CN115214785B - Automobile body rear structure and car - Google Patents

Abstract

The invention provides a body rear structure and an automobile, and relates to the field of body structures. The rear structure of the body includes the C/D pillar connecting plate, the rear side wall reinforcement plate and the rear wheel house reinforcement plate. The C/D pillar connecting plate and the rear side wall reinforcement plate are all integrated structures; C-pillar upper joint and D-pillar upper joint are provided, and the upper branch of the rear side wall reinforcement plate is provided with C-pillar lower joint and D-pillar lower joint; C-pillar upper joint and C-pillar lower joint are fixedly connected, D-pillar upper joint and D-pillar The lower joints of the D-pillars are fixedly connected together to form a Y-shaped reinforcement structure; the lower end of the rear side wall reinforcement plate is fixedly connected with the rear wheel house reinforcement plate, and the lower part of the rear wheel house reinforcement plate is provided with a rear sub-frame mounting bracket and a rear suspension spring installation The bracket, the Y-shaped reinforcement structure and the rear wheel house reinforcement plate are connected to form an X-shaped force transmission structure. Fewer parts avoid easy cracking, the upper and lower parts of the body are connected to form a force transmission path, and the integrity of the rear structure of the body is better, which improves the bending and torsional rigidity and durability and reliability.

Description

Body rear structure and automobile

technical field

The invention relates to the technical field of body structure, in particular to a body rear structure and an automobile.

Background technique

The main structure of the body has a significant impact on the performance of the vehicle, especially the complex force of the rear structure of the body, which bears impact from the chassis, shock absorbers, and springs. Comfort is directly related.

Usually, the rear structure of the vehicle body mainly includes the rear side wall, the rear floor beam and the roof rear beam. In the prior art, the body side wall structure includes the inner panel of the C-pillar, and the wheels fixed to the lower edge of the inner panel of the C-pillar. The outer panel of the hood, and the C-pillar reinforcing plate fixed to the inner panel of the C-pillar and the outer panel of the wheel house respectively, the upper end of the reinforcing plate of the C-pillar is connected to the joint of the body side wall structure, and the lower end of the reinforcing plate of the C-pillar is connected to the wheel house The outer panel, and the inner panel of the C-pillar, the outer panel of the wheel house and the reinforcement panel of the C-pillar jointly form a cavity structure. Improve the overall rigidity and strength of the CD-pillar by fixing the C-pillar reinforcement plate between the C-pillar inner panel and the wheelhouse outer panel to provide a cavity structure extending from the joint to the wheelhouse outer panel on the body side wall structure , increasing the force transmission path of the body frame.

Since the upper part of the rear side wall is designed with triangular windows, there are many reinforcement parts related to the C/D pillars, and too many weld joints are likely to cause cracks; moreover, the integrity of the rear structure of the body is low, and it is impossible to form a complete force transmission The path, the bending torsional rigidity and durability reliability of the whole vehicle are poor.

Contents of the invention

In order to solve the above problems, the object of the present invention is to provide a rear structure of the vehicle body and an automobile, so as to solve the problem that there are many reinforcement parts related to the C/D pillar, and too many joints of weld seams are likely to cause cracking; moreover, the rear structure of the vehicle body The integrity of the vehicle is low, a complete force transmission path cannot be formed, and the bending torsional rigidity and durability reliability of the vehicle are poor.

The technical scheme of the vehicle body rear structure of the present invention is:

The rear structure of the vehicle body includes a C/D pillar connecting plate, a rear side wall reinforcing plate and a rear wheel house reinforcing plate arranged in sequence from top to bottom, and the C/D pillar connecting plate and the rear side wall reinforcing plate are integrated Formula structure;

The C/D-pillar connection plate is provided with a C-pillar upper joint and a D-pillar upper joint, and the upper end of the rear side wall reinforcement plate is provided with a C-pillar lower joint and a D-pillar lower joint;

The upper joint of the C-pillar is fixedly connected with the lower joint of the C-pillar, and the upper joint of the D-pillar is fixedly connected with the lower joint of the D-pillar to form a Y-shaped reinforced structure;

The lower end of the rear side wall reinforcing plate is fixedly connected with the rear wheel house reinforcing plate, and the lower part of the rear wheel house reinforcing plate is provided with a rear sub-frame mounting bracket and a rear suspension spring mounting bracket at intervals, and the Y-shaped reinforcing plate The structure is connected with the rear wheel house reinforcement plate to form an X-shaped force transmission structure;

The rear side wall reinforcement plate includes a main body part, the upper profile size of the main body part gradually becomes smaller from top to bottom, the C-pillar lower joint is integrally connected to the front end of the main body part, and the D-pillar lower joint is integrally connected to the front end of the main body part. connected to the rear end of the body portion.

Further, it also includes a D-pillar reinforcement plate, the D-pillar reinforcement plate is docked with the D-pillar upper joint to form a D-pillar, the D-pillar lower joint is arranged parallel to the extension direction of the D-pillar, and the D-pillar The lower pillar joint is fixedly arranged on the lower side of the docking position between the D-pillar reinforcement plate and the D-pillar upper joint.

Further, it also includes a top crossbeam assembly and a bottom crossbeam assembly, the C/D pillar connecting plate, the rear side wall reinforcement plate and the rear wheel house reinforcement plate are symmetrically arranged in two respectively with respect to the longitudinal center line of the vehicle body;

The top cross beam assembly is fixedly connected to the upper ends of the two C/D pillar connecting plates, and the bottom cross beam assembly is fixedly connected to the lower parts of the two rear wheel house reinforcement plates to form a vehicle body outer ring force transmission structure.

Further, the roof beam assembly includes roof auxiliary beams and roof rear beams arranged in parallel at intervals, the roof auxiliary beams are connected to the upper end of the corresponding C-pillar of the C/D-pillar connecting plate, and the roof rear The crossbeam is connected to the upper side of the D-pillar corresponding to the C/D-pillar connecting plate.

Further, the bottom crossbeam assembly includes a rear underfloor crossbeam and a spare tire support crossbeam arranged in parallel at intervals, and the lower part of the rear wheelhouse reinforcing plate is fixedly connected to the rear underfloor crossbeam and the spare tire support crossbeam respectively, The rear suspension spring installation bracket is arranged on the outer side of the spare tire support beam, and the rear sub-frame installation bracket is arranged on the outer side of the rear floor under-beam.

Further, the inner side of the rear wheelhouse reinforcement plate is also provided with a rear wheelhouse bracket and a rear wheelhouse connecting plate, the upper part of the rear wheelhouse bracket is fixedly connected with the rear side wall reinforcement plate, and the rear wheelhouse The bottom of the bracket is fixedly connected with the rear wheel housing connecting plate.

Further, the bottom beam assembly also includes a rear floor upper beam, the rear floor upper beam is fixedly connected between the rear wheelhouse connecting plates on both sides, and the rear floor upper beam is connected to the rear wheelhouse The force transmission structure of the inner ring of the vehicle body is formed between the plate, the rear wheel house bracket, and the Y-shaped reinforcement structure.

Further, the rear underfloor crossbeam, the spare tire support crossbeam, and the rear floor upper crossbeam are all channel-shaped beams, and the rear underfloor crossbeam and the spare tire support crossbeam are arranged with notches facing upwards, The upper crossbeam of the rear floor is buckled with the lower crossbeam of the rear floor and the spare tire support crossbeam with the notch facing downward.

The technical scheme of automobile of the present invention is:

The automobile includes the rear structure of the vehicle body, and the rear structure of the vehicle body includes a C/D pillar connecting plate, a rear side wall reinforcing plate and a rear wheel house reinforcing plate arranged sequentially from top to bottom, and the C/D pillar connecting plate and the The above-mentioned rear side wall reinforcement plates are all of one-piece structure;

The C/D-pillar connection plate is provided with a C-pillar upper joint and a D-pillar upper joint, and the upper end of the rear side wall reinforcement plate is provided with a C-pillar lower joint and a D-pillar lower joint;

The upper joint of the C-pillar is fixedly connected with the lower joint of the C-pillar, and the upper joint of the D-pillar is fixedly connected with the lower joint of the D-pillar to form a Y-shaped reinforced structure;

The lower end of the rear side wall reinforcing plate is fixedly connected with the rear wheel house reinforcing plate, and the lower part of the rear wheel house reinforcing plate is provided with a rear sub-frame mounting bracket and a rear suspension spring mounting bracket at intervals, and the Y-shaped reinforcing plate The structure is connected with the rear wheel house reinforcement plate to form an X-shaped force transmission structure;

The rear side wall reinforcement plate includes a main body part, the upper profile size of the main body part gradually becomes smaller from top to bottom, the C-pillar lower joint is integrally connected to the front end of the main body part, and the D-pillar lower joint is integrally connected to the front end of the main body part. connected to the rear end of the body portion.

Further, it also includes a D-pillar reinforcement plate, the D-pillar reinforcement plate is docked with the D-pillar upper joint to form a D-pillar, the D-pillar lower joint is arranged parallel to the extension direction of the D-pillar, and the D-pillar The lower pillar joint is fixedly arranged on the lower side of the docking position between the D-pillar reinforcement plate and the D-pillar upper joint.

Further, it also includes a top crossbeam assembly and a bottom crossbeam assembly, the C/D pillar connecting plate, the rear side wall reinforcement plate and the rear wheel house reinforcement plate are symmetrically arranged in two respectively with respect to the longitudinal center line of the vehicle body;

The top cross beam assembly is fixedly connected to the upper ends of the two C/D pillar connecting plates, and the bottom cross beam assembly is fixedly connected to the lower parts of the two rear wheel house reinforcement plates to form a vehicle body outer ring force transmission structure.

Further, the roof beam assembly includes roof auxiliary beams and roof rear beams arranged in parallel at intervals, the roof auxiliary beams are connected to the upper end of the corresponding C-pillar of the C/D-pillar connecting plate, and the roof rear The crossbeam is connected to the upper side of the D-pillar corresponding to the C/D-pillar connecting plate.

Further, the bottom crossbeam assembly includes a rear underfloor crossbeam and a spare tire support crossbeam arranged in parallel at intervals, and the lower part of the rear wheelhouse reinforcing plate is fixedly connected to the rear underfloor crossbeam and the spare tire support crossbeam respectively, The rear suspension spring installation bracket is arranged on the outer side of the spare tire support beam, and the rear sub-frame installation bracket is arranged on the outer side of the rear floor under-beam.

Further, the inner side of the rear wheelhouse reinforcement plate is also provided with a rear wheelhouse bracket and a rear wheelhouse connecting plate, the upper part of the rear wheelhouse bracket is fixedly connected with the rear side wall reinforcement plate, and the rear wheelhouse The bottom of the bracket is fixedly connected with the rear wheel housing connecting plate.

Further, the bottom beam assembly also includes a rear floor upper beam, the rear floor upper beam is fixedly connected between the rear wheelhouse connecting plates on both sides, and the rear floor upper beam is connected to the rear wheelhouse The force transmission structure of the inner ring of the vehicle body is formed between the plate, the rear wheel house bracket, and the Y-shaped reinforcement structure.

Further, the rear underfloor crossbeam, the spare tire support crossbeam, and the rear floor upper crossbeam are all channel-shaped beams, and the rear underfloor crossbeam and the spare tire support crossbeam are arranged with notches facing upwards, The upper crossbeam of the rear floor is fastened with the lower crossbeam of the rear floor and the support crossbeam of the spare tire with the notch facing downward.

Beneficial effects: the rear structure of the vehicle body adopts a structural form in which the C/D pillar connecting plate, the rear side wall reinforcing plate and the rear wheel house reinforcing plate are sequentially arranged from top to bottom, and the C/D pillar connecting plate and the rear side wall reinforcing plate Both are one-piece structures, the C-pillar upper joint of the C/D-pillar connection plate is fixedly connected with the C-pillar lower joint of the rear side wall reinforcement plate to form the C-pillar, and the D-pillar upper joint of the C/D-pillar connection plate is connected to the rear side wall reinforcement The lower joint of the D-pillar of the plate is fixedly connected to the part of the D-pillar, and the rear triangle window space is formed between the C-pillar and part of the D-pillar, and together with the side wall reinforcement plate, it forms a Y-shaped reinforcement structure, which reduces the number of parts and avoids The problem of too many seams is easy to crack.

The lower end of the Y-shaped reinforcement structure is fixedly connected to the rear wheel house reinforcement plate, and the lower part of the rear wheel house reinforcement plate is provided with a rear sub-frame mounting bracket and a rear suspension spring mounting bracket, which further constitutes an X-shaped force transmission structure. The power transmission path is formed by conduction between the lower part and the lower part, ensuring that the impact force of the chassis and suspension can be transmitted up and down, and the integrity of the rear structure of the body is better, which improves the bending and torsional rigidity and durability reliability of the whole vehicle.

Description of drawings

Fig. 1 is the three-dimensional schematic view of the rear structure of the vehicle body in a specific embodiment of the rear structure of the vehicle body of the present invention;

Fig. 2 is the three-dimensional schematic view of the vehicle body rear structure (obliquely upward perspective from the bottom of the vehicle) in a specific embodiment of the vehicle body rear structure of the present invention;

Fig. 3 is an exploded schematic diagram of a Y-shaped reinforcement structure in a specific embodiment of the vehicle body rear structure of the present invention.

Fig. 4 is the schematic front view of the X-shaped force transmission structure in a specific embodiment of the vehicle body rear structure of the present invention;

5 is a three-dimensional schematic diagram of the force transmission structure of the outer ring of the vehicle body in a specific embodiment of the rear structure of the vehicle body of the present invention;

6 is a three-dimensional schematic diagram of the force transmission structure of the inner ring of the vehicle body in a specific embodiment of the rear structure of the vehicle body of the present invention;

Fig. 7 is the three-dimensional schematic view of the lower half of the rear structure of the vehicle body in a specific embodiment of the rear structure of the vehicle body;

In the figure: 1-C/D-pillar connection plate, 11-C-pillar upper joint, 12-D-pillar upper joint, 2-rear side wall reinforcement plate, 21-C-pillar lower joint, 22-D-pillar lower joint;

3 - Rear wheel cover reinforcement plate, 30 - Rear wheel cover, 31 - Rear sub-frame mounting bracket, 32 - Rear suspension spring mounting bracket, 33 - Rear wheel cover bracket, 34 - Rear wheel cover connecting plate;

4-D-pillar reinforcement plate, 5-roof beam assembly, 51-roof auxiliary beam, 52-roof rear beam, 6-bottom beam assembly, 60-rear floor upper beam, 61-rear floor lower beam, 62-spare Tire support beam, 7-middle floor, 8-rear floor.

Detailed ways

The specific implementation manners of the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

A specific embodiment of the rear structure of the vehicle body of the present invention, as shown in Figures 1 to 4, the rear structure of the vehicle body includes a C/D column connecting plate 1, a rear side wall reinforcement plate 2 and a rear wheel that are sequentially arranged from top to bottom. The hood reinforcement plate 3, the C/D-pillar connecting plate 1 and the rear side wall reinforcing plate 2 are all of an integrated structure; the C/D-pillar connecting plate 1 is bifurcated with a C-pillar upper joint 11 and a D-pillar upper joint 12, and the rear side C-pillar lower joint 21 and D-pillar lower joint 22 are provided at the upper branch of enclosure reinforcement plate 2; C-pillar upper joint 11 is fixedly connected to C-pillar lower joint 21, and D-pillar upper joint 12 is fixedly connected to D-pillar lower joint 22. Constitute a Y-shaped reinforcement structure; the lower end of the rear side wall reinforcement plate 2 is fixedly connected with the rear wheel house reinforcement plate 3, and the lower part of the rear wheel house reinforcement plate 3 is provided with a rear sub-frame mounting bracket 31 and a rear suspension spring mounting bracket 32 at intervals. The Y-shaped reinforcing structure is connected with the rear wheel house reinforcing plate 3 to form an X-shaped force transmission structure.

The rear structure of the vehicle body adopts the structural form in which the C/D pillar connecting plate 1, the rear side wall reinforcement plate 2 and the rear wheel house reinforcement plate 3 are arranged sequentially from top to bottom, and the C/D pillar connecting plate 1 and the rear side wall reinforcement The panels 2 are all integral structures, the C-pillar upper joint 11 of the C/D-pillar connecting panel 1 is fixedly connected with the C-pillar lower joint 21 of the rear side wall reinforcement panel 2 to form the C-pillar, and the D-pillar of the C/D-pillar connecting panel 1 The upper joint 12 is fixedly connected to the lower joint 22 of the D-pillar of the rear side wall reinforcement plate 2 to form a part of the D-pillar. A space for the rear triangular window is formed between the C-pillar and part of the D-pillar, and together with the side wall reinforcement plate 2, it forms a Y-shaped The structure is strengthened, the number of parts is reduced, and the problem of too many joints and easy cracking is avoided.

The lower end of the Y-shaped reinforcement structure is fixedly connected to the rear wheel house reinforcement plate 3, and the lower part of the rear wheel house reinforcement plate 3 is provided with a rear sub-frame mounting bracket 31 and a rear suspension spring mounting bracket 32 at intervals, further forming an X-shaped force transmission structure. Structure, the upper and lower parts of the body are connected to form a force transmission path, ensuring that the impact force of the chassis and suspension can be transmitted up and down, and the integrity of the rear structure of the body is better, which improves the bending torsional rigidity and durability of the vehicle reliability.

In this embodiment, the rear side wall reinforcement panel 2 includes a main body, and the upper profile of the main body is in an inverted trapezoidal shape. As shown in FIG. 11 is integrally connected to the rear end corner of the main body. Moreover, the rear structure of the vehicle body also includes a D-pillar reinforcement plate 4, which is docked with the D-pillar upper joint 12 of the C/D-pillar connection plate 1 to form a D-pillar, and the D-pillar lower joint 22 is parallel to the extension of the D-pillar The direction is set, and the D-pillar lower joint 22 of the rear side wall reinforcement panel 2 is fixedly arranged on the lower side of the docking position of the D-pillar.

The C-pillar is formed by butt-welding the C-pillar lower joint 21 and the C-pillar upper joint 11 of the C/D-pillar connection plate 1, and the D-pillar reinforcement plate 4 is butted with the D-pillar upper joint 12 of the C/D-pillar connection plate 1 to form a C-pillar. The D-pillar, which creates the frame for the rear quarter window. Moreover, the joints between the D-pillar lower joint 22 and the D-pillar are overlapped and welded to achieve the purpose of improving the structural strength and rigidity of the D-pillar and conducting the force transmission path. The C-pillar and D-pillar here are mainly composed of the C/D-pillar connection plate 1 and the rear side wall reinforcement plate 2. The number of parts is small, the welding butt joint position is reduced, and the integrity of the rear structure of the vehicle body is improved.

Among them, the rear structure of the vehicle body also includes a top beam assembly 5 and a bottom beam assembly 6, and two C/D pillar connecting plates 1, a rear side wall reinforcement plate 2 and a rear wheel house reinforcement plate 3 are arranged symmetrically with respect to the longitudinal center line of the vehicle body. ; The top beam assembly 5 is fixedly connected to the upper ends of the two C/D pillar connecting plates 1, and the bottom beam assembly 6 is fixedly connected to the lower part of the two rear wheel house reinforcement plates 3 to form the outer ring force transmission structure of the vehicle body. Through the structural design of the C/D pillar connection plate 1, the rear side wall reinforcement plate 2 and the rear wheel house reinforcement plate 3, an X-shaped force transmission structure is constructed on both sides of the vehicle body. On this basis, combined with the top beam assembly 5 Connect the C/D pillar connecting plate 1 on both sides, and the bottom beam assembly 6 connects the rear wheel house reinforcement plate 3 on both sides, realizing the conduction of the transverse force transmission path between the left and right X-shaped force transmission structures.

Specifically, the roof beam assembly 5 includes roof auxiliary beams 51 and roof rear beams 52 arranged in parallel and at intervals. As shown in FIG. The top cover rear beam 52 is connected to the upper side of the D-pillar corresponding to the C/D-pillar connecting plate 1 . The roof beam assembly 5 is designed as a roof auxiliary beam 51 and a roof rear beam 52, which improves the strength and rigidity of the roof structure. Moreover, between the C-pillar and the roof auxiliary beam 51, and between the D-pillar and the roof rear beam 52 Parallel horizontal force transmission paths are formed between them, which makes the force transmission structure of the upper part of the body more consistent, can effectively disperse the impact force from the bottom of the body, and improves the overall durability and reliability.

Correspondingly, the bottom crossbeam assembly 6 includes rear floor underfloor crossbeams 61 and spare tire support crossbeams 62 arranged in parallel at intervals. The sub-frame mounting bracket 31 is arranged on the outside of the underfloor crossbeam 61 , and the rear suspension spring mounting bracket 32 is arranged on the outside of the spare tire supporting crossbeam 62 . Among them, the middle floor 7 is arranged on the front side of the rear underfloor crossbeam 61, and the rear floor 8 is arranged on the rear side of the rear underfloor crossbeam 61. The rear wheel house reinforcing plate 3 and the spare tire support beam 62 respectively form side-by-side horizontal force transmission paths, so that the continuity of the force transmission structure of the lower half of the vehicle body is better, and the force transmission channel of the lower part of the vehicle body is increased. Effectively improve the NVH performance of the vehicle.

In this embodiment, the inner side of the rear wheel house reinforcement plate 3 is also provided with a rear wheel house bracket 33 and a rear wheel house connecting plate 34, as shown in Fig. 6 and Fig. Reinforcing plate 2 is fixedly connected, and the bottom of rear wheel house support 33 is fixedly connected with rear wheel house connecting plate 34, and rear wheel house 30 is fixedly connected between rear wheel house support 33 and rear wheel house reinforcing plate 3. The bottom beam assembly 6 also includes a rear floor upper beam 60, which is fixedly connected between the rear wheelhouse connecting plates 34 on both sides, and the rear floor upper beam 60 is connected to the rear wheelhouse connecting plate 34 and the rear wheelhouse bracket 33. The force transmission structure of the inner ring of the vehicle body is formed between the Y-shaped reinforced structures.

Utilize the rear wheel house bracket 33 and the rear wheel house connecting plate 34 to be fixed on the inner side of the rear wheel house bracket 33, and an additional transverse force transmission path is formed between the rear floor upper beam 60 and the rear wheel house connecting plate 34 on both sides , the force transmission path is located on the inner side of the two underbody force transmission paths, and the combination of one inside and two outside can enhance the overall bending and torsional rigidity and improve the side impact performance of the rear body. In addition, the rear floor lower beam 61, the spare tire support beam 62, and the rear floor upper beam 60 are all channel-shaped beam bodies, the rear floor lower beam 61 and the spare tire support beam 62 are arranged upwardly with notches, and the rear floor upper beam 60 is in the shape of a groove. The notch is buckled downwards between the lower crossbeam 61 and the spare tire support crossbeam 62 under the rear floor. The assembly form of upper and lower buckling is adopted, and the edges are aligned and then lapped and welded, which strengthens the original structure of the rear wheel house 30 and ensures that the chassis load can be effectively transmitted and dispersed.

In the specific embodiment of the automobile of the present invention, the automobile includes a vehicle body rear structure, and the vehicle body rear structure is the same as each specific embodiment of the vehicle body rear structure in the specific implementation manners of the vehicle body rear structure of the present invention, and will not be repeated here. .

The above is only a preferred embodiment of the present invention, it should be pointed out that for those of ordinary skill in the art, without departing from the technical principle of the present invention, some improvements and replacements can also be made, these improvements and replacements It should also be regarded as the protection scope of the present invention.

Claims (9)

1. A rear structure of a vehicle body is characterized in that it comprises a C/D pillar connecting plate, a rear side wall reinforcing plate and a rear wheel house reinforcing plate arranged successively from top to bottom, the C/D pillar connecting plate and the The above-mentioned rear side wall reinforcement plates are all of one-piece structure; The C/D-pillar connection plate is provided with a C-pillar upper joint and a D-pillar upper joint, and the upper end of the rear side wall reinforcement plate is provided with a C-pillar lower joint and a D-pillar lower joint; The upper joint of the C-pillar is fixedly connected with the lower joint of the C-pillar, and the upper joint of the D-pillar is fixedly connected with the lower joint of the D-pillar to form a Y-shaped reinforced structure; The lower end of the rear side wall reinforcing plate is fixedly connected with the rear wheel house reinforcing plate, and the lower part of the rear wheel house reinforcing plate is provided with a rear sub-frame mounting bracket and a rear suspension spring mounting bracket at intervals, and the Y-shaped reinforcing plate The structure is connected with the rear wheel house reinforcement plate to form an X-shaped force transmission structure; The rear side wall reinforcement plate includes a main body part, the upper profile size of the main body part gradually becomes smaller from top to bottom, the C-pillar lower joint is integrally connected to the front end of the main body part, and the D-pillar lower joint is integrally connected to the front end of the main body part. connected to the rear end of the body portion. 2. The vehicle body rear structure according to claim 1, further comprising a D-pillar reinforcement plate, the D-pillar reinforcement plate is docked with the D-pillar upper joint to form a D-pillar, and the D-pillar lower joint It is arranged parallel to the extension direction of the D-pillar, and the lower joint of the D-pillar is fixedly arranged on the lower side of the docking position of the D-pillar reinforcement plate and the upper joint of the D-pillar. 3. The vehicle body rear structure according to any one of claims 1-2, further comprising a top beam assembly and a bottom beam assembly, the C/D pillar connecting plate, the rear side wall reinforcement plate and the rear wheel There are two hood reinforcement plates symmetrically with respect to the longitudinal center line of the car body; The top cross beam assembly is fixedly connected to the upper ends of the two C/D pillar connecting plates, and the bottom cross beam assembly is fixedly connected to the lower parts of the two rear wheel house reinforcement plates to form a vehicle body outer ring force transmission structure. 4. The vehicle body rear structure according to claim 3, wherein the roof beam assembly comprises roof auxiliary beams and roof rear beams arranged in parallel at intervals, and the roof auxiliary beams are connected to the C/ The D-pillar connecting plate corresponds to the upper end of the C-pillar, and the roof rear beam is connected to the upper side of the C/D-pillar connecting plate corresponding to the D-pillar. 5. The rear structure of the vehicle body according to claim 3, wherein the bottom beam assembly comprises a rear floor under-beam and a spare tire support beam arranged in parallel at intervals, and the lower part of the rear wheelhouse reinforcing plate is connected to the rear wheel house reinforcement plate respectively. The rear underfloor crossbeam and the spare tire support crossbeam are fixedly connected, the rear suspension spring installation bracket is arranged on the outside of the spare tire support crossbeam, and the rear sub-frame installation bracket is arranged on the rear underfloor underbeam. outside. 6. The vehicle body rear structure according to claim 5, characterized in that, the inner side of the rear wheel house reinforcing plate is also provided with a rear wheel house bracket and a rear wheel house connecting plate, and the upper part of the rear wheel house bracket is connected to The rear side wall reinforcing plate is fixedly connected, and the lower part of the rear wheel house bracket is fixedly connected with the rear wheel house connecting plate. 7. The rear structure of the vehicle body according to claim 6, wherein the bottom beam assembly further comprises a rear floor upper beam, and the rear floor upper beam is fixedly connected between the rear wheelhouse connecting plates on both sides. In between, the upper beam on the rear floor, the connecting plate of the rear wheel house, the support of the rear wheel house, and the Y-shaped reinforcement structure form the force transmission structure of the inner ring of the vehicle body. 8. The rear structure of the vehicle body according to claim 7, characterized in that, the lower beam under the rear floor, the supporting beam for the spare tire, and the upper beam on the rear floor are all channel-shaped beams, and the lower beam under the rear floor The crossbeam and the spare tire support crossbeam are arranged with the notch facing upwards, and the rear floor upper crossbeam is fastened with the rear floor lower crossbeam and the spare tire support crossbeam with the notch facing downward. 9. An automobile, characterized by comprising a vehicle body rear structure, said vehicle body rear structure being the vehicle body rear structure described in any one of claims 1-8.