Rear side member, rear side member assembly, and vehicle

Abstract

The application discloses a rear longitudinal beam, a rear longitudinal beam assembly and a vehicle. The rear longitudinal beam comprises a rear longitudinal beam body, a hollow structure is arranged in the rear longitudinal beam body, a reinforcing pipe is arranged in the hollow structure, and at least one reinforcing rib is arranged between the reinforcing pipe and the rear longitudinal beam body. The reinforcing pipe and the reinforcing rib both extend along the axial direction of the rear longitudinal beam body. The application discloses a rear longitudinal beam, a rear longitudinal beam assembly and a vehicle, and solves the problem that the existing rear longitudinal beam does not provide ideal use effect.

Description

Technical Field

[0001] This application relates to the field of vehicle parts technology, and more specifically, to a rear longitudinal beam, a rear longitudinal beam assembly, and a vehicle. Background Technology

[0002] With the rapid development of the automotive industry, fuel consumption and emission requirements are becoming increasingly stringent, making new energy vehicles the guiding principle and goal of the industry. Compared to internal combustion engine vehicles, new energy vehicles have advantages such as simpler structure, fewer operating and transmission components, and less maintenance workload. When new energy vehicles use AC induction motors, the motors require no maintenance, and more importantly, new energy vehicles are easy to operate. Compared to hybrid and fuel cell vehicles, pure electric vehicles use electric motors instead of internal combustion engines, resulting in lower noise and no pollution. The space and weight saved by the electric motor, fuel, and transmission system can compensate for the battery requirements. Furthermore, because they use a single source of energy, the electronic control system is significantly simplified compared to hybrid electric vehicles, reducing costs and partially offsetting the battery price. In recent years, with the increasing proportion of new energy vehicles, electrical safety has become increasingly important, especially since many electric vehicles have their CDU (Conversion & Distribution Unit, on-board charger) components located under the rear floor of the trunk. This arrangement raises concerns about high-speed rear-end collision safety.

[0003] Traditional gasoline-powered vehicles rely primarily on the rear energy-absorbing box and the deformation of the rear section of the rear longitudinal beam to prevent fuel leaks. However, with the CDU (Continuous Energy Dissipation Unit) located under the rear floor of the trunk, during a collision, the rear longitudinal beam deforms after being impacted by obstacle avoidance. The tailgate and rear panel, also impacted by obstacle avoidance, are pushed forward and pressed against the CDU. Because the CDU is a high-voltage component, there is a significant electrical safety risk. Therefore, the existing rear longitudinal beam cannot meet the requirement of minimizing deformation in high-speed rear-end collisions of new energy vehicles.

[0004] Therefore, a rear longitudinal beam, a rear longitudinal beam assembly, and a vehicle are needed to solve the above problems. Utility Model Content

[0005] In view of this, the purpose of this application is to provide a rear longitudinal beam, a rear longitudinal beam assembly, and a vehicle to solve the problem that the existing rear longitudinal beams do not provide satisfactory performance.

[0006] For the purposes described above, this application provides a rear longitudinal beam, comprising:

[0007] The rear longitudinal beam body has a hollow structure inside, a reinforcing tube inside the hollow structure, and at least one reinforcing rib between the reinforcing tube and the rear longitudinal beam body; both the reinforcing tube and the reinforcing rib extend along the axial direction of the rear longitudinal beam body.

[0008] Optionally, there are multiple reinforcing ribs, which are evenly distributed along the reinforcing tube.

[0009] Optionally, the reinforcing tube is centrally located within the hollow structure, and at least one reinforcing rib is located at the point where the distance between the reinforcing tube and the rear longitudinal beam body is minimized.

[0010] Optionally, the rear longitudinal beam body includes a top plate, a bottom plate, and at least two side plates. The top plate and the bottom plate are opposite to each other and spaced apart. The same end of the top plate and the bottom plate is connected by at least one of the side plates. The top plate, the bottom plate, and the side plates enclose a beam structure with the hollow structure.

[0011] Optionally, the reinforcing rib and the reinforcing tube may have different thicknesses; and / or the thicknesses of the various sides of the rear longitudinal beam body may be different.

[0012] This application also provides a rear longitudinal beam assembly, comprising:

[0013] The first rear longitudinal beam, as described above, is the first rear longitudinal beam;

[0014] The second rear longitudinal beam is connected to the first rear longitudinal beam, and the structural strength of the second rear longitudinal beam is higher than that of the first rear longitudinal beam.

[0015] Optionally, the first rear longitudinal beam includes a first connecting end and a second connecting end disposed opposite to each other, the second rear longitudinal beam being connected to the first connecting end; a baffle is provided on the second connecting end, and an energy-absorbing structure is provided on the baffle.

[0016] Optionally, the first connecting end is provided with a first bolt hole, and the first mating end of the second rear longitudinal beam is provided with a first mating bolt hole. The first mating end overlaps the first connecting end. The first bolt hole and the first mating bolt hole are arranged opposite to each other and a first bolt passes through them. The first bolt is used to fix the relative position of the first connecting beam and the second connecting beam; and / or

[0017] The first connecting end is provided with a second bolt hole, and the second mating end of the subframe is provided with a second mating bolt hole. The second mating end overlaps the second connecting end. The second bolt hole and the second mating bolt hole are arranged opposite to each other and a second bolt is passed through them. The second bolt is used to fix the relative position of the first connecting beam and the subframe.

[0018] Optionally, the first rear longitudinal beam is made of aluminum profile, and the second rear longitudinal beam is made of integral cast aluminum structure.

[0019] This application also provides a vehicle comprising: a rear longitudinal beam as described above, or a rear longitudinal beam assembly as described above.

[0020] As can be seen from the above, the rear longitudinal beam, rear longitudinal beam assembly, and vehicle provided in this application have the following advantages compared with the prior art: By employing the aforementioned rear longitudinal beam, and by incorporating reinforcing ribs and reinforcing tubes within the beam, the structural strength requirements can be met to the greatest extent possible, while simultaneously controlling the overall weight to achieve optimal cost-weight ratio. Furthermore, the force transmission path can be optimized, further improving the structural strength of the rear longitudinal beam. Even in high-speed rear-end collisions, the rear longitudinal beam can be guaranteed to remain undeformed, or deform only slightly but within a relatively controllable range, thereby reducing the impact of deformation on the CDU (Continuous Duty Unit) and ensuring that the CDU is not affected by, or is minimally affected by, the collision force, thus reducing electrical safety risks. Attached Figure Description

[0021] The above features and technical advantages of this application will become clearer and easier to understand from the following description of its embodiments in conjunction with the accompanying drawings.

[0022] Figure 1 This is a side view of the first rear longitudinal beam used in a specific embodiment of this application.

[0023] Figure 2 for Figure 1 The diagram shows the first rear longitudinal beam.

[0024] Figure 3 This is a schematic diagram of the rear longitudinal beam assembly used in a specific embodiment of this application.

[0025] Figure 4 for Figure 3 The side view of the rear longitudinal beam assembly shown.

[0026] The attached figures are labeled as follows:

[0027] 1. Second rear longitudinal beam; 2. First rear longitudinal beam; 21. Rear longitudinal beam body; 211. Reinforcing rib; 212. Reinforcing tube; 22. First bolt hole; 23. Second bolt hole; 3. Baffle. Detailed Implementation

[0028] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with specific embodiments and the accompanying drawings. Identical components are represented by the same reference numerals. It should be noted that the terms "front," "rear," "left," "right," "up," and "down" used in the following description refer to directions in the accompanying drawings. The terms "inner" and "outer" refer to directions toward or away from the geometric center of a specific component, respectively.

[0029] Figure 1This is a side view of the first rear longitudinal beam used in a specific embodiment of this application. Figure 2 for Figure 1 A schematic diagram of the first rear longitudinal beam is shown. (As shown) Figures 1 to 2 As shown, the rear longitudinal beam includes the rear longitudinal beam body 21.

[0030] The rear longitudinal beam body 21 has a hollow structure inside, which can be installed through the axial direction of the rear longitudinal beam body 21.

[0031] A reinforcing tube 212 is installed inside the hollow structure. The reinforcing tube 212 can be centrally or eccentrically positioned within the hollow structure, and there is an annular gap between the reinforcing tube 212 and the rear longitudinal beam body 21. The cross-section of the reinforcing tube 212 includes, but is not limited to, common shapes such as circular, elliptical, and square.

[0032] At least one reinforcing rib 211 is provided between the reinforcing tube 212 and the rear longitudinal beam body 21. The reinforcing rib 211 is located in the annular gap between the reinforcing tube 212 and the rear longitudinal beam body 21. One end of the reinforcing rib 211 is connected to the reinforcing tube 212, and the other end of the reinforcing rib 211 is connected to the rear longitudinal beam body 21. One or more reinforcing ribs 211 can be provided in this annular gap, and the number of reinforcing ribs 211 is determined according to the specific structural strength requirements. The cross-section of the reinforcing rib 211 includes, but is not limited to, common shapes such as straight lines and curves.

[0033] Both the reinforcing tube 212 and the reinforcing rib 211 extend along the axial direction of the rear longitudinal beam body 21. Typically, the extension length is set according to specific structural strength requirements. For example, both the reinforcing tube 212 and the reinforcing rib 211 can be installed continuously along the axial direction of the rear longitudinal beam body 21.

[0034] Both the reinforcing tube 212 and the reinforcing rib 211 are disposed within the hollow structure of the rear longitudinal beam body 21. Both extend axially along the rear longitudinal beam body 21, creating multiple force transmission paths on the rear longitudinal beam body 21. Force can be transmitted not only through the rear longitudinal beam body 21 but also through the reinforcing tube 212 and the reinforcing rib 211. Furthermore, the hollow structure and the reinforcing tube 212 provide space for deformation.

[0035] During assembly, one end of the rear longitudinal beam is connected to the main body of the rear longitudinal beam, and simultaneously, that end is connected to the subframe. The other end of the rear longitudinal beam is connected to the energy-absorbing structure. At least one direction (e.g., the X-axis) of the CDU mounting location coincides with the rear longitudinal beam. In a collision, the energy-absorbing structure crushes first, followed by compression of the rear longitudinal beam. Under the combined action of the reinforcing ribs 211 and reinforcing tubes 212, the rear longitudinal beam does not deform, or undergoes only minor deformation, while the main body of the rear longitudinal beam remains undeformed. The smaller the deformation of the rear longitudinal beam, the higher the safety of the CDU, thus meeting the CDU's electrical safety risk requirements.

[0036] By employing the aforementioned rear longitudinal beam, and incorporating reinforcing ribs 211 and reinforcing tubes 212 within it, the structural strength requirements can be maximized while controlling the overall weight to achieve optimal cost-weight ratio. This also optimizes the force transmission path, further enhancing the structural strength of the rear longitudinal beam. Even under high-speed rear-end collision conditions, the rear longitudinal beam can remain undeformed or deform only slightly within a controllable range, minimizing the impact of deformation on the CDU and ensuring that the CDU is minimally or completely unaffected by the collision force, thus reducing electrical safety risks.

[0037] Optionally, there may be multiple reinforcing ribs 211, which are evenly distributed along the reinforcing tube 212. Increasing the number of reinforcing ribs 211 can further improve the structural strength of the rear longitudinal beam.

[0038] In one embodiment of this application, there are three reinforcing ribs 211, which are respectively connected to the three sides of the rear longitudinal beam body 21. One reinforcing rib 211 is connected to the top surface of the rear longitudinal beam body 21, and the other two reinforcing ribs 211 are respectively connected to the opposite side walls of the rear longitudinal beam body 21. No reinforcing ribs 211 are provided on the bottom surface of the rear longitudinal beam body 21, as this surface does not face the CDU side and is used for connecting other accessories. By controlling the number of reinforcing ribs 211, the overall weight of the rear longitudinal beam can be controlled.

[0039] To further enhance structural strength and control deformation space, the reinforcing tube 212 may optionally be centrally located within the hollow structure. Both the reinforcing tube 212 and the rear longitudinal beam body 21 are typically chosen to have regular shapes, resulting in good overall structural strength and ease of fabrication.

[0040] At least one reinforcing rib 211 is provided at the point where the distance between the reinforcing tube 212 and the rear longitudinal beam body 21 is minimized. By providing the reinforcing ribs 211, the force between the reinforcing tube 212 and the rear longitudinal beam body 21 can be effectively transferred, ensuring the good overall performance of the rear longitudinal beam.

[0041] In one embodiment of this application, the rear longitudinal beam body 21 has a rectangular cross-section, and the reinforcing tube 212 is centrally located within the hollow structure, with a circular cross-section. All reinforcing ribs 211 have straight cross-sections. Therefore, there are two points where the distance between the reinforcing tube 212 and the rear longitudinal beam body 21 is minimal, with two reinforcing ribs 211 located on opposite sides of the reinforcing tube 212, both situated at the centerline of the height of the rear longitudinal beam body 21. Another reinforcing rib 211 is located at the centerline of the width of the rear longitudinal beam body 21. One side of the rear longitudinal beam body 21 is reserved without the need for reinforcing ribs 211; clearance holes can be provided on this side, avoiding increased machining costs during subframe assembly.

[0042] In one embodiment of this application, the reinforcing tube 212 is eccentrically arranged in the hollow structure. The reinforcing tube 212 is arranged on the side of the rear longitudinal beam body 21 close to the CDU, so that the structural strength of the rear longitudinal beam body 21 close to the CDU is higher. Once deformation occurs, it can preferentially move from the side with relatively lower structural strength, that is, the side of the rear longitudinal beam body 21 away from the CDU.

[0043] To meet structural strength requirements while reducing manufacturing and assembly difficulties, the rear longitudinal beam body 21 has a relatively regular shape. Optionally, the rear longitudinal beam body 21 includes a top plate, a bottom plate, and at least two side plates. The top plate and bottom plate are opposite each other and spaced apart. The same end of the top plate and bottom plate is connected by at least one side plate. The top plate, bottom plate, and side plates enclose a beam structure with a hollow structure. This beam structure can be a one-piece molded structure.

[0044] In one embodiment of this application, the rear longitudinal beam body 21 includes three reinforcing ribs 211, a reinforcing tube 212, a top plate, a bottom plate, and two side plates. The top plate and bottom plate are opposite to each other and spaced apart. The same end of the top plate and bottom plate is connected by a side plate. The top plate, bottom plate, and two side plates enclose a beam structure with a hollow structure. There are smooth transitions between the top plate and the side plates, and between the bottom plate and the side plates, to avoid stress concentration. The beam structure has four cavities: the cavity inside the reinforcing tube 212, two cavities enclosed by the reinforcing tube 212, the reinforcing ribs 211, a partial top (or bottom) plate, and a partial side plate, and a cavity enclosed by the reinforcing tube 212, the reinforcing ribs 211, the bottom (or top) plate, and the partial side plate.

[0045] To improve the applicability and flexibility of the rear longitudinal beam and meet the needs of different vehicle models, the operating conditions can be simulated using software before manufacturing the rear longitudinal beam. Based on the deformation and CDU stress during the collision process, the strength requirements at various locations of the rear longitudinal beam can be refined. Optionally, the thicknesses of the reinforcing ribs 211 and reinforcing tubes 212 can be different; and / or the thicknesses of different sides of the rear longitudinal beam body 21 can be different. For example, the thickness of the side of the rear longitudinal beam body 21 and the reinforcing ribs 211 on the side away from the CDU can be set normally, while the thickness of the side of the rear longitudinal beam body 21 and the reinforcing ribs 211 on the side closer to the CDU can be increased accordingly, thereby further strengthening the structural strength of the rear longitudinal beam while meeting the requirements for lightweighting.

[0046] In one embodiment of this application, due to factors such as the weight of different vehicle models, the position of the CDU, and the amount of rear-impact intrusion, the compressive force on the CDU varies. The weight of different vehicle models, the position of the CDU, and the amount of rear-impact intrusion are input as influencing factors into software (such as CAE) for simulation. The structural thickness of the rear longitudinal beam is analyzed, and based on the simulation analysis results, different material thickness ratios are provided for each side of the cross section 21 of the rear longitudinal beam body to produce the most suitable material thickness ratio for the rear longitudinal beam.

[0047] This application also provides a rear longitudinal beam assembly, including: a first rear longitudinal beam 2 and a second rear longitudinal beam 1.

[0048] The first rear longitudinal beam 2 can be any of the rear longitudinal beams mentioned above, and will not be described in detail here.

[0049] The second rear longitudinal beam 1 is connected to the first rear longitudinal beam 2, and the structural strength of the second rear longitudinal beam 1 is higher than that of the first rear longitudinal beam 2. The structural strength of the second rear longitudinal beam 1 can be comprehensively improved through material selection, manufacturing process, and the addition of reinforcing structures.

[0050] When the rear of the vehicle is involved in a collision, the external force travels through the first rear longitudinal beam 2 to the second rear longitudinal beam 1. By selecting materials and / or reinforcing structures, the structural strength of the second rear longitudinal beam 1 is set to be higher than that of the first rear longitudinal beam 2. During the collision, the first rear longitudinal beam 2 is compressed and deformed, while the second rear longitudinal beam 1 remains undeformed. The smaller the deformation of the first rear longitudinal beam 2 and the less deformation of the second rear longitudinal beam 1, the higher the safety of the CDU.

[0051] By employing the aforementioned rear longitudinal beam assembly, the structural strength of the first rear longitudinal beam 2 and the second rear longitudinal beam 1 is increased, thereby enhancing the overall strength of the rear longitudinal beam assembly, reducing its deformation, and improving the vehicle's crashworthiness. By setting the structural strength of the second rear longitudinal beam 1 to be higher than that of the first rear longitudinal beam 2, the deformation range is controlled at the first rear longitudinal beam 2, preventing further propagation. The use of a first rear longitudinal beam 2 with a specific cross-sectional shape further enhances the structural strength of the rear longitudinal beam assembly, reduces the impact force on the rear CDU, avoids electrical safety issues, and thus meets the CDU's electrical safety risk requirements.

[0052] Optionally, the first rear longitudinal beam 2 includes a first connecting end and a second connecting end disposed opposite to each other, and the second rear longitudinal beam 1 is connected to the first connecting end; a baffle 3 is provided on the second connecting end, and an energy-absorbing structure is provided on the baffle 3. During assembly, the first connecting end of the first rear longitudinal beam 2 is connected to the main body of the rear longitudinal beam, and at the same time, this end is connected to the subframe, and the second connecting end of the first rear longitudinal beam 2 is connected to the energy-absorbing structure. In a collision, the energy-absorbing structure is crushed first, and then the first rear longitudinal beam 2 is compressed. Under the combined action of the reinforcing rib 211 and the reinforcing tube 212, it does not deform or undergoes only slight deformation to meet the CDU electrical safety risk requirements.

[0053] In one embodiment of this application, the energy-absorbing structure includes, but is not limited to, an energy-absorbing box. The energy-absorbing box is installed on the surface of the baffle 3 facing away from the first rear longitudinal beam 2, and the baffle 3 abuts against the end face of the first rear longitudinal beam 2.

[0054] To achieve rapid assembly, the first rear longitudinal beam 2 and the second rear longitudinal beam 1, as well as the first rear longitudinal beam 2 and the subframe, are detachably connected. For example, both the first and second connecting ends are threaded connections. Optionally, the first connecting end is provided with a first bolt hole 22, and the first mating end of the second rear longitudinal beam 1 is provided with a first mating bolt hole. The first mating end overlaps the first connecting end, with the first bolt hole 22 and the first mating bolt hole facing each other and a first bolt passing through them. The first bolt is used to fix the relative position of the first connecting beam and the second connecting beam. Two first bolt holes 22 are provided on each of the opposite side plates of the first connecting end. The first mating end overlaps the first connecting end, and a first mating bolt hole is provided at the corresponding position of the first mating end. Then, the first bolt passes through the opposite first bolt hole 22 and the first mating bolt hole to achieve relative fixation of the first connecting end and the first mating end, thereby realizing the connection between the first rear longitudinal beam 2 and the second rear longitudinal beam 1.

[0055] The first connecting end is provided with a second bolt hole 23, and the second mating end of the subframe is provided with a second mating bolt hole. The second mating end overlaps the second connecting end. The second bolt hole 23 and the second mating bolt hole are arranged opposite each other, and a second bolt passes through them. The second bolt is used to fix the relative position of the first connecting beam and the subframe. The top plate of the second connecting end is provided with two second bolt holes 23, and the end face of the top plate of the second connecting end is provided with an opening. The second mating end overlaps the second connecting end, and the corresponding position of the second mating end is provided with a second mating bolt hole. Then, by using the second bolt to pass through the opposite second bolt hole 23 and the second mating bolt hole, the relative fixation of the second connecting end and the second mating end is achieved, thereby realizing the connection between the first rear longitudinal beam 2 and the subframe.

[0056] To improve connection strength, the first rear longitudinal beam 2 can optionally be made of aluminum profile and welded to the baffle 3. To improve the structural strength of the second rear longitudinal beam 1, the second rear longitudinal beam 1 adopts an integral cast aluminum structure and is equipped with a reinforcing structure, making the structural strength of the second rear longitudinal beam 1 higher than that of the first rear longitudinal beam 2. Using different materials to manufacture the rear longitudinal beam assembly can both meet the structural strength requirements and achieve weight reduction.

[0057] This application also provides a vehicle, the vehicle including: a rear longitudinal beam as described above, or a rear longitudinal beam assembly as described above.

[0058] As can be seen from the above description and practice, the rear longitudinal beam, rear longitudinal beam assembly, and vehicle provided in this application have the following advantages compared with the prior art: By using the aforementioned rear longitudinal beam, and with reinforcing ribs and reinforcing tubes working together within the beam, the structural strength requirements can be met to the greatest extent possible, while controlling the overall weight as much as possible to achieve optimal cost-weight ratio. Simultaneously, the force transmission path can be optimized, further improving the structural strength of the rear longitudinal beam. Even in high-speed rear-end collisions, the rear longitudinal beam can be guaranteed to remain undeformed, or deform only slightly but within a relatively controllable range, thereby reducing the impact of deformation on the CDU (Continuous Duty Unit) and ensuring that the CDU is not affected by or is minimally affected by the collision force, thus reducing electrical safety risks.

[0059] Those skilled in the art should understand that the above description is merely a specific embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, improvements, etc., made within the scope of this application should be included within the protection scope of this application.

Claims

1. A rear longitudinal beam, characterized in that, include: The rear longitudinal beam body has a hollow structure inside, a reinforcing tube inside the hollow structure, and at least one reinforcing rib between the reinforcing tube and the rear longitudinal beam body; both the reinforcing tube and the reinforcing rib extend along the axial direction of the rear longitudinal beam body.

2. The rear longitudinal beam according to claim 1, characterized in that: The number of reinforcing ribs is multiple, and the multiple reinforcing ribs are evenly distributed along the reinforcing tube.

3. The rear longitudinal beam according to claim 2, characterized in that: The reinforcing tube is centrally located within the hollow structure, and at least one reinforcing rib is located at the point where the distance between the reinforcing tube and the rear longitudinal beam body is minimized.

4. The rear longitudinal beam according to any one of claims 1 to 3, characterized in that: The rear longitudinal beam body includes a top plate, a bottom plate, and at least two side plates. The top plate and the bottom plate are opposite to each other and spaced apart. The same end of the top plate and the bottom plate is connected by at least one of the side plates. The top plate, the bottom plate, and the side plates enclose and form a beam structure with the hollow structure.

5. The rear longitudinal beam according to any one of claims 1 to 3, characterized in that: The thicknesses of the reinforcing ribs and the reinforcing tubes are different; and / or the thicknesses of the various sides of the rear longitudinal beam body are different.

6. A rear longitudinal beam assembly: characterized in that, include: The first rear longitudinal beam is the rear longitudinal beam as described in any one of claims 1 to 5; The second rear longitudinal beam is connected to the first rear longitudinal beam, and the structural strength of the second rear longitudinal beam is higher than that of the first rear longitudinal beam.

7. The rear longitudinal beam assembly according to claim 6, characterized in that: The first rear longitudinal beam includes a first connecting end and a second connecting end arranged opposite to each other, and the second rear longitudinal beam is connected to the first connecting end; a baffle is provided on the second connecting end, and an energy-absorbing structure is provided on the baffle.

8. The rear longitudinal beam assembly according to claim 7, characterized in that: The first connecting end is provided with a first bolt hole, and the first mating end of the second rear longitudinal beam is provided with a first mating bolt hole. The first mating end overlaps the first connecting end. The first bolt hole and the first mating bolt hole are arranged opposite to each other, and a first bolt passes through them. The first bolt is used to fix the relative position of the first connecting beam and the second connecting beam; and / or The first connecting end is provided with a second bolt hole, and the second mating end of the subframe is provided with a second mating bolt hole. The second mating end overlaps the second connecting end. The second bolt hole and the second mating bolt hole are arranged opposite to each other and a second bolt is passed through them. The second bolt is used to fix the relative position of the first connecting beam and the subframe.

9. The rear longitudinal beam assembly according to claim 6, characterized in that: The first rear longitudinal beam is made of aluminum profile, and the second rear longitudinal beam is made of one-piece cast aluminum structure.

10. A vehicle, characterized in that, The vehicle includes: a rear longitudinal beam as described in any one of claims 1 to 5, or a rear longitudinal beam assembly as described in any one of claims 6 to 9.

Images