Rear floor assembly and vehicle

Abstract

The present application provides a rear floor assembly and a vehicle. The rear floor assembly includes a rear floor panel, a rear longitudinal beam assembly, a rear wheel cover assembly and a rear cross beam assembly. The rear longitudinal beam assembly is arranged on both sides of the rear floor panel and extends along the length direction of the vehicle body. The rear wheel cover assembly is arranged on the rear longitudinal beam assembly and is located on the outside of the rear longitudinal beam assembly. The rear cross beam assembly extends along the width direction of the vehicle body and is connected to the rear wheel cover assembly. The rear floor panel, the rear longitudinal beam assembly, the rear wheel cover assembly and the rear cross beam assembly are an integrally formed structure. A plurality of thin-walled cavities are formed on the rear longitudinal beam assembly, the rear wheel cover assembly and the rear cross beam assembly. The rear floor panel, the rear longitudinal beam assembly, the rear wheel cover assembly and the rear cross beam assembly of the present application are integrally formed, and the rear floor assembly has a high degree of integration and a short manufacturing cycle. At the same time, the plurality of thin-walled cavities formed in the rear floor assembly can improve the rigidity and collision force transmission effect.

Description

Technical Field

[0001] The present application relates to the field of vehicles, and in particular to a rear floor assembly and a vehicle. Background Art

[0002] As people's living standards continue to improve, many different types of vehicles have appeared on the market. The rear floor assembly is one of the important load-bearing components of the vehicle body, and the rear floor assembly can also resist the impact of the rear end of the vehicle. In the relevant technology, the traditional steel rear floor requires dozens of sheet metal parts to be connected and strengthened through spot welding technology to form an integral structure. There are many parts and many restrictive factors, the integration is low and the manufacturing cycle is long. Although the existing one-piece die-cast aluminum alloy rear floor has realized the integration of sheet metal parts, it is affected by the demolding process and an opening design is required in the main area of ​​the rear floor assembly. The opening structure makes the stiffness and collision force transmission effect of the rear floor assembly poor.

[0003] Therefore, it is necessary to provide an improved rear floor assembly and a vehicle to solve the above problems. Summary of the invention

[0004] The present application provides a rear floor assembly and a vehicle with high rigidity and good collision force transmission effect.

[0005] The present application provides a rear floor assembly, comprising a rear floor panel, a rear longitudinal beam assembly, a rear wheel cover assembly and a rear cross beam assembly; the rear longitudinal beam assembly is arranged on both sides of the rear floor panel and extends along the length direction of the vehicle body; the rear wheel cover assembly is arranged on the rear longitudinal beam assembly and is located on the outside of the rear longitudinal beam assembly; the rear cross beam assembly extends along the width direction of the vehicle body and is connected to the rear wheel cover assembly; the rear floor panel, the rear longitudinal beam assembly, the rear wheel cover assembly and the rear cross beam assembly are an integrally formed structure; a plurality of thin-walled cavities are formed on the rear longitudinal beam assembly, the rear wheel cover assembly and the rear cross beam assembly.

[0006] Furthermore, the rear floor panel, the rear longitudinal beam assembly, the rear wheel cover assembly and the rear cross beam assembly are integrally formed by a vacuum centrifugal casting process; the vacuum centrifugal casting process uses a sand core as a mold and adopts vacuum adsorption technology during centrifugal casting.

[0007] Furthermore, the rear crossbeam assembly includes a rear crossbeam and a crossbeam connecting plate, and the multiple thin-walled cavities include a first chamber, a second chamber and a third chamber, the first chamber is formed by the rear crossbeam; the second chamber is formed by the rear crossbeam, the crossbeam connecting plate and the rear wheel cover assembly; the third chamber is formed by the rear longitudinal beam assembly and the rear wheel cover assembly.

[0008] Furthermore, the first chamber, the second chamber and the third chamber are all closed structures; the second chamber is located above the first chamber and the third chamber, and the third chamber is located at both ends of the first chamber; the two ends of the first chamber, the second chamber and the third chamber are all triangular.

[0009] Furthermore, the multiple thin-walled cavities include a first sub-cavity and a second sub-cavity located at the top and a third sub-cavity located at the bottom; the rear wheel cover assembly includes a wheel cover body, a shock absorber mounting surface and a locally thickened shock absorber mounting point; a through hole is provided on the shock absorber mounting point; the first sub-cavity and the second sub-cavity are formed by the wheel cover body, the shock absorber mounting surface and the shock absorber mounting point; the third sub-cavity is formed by the wheel cover body, the shock absorber mounting surface and the rear longitudinal beam assembly.

[0010] Furthermore, the cross beam connecting plate is connected to the wheel cover body and is located above the shock absorber mounting point, and the second chamber is close to the shock absorber mounting point.

[0011] Furthermore, the first sub-cavity, the second sub-cavity and the third sub-cavity are all closed structures; the second sub-cavity and the third sub-cavity are approximately triangular.

[0012] Furthermore, the multiple thin-walled cavities include a fourth chamber, which is formed by the rear longitudinal beam assembly; the fourth chamber is located on both sides of the rear floor panel and extends along the length direction of the vehicle body; the fourth chamber is a closed structure; and the fourth chamber is rectangular.

[0013] Furthermore, the rear longitudinal beam assembly includes a rear longitudinal beam top plate, a rear longitudinal beam bottom plate and a support plate located in the fourth cavity and extending along the length direction of the vehicle body; the rear longitudinal beam top plate, the rear longitudinal beam bottom plate and the support plate together form a double-layer cavity.

[0014] Furthermore, the double-layer cavity includes a first cavity located on the upper layer and a second cavity and a third cavity located on the lower layer; the support plate is connected with an outer flange and an inner flange along the height direction of the vehicle body, and the outer flange and the inner flange protrude out of the rear longitudinal beam bottom plate; the first cavity is formed by the rear longitudinal beam top plate and the support plate; the second cavity is formed by the rear longitudinal beam bottom plate, the support plate, the outer flange and the inner flange; the third cavity is formed by the rear longitudinal beam bottom plate, the support plate and the outer flange.

[0015] Furthermore, the first cavity, the second cavity and the third cavity are closed structures; the first cavity and the second cavity are rectangular; the third cavity is trapezoidal; the second cavity is provided with a reinforcing rib extending downward from the support plate, the reinforcing rib is arranged obliquely and connected to the rear longitudinal beam bottom plate and the inner flange.

[0016] Furthermore, a rear seat mounting portion is formed in the middle portion of the rear floor panel, and the rear seat mounting portion is located at the front side of the rear cross beam assembly; the rear seat mounting portion includes a seat mounting plate, a seat support plate extending from the seat mounting plate, and a partition plate arranged along the length direction of the vehicle body; the seat mounting plate is connected to the front side wall of the rear cross beam assembly; the seat support plate is inclined and the two ends are respectively connected to the rear floor panel and the seat mounting plate, and the partition plate is located below the seat mounting plate and connected to the middle portion of the seat support plate; the seat mounting plate, the seat support plate, the partition plate, the front side wall and the rear floor panel together form a double-layer cavity.

[0017] Furthermore, the double-layer cavity includes a first cavity located on the upper layer and a second cavity located on the lower layer; the first cavity is formed by the seat mounting plate, the seat support plate, the upper portion of the front side wall and the partition plate; the second cavity is formed by the partition plate, the seat support plate, the lower portion of the front side wall and the rear floor panel.

[0018] Furthermore, the double-layer cavity, the first cavity and the second cavity are closed structures and are approximately trapezoidal; a locally thickened rear seat mounting point is formed in the first cavity along the height direction of the vehicle body; a locally thickened battery pack mounting point is formed in the second cavity along the height direction of the vehicle body; the rear seat mounting point and the battery pack mounting point are provided with through holes.

[0019] The present application also provides a vehicle, comprising the above-mentioned rear floor assembly.

[0020] The rear floor panel, rear longitudinal beam assembly, rear wheel cover assembly and rear cross beam assembly of the present application are integrally formed, and the rear floor assembly has a high degree of integration, which simplifies the design and shortens the manufacturing cycle. At the same time, the multiple thin-walled cavities formed in the rear floor assembly can improve the rigidity and collision force transmission effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the floor assembly after this application.

[0022] Figure 2 yes Figure 1 A top view of the rear floor assembly is shown.

[0023] Figure 3 yes Figure 1 Side view of the rear floor assembly shown.

[0024] Figure 4 yes Figure 1 A cross-sectional view of the rear longitudinal beam assembly of the rear floor assembly.

[0025] Figure 5 yes Figure 2 A cross-section of the rear floor assembly along line AA is shown.

[0026] Figure 6 yes Figure 2 A cross-sectional view of the rear floor assembly along line BB is shown.

[0027] Figure 7 yes Figure 3 A cross-sectional view of the rear floor assembly along line CC is shown.

[0028] Figure 8 yes Figure 1 A partial schematic diagram of the rear floor assembly from another perspective is shown.

[0029] Fig. 9 yes Figure 2 A cross-section of the rear floor assembly along line DD is shown.

[0030] Fig.10 yes Fig. 9 An enlarged view of a portion of the rear floor assembly is shown.

[0031] Description of Figure Numbers:

[0032] 10. Rear floor panel; 11. Front cross beam of rear floor; 20. Rear longitudinal beam assembly; 201. Fourth chamber; 21. Rear longitudinal beam top plate; 22. Rear longitudinal beam bottom plate; 221. Spring mounting surface; 23. Support plate; 24. Double-layer cavity; 241. First cavity; 242. Second cavity; 243. Third cavity; 25. Outer flange; 251. Spring mounting groove; 26. Inner flange; 27. Reinforcement rib; 28. Reinforcement rib; 30. Rear wheel cover assembly; 301. First sub-cavity; 302. Second sub-cavity; 303. Third sub-cavity; 31. Wheel cover body; 32. Shock absorber mounting surface; 33. Shock absorber mounting point ; 331, through hole; 40, rear crossbeam assembly; 401, first chamber; 402, second chamber; 403, third chamber; 41, rear crossbeam; 411, front side wall; 412, top wall; 42, crossbeam connecting plate; 50, rear seat mounting portion; 51, seat mounting plate; 52, seat support plate; 53, partition plate; 54, first cavity; 541, rear seat mounting point; 542, through hole; 543, first sub-cavity; 544, second sub-cavity; 55, second cavity; 551, battery pack mounting point; 552, through hole; 553, third sub-cavity; 554, fourth sub-cavity; 60, shock absorber spring mounting portion. DETAILED DESCRIPTION

[0033] Here, the technical solutions in the embodiments (or "implementation methods") of the present application will be described clearly and completely in conjunction with the accompanying drawings. When the following description refers to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements.

[0034] If there are terms involving directional indications or positional relationships in the embodiments of the present application (such as up, down, left, right, front, back, inside, outside, top, bottom, center, vertical, horizontal, longitudinal, transverse, length, width, counterclockwise, clockwise, axial, radial, circumferential, etc.), such terms are only used to explain the relative positional relationship, movement, etc. between the components under a certain specific posture (as shown in the accompanying drawings); if the specific posture changes, the directional indication or positional relationship will also change accordingly. In addition, the terms "first" and "second" in the embodiments of the present application are only used for the purpose of convenience of description and cannot be understood as indicating or implying relative importance.

[0035] See also Figure 1 , Figure 2 and Figure 3 As shown, the rear floor assembly includes a rear floor panel 10, a rear longitudinal beam assembly 20, a rear wheel housing assembly 30 and a rear cross beam assembly 40. The rear longitudinal beam assembly 20 is arranged on both sides of the rear floor panel 10 and extends along the length direction of the vehicle body. The rear wheel housing assembly 30 is arranged on the rear longitudinal beam assembly 20 and is located outside the rear longitudinal beam assembly 20. The rear cross beam assembly 40 extends along the width direction of the vehicle body and is connected to the rear wheel housing assembly 30.

[0036] The rear floor panel 10, the rear longitudinal beam assembly 20, the rear wheel cover assembly 30 and the rear cross beam assembly 40 are integrally formed by a vacuum centrifugal casting process. The vacuum centrifugal casting process uses a sand core as a mold and uses vacuum adsorption technology during centrifugal casting. Compared with dozens of parts of the traditional sheet metal rear floor assembly, the rear floor assembly of the present application is integrally formed into one part, which has a higher degree of integration and simplifies the design and shortens the manufacturing cycle.

[0037] The rear longitudinal beam assembly 20, the rear wheel cover assembly 30 and the rear cross beam assembly 40 are all formed with multiple thin-walled cavities. Compared with the traditional die-casting process, the rear floor assembly of the present application can form multiple closed thin-walled cavities without being affected by the demolding process, thereby improving the rigidity and collision force transmission effect of the rear floor assembly. According to the implementation mode of the present application, the rear floor panel 10, the rear longitudinal beam assembly 20, the rear wheel cover assembly 30 and the rear cross beam assembly 40 are all made of steel, which solves the problem that the rear floor assembly uses aluminum alloy material and needs to increase the material thickness to improve the rigidity, thereby improving the quality of the parts.

[0038] The rear floor panel 10 is a single-layer plate structure. The rear floor panel 10 extends along the length direction of the vehicle body, that is, the front-to-rear direction of the vehicle. Both sides of the rear floor panel 10 are connected to the rear longitudinal beam assembly 20. A rear floor front cross beam 11 is formed on the rear floor panel 10. The rear floor front cross beam 11 extends along the width direction of the vehicle body and is located in front of the rear cross beam assembly 40. The rear floor panel 10 and the rear floor front cross beam 11 together form a closed thin-walled cavity.

[0039] According to an embodiment of the present application, a rear seat front mounting point is provided on the rear floor front cross beam 11 for mounting the front of the rear seat.

[0040] See also Figure 4 and Figure 5 As shown, the rear longitudinal beam assembly 20 encloses and forms a fourth cavity 201. The fourth cavity 201 is located on both sides of the rear floor panel 10 and extends along the length direction of the vehicle body. The fourth cavity 201 is rectangular and is a closed thin-walled cavity. Due to the influence of the demolding process of the traditional one-piece die-cast rear floor assembly, the rear longitudinal beam assembly requires an opening design. The fourth cavity 201 of the rear longitudinal beam assembly 20 of the rear floor assembly of the present application is a completely closed section and the fourth cavity 201 smoothly passes through the rear floor panel 10. The rigidity of the rear longitudinal beam assembly 20 is relatively high and the collision force is transmitted smoothly.

[0041] The rear longitudinal beam assembly 20 includes a rear longitudinal beam top plate 21, a rear longitudinal beam bottom plate 22, and a support plate 23 located in the fourth chamber 201 and extending along the length direction of the vehicle body. The rear longitudinal beam top plate 21, the rear longitudinal beam bottom plate 22, and the support plate 23 together form a double-layer cavity 24, and the double-layer cavity 24 is a shock absorber spring mounting portion 60.

[0042] The double-layer cavity 24 includes a first cavity 241 located in the upper layer and a second cavity 242 and a third cavity 243 located in the lower layer. Two outer flanges 25 and two inner flanges 26 are connected to the support plate 23 along the height direction of the vehicle body. The two outer flanges 25 are arranged on the outside of the two inner flanges 26. The outer flanges 25 and the inner flanges 26 protrude out of the rear longitudinal beam bottom plate 22, and the protruding parts of the outer flanges 25 and the inner flanges 26 are surrounded by the rear longitudinal beam bottom plate 22 to form a spring installation groove 251. The shock absorber spring of the vehicle is accommodated in the spring installation groove 251. The rear longitudinal beam bottom plate 22 between the outer flanges 25 and the inner flanges 26 is a spring installation surface 221. One end of the shock absorber spring of the vehicle is against the spring installation surface 221.

[0043] The outer flange 25 protrudes from the rear longitudinal beam bottom plate 22 to limit the shock absorber spring, so that when the shock absorber spring matches the chassis spring, the gap is smaller and the anti-movement effect is better. The inner flange 26 protrudes from the rear longitudinal beam bottom plate 22 to guide the installation of the shock absorber spring, and at the same time, the strength of the inner flange 26 can be strengthened to improve the limiting effect of the shock absorber spring.

[0044] The first cavity 241, the second cavity 242 and the third cavity 243 are closed structures. The cross section of the first cavity 241 is approximately rectangular, the cross section of the second cavity 242 is rectangular, and the cross section of the third cavity 243 is trapezoidal. The rear longitudinal beam top plate 21 and the support plate 23 enclose the first cavity 241. The rear longitudinal beam bottom plate 22, the support plate 23, the outer flange 25 and the inner flange 26 enclose the second cavity 242. The rear longitudinal beam bottom plate 22, the support plate 23 and the outer flange 25 enclose the third cavity 243.

[0045] A reinforcing rib 27 extending downward from the support plate 23 is provided in the second cavity 242. The reinforcing rib 27 is arranged obliquely and connected to the rear longitudinal beam bottom plate 22 and the inner flange 26. A reinforcing rib 28 is arranged obliquely and connected to the support plate 23 and the outer flange 25. The arrangement of the reinforcing rib 27 and the reinforcing rib 28 improves the strength of the second cavity 242. The arrangement of the first cavity 241, the second cavity 242 and the third cavity 243 improves the local stiffness of the shock absorber spring mounting portion 60.

[0046] According to the implementation of the present application, the rear portion of the rear longitudinal beam assembly 20 adopts a uniform uniform cross section. The rear floor assembly of the present application adopts a vacuum centrifugal casting process, and the rear longitudinal beam assembly 20 is a closed structure. The cross section of the rear longitudinal beam assembly 20 is consistent within the width of the rear overhang bandwidth of the vehicle. The rear overhang bandwidths of different models are different, and the excessive bandwidth length can be removed by laser cutting to achieve the sharing of the sand core mold.

[0047] See also Figure 6 and Figure 7As shown, the rear wheel cover assembly 30 includes a wheel cover body 31, a shock absorber mounting surface 32 and a partially thickened shock absorber mounting point 33. The shock absorber mounting point 33 is arranged at the middle and lower part of the shock absorber mounting surface 32. The wheel cover body 31, the shock absorber mounting surface 32 and the partially thickened shock absorber mounting point 33 enclose a plurality of thin-walled cavities.

[0048] The plurality of thin-walled cavities include a first sub-cavity 301 and a second sub-cavity 302 located at the top and a third sub-cavity 303 located at the bottom. The wheel cover body 31, the shock absorber mounting surface 32 and the shock absorber mounting point 33 together form the first sub-cavity 301. The wheel cover body 31, the shock absorber mounting surface 32 and the shock absorber mounting point 33 together form the second sub-cavity 302. The wheel cover body 31, the shock absorber mounting surface 32 and the rear longitudinal beam assembly 20 together form the third sub-cavity 303. The shock absorber mounting point 33 is provided with a through hole 331. The through hole 331 is used for the shock absorber mounting bolt to extend into.

[0049] The first sub-cavity 301, the second sub-cavity 302 and the third sub-cavity 303 are all closed structures. The second sub-cavity 302 and the third sub-cavity 303 are approximately triangular. When a vehicle is driving on a bumpy road, the impact force generated by the ground will be transmitted to the shock absorber mounting point 33 through the chassis. If the mounting point is not stiff enough, the vehicle will be damaged. The first sub-cavity 301, the second sub-cavity 302 and the third sub-cavity 303 are formed around the shock absorber mounting point 33, which improves the stiffness around the shock absorber mounting point 33.

[0050] The rear cross beam assembly 40 includes a rear cross beam 41 and a cross beam connecting plate 42. The rear cross beam 41 is arranged along the width direction of the vehicle body, and the two ends of the rear cross beam 41 are connected to the rear longitudinal beam assembly 20 and the rear wheel cover assembly 30. A front side wall 411 is provided on the front side of the rear cross beam 41. The cross beam connecting plate 42 is arranged obliquely, and the two ends of the cross beam connecting plate 42 are respectively connected to the wheel cover body 31 and the top wall 412 of the rear cross beam 41. A plurality of thin-walled cavities are formed in the rear cross beam assembly 40. The plurality of thin-walled cavities include a first cavity 401, a second cavity 402 and a third cavity 403. The rear cross beam 41 encloses the first cavity 401. The rear cross beam 41, the cross beam connecting plate 42 and the rear wheel cover assembly 30 enclose the second cavity 402. The rear longitudinal beam assembly 20 and the rear wheel cover assembly 30 enclose the third cavity 403.

[0051] The first chamber 401, the second chamber 402 and the third chamber 403 are all closed structures. The second chamber 402 is located above the first chamber 401 and the third chamber 403. The third chamber 403 is located at both ends of the first chamber 401. Both ends of the first chamber 401, the second chamber 402 and the third chamber 403 are all triangular.

[0052] The rear crossbeam 41, the crossbeam connecting plate 42 and the rear wheel cover assembly 30 form a C-ring structure of the vehicle, and the C-ring structure is a key joint connecting the rear wheel cover assembly 30 and the rear floor panel 10. When the car is driving on a bumpy road, the rear wheel cover assembly 30 will be subjected to impact force, which will cause the wheel cover body 31 to tilt and twist. The C-ring structure connects and supports the rear wheel cover assembly 30 and the rear floor panel 10. A plurality of mutually supporting triangular chambers are formed in the C-ring structure, which improves the strength and rigidity of the C-ring structure, can better support and control the tilt and twist of the rear wheel cover assembly 30, and has a highly efficient support and control effect.

[0053] The crossbeam connecting plate 42 is connected to the wheel housing body 31 and is located above the shock absorber mounting point 33, and the second chamber 402 is close to the shock absorber mounting point 33. The C-ring structure and the wheel housing body 31 form a closed second chamber 402. The second chamber 402 is directly supported above the shock absorber mounting point 33, which is conducive to improving the rigidity of the shock absorber mounting point 33.

[0054] See also Figure 8 , Fig. 9 and Fig.10 As shown, the rear floor assembly also includes a rear seat mounting portion 50. The rear seat mounting portion 50 is formed on the rear floor panel 10. The rear seat mounting portion 50 is located at the front side of the rear cross beam assembly 40. The rear seat mounting portion 50 includes a seat mounting plate 51, a seat support plate 52 and a partition plate 53 arranged along the length direction of the vehicle body. The seat mounting plate 51 is connected to the front side wall 411 of the rear cross beam assembly 40. The seat support plate 52 is inclined. The two ends of the seat support plate 52 are respectively connected to the rear floor panel 10 and the seat mounting plate 51. The partition plate 53 is located below the seat mounting plate 51 and connected to the middle of the seat support plate 52. The seat mounting plate 51, the seat support plate 52, the partition plate 53, the front side wall 411 and the rear floor panel 10 together form a double-layer cavity. The double-layer cavity is a closed structure and is approximately trapezoidal.

[0055] The double-layer cavity includes a first cavity 54 located at the upper layer and a second cavity 55 located at the lower layer. The seat mounting plate 51, the seat support plate 52, the upper part of the front side wall 411 and the partition plate 53 together form the first cavity 54. The partition plate 53, the seat support plate 52, the lower part of the front side wall 411 and the rear floor panel 10 together form the second cavity 55. The first cavity 54 and the second cavity 55 are closed structures and are approximately trapezoidal. The seat mounting plate 51 and the seat support plate 52 are seat mounting surfaces, that is, the area where the rear seat is set on the vehicle body. The seat mounting plate 51 and the seat support plate 52 play a role in supporting the rear seat. The partition plate 53 divides the double-layer cavity into the upper and lower first cavity 54 and second cavity 55.

[0056] A partially thickened rear seat mounting point 541 is formed in the first cavity 54 along the height direction of the vehicle body. The rear seat mounting point 541 is used to mount the rear portion of the rear seat. The rear seat mounting point 541 divides the first cavity 54 into a first sub-cavity 543 and a second sub-cavity 544. The rear seat mounting point 541 is connected to the seat mounting plate 51 and the partition plate 53. The rear seat mounting point 541 is provided with a through hole 542 for mounting the rear seat. The cross section of the first sub-cavity 543 is trapezoidal. The cross section of the second sub-cavity 544 is approximately inverted trapezoidal.

[0057] A locally thickened battery pack mounting point 551 is formed in the second cavity 55 along the height direction of the vehicle body. The battery pack mounting point 551 divides the second cavity 55 into a third sub-cavity 553 and a fourth sub-cavity 554. The battery pack mounting point 551 is connected to the partition plate 53 and the rear floor panel 10. The battery pack mounting point 551 is provided with a through hole 552 for mounting the battery pack. The cross-section of the third sub-cavity 553 is trapezoidal. The fourth sub-cavity 554 is approximately inverted trapezoidal. The partition plate 53 connects and supports the rear seat mounting point 541 and the battery pack mounting point 551, and also has a sealing effect.

[0058] The present application also provides a vehicle, comprising the above-mentioned rear floor assembly.

[0059] The rear floor panel 10, rear longitudinal beam assembly 20, rear wheel cover assembly 30, rear cross beam assembly 40 and rear seat mounting portion 50 of the present application are integrally formed by centrifugal casting. The rear floor assembly has a high degree of integration, which simplifies the design and shortens the manufacturing cycle. At the same time, the vacuum centrifugal casting technology can form multiple closed thin-walled cavities in the rear floor assembly, which can improve the rigidity and collision force transmission effect.

[0060] It should be noted that the technical solutions or technical features described in the above embodiments can be combined or supplemented with each other without causing conflicts. The scope of protection of this application is not limited to the precise structures described in the above embodiments and shown in the drawings; all modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of this application should be included in the scope of protection of this application.

Claims

1. A rear floor assembly, characterized in that: The rear floor panel, rear longitudinal beam assembly, rear wheel cover assembly and rear cross beam assembly are included; the rear longitudinal beam assembly is arranged on both sides of the rear floor panel and extends along the length direction of the vehicle body; the rear wheel cover assembly is arranged on the rear longitudinal beam assembly and is located on the outside of the rear longitudinal beam assembly; the rear cross beam assembly extends along the width direction of the vehicle body and is connected to the rear wheel cover assembly; the rear floor panel, the rear longitudinal beam assembly, the rear wheel cover assembly and the rear cross beam assembly are an integrated structure; ... A plurality of thin-walled cavities are formed on the wheel cover assembly and the rear cross beam assembly; the plurality of thin-walled cavities include a first sub-cavity and a second sub-cavity located at the top and a third sub-cavity located at the bottom; the rear wheel cover assembly includes a wheel cover body, a shock absorber mounting surface and a locally thickened shock absorber mounting point; the first sub-cavity and the second sub-cavity are formed by the wheel cover body, the shock absorber mounting surface and the shock absorber mounting point; the third sub-cavity is formed by the wheel cover body, the shock absorber mounting surface and the rear longitudinal beam assembly.

2. The rear floor assembly according to claim 1, characterized in that: The rear floor panel, the rear longitudinal beam assembly, the rear wheel cover assembly and the rear cross beam assembly are integrally formed by a vacuum centrifugal casting process; the vacuum centrifugal casting process uses a sand core as a mold and adopts vacuum adsorption technology during centrifugal casting.

3. The rear floor assembly according to claim 1, characterized in that: The rear crossbeam assembly includes a rear crossbeam and a crossbeam connecting plate, and the multiple thin-walled cavities include a first chamber, a second chamber and a third chamber, the first chamber is formed by the rear crossbeam; the second chamber is formed by the rear crossbeam, the crossbeam connecting plate and the rear wheel cover assembly; the third chamber is formed by the rear longitudinal beam assembly and the rear wheel cover assembly.

4. The rear floor assembly according to claim 3, characterized in that: The first chamber, the second chamber and the third chamber are all closed structures; the second chamber is located above the first chamber and the third chamber, and the third chamber is located at both ends of the first chamber; the two ends of the first chamber, the second chamber and the third chamber are all triangular.

5. The rear floor assembly according to claim 1, characterized in that: A through hole is provided on the shock absorber mounting point.

6. The rear floor assembly according to claim 3, characterized in that: The cross beam connecting plate is connected to the wheel cover body and is located above the shock absorber mounting point, and the second chamber is close to the shock absorber mounting point.

7. The rear floor assembly according to claim 1, characterized in that: The first sub-cavity, the second sub-cavity and the third sub-cavity are all closed structures; the second sub-cavity and the third sub-cavity are approximately triangular.

8. The rear floor assembly according to claim 1, characterized in that: The multiple thin-walled cavities include a fourth cavity, which is formed by the rear longitudinal beam assembly; the fourth cavity is located on both sides of the rear floor panel and extends along the length direction of the vehicle body; the fourth cavity is a closed structure; and the fourth cavity is rectangular.

9. The rear floor assembly according to claim 8, characterized in that: The rear longitudinal beam assembly includes a rear longitudinal beam top plate, a rear longitudinal beam bottom plate and a support plate located in the fourth cavity and extending along the length direction of the vehicle body; the rear longitudinal beam top plate, the rear longitudinal beam bottom plate and the support plate together form a double-layer cavity.

10. The rear floor assembly according to claim 9, characterized in that: The double-layer cavity includes a first cavity located on the upper layer and a second cavity and a third cavity located on the lower layer; the support plate is connected with an outer flange and an inner flange along the height direction of the vehicle body, and the outer flange and the inner flange protrude out of the rear longitudinal beam bottom plate; the first cavity is formed by the rear longitudinal beam top plate and the support plate; the second cavity is formed by the rear longitudinal beam bottom plate, the support plate, the outer flange and the inner flange; the third cavity is formed by the rear longitudinal beam bottom plate, the support plate and the outer flange.

11. The rear floor assembly according to claim 10, characterized in that: The first cavity, the second cavity and the third cavity are closed structures; the first cavity and the second cavity are rectangular; the third cavity is trapezoidal; the second cavity is provided with a reinforcing rib extending downward from the support plate, the reinforcing rib is inclined and connected to the rear longitudinal beam bottom plate and the inner flange.

12. The rear floor assembly according to claim 1, characterized in that: A rear seat mounting portion is formed in the middle portion of the rear floor panel, and the rear seat mounting portion is located at the front side of the rear cross beam assembly; the rear seat mounting portion includes a seat mounting plate, a seat support plate and a partition plate arranged along the length direction of the vehicle body; the seat mounting plate is connected to the front side wall of the rear cross beam assembly; the seat support plate is inclined and the two ends are respectively connected to the rear floor panel and the seat mounting plate, and the partition plate is located below the seat mounting plate and connected to the middle portion of the seat support plate; the seat mounting plate, the seat support plate, the partition plate, the front side wall and the rear floor panel together form a double-layer cavity.

13. The rear floor assembly according to claim 12, characterized in that: The double-layer cavity includes a first cavity located on the upper layer and a second cavity located on the lower layer; the first cavity is formed by the seat mounting plate, the seat support plate, the upper portion of the front side wall and the partition plate; the second cavity is formed by the partition plate, the seat support plate, the lower portion of the front side wall and the rear floor panel.

14. The rear floor assembly according to claim 13, characterized in that: The double-layer cavity, the first cavity and the second cavity are closed structures and are approximately trapezoidal; a locally thickened rear seat mounting point is formed in the first cavity along the height direction of the vehicle body; a locally thickened battery pack mounting point is formed in the second cavity along the height direction of the vehicle body; the rear seat mounting point and the battery pack mounting point are provided with through holes.

15. A vehicle, characterized in that: Comprising the rear floor assembly according to any one of claims 1 to 14.

Images