Lower vehicle body structure, chassis and vehicle

Abstract

The utility model provides a lower vehicle body structure, a chassis and a vehicle, which comprise a front anti-collision beam, energy absorption components, a front anti-collision beam connecting component, a front longitudinal beam assembly, a front wall connecting mechanism, a threshold beam assembly, a rear wall connecting mechanism, a rear floor frame assembly, a rear anti-collision beam connecting component and a rear anti-collision beam, the front anti-collision beam connecting assembly is connected with the energy absorption assembly, the front longitudinal beam assembly comprises a first front longitudinal beam and a second front longitudinal beam, the doorsill beam assembly comprises a first inner doorsill beam, a second inner doorsill beam, a first outer doorsill beam and a second outer doorsill beam, and the rear floor frame assembly comprises a first rear longitudinal beam, a second rear longitudinal beam, a first rear cross beam and a second rear cross beam. The left side and the right side of the rear anti-collision beam are connected with the rear anti-collision beam connecting assemblies. According to the utility model, energy can be better absorbed and dispersed during collision, the stability is high, the usage amount of materials and the manufacturing complexity are reduced, and the manufacturing cost of the vehicle body structure is reduced.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of automobile, specifically discloses a lower car body structure, chassis and vehicle. BACKGROUND

[0002] In modern automobile industry, the safety performance of vehicle is one of the focuses of consumers and manufacturers. As an important part of vehicle safety performance, the design and material selection of car body structure directly affect the performance of vehicle in collision. Traditional car body structure mostly uses single material, such as steel, which has high strength and rigidity, but has deficiencies in weight and cost. With the development of material science, new materials such as high-strength steel, aluminum alloy and composite material are introduced into car body structure to improve the safety performance and economy of vehicle. However, even if new materials are used, the design of car body structure still faces challenges. How to reduce the weight of vehicle, reduce cost and improve manufacturing efficiency while ensuring safety performance is a key problem in the design of car body structure. In addition, the energy absorption and dispersion capacity of car body structure under different collision conditions also need to be considered to protect passengers from injury. In the design of car body structure, the design of key components such as front crash beam, longitudinal beam, door sill beam and rear crash beam is particularly important. These components not only need to have enough strength to resist collision, but also need to have good energy absorption characteristics to reduce the impact of collision on passengers. Traditional design often ignores the synergy between these components, resulting in unsatisfactory performance of vehicle in actual collision.

[0003] To solve the above problems, the utility model provides a lower car body structure, chassis and vehicle, which optimizes the design of front crash beam, energy absorption assembly, longitudinal beam and other components, realizes the lightweight of car body structure, and improves the strength and energy absorption performance of car body structure. The lower car body structure of the utility model effectively improves the overall performance of car body structure through the hollow profile front crash beam and rear crash beam which are curved outward in the middle, and the optimized energy absorption assembly and connecting mechanism. SUMMARY

[0004] The utility model discloses a lower car body structure, chassis and vehicle to solve the problems of heavy weight, high cost, low strength, poor energy absorption effect and low stability of the existing lower car body structure.

[0005] The utility model provides a lower car body structure, which comprises

[0006] The front crash beam is a hollow profile curved outward in the middle.

[0007] The energy absorption assembly is arranged on the left and right sides of the front crash beam.

[0008] The front crash beam connecting assembly is connected with the energy absorption assembly.

[0009] a front longitudinal beam assembly, the front longitudinal beam assembly comprising a first front longitudinal beam and a second front longitudinal beam, one end of the first front longitudinal beam and the second front longitudinal beam being connected with the front bumper beam connecting assembly;

[0010] a front wall connecting mechanism, the front wall connecting mechanism being connected with the other end of the first front longitudinal beam and the second front longitudinal beam, respectively;

[0011] a rocker beam assembly, the rocker beam assembly comprising a first inner rocker beam, a second inner rocker beam, a first outer rocker beam and a second outer rocker beam, one end of the first inner rocker beam being connected with the front wall connecting mechanism, the first outer rocker beam being arranged outside the first inner rocker beam, one end of the second inner rocker beam being connected with the front wall connecting mechanism, the second outer rocker beam being arranged outside the second inner rocker beam;

[0012] a rear wall connecting mechanism, the rear wall connecting mechanism being connected with the other end of the first inner rocker beam and the second inner rocker beam;

[0013] a rear floor frame assembly, the rear floor frame assembly comprising a first rear longitudinal beam, a second rear longitudinal beam, a first rear cross beam and a second rear cross beam, one end of the first rear longitudinal beam and the second rear longitudinal beam being connected with the rear wall connecting mechanism, the first rear cross beam being connected with the rear wall connecting mechanism, and the left and right ends of the first rear cross beam being connected with the first rear floor connecting beam and the second rear floor connecting beam, respectively, one end of the second rear cross beam being connected with the first rear longitudinal beam, and the other end of the second rear cross beam being connected with the second rear longitudinal beam;

[0014] a rear bumper beam connecting assembly, the other end of the first rear longitudinal beam and the second rear longitudinal beam being connected with the rear bumper beam connecting assembly;

[0015] a rear bumper beam, the rear bumper beam being a hollow profile with a curved middle part, the left and right sides of the rear bumper beam being connected with the rear bumper beam connecting assembly.

[0016] According to some embodiments of the present application, an underbody structure, the energy absorption assembly comprises a first energy absorption column, a second energy absorption column, a third energy absorption column and a fourth energy absorption column, the first energy absorption column, the second energy absorption column, the third energy absorption column and the fourth energy absorption column are all square tube structures with reinforcing ribs inside, one end of the first energy absorption column and one end of the second energy absorption column are connected with the left side of the front bumper beam, respectively, one end of the third energy absorption column and one end of the fourth energy absorption column are connected with the right side of the front bumper beam, respectively;

[0017] The first, second, third, and fourth energy-absorbing columns are all made of aluminum alloy extruded profiles and are produced by extrusion. The first, second, third, and fourth energy-absorbing columns are welded to the front anti-collision beam, and the third and fourth energy-absorbing columns are welded to the connecting plate of the second front anti-collision beam.

[0018] According to some embodiments of this application, in a vehicle body structure, the front anti-collision beam connecting assembly includes a first front anti-collision beam connecting plate, a first front longitudinal beam connecting plate, a second front anti-collision beam connecting plate, and a second front longitudinal beam connecting plate. The first front anti-collision beam connecting plate is welded to the other end of the first energy-absorbing column and the other end of the second energy-absorbing column. The first front anti-collision beam connecting plate is bolted to the first front longitudinal beam connecting plate. The first front longitudinal beam connecting plate is welded to the first front longitudinal beam. The second front anti-collision beam connecting plate is welded to the other end of the third energy-absorbing column and the other end of the fourth energy-absorbing column. The second front anti-collision beam connecting plate is bolted to the second front longitudinal beam connecting plate. The second front longitudinal beam connecting plate is welded to the second front longitudinal beam.

[0019] According to some embodiments of this application, a lower body structure includes a front connecting mechanism comprising a first front floor connecting beam, a second front floor connecting beam, and a front lower crossbeam. The first front floor connecting beam and the second front floor connecting beam are both bent hollow profiles and are symmetrically arranged at the left and right ends of the front lower crossbeam. The front lower crossbeam is a hollow profile. The other end of the first front longitudinal beam is welded to one side of the first front floor connecting beam. The first inner sill beam is welded to the other side of the first front floor connecting beam. The other end of the second front longitudinal beam is welded to one side of the second front floor connecting beam. The second inner sill beam is welded to the other side of the second front floor connecting beam.

[0020] The lower front crossbeam, the first front floor connecting beam, and the second front floor connecting beam are equipped with reinforcing ribs. The lower front crossbeam, the first front floor connecting beam, and the second front floor connecting beam are all made of aluminum alloy extruded profiles and are all manufactured by extrusion. The first front floor connecting beam and the second front floor connecting beam are connected to the lower front crossbeam by welding.

[0021] According to some embodiments of this application, in a lower body structure, the rear connecting mechanism includes a first rear floor connecting beam, a second rear floor connecting beam, and a rear lower crossbeam. The first rear floor connecting beam and the second rear floor connecting beam are both bent hollow profiles and are symmetrically arranged at the left and right ends of the rear lower crossbeam. The rear lower crossbeam is a hollow profile. The other end of the first inner sill beam is welded to one side of the first rear floor connecting beam. One end of the first rear longitudinal beam is welded to the other side of the first rear floor connecting beam. The other end of the second inner sill beam is welded to one side of the second rear floor connecting beam. One end of the second rear longitudinal beam is welded to the other side of the second rear floor connecting beam.

[0022] The lower rear crossbeam, the first rear floor connecting beam, and the second rear floor connecting beam are all square tubes with internal reinforcing ribs. The lower rear crossbeam, the first rear floor connecting beam, and the second rear floor connecting beam are all aluminum alloy extruded profiles, all manufactured by extrusion. The first rear floor connecting beam and the second rear floor connecting beam are connected to the lower rear crossbeam by welding.

[0023] According to some embodiments of this application, in a vehicle body structure, the rear anti-collision beam connecting assembly includes a first rear anti-collision beam connecting plate, a first rear longitudinal beam connecting plate, a second rear anti-collision beam connecting plate, and a second rear longitudinal beam connecting plate. The first rear longitudinal beam connecting plate is welded to the other end of the first rear longitudinal beam, and the first rear longitudinal beam connecting plate is bolted to the first rear anti-collision beam connecting plate. The first rear anti-collision beam connecting plate is welded to one side of the rear anti-collision beam. The other end of the second rear longitudinal beam is welded to the second rear longitudinal beam connecting plate, and the second rear longitudinal beam connecting plate is bolted to the second rear anti-collision beam connecting plate. The second rear anti-collision beam connecting plate is welded to the other side of the rear anti-collision beam.

[0024] According to some embodiments of this application, in a vehicle body structure, the first front longitudinal beam is provided with a first shock absorber tower, and the second front longitudinal beam is provided with a second shock absorber tower. The first shock absorber tower includes a first shock absorber tower connecting plate and a first shock absorber tower cover plate that are connected to each other. The first shock absorber tower connecting plate is welded to the first front longitudinal beam. The second shock absorber tower includes a second shock absorber tower connecting plate and a second shock absorber tower cover plate that are connected to each other. The second shock absorber tower connecting plate is welded to the second front longitudinal beam.

[0025] The first shock absorber tower connecting plate and the first shock absorber tower cover plate are connected by welding, and the second shock absorber tower connecting plate and the second shock absorber tower cover plate are connected by welding.

[0026] The first rear longitudinal beam is provided with a first rear wheel cover, and the second rear longitudinal beam is provided with a second rear wheel cover. The first rear wheel cover includes a first rear wheel cover connecting plate, a second rear wheel cover connecting plate, and a first rear wheel cover cover plate. The upper ends of the first rear wheel cover connecting plate and the second rear wheel cover connecting plate are respectively welded to the left and right ends of the first rear wheel cover cover plate. The lower ends of the first rear wheel cover connecting plate and the second rear wheel cover connecting plate are respectively welded to the first rear longitudinal beam. The second rear wheel cover includes a third rear wheel cover connecting plate, a fourth rear wheel cover connecting plate, and a second rear wheel cover cover plate. The upper ends of the third rear wheel cover connecting plate and the fourth rear wheel cover connecting plate are respectively welded to the left and right ends of the second rear wheel cover cover plate. The lower ends of the third rear wheel cover connecting plate and the fourth rear wheel cover connecting plate are respectively welded to the second rear longitudinal beam.

[0027] A first rear subframe rear mounting beam is provided below the first rear longitudinal beam, and a second rear subframe rear mounting beam is provided below the second rear longitudinal beam.

[0028] According to some embodiments of this application, in a vehicle body structure, the front anti-collision beam is provided with reinforcing ribs, and the front anti-collision beam is an aluminum alloy extruded profile, which is manufactured by extrusion.

[0029] Both the first and second front longitudinal beams are square tube structures with internal reinforcing ribs. Both the first and second front longitudinal beams are aluminum alloy extruded profiles and are made by extrusion.

[0030] The first inner sill beam, the second inner sill beam, the first outer sill beam, and the second outer sill beam are all square tube structures with internal reinforcing ribs. The first inner sill beam, the second inner sill beam, the first outer sill beam, and the second outer sill beam are all aluminum alloy extruded profiles, all manufactured by extrusion. The first inner sill beam is welded to the first front floor connecting beam and the first rear floor connecting beam. The first outer sill beam is welded to the first inner sill beam. The second inner sill beam is welded to the second front floor connecting beam and the second rear floor connecting beam. The second outer sill beam is welded to the second inner sill beam.

[0031] The first rear longitudinal beam, the second rear longitudinal beam, the first rear cross beam, and the second rear cross beam are all square tubes with internal reinforcing ribs. The first rear longitudinal beam, the second rear longitudinal beam, the first rear cross beam, and the second rear cross beam are all aluminum alloy extruded profiles, all made by extrusion. The first rear longitudinal beam, the second rear longitudinal beam, the first rear cross beam, and the second rear cross beam are all connected by welding.

[0032] The rear bumper beam has internal reinforcing ribs and is made of extruded aluminum alloy profile.

[0033] This utility model also provides a chassis, which includes the aforementioned undercarriage structure.

[0034] This utility model provides a vehicle, which includes the chassis described above.

[0035] This invention proposes a lower body structure, chassis, and vehicle. Through a hollow profile design with outward bending at the center, the front and rear bumper beams can better absorb and disperse energy during a collision, reducing injury to passengers. The design of the front and rear longitudinal beam assemblies enhances the longitudinal strength of the vehicle structure, improving vehicle stability in frontal and rear collisions. Energy-absorbing components are placed on both sides of the front bumper beam to effectively absorb collision energy and reduce damage to the vehicle structure. Simultaneously, the hollow profile design reduces the weight of the vehicle structure, improves efficiency and dynamic performance, reduces material usage and manufacturing complexity, and lowers manufacturing costs. Furthermore, the design of the front and rear connecting mechanisms of the lower body structure simplifies the assembly process and improves manufacturing efficiency. The design of the sill beam assembly and rear floor frame assembly enhances the lateral strength and durability of the vehicle structure, extending the vehicle's service life. The design of the lower body structure of this utility model not only improves vehicle safety performance, but also takes into account lightweighting, cost control and manufacturing efficiency, providing a high-efficiency, economical and safe solution for the modern automotive industry. Attached Figure Description

[0036] Figure 1 This is a three-dimensional structural diagram of a lower body structure according to an embodiment of the present utility model;

[0037] Figure 2 This is a three-dimensional structural diagram of the first front anti-collision beam connecting plate in an embodiment of this utility model;

[0038] Figure 3 This is a three-dimensional structural diagram of the connecting plate of the second front anti-collision beam in an embodiment of this utility model;

[0039] Figure 4 This is a three-dimensional structural diagram of the connecting plate of the first rear anti-collision beam in an embodiment of this utility model;

[0040] Figure 5 This is a three-dimensional structural diagram of the connecting plate of the second rear anti-collision beam in an embodiment of this utility model;

[0041] Figure 6 This is a three-dimensional structural diagram of the first rear wheel cover according to an embodiment of the present utility model;

[0042] Figure 7 This is a three-dimensional structural diagram of the second rear wheel cover according to an embodiment of the present utility model.

[0043] In the diagram, 1. Front bumper beam, 2. First energy-absorbing pillar, 3. Second energy-absorbing pillar, 4. Third energy-absorbing pillar, 5. Fourth energy-absorbing pillar, 6. First front bumper beam connecting plate, 7. First front longitudinal beam connecting plate, 8. Second front bumper beam connecting plate, 9. Second front longitudinal beam connecting plate, 10. First front longitudinal beam, 11. Second front longitudinal beam, 12. Lower front crossbeam, 13. First front floor connecting beam, 14. Second front floor connecting beam, 15. First inner sill beam, 16. Second inner sill beam, 17. First outer sill beam, 18. Second outer sill beam, 19. Lower rear crossbeam, 20. First rear floor connecting beam, 21. Second rear floor connecting beam, 22. First rear longitudinal beam, 23. 24. First rear crossbeam, 25. Second rear crossbeam, 26. Rear bumper beam, 27. First rear bumper beam connecting plate, 28. First rear longitudinal beam connecting plate, 29. Second rear bumper beam connecting plate, 30. Second rear longitudinal beam connecting plate, 31. First shock absorber tower connecting plate, 32. First shock absorber tower cover plate, 33. Second shock absorber tower connecting plate, 34. Second shock absorber tower cover plate, 35. First rear wheel arch connecting plate, 36. Second rear wheel arch connecting plate, 37. First rear wheel arch cover plate, 38. Third rear wheel arch connecting plate, 39. Fourth rear wheel arch connecting plate, 40. Second rear wheel arch cover plate, 41. First rear subframe rear mounting beam, 42. Second rear subframe rear mounting beam. Detailed Implementation

[0044] The embodiments of this utility model will be described in further detail below with reference to the accompanying drawings and examples. The following examples are for illustrative purposes only and should not be construed as limiting the scope of this utility model.

[0045] In the description of this utility model, it should be noted that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this utility model. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. In the description of this utility model, it should be noted that unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances. Furthermore, in the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0046] This embodiment provides a lower body structure, such as Figure 1As shown, the system includes a front bumper beam 1, an energy-absorbing component, a front bumper beam connecting component, a front longitudinal beam assembly, a front bulkhead connecting mechanism, a sill beam assembly, a rear bulkhead connecting mechanism, a rear floor frame assembly, a rear bumper beam connecting component, and a rear bumper beam 26. The front bumper beam 1 is a hollow profile that curves outward from the center. The energy-absorbing component is located on both sides of the front bumper beam 1. The front bumper beam connecting component is connected to the energy-absorbing component. The front longitudinal beam assembly includes a first front longitudinal beam 10 and a second front longitudinal beam 11. One end of both the first front longitudinal beam 10 and the second front longitudinal beam 11 is connected to the front bumper beam connecting component. The front bulkhead connecting mechanism is connected to the other ends of the first front longitudinal beam 10 and the second front longitudinal beam 11, respectively. The sill beam assembly includes a first inner sill beam 15, a second inner sill beam 16, a first outer sill beam 17, and a second outer sill beam 18. One end of the first inner sill beam 15 is connected to the front bulkhead connecting mechanism. The first outer sill beam 17 is located outside the first inner sill beam 15. The second inner sill beam 16... One end is connected to the front sill connection mechanism. The second outer sill beam 18 is located outside the second inner sill beam 16. The rear sill connection mechanism is connected to the other end of the first inner sill beam 15 and the second inner sill beam 16. The rear floor frame assembly includes a first rear longitudinal beam 22, a second rear longitudinal beam 23, a first rear transverse beam 24 and a second rear transverse beam 25. One end of the first rear longitudinal beam 22 and the second rear longitudinal beam 23 are connected to the rear sill connection mechanism. The first rear transverse beam 24 is connected to the rear sill connection mechanism. The left and right ends of the first rear transverse beam 24 are connected to the first rear floor connecting beam 20 and the second rear floor connecting beam 21, respectively. One end of the second rear transverse beam 25 is connected to the first rear longitudinal beam 22. The other end of the second rear transverse beam 25 is connected to the second rear longitudinal beam 23. The other ends of the first rear longitudinal beam 22 and the second rear longitudinal beam 23 are connected to the rear anti-collision beam connection assembly. The rear anti-collision beam 26 is a hollow profile that bends outward in the middle. The left and right sides of the rear anti-collision beam 26 are connected to the rear anti-collision beam connection assembly.

[0047] Furthermore, as a preferred embodiment, the energy-absorbing component specifically includes a first energy-absorbing column 2, a second energy-absorbing column 3, a third energy-absorbing column 4, and a fourth energy-absorbing column 5. The first energy-absorbing column 2, the second energy-absorbing column 3, the third energy-absorbing column 4, and the fourth energy-absorbing column 5 are all square tube structures with internal reinforcing ribs. One end of the first energy-absorbing column 2 and one end of the second energy-absorbing column 3 are respectively connected to the left side of the front anti-collision beam 1, and one end of the third energy-absorbing column 4 and one end of the fourth energy-absorbing column 5 are respectively connected to the right side of the front anti-collision beam 1. The first energy-absorbing column 2, the second energy-absorbing column 3, the third energy-absorbing column 4, and the fourth energy-absorbing column 5 are all aluminum alloy extruded profiles, all manufactured by extrusion. The first energy-absorbing column 2, the second energy-absorbing column 3, the third energy-absorbing column 4, and the fourth energy-absorbing column 5 are connected to the front anti-collision beam 1 by welding, and the third energy-absorbing column 4 and the fourth energy-absorbing column 5 are connected to the second front anti-collision beam connecting plate 8 by welding.

[0048] Furthermore, as a preferred embodiment, the front bumper beam connecting assembly specifically includes a first front bumper beam connecting plate 6, a first front longitudinal beam connecting plate 7, a second front bumper beam connecting plate 8, and a second front longitudinal beam connecting plate 9, such as... Figure 2 As shown, the first front bumper beam connecting plate 6 is welded to the other end of the first energy-absorbing column 2 and the other end of the second energy-absorbing column 3; the first front bumper beam connecting plate 6 is bolted to the first front longitudinal beam connecting plate 7; and the first front longitudinal beam connecting plate 7 is welded to the first front longitudinal beam 10. Figure 3 As shown, the second front anti-collision beam connecting plate 8 is connected to the other end of the third energy-absorbing column 4 and the other end of the fourth energy-absorbing column 5 by welding. The second front anti-collision beam connecting plate 8 is connected to the second front longitudinal beam connecting plate 9 by bolts. The second front longitudinal beam connecting plate 9 is connected to the second front longitudinal beam 11 by welding.

[0049] Furthermore, as a preferred embodiment, the front panel connecting mechanism specifically includes a first front floor connecting beam 13, a second front floor connecting beam 14, and a front lower crossbeam 12. Both the first front floor connecting beam 13 and the second front floor connecting beam 14 are bent hollow profiles, symmetrically arranged at the left and right ends of the front lower crossbeam 12. The front lower crossbeam 12 is a hollow profile. The other end of the first front longitudinal beam 10 is welded to one side of the first front floor connecting beam 13. The first inner sill beam 15 is welded to the other side of the first front floor connecting beam 13. The other end of the second front longitudinal beam 11 is welded to one side of the second front floor connecting beam 14, and the second inner sill beam 16 is welded to the other side of the second front floor connecting beam 14; the front lower crossbeam 12, the first front floor connecting beam 13, and the second front floor connecting beam 14 are provided with reinforcing ribs. The front lower crossbeam 12, the first front floor connecting beam 13, and the second front floor connecting beam 14 are all aluminum alloy extruded profiles, all made by extrusion. The first front floor connecting beam 13 and the second front floor connecting beam 14 are welded to the front lower crossbeam 12.

[0050] Furthermore, as a preferred embodiment, the rear enclosure connecting mechanism specifically includes a first rear floor connecting beam 20, a second rear floor connecting beam 21, and a rear lower crossbeam 19. Both the first and second rear floor connecting beams 20 and 21 are bent hollow profiles, symmetrically arranged at the left and right ends of the rear lower crossbeam 19. The rear lower crossbeam 19 is a hollow profile. The other end of the first inner sill beam 15 is welded to one side of the first rear floor connecting beam 20, and one end of the first rear longitudinal beam 22 is welded to the other side of the first rear floor connecting beam 20. The second inner sill... The other end of beam 16 is welded to one side of the second rear floor connecting beam 21, and one end of the second rear longitudinal beam 23 is welded to the other side of the second rear floor connecting beam 21. The rear lower crossbeam 19, the first rear floor connecting beam 20, and the second rear floor connecting beam 21 are all square tubes with internal reinforcing ribs. The rear lower crossbeam 19, the first rear floor connecting beam 20, and the second rear floor connecting beam 21 are all aluminum alloy extruded profiles, all made by extrusion. The first rear floor connecting beam 20 and the second rear floor connecting beam 21 are welded to the rear lower crossbeam 19.

[0051] Furthermore, as a preferred embodiment, the rear bumper beam connecting assembly specifically includes a first rear bumper beam connecting plate 27, a first rear longitudinal beam connecting plate 28, a second rear bumper beam connecting plate 29, and a second rear longitudinal beam connecting plate 30, as shown below. Figure 4 As shown, the first rear longitudinal beam connecting plate 28 is welded to the other end of the first rear longitudinal beam 22, the first rear longitudinal beam connecting plate 28 is bolted to the first rear anti-collision beam connecting plate 27, and the first rear anti-collision beam connecting plate 27 is welded to one side of the rear anti-collision beam 26, as shown. Figure 5 As shown, the other end of the second rear longitudinal beam 23 is connected to the second rear longitudinal beam connecting plate 30 by welding, the second rear longitudinal beam connecting plate 30 is connected to the second rear anti-collision beam connecting plate 29 by bolts, and the second rear anti-collision beam connecting plate 29 is connected to the other side of the rear anti-collision beam 26 by welding.

[0052] Furthermore, as a preferred embodiment, the first front longitudinal beam 10 is provided with a first damping tower, and the second front longitudinal beam 11 is provided with a second damping tower. The first damping tower includes a first damping tower connecting plate 31 and a first damping tower cover plate 32 connected to each other. The first damping tower connecting plate 31 is welded to the first front longitudinal beam 10. The second damping tower includes a second damping tower connecting plate 33 and a second damping tower cover plate 34 connected to each other. The second damping tower connecting plate 33 is welded to the second front longitudinal beam 11. The first damping tower connecting plate 31 and the first damping tower cover plate 32 are welded together, and the second damping tower connecting plate 33 and the second damping tower cover plate 34 are welded together.

[0053] The first rear longitudinal beam 22 is provided with a first rear wheel cover, and the second rear longitudinal beam 23 is provided with a second rear wheel cover, such as Figure 6As shown, the first rear wheel arch includes a first rear wheel arch connecting plate 35, a second rear wheel arch connecting plate 36, and a first rear wheel arch cover plate 37. The upper ends of the first rear wheel arch connecting plate 35 and the second rear wheel arch connecting plate 36 are welded to the left and right ends of the first rear wheel arch cover plate 37, respectively. The lower ends of the first rear wheel arch connecting plate 35 and the second rear wheel arch connecting plate 36 are welded to the first rear longitudinal beam 22, as shown. Figure 7 As shown, the second rear wheel arch includes a third rear wheel arch connecting plate 38, a fourth rear wheel arch connecting plate 39, and a second rear wheel arch cover plate 40. The upper ends of the third rear wheel arch connecting plate 38 and the fourth rear wheel arch connecting plate 39 are welded to the left and right ends of the second rear wheel arch cover plate 40, respectively. The lower ends of the third rear wheel arch connecting plate 38 and the fourth rear wheel arch connecting plate 39 are welded to the second rear longitudinal beam 23. A first rear subframe rear mounting beam 41 is provided below the first rear longitudinal beam 22, and a second rear subframe rear mounting beam 42 is provided below the second rear longitudinal beam 23.

[0054] Furthermore, as a preferred embodiment, specifically, the front bumper beam 1 has internal reinforcing ribs, and the front bumper beam 1 is made of extruded aluminum alloy profiles, manufactured by extrusion; the first front longitudinal beam 10 and the second front longitudinal beam 11 are both square tube structures with internal reinforcing ribs, and are both made of extruded aluminum alloy profiles, manufactured by extrusion; the first inner sill beam 15, the second inner sill beam 16, the first outer sill beam 17, and the second outer sill beam 18 are all square tube structures with internal reinforcing ribs, and are both made of extruded aluminum alloy profiles, manufactured by extrusion; the first inner sill beam 15 is connected to the first front floor connecting beam 13 and the first rear floor connecting beam 20 by welding. An outer sill beam 17 is welded to a first inner sill beam 15; a second inner sill beam 16 is welded to a second front floor connecting beam 14 and a second rear floor connecting beam 21; a second outer sill beam 18 is welded to a second inner sill beam 16; a first rear longitudinal beam 22, a second rear longitudinal beam 23, a first rear transverse beam 24, and a second rear transverse beam 25 are all square tubular materials with internal reinforcing ribs; a first rear longitudinal beam 22, a second rear longitudinal beam 23, a first rear transverse beam 24, and a second rear transverse beam 25 are all aluminum alloy extruded profiles, all manufactured by extrusion; the first rear longitudinal beam 22, a second rear longitudinal beam 23, a first rear transverse beam 24, and a second rear transverse beam 25 are all welded together; a rear anti-collision beam 26 has internal reinforcing ribs and is an aluminum alloy extruded profile, manufactured by extrusion.

[0055] This embodiment also provides a chassis, which includes the aforementioned lower body structure, front subframe structure, battery tray structure and rear subframe structure.

[0056] This embodiment also provides a vehicle including the chassis described above.

[0057] Furthermore, as a preferred embodiment, the front bumper beam 1, the first energy-absorbing pillar 2, the second energy-absorbing pillar 3, the third energy-absorbing pillar 4, the fourth energy-absorbing pillar 5, the first front longitudinal beam 10, the second front longitudinal beam 11, the lower front crossbeam 12, the first front floor connecting beam 13, the second front floor connecting beam 14, the first inner sill beam 15, the second inner sill beam 16, the first outer sill beam 17, the second outer sill beam 18, the lower rear crossbeam 19, the first rear floor connecting beam 20, the second rear floor connecting beam 21, the first rear longitudinal beam 22, the second rear longitudinal beam 23, the first rear crossbeam 24, the second rear crossbeam 25, and the rear bumper beam 26 are all made of AL-Si alloys. More specifically, all of the above components are made of 6082 aluminum alloy. The yield strength of 6082 aluminum alloy extrusion can reach over 250 MPa, far exceeding the yield strength of ordinary castings. The components are connected by welding, which can greatly improve the rigidity of the overall structure. This embodiment applies the PTC integrated design concept for the first time to the design and development of an integrated extruded aluminum alloy lower body platform using large-section and complex-cavity aluminum profiles as key connecting parts. The overall structure of the lower body adopts a "well" shape, which can smoothly transmit and receive forces. In the event of a collision, the protection system transmits the impact force to the front anti-collision beam assembly and the front longitudinal beam assembly, and then transmits the force to the sill beam assemblies on the left and right sides through the front bulkhead connecting mechanism. This structure will not compress the battery pack in the middle of the car, thus protecting the battery pack.

[0058] In this embodiment, all crossbeams and longitudinal beams are made of high-strength multi-cavity extruded profiles, which can further improve product performance. First, the multiple cavities of the longitudinal beams are composed of multiple single tubular composites. In mechanics, there is a saying that a pillar can support a thousand pounds. At the same time, the mechanical properties are increased geometrically when these single tubes are stacked together. Second, in the crossbeam structure, the front section of the crossbeam adopts a large plane with multiple diagonal reinforcing ribs inside, forming multiple triangles. The triangular spatial structure is the most stable and can provide good support and transmission of force, ensuring the overall rigidity and strength of the crossbeam.

[0059] The underbody structure implemented in this embodiment shows a significant improvement in rigidity compared to existing steel-aluminum hybrid and all-steel underbody structures. This underbody structure offers greater flexibility in material selection, ensuring that the right material is used for the right body part. Furthermore, while existing integrated die-cast underbody chassis simplifies the original rear floor plate's more than 70 welded parts into a single component, practical applications are still limited by disadvantages such as equipment cost, precision control, maintenance difficulty, casting defects, manufacturing limitations, and environmental impact. Moreover, adopting this technology requires mass production as a prerequisite; otherwise, the high equipment investment and mold costs cannot be amortized. From an economic perspective, the underbody structure implemented in this embodiment is more cost-effective.

[0060] This embodiment utilizes a ring-shaped composite beam pulsed laser welding technology for high-strength aluminum alloy multi-cavity structural profiles used in the core components of the underbody structure. Based on factors such as part materials, welding structure, and welding technology, and focusing on improving the joint performance of welded parts, this innovative welding technology replaces traditional cast aluminum alloys with multi-cavity complex extruded profiles. The ring-shaped composite beam pulsed laser welding technology features a ring-shaped composite beam, forming a larger and more stable keyhole, allowing for easier escape of metal vapors. It minimizes molten metal contamination, increases welding speed while reducing spatter by 90% or more, stabilizes the molten pool, and controls cooling to overcome shrinkage stress, achieving crack-free welding. By adjusting welding process parameters and analyzing the weld quality and post-weld mechanical properties, the influence of different welding process parameters on weld formation was investigated. This addresses the challenge of complex casting processes and numerous material defects affecting chassis manufacturing performance.

[0061] The embodiments of this utility model are given for illustrative and descriptive purposes only, and are not intended to be exhaustive or to limit the utility model to the forms disclosed. Many modifications and variations will be apparent to those skilled in the art. The embodiments were chosen and described in order to better illustrate the principles and practical applications of this utility model, and to enable those skilled in the art to understand this utility model and design various embodiments with various modifications suitable for a particular purpose.

Claims

1. A vehicle body structure, characterized in that, include Front bumper beam (1), wherein the front bumper beam (1) is a hollow profile that bends outward in the middle; Energy-absorbing components are disposed on the left and right sides of the front anti-collision beam (1); A front bumper beam connection assembly, wherein the front bumper beam connection assembly is connected to the energy absorption assembly; The front longitudinal beam assembly includes a first front longitudinal beam (10) and a second front longitudinal beam (11), one end of which is connected to the front anti-collision beam connecting assembly; A front connecting mechanism is connected to the other end of the first front longitudinal beam (10) and the second front longitudinal beam (11), respectively. A door sill beam assembly, comprising a first inner door sill beam (15), a second inner door sill beam (16), a first outer door sill beam (17), and a second outer door sill beam (18). One end of the first inner door sill beam (15) is connected to the front door connecting mechanism. The first outer door sill beam (17) is disposed outside the first inner door sill beam (15). One end of the second inner door sill beam (16) is connected to the front door connecting mechanism. The second outer door sill beam (18) is disposed outside the second inner door sill beam (16). The rear enclosure connecting mechanism is connected to the other end of the first inner sill beam (15) and the second inner sill beam (16); The rear floor frame assembly includes a first rear longitudinal beam (22), a second rear longitudinal beam (23), a first rear cross beam (24), and a second rear cross beam (25). One end of the first rear longitudinal beam (22) and the second rear longitudinal beam (23) are connected to the rear enclosure connecting mechanism. The first rear cross beam (24) is connected to the rear enclosure connecting mechanism. The left and right ends of the first rear cross beam (24) are connected to the first rear floor connecting beam (20) and the second rear floor connecting beam (21), respectively. One end of the second rear cross beam (25) is connected to the first rear longitudinal beam (22), and the other end of the second rear cross beam (25) is connected to the second rear longitudinal beam (23). The rear anti-collision beam connecting assembly is provided, wherein the other ends of the first rear longitudinal beam (22) and the second rear longitudinal beam (23) are both connected to the rear anti-collision beam connecting assembly; The rear anti-collision beam (26) is a hollow profile that bends outward in the middle, and the left and right sides of the rear anti-collision beam (26) are connected to the rear anti-collision beam connecting assembly.

2. The undercarriage structure according to claim 1, characterized in that, The energy-absorbing component includes a first energy-absorbing column (2), a second energy-absorbing column (3), a third energy-absorbing column (4), and a fourth energy-absorbing column (5). The first energy-absorbing column (2), the second energy-absorbing column (3), the third energy-absorbing column (4), and the fourth energy-absorbing column (5) are all square tube structures with internal reinforcing ribs. One end of the first energy-absorbing column (2) and one end of the second energy-absorbing column (3) are respectively connected to the left side of the front anti-collision beam (1). One end of the third energy-absorbing column (4) and one end of the fourth energy-absorbing column (5) are respectively connected to the right side of the front anti-collision beam (1). The first energy-absorbing column (2), the second energy-absorbing column (3), the third energy-absorbing column (4) and the fourth energy-absorbing column (5) are all aluminum alloy extruded profiles, all made by extrusion. The first energy-absorbing column (2), the second energy-absorbing column (3), the third energy-absorbing column (4) and the fourth energy-absorbing column (5) are connected to the front anti-collision beam (1) by welding. The third energy-absorbing column (4) and the fourth energy-absorbing column (5) are connected to the second front anti-collision beam connecting plate (8) by welding.

3. The undercarriage structure according to claim 2, characterized in that, The front bumper beam connection assembly includes a first front bumper beam connection plate (6), a first front longitudinal beam connection plate (7), a second front bumper beam connection plate (8), and a second front longitudinal beam connection plate (9). The first front bumper beam connection plate (6) is welded to the other end of the first energy-absorbing column (2) and the other end of the second energy-absorbing column (3). The first front bumper beam connection plate (6) is bolted to the first front longitudinal beam connection plate (7). The first front longitudinal beam connection plate (7) is welded to the first front longitudinal beam (10). The second front bumper beam connection plate (8) is welded to the other end of the third energy-absorbing column (4) and the other end of the fourth energy-absorbing column (5). The second front bumper beam connection plate (8) is bolted to the second front longitudinal beam connection plate (9). The second front longitudinal beam connection plate (9) is welded to the second front longitudinal beam (11).

4. The undercarriage structure according to claim 3, characterized in that, The front connecting mechanism includes a first front floor connecting beam (13), a second front floor connecting beam (14), and a front lower crossbeam (12). The first front floor connecting beam (13) and the second front floor connecting beam (14) are both bent hollow profiles and are symmetrically arranged at the left and right ends of the front lower crossbeam (12). The front lower crossbeam (12) is a hollow profile. The other end of the first front longitudinal beam (10) is welded to one side of the first front floor connecting beam (13). The first inner sill beam (15) is welded to the other side of the first front floor connecting beam (13). The other end of the second front longitudinal beam (11) is welded to one side of the second front floor connecting beam (14). The second inner sill beam (16) is welded to the other side of the second front floor connecting beam (14). The lower front crossbeam (12), the first front floor connecting beam (13), and the second front floor connecting beam (14) are provided with reinforcing ribs. The lower front crossbeam (12), the first front floor connecting beam (13), and the second front floor connecting beam (14) are all aluminum alloy extruded profiles and are all made by extrusion. The first front floor connecting beam (13) and the second front floor connecting beam (14) are connected to the lower front crossbeam (12) by welding.

5. The undercarriage structure according to claim 4, characterized in that, The rear connecting mechanism includes a first rear floor connecting beam (20), a second rear floor connecting beam (21), and a rear lower crossbeam (19). The first rear floor connecting beam (20) and the second rear floor connecting beam (21) are both bent hollow profiles and are symmetrically arranged at the left and right ends of the rear lower crossbeam (19). The rear lower crossbeam (19) is a hollow profile. The other end of the first inner sill beam (15) is welded to one side of the first rear floor connecting beam (20). One end of the first rear longitudinal beam (22) is welded to the other side of the first rear floor connecting beam (20). The other end of the second inner sill beam (16) is welded to one side of the second rear floor connecting beam (21). One end of the second rear longitudinal beam (23) is welded to the other side of the second rear floor connecting beam (21). The lower rear crossbeam (19), the first rear floor connecting beam (20), and the second rear floor connecting beam (21) are all square tubes with internal reinforcing ribs. The lower rear crossbeam (19), the first rear floor connecting beam (20), and the second rear floor connecting beam (21) are all aluminum alloy extruded profiles, all made by extrusion. The first rear floor connecting beam (20) and the second rear floor connecting beam (21) are connected to the lower rear crossbeam (19) by welding.

6. The undercarriage structure according to claim 5, characterized in that, The rear anti-collision beam connecting assembly includes a first rear anti-collision beam connecting plate (27), a first rear longitudinal beam connecting plate (28), a second rear anti-collision beam connecting plate (29), and a second rear longitudinal beam connecting plate (30). The first rear longitudinal beam connecting plate (28) is welded to the other end of the first rear longitudinal beam (22). The first rear longitudinal beam connecting plate (28) is bolted to the first rear anti-collision beam connecting plate (27). The first rear anti-collision beam connecting plate (27) is welded to one side of the rear anti-collision beam (26). The other end of the second rear longitudinal beam (23) is welded to the second rear longitudinal beam connecting plate (30). The second rear longitudinal beam connecting plate (30) is bolted to the second rear anti-collision beam connecting plate (29). The second rear anti-collision beam connecting plate (29) is welded to the other side of the rear anti-collision beam (26).

7. The undercarriage structure according to claim 1, characterized in that, The first front longitudinal beam (10) is provided with a first damping tower, and the second front longitudinal beam (11) is provided with a second damping tower. The first damping tower includes a first damping tower connecting plate (31) and a first damping tower cover plate (32) that are connected to each other. The first damping tower connecting plate (31) is connected to the first front longitudinal beam (10) by welding. The second damping tower includes a second damping tower connecting plate (33) and a second damping tower cover plate (34) that are connected to each other. The second damping tower connecting plate (33) is connected to the second front longitudinal beam (11) by welding. The first shock absorber tower connecting plate (31) and the first shock absorber tower cover plate (32) are connected by welding, and the second shock absorber tower connecting plate (33) and the second shock absorber tower cover plate (34) are connected by welding. The first rear longitudinal beam (22) is provided with a first rear wheel cover, and the second rear longitudinal beam (23) is provided with a second rear wheel cover. The first rear wheel cover includes a first rear wheel cover connecting plate (35), a second rear wheel cover connecting plate (36), and a first rear wheel cover cover plate (37). The upper ends of the first rear wheel cover connecting plate (35) and the second rear wheel cover connecting plate (36) are respectively welded to the left and right ends of the first rear wheel cover cover plate (37). The lower ends of the first rear wheel cover connecting plate (35) and the second rear wheel cover connecting plate (36) are respectively... The first rear longitudinal beam (22) is connected by welding. The second rear wheel cover includes a third rear wheel cover connecting plate (38), a fourth rear wheel cover connecting plate (39), and a second rear wheel cover plate (40). The upper ends of the third rear wheel cover connecting plate (38) and the fourth rear wheel cover connecting plate (39) are respectively connected to the left and right ends of the second rear wheel cover plate (40) by welding. The lower ends of the third rear wheel cover connecting plate (38) and the fourth rear wheel cover connecting plate (39) are respectively connected to the second rear longitudinal beam (23) by welding. The first rear longitudinal beam (22) is provided with a first rear subframe rear mounting beam (41), and the second rear longitudinal beam (23) is provided with a second rear subframe rear mounting beam (42).

8. The undercarriage structure according to claim 4, characterized in that, The front anti-collision beam (1) is provided with reinforcing ribs inside. The front anti-collision beam (1) is an aluminum alloy extruded profile, which is made by extrusion. The first front longitudinal beam (10) and the second front longitudinal beam (11) are both square tube structures with internal reinforcing ribs. The first front longitudinal beam (10) and the second front longitudinal beam (11) are both aluminum alloy extruded profiles, which are both made by extrusion. The first inner sill beam (15), the second inner sill beam (16), the first outer sill beam (17), and the second outer sill beam (18) are all square tube structures with internal reinforcing ribs. The first inner sill beam (15), the second inner sill beam (16), the first outer sill beam (17), and the second outer sill beam (18) are all aluminum alloy extruded profiles, all made by extrusion. The first inner sill beam (15) is welded to the first front floor connecting beam (13) and the first rear floor connecting beam (20). The first outer sill beam (17) is welded to the first inner sill beam (15). The second inner sill beam (16) is welded to the second front floor connecting beam (14) and the second rear floor connecting beam (21). The second outer sill beam (18) is welded to the second inner sill beam (16). The first rear longitudinal beam (22), the second rear longitudinal beam (23), the first rear cross beam (24), and the second rear cross beam (25) are all square tubes with internal reinforcing ribs. The first rear longitudinal beam (22), the second rear longitudinal beam (23), the first rear cross beam (24), and the second rear cross beam (25) are all aluminum alloy extruded profiles, all made by extrusion. The first rear longitudinal beam (22), the second rear longitudinal beam (23), the first rear cross beam (24), and the second rear cross beam (25) are all connected by welding. The rear anti-collision beam (26) is provided with reinforcing ribs inside. The rear anti-collision beam (26) is an aluminum alloy extruded profile, which is made by extrusion.

9. A chassis, characterized in that, The chassis includes the underbody structure as described in any one of claims 1-8.

10. A vehicle, characterized in that, The vehicle includes the chassis as described in claim 9.

Images