Rear upper section assembly

Abstract

The invention belongs to the technical field of automobile processing, and provides a rear upper section assembly which is characterized in that a first end part of a spring mounting plate is welded with the side wall of an upper inner plate, a second end part is welded with the side wall of a lower inner plate, a third end part is welded with the side wall of a middle cover plate, and welding holes are formed in the side wall of the middle cover plate and the side wall of the upper inner plate; the left side convex part and the lower side convex part of the back door mounting plate are welded with the side wall of the middle cover plate, the right side convex part is welded with the side wall of the upper inner plate, the upper side convex part is welded with the side wall of the upper cover plate, welding holes are formed in the side wall of the middle cover plate and the side wall of the upper inner plate, and a welding groove corresponding to the right side convex part is formed in the side wall of the upper inner plate. According to the rear upper section assembly, the three ends of the spring mounting plate are simultaneously connected with the upper inner plate, the middle cover plate and the lower inner plate correspondingly, and the welding sequence and structure of the spring mounting plate and the back door mounting plate are adjusted, so that the requirement for replacing traditional carbon dioxide welding with spot welding is met; and the performance of the rear upper section assembly and the rigidity of a mounting point are improved.

Description

Technical Field

[0001] The invention belongs to the technical field of automobile processing, and in particular relates to a rear upper section assembly. Background Art

[0002] With the continuous development of automobile manufacturing technology, the rear upper section assembly of the vehicle, as an important part of the body structure, has a complex structure and involves multiple installation points. These installation points not only need to have sufficient rigidity to ensure the overall rigidity and modal stability of the vehicle, but also need to meet multiple safety and performance requirements. However, the current welding process of the rear upper section assembly still faces many challenges.

[0003] Traditional rear upper section assemblies typically use welding methods such as carbon dioxide welding (CO2 welding) to connect various components. Although this process can meet structural requirements in some aspects, it has a series of significant disadvantages. First, the welding process is time-consuming and inconvenient to operate, and pollutants are generated during the welding process, causing environmental pollution. Second, welding is difficult to control dimensional consistency, which can easily cause deformation and dimensional deviation of welded parts, thereby affecting the assembly accuracy of the entire vehicle. In addition, the welding process is prone to causing abnormal noises and may cause rust and cracking during long-term use, thus affecting the service life and performance of the entire vehicle.

[0004] To address these issues, attempts were made to adjust the welding process for the rear upper section assembly, using spot welding instead of traditional welding. Spot welding not only reduces labor time and is easy to operate, but also offers better control over environmental pollution and dimensional consistency, making it a preferred process for manufacturing the rear upper section assembly. However, due to the location of the internal mounting points of the rear upper section assembly and interference from structural components, the internal structure of the rear upper section assembly and the tailgate mounting plate cannot be spot welded, requiring welding to be used for processing.

[0005] In view of this, overcoming the defects of the above-mentioned prior art is an urgent problem to be solved in this technical field. Summary of the Invention

[0006] To address the above problems, the present invention proposes a rear upper section assembly, comprising: an outer panel assembly, an inner panel body, a side panel inner body, a side panel outer body, a spring mounting plate, and a tailgate mounting plate, wherein the side wall of the inner panel body is connected to the outer panel assembly and the side edge of the inner panel body is connected to the side panel inner body, the side of the side panel inner body facing the outer panel assembly is connected to the side panel outer body, and one end of the outer panel assembly extends to form a connection with the side wall of the side panel outer body; The side panel inner body includes an upper inner panel and a lower inner panel connected end to end, and the side panel outer body includes an upper cover panel, a middle cover panel and a lower cover panel connected end to end. A cavity is formed between the upper inner panel and the middle cover panel for accommodating the spring mounting plate and the tailgate mounting plate. The spring mounting plate includes a first end, a second end, and a third end. The first end is welded to the side wall of the upper inner plate, the second end is welded to the side wall of the lower inner plate, and the third end is welded to the side wall of the middle cover plate. A welding hole is provided on the side wall of the middle cover plate corresponding to the second end, and a welding hole is provided on the side wall of the upper inner plate corresponding to the third end. The tailgate mounting plate includes a left side convex portion, a right side convex portion, an upper side convex portion and a lower side convex portion. The left side convex portion and the lower side convex portion are welded to the side wall of the middle cover plate, the right side convex portion is welded to the side wall of the upper inner plate, and the upper side convex portion is welded to the side wall of the upper cover plate. A welding hole is provided on the side wall of the middle cover plate corresponding to the upper side convex portion, and welding holes are provided on the side wall of the upper inner plate corresponding to the left side convex portion and the lower side convex portion, and a welding groove is provided on the side wall of the upper inner plate corresponding to the right side convex portion, and the welding groove extends out of the covering surface of the middle cover plate on the upper inner plate.

[0007] Furthermore, the end portion of the right side protrusion of the tailgate mounting plate is flush with the side wall of the middle cover plate.

[0008] Furthermore, it also includes a first partition plate and a second partition plate, the outer wall of the rear end of the middle cover plate is connected to the inner wall of the front end of the lower cover plate, the inner wall of the rear end of the upper inner plate is connected to the outer wall of the front end of the lower inner plate, and a second hollow channel is formed between the inner wall of the lower inner plate and the inner wall of the lower cover plate; The first partition and the second partition are respectively located at the head and tail ends of the second hollow channel, the side of the first partition is connected to the inner wall of the head end of the middle cover plate and the lower cover plate, and the side of the second partition is connected to the inner wall of the tail end of the lower inner plate and the lower cover plate.

[0009] Furthermore, the side edges of the first partition are connected to the upper welding plate portion, the left welding plate portion, and the right welding plate portion; The upper welding plate portion and the left welding plate portion of the first partition are stacked with the rear end side wall of the middle cover plate and the front end side wall of the lower cover plate, and the right welding plate portion of the first partition is connected to the side wall of the lower inner plate.

[0010] Furthermore, it further comprises a bracket, wherein the connecting portion of the bracket is in contact with the outer wall of the lower inner plate; The side of the first partition is also connected to the lower welding plate portion, and the lower welding plate portion of the first partition, the lower inner plate and the connecting portion of the bracket are stacked.

[0011] Furthermore, the side edges of the second partition are connected to the first extension portion, the second extension portion, the third extension portion and the fourth extension portion which are arranged circumferentially; The first extension portion and the second extension portion are both connected to the inner wall of the lower cover plate, the third extension portion and the fourth extension portion are both connected to the inner wall of the lower inner plate, the first extension portion and the fourth extension portion both extend toward the side facing away from the second hollow channel, and the second extension portion and the third extension portion both extend toward the side facing the second hollow channel.

[0012] Furthermore, it also includes a third partition and a fourth partition; A third hollow inner cavity is formed between the upper inner plate and the upper cover plate, and the third hollow inner cavity includes a first port and a second port. The side edge of the third partition plate is in contact with the inner wall of the upper inner plate and the upper cover plate to seal the first port, and the side edge of the fourth partition plate is in contact with the inner wall of the upper inner plate and the upper cover plate to seal the second port.

[0013] Furthermore, the sides of the third partition plate and the fourth partition plate are connected to a plurality of first welding plate portions that are in contact with the inner wall of the upper inner plate, and a plurality of second welding plate portions that are in contact with the inner wall of the upper cover plate; The first welding plate portion extends toward one side of the hollow inner cavity, and the second welding plate portion extends away from one side of the hollow inner cavity.

[0014] Furthermore, the side walls of the spring mounting plate, the first partition plate, the second partition plate, the third partition plate, and the fourth partition plate are all provided with weight-reducing holes.

[0015] Furthermore, the outer plate assembly includes an outer edge lower plate and a connecting plate; One end of the connecting plate is connected to the outer lower plate, and the other end is connected to the lower cover plate and the side of the middle cover plate. The side wall of the connecting plate is provided with a first through hole and a second through hole. The welding point of the lower cover plate and the lower inner plate is aligned with the first through hole, and the welding point of the inner plate body and the upper inner plate is aligned with the second through hole.

[0016] Compared with the prior art, the embodiments of the present invention have at least the following advantages: The rear upper section assembly of the present invention satisfies the operating space for spot welding of the spring mounting plate by connecting the three ends of the spring mounting plate to the upper inner plate, the middle cover plate and the lower inner plate respectively, and opening welding holes on the upper inner plate and the lower inner plate; at the same time, by opening a welding groove on the upper inner plate, space for spot welding is provided for the connection between the tailgate mounting plate and the upper inner plate, and by opening welding holes on the upper inner plate, the space requirement for spot welding of the tailgate mounting plate and the middle cover plate is met; the welding method of the internal components of the rear upper section assembly is changed to meet the demand of using spot welding to replace traditional carbon dioxide welding, and by adjusting the welding sequence and structure of the spring mounting plate and the tailgate mounting plate, the welding or plug welding design of the rear upper section assembly is directly reduced, which not only solves the problems of long working hours, inconvenient operation, environmental pollution, poor dimensional consistency and the like caused by traditional welding, but also effectively improves the performance and mounting point stiffness of the rear upper section assembly, optimizes the performance of the whole vehicle, and meets the safety and stiffness requirements.

[0017] 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

[0018] 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.

[0019] Figure 1 A schematic diagram of the rear upper section assembly according to an embodiment of the present invention is shown; Figure 2 An exploded schematic diagram of the rear upper section assembly in an embodiment of the present invention is shown; Figure 3 A schematic diagram of an upper cover plate, a middle cover plate, and a lower cover plate in an embodiment of the present invention is shown; Figure 4 A schematic diagram of the outer lower plate and the connecting plate in an embodiment of the present invention is shown; Figure 5 A schematic diagram of an upper inner plate according to an embodiment of the present invention is shown; Figure 6 A partial schematic diagram of the installation of a back door mounting plate according to an embodiment of the present invention is shown; Figure 7 A schematic diagram of the assembly of the upper cover plate, the middle cover plate and the lower inner plate in an embodiment of the present invention is shown; Figure 8 Shown Figure 7 Partial schematic Figure 1 ; Figure 9 Shown Figure 7 Partial schematic Figure 2 ; Figure 10 shows a schematic diagram of a third partition in an embodiment of the present invention; Figure 11 Shows a cross-sectional view of the rear upper section assembly in an embodiment of the present invention Figure 1 ; Figure 12 Shows a cross-sectional view of the rear upper section assembly in an embodiment of the present invention Figure 2 .

[0020] In the figure, 1. spring mounting plate; 2. tailgate mounting plate; 3. inner plate; 4. upper cover plate; 5. upper inner plate; 6. middle cover plate; 7. lower cover plate; 8. lower inner plate; 9. welding groove; 10. first partition plate; 11. second partition plate; 12. third partition plate; 13. fourth partition plate; 14. bracket; 15. outer edge lower plate; 16. connecting plate; 1601. first through hole; 1602. second through hole. DETAILED DESCRIPTION

[0021] The following description provides many different embodiments or examples for implementing different features of the present invention. The components and arrangements described in the following specific examples are only used to simplify the present invention and are only used as examples, not to limit the present invention.

[0022] 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.

[0023] The present invention provides a rear upper section assembly, Figure 1 A schematic diagram of the rear upper section assembly in an embodiment of the present invention is shown, with reference to FIG. Figure 1 and Figure 2 The rear upper section assembly includes: an outer panel assembly, an inner panel body 3, a side panel inner body, a side panel outer body, a spring mounting plate 1 and a tailgate mounting plate 2. The side wall of the inner panel body 3 is connected to the outer panel assembly and the side edge of the inner panel body 3 is connected to the side panel inner body. The side of the side panel inner body facing the outer panel assembly is connected to the side panel outer body. One end of the outer panel assembly extends to form a connection with the side wall of the side panel outer body. The side panel inner body includes an upper inner panel 5 and a lower inner panel 8 connected end to end, and the side panel outer body includes an upper cover panel 4, a middle cover panel 6 and a lower cover panel 7 connected end to end. A cavity is formed between the upper inner panel 5 and the middle cover panel 6 for accommodating the spring mounting plate 1 and the tailgate mounting plate 2. The spring mounting plate 1 includes a first end, a second end, and a third end. The first end is welded to the side wall of the upper inner plate 5, the second end is welded to the side wall of the lower inner plate 8, and the third end is welded to the side wall of the middle cover plate 6. A welding hole is provided on the side wall of the middle cover plate 6 corresponding to the second end, and a welding hole is provided on the side wall of the upper inner plate 5 corresponding to the third end. The tailgate mounting plate 2 includes a left side convex portion, a right side convex portion, an upper side convex portion and a lower side convex portion. The left side convex portion and the lower side convex portion are welded to the side wall of the middle cover plate 6, the right side convex portion is welded to the side wall of the upper inner plate 5, and the upper side convex portion is welded to the side wall of the upper cover plate 4. A welding hole is opened on the side wall of the middle cover plate 6 corresponding to the upper side convex portion, and welding holes are opened on the side wall of the upper inner plate 5 corresponding to the left side convex portion and the lower side convex portion, and a welding groove 9 is opened on the side wall of the upper inner plate 5 corresponding to the right side convex portion, and the welding groove 9 extends out of the covering surface of the middle cover plate 6 on the upper inner plate 5.

[0024] refer to Figure 2 、 Figure 5 、 Figure 7 、 Figure 8 and Figure 11, during the assembly of the spring mounting plate 1, the first end portion of the spring mounting plate 1 is spot-welded to the side wall of the upper inner plate 5. After the upper inner plate 5 and the middle cover plate 6 are assembled, the third end portion is spot-welded to the side wall of the middle cover plate 6 through the welding hole of the upper inner plate 5, and the second end portion is spot-welded to the side wall of the lower inner plate 8 through the welding hole of the middle cover plate 6. Compared with the traditional method and structure of welding the spring mounting plate only to the upper inner plate 5, the present application changes the welding method of the transmission spring mounting plate and the upper inner plate 5, strengthens the mounting point by welding the spring mounting plate 1 and the middle cover plate 6, realizes the supporting connection function of the entire cavity by welding the spring mounting plate 1 and the upper inner plate 5, realizes the simultaneous connection with the upper inner plate 5, the middle cover plate 6 and the lower inner plate 8 by the spring mounting plate 1, while ensuring the space requirements for spot welding operations, the performance of the entire D-pillar and the stiffness of the pivot point are improved.

[0025] At the same time, during the assembly process of the back door mounting plate 2, Figure 6 and Figure 12 In the example shown, the back door mounting plate 2 includes a left side convex portion, a right side convex portion, an upper side convex portion and a lower side convex portion. After completing the welding of the upper side convex portion of the back door mounting plate 2 and the upper cover plate 4, and the lower side convex portion and the middle cover plate 6, the welding method of transmitting the left side convex portion, the right side convex portion and the upper inner plate 5 for welding is changed. By opening a welding hole corresponding to the left side convex portion on the upper inner plate 5, the left side convex portion and the side wall of the middle cover plate 6 are spot welded, and by opening a welding groove 9 corresponding to the right side convex portion on the side wall of the upper inner plate 5, a gap is formed between the side walls of the upper inner plate 5 and the middle cover plate 6 to meet the spot welding operation of the upper inner plate 5 and the right side convex portion from the side.

[0026] The present application changes the traditional installation method of the spring mounting plate 1 by simultaneously connecting the three ends of the spring mounting plate 1 to the upper inner plate 5, the middle cover plate 6, and the lower inner plate 8, thereby directly improving the overall stiffness and stability of the cavity, and on the basis of the welding holes provided in the upper inner plate 5 and the lower inner plate 8, the operating space for spot welding operations on the spring mounting plate 1 is met; at the same time, the present application also provides space for spot welding operations for the connecting ends of the tailgate mounting plate 2 and the upper inner plate 5 by opening a welding groove 9 on the upper inner plate 5, and meets the space requirements for spot welding operations between the tailgate mounting plate 2 and the middle cover plate 6 by opening a welding hole on the upper inner plate 5.

[0027] The welding method of the internal components of the rear upper assembly has been changed to meet the demand for spot welding instead of traditional carbon dioxide welding. By adjusting the welding sequence and structure of the spring mounting plate 1 and the tailgate mounting plate 2, the welding or plug welding design of the rear upper assembly has been directly reduced. This not only solves the problems of long working hours, inconvenient operation, environmental pollution, and poor dimensional consistency caused by traditional welding, but also effectively improves the performance of the rear upper assembly and the stiffness of the mounting points, optimizes the performance of the entire vehicle, and meets the safety and stiffness requirements.

[0028] The end of the right side protrusion of the back door mounting plate 2 is flush with the side wall of the middle cover plate 6 and maintains a predetermined distance from the end of the welding groove 9 .

[0029] In this embodiment, reference Figure 2 and Figure 3 The outer wall of the tail end of the middle cover plate 6 is connected to the inner wall of the head end of the lower cover plate 7, the inner wall of the tail end of the upper inner plate 5 is connected to the outer wall of the head end of the lower inner plate 8, and a second hollow channel is formed between the inner wall of the lower inner plate 8 and the inner wall of the lower cover plate 7, and the second hollow channel is connected to the cavity between the upper inner plate 5 and the middle cover plate 6.

[0030] Correspondingly, reference Figure 7 The present application also includes a first partition 10 and a second partition 11, which are respectively located at the head and tail ends of the second hollow channel. The side of the first partition 10 is connected to the inner wall of the head end of the middle cover plate 6 and the lower cover plate 7, and the side of the second partition 11 is connected to the inner wall of the tail end of the lower inner plate 8 and the lower cover plate 7, so as to ensure the integrity of the second hollow channel.

[0031] Among them, Figure 8 and Figure 7 In the example shown, the side edges of the first partition 10 are connected to the upper welding plate portion, the left welding plate portion, and the right welding plate portion; The upper welding plate portion of the first partition 10 is stacked with the rear end side wall of the middle cover plate 6 and the front end side wall of the lower cover plate 7, and the three-layer welding of the welding plate portion, the middle cover plate 6 and the lower cover plate 7 is achieved by spot welding; The left welding plate portion of the first partition 10 is also stacked with the rear end side wall of the middle cover plate 6 and the front end side wall of the lower cover plate 7, and the three-layer welding of the welding plate portion, the middle cover plate 6 and the lower cover plate 7 is achieved by spot welding; Correspondingly, the right welding plate portion of the first partition plate 10 is fitted to the side wall of the lower inner plate 8 and connected by spot welding.

[0032] For example, the upper welding plate portion and the left welding plate portion extend toward one side of the cavity, and the right welding plate portion extends toward one side of the second hollow channel; in the actual production and processing process, the right welding plate portion and the lower inner plate 8 are first spot-welded, and then the upper welding plate portion and the middle cover plate 6 and the lower cover plate 7 are spot-welded, as well as the left welding plate portion and the middle cover plate 6 and the lower cover plate 7 are spot-welded. By using two three-layer welding structures instead of the traditional two-layer welding structure, the overall hardness of the rear upper section assembly of this application is directly improved.

[0033] At the same time, in this embodiment, the connection portion of the bracket 14 is in contact with the outer wall of the lower inner plate 8; The side of the first partition 10 is also connected to the lower welding plate portion. The lower welding plate portion of the first partition 10, the lower inner plate 8 and the connection portion of the bracket 14 are arranged in layers. During the actual production and processing process, the assembly of the lower welding plate portion, the lower inner plate 8 and the connection portion of the bracket 14 is achieved through spot welding technology, thereby forming a three-layer stacked weld. On the basis of the above two three-layer welding structures, the overall hardness of the rear upper section assembly of this application is further improved.

[0034] In addition, in this embodiment, the second partition plate 11 also includes four side walls, each of which is connected to the welded plate portion. Figure 9 , according to the left, upper, right and lower directions, the side edges of the second partition 11 are connected to the first extension portion, the second extension portion, the third extension portion and the fourth extension portion arranged circumferentially; The first extension portion and the second extension portion of the second partition 11 are both fitted to the inner wall of the lower cover plate 7 and are connected by spot welding; The third extension portion and the fourth extension portion of the second partition plate 11 are both fitted to the inner wall of the lower inner plate 8 and are welded together by spot welding; Exemplarily, the first extension portion and the fourth extension portion both extend toward the side facing away from the second hollow channel, and the second extension portion and the third extension portion both extend toward the side facing the second hollow channel, forming a technical requirement of alternating connection, further improving the integrity between the lower cover plate 7 and the lower inner plate 8.

[0035] In addition, reference Figure 2 and Figure 10 , further comprising a third separator 12 and a fourth separator 13; A third hollow inner cavity is formed between the upper inner plate 5 and the upper cover plate 4, and the third hollow inner cavity includes a first port and a second port. The side of the third partition plate 12 is in contact with the inner walls of the upper inner plate 5 and the upper cover plate 4 to seal the first port, and the side of the fourth partition plate 13 is in contact with the inner walls of the upper inner plate 5 and the upper cover plate 4 to seal the second port.

[0036] The sides of the third partition plate 12 and the fourth partition plate 13 are connected to a plurality of first welding plate portions that are in contact with the inner wall of the upper inner plate 5, and a plurality of second welding plate portions that are in contact with the inner wall of the upper cover plate 4; The first welding plate portion extends toward one side of the hollow inner cavity, and the second welding plate portion extends away from one side of the hollow inner cavity.

[0037] During the actual processing, the spot welding operation is first performed on the first welding plate portion of the third partition 12 and the fourth partition 13 and the upper inner plate 5, and then the spot welding operation is performed on the second welding plate portion of the third partition 12 and the fourth partition 13 and the upper cover plate 4 to improve the connection firmness between the upper inner plate 5 and the upper cover plate 4.

[0038] In this embodiment, reference Figure 4 , the outer plate assembly includes an outer lower plate 15 and a connecting plate 16; One end of the connecting plate 16 is connected to the outer lower plate 15, and the other end is connected to the side of the lower cover plate 7 and the middle cover plate 6. The side wall of the connecting plate 16 is provided with a first through hole 1601 and a second through hole 1602. The welding point of the lower cover plate 7 and the lower inner plate 8 is aligned with the first through hole 1601, and the welding point of the inner plate body 3 and the upper inner plate 5 is aligned with the second through hole 1602.

[0039] The first through hole 1601 and the second through hole 1602 provide working space for welding the lower cover plate 7 and the lower inner plate 8, and the inner plate body 3 and the upper inner plate 5, so as to meet the requirements of spot welding operations.

[0040] On the basis of satisfying the overall stiffness, the side walls of the spring mounting plate 1, the first partition plate 10, the second partition plate 11, the third partition plate 12, and the fourth partition plate 13 are all provided with weight-reducing holes to achieve weight reduction of the entire assembly.

[0041] In the description of the present invention, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features indicated. Thus, a feature specified as "first" or "second" may explicitly or implicitly include one or more of the specified features. In the description of the present invention, "plurality" means two or more, unless otherwise specifically defined.

[0042] It should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood broadly. For example, they may refer to fixed, removable, or integral connections; mechanical, electrical, or intercommunication; direct or indirect connections through an intermediary; and may encompass internal connectivity between multiple components or the interaction between multiple components. Those skilled in the art will understand the specific meanings of these terms in the present invention based on specific circumstances.

[0043] It should be understood that all terms used to indicate orientation or positional relationships are based on the orientation or positional relationships shown in the accompanying drawings and are only used to facilitate the description of the present invention and simplify the description. They do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and should not be understood as a limitation on the present invention.

[0044] 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 rear upper section assembly, characterized in that: include: An outer panel assembly, an inner panel body (3), a side panel inner body, a side panel outer body, a spring mounting plate (1) and a back door mounting plate (2), wherein the side wall of the inner panel body (3) is connected to the outer panel assembly and the side edge of the inner panel body (3) is connected to the side panel inner body, the side of the side panel inner body facing the outer panel assembly is connected to the side panel outer body, and one end of the outer panel assembly extends to form a connection with the side wall of the side panel outer body; The side panel inner body comprises an upper inner panel (5) and a lower inner panel (8) connected end to end, and the side panel outer body comprises an upper cover panel (4), a middle cover panel (6) and a lower cover panel (7) connected end to end, wherein a cavity for accommodating a spring mounting plate (1) and a rear door mounting plate (2) is formed between the upper inner panel (5) and the middle cover panel (6); The spring mounting plate (1) comprises a first end, a second end and a third end, the first end being welded to the side wall of the upper inner plate (5), the second end being welded to the side wall of the lower inner plate (8), and the third end being welded to the side wall of the middle cover plate (6), a welding hole being provided on the side wall of the middle cover plate (6) corresponding to the second end, and a welding hole being provided on the side wall of the upper inner plate (5) corresponding to the third end; The back door mounting plate (2) includes a left convex portion, a right convex portion, an upper convex portion and a lower convex portion, the left convex portion and the lower convex portion are both welded to the side wall of the middle cover plate (6), the right convex portion is welded to the side wall of the upper inner plate (5), the upper convex portion is welded to the side wall of the upper cover plate (4), a welding hole is provided on the side wall of the middle cover plate (6) corresponding to the upper convex portion, a welding hole is provided on the side wall of the upper inner plate (5) corresponding to the left convex portion and the lower convex portion, and a welding groove (9) is provided on the side wall of the upper inner plate (5) corresponding to the right convex portion, and the welding groove (9) extends out of the covering surface of the middle cover plate (6) on the upper inner plate (5).

2. The rear upper section assembly according to claim 1, characterized in that: The end of the right side convex portion of the back door mounting plate (2) is flush with the side wall of the middle cover plate (6).

3. The rear upper section assembly according to claim 1, characterized in that: It also includes a first partition plate (10) and a second partition plate (11), the outer wall of the rear end of the middle cover plate (6) is connected to the inner wall of the front end of the lower cover plate (7), the inner wall of the rear end of the upper inner plate (5) is connected to the outer wall of the front end of the lower inner plate (8), and a second hollow channel is formed between the inner wall of the lower inner plate (8) and the inner wall of the lower cover plate (7); The first partition plate (10) and the second partition plate (11) are respectively located at the head and tail ends of the second hollow channel, the side edge of the first partition plate (10) is connected to the inner wall of the head end of the middle cover plate (6) and the lower cover plate (7), and the side edge of the second partition plate (11) is connected to the inner wall of the tail end of the lower inner plate (8) and the lower cover plate (7).

4. The rear upper section assembly according to claim 3, characterized in that: The side edges of the first partition (10) are connected to the upper welding plate portion, the left welding plate portion and the right welding plate portion; The upper welding plate portion and the left welding plate portion of the first partition plate (10) are stacked with the rear end side wall of the middle cover plate (6) and the front end side wall of the lower cover plate (7), and the right welding plate portion of the first partition plate (10) is connected to the side wall of the lower inner plate (8).

5. The rear upper section assembly according to claim 4, characterized in that: It also includes a bracket (14), wherein the connecting portion of the bracket (14) is in contact with the outer wall of the lower inner plate (8); The side of the first partition (10) is also connected to the lower welding plate portion, and the lower welding plate portion of the first partition (10), the lower inner plate (8) and the connecting portion of the bracket (14) are arranged in a stacked manner.

6. The rear upper section assembly according to claim 3, characterized in that: The side edges of the second partition (11) are connected to a first extension portion, a second extension portion, a third extension portion and a fourth extension portion which are arranged circumferentially; The first extension portion and the second extension portion are both connected to the inner wall of the lower cover plate (7), and the third extension portion and the fourth extension portion are both connected to the inner wall of the lower inner plate (8). The first extension portion and the fourth extension portion both extend toward the side facing away from the second hollow channel, and the second extension portion and the third extension portion both extend toward the side facing the second hollow channel.

7. The rear upper section assembly according to claim 3, characterized in that: Also includes a third partition (12) and a fourth partition (13); A third hollow inner cavity is formed between the upper inner plate (5) and the upper cover plate (4), and the third hollow inner cavity includes a first port and a second port. The side of the third partition plate (12) is in contact with the inner walls of the upper inner plate (5) and the upper cover plate (4) to form a blockage for the first port. The side of the fourth partition plate (13) is in contact with the inner walls of the upper inner plate (5) and the upper cover plate (4) to form a blockage for the second port.

8. The rear upper section assembly according to claim 7, characterized in that: The sides of the third partition plate (12) and the fourth partition plate (13) are connected to a plurality of first welded plate portions that are fitted with the inner wall of the upper inner plate (5), and a plurality of second welded plate portions that are fitted with the inner wall of the upper cover plate (4); The first welding plate portion extends toward one side of the hollow inner cavity, and the second welding plate portion extends away from one side of the hollow inner cavity.

9. The rear upper section assembly according to claim 8, characterized in that: The side walls of the spring mounting plate (1), the first partition plate (10), the second partition plate (11), the third partition plate (12), and the fourth partition plate (13) are all provided with weight-reducing holes.

10. The rear upper section assembly according to any one of claims 1 to 9, characterized in that: The outer plate assembly comprises an outer lower plate (15) and a connecting plate (16); One end of the connecting plate (16) is connected to the outer edge lower plate (15), and the other end is connected to the side of the lower cover plate (7) and the middle cover plate (6). The side wall of the connecting plate (16) is provided with a first through hole (1601) and a second through hole (1602). The welding point of the lower cover plate (7) and the lower inner plate (8) is aligned with the first through hole (1601), and the welding point of the inner plate body (3) and the upper inner plate (5) is aligned with the second through hole (1602).

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