Vehicle body rear structure and vehicle

Abstract

This invention relates to a rear vehicle structure and a vehicle. The rear vehicle structure includes a roof rear crossbeam, a left side frame, a right side frame, a coat rack, and a rear floor crossbeam. The coat rack includes a coat rack body, a front coat rack crossbeam connected to the front of the coat rack body, and a rear coat rack crossbeam connected to the rear of the coat rack body. The roof rear crossbeam is located in front of the rear coat rack crossbeam, and the coat rack is positioned between the roof rear crossbeam and the rear floor crossbeam in the vehicle height direction. In this rear vehicle structure, all the annular force transmission frames are interconnected, forming a rear vehicle structure with continuous transmission paths for multiple annular force transmission frames, which greatly improves the overall vehicle's bending and torsional stiffness and modal characteristics.

Description

Technical Field

[0001] This invention belongs to the field of vehicle body technology, and in particular relates to a rear structure of a vehicle body and a vehicle. Background Technology

[0002] In existing vehicle body rear frames, vertical ring-shaped force transmission frame structures are generally constructed only at the C-pillar and / or D-pillar positions. These ring-shaped force transmission frames are few and discontinuous, resulting in poor bending and torsional stiffness and low modal performance of the entire vehicle. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide a rear body structure and vehicle that addresses the problem of poor bending stiffness and torsional stiffness of existing rear body frames.

[0004] To solve the above-mentioned technical problems, on the one hand, the present invention provides a rear structure of a vehicle body, including a rear crossbeam of the roof, a left side frame, a right side frame, a coat rack, and a crossbeam on the rear floor. The coat rack includes a coat rack body, a front crossbeam of the coat rack connected to the front side of the coat rack body, and a rear crossbeam of the coat rack connected to the rear side of the coat rack body. The rear crossbeam of the roof is located in front of the rear crossbeam of the coat rack, and the coat rack is located between the rear crossbeam of the roof and the crossbeam on the rear floor in the vehicle height direction.

[0005] The rear crossbeam of the top cover is connected between the upper side of the left side frame and the upper side of the right side frame; the front crossbeam of the coat rack is connected between the left side frame and the right side frame; the rear crossbeam of the coat rack is connected between the rear side of the left side frame and the rear side of the right side frame; and the rear floor crossbeam is connected between the lower side of the left side frame and the lower side of the right side frame.

[0006] The rear crossbeam of the top cover, the left side frame, the rear crossbeam of the coat rack, and the right side frame are connected in sequence to form a first annular force transmission frame; the front crossbeam of the coat rack, the left side frame, the rear crossbeam of the coat rack, and the right side frame are connected in sequence to form a second annular force transmission frame; the rear crossbeam of the top cover, the left side frame, the front crossbeam of the coat rack, and the right side frame are connected in sequence to form a third annular force transmission frame; the front crossbeam of the coat rack, the left side frame, the floor crossbeam, and the right side frame are connected in sequence to form a fourth annular force transmission frame.

[0007] Optionally, the left side enclosure includes a left side first column, a left side second column, a left wheel arch assembly, and a left upper beam connected to the upper ends of the left side first column and the left side second column; the right side enclosure includes a right side first column, a right side second column, a right wheel arch assembly, and a right upper beam connected to the upper ends of the right side first column and the right side second column; the left wheel arch assembly is connected to the lower end of the left side second column, and the right wheel arch assembly is connected to the lower end of the right side second column.

[0008] The left upper beam has a front section and a rear section, and the right upper beam has a front section and a rear section.

[0009] Optionally, the rear crossbeam of the top cover is connected between the front end of the rear section of the left upper beam and the front end of the rear section of the right upper beam; the front crossbeam of the coat rack is connected between the upper side of the left wheel arch assembly and the upper side of the right wheel arch assembly; the rear crossbeam of the coat rack is connected between the rear end of the rear section of the left upper beam and the rear end of the rear section of the right upper beam; and the rear floor crossbeam is connected between the lower side of the left wheel arch assembly and the lower side of the right wheel arch assembly.

[0010] The rear crossbeam of the top cover, the rear section of the left upper beam, the rear crossbeam of the coat rack, and the rear section of the right upper beam are connected in sequence to form the first annular force transmission frame; the front crossbeam of the coat rack, the second column of the left side, the rear crossbeam of the coat rack, and the second column of the right side are connected in sequence to form the second annular force transmission frame; the rear crossbeam of the top cover, the second column of the left side, the front crossbeam of the coat rack, and the second column of the right side are connected in sequence to form the third annular force transmission frame; the front crossbeam of the coat rack, the left wheel cover assembly, the crossbeam on the floor, and the right wheel cover assembly are connected in sequence to form the fourth annular force transmission frame.

[0011] Optionally, the left wheel arch assembly includes a left wheel arch and a left wheel arch support connected to the inside of the left wheel arch; the right wheel arch assembly includes a right wheel arch and a right wheel arch support connected to the inside of the right wheel arch; the front crossbeam of the coat rack is connected between the upper end of the left wheel arch support and the upper end of the right wheel arch support; and the floor crossbeam is connected between the lower end of the left wheel arch support and the lower end of the right wheel arch support.

[0012] The front crossbeam of the coat rack, the left wheel cover column, the floor crossbeam, and the right wheel cover column are connected in sequence to form the fourth annular force transmission frame.

[0013] Optionally, the floor beam includes a floor beam body, a first connector, and a second connector. The floor beam body is connected between the left wheel cover and the right wheel cover. The first connector is connected between the left end of the floor beam body and the lower end of the left wheel cover column. The second connector is connected between the right end of the floor beam body and the lower end of the right wheel cover column.

[0014] Optionally, the upper end of the left wheel cover column extends a first crossbeam toward the front crossbeam of the coat rack, and the first crossbeam is connected to the left end of the front crossbeam of the coat rack.

[0015] The upper end of the right wheel cover column extends toward the front crossbeam of the coat rack to form a second crossbeam, which is connected to the right end of the front crossbeam of the coat rack.

[0016] Optionally, a first window is provided between the first column and the second column of the left side enclosure; it also includes a first longitudinal beam, which connects the first column and the second column of the left side enclosure and spans the first window;

[0017] A second window is provided between the first column of the right side enclosure and the second column of the right side enclosure; it also includes a second longitudinal beam, which connects the second column of the left side enclosure and the second column of the right side enclosure and spans the second window.

[0018] Optionally, it also includes a front crossbeam of the top cover, which connects the front section of the left upper beam and the front section of the right upper beam. The front crossbeam, the left upper beam, the rear crossbeam, and the right upper beam enclose an installation area.

[0019] Optionally, the front crossbeam of the top cover, the upper left side beam, the upper right side beam, the rear crossbeam of the coat rack, and the rear crossbeam of the top cover constitute a fifth annular force transmission frame.

[0020] Optionally, the rear crossbeam of the top cover, the second column on the left side, the crossbeam on the floor, the second column on the right side, and the front crossbeam of the coat rack constitute a sixth annular force transmission frame.

[0021] Optionally, the main body of the coat rack is stepped, and the main body of the coat rack includes a front side panel, a first top panel, a middle side panel and a second top panel. The first top panel is connected between the upper side of the front side panel and the lower side of the middle side panel. The front side of the second top panel is connected to the upper side of the middle side panel. The front crossbeam of the coat rack is connected to the rear side of the front side panel and the lower side of the first top panel. The rear crossbeam of the coat rack is connected to the rear side of the second top panel.

[0022] In the rear structure of the vehicle body of this embodiment, the rear crossbeam of the roof, the left side frame, the rear crossbeam of the coat rack, and the right side frame are connected in sequence to form a first annular force transmission frame; the front crossbeam of the coat rack, the left side frame, the rear crossbeam of the coat rack, and the right side frame are connected in sequence to form a second annular force transmission frame; the rear crossbeam of the roof, the left side frame, the front crossbeam of the coat rack, and the right side frame are connected in sequence to form a third annular force transmission frame; and the front crossbeam of the coat rack, the left side frame, the floor crossbeam, and the right side frame are connected in sequence to form a fourth annular force transmission frame. The first and second annular force transmission frames intersect at the rear crossbeam of the coat rack, the first and third annular force transmission frames intersect at the rear crossbeam of the roof, and the second, third, and fourth annular force transmission frames intersect at the front crossbeam of the coat rack. All the annular force transmission frames are connected to each other, forming a continuous rear structure of the vehicle body with multiple annular force transmission paths. This greatly improves the bending and torsional stiffness and modal characteristics of the entire vehicle, can fully decompose and absorb the excitation generated by the rear shock absorber, effectively reduce noise and vibration at the rear of the vehicle body, improve ride comfort, and quickly respond to chassis handling performance.

[0023] Based on simulation analysis, compared with a certain model of the same class, the vehicle using the rear body structure of this application shows significant improvements in overall vehicle bending stiffness, torsional stiffness, and modal characteristics. The torsional stiffness reaches 25600 Nm / °, with a performance improvement of 25%, bending stiffness performance is improved by 20%, NVH performance is improved by 50%, modal characteristics are improved by 10%, subframe mounting point stiffness is improved by 20%, the vehicle body achieves a weight reduction of about 10 kg, and saves about 200 yuan in costs.

[0024] In addition, in terms of safety, with only two top cover crossbeams (front top cover crossbeam and rear top cover crossbeam), it can meet the CIASI requirements for excellent (G) performance in top pressure, side impact, and small offset impact.

[0025] On the other hand, embodiments of the present invention also provide a vehicle that includes the aforementioned rear body structure. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the rear structure of a vehicle body provided in an embodiment of the present invention;

[0027] Figure 2 This is a schematic diagram of the left side frame of the rear structure of a vehicle body provided in an embodiment of the present invention;

[0028] Figure 3 This is a schematic diagram of the right side frame of the rear structure of a vehicle body provided in an embodiment of the present invention;

[0029] Figure 4 This is a schematic diagram of a coat rack for the rear structure of a vehicle body according to an embodiment of the present invention;

[0030] Figure 5 This is a schematic diagram of the rear crossbeam of the roof of the vehicle body structure provided in an embodiment of the present invention;

[0031] Figure 6 This is a schematic diagram of the front crossbeam of the roof of the rear structure of the vehicle body provided in an embodiment of the present invention;

[0032] Figure 7 This is a schematic diagram of the floor crossbeam of the rear structure of a vehicle body provided in an embodiment of the present invention.

[0033] The reference numerals in the accompanying drawings are as follows:

[0034] R1, First annular force transmission frame; R2, Second annular force transmission frame; R3, Third annular force transmission frame; R4, Fourth annular force transmission frame; D, Installation area;

[0035] 1. Rear crossbeam of the roof;

[0036] 2. Left side perimeter frame; 21. First column of left side perimeter; 22. Second column of left side perimeter; 23. Left wheel cover assembly; 231. Left wheel cover; 24. Upper left side beam; 241. Front section of upper left side beam; 242. Rear section of upper left side beam; 25. First window; 26. First longitudinal beam;

[0037] 3. Right side enclosure frame; 31. First column of right side enclosure; 32. Second column of right side enclosure; 33. Right wheel cover assembly; 331. Right wheel cover; 332. Right wheel cover column; 3321. Second crossbeam; 34. Upper right side beam; 341. Front section of upper right side beam; 342. Rear section of upper right side beam; 35. Second window; 36. Second longitudinal beam;

[0038] 4. Coat rack; 41. Coat rack body; 411. Front side panel; 412. First top panel; 413. Middle side panel; 414. Second top panel; 42. Front crossbeam of the coat rack; 43. Rear crossbeam of the coat rack;

[0039] 5. Rear floor crossbeam; 51. Main body of the floor crossbeam; 52. First connector; 53. Second connector;

[0040] 6. Front crossbeam of the roof. Detailed Implementation

[0041] To make the technical problems solved, the technical solutions, and the beneficial effects of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

[0042] In this article, front, back, left, right, up, and down refer to the orientation of the vehicle when it is placed horizontally. The width direction is the left-right direction (Y direction), the height direction is the up-down direction (Z direction), and the length direction is the front-back direction (X direction).

[0043] See Figures 1 to 7 The rear structure of the vehicle body provided in this embodiment of the invention includes a rear crossbeam 1 of the roof, a left side frame 2, a right side frame 3, a coat rack 4, and a rear floor crossbeam 5. The coat rack 4 includes a coat rack body 41, a front coat rack crossbeam 42 connected to the front side of the coat rack body 41, and a rear coat rack crossbeam 43 connected to the rear side of the coat rack body 41. The rear crossbeam 1 of the roof is located in front of the rear coat rack crossbeam 43, and the coat rack 4 is located between the rear crossbeam 1 of the roof and the rear floor crossbeam 5 in the vehicle height direction.

[0044] The rear crossbeam 1 of the top cover connects to the upper side of the left side frame 2 and the upper side of the right side frame 3. The front crossbeam 42 of the coat rack connects to the left side frame 2 and the right side frame 3. The rear crossbeam 43 of the coat rack connects to the rear side of the left side frame 2 and the rear side of the right side frame 3. The rear floor crossbeam 5 connects to the lower side of the left side frame 2 and the lower side of the right side frame 3. The rear floor crossbeam 5 is suitable for welding to the rear floor.

[0045] See Figure 1 The rear crossbeam 1 of the top cover, the left side frame 2, the rear crossbeam 43 of the coat rack, and the right side frame 3 are connected in sequence to form a first annular force transmission frame R1; the front crossbeam 42 of the coat rack, the left side frame 2, the rear crossbeam 43 of the coat rack, and the right side frame 3 are connected in sequence to form a second annular force transmission frame R2; the rear crossbeam 1 of the top cover, the left side frame 2, the front crossbeam 42 of the coat rack, and the right side frame 3 are connected in sequence to form a third annular force transmission frame R3; the front crossbeam 42 of the coat rack, the left side frame 2, the floor crossbeam 5, and the right side frame 3 are connected in sequence to form a fourth annular force transmission frame R4.

[0046] The first annular force transmission frame R1 gradually tilts downwards from front to back, playing a role in resisting lateral sway in the Z direction.

[0047] The second ring-shaped force transmission frame R2 is roughly parallel to the horizontal plane or forms a small angle with it, which plays a role in resisting lateral sway in the Z direction.

[0048] The third annular force transmission frame R3 is approximately parallel to the vertical plane or forms a small angle with it, serving as a torsional resisting element in the Y direction.

[0049] The fourth annular force transmission frame R4 is approximately parallel to or at a small angle to the vertical plane.

[0050] In one embodiment, see Figures 1 to 3 The left side frame 2 includes a left side first column 21, a left side second column 22, a left wheel cover assembly 23, and a left upper beam 24 connecting the upper ends of the left side first column 21 and the left side second column 22. The right side frame 3 includes a right side first column 31, a right side second column 32, a right wheel cover assembly 33, and a right upper beam 34 connecting the upper ends of the right side first column 31 and the right side second column 32. The left wheel cover assembly 23 is connected to the lower end of the left side second column 22, and the right wheel cover assembly 33 is connected to the lower end of the right side second column 32. The left upper beam 24 has a front section 241 and a rear section 242, and the right upper beam 34 has a front section 341 and a rear section 342.

[0051] In one embodiment, see Figures 1 to 3 The rear crossbeam 1 of the top cover is connected between the front end of the rear section 242 of the left upper side beam and the front end of the rear section 342 of the right upper side beam. The front crossbeam 42 of the coat rack is connected between the upper side of the left wheel cover assembly 23 and the upper side of the right wheel cover assembly 33. The rear crossbeam 43 of the coat rack is connected between the rear end of the rear section 242 of the left upper side beam and the rear end of the rear section 342 of the right upper side beam. The rear floor crossbeam 5 is connected between the lower side of the left wheel cover assembly 23 and the lower side of the right wheel cover assembly 33. Thus, the rear crossbeam 1 of the top cover, the rear section 242 of the left upper beam, the rear crossbeam 43 of the coat rack, and the rear section 342 of the right upper beam are connected in sequence to form the first annular force transmission frame R1; the front crossbeam 42 of the coat rack, the second column 22 of the left side, the rear crossbeam 43 of the coat rack, and the second column 32 of the right side are connected in sequence to form the second annular force transmission frame; the rear crossbeam 1 of the top cover, the second column 22 of the left side, the front crossbeam 32 of the coat rack, and the second column 32 of the right side are connected in sequence to form the third annular force transmission frame R3; the front crossbeam 42 of the coat rack, the left wheel cover assembly 23, the floor crossbeam 5, and the right wheel cover assembly 24 are connected in sequence to form the fourth annular force transmission frame R4.

[0052] In one embodiment, see Figures 1 to 3The left wheel cover assembly 23 includes a left wheel cover 231 and a left wheel cover column (not visible in the figure) connected to the inside of the left wheel cover 231. The right wheel cover assembly 33 includes a right wheel cover 331 and a right wheel cover column 332 connected to the inside of the right wheel cover 331. The front crossbeam 42 of the coat rack is connected between the upper end of the left wheel cover column and the upper end of the right wheel cover column 332. The floor crossbeam 5 is connected between the lower end of the left wheel cover column and the lower end of the right wheel cover column 332. The front crossbeam 42 of the coat rack, the left wheel cover column, the floor crossbeam 5, and the right wheel cover column 332 are connected sequentially to form the fourth annular force transmission frame R4. The left wheel arch pillar serves as a reinforcement for the left wheel arch 231. Thus, in the event of a collision involving the left wheel arch 231, the impact force is transmitted through the left wheel arch pillar to the fourth annular force transmission frame R4, and then dispersed from the fourth annular force transmission frame R4 to the first annular force transmission frame R1, the second annular force transmission frame R2, and the first annular force transmission frame R3. This ensures even force distribution across the entire rear of the vehicle, preventing excessive intrusion into the passenger compartment. Similarly, the right wheel arch pillar 332 serves as a reinforcement for the left wheel arch 331. In the event of a collision involving the right wheel arch 331, the impact force is transmitted through the right wheel arch pillar 332 to the fourth annular force transmission frame R4, and then dispersed from the fourth annular force transmission frame R4 to the first annular force transmission frame R1, the second annular force transmission frame R2, and the first annular force transmission frame R3. This ensures even force distribution across the entire rear of the vehicle, preventing excessive intrusion into the passenger compartment.

[0053] In one embodiment, see Figure 1 and Figure 7 The floor beam 5 includes a floor beam body 51, a first connector 52, and a second connector 53. The floor beam body 51 is connected between the left wheel arch 231 and the right wheel arch 331. The first connector 52 is connected between the left end of the floor beam body 51 and the lower end of the left wheel arch column. The second connector 53 is connected between the right end of the floor beam body 51 and the lower end of the right wheel arch column 332. This increases the connection area between the floor beam 5 and the left wheel arch assembly 23, and also increases the connection area between the floor beam 5 and the right wheel arch assembly 33, thereby increasing the connection strength between the floor beam 5 and the left wheel arch assembly 23 and the right wheel arch assembly 33.

[0054] In one embodiment, the upper end of the left wheel cover post extends towards the front crossbeam 42 of the coat rack, forming a first crossbeam (not visible in the figure), which connects to the left end of the front crossbeam 42 of the coat rack. See also Figure 1 and Figure 3 The upper end of the right wheel cover column 332 extends toward the front crossbeam 42 of the coat rack to form a second crossbeam 3321, which is connected to the right end of the front crossbeam 42 of the coat rack.

[0055] In one embodiment, see Figure 1 and Figure 2 A first window 25 (commonly referred to as a triangular window) is provided between the first left side pillar 21 and the second left side pillar 22; a first longitudinal beam 26 is further included, and the first longitudinal beam 26 is connected between the first left side pillar 21 and the second left side pillar 22 and spans across the first window 25. The strength at the first window 25 is strengthened through the first longitudinal beam 26, and the strength of the left side frame 2 is enhanced.

[0056] In one embodiment, referring to Figure 3 a second window 35 is provided between the first right side pillar 31 and the second right side pillar 32; a second longitudinal beam 36 is further included, and the second longitudinal beam 36 is connected between the first right side pillar 31 and the second right side pillar 32 and spans across the second window 35. The strength at the second window 35 is strengthened through the second longitudinal beam 36, and the strength of the right side frame 3 is enhanced.

[0057] In one embodiment, referring to Figure 1 a front roof cross beam 6 is further included, and the front roof cross beam 6 is connected between the front section 241 of the left upper side beam and the front section 341 of the right upper side beam. The front roof cross beam 6, the left upper side beam 24, the rear roof cross beam 1 and the right upper side beam 34 enclose an installation area D suitable for installing a panoramic sunroof. In this way, the configuration of the panoramic sunroof can be achieved, the skylight opening is relatively large, the field of vision is wide, and the experience is good.

[0058] In one embodiment, referring to Figure 5 the rear roof cross beam 1 is a beam with a closed cross section, and the inside of the rear roof cross beam 1 has an inner cavity. Compared with the existing open-type roof cross beam, the rigidity and strength are greater, and it is not easy to bend during a collision. Both ends in the length direction of the rear roof cross beam 1 have flanges for welding with the left upper side beam 24 and the right upper side beam 34.

[0059] In one embodiment, referring to Figure 6 the front roof cross beam 6 is a beam with a closed cross section, and the inside of the front roof cross beam 6 has an inner cavity. Compared with the existing open-type roof cross beam, the rigidity and strength are greater, and it is not easy to bend during a collision. Both ends in the length direction of the front roof cross beam 6 have flanges for welding with the left upper side beam 24 and the right upper side beam 34.

[0060] In one embodiment, referring to Figure 1 the front roof cross beam 6, the left upper side beam 24, the right upper side beam 34, the rear cross beam 43 of the coat rack and the rear roof cross beam 1 form a fifth annular force transmission frame R5. The fifth annular force transmission frame R5 is in the shape of a "day" character and plays a role in resisting bending and torsion in the X, Y, and Z directions.

[0061] In one embodiment, referring to Figure 1, the rear cross member 1 of the roof is located behind the second row of seats in the X direction, so that the rear cross member 1 of the roof is far from the heads of the second row of occupants, and the head space of the second row of occupants is sufficient, resulting in high riding comfort.

[0062] In one embodiment, refer to Figure 1 , the rear cross member 1 of the roof, the second left side member 22, the upper floor cross member 5, the second right side member 32 and the front cross member 42 of the coat rack form the sixth annular force transmission frame R6. The sixth annular force transmission frame R6 is in the shape of a "day", which plays a role in Y-direction composite anti-torsion.

[0063] In one embodiment, refer to Figure 4 , the coat rack body 41 is in a stepped shape. The coat rack body 41 includes a front side plate 411, a first top plate 412, a middle side plate 413 and a second top plate 414. The first top plate 412 is connected between the upper side of the front side plate 411 and the lower side of the middle side plate 413. The front side of the second top plate 414 is connected to the upper side of the middle side plate 413. The front cross member 42 of the coat rack is connected to the rear side of the front side plate 411 and the lower side of the first top plate 412. The rear cross member 43 of the coat rack is connected to the rear side of the second top plate 414. The width of the second top plate 414 is larger and is used for placing items. The front cross member 42 of the coat rack is arranged behind the front side plate 411 of the coat rack body 41 to avoid occupying the space of the occupant compartment.

[0064] Of course, in some embodiments, the front side plate 411 and the first top plate 412 may also be part of the front cross member 42 of the coat rack.

[0065] In the rear body structure of the embodiment of the present invention, the left side frame 2, the right side frame 3, the coat rack 4, and the upper floor cross member 5 are assembled into a body frame sub-assembly through connection methods such as welding, screwing, and structural adhesive. This body frame sub-assembly is then assembled with the rear cross member 1 of the roof and the front cross member 6 of the roof through welding and screwing to form the rear body structure.

[0066] For the rear body structure of the embodiment of the present invention, refer to Figure 1The left-side perimeter frame has seven nodes: P1, P2, P3, P4, P5, and P7. Node P1 connects the first column 21 to the upper left beam 24; P2 connects the first column 21 to the first longitudinal beam 26; P3 connects the rear floor crossbeam to the left wheel arch assembly 23; P4 connects the rear roof crossbeam 1 to the upper left beam 24; P5 connects the second column 22 to the second longitudinal beam 26; P6 connects the front crossbeam 42 of the coat rack to the second column 22 of the right side perimeter; and P7 connects the rear crossbeam 43 of the coat rack to the upper left beam 24. The right-side perimeter frame 3 also has seven nodes, symmetrically arranged to the left and right sides of the seven nodes on the left-side perimeter frame 2.

[0067] At each node, welded joints are used for reinforcement, which strengthens the overall rear structure of the vehicle body and improves its structural stability. A joint refers to two components welded together by overlapping or nesting, with the corresponding beam having an internal cavity (force transmission cavity).

[0068] In the rear structure of the vehicle body of this embodiment, the first annular force transmission frame R1 and the second annular force transmission frame R2 intersect at the rear crossbeam 43 of the coat rack (the rear crossbeam 43 of the coat rack is a shared component of the first annular force transmission frame R1 and the second annular force transmission frame R2), the first annular force transmission frame R1 and the third annular force transmission frame R3 intersect at the rear crossbeam 1 of the roof (the rear crossbeam 1 of the roof is a shared component of the first annular force transmission frame R1 and the third annular force transmission frame R3), and the second annular force transmission frame R2, the third annular force transmission frame R3 and the fourth annular force transmission frame R2... The force transmission frame R4 intersects with the front crossbeam 42 of the coat rack (the front crossbeam 42 of the coat rack is a shared component of the second ring force transmission frame R2, the third ring force transmission frame R3, and the fourth ring force transmission frame R4). All the ring force transmission frames are connected to each other, forming a continuous transmission path of multiple ring force transmission frames in the rear structure of the vehicle body. This greatly improves the bending and torsional stiffness and modal characteristics of the whole vehicle, can fully decompose and absorb the excitation generated by the rear shock absorber, effectively reduce the noise and vibration of the rear of the vehicle body, improve ride comfort, and quickly respond to chassis handling performance.

[0069] Based on simulation analysis, compared with a certain model of the same class, the vehicle with the rear body structure of this application shows significant improvements in overall vehicle bending stiffness, torsional stiffness and modal characteristics. The torsional stiffness reaches 25600 Nm / °, with a performance improvement of 25%, bending stiffness performance is improved by 20%, NVH performance is improved by 50%, modal characteristics are improved by 10%, subframe mounting point stiffness is improved by 20%, the vehicle body weight is reduced by about 10 kg, and the cost is reduced by about 200 yuan.

[0070] In addition, in terms of safety, with only two top cover crossbeams (top cover front crossbeam 6 and top cover rear crossbeam 1), it can meet the CIASI requirements for excellent (G) performance in top pressure, side impact, and small offset impact.

[0071] In addition, this invention also provides a vehicle that includes the rear body structure described in the above embodiments.

[0072] In one embodiment, the vehicle is a sedan, particularly a sedan with a large panoramic sunroof.

[0073] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A rear structure of a vehicle body, characterized in that, It includes a rear crossbeam of the top cover, a left side frame, a right side frame, a coat rack, and a crossbeam on the rear floor. The coat rack includes a coat rack body, a front crossbeam of the coat rack connected to the front side of the coat rack body, and a rear crossbeam of the coat rack connected to the rear side of the coat rack body. The rear crossbeam of the top cover is located in front of the rear crossbeam of the coat rack, and the coat rack is located between the rear crossbeam of the top cover and the crossbeam on the rear floor in the vehicle height direction. The rear crossbeam of the top cover is connected between the upper side of the left side frame and the upper side of the right side frame; the front crossbeam of the coat rack is connected between the left side frame and the right side frame; the rear crossbeam of the coat rack is connected between the rear side of the left side frame and the rear side of the right side frame; and the rear floor crossbeam is connected between the lower side of the left side frame and the lower side of the right side frame. The rear crossbeam of the top cover, the left side frame, the rear crossbeam of the coat rack, and the right side frame are connected in sequence to form a first annular force transmission frame; the front crossbeam of the coat rack, the left side frame, the rear crossbeam of the coat rack, and the right side frame are connected in sequence to form a second annular force transmission frame; the rear crossbeam of the top cover, the left side frame, the front crossbeam of the coat rack, and the right side frame are connected in sequence to form a third annular force transmission frame; the front crossbeam of the coat rack, the left side frame, the floor crossbeam, and the right side frame are connected in sequence to form a fourth annular force transmission frame.

2. The rear structure of the vehicle body according to claim 1, characterized in that, The left side enclosure includes a first left side pillar, a second left side pillar, a left wheel arch assembly, and a left upper beam connecting the upper ends of the first left side pillar and the second left side pillar. The right side enclosure includes a first right side pillar, a second right side pillar, a right wheel arch assembly, and a right upper beam connecting the upper ends of the first right side pillar and the second right side pillar. The left wheel arch assembly is connected to the lower end of the second left side pillar, and the right wheel arch assembly is connected to the lower end of the second right side pillar. The left upper beam has a front section and a rear section, and the right upper beam has a front section and a rear section.

3. The rear structure of the vehicle body according to claim 2, characterized in that, The rear crossbeam of the top cover is connected between the front end of the rear section of the left upper beam and the front end of the rear section of the right upper beam. The front crossbeam of the coat rack is connected between the upper side of the left wheel cover assembly and the upper side of the right wheel cover assembly. The rear crossbeam of the coat rack is connected between the rear end of the rear section of the left upper beam and the rear end of the rear section of the right upper beam. The rear floor crossbeam is connected between the lower side of the left wheel cover assembly and the lower side of the right wheel cover assembly. The rear crossbeam of the top cover, the rear section of the left upper beam, the rear crossbeam of the coat rack, and the rear section of the right upper beam are connected in sequence to form the first annular force transmission frame; the front crossbeam of the coat rack, the second column of the left side, the rear crossbeam of the coat rack, and the second column of the right side are connected in sequence to form the second annular force transmission frame; the rear crossbeam of the top cover, the second column of the left side, the front crossbeam of the coat rack, and the second column of the right side are connected in sequence to form the third annular force transmission frame; the front crossbeam of the coat rack, the left wheel cover assembly, the crossbeam on the floor, and the right wheel cover assembly are connected in sequence to form the fourth annular force transmission frame.

4. The rear structure of the vehicle body according to claim 2, characterized in that, The left wheel arch assembly includes a left wheel arch and a left wheel arch support connected to the inside of the left wheel arch; the right wheel arch assembly includes a right wheel arch and a right wheel arch support connected to the inside of the right wheel arch; the front crossbeam of the coat rack is connected between the upper end of the left wheel arch support and the upper end of the right wheel arch support; the floor crossbeam is connected between the lower end of the left wheel arch support and the lower end of the right wheel arch support. The front crossbeam of the coat rack, the left wheel cover column, the floor crossbeam, and the right wheel cover column are connected in sequence to form the fourth annular force transmission frame.

5. The rear structure of the vehicle body according to claim 4, characterized in that, The floor beam includes a floor beam body, a first connector and a second connector. The floor beam body is connected between the left wheel cover and the right wheel cover. The first connector is connected between the left end of the floor beam body and the lower end of the left wheel cover column. The second connector is connected between the right end of the floor beam body and the lower end of the right wheel cover column.

6. The rear structure of the vehicle body according to claim 4, characterized in that, The upper end of the left wheel cover column extends toward the front crossbeam of the coat rack, and the first crossbeam is connected to the left end of the front crossbeam of the coat rack. The upper end of the right wheel cover column extends toward the front crossbeam of the coat rack to form a second crossbeam, which is connected to the right end of the front crossbeam of the coat rack.

7. The rear structure of the vehicle body according to claim 2, characterized in that, A first window is provided between the first column and the second column of the left side enclosure; it also includes a first longitudinal beam, which connects the first column and the second column of the left side enclosure and spans the first window; A second window is provided between the first column of the right side enclosure and the second column of the right side enclosure; it also includes a second longitudinal beam, which connects the second column of the left side enclosure and the second column of the right side enclosure and spans the second window.

8. The rear structure of the vehicle body according to claim 2, characterized in that, It also includes a front crossbeam of the top cover, which connects the front section of the left upper beam and the front section of the right upper beam. The front crossbeam, the left upper beam, the rear crossbeam, and the right upper beam together form an installation area.

9. The rear structure of the vehicle body according to claim 8, characterized in that, The front crossbeam of the top cover, the upper left side beam, the upper right side beam, the rear crossbeam of the coat rack, and the rear crossbeam of the top cover constitute the fifth annular force transmission frame.

10. The rear structure of the vehicle body according to claim 2, characterized in that, The rear crossbeam of the roof, the second column on the left side, the crossbeam on the floor, the second column on the right side, and the front crossbeam of the coat rack constitute the sixth ring-shaped force transmission frame.

11. The rear structure of the vehicle body according to any one of claims 1-10, characterized in that, The main body of the coat rack is stepped, and includes a front side panel, a first top panel, a middle side panel, and a second top panel. The first top panel is connected between the upper side of the front side panel and the lower side of the middle side panel. The front side of the second top panel is connected to the upper side of the middle side panel. The front crossbeam of the coat rack is connected to the rear side of the front side panel and the lower side of the first top panel. The rear crossbeam of the coat rack is connected to the rear side of the second top panel.

12. A vehicle, characterized in that, Includes the rear body structure as described in any one of claims 1-11.

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