Vehicle body rear structure

Abstract

The invention belongs to the technical field of automobiles, and provides an automobile body rear structure which comprises a connecting plate, a side wall inner plate assembly and a rear floor assembly, and a C column inner plate reinforcing plate, a C column inner plate supporting plate, a first wheel cover reinforcing plate, a second wheel cover reinforcing plate and a CD column connecting plate are fixedly connected to the first surface of the connecting plate; a shock absorber reinforcing plate is arranged on the connecting plate, the upper surface of the shock absorber reinforcing plate is fixedly connected with the lower end face of a C column inner plate supporting plate and the lower end face of a CD column connecting plate, and the upper end face of the C column inner plate supporting plate is fixedly connected with the lower end face of a C column inner plate reinforcing plate. One end, far away from the shock absorber reinforcing plate, of the C column inner plate reinforcing plate and one end, far away from the shock absorber reinforcing plate, of the CD column connecting plate are fixedly connected with the side wall inner plate assembly; the C column inner plate reinforcing plate is connected with the side wall inner plate assembly, so that force can be conveniently and directly transmitted to the first top beam connecting plate of the side wall inner plate assembly, the internal force transmission path of a C ring is complete, and the torsional rigidity of a vehicle body is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of automobiles, and in particular relates to a rear structure of a vehicle body. Background Art

[0002] The torsional stiffness of a car refers to the ability of the car body to resist elastic deformation when subjected to external forces. It is an important indicator for measuring the structural strength of the car body. Generally, cars use ring structures to improve the torsional stiffness of the car body. The car C-ring refers to a ring-shaped structure located near the C-pillar at the rear of the car body. It is composed of multiple components and has a significant impact on the torsional stiffness, safety, and NVH performance (noise, vibration and comfort) of the car body.

[0003] In the existing technology, the upper end of the reinforcement plate on the inner panel of the rear wheel arch of the C-pillar ends at the rear waistline of the vehicle body, and is not connected to the rear top crossbeam upwards, nor is it connected to the D-pillar backwards. As a result, when the C-ring is transmitting force, the force of the crossbeam on the floor cannot continue to be transmitted to the rear top crossbeam and D-pillar, resulting in an incomplete force transmission path inside the C-ring, affecting the torsional stiffness of the vehicle body.

[0004] Therefore, a rear vehicle body structure with a complete force transmission path is required. Summary of the Invention

[0005] In response to the above problems, the present invention proposes a vehicle body rear structure, comprising a connecting plate, a side panel inner panel assembly and a rear floor assembly, wherein a C-pillar inner panel reinforcement plate, a C-pillar inner panel support plate, a first wheelhouse reinforcement plate, a second wheelhouse reinforcement plate and a CD-pillar connecting plate are fixedly connected to a first surface of the connecting plate, a shock absorber reinforcement plate is provided on the connecting plate, an upper surface of the shock absorber reinforcement plate is fixedly connected to a lower end surface of the C-pillar inner panel support plate and a lower end surface of the CD-pillar connecting plate, an upper end surface of the C-pillar inner panel support plate is fixedly connected to a lower end surface of the C-pillar inner panel reinforcement plate, and an end of the C-pillar inner panel reinforcement plate and the CD-pillar connecting plate away from the shock absorber reinforcement plate is fixedly connected to the side panel inner panel assembly; The lower surface of the shock absorber reinforcement plate is fixedly connected to the upper end surface of the second wheel house reinforcement plate and the upper end surface of the first wheel house reinforcement plate. The first wheel house reinforcement plate and the second wheel house reinforcement plate are fixedly connected to the rear floor assembly at one end away from the shock absorber reinforcement plate. The two ends of the connecting plate are respectively fixedly connected to the side inner panel assembly and the rear floor assembly.

[0006] Furthermore, the C-pillar inner panel support plate, the CD-pillar connecting plate, the first wheel house reinforcement plate and the second wheel house reinforcement plate are connected through the shock absorber reinforcement plate to form an "X" shape.

[0007] Further, the connecting plate includes an inner wheelhouse panel, a C-column inner panel, and an outer wheelhouse panel. Both ends of the C-column inner panel are fixedly connected to the side inner panel assembly and the shock absorber reinforcement plate respectively. The first surface of the C-column inner panel is fixedly connected to the C-column inner panel reinforcement plate, the C-column inner panel support plate, and the CD-column connecting plate. The inner wheelhouse panel and the outer wheelhouse panel are fixedly connected, and both the upper ends of the inner wheelhouse panel and the outer wheelhouse panel are fixedly connected to the shock absorber reinforcement plate. One side of the inner wheelhouse panel away from the outer wheelhouse panel is fixedly connected to the first wheelhouse reinforcement plate, the second wheelhouse reinforcement plate, and the rear floor assembly.

[0008] Further, the rear body structure further includes a first C-column reinforcement plate. The first C-column reinforcement plate is fixedly installed on one side of the C-column inner panel away from the C-column inner panel reinforcement plate. The upper end of the first C-column reinforcement plate is fixedly connected to the side inner panel assembly, and the lower end is fixedly connected to the outer wheelhouse panel.

[0009] Further, the first C-column reinforcement plate, the C-column inner panel, and the C-column inner panel reinforcement plate form a "day" - shaped closed cavity.

[0010] Further, the rear body structure further includes a third wheelhouse reinforcement plate. The third wheelhouse reinforcement plate is fixedly installed on one side of the outer wheelhouse panel away from the first wheelhouse reinforcement plate. The upper end of the third wheelhouse reinforcement plate is fixedly connected to the shock absorber reinforcement plate, and the lower end is fixedly connected to the rear floor assembly.

[0011] Further, the side inner panel assembly includes a first roof beam connecting plate and a second roof beam connecting plate. The first roof beam connecting plate and the second roof beam connecting plate are installed opposite to each other to form a cavity, and the cavity has a first port, a second port, and a third port.

[0012] Further, the first port is connected to the D-column connecting plate, and the lower surface of the D-column connecting plate is fixedly connected to the upper end of the CD-column connecting plate.

[0013] Further, the second port is fixedly connected to both the C-column inner panel and the side beam reinforcement plate.

[0014] Further, the third port is fixedly connected to the rear roof cross beam reinforcement plate.

[0015] Beneficial effects: 1. In the present invention, by connecting the C-column inner panel reinforcement plate to the side inner panel assembly, it is convenient for the force to be directly transmitted to the first roof beam connecting plate of the side inner panel assembly, thereby realizing a complete force transmission path inside the C-ring and improving the torsional stiffness of the vehicle body.

[0016] 2. The C-pillar inner panel support plate, CD-pillar connecting plate, first wheel house reinforcement plate and second wheel house reinforcement plate of the rear structure of the vehicle body of the present invention are connected through the shock absorber reinforcement plate to form an "X" shape. With the shock absorber reinforcement plate as the center, there are two force transmission paths upward and two force transmission paths downward. In this way, the CD-pillar connecting plate, C-pillar inner panel reinforcement plate and C-pillar inner panel support plate, first wheel house reinforcement plate, second wheel house reinforcement plate, side inner panel assembly and rear floor assembly together form a spatial network ring structure, which effectively disperses the force transmitted to the vehicle body by the shock absorber, reduces stress concentration and improves the structural integrity of the vehicle body.

[0017] 3. When the side beam reinforcement plate of the rear vehicle body structure of the present invention is subjected to stress, the energy can be transferred through the side panel inner panel assembly to the rear top cross beam inner panel and the rear top cross beam reinforcement plate, and then to the D-pillar, and then to the rear panel cavity, and then to the right side panel, forming a complete ring structure.

[0018] Other features and advantages of the present invention will be described in the following description, and in part will become apparent from the description, or will be understood by practicing the present invention. The purpose and other advantages of the present invention can be realized and obtained by the structures pointed out in the description and the drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following is a brief introduction to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0020] Figure 1 A schematic diagram of the rear structure of a vehicle body in an embodiment of the present invention is shown.

[0021] Figure 2 A first exploded schematic diagram of the rear vehicle body structure according to an embodiment of the present invention is shown.

[0022] Figure 3 A second exploded schematic diagram of the rear vehicle body structure according to an embodiment of the present invention is shown.

[0023] Figure 4 A schematic diagram showing the connection between the rear roof beam inner plate and the rear roof beam reinforcement plate of the vehicle body rear structure in an embodiment of the present invention is shown.

[0024] Figure 5 A schematic diagram showing the connection between the C-pillar inner panel, the C-pillar inner panel reinforcement panel and the first C-pillar reinforcement panel of the vehicle body rear structure in an embodiment of the present invention is shown.

[0025] Figure 6A schematic diagram showing the connection between the second roof beam connecting plate and the D-pillar connecting plate, the rear roof cross beam reinforcement plate and the side beam reinforcement plate of the vehicle body rear structure in an embodiment of the present invention is shown.

[0026] Figure 7 A schematic diagram showing the connection of two groups of first top beam connecting plates and second top beam connecting plates of the rear structure of a vehicle body according to an embodiment of the present invention through a rear top cross beam reinforcement plate and a side beam reinforcement plate is shown.

[0027] In the figure, 1, side panel inner panel assembly; 11, D-pillar connecting plate; 12, first top beam connecting plate; 13, second top beam connecting plate; 14, first C-pillar reinforcement plate; 15, second C-pillar reinforcement plate; 2. Wheel house inner panel; 3. C-pillar inner panel; 4. C-pillar inner panel reinforcement plate; 5. C-pillar inner panel support plate; 6. Shock absorber reinforcement plate; 7. First wheel house reinforcement plate; 8. Wheel house outer panel; 9. Second wheel house reinforcement plate; 10. C-pillar connecting plate; 16. Third wheel house reinforcement plate; 17. Crossbeam connecting plate; 18. Crossbeam; 19. Longitudinal beam; 20. Rear top crossbeam inner panel; 21. Rear top crossbeam reinforcement plate; 22. Side beam reinforcement plate. DETAILED DESCRIPTION

[0028] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts shall fall within the scope of protection of the present invention.

[0029] refer to Figure 1 A vehicle body rear structure includes a connecting plate, a side inner panel assembly 1 and a rear floor assembly, a first surface (i.e., inner surface) of the connecting plate being fixedly connected with a C-pillar inner panel reinforcement plate 4, a C-pillar inner panel support plate 5, a first wheelhouse reinforcement plate 7, a second wheelhouse reinforcement plate 9 and a CD-pillar connecting plate 10, a shock absorber reinforcement plate 6 being provided on the connecting plate, an upper surface of the shock absorber reinforcement plate 6 being fixedly connected with a lower end surface of the C-pillar inner panel support plate 5 and a lower end surface of the CD-pillar connecting plate 10, an upper end surface of the C-pillar inner panel support plate 5 being fixedly connected with a lower end surface of the C-pillar inner panel reinforcement plate 4, the C-pillar inner panel reinforcement plate 4 and the C-pillar inner panel support plate 5 being V-shaped, and an end of the C-pillar inner panel reinforcement plate 4 and the CD-pillar connecting plate 10 away from the shock absorber reinforcement plate 6 being fixedly connected with the side inner panel assembly 1.

[0030] Furthermore, the lower surface of the shock absorber reinforcement plate 6 is fixedly connected to the upper end surface of the second wheel house reinforcement plate 9 and the upper end surface of the first wheel house reinforcement plate 7, the second wheel house reinforcement plate 9 and the first wheel house reinforcement plate 7 are V-shaped, and the ends of the first wheel house reinforcement plate 7 and the second wheel house reinforcement plate 9 away from the shock absorber reinforcement plate 6 are fixedly connected to the rear floor assembly, the first wheel house reinforcement plate 7 and the C-pillar inner panel support plate 5 are located on the same side, and the two ends of the connecting plate are respectively fixedly connected to the side inner panel assembly 1 and the rear floor assembly.

[0031] Specifically, the rear floor assembly includes a crossbeam connecting plate 17, a crossbeam 18, a longitudinal beam 19, and a rear floor body. The first wheelhouse reinforcement plate 7 is fixedly connected to the crossbeam connecting plate 17, and the crossbeam connecting plate 17 is fixedly connected to the crossbeam 18; the second wheelhouse reinforcement plate 9 is fixedly connected to the longitudinal beam 19, and the crossbeam 18 and the longitudinal beam 19 are both fixedly connected to the rear floor body (refer to Figure 2 ), the cross beam 18 and the longitudinal beam 19 are fixedly connected, and the cross beam 18 and the longitudinal beam 19 are L-shaped.

[0032] Specifically, the C-pillar inner panel reinforcement plate 4 and the C-pillar inner panel support plate 5 are in a "J"-shaped structure, and the two welding flanges in the middle are directly bonded and welded to the C-pillar inner panel 3. The lower end of the C-pillar inner panel support plate 5 is welded to the shock absorber reinforcement plate 6, and the upper end of the C-pillar inner panel reinforcement plate 4 is welded to the first top beam connecting plate 12. The C-pillar inner panel reinforcement plate 4, the C-pillar inner panel support plate 5, the shock absorber reinforcement plate 6, the C-pillar inner panel 3 and the first top beam connecting plate 12 form a closed cavity. At the same time, the welding edges of the C-pillar inner panel reinforcement plate 4, the C-pillar inner panel support plate 5 and the C-pillar inner panel 3 correspond to the welding edges of the first C-pillar reinforcement plate 14, so that the first C-pillar reinforcement plate 14 corresponds to the outer reinforcement plate cavity of the C-pillar inner panel reinforcement plate 4 and the C-pillar inner panel support plate 5 in the Y direction, which is equivalent to increasing the cross-sectional size, thereby increasing the cavity strength.

[0033] The first wheel arch reinforcement plate 7 is a U-shaped structure, with the lower end welded to the crossbeam connecting plate 17 and the upper end welded to the shock absorber reinforcement plate 6. At the same time, the welding edge is welded to the wheel arch inner plate 2 to form a closed cavity.

[0034] refer to Figure 1 The C-pillar inner panel support plate 5, the CD-pillar connecting plate 10, the first wheelhouse reinforcement plate 7 and the second wheelhouse reinforcement plate 9 are connected through the shock absorber reinforcement plate 6 to form an "X" shape.

[0035] Specifically, taking the shock absorber reinforcement plate 6 as the center, there are two force transmission paths upward, namely the CD pillar connecting plate 10 and the C pillar inner panel reinforcement plate 4, and there are also two force transmission paths downward, namely the second wheelhouse reinforcement plate 9 and the first wheelhouse reinforcement plate 7. In this way, the CD pillar connecting plate 10, the C pillar inner panel reinforcement plate 4, the C pillar inner panel support plate 5, the first wheelhouse reinforcement plate 7, the second wheelhouse reinforcement plate 9, the inner side panel assembly 1, and the rear floor assembly together form a spatial network ring structure, effectively dispersing the force transmitted by the shock absorber to the vehicle body, reducing stress concentration, and enhancing the integrity of the vehicle body structure.

[0036] In the implementation of the present invention, the connecting plate includes the inner wheelhouse panel 2, the C pillar inner panel 3, and the outer wheelhouse panel 8. The two ends of the C pillar inner panel 3 are respectively fixedly connected to the inner side panel assembly 1 and the shock absorber reinforcement plate 6. The first surface (inner surface) of the C pillar inner panel 3 is fixedly connected to the inner side panel assembly 1, the C pillar inner panel reinforcement plate 4, the C pillar inner panel support plate 5, and the CD pillar connecting plate 10; the inner wheelhouse panel 2 and the outer wheelhouse panel 8 are mutually adhered and fixedly connected, and the upper ends of the inner wheelhouse panel 2 and the outer wheelhouse panel 8 are fixedly connected to the shock absorber reinforcement plate 6; the first surface (the side away from the outer wheelhouse panel 8) of the inner wheelhouse panel 2 is fixedly connected to the first wheelhouse reinforcement plate 7, the second wheelhouse reinforcement plate 9, and the rear floor assembly.

[0037] Optionally, another implementation method is that the lower end of the second wheelhouse reinforcement plate 9 is welded to the longitudinal beam 19, the upper end is welded to the left CD pillar connecting plate 10, and the CD pillar connecting plate 10 is then welded to the D pillar connecting plate 11.

[0038] Reference Figure 2 The rear body structure further includes a first C pillar reinforcement plate 14. The first C pillar reinforcement plate 14 is fixedly installed on the side of the C pillar inner panel 3 away from the C pillar inner panel reinforcement plate 4. The upper end of the first C pillar reinforcement plate 14 is fixedly connected to the inner side panel assembly 1, and the lower end is fixedly connected to the outer wheelhouse panel 8.

[0039] Specifically, the first C pillar reinforcement plate 14 is in a "U" - shaped structure. The upper end part of the first C pillar reinforcement plate 14 is welded to the lower part of the second roof beam connecting plate 13, and the lower end part of the first C pillar reinforcement plate 14 is welded to the upper part of the second C pillar reinforcement plate 15 and the outer wheelhouse panel 8; the first C pillar reinforcement plate 14 is in a "U" - shaped structure, and the two welding flanges in the middle are directly surface - to - surface adhered and welded to the C pillar inner panel 3.

[0040] Reference Figure 5 The first C pillar reinforcement plate 14, the C pillar inner panel 3, and the C pillar inner panel reinforcement plate 4 form a "day" - shaped closed cavity. Specifically, at the same time, the two welding flanges of the first C pillar reinforcement plate 14 correspond to the two welding edges of the C pillar inner panel reinforcement plate 4. The two "U" - shaped structures plus the middle C pillar inner panel 3 form a "day - shaped" closed cavity, improving the strength.

[0041] Reference Figure 3, the rear body structure further includes a third wheelhouse reinforcement plate 16. The third wheelhouse reinforcement plate 16 is fixedly installed on the side of the outer wheelhouse panel 8 away from the first wheelhouse reinforcement plate 7. The upper end of the third wheelhouse reinforcement plate 16 is fixedly connected to the shock absorber reinforcement plate 6, and the lower end is fixedly connected to the rear floor assembly. Specifically, the third wheelhouse reinforcement plate 16 is in a "U" - shaped structure, the lower end is welded to the cross - beam connecting plate 17, and the upper end is welded to the shock absorber reinforcement plate 6 to form a closed cavity, and the welding edges correspond to those of the first wheelhouse reinforcement plate 7. The first wheelhouse reinforcement plate 7, the middle plate (the inner wheelhouse panel 2 and the outer wheelhouse panel 8), and the third wheelhouse reinforcement plate 16 form a "day" - shaped closed cavity, enhancing the strength.

[0042] Reference Figure 2 , the inner side - panel assembly 1 includes a first roof - beam connecting plate 12 and a second roof - beam connecting plate 13. The first roof - beam connecting plate 12 and the second roof - beam connecting plate 13 are installed opposite to each other to form a cavity, and the cavity has a first port, a second port, and a third port.

[0043] Specifically, the first roof - beam connecting plate 12 and the second roof - beam connecting plate 13 are installed opposite to each other to form a cavity (the welding edges of the second roof - beam connecting plate 13 and the first roof - beam connecting plate 12 are welded correspondingly to form a closed three - way cavity). The cavity has three connecting ports. Among them, the front port (the second port) is welded to the C - pillar inner panel 3 and the side - beam reinforcement plate 22 (the first roof - beam connecting plate 12 is welded to the C - pillar inner panel 3, and the second roof - beam connecting plate 13 is welded to the side - beam reinforcement plate 22), the rear port (the third port) is welded to the rear roof - cross - beam reinforcement plate 21, and the lower port (the first port) is welded to the D - pillar connecting plate 11.

[0044] Reference Figure 6 , the first port is connected to the D - pillar connecting plate 11, and the lower surface of the D - pillar connecting plate 11 is fixedly connected to the upper end of the CD - pillar connecting plate 10. Specifically, the D - pillar connecting plate 11 is in an L - shaped structure, and the upper end is connected to the first roof - beam connecting plate 12 and the second roof - beam connecting plate 13 by welding.

[0045] Furthermore, the second port is fixedly connected to both the C - pillar inner panel 3 and the side - beam reinforcement plate 22. Specifically, when the side - beam reinforcement plate 22 is stressed, the energy can be transmitted through the three - way structure (the first roof - beam connecting plate 12 and the second roof - beam connecting plate 13) to the rear roof - cross - beam inner panel 20 and the rear roof - cross - beam reinforcement plate 21, and then to the D - pillar, and then to the rear - enclosure cavity, and then to the right - hand side - panel, forming a complete ring - shaped structure.

[0046] Furthermore, the third port is fixedly connected to the rear roof - cross - beam reinforcement plate 21. Specifically, the rear roof - cross - beam assembly includes a rear roof - cross - beam inner panel 20 and a rear roof - cross - beam reinforcement plate 21 (Reference Figure 4), the rear top cross beam inner plate 20 and the rear top cross beam reinforcement plate 21 both form an L-shaped cross-section structure, and the rear top cross beam inner plate 20 and the rear top cross beam reinforcement plate 21 are welded through the upper and lower overlapping edges to form a closed-section beam rear top cross beam assembly. The rear top cross beam assembly has two ends, namely the left end connection part and the right end connection part. The rear top cross beam reinforcement plate 21 of the left end connection part is connected to the second top beam connection plate 13 on the left side by welding, and the rear top cross beam inner plate 20 of the left end connection part is connected to the first top beam connection plate 12 on the left side by welding. The rear top cross beam reinforcement plate 21 of the right end connection part is connected to the second top beam connection plate 13 on the right side by welding, and the rear top cross beam inner plate 20 of the right end connection part is connected to the first top beam connection plate 12 on the right side by welding (reference Figure 7 ).

[0047] In the above embodiment, another optional implementation is that the rear enclosure left connecting plate, rear enclosure outer plate, rear enclosure inner plate and other parts form a rear enclosure assembly, and the rear floor assembly is formed by the crossbeam connecting plate 17, crossbeam 18, longitudinal beam 19 on the rear floor, the rear floor body and floor-related parts; and the rear left enclosure inner plate rear assembly is welded to the wheelhouse inner plate 2, wheelhouse outer plate 8, first top beam connecting plate 12, and second top beam connecting plate 13. The longitudinal beam 19 is welded to the wheelhouse inner plate 2, the crossbeam connecting plate 17 is welded to the first wheelhouse reinforcement plate 7, the third wheelhouse reinforcement plate 16, and the wheelhouse inner plate 2, the second wheelhouse reinforcement plate 9 is welded to the wheelhouse inner plate 2, the rear floor body, and the second wheelhouse reinforcement plate 9, and the D-pillar connecting plate 11 is welded to the rear enclosure left connecting plate. The rear top cross beam inner plate 20 and the rear top cross beam reinforcement plate 21 constitute the rear top cross beam assembly, which is welded to the rear assembly of the left side inner plate, wherein the rear top cross beam inner plate 20 is welded to the first top beam connecting plate 12, and the rear top cross beam reinforcement plate 21 is welded to the first top beam connecting plate 12 and the second top beam connecting plate 13.

[0048] Working principle: Due to related technologies, the C-pillar inner panel reinforcement plate 4 terminates at the vehicle body waistline. When the crossbeam 18 is stressed, energy is transferred upward through the crossbeam connecting plate 17 and the first wheelhouse reinforcement plate 7 to the C-pillar inner panel reinforcement plate 4. The inner C-ring transmission channel is broken, and energy can only be transferred to the second top beam connecting plate 13 through the outer first C-pillar reinforcement plate 14, affecting the continuity of energy transfer. The C-pillar inner panel reinforcement plate 4 of the present invention extends upward and is welded to the first top beam connecting plate 12 to form a complete inner C-ring structure. When the wheel house outer panel 8 is under stress, the energy is transmitted upward through the cross beam connecting plate 17 and the first wheel house reinforcement plate 7, passes through the shock absorber reinforcement plate 6, the C-pillar inner panel support plate 5, and the C-pillar inner panel reinforcement plate 4, and is transmitted all the way to the first top beam connecting plate 12, and then transmitted to the right side through the rear top cross beam assembly (rear top cross beam reinforcement plate 21 and rear top cross beam inner plate 20), forming a complete energy transfer path; at the same time, when the D-pillar is under stress, the energy is transmitted to the longitudinal beam 19 through the D-pillar connecting plate 11, the CD-pillar connecting plate 10, and the second wheel house reinforcement plate 9, reducing the elastic deformation and improving the torsional stiffness of the vehicle body.

[0049] When the vehicle is subjected to a torsional external force, the force will be transmitted in sequence through the cross beam connecting plate 17, the first wheel house reinforcement plate 7, the shock absorber reinforcement plate 6, the C-pillar inner panel support plate 5, and the C-pillar inner panel reinforcement plate 4 to the first top beam connecting plate 12 and the second top beam connecting plate 13. The first top beam connecting plate 12 and the second top beam connecting plate 13 are transmitted to the other side C ring (i.e. the first top beam connecting plate 12 and the second top beam connecting plate 13) through the rear top cross beam reinforcement plate 21 and the side beam reinforcement plate 22, and at the same time the force is transmitted to the D-pillar connecting plate 11, thus forming a complete C-ring transmission path; when the D-pillar is subjected to force, the force on the D-pillar will be transmitted through the D-pillar connecting plate 11, the CD-pillar connecting plate 10, and the second wheel house reinforcement plate 9 to the longitudinal beam 19, thereby reducing the elastic deformation of the D-pillar and improving the torsional stiffness of the vehicle body.

[0050] With the shock absorber reinforcement plate 6 as the center, there are two upward force transmission paths: the CD-pillar connecting plate 10 and the C-pillar inner panel reinforcement plate 4; and two downward force transmission paths: the second wheelhouse reinforcement plate 9 and the first wheelhouse reinforcement plate 7. Together with the side inner panel assembly 1 and the rear floor assembly, this forms a spatial network ring structure, effectively dispersing the force transmitted from the shock absorber to the vehicle body, reducing stress concentration and improving the structural integrity of the vehicle body.

[0051] Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A vehicle body rear structure, characterized in that: It includes a connecting plate, an inner side panel assembly (1) and a rear floor assembly. A C-pillar inner panel reinforcement plate (4), a C-pillar inner panel support plate (5), a first wheelhouse reinforcement plate (7), a second wheelhouse reinforcement plate (9) and a C-D pillar connecting plate (10) are fixedly connected to the first surface of the connecting plate. A shock absorber reinforcement plate (6) is provided on the connecting plate. The upper surface of the shock absorber reinforcement plate (6) is fixedly connected to both the lower end surface of the C-pillar inner panel support plate (5) and the lower end surface of the C-D pillar connecting plate (10). The upper end surface of the C-pillar inner panel support plate (5) is fixedly connected to the lower end surface of the C-pillar inner panel reinforcement plate (4). One ends of the C-pillar inner panel reinforcement plate (4) and the C-D pillar connecting plate (10) away from the shock absorber reinforcement plate (6) are fixedly connected to the inner side panel assembly (1). The lower surface of the shock absorber reinforcement plate (6) is fixedly connected to both the upper end surface of the second wheelhouse reinforcement plate (9) and the upper end surface of the first wheelhouse reinforcement plate (7). One ends of the first wheelhouse reinforcement plate (7) and the second wheelhouse reinforcement plate (9) away from the shock absorber reinforcement plate (6) are fixedly connected to the rear floor assembly. Both ends of the connecting plate are fixedly connected to the inner side panel assembly (1) and the rear floor assembly respectively.

2. The rear vehicle body structure according to claim 1, characterized in that: The C-pillar inner panel support plate (5), the C-D pillar connecting plate (10), the first wheelhouse reinforcement plate (7) and the second wheelhouse reinforcement plate (9) are connected through the shock absorber reinforcement plate (6) to form an "X" shape.

3. A vehicle body rear structure according to claim 1 or 2, characterized in that: The connecting plate includes an inner wheelhouse panel (2), a C-pillar inner panel (3) and an outer wheelhouse panel (8). Both ends of the C-pillar inner panel (3) are fixedly connected to the inner side panel assembly (1) and the shock absorber reinforcement plate (6) respectively. The first surface of the C-pillar inner panel (3) is fixedly connected to the C-pillar inner panel reinforcement plate (4), the C-pillar inner panel support plate (5) and the C-D pillar connecting plate (10). The inner wheelhouse panel (2) and the outer wheelhouse panel (8) are fixedly connected, and both the upper ends of the inner wheelhouse panel (2) and the outer wheelhouse panel (8) are fixedly connected to the shock absorber reinforcement plate (6). One side of the inner wheelhouse panel (2) away from the outer wheelhouse panel (8) is fixedly connected to the first wheelhouse reinforcement plate (7), the second wheelhouse reinforcement plate (9) and the rear floor assembly.

4. The rear vehicle body structure according to claim 3, characterized in that: The rear body structure further includes a first C-pillar reinforcement plate (14). The first C-pillar reinforcement plate (14) is fixedly installed on one side of the C-pillar inner panel (3) away from the C-pillar inner panel reinforcement plate (4). The upper end of the first C-pillar reinforcement plate (14) is fixedly connected to the inner side panel assembly (1), and the lower end is fixedly connected to the outer wheelhouse panel (8).

5. The rear vehicle body structure according to claim 4, characterized in that: The first C-pillar reinforcement plate (14), the C-pillar inner panel (3) and the C-pillar inner panel reinforcement plate (4) form a "day" - shaped closed cavity.

6. The rear vehicle body structure according to claim 3, characterized in that: The rear body structure further includes a third wheelhouse reinforcement plate (16). The third wheelhouse reinforcement plate (16) is fixedly installed on one side of the outer wheelhouse panel (8) away from the first wheelhouse reinforcement plate (7). The upper end of the third wheelhouse reinforcement plate (16) is fixedly connected to the shock absorber reinforcement plate (6), and the lower end is fixedly connected to the rear floor assembly.

7. The rear vehicle body structure according to claim 1, characterized in that: The side inner panel assembly (1) comprises a first top beam connecting plate (12) and a second top beam connecting plate (13), wherein the first top beam connecting plate (12) and the second top beam connecting plate (13) are relatively mounted to form a cavity, wherein the cavity has a first port, a second port, and a third port.

8. The rear vehicle body structure according to claim 7, characterized in that: The first port is connected to the D-pillar connecting plate (11), and the lower surface of the D-pillar connecting plate (11) is fixedly connected to the upper end of the CD-pillar connecting plate (10).

9. The rear vehicle body structure according to claim 7, characterized in that: The second port is fixedly connected to both the C-pillar inner plate (3) and the side beam reinforcement plate (22).

10. The rear vehicle body structure according to claim 7, characterized in that: The third port is fixedly connected to the rear top crossbeam reinforcement plate (21).

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