A car CD pillar frame structure

Abstract

This invention discloses a car CD pillar frame structure, characterized by: comprising a left side inner panel rear upper section inner panel assembly, wherein the left side inner panel rear upper section inner panel assembly includes a left side inner panel rear upper section sub-assembly, a left C-pillar reinforcing plate assembly, and a left side inner panel sub-assembly. A triangular structure is provided in the middle of the left side inner panel sub-assembly, and the left side inner panel rear upper section sub-assembly is connected to one side of the long side of the upper triangular structure on the left side inner panel sub-assembly. The left side inner panel rear upper section sub-assembly, the left C-pillar reinforcing plate assembly, and the left side inner panel sub-assembly are connected together by welding. The force transmission structures of the C-pillar and D-pillar are continuous and complete. While ensuring the continuity and integrity of the vehicle body structure, the structure improves the cavity support of the key sensitive areas of the CD pillar, thereby enhancing the vehicle body's modal structure and stiffness.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of automobile manufacturing, and particularly relates to an automobile CD column frame structure. BACKGROUND

[0002] Based on the continuous development of automobiles, users have increasingly high requirements for the ride comfort of automobiles, which puts higher requirements on the modal of the automobile body. The existing technology and structure are relatively simple, the modal and stiffness of the automobile body are low, the NVH performance requirements are not met, and the ride comfort is affected.

[0003] The CD column joint part of the traditional SUV CD column structure often uses the way of increasing the material stiffness and thickness to increase the stiffness modal. In view of the complexity of the side wall parts and the weight requirements of the automobile body, the traditional way not only is difficult to meet the performance requirements, but also greatly increases the weight of the automobile body, thereby increasing the fuel consumption and causing additional economic burden to the customers.

[0004] Through retrieval, it is found that the Chinese utility model patent with the patent number CN 214057713 U disclosed on August 27, 2021 discloses a CD column reinforcing connection structure, a rear wheel cover connecting assembly and a vehicle, which comprises a C column reinforcing plate, a D column reinforcing plate and a reinforcing connecting plate; the C column reinforcing plate comprises a main body part and an extension part; one end of the D column reinforcing plate is connected with one end of the extension part, and the reinforcing connecting plate is connected between the D column reinforcing plate and the main body part; a window is surrounded between the reinforcing connecting plate, the main body part, the extension part and the D column reinforcing plate. However, the above technical problems cannot be better solved. SUMMARY

[0005] In view of the deficiencies in the prior art, the purpose of the present application is to provide an automobile CD column frame structure which is simple in structure and effectively improves the stiffness and modal of the automobile body. Under the premise of ensuring the continuity and integrity of the automobile body structure, the cavity support of the key sensitive area of the CD column is improved to achieve the purpose of improving the modal and stiffness of the automobile body.

[0006] To achieve the above purpose, the technical scheme of the present application is as follows: an automobile CD column frame structure, comprising a left side wall inner plate rear upper section inner plate assembly, the left side wall inner plate rear upper section inner plate assembly comprising a left side wall inner plate rear upper section sub-assembly, a left C column reinforcing plate assembly and a left side wall inner plate sub-assembly, a triangular structure is arranged in the middle of the left side wall inner plate sub-assembly, the left side wall inner plate rear upper section sub-assembly is connected to one side of the long side of the upper triangular structure of the left side wall inner plate sub-assembly, and the left C column reinforcing plate assembly is connected to the other side of the long side of the upper triangular structure of the left side wall inner plate sub-assembly.

[0007] Further, the left side wall inner plate rear part upper segment subassembly comprises a left C column upper connecting plate and a left rear roof crossbeam upper connecting plate, the side part of the left C column upper connecting plate and the left rear roof crossbeam upper connecting plate is provided with a turn-up I and a turn-up II respectively, the turn-up I is located on the left C column upper connecting plate and is attached to the side part of the left rear roof crossbeam upper connecting plate in connection, and the turn-up II is located on the left rear roof crossbeam upper connecting plate and is attached to the left C column upper connecting plate in connection.

[0008] Further, the left side wall inner plate subassembly comprises a left rear roof crossbeam lower connecting plate and a reinforced rubber block, the left C column upper connecting plate and the left rear roof crossbeam upper connecting plate are connected between the left side wall inner plate subassembly and the left rear roof crossbeam lower connecting plate to form a cavity, and the reinforced rubber block is arranged in the cavity and is connected to the left rear roof crossbeam lower connecting plate.

[0009] Further, the left side wall inner plate subassembly further comprises a left C column inner plate and a left D column reinforcing plate, the left C column inner plate is connected to one side of the left rear roof crossbeam lower connecting plate through welding, the left D column reinforcing plate is connected to the other side of the left rear roof crossbeam lower connecting plate through welding, the left C column inner plate is a bending structure, the other end of the left C column inner plate is connected to the left D column reinforcing plate and the other side of the left rear roof crossbeam lower connecting plate, and the left C column inner plate and the left D column reinforcing plate are connected to the middle part of the left rear roof crossbeam lower connecting plate to form a triangular structure.

[0010] Further, the left side wall inner plate subassembly further comprises a left C column upper partition plate and a left D column upper partition plate, the left C column upper partition plate is welded at the connection between the left C column inner plate and the left rear roof crossbeam lower connecting plate, and the left D column upper partition plate is welded at the connection between the left D column reinforcing plate and the left rear roof crossbeam lower connecting plate.

[0011] Further, the left rear roof crossbeam lower connecting plate is a T-shaped structure, the cavity formed by the left C column upper connecting plate and the left rear roof crossbeam upper connecting plate on the left side wall inner plate subassembly and the left rear roof crossbeam lower connecting plate is a three-way cavity, and the reinforced rubber block, the left C column upper partition plate and the left D column upper partition plate are respectively located in the three cavities of the three-way cavity.

[0012] Further, the left C column reinforcing plate subassembly comprises a left lock buckle mounting plate, a left C column reinforcing plate and a left C column reinforcing plate upper connecting plate, the left C column reinforcing plate upper connecting plate is welded on the left C column reinforcing plate to form a Y-shaped structure, and the left lock buckle mounting plate is connected to the lower part of the left C column reinforcing plate.

[0013] Further, the left C column reinforcing plate subassembly is welded on the left side wall inner plate subassembly, and a cavity structure is formed between the left C column reinforcing plate and the left C column reinforcing plate upper connecting plate and the left C column inner plate.

[0014] Further, the left side wall inner plate subassembly further comprises a left C column lower partition plate, the left C column lower partition plate is installed on the left C column inner plate, and the left C column lower partition plate is located in the cavity formed by the left C column reinforcing plate and the upper connecting plate of the left C column reinforcing plate and the left C column inner plate.

[0015] Further, the left side wall inner plate subassembly further comprises a left C column lower partition plate, the left C column lower partition plate is installed on the left C column inner plate, and the left C column lower partition plate is located in the cavity formed by the left C column reinforcing plate and the upper connecting plate of the left C column reinforcing plate and the left C column inner plate.

[0016] The advantages of the technical scheme of the present application are as follows:

[0017] 1. The present application creates a CD column frame structure which effectively improves the rigidity and modal of the vehicle body. Firstly, the force transmission structure of the C column and the D column is continuous and complete, secondly, the joint inside the D column is increased by lapping, and the joint is further increased by a partition plate in front, which improves the torsional performance of the whole vehicle; and thirdly, the C column reinforcing plate is strengthened at the lock buckle. The purpose of improving the modal and rigidity of the vehicle body is achieved. The present application has simple process and meets the comfort and economic needs of users.

[0018] 2. The present application constructs a continuous D column and C column cross-section structure, so that the force transmission structure of the C column and the D column is continuous and complete, which ensures the continuity and integrity of the vehicle body force transmission structure; the D ring joint part is divided into parts, and the cavity support connection is added, which effectively resists deformation and improves the rigidity modal; the joint inside the D column is increased by lapping, and the joint is further increased by a partition plate in front, which improves the torsional performance of the whole vehicle; the C column reinforcing plate comprises a lock buckle reinforcing plate, and the C column lock buckle is strengthened, which effectively improves the strength; the present application improves the rigidity and modal of the whole vehicle while ensuring the layout of the vehicle interior modeling and the back door opening width, reduces the weight of the vehicle body, and meets the comfort and economic needs of users.

[0019] 3. Under the premise of ensuring the continuity and integrity of the vehicle body structure, the present application improves the cavity support of the key sensitive area of the CD column, so as to improve the modal and rigidity of the vehicle body. The present application improves the rigidity and modal of the whole vehicle, has simple process, and meets the comfort and economic needs of users. BRIEF DESCRIPTION OF DRAWINGS

[0020] The present application will be further described in detail below in combination with the drawings and specific embodiments:

[0021] Figure 1 It is a left side view schematic diagram of the left side wall inner plate rear upper section inner plate assembly of the present application;

[0022] Figure 2 It is an axial view schematic diagram of the left side wall inner plate rear upper section inner plate assembly of the present application;

[0023] Figure 3 It is a welding subassembly schematic diagram of the left side wall inner plate rear upper section inner plate assembly of the present application;

[0024] Figure 4 It is the explosion schematic view of left side wall inner plate rear upper section sub-assembly of the present application;

[0025] Figure 5 It is the explosion schematic view of left C column reinforcing plate assembly of the present application;

[0026] Figure 6 It is the explosion schematic view of left side wall inner plate sub-assembly of the present application.

[0027] The marks in the above figures are respectively: 1, left side wall inner plate rear upper section inner plate assembly; 2, left side wall inner plate rear upper section sub-assembly; 3, left C column reinforcing plate assembly; 4, left side wall inner plate sub-assembly; 5, left C column upper connecting plate; 51, flange I; 6, left rear top cross beam upper connecting plate; 61, flange II; 7, left lock buckle mounting plate; 8, left C column reinforcing plate; 9, left C column reinforcing plate upper connecting plate; 10, C column inner plate; 11, left C column upper partition plate; 12, left rear top cross beam lower connecting plate; 13, reinforced rubber block; 14, left rear back door hinge mounting plate; 15, left side air spring mounting plate; 16, left D column upper partition plate; 17, left D column reinforcing plate; 18, left C column lower partition plate. DETAILED DESCRIPTION

[0028] In the present application, it is necessary to understand that the terms "length"; "width"; "upper"; "lower"; "front"; "rear"; "left"; "right"; "vertical"; "horizontal"; "top"; "bottom"; "inner"; "outer"; "clockwise"; "counterclockwise"; "axial"; "planar direction"; "circumferential direction" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the indicated device or element must have a particular orientation; be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0029] In the automobile industry, in the automobile glass containing a curtain, a front windshield glass part, these glass parts fixed on the vehicle body have gaps between them when matched with the interior trim parts in the vehicle arrangement, and have distributed cavities inside; in the vehicle environment, considering the arrangement of the vehicle space, considering the applicability of the hanging structure, so by using the structure of the whole vehicle arrangement, comprehensively considering that this rear hanging structure can utilize the arrangement on the whole vehicle.

[0030] As Figures 1 to 6As shown, a car CD column frame structure is characterized by comprising a left side wall inner plate rear upper section inner plate assembly 1, the left side wall inner plate rear upper section inner plate assembly 1 comprising a left side wall inner plate rear upper section sub-assembly 2, a left C column reinforcing plate assembly 3 and a left side wall inner plate sub-assembly 4, the middle of the left side wall inner plate sub-assembly 4 being provided with a triangular structure, the left side wall inner plate rear upper section sub-assembly 2 being connected to one side of the long side of the triangular structure of the left side wall inner plate sub-assembly 4, and the left C column reinforcing plate assembly 3 being connected to the other side of the long side of the triangular structure of the left side wall inner plate sub-assembly 4. The left side wall inner plate rear upper section sub-assembly 2, the left C column reinforcing plate assembly 3 and the left side wall inner plate sub-assembly 4 are connected together by welding. The C column and D column force transmission structure are continuous and complete, and under the premise of ensuring the continuity and integrity of the vehicle body structure, the purpose of improving the modal and stiffness of the vehicle body is achieved by improving the cavity support of the key sensitive area of the CD column.

[0031] The left side wall inner plate rear upper section sub-assembly 2 comprises a left C column upper connecting plate 5 and a left rear top cross beam upper connecting plate 6, and the side of the left C column upper connecting plate 5 and the left rear top cross beam upper connecting plate 6 connected to each other is respectively provided with a flange I 51 and a flange II 61, the flange I 51 is located on the left C column upper connecting plate 5 and is in contact with the side of the left rear top cross beam upper connecting plate 6 during connection, and the flange II 61 is located on the left rear top cross beam upper connecting plate 6 and is in contact with the left C column upper connecting plate 5 during connection. The left C column upper connecting plate 5 and the left rear top cross beam upper connecting plate 6 are connected together by welding on the side surface, thereby playing a reinforcing connection role in the Z direction.

[0032] The left side wall inner plate sub-assembly 4 comprises a left rear top cross beam lower connecting plate 12 and a reinforcing rubber block 13, the left C column upper connecting plate 5 and the left rear top cross beam upper connecting plate 6 are connected between the left side wall inner plate sub-assembly 4 and the left rear top cross beam lower connecting plate 12 to form a cavity, the reinforcing rubber block 13 is arranged in the cavity, and the reinforcing rubber block 13 is connected to the left rear top cross beam lower connecting plate 12.

[0033] The left side wall inner plate sub-assembly 4 further comprises a left C column inner plate 10 and a left D column reinforcing plate 17, the left C column inner plate 10 is connected to one side of the left rear top cross beam lower connecting plate 12 by welding, the left D column reinforcing plate 17 is connected to the other side of the left rear top cross beam lower connecting plate 12 by welding, the left C column inner plate 10 is a bent structure, the other end of the left C column inner plate 10 is connected to the left D column reinforcing plate 17 and the other side of the left rear top cross beam lower connecting plate 12, and the left C column inner plate 10 and the left D column reinforcing plate 17 are connected to the middle of the left rear top cross beam lower connecting plate 12 to form a triangular structure, i.e., a triangular window.

[0034] The left side inner panel subassembly 4 further comprises a left C-pillar upper partition plate 11 and a left D-pillar upper partition plate 16, the left C-pillar upper partition plate 11 is welded at the joint of the left C-pillar inner panel 10 and the left rear top cross beam lower connecting plate 12, and the left D-pillar upper partition plate 16 is welded at the joint of the left D-pillar reinforcing plate 17 and the left rear top cross beam lower connecting plate 12.

[0035] The left rear top cross beam lower connecting plate 12 is of a T-shaped structure, the left C-pillar upper connecting plate 5 and the left rear top cross beam upper connecting plate 6 are connected to the left side inner panel subassembly 4 to form a three-way cavity with the left rear top cross beam lower connecting plate 12, and the reinforcing rubber block 13, the left C-pillar upper partition plate 11 and the left D-pillar upper partition plate 16 are respectively located in the three cavities of the three-way cavity, that is, the reinforcing rubber block 13, the left C-pillar upper partition plate 11 and the left D-pillar upper partition plate 16 are all located in the cavity formed by the left C-pillar upper connecting plate 5, the left rear top cross beam upper connecting plate 6 and the left rear top cross beam lower connecting plate 12.

[0036] The left C-pillar reinforcing plate assembly 3 comprises a left lock buckle mounting plate 7, a left C-pillar reinforcing plate 8 and a left C-pillar reinforcing plate upper connecting plate 9, the left C-pillar reinforcing plate upper connecting plate 9 is welded on the left C-pillar reinforcing plate 8 to form a Y-shaped structure, and the left lock buckle mounting plate 7 is connected to the lower part of the left C-pillar reinforcing plate 8. The lock buckle is in the reinforcing plate, and the strength of the lock buckle is obviously improved.

[0037] The left C-pillar reinforcing plate assembly 3 is welded on the left side inner panel subassembly 4, and the left C-pillar reinforcing plate 8 and the left C-pillar reinforcing plate upper connecting plate 9 form a cavity structure with the left C-pillar inner panel 10. The left side inner panel subassembly 4 further comprises a left C-pillar lower partition plate 18, the left C-pillar lower partition plate 18 is mounted on the left C-pillar inner panel 10, and the left C-pillar lower partition plate 18 is located in the cavity formed by the left C-pillar reinforcing plate 8, the left C-pillar reinforcing plate upper connecting plate 9 and the left C-pillar inner panel 10. The partition plates in the application are connected by process holes, and the partition plates can well strengthen the cross section of the cavity.

[0038] The left side inner panel subassembly 4 further comprises a left rear back door hinge mounting plate 14 and a left side gas spring mounting plate 15, and the left rear back door hinge mounting plate 14 and the left side gas spring mounting plate 15 are connected on the left rear top cross beam lower connecting plate 12 by welding.

[0039] By finite element model multi-scheme comparison and part sensitivity analysis, the weakness of the whole vehicle torsional mode is found out, and targeted strengthening is carried out. In summary, the present application provides a rear top cross beam upper connecting plate sub-assembly scheme, specifically: taking the X direction boundary of the back door hinge as the reference, the rear top cross beam upper connecting plate at the three-way position of the CD column and the rear top cross beam assembly is divided into front and rear two parts, namely the left C column upper connecting plate 5 and the left rear top cross beam upper connecting plate (6). The front part of the left C column upper connecting plate is increased by a Z direction vertical surface, and is welded with the rear top cross beam lower connecting plate 12 to form a cavity support surface; the rear part of the left rear top cross beam upper connecting plate is increased by a flange surface welded with the left C column upper connecting plate to increase the connecting stiffness. The left C column upper connecting plate and the left rear top cross beam upper connecting plate are pre-welded with 11 welding points, the left rear top cross beam upper connecting plate is welded with a through hole, and the left C column upper connecting plate and the left rear top cross beam lower connecting plate are overlapped with 4 welding points, and the remaining overlapping positions are coated with structural adhesive to ensure the stiffness of the connection.

[0040] The present application also provides a scheme of adding a partition plate in the D ring cavity cross section, specifically: a left C column upper partition plate 11 is added between the front boundary position of the left C column upper connecting plate (5) and the left C column inner plate 10, and a left D column upper partition plate 16 is added between the rear boundary position of the left rear top cross beam upper connecting plate 12 and the left D column reinforcing plate 17; the left C column upper connecting plate 5 and the left C column upper partition plate 11 are pre-welded with 3 welding points, and the left rear top cross beam upper connecting plate 12 and the left D column reinforcing plate 17 are pre-welded with 2 welding points. The upper part of the rear part of the left side wall inner plate is divided into two assemblies 2 in a Z direction downward falling manner, the left C column upper partition plate 11 is overlapped with the left C column inner plate 10 and welded with 3 welding points, and the left D column upper partition plate 16 is overlapped with the left D column reinforcing plate 17 and welded with 4 welding points, to increase the connection between the reinforcing plate and the inner plate support

[0041] The present application creates a CD column frame structure which effectively improves the stiffness and mode of the vehicle body. Firstly, the C column and D column force transmission structure is continuous and complete, secondly, the joint inside the D column is overlapped, and the joint front is increased by a partition plate, to improve the torsional performance of the whole vehicle; and thirdly, the C column reinforcing plate lock is strengthened. The purpose of improving the stiffness and mode of the vehicle body is achieved. The present application has simple process, and meets the comfort and economic needs of users.

[0042] The present application constructs a continuous D column and C column cross section structure, so that the C column and D column force transmission structure is continuous and complete, to ensure the continuity and integrity of the vehicle body force transmission structure; the D ring joint part is divided into sub-assemblies, and the cavity support connection is added, to effectively resist deformation and improve the stiffness mode; the joint inside the D column is overlapped, and the joint front is increased by a partition plate, to improve the torsional performance of the whole vehicle; the C column reinforcing plate includes a lock reinforcing plate, and the C column lock is strengthened, to effectively improve the strength; the present application ensures the layout of the vehicle interior modeling and the back door opening width while improving the stiffness and mode of the whole vehicle, reducing the weight of the vehicle body, and meeting the comfort and economic needs of users.

[0043] The application improves the rigidity and mode of the whole vehicle, has simple process, and meets the comfort and economy requirements of users.

[0044] The application is described above in combination with the drawings, and it is obvious that the specific implementation of the application is not limited by the above method, and various non-essential improvements are made by using the technical scheme of the application, or the concept and technical scheme of the application are directly applied to other occasions without improvement, which are all within the protection scope of the application.

Claims

1. An automotive CD pillar frame structure, characterized by: The left side wall inner plate rear upper section assembly (1) comprises a left side wall inner plate rear upper section sub-assembly (2), a left C column reinforcing plate assembly (3) and a left side wall inner plate sub-assembly (4), the middle of the left side wall inner plate sub-assembly (4) is provided with a triangular structure, the left side wall inner plate rear upper section sub-assembly (2) is connected to one side of the long side of the triangular structure of the left side wall inner plate sub-assembly (4), and the left C column reinforcing plate assembly (3) is connected to the other side of the long side of the triangular structure of the left side wall inner plate sub-assembly (4).

2. The automotive CD pillar frame structure of claim 1, wherein: The left side wall inner plate sub-assembly (4) comprises a left C column inner plate (10), a left rear top cross beam lower connecting plate (12) and a left D column reinforcing plate (17), the left C column inner plate (10) is connected to one side of the left rear top cross beam lower connecting plate (12) through welding, the left D column reinforcing plate (17) is connected to the other side of the left rear top cross beam lower connecting plate (12) through welding, the left C column inner plate (10) is a bending structure, the other end of the left C column inner plate (10) is connected to the left D column reinforcing plate (17) and the other side of the left rear top cross beam lower connecting plate (12), and the left C column inner plate (10) and the left D column reinforcing plate (17) are connected to the middle of the left rear top cross beam lower connecting plate (12) to form a triangular structure.

3. The automotive CD pillar frame structure of claim 2, wherein: The left side wall inner plate rear upper section sub-assembly (2) comprises a left C column upper connecting plate (5) and a left rear top cross beam upper connecting plate (6), the side, where the left C column upper connecting plate (5) and the left rear top cross beam upper connecting plate (6) are connected, is respectively provided with a turn-up I (51) and a turn-up II (61), the turn-up I (51) is located on the left C column upper connecting plate (5) and is attached to the side of the left rear top cross beam upper connecting plate (6) during connection, and the turn-up II (61) is located on the left rear top cross beam upper connecting plate (6) and is attached to the left C column upper connecting plate (5) during connection.

4. The automotive CD pillar frame structure of claim 3, wherein: The left side wall inner plate sub-assembly (4) comprises a reinforcing rubber block (13), the left C column upper connecting plate (5) and the left rear top cross beam upper connecting plate (6) are connected between the left side wall inner plate sub-assembly (4) and the left rear top cross beam lower connecting plate (12) to form a cavity, the reinforcing rubber block (13) is arranged in the cavity, and the reinforcing rubber block (13) is connected to the left rear top cross beam lower connecting plate (12).

5. The automotive CD pillar frame structure of claim 4, wherein: The left side wall inner plate sub-assembly (4) further comprises a left C column upper partition plate (11) and a left D column upper partition plate (16), the left C column upper partition plate (11) is welded at the connection position of the left C column inner plate (10) and the left rear top cross beam lower connecting plate (12), and the left D column upper partition plate (16) is welded at the connection position of the left D column reinforcing plate (17) and the left rear top cross beam lower connecting plate (12). The left rear top cross beam lower connecting plate (12) is a T-shaped structure, the cavity formed by the left C column upper connecting plate (5) and the left rear top cross beam upper connecting plate (6) and the left rear top cross beam lower connecting plate (12) on the left side wall inner plate sub-assembly (4) is a three-way cavity, and the reinforcing rubber block (13), the left C column upper partition plate (11) and the left D column upper partition plate (16) are respectively arranged in the three cavities of the three-way cavity.

6. The automotive CD pillar frame structure of claim 4, wherein: The left C-column reinforcement plate assembly (3) comprises a left lock buckle mounting plate (7), a left C-column reinforcement plate (8) and a left C-column reinforcement plate upper connecting plate (9), the left C-column reinforcement plate upper connecting plate (9) is welded on the left C-column reinforcement plate (8) to form a Y-shaped structure, and the left lock buckle mounting plate (7) is connected to the lower part of the left C-column reinforcement plate (8).

7. A vehicle CD pillar framework structure according to claim 6, characterized by: The left C-column reinforcement plate assembly (3) is welded on the left side wall inner panel sub-assembly (4), and a cavity structure is formed between the left C-column reinforcement plate (8), the left C-column reinforcement plate upper connecting plate (9) and the left C-column inner panel (10).

8. A vehicle CD pillar framework structure according to claim 7, characterized by: The left side wall inner panel sub-assembly (4) further comprises a left C-column lower partition plate (18), the left C-column lower partition plate (18) is mounted on the left C-column inner panel (10), and the left C-column lower partition plate (18) is located in the cavity formed by the left C-column reinforcement plate (8), the left C-column reinforcement plate upper connecting plate (9) and the left C-column inner panel (10).

9. The automotive CD pillar frame structure of claim 8, wherein: The left side wall inner panel sub-assembly (4) further comprises a left rear back door hinge mounting plate (14) and a left gas spring mounting plate (15), and the left rear back door hinge mounting plate (14) and the left gas spring mounting plate (15) are connected to the left rear top cross beam lower connecting plate (12) by welding.

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