Rear body assembly and vehicle

Abstract

The application provides a rear body assembly and a vehicle. The rear body assembly comprises an integrally formed rear floor assembly. The rear floor assembly comprises a C-ring cross beam and rear wheel cover assemblies arranged on both sides of the C-ring cross beam. The C-ring cross beam comprises a cross beam body and C-ring branches arranged on both sides of the cross beam body. The C-ring branches comprise front branches and rear branches extending from bottom to top along the rear wheel cover assemblies, and upper portions of the front branches and the rear branches are close to upper edges of the rear wheel cover assemblies. The application integrates the C-ring cross beam and the rear wheel cover assemblies through the integrally formed rear floor assembly, reduces the number of parts and assembly processes, and reduces manufacturing costs. Meanwhile, the front branches and the rear branches extend from bottom to top and the upper portions thereof are close to the upper edges of the rear wheel cover assemblies, forming a double-channel continuous force transmission path, and improving the torsional stiffness of the vehicle body, the handling and stability performance of the vehicle, and the NVH performance.

Description

TECHNICAL FIELD

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

[0002] In recent years, many new technologies, new materials and new processes have emerged, helping the rapid development of new energy vehicles. The performance of the vehicle body, as the basic framework of the vehicle, has been continuously improved, which greatly improves the handling stability, safety, NVH (Noise, Vibration and Harshness performance) and other performances of the vehicle. In the design of the rear body assembly, the arrangement position of the C-ring cross beam and the rear wheel cover assembly has a great influence on the structure and performance of the rear body assembly, which will affect the torsional stiffness and NVH performance of the vehicle body and the comfort of the rear passengers. Most of the vehicles on the current market do not integrate the C-ring cross beam into the rear body assembly or only set a single C-ring cross beam extending to the upper body, which makes it difficult to form a complete force transmission structure between the C-ring cross beam of the rear body assembly and the parts of the upper body. The insufficient torsional stiffness of the vehicle body causes poor NVH performance at the rear, which affects the comfort of the rear passengers.

[0003] Therefore, it is necessary to provide an improved rear body assembly and vehicle to solve the above problems. SUMMARY

[0004] The present application provides a rear body assembly and vehicle with high torsional stiffness and good NVH performance.

[0005] The present application provides a rear body assembly, which comprises an integrally formed rear floor assembly, the rear floor assembly comprising a C-ring cross beam and a rear wheel cover assembly, the rear wheel cover assembly being arranged on both sides of the C-ring cross beam; the C-ring cross beam comprises a cross beam main body and C-ring branches located on both sides of the cross beam main body, the C-ring branches comprising front branches and rear branches extending from bottom to top along the rear wheel cover assembly, the upper parts of the front branches and the rear branches being close to the upper edges of the rear wheel cover assembly.

[0006] Further, the rear body assembly further comprises a C-pillar assembled on the rear floor assembly, the upper part of the front branch being close to the C-pillar, the front branch and the C-pillar being connected by a connecting piece, the connecting piece being simultaneously overlapped on the front branch and the C-pillar.

[0007] Further, the rear body assembly further comprises a rear partition plate assembled on the rear floor assembly, the rear partition plate being located above the rear part of the cross beam main body; the rear branch is arranged close to one side of the rear partition plate, and the rear branch and the rear partition plate are connected by a reinforcing assembly.

[0008] Further, the reinforcing assembly comprises a front connecting plate, a lower connecting plate and a rear connecting plate, the front connecting plate is connected with the rear partition plate and the rear branch, the rear connecting plate is connected with the rear partition plate and the rear wheel cover assembly, and the lower connecting plate is connected with the front connecting plate and the rear connecting plate.

[0009] Further, the rear partition plate comprises a main plate and a closed cavity arranged at the front of the main plate, and the front side of the closed cavity is connected with the front connecting plate.

[0010] Further, the front connecting plate, the lower connecting plate, the rear connecting plate and the main plate form a connecting cavity, and the connecting cavity is connected with the closed cavity.

[0011] Further, the front branch and the rear branch form an acute angle, and the front branch and the rear branch are connected by the rear wheel cover assembly; the edge of the rear wheel cover assembly is provided with a turned edge, and the turned edge is connected with the C column.

[0012] Further, the cross beam body, the front branch and the rear branch are all cavity structures opening downward; the width of the front branch gradually decreases from bottom to top, and the width of the rear branch gradually increases from bottom to top.

[0013] Further, the rear floor assembly further comprises a rear floor front panel, a rear longitudinal beam, a rear floor front cross beam and a rear floor rear cross beam, and the C ring cross beam is located between the rear floor front cross beam and the rear floor rear cross beam; the middle part of the rear floor front panel is provided with an upwardly protruding seat mounting part and a middle channel.

[0014] Further, X-shaped reinforcing ribs and triangular reinforcing ribs are arranged on the cross beam body, the X-shaped reinforcing ribs are arranged at the joints of the cross beam body and the C ring branches, and the triangular reinforcing ribs are arranged at the middle part of the cross beam body.

[0015] Further, fishbone-shaped reinforcing ribs are arranged on the front branch and the rear branch, the fishbone-shaped reinforcing ribs comprise main reinforcing ribs and a plurality of eight-shaped reinforcing ribs, and the main reinforcing ribs extend along the length direction of the front branch and the rear branch.

[0016] Further, the rear body assembly further comprises a shock absorber front mounting point and a shock absorber rear mounting point, the shock absorber front mounting point is arranged at the front side of the front branch, and the shock absorber rear mounting point is arranged between the front branch and the rear branch; the front branch and the rear branch are provided with transverse reinforcing ribs perpendicular to the main reinforcing ribs; the transverse reinforcing ribs are connected with the shock absorber front mounting point and the shock absorber rear mounting point, and the plurality of eight-shaped reinforcing ribs comprise head reinforcing ribs connected with the shock absorber front mounting point and the shock absorber rear mounting point.

[0017] The application also provides a vehicle comprising the rear body assembly.

[0018] The integrally formed rear floor assembly of the application integrates the C-ring cross beam and the rear wheelhouse assembly, reduces the number of parts and assembly procedures, and lowers manufacturing cost; meanwhile, the front branch and the rear branch extend from bottom to top and the upper part is close to the upper edge of the rear wheelhouse assembly, forming a double-channel continuous force transmission path, which improves the body torsional stiffness, the overall vehicle handling and stability performance, and the NVH performance. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 is a structural schematic view of the rear body assembly of the application.

[0020] Figure 2 is a front view of the rear body assembly shown in Figure 1

[0021] Figure 3 is a partial structural schematic view of the rear body assembly of the application.

[0022] Figure 4 is a structural schematic view of the rear body assembly shown in Figure 3

[0023] Figure 5 is a structural schematic view of the rear body assembly shown in Figure 3

[0024] Figure 6 is a structural schematic view of the rear floor assembly of the rear body assembly shown in Figure 1

[0025] Figure 7 is a bottom view of the rear floor assembly shown in Figure 6

[0026] Figure 8 is a side view of the rear floor assembly shown in Figure 6

[0027] Figure 9 is a structural schematic view of the connecting piece of the rear body assembly shown in Figure 1

[0028] is a local structural schematic view of the rear floor assembly of the application at the reinforcing assembly. Figure 10

[0029] Figure 11 is a local structural schematic view of the reinforcing assembly and the rear partition of the application.

[0030] Figure 12 is a structural schematic view of the rear body assembly shown in Figure 1 ​​​​​​​Structure diagram of the reinforcing assembly of the rear body assembly.

[0031] BRIEF DESCRIPTION OF DRAWINGS

[0032] 100, rear floor assembly; 101, front stiffness ring; 102, rear stiffness ring; 10, C-ring cross beam; 11, cross beam main body; 12, C-ring branch; 121, front branch; 122, rear branch; 13, X-shaped reinforcing rib; 14, triangular reinforcing rib; 15, herringbone-shaped reinforcing rib; 151, main reinforcing rib; 152, eight-shaped reinforcing rib; 153, transverse reinforcing rib; 154, head reinforcing rib; 16, rear subframe mounting point; 20, rear wheelhouse assembly; 21, flange; 22, wheelhouse outer panel; 30, rear floor front panel; 31, seat mounting portion; 311, diamond-shaped reinforcing rib; 312, connecting reinforcing rib; 32, center tunnel; 40, rear longitudinal beam; 41, reinforcing rib; 50, rear floor front cross beam; 51, eight-shaped reinforcing rib; 60, rear floor rear cross beam; 61, strip-shaped reinforcing rib; 62, inclined reinforcing rib; 70, shock absorber mounting point; 71, shock absorber front mounting point; 72, shock absorber rear mounting point; 200, C-pillar; 300, rear bulkhead; 301, main panel; 302, closed cavity; 303, front side; 400, connecting piece; 401, protrusion; 402, side flange; 403, lower flange; 500, reinforcing assembly; 501, front connecting panel; 502, lower connecting panel; 503, rear connecting panel; 504, connecting cavity. DETAILED DESCRIPTION

[0033] The technical solutions in the embodiments of the present application will be clearly and completely described herein with reference to the drawings. When the following description refers to the drawings, the same numbers in different drawings represent the same or similar elements unless otherwise indicated.

[0034] If the application embodiments involve directional indications or positional relationships, such terms are used only to explain the relative positional relationships, movement conditions, etc. between components in a certain posture; if the certain posture changes, the directional indications or positional relationships also change accordingly. In addition, the terms "first", "second", etc. in the application embodiments are used only for convenience of description and cannot be understood as indicating or implying relative importance.

[0035] Reference Signs List Figures 1-2As shown, the present application provides a rear body assembly, which comprises a rear floor assembly 100, a C-pillar 200, a rear bulkhead 300, a connecting member 400 and a reinforcing assembly 500. The rear floor assembly 100 is an integrally formed structure. The C-pillar 200 and the rear bulkhead 300 are assembled on the rear floor assembly 100, and the C-pillar 200 is arranged on both sides of the rear bulkhead 300. The rear floor assembly 100 and the C-pillar 200 are connected through the connecting member 400, and the rear floor assembly 100 and the rear bulkhead 300 are connected through the reinforcing assembly 500. The connecting member 400 is located at the front side of the reinforcing assembly 500.

[0036] The rear floor assembly 100 comprises a C-ring cross beam 10, a rear wheel cover assembly 20, a rear floor front panel 30, a rear longitudinal beam 40, a rear floor front cross beam 50, a rear floor rear cross beam 60 and a shock absorber mounting point 70. The C-ring cross beam 10 is located between the rear floor front cross beam 50 and the rear floor rear cross beam 60. The rear wheel cover assembly 20 is arranged on both sides of the C-ring cross beam 10. The rear floor front panel 30 is arranged between the C-ring cross beam 10 and the rear floor front cross beam 50. The rear longitudinal beam 40 is arranged on both sides of the C-ring cross beam 10. The rear floor front cross beam 50 is arranged at the front side of the rear floor rear cross beam 60. The shock absorber mounting point 70 is arranged close to the rear wheel cover assembly 20 and on both sides of the C-ring cross beam 10.

[0037] Please also refer to Figures 3-5 As shown, the C-ring cross beam 10 comprises a cross beam body 11 and C-ring branches 12 arranged on both sides of the cross beam body 11. The C-ring branches 12 extend from the cross beam body 11 along the rear wheel cover assembly 20 from bottom to top. The C-ring branches 12 comprise front branches 121 and rear branches 122. The front branches 121 and the rear branches 122 extend from bottom to top along the rear wheel cover assembly 20. The upper parts of the front branches 121 and the rear branches 122 are close to the upper edges of the rear wheel cover assembly 20. The cross beam body 11, the front branches 121 and the rear branches 122 are all cavity structures with downward openings, which can effectively disperse stress when bearing load, avoid local stress concentration, and thus improve the bending and torsional resistance.

[0038] The upper part of the front branch 121 is close to the C-pillar 200. The front branch 121 and the C-pillar 200 are connected through the connecting member 400, and the connecting member 400 is simultaneously overlapped on the front branch 121 and the C-pillar 200. The cross beam body 11, the front branch 121, the connecting member 400 and the C-pillar 200 form a front stiffness ring 101, the force transmission path is continuous, the torsional stiffness of the vehicle body is significantly improved, and the overall stability of the vehicle body is enhanced.

[0039] The rear branch 122 is arranged below the front of the rear bulkhead 300. The rear branch 122 is arranged close to one side of the rear bulkhead 300, and the rear branch 122 is connected to the rear bulkhead 300 through the reinforcing assembly 500, and the reinforcing assembly 500 is simultaneously overlapped on the rear branch 122 and the rear bulkhead 300. The beam body 11, the rear branch 122, the reinforcing assembly 500, and the rear bulkhead 300 form the rear stiffness ring 102, and the strength and torsional stiffness of the rear body assembly are improved.

[0040] The front branch 121 and the rear branch 122 form an acute angle, approximately in a V shape. The front branch 121 and the rear branch 122 are connected by the rear wheel cover assembly 20. The width of the front branch 121 gradually decreases from bottom to top, and the width of the rear branch 122 gradually increases from bottom to top, so as to adapt to different vehicle models such as a car or an SUV. The arrangement of the front stiffness ring 101 and the rear stiffness ring 102 can effectively improve the torsional stiffness of the vehicle body and improve the NVH and handling performance of the vehicle.

[0041] Referring to Figures 6-8 As shown in the figure, the beam body 11 is provided with an X-shaped reinforcing rib 13 and a triangular reinforcing rib 14. The rear longitudinal beam 40 is provided with a rear subframe mounting point 16 at the connection position of the C-ring beam 10. The X-shaped reinforcing rib 13 is arranged at the joint of the beam body 11 and the C-ring branch 12, which increases the stiffness of the joint and improves the dynamic stiffness at the rear subframe mounting point 16. The triangular reinforcing rib 14 is arranged at the middle part of the beam body 11.

[0042] According to the embodiments of the present application, the triangular reinforcing rib 14 is arranged in multiple and sequentially arranged in the beam body 11. Specifically, a plurality of triangular reinforcing ribs 14 can be sequentially arranged in the beam body 11 along the vehicle width direction. The X-shaped reinforcing rib 13 is arranged in two, and the two X-shaped reinforcing ribs 13 are arranged on both sides of the triangular reinforcing rib 14 along the vehicle width direction.

[0043] The front branch 121 and the rear branch 122 are provided with a fishbone-shaped reinforcing rib 15. The fishbone-shaped reinforcing rib 15 includes a main reinforcing rib 151, a plurality of eight-shaped reinforcing ribs 152, and a transverse reinforcing rib 153. The main reinforcing rib 151 extends along the length direction of the front branch 121 and the rear branch 122. A plurality of eight-shaped reinforcing ribs 152 are sequentially arranged along the length direction of the main reinforcing rib 151. The transverse reinforcing rib 153 is arranged perpendicular to the main reinforcing rib 151. The plurality of eight-shaped reinforcing ribs 152 further include a head reinforcing rib 154 connected to one end of the main reinforcing rib 151 close to the beam body 11.

[0044] According to the embodiments of the present application, the main reinforcement 151, the head reinforcement 154 and the transverse reinforcement 153 form a fish head type reinforcement structure arranged near the shock absorber mounting point 70 to enhance the dynamic stiffness at the shock absorber mounting point 70. A plurality of eight-shaped reinforcements 152 are arranged along the main reinforcement 151 within the open cavity structure of the C-ring branch 12 to form a fishbone type diagonal branch structure.

[0045] In some embodiments, the size of the eight-shaped reinforcements 152 within the front branch 121 gradually decreases from bottom to top. The size of the eight-shaped reinforcements 152 within the rear branch 122 gradually increases from bottom to top. The arrangement position and interval distance of the eight-shaped reinforcements 152 can be adjusted according to requirements.

[0046] The edge of the rear wheelhouse assembly 20 is provided with a flange 21. The upper part of the front branch 121 and the rear branch 122 extends to the flange 21. The flange 21 overlaps the inner side of the C-pillar 200. The rear wheelhouse assembly 20 includes a wheelhouse outer panel 22 fixed with the flange 21. The wheelhouse outer panel 22 overlaps the outer side of the C-pillar 200.

[0047] The middle part of the rear floor front panel 30 is provided with an upwardly protruding seat mounting portion 31 and a middle channel 32. The seat mounting portion 31 is arranged close to the beam body 11 and is used to mount the rear seats (not shown) of the vehicle. The middle channel 32 abuts the side close to the vehicle head of the seat mounting portion 31 and extends along the length direction of the vehicle body to the rear floor front beam 50.

[0048] The seat mounting portion 31 is a downwardly open cavity structure. The seat mounting portion 31 is provided with a plurality of diamond-shaped reinforcements 311 and a connecting reinforcement 312. The plurality of diamond-shaped reinforcements 311 are arranged within the seat mounting portion 31 and close to the middle channel 32. The connecting reinforcement 312 connects the diamond-shaped reinforcements 311 and the triangular reinforcements 14.

[0049] The rear longitudinal beam 40 is arranged below the rear wheelhouse assembly 20. The rear longitudinal beam 40 is a cavity structure open to the side. A plurality of reinforcements 41 are arranged within the rear longitudinal beam 40. The reinforcements 41 can be X-shaped reinforcements, vertical reinforcements, triangular reinforcements or radial reinforcements, etc.

[0050] The rear floor front beam 50, the rear longitudinal beam 40 and the C-ring beam 10 form a ring-shaped force transmission path, and the force transmission structure is stable and has high torsional stiffness. The rear floor front beam 50 is a downwardly open cavity structure. A plurality of eight-shaped reinforcements 51 are arranged within the rear floor front beam 50 in sequence to improve the stiffness and strength of the rear floor front beam 50.

[0051] The rear floor rear cross beam 60, the rear longitudinal beam 40 and the C-ring cross beam 10 form a ring-shaped force transmission path, the force transmission structure is stable, and the torsional stiffness is high. The rear floor rear cross beam 60 and the C-ring cross beam 10 are hollow. The rear floor rear cross beam 60 is a downwardly open cavity structure. The rear floor rear cross beam 60 is provided with a strip-shaped reinforcing rib 61 and an inclined reinforcing rib 62. The strip-shaped reinforcing rib 61 extends along the length direction of the rear floor rear cross beam 60. The inclined reinforcing rib 62 is arranged at the joint of the rear floor rear cross beam 60 and the rear longitudinal beam 40 to improve the stiffness of the joint.

[0052] The shock absorber mounting point 70 includes a shock absorber front mounting point 71 and a shock absorber rear mounting point 72. The shock absorber front mounting point 71 is arranged on the front side of the front branch 121, and the shock absorber rear mounting point 72 is arranged between the front branch 121 and the rear branch 122. The transverse reinforcing rib 153 and the head reinforcing rib 154 arranged in the front branch 121 are connected with the shock absorber front mounting point 71 and the shock absorber rear mounting point 72. The transverse reinforcing rib 153 and the head reinforcing rib 154 arranged in the rear branch 122 are connected with the shock absorber rear mounting point 72. The reinforcing ribs are arranged around the shock absorber mounting point 70 to improve the dynamic stiffness of the shock absorber mounting point 70 and the support stiffness of the suspension system, and improve the NVH performance.

[0053] The rear bulkhead plate 300 is located above the rear part of the cross beam body 11. The rear bulkhead plate 300 includes a main plate 301 and a closed cavity 302 arranged below the front part of the main plate 301. The closed cavity 302 has a front side 303, a lower side (not shown) and a rear side (not shown). The main plate 301 is located on the upper side of the closed cavity 302, and the front side 303, the lower side, the rear side and part of the main plate 301 form the closed cavity 302, which is closed in the circumferential direction. The cross section of the closed cavity 302 is in the shape of a mouth. The closed cavity 302 extends in the width direction of the vehicle body, and its length is close to the length of the main plate 301.

[0054] Referring to Figure 9 As shown, the connecting piece 400 includes a convex part 401, a side turning edge 402 and a lower turning edge 403 arranged at the edge of the convex part 401. Part of the convex part 401 covers and overlaps the upper part of the front branch 121, and the remaining part of the convex part 401 overlaps the turning edge 21 and the C-pillar 200. The side turning edge 402 overlaps the C-pillar 200 and the turning edge 21. The lower turning edge 403 overlaps the upper part of the front branch 121 and the rear wheel cover assembly 20. When the connecting piece 400 overlaps the front branch 121, the turning edge 21 and the C-pillar 200, the overlapping parts are all double-layer structures, and the strength of the overlapping parts is high.

[0055] Referring to Figures 10-12As shown, the reinforcing assembly 500 comprises a front connecting plate 501, a lower connecting plate 502 and a rear connecting plate 503. The front connecting plate 501 is overlapped with the front side 303 and the rear branch 122. The rear connecting plate 503 is overlapped with the rear bulkhead 300 and the rear wheelhouse assembly 20. The lower connecting plate 502 is overlapped with the front connecting plate 501 and the rear connecting plate 503, and is also overlapped with the rear bulkhead 300, the rear branch 122 and the rear wheelhouse assembly 20. The main plate 301 connects the front connecting plate 501 and the rear connecting plate 503. Part of the main plate 301, the front connecting plate 501, the lower connecting plate 502 and the rear connecting plate 503 enclose a connecting chamber 504. The connecting chamber 504 is in communication with the closed chamber 302. The cross beam body 11 and the rear branch 122 are both cavity structures. The rear stiffness ring 102 is formed by the cavity of the cross beam body 11, the cavity of the rear branch 122, the connecting chamber 504 and the closed chamber 302. The rear stiffness ring 102 is a continuous cavity structure, which enhances the torsional stiffness and NVH performance of the rear body assembly.

[0056] The application also provides a vehicle comprising the rear body assembly described above.

[0057] The integrally formed rear floor assembly 100 of the application integrates the C-ring cross beam 10 and the rear wheelhouse assembly 20, reduces the number of parts and assembly processes, and reduces manufacturing costs. Meanwhile, the front branch 121 and the rear branch 122 extend from bottom to top and their upper parts are close to the flange 21 of the rear wheelhouse assembly 20. The front stiffness ring 101 and the rear stiffness ring 102 are formed by the connecting piece 400 and the reinforcing assembly 500 and the C-pillar 200 and the rear bulkhead 300, which improves the torsional stiffness of the vehicle body, the handling and stability performance of the vehicle and the NVH performance.

[0058] 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 conflict. The scope of protection of the application is not limited to the precise structures described in the above embodiments and shown in the drawings. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the application shall be included in the scope of protection of the application.

Claims

1. A rear body assembly characterized by, The rear floor assembly includes a C-ring cross beam and rear wheelhouse assemblies on both sides of the C-ring cross beam; the C-ring cross beam includes a cross beam body and C-ring branches on both sides of the cross beam body, the C-ring branches include front branches and rear branches extending from bottom to top along the rear wheelhouse assemblies, upper portions of the front branches and the rear branches are close to upper edges of the rear wheelhouse assemblies; the rear body assembly further includes a C-pillar and a rear bulkhead assembled on the rear floor assembly, upper portions of the front branches are close to the C-pillar, the front branches and the C-pillar are connected through a connecting piece which overlaps the front branches and the C-pillar, the rear bulkhead is above a rear portion of the cross beam body, the rear branches are arranged close to one side of the rear bulkhead, and the rear branches and the rear bulkhead are connected through a reinforcing assembly.

2. The rear body assembly of claim 1, wherein, The reinforcing assembly includes a front connecting plate, a lower connecting plate and a rear connecting plate, the front connecting plate overlaps the rear bulkhead and the rear branches, the rear connecting plate overlaps the rear bulkhead and the rear wheelhouse assembly, and the lower connecting plate overlaps the front connecting plate and the rear connecting plate.

3. The rear body assembly of claim 2, wherein, The rear bulkhead includes a main plate and a closed cavity arranged in front of the main plate, a front side of the closed cavity overlaps the front connecting plate.

4. The rear body assembly of claim 3, wherein, The front connecting plate, the lower connecting plate, the rear connecting plate and the main plate enclose a connecting cavity which communicates with the closed cavity.

5. The rear body assembly of claim 1, wherein, The front branches and the rear branches form an acute angle, and the front branches and the rear branches are connected by the rear wheelhouse assembly; edges of the rear wheelhouse assembly are provided with flanges which overlap the C-pillar.

6. The rear body assembly of claim 1, wherein, The cross beam body, the front branches and the rear branches are all cavity structures which are open downward; widths of the front branches gradually decrease from bottom to top, and widths of the rear branches gradually increase from bottom to top.

7. The rear body assembly of claim 1, wherein, The rear floor assembly further includes a rear floor front panel, a rear longitudinal beam, a rear floor front cross beam and a rear floor rear cross beam, the C-ring cross beam is between the rear floor front cross beam and the rear floor rear cross beam; a middle portion of the rear floor front panel is provided with a seat mounting portion which protrudes upward and a middle channel.

8. The rear body assembly of claim 1, wherein, The cross beam body is provided with X-shaped reinforcing ribs and triangular reinforcing ribs, the X-shaped reinforcing ribs are arranged at joints of the cross beam body and the C-ring branches, and the triangular reinforcing ribs are arranged at middle portions of the cross beam body.

9. The rear body assembly of claim 1, wherein, The front branches and the rear branches are provided with fishbone-shaped reinforcing ribs, the fishbone-shaped reinforcing ribs include main reinforcing ribs and a plurality of eight-shaped reinforcing ribs, and the main reinforcing ribs extend along length directions of the front branches and the rear branches.

10. The rear body assembly of claim 9, wherein, The rear body assembly further comprises a shock absorber front mounting point and a shock absorber rear mounting point, the shock absorber front mounting point is arranged on the front side of the front branch, and the shock absorber rear mounting point is arranged between the front branch and the rear branch; the front branch and the rear branch are provided with transverse reinforcing ribs arranged perpendicularly to the main reinforcing rib; the transverse reinforcing ribs are connected with the shock absorber front mounting point and the shock absorber rear mounting point, and the plurality of eight-shaped reinforcing ribs comprises a head reinforcing rib connected with the shock absorber front mounting point and the shock absorber rear mounting point.

11. A vehicle characterized by comprising: A vehicle comprising the rear body assembly according to any one of claims 1-10.

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