no loosening or separation during the driving of the vehicle. The cavity structure has higher strength and rigidity. Compared with the solid structure, the cavity structure can provide better mechanical properties without adding too much weight. The cavity can be filled with sound-absorbing materials or other functional materials to achieve functions such as noise reduction and heat insulation. The cavity structure can also optimize the force distribution of the reinforcement plate, so that the external force can be more evenly distributed to the entire structure, reduce local stress concentration, and increase the service life of the reinforcement plate.

[0019] Further, the first outer panel auxiliary reinforcement plate includes an outer panel front reinforcement plate fixedly connected to the outer panel main reinforcement structure at the rear side and fixedly connected to the C-pillar installation area of ​​the rear wheel cover at the front side. The outer panel front reinforcement plate in the first outer panel auxiliary reinforcement plate is in a specific position. The rear side is fixedly connected to the outer panel main reinforcement structure, and the front side is fixedly connected to the C-pillar installation area of ​​the rear wheel cover. This connection method makes the outer panel front reinforcement plate an important connection part between the outer panel main reinforcement structure and the C-pillar, which helps to transfer the load on the rear wheel cover to the C-pillar and enhance the stability of the vehicle body structure. The fixed connection between the rear side and the outer panel main reinforcement structure strengthens the performance of the outer panel main reinforcement structure. The outer panel main reinforcement structure usually bears the main reinforcement role. After the outer panel front reinforcement plate is connected to it, it can further improve the strength and rigidity of the outer panel main reinforcement structure and jointly resist stress and load from different directions. The fixed connection between the front side and the C-pillar installation area ensures that the load on the rear wheel cover can be smoothly transferred to the C-pillar. As an important part of the vehicle body structure, the C-pillar has high strength and rigidity, can bear and disperse the load from the rear wheel cover, and improve the overall bearing capacity of the vehicle body.

[0020] Furthermore, the second outer panel auxiliary reinforcement plate includes an outer panel rear reinforcement plate whose front side is fixedly connected to the outer panel main reinforcement structure and whose rear side is fixedly connected to the rear part of the rear wheel cover outer panel. The outer panel rear reinforcement plate in the second outer panel auxiliary reinforcement plate has a specific position layout. Its front side is fixedly connected to the outer panel main reinforcement structure, and its rear side is fixedly connected to the rear part of the rear wheel cover outer panel. This connection mode enables the outer panel rear reinforcement plate to structurally connect the outer panel main reinforcement structure with the rear part of the rear wheel cover outer panel, which helps to enhance the overall structural strength and stability of the rear wheel cover outer panel. The fixed connection between the front side and the outer panel main reinforcement structure further enhances the performance of the outer panel main reinforcement structure. The outer panel main reinforcement structure usually undertakes the main reinforcement task. After the outer panel rear reinforcement plate is connected to it, it can jointly resist stress and load from different directions, and improve the strength of the rear wheel cover outer panel in this area. The fixed connection between the rear side and the rear part of the rear wheel cover outer panel specifically enhances the strength of the rear part of the rear wheel cover outer panel. The rear part of the rear wheel cover outer panel will also bear various loads during the driving process of the vehicle, such as road impact, vibration during driving of the vehicle, etc. The presence of the rear reinforcement plate of the outer panel can reduce the risk of deformation and damage in this area.

[0021] Furthermore, a design method for a rear wheel cover reinforcement structure includes constructing a rear wheel cover simulation model, applying a load to a rear shock absorber mounting point of the rear wheel cover simulation model, confirming a structural weakness of the rear wheel cover simulation model, setting a rear wheel cover auxiliary reinforcement structure at the structural weakness of the rear wheel cover simulation model, determining whether the rear wheel cover simulation model provided with the rear wheel cover auxiliary reinforcement structure meets the structural strength requirements when subjected to the rear shock absorber load, and if not, modifying and optimizing the rear wheel cover auxiliary reinforcement structure until the rear wheel cover simulation model provided with the rear wheel cover auxiliary reinforcement structure meets the structural strength requirements when subjected to the rear shock absorber load. Constructing a rear wheel cover simulation model is a basic step in the design. By using professional computer-aided engineering (CAE) software, a virtual model of the rear wheel cover is established. This model can accurately reflect the geometric shape, material properties and connection relationship of the rear wheel cover with other components. Constructing a simulation model requires collecting detailed design parameters and material properties of the rear wheel cover to ensure the accuracy and reliability of the model. Apply a specific load to the rear shock absorber mounting point of the established rear wheel cover simulation model. These loads simulate the forces exerted by the rear shock absorber on the rear wheel cover during actual driving of the vehicle, including static loads and dynamic loads. Accurately determining the size, direction and loading method of the load is crucial for subsequent analysis and design. By analyzing the simulation model of the rear wheel cover after the load is applied, the structural weak points in the model are determined. These weak points are usually areas that are prone to large deformation, stress concentration or damage under the action of load. Analysis methods may include finite element analysis, stress analysis, etc. to accurately determine the location and nature of the weak points. Auxiliary reinforcement structures for the rear wheel cover are set at the confirmed structural weak points. These reinforcement structures can be designed according to the specific weak point conditions, including reinforcement plates, ribs, brackets and other forms. When designing the reinforcement structure, factors such as reinforcement effect, weight increase, and manufacturing process need to be considered to achieve the optimal design solution. The simulation model with the auxiliary reinforcement structure for the rear wheel cover is analyzed again to determine whether it meets the structural strength requirements when subjected to the load of the rear shock absorber. Structural strength requirements usually include indicators such as deformation, stress level, and fatigue life. If the requirements are not met, the auxiliary reinforcement structure of the rear wheel cover needs to be modified and optimized, and the above steps are repeated until the structural strength requirements are met. By designing with simulation models, multiple iterations and optimizations can be quickly performed on the computer, greatly improving design efficiency. Compared with traditional test methods, it saves time and cost. Problems can be found and optimized in the early stages of design, avoiding rework and modifications after problems occur during actual manufacturing and testing. The simulation model can accurately simulate the behavior of the rear wheel cover under actual loads and provide detailed information such as stress and deformation. This enables designers to more accurately determine structural weaknesses and optimize and strengthen the structure. Various complex load conditions and boundary conditions can be considered to improve the reliability and accuracy of the design.The design method allows designers to continuously modify and optimize the auxiliary reinforcement structure of the rear wheel arch to achieve the best reinforcement effect. The balance between performance and cost can be achieved by adjusting the shape, size, material and other parameters of the reinforcement structure. Multi-objective optimization can be performed, taking into account factors such as structural strength, weight, and manufacturing process to obtain the best design solution.

[0022] The beneficial effects of the present invention are as follows: in the present invention, the main reinforcement structure of the inner plate extends from the upper part to the lower part of the rear wheel housing inner plate, providing the main reinforcement support for the rear wheel housing inner plate. Its position and extension direction ensure the overall reinforcement of the inner plate at different height positions, and can effectively resist stress from different directions. The first inner plate auxiliary reinforcement plate can disperse part of the load borne by the rear wheel housing to the D-pillar, thereby reducing the burden on the rear wheel housing and improving the stability of the entire vehicle body structure. The second inner plate auxiliary reinforcement plate is used to reduce the deformation of the rear wheel housing caused by the excitation of the rear shock absorber. Since the rear shock absorber generates vibration and impact force during the driving process of the vehicle, the second inner plate auxiliary reinforcement plate can effectively absorb and disperse these forces, reduce the deformation of the rear wheel housing, and improve the ride comfort and handling stability of the vehicle. The outer plate main reinforcement structure is similar to the inner plate main reinforcement structure, extending from the upper part to the lower part of the rear wheel housing outer plate, providing the main reinforcement support for the rear wheel housing outer plate. The first outer plate auxiliary reinforcement plate transfers the load borne by the rear wheel housing to the C-pillar, disperses the load to the C-pillar, and enhances the overall strength of the vehicle body structure. The second outer panel auxiliary reinforcement plate is used to reduce the deformation of the rear wheel cover caused by the excitation of the rear shock absorber, and further improve the deformation resistance of the rear wheel cover. The load on the rear wheel cover is transmitted to the D-pillar and the C-pillar respectively through the auxiliary reinforcement plates of the inner panel and the outer panel, which effectively disperses the load of the rear wheel cover, reduces the local stress concentration, and improves the overall bearing capacity of the vehicle body structure. The second auxiliary reinforcement plates of the inner panel and the outer panel can significantly reduce the deformation of the rear wheel cover in response to the excitation of the rear shock absorber. This not only helps to improve the riding comfort of the vehicle, but also ensures the connection stability of the rear wheel cover with other components and prolongs the service life of the vehicle. The main reinforcement structure of the inner panel and the outer panel and the auxiliary reinforcement structure cooperate with each other to form a complete rear wheel cover reinforcement system. This design can improve the rigidity and strength of the rear wheel cover and enhance the handling stability and safety of the vehicle during driving. The rear wheel cover reinforcement structure designed by the present invention has broad application prospects in the field of automotive engineering. As the automotive industry continues to increase its requirements for vehicle performance and safety, this innovative design can provide an effective solution for automakers to meet consumers' demand for high-quality cars. At the same time, this design can also provide support for lightweighting of vehicles. Through reasonable material selection and structural optimization, it can improve the strength of the rear wheel cover while reducing the weight of the vehicle body, thereby reducing energy consumption and emissions. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a front view of the inner plate reinforcement structure of the rear wheel cover in the present invention;

[0024] Figure 2 A front view of the outer plate reinforcement structure of the rear wheel cover of the present invention;

[0025] Figure 3 for Figure 1 Middle AA section view;

[0026] Figure 4 is a flow chart of a design method of a rear wheel cover reinforcement structure in the present invention;

[0027] Among them, 1 is the main reinforcement structure of the inner panel, 2 is the rear reinforcement plate of the inner panel, 3 is the upper front reinforcement plate of the inner panel, 4 is the lower front reinforcement plate of the inner panel, 5 is the middle reinforcement plate of the inner panel, 6 is the sealing plate of the inner panel, 7 is the rear reinforcement plate of the inner panel, 8 is the front reinforcement plate of the inner panel, 9 is the front reinforcement plate of the outer panel, 10 is the main reinforcement structure of the outer panel, 11 is the rear reinforcement plate of the outer panel, 12 is the inner panel of the rear wheel cover, 13 is the outer panel of the rear wheel cover, 14 is the rear floor, and 15 is the rear shock absorber mounting plate. DETAILED DESCRIPTION

[0028] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. In the description of the present invention, it should be understood that the orientations or positional relationships indicated by the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc. are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention.

[0029] The design method of the rear wheel cover reinforcement structure designed by the present invention includes constructing a rear wheel cover simulation model, applying a load to the rear shock absorber installation point of the rear wheel cover simulation model, confirming the structural weak points of the rear wheel cover simulation model, setting a rear wheel cover auxiliary reinforcement structure at the structural weak points of the rear wheel cover simulation model, and determining whether the rear wheel cover simulation model provided with the rear wheel cover auxiliary reinforcement structure meets the structural strength requirements when subjected to the rear shock absorber load; if not, modifying and optimizing the rear wheel cover auxiliary reinforcement structure until the rear wheel cover simulation model provided with the rear wheel cover auxiliary reinforcement structure meets the structural strength requirements when subjected to the rear shock absorber load.

[0030] like Figure 4 As shown, in some embodiments, the design method of the rear wheel cover reinforcement structure includes the following steps:

[0031] S1. Constructing a rear shock absorber installation point dynamic stiffness analysis model: constructing a rear wheel cover simulation model, including the inner and outer panels of the rear wheel cover, the reinforcing structure arranged on the inner and outer panels of the rear wheel cover, and the rear shock absorber installation plate 15 fixed to the bottom of the rear wheel cover.

[0032] S2. Simulation analysis and result confirmation: Apply load to the rear shock absorber mounting point of the rear wheel cover simulation model, that is, Figure 3 Apply excitation in the X / Y / Z directions at the middle arrow position to calculate the dynamic stiffness of the rear shock absorber within a certain frequency range. The excitation magnitude is designed based on the excitation data of the rear shock absorber during actual driving, and the driving state of the actual vehicle is simulated as much as possible.

[0033] S3, optimization plan and confirmation: Based on the results of S2, the structural weak points of the rear wheel cover simulation model can be confirmed. The structural weak points of the rear wheel cover simulation model can be confirmed by comparing the dynamic stiffness value of the rear shock absorber calculated by S2 with the set threshold, that is, where to add reinforcements to the rear wheel cover simulation model so that the dynamic stiffness value of the rear shock absorber meets the requirements.

[0034] S4, structural optimization and data design: According to the results of S3, the rear wheel cover auxiliary reinforcement structure is set at the structural weak points of the rear wheel cover simulation model, for example: design Figure 1 —2 includes the structural dimensions, arrangement positions and structural forms of the rear inner panel reinforcement plate 2, the inner panel upper front reinforcement plate 3, the inner panel lower front reinforcement plate 4, the outer panel front reinforcement plate 9 and the outer panel rear reinforcement plate 11.

[0035] S5. Update and analysis of the analysis model after optimization: Determine whether the simulation model of the rear wheel cover with the auxiliary reinforcement structure of the rear wheel cover meets the structural strength requirements when subjected to the rear shock absorber load. After adding the auxiliary reinforcement structure of the rear wheel cover to the simulation model of the rear wheel cover, the simulation model of the rear wheel cover can be updated and analyzed again. Figure 3 Apply excitation in the X / Y / Z directions at the position of the middle arrow, and calculate the dynamic stiffness of the rear shock absorber within a certain frequency range.

[0036] S6. Confirm whether the analysis results meet the target value: Based on the calculation results of S5, it can be determined whether the dynamic stiffness value of the rear shock absorber meets the requirements. If not, return to S3 to modify and optimize the rear wheel cover auxiliary reinforcement structure until the rear wheel cover simulation model with the rear wheel cover auxiliary reinforcement structure meets the structural strength requirements when subjected to the rear shock absorber load.

[0037] A certain rear wheel cover reinforcement structure designed based on the above-mentioned rear wheel cover reinforcement structure design method:

[0038] like Figure 1—2, the rear wheel cover reinforcement structure includes an inner panel reinforcement structure arranged on the rear wheel cover inner panel 12 and an outer panel reinforcement structure arranged on the rear wheel cover outer panel 13, the inner panel reinforcement structure includes an inner panel main reinforcement structure 1 extending from the upper side to the lower side of the rear wheel cover inner panel 12 and an inner panel auxiliary reinforcement structure fixed to the inner panel main reinforcement structure 1, the inner panel auxiliary reinforcement structure includes a first inner panel auxiliary reinforcement plate for transferring the load applied to the rear wheel cover to the D-pillar and a second inner panel auxiliary reinforcement plate for reducing the deformation of the rear wheel cover caused by the excitation of the rear shock absorber; the outer panel reinforcement structure includes an outer panel main reinforcement structure 10 extending from the upper side to the lower side of the rear wheel cover outer panel 13 and an outer panel auxiliary reinforcement structure fixed to the outer panel main reinforcement structure 10, the outer panel auxiliary reinforcement structure includes a first outer panel auxiliary reinforcement plate for transferring the load applied to the rear wheel cover to the C-pillar and a second outer panel auxiliary reinforcement plate for reducing the deformation of the rear wheel cover caused by the excitation of the rear shock absorber.

[0039] Embodiment 1

[0040] like Figure 1 As shown, based on the above rear wheel housing reinforcement structure, the main reinforcement structure 1 of the inner panel is optimized and designed: it includes an inner panel upper sealing plate 6 and an inner panel middle reinforcement plate 5 arranged up and down and fixed on the rear wheel housing inner panel 12, the bottom of the inner panel middle reinforcement plate 5 is fixedly connected with an inner panel rear reinforcement plate 7 and an inner panel front reinforcement plate 8, and the inner panel rear reinforcement plate 7 and the inner panel front reinforcement plate 8 are both overlapped and fixed with the rear floor 14. The inner panel upper sealing plate 6, the inner panel middle reinforcement plate 5, the inner panel rear reinforcement plate 7 and the inner panel front reinforcement plate 8 are all cavity structures with flanges.

[0041] Embodiment 2

[0042] like Figure 1 As shown, based on the first embodiment, the first inner panel auxiliary reinforcement plate and the second inner panel auxiliary reinforcement plate are optimized and designed: the first inner panel auxiliary reinforcement plate and the second inner panel auxiliary reinforcement plate are both cavity structures with flanges on all sides. The first inner panel auxiliary reinforcement plate is an inner panel rear reinforcement plate 2 fixedly connected to the inner panel main reinforcement structure 1 at the front side and to the D-pillar mounting area of ​​the rear wheel cover at the rear side. The inner panel rear reinforcement plate 2 is arranged on the upper part of the rear wheel cover inner panel 12. The second inner panel auxiliary reinforcement plate is an inner panel front reinforcement plate fixedly connected to the inner panel main reinforcement structure 1 at the rear side and to the front part of the rear wheel cover inner panel 12 at the front side. The inner panel front reinforcement plate includes two inner panel upper front reinforcement plates 3 and inner panel lower front reinforcement plates 4 arranged up and down.

[0043] Embodiment 3

[0044] like Figure 2As shown, based on the above-mentioned embodiment one or two, the outer panel main reinforcement structure 10 is structurally designed: a weight-reducing hole is opened on the outer panel main reinforcement structure 10, and it has flanges all around, and the interior is a cavity structure, which is welded and fixed on the rear wheel housing outer panel 13 from top to bottom, and is located between the C-pillar overlap area and the D-pillar overlap area of ​​the rear wheel housing outer panel 13.

[0045] Embodiment 4

[0046] like Figure 2 As shown, based on the above-mentioned embodiment 3, the first outer panel auxiliary reinforcement plate and the second outer panel auxiliary reinforcement plate are optimized and designed: the first outer panel auxiliary reinforcement plate and the second outer panel auxiliary reinforcement plate are both cavity structures with flanges on all sides. The first outer panel auxiliary reinforcement plate includes an outer panel front reinforcement plate 9 fixedly connected to the outer panel main reinforcement structure 10 at the rear side and fixedly connected to the C-pillar mounting area of ​​the rear wheel cover at the front side. The second outer panel auxiliary reinforcement plate includes an outer panel rear reinforcement plate 11 fixedly connected to the outer panel main reinforcement structure 10 at the front side and fixedly connected to the rear of the rear wheel cover outer panel 13 at the rear side.

[0047] In summary, the design method of the rear wheel cover reinforcement structure designed by the present invention, building a rear wheel cover simulation model is a basic step of the design, and a virtual model of the rear wheel cover is established by using professional computer-aided engineering (CAE) software. This model can accurately reflect the geometric shape, material properties and connection relationship of the rear wheel cover with other components. Building a simulation model requires collecting detailed design parameters and material properties of the rear wheel cover to ensure the accuracy and reliability of the model. Apply specific loads to the rear shock absorber mounting point of the established rear wheel cover simulation model. These loads simulate the forces generated by the rear shock absorber on the rear wheel cover during actual driving of the vehicle, including static loads and dynamic loads. Accurately determining the size, direction and loading method of the load is crucial for subsequent analysis and design. By analyzing the simulation model of the rear wheel cover after the load is applied, the structural weak points in the model are determined. These weak points are usually areas that are prone to large deformation, stress concentration or damage under the action of load. The analysis method may include finite element analysis, stress analysis, etc. to accurately determine the location and nature of the weak points. Set the rear wheel cover auxiliary reinforcement structure at the confirmed structural weak points. These reinforcement structures can be designed according to the specific weak points, including reinforcement plates, ribs, brackets and other forms. When designing the reinforcement structure, factors such as reinforcement effect, weight increase, and manufacturing process need to be considered to achieve the optimal design solution. The simulation model with the auxiliary reinforcement structure of the rear wheel cover is analyzed again to determine whether it meets the structural strength requirements when subjected to the rear shock absorber load. The structural strength requirements usually include indicators such as deformation, stress level, and fatigue life. If the requirements are not met, the auxiliary reinforcement structure of the rear wheel cover needs to be modified and optimized, and the above steps are repeated until the structural strength requirements are met. Designing through the simulation model can quickly perform multiple iterations and optimizations on the computer, greatly improving the design efficiency. Compared with traditional test methods, it saves time and cost. Problems can be found and optimized in the early stages of the design, avoiding rework and modification after problems occur during actual manufacturing and testing. The simulation model can accurately simulate the behavior of the rear wheel cover under actual loads and provide detailed information such as stress and deformation. This enables designers to more accurately determine structural weaknesses and optimize the reinforcement structure. Various complex load conditions and boundary conditions can be considered to improve the reliability and accuracy of the design. The design method allows designers to continuously modify and optimize the auxiliary reinforcement structure of the rear wheel arch to achieve the best reinforcement effect. The balance between performance and cost can be achieved by adjusting the shape, size, material and other parameters of the reinforcement structure. Multi-objective optimization can be performed, taking into account factors such as structural strength, weight, and manufacturing process to obtain the best design solution.

[0048] Based on the above design method, the rear wheel cover reinforcement structure designed by the present invention is arranged on the inner plate and outer plate of the rear wheel cover. The inner plate main reinforcement structure 1 extends from the upper part to the lower part of the rear wheel cover inner plate 12, providing the main reinforcement support for the rear wheel cover inner plate 12. Its position and extension direction ensure the overall reinforcement of the inner plate at different height positions, and can effectively resist stress from different directions. The first inner plate auxiliary reinforcement plate can disperse part of the load borne by the rear wheel cover to the D-pillar, thereby reducing the burden on the rear wheel cover and improving the stability of the entire vehicle body structure. The second inner plate auxiliary reinforcement plate is used to reduce the deformation of the rear wheel cover caused by the excitation of the rear shock absorber. Since the rear shock absorber generates vibration and impact force during the driving process of the vehicle, the second inner plate auxiliary reinforcement plate can effectively absorb and disperse these forces, reduce the deformation of the rear wheel cover, and improve the ride comfort and handling stability of the vehicle. The outer plate main reinforcement structure 10 is similar to the inner plate main reinforcement structure 1, extending from the upper part to the lower part of the rear wheel cover outer plate 13, providing the main reinforcement support for the rear wheel cover outer plate 13. The first outer panel auxiliary reinforcement plate transfers the load on the rear wheel cover to the C-pillar, distributes the load to the C-pillar, and enhances the overall strength of the vehicle body structure. The second outer panel auxiliary reinforcement plate is used to reduce the deformation of the rear wheel cover caused by the excitation of the rear shock absorber, and further improves the anti-deformation ability of the rear wheel cover. The load on the rear wheel cover is transferred to the D-pillar and the C-pillar respectively through the auxiliary reinforcement plates of the inner panel and the outer panel, which effectively disperses the load of the rear wheel cover, reduces local stress concentration, and improves the overall bearing capacity of the vehicle body structure. The second auxiliary reinforcement plates of the inner panel and the outer panel can significantly reduce the deformation of the rear wheel cover in response to the excitation of the rear shock absorber. This not only helps to improve the ride comfort of the vehicle, but also ensures the connection stability of the rear wheel cover with other components and prolongs the service life of the vehicle. The main reinforcement structure of the inner panel and the outer panel and the auxiliary reinforcement structure cooperate with each other to form a complete rear wheel cover reinforcement system. This design can improve the rigidity and strength of the rear wheel cover and enhance the handling stability and safety of the vehicle during driving. The rear wheel cover reinforcement structure designed by the present invention has broad application prospects in the field of automotive engineering. As the automotive industry continues to increase its requirements for vehicle performance and safety, this innovative design can provide automakers with an effective solution to meet consumers' demand for high-quality cars. At the same time, the design can also support the lightweighting of vehicles. Through reasonable material selection and structural optimization, the rear wheel cover strength can be improved while the body weight can be reduced, thus reducing energy consumption and emissions.

[0049] Here, it should be noted that the description of the above technical solution is exemplary, and this specification can be embodied in different forms and should not be interpreted as being limited to the technical solution set forth herein. On the contrary, providing these descriptions will make the disclosure of the present invention thorough and complete, and will fully convey the scope disclosed in this specification to those skilled in the art. In addition, the technical solution of the present invention is limited only by the scope of the claims. In the case of using "including", "having" and "comprising" described in this specification, another part or other parts may also be provided, and the terms used may generally be singular but may also represent plural forms. It should be noted that although the terms "first", "second", "top", "bottom", "one side", "other side", "one end", "other end", etc. may appear and be used in this specification to describe various components, these components and parts should not be limited by these terms. These terms are only used to distinguish one component and part from another component and part. For example, without departing from the scope of this specification, the first component may be referred to as the second component, and similarly, the second component may be referred to as the first component, and the components at the top and bottom may also be interchanged or converted with each other under certain circumstances; the components at one end and the other end may have the same or different performances.

[0050] Finally, it should be pointed out that the above embodiments are only representative examples of the present invention. Obviously, the present invention is not limited to the above embodiments, and there are many variations. Any simple modification, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention should be considered to belong to the protection scope of the present invention.

Claims

1. A rear wheel housing reinforcement structure, comprising an inner plate reinforcement structure arranged on an inner plate (12) of the rear wheel housing and an outer plate reinforcement structure arranged on an outer plate (13) of the rear wheel housing, characterized in that: The inner panel reinforcement structure comprises an inner panel main reinforcement structure (1) extending from the upper side to the lower side of the rear wheel housing inner panel (12) and an inner panel auxiliary reinforcement structure fixed to the inner panel main reinforcement structure (1), wherein the inner panel auxiliary reinforcement structure comprises a first inner panel auxiliary reinforcement plate for transmitting the load on the rear wheel housing to the D-pillar and a second inner panel auxiliary reinforcement plate for reducing the deformation of the rear wheel housing caused by the excitation of the rear shock absorber; The outer panel reinforcement structure includes an outer panel main reinforcement structure (10) extending from the upper side to the lower side of the rear wheel cover outer panel (13) and an outer panel auxiliary reinforcement structure fixed to the outer panel main reinforcement structure (10), and the outer panel auxiliary reinforcement structure includes a first outer panel auxiliary reinforcement plate for transferring the load on the rear wheel cover to the C-pillar and a second outer panel auxiliary reinforcement plate for reducing the deformation of the rear wheel cover caused by the excitation of the rear shock absorber.

2. The rear wheel housing reinforcement structure according to claim 1, characterized in that: The first inner panel auxiliary reinforcement plate and the second inner panel auxiliary reinforcement plate are both cavity structures with flanges on all sides.

3. The rear wheel housing reinforcement structure according to claim 1 or 2, characterized in that: The first inner panel auxiliary reinforcement plate comprises an inner panel rear reinforcement plate (2) fixedly connected to the inner panel main reinforcement structure (1) at the front side and fixedly connected to the D-pillar installation area of ​​the rear wheel cover at the rear side.

4. The rear wheel housing reinforcement structure according to claim 3, characterized in that: The inner panel rear reinforcement plate (2) is arranged on the upper part of the rear wheel housing inner panel (12).

5. The rear wheel housing reinforcement structure according to claim 1 or 2, characterized in that: The second inner panel auxiliary reinforcement plate comprises an inner panel front reinforcement plate whose rear side is fixedly connected to the inner panel main reinforcement structure (1) and whose front side is fixedly connected to the front part of the rear wheel cover inner panel (12).

6. The rear wheel housing reinforcement structure according to claim 5, characterized in that: The inner panel front reinforcement plate comprises at least two inner panel upper front reinforcement plates (3) and inner panel lower front reinforcement plates (4) arranged up and down.

7. The rear wheel housing reinforcement structure according to claim 1, characterized in that: The first outer panel auxiliary reinforcement plate and the second outer panel auxiliary reinforcement plate are both cavity structures with flanges on all sides.

8. The rear wheel housing reinforcement structure according to claim 1 or 7, characterized in that: The first outer panel auxiliary reinforcement plate comprises an outer panel front reinforcement plate (9) whose rear side is fixedly connected to the outer panel main reinforcement structure (10) and whose front side is fixedly connected to the C-pillar mounting area of ​​the rear wheel cover.

9. The rear wheel housing reinforcement structure according to claim 1 or 7, characterized in that: The second outer panel auxiliary reinforcement plate comprises an outer panel rear reinforcement plate (11) whose front side is fixedly connected to the outer panel main reinforcement structure (10) and whose rear side is fixedly connected to the rear portion of the rear wheel housing outer panel (13).

10. A design method for a rear wheel housing reinforcement structure, characterized in that: It includes constructing a rear wheel cover simulation model, applying a load to a rear shock absorber mounting point of the rear wheel cover simulation model, confirming a structural weak point of the rear wheel cover simulation model, setting a rear wheel cover auxiliary reinforcement structure at the structural weak point of the rear wheel cover simulation model, and judging whether the rear wheel cover simulation model provided with the rear wheel cover auxiliary reinforcement structure meets the structural strength requirement when subjected to the rear shock absorber load; if not, modifying and optimizing the rear wheel cover auxiliary reinforcement structure until the rear wheel cover simulation model provided with the rear wheel cover auxiliary reinforcement structure meets the structural strength requirement when subjected to the rear shock absorber load.

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