Body structure of the rear door opening

Abstract

A vehicle body structure for a rear door opening, by changing the vehicle body structure of the rear door opening, strengthens the stiffness and strength of the lower part of the opening. The vehicle body structure includes a D-pillar member and a cross beam. The D-pillar member is arranged to form a closed cross-sectional structure and is vertically installed on each side of both sides of the rear door opening. The cross beam is installed at the lower part of the rear door opening along the left-right direction, and includes side parts at both ends of the cross beam. Specifically, the side parts are inserted into the lower ends of the D-pillar member, so that the side parts are surrounded and connected by the inner surfaces of the lower ends of the D-pillar member to form a closed cross-sectional structure.

Description

Technical Field

[0001] The present application relates to a vehicle body structure of a rear door opening, and by changing the vehicle body structure of the rear door opening, it can strengthen the rigidity and strength of the lower part of the opening. Background Art

[0002] The statements in this section only provide background information related to the present application and do not constitute prior art.

[0003] An opening is formed at the rear side of a sport utility vehicle (SUV) or a multi-purpose vehicle (MPV) to facilitate loading of items, and the opening is arranged to be opened and closed at the rear door.

[0004] However, when such a vehicle is parked with only one front wheel on the curb, it is found that the deformation degree of the vehicle body at the lower part of the opening is too large, resulting in the inability to close the rear door. In addition, due to the insufficient overall rigidity of the vehicle body, it is difficult to meet the durability performance of the vehicle body.

[0005] In particular, when a four-row pop-up and sinking seat is used in such a vehicle, it becomes more important to ensure the rigidity of the lower part of the rear door opening, so a vehicle body structure that can strengthen the rigidity and strength of the lower part of the opening is required.

[0006] The above content is only intended to help understand the background of the present application and is not intended to indicate that the present application falls within the scope of the prior art known to those skilled in the art. Summary of the Invention

[0007] The present application provides a vehicle body structure of a rear door opening, and by changing the vehicle body structure of the rear door opening, it can strengthen the rigidity and strength of the lower part of the opening.

[0008] According to one aspect, the vehicle body structure includes a D-pillar member and a cross beam. The D-pillar member is arranged to form a closed cross-sectional structure and is vertically installed on each side of both sides of the rear door opening. The cross beam is installed at the lower part of the rear door opening along the left-right direction of the vehicle body structure, and includes side parts at both ends. The side parts are inserted in such a way that the side parts are surrounded by the inner surface of the lower end of the D-pillar member to form a closed cross-sectional structure and are connected to the inner surface of the D-pillar member.

[0009] The vehicle body structure may further include a rear panel and a cover member. The rear panel is installed along the left-right direction to cover the rear side and the lower side of the cross beam. The cover member is connected to block the lower end and the side parts of the cross beam and is connected between the rear panel and the rear wheel cover plate.

[0010] The cover member may include a connecting member and a reinforcing member; the connecting member has a middle portion, a rear end, and a front end, the upper surface of the middle portion is coupled to the lower end of the side portion of the cross member, the rear end is coupled to the end portion of the rear panel, and the front end is coupled to the rear end of the rear wheel cover; the rear side of the reinforcing member is covered by the rear panel, wherein the upper end portion is formed to bend toward the corner space formed between the connecting member and the side portion of the cross member, so that the bent portion is coupled to the connecting member and the side portion of the cross member while blocking the corner space.

[0011] The outer column member constituting the outer surface of the D-pillar member may be formed to extend downward and coupled in a form covering the outer surface of the connecting member; and the rear end of the outer column member may be coupled to the end portion of the rear end of the rear panel, and its front end may be coupled to the rear end of the rear wheel cover.

[0012] The upper and lower ends of the connecting member may be formed to bend outward; and a closed cross-sectional space may be formed between the outer surface of the middle portion of the connecting member and the inner surface of the outer column member.

[0013] The vehicle body structure may further include a rear floor panel, a longitudinal beam, and a support member; the rear floor panel is disposed to form the bottom surface of the vehicle interior inside the rear door opening, and both sides of the rear side are formed to extend rearward toward the reinforcing member; the longitudinal beam is coupled at both sides of the lower portion of the rear floor panel in the front-rear direction; the support member is supported on the rear floor panel between the cross member and the longitudinal beam and is coupled to the connecting member.

[0014] The support member may include a first support member and a second support member; the first support member has an upper end and a lower end, the upper end is coupled and supported on the bottom surface of the side portion of the cross member, and the lower end is coupled to the upper surface of the rear floor panel; the second support member is coupled to the upper surface of the rear floor panel and is formed in a shape covering the front side of the first support member to be coupled to the lower end of the side portion of the cross member and the inner surface of the connecting member.

[0015] The first support member is formed such that the supports on both sides of the first support member have a downwardly bent U-shaped cross section; the longitudinal beam is formed such that the supports on both sides of the longitudinal beam have an upwardly bent U-shaped cross section; the lower end of the support of the first support member and the upper end of the support of the longitudinal beam may be connected to corresponding positions with the rear floor panel interposed therebetween.

[0016] The support of the first support member and the support of the longitudinal beam may be vertically connected.

[0017] The annular diaphragm can be connected along the inner surface and the edge of the side part of the cross beam; and the lower end of the diaphragm can be supported on the side part of the cross beam, and the side part of the cross beam is connected to the upper end of the first support member.

[0018] The side end part of the second support member can be formed to extend upward and laterally to be connected to the lower end of the side part of the cross beam and the inner surface of the connecting member.

[0019] The second support member can be formed into a shape that blocks the front side of the first support member, so as to form a quadrilateral first closed cross-sectional space in the front-rear direction; the extension part extending from the side end part of the second support member can be formed into a shape that blocks the space between the first support member, the cross beam, the side part and the connecting member at the front side, so as to form a quadrilateral second closed cross-sectional space in the front-rear direction; the quadrilateral first closed cross-sectional space and the quadrilateral second closed cross-sectional space can be formed in parallel between the cross beam, the side part and the rear floor panel in the left-right direction.

[0020] An annular column diaphragm can be connected along the edge of the inner surface of the D-column member; the lower end of the annular column diaphragm can be connected to the end part of the side part of the cross beam, and the end part of the side part of the cross beam is connected to the inside of the D-column member.

[0021] Through the description provided herein, further application fields will become clear. It should be understood that the description and specific examples are for illustrative purposes only and are not intended to limit the scope of the present application. Description of the Drawings

[0022] In order to clearly understand the present application, various forms thereof will now be described by way of example with reference to the drawings, in which:

[0023] Figure 1 It is a view showing a vehicle body structure forming a back door opening in one form of the present application;

[0024] Figure 2 It is a view for explaining a connection structure between a cross beam and a D-column member according to another form of the present application;

[0025] Figure 3 It is a view showing a vehicle body connection structure at the corner of the lower end of a back door opening according to one form of the present application;

[0026] Figures 4 to 6 It is a view showing the shapes in which the side part of a cross beam, a connecting member and a reinforcing member are connected at different positions respectively according to some forms of the present application;

[0027] Figure 7A diagram showing the connection relationship between a connecting member and a reinforcing member according to one form of the present application;

[0028] Figure 8 A diagram for explaining the shape and connection relationship of an outer member of a column according to one form of the present application;

[0029] Figure 9 A diagram for explaining a closed cross-sectional space formed by connecting a connecting member to an outer member of a column according to one form of the present application;

[0030] Figure 10 A diagram showing the connection relationship between a support member, the side of a crossbeam, and a connecting member according to one form of the present application;

[0031] Figure 11 A diagram showing the shape of a support member and a longitudinal beam connected to the upper and lower parts of a rear floor panel as viewed from the rear according to one form of the present application;

[0032] Figure 12 A diagram showing the shape of a support member and a longitudinal beam connected to the upper and lower parts of a rear floor panel as viewed from the rear according to one form of the present application;

[0033] Figure 13 A diagram for explaining the cross-sectional connection structure between a support member and a longitudinal beam and the structure with a diaphragm connected according to one form of the present application;

[0034] Figure 14 A diagram for explaining the structure with a column partition connected according to one form of the present application;

[0035] The drawings described herein are for illustrative purposes only and are not intended to limit the scope of the present application in any way. Detailed Description

[0036] The following description is merely exemplary and is not intended to limit the present application, its application, or its use. It should be understood that in the drawings, corresponding reference numerals refer to equivalent or corresponding components and features.

[0037] Exemplary forms of the present invention will be described below with reference to the accompanying drawings.

[0038] Figure 1 A diagram showing a vehicle body structure forming a rear door opening 10 according to one form of the present application, while Figure 2 A diagram for explaining the connection structure between a crossbeam 200 and a D-pillar member 100 in one form of the present application.

[0039] The present application relates to a vehicle body structure for strengthening the rigidity and strength of the lower part of a back door opening 10. In this structure, at the corner of the lower end of the back door opening 10, a cross member 200, a D-pillar member 100, a rear panel 300, and a cover member 500 are organically connected to each other.

[0040] Referring to the accompanying drawings for a detailed description of the present application, the D-pillar member 100 first forms a closed cross-sectional structure and is vertically installed on both sides of the back door opening 10.

[0041] In addition, the cross member 200 is installed in the lower part of the back door opening 10 in the left-right direction. The sides 210 at both ends of the cross member 200 are inserted in a form surrounded by the inside of the lower end of the D-pillar member 100, thereby forming a closed cross-sectional structure, and a structure is formed in which the sides 210 are connected to the inner surface of the D-pillar member 100.

[0042] That is to say, the cross section of the cross member 200 remains a closed cross section, bends upward from the lower end of the D-pillar member 100, passes vertically through the D-pillar member 100, and continuously extends to the end of the side wall of the D-pillar member 100, thereby realizing the cross-sectional continuity of the cross member 200 and the D-pillar member 100, and thus strengthening the rigidity and strength of the corresponding connection part.

[0043] Furthermore, Figure 3 FIG. shows the vehicle body connection structure at the corner of the lower end of the back door opening 10; while Figures 4 to 6 FIG. shows the shapes in which the cross member 200, the sides 210, the connection member 510, and the strengthening member 520 are connected at different positions respectively.

[0044] Referring to the accompanying drawings, the rear panel 300 is installed to cover the rear side and the lower side of the cross member 200 at the lower end of the opening 10 in the left-right direction. As a reference, the cross member 310 can be connected in front of the rear panel 300 in the left-right direction.

[0045] Furthermore, the cover member 500 is connected in a form that blocks the lower end of the side 210 of the cross member 200, and the formed structure makes the cover member 500 connected between the rear panel 300 and the rear wheel cover panel 400.

[0046] That is to say, the corner of the lower part of the back door opening 10 is the position where various panels and members constituting the vehicle body are connected. Since it is difficult to strengthen the vehicle body rigidity or connect the closed cross section, the corner becomes a structurally weak part.

[0047] Therefore, as Figure 3As shown, since the cross-section of the cross beam 200 is connected to the inner wall surface of the D-pillar member 100 and the cover member 500 is coupled to the lower end of the cross beam 200 in the front-rear direction and the left-right direction, at the corner of the lower end of the opening 10, cross-sectional continuity is provided in all directions of the X, Y, and Z axes, so that the concentration of stress at the corner can be effectively dispersed.

[0048] Furthermore, Figure 7 FIG. shows the connection relationship between the connecting member 510 and the reinforcing member 520. The cover member 500 can be formed as a single member. Alternatively, the cover member 500 can be arranged in a structure where the connecting member 510 and the reinforcing member 520 are coupled.

[0049] Referring to Figures 4 to 7 the description, the connecting member 510 is formed in a " " shaped cross-section. The lower end of the side portion 210 of the cross beam 200 is coupled to the upper surface of the middle portion of the connecting member 510. The rear end of the connecting member 510 is coupled to the end of the rear panel 300, and the front end of the connecting member 510 is coupled to the rear end of the rear wheel cover panel 400.

[0050] Furthermore, the rear side of the reinforcing member 520 is covered by the rear panel 300. The upper end of the reinforcing member 520 is bent into an "L" shape toward the triangular corner space SC formed between the connecting member 510 and the side portion 210 of the cross beam 200, thereby forming a bent portion 522. The bent portion 522 blocks the triangular corner space SC, so that a structure for coupling the reinforcing member 520 to the connecting member 510 and the side portion 210 of the cross beam 200 is formed. Moreover, the reinforcing member 520 is coupled in a form that covers the rear side of the longitudinal beam 700 to be described below.

[0051] That is, at the lower end of the side portion 210 of the cross beam 200, the reinforcing member 520 is welded and coupled to the side portion 210 of the cross beam 200 and the connecting member 510, thereby completely blocking the triangular corner space SC. Therefore, the cross-sectional connectivity from the cross beam 200 to the connecting member 510 is ensured, and the stiffness and strength of the corresponding connecting portion are enhanced.

[0052] Meanwhile, Figure 8 FIG. is a view for explaining the shape and connection relationship of the outer column member 110.

[0053] Referring to Figure 3 and Figure 8 the description, a part of the outer column member 110 constituting the outer surface of the D-pillar member 100 is formed to extend downward and is coupled in a form that covers a part of the outer surface of the connecting member 510.

[0054] Further, a structure is formed in which the rear end of the outer column member 110 is coupled to each of the left and right end portions of the rear plate 300, and its front end is coupled to the rear end of the rear wheel cover plate 400.

[0055] Further, the vertical cross-section of the connecting member 510 is formed in a " " shape, thereby forming a structure in which the upper and lower ends of the connecting member 510 are formed in a shape that bends outward based on the middle portion of the connecting member 510, and a closed cross-sectional space is formed between the outer surface of the middle portion of the connecting member 510 and the inner surface of the outer column member 110.

[0056] That is to say, Figure 9 is a view showing the shape of the connecting member 510 as viewed from above. The lower end of the outer column member 110 is formed to extend downward and is coupled in a form that blocks the outer portion of the connecting member 510, thereby forming a closed cross-sectional space in the region of the middle portion of the connecting member 510, and thus ensuring the connectivity of the closed cross-sectional structure along the connecting member 510. Thus, at the corner portion of the lower end of the opening 10, three box structures are realized, including two closed cross-sectional spaces formed at the rear side of the rear plate 300, thereby more effectively absorbing and dispersing the load.

[0057] At the same time, Figure 10 is a view showing the connection relationship between the support member 800, the side portion 210 of the cross member 200, and the connecting member 510, while Figure 11 and Figure 12 are views showing the shapes of the support member 800 and the longitudinal beam 700 coupled to the upper and lower portions of the rear floor panel 600 as viewed from the rear side and the front side. A structure is formed in which the support member 800 is coupled to the upper portion of the rear floor panel 600, and the longitudinal beam 700 is coupled to the lower portion of the rear floor panel 600.

[0058] As described with reference to the accompanying drawings, the rear floor panel 600 is formed to constitute the vehicle floor surface starting from the inside of the back door opening 10, and both rear side portions of the rear floor panel 600 are formed to extend along the rearward direction toward the reinforcing member 520. As a reference, the middle portion of the rear side of the rear floor panel 600 is formed to be recessed downward, so that a space for accommodating four rows of pop-up sunken panels can be formed.

[0059] Further, the longitudinal beam 700 is coupled to both sides of the lower portion of the rear floor panel 600 in the front-rear direction.

[0060] Further, a structure is formed in which, in the upper portion of the rear floor panel 600, the support member 800 is supported between the cross member 200 and the longitudinal beam 700 and is coupled to the connecting member 510.

[0061] That is to say, the rear ends on both sides of the rear floor panel 600 are formed to extend and become longer along the rearward direction and are connected to the reinforcing member 520, thereby blocking the noise introduced from the lower part of the rear floor panel 600 to the upper part along its extension, so that the sealing firmness of the vehicle body can be ensured and the waterproof performance can be improved.

[0062] Furthermore, the support member 800 is supported between the rear floor panel 600, the side portion 210, and the cross member 200, and is coupled to the inner side of the connection member 510 to improve the coupling stiffness of the cross member 200 and the connection member 510 coupled to the rear floor panel 600, so that the stiffness and strength of the corner portion at the lower end of the opening 10 can be further improved.

[0063] Furthermore, as Figure 11 and Figure 12 shown, the support member 800 can be formed as a single member. In one form, the support member 800 can be arranged in a structure where the first support member 810 and the second support member 820 are coupled.

[0064] Referring to the attached drawings, the upper end of the first support member 810 is first coupled to support the bottom surface of the side portion 210 of the cross member 200, and its lower end is coupled to the upper surface of the rear floor panel 600.

[0065] Furthermore, the second support member 820 is formed in a shape that is coupled to the upper surface of the rear floor panel 600, covering the front side of the first support member 810, so as to form a structure where the second support member 820 is coupled to the lower end of the side portion 210 of the cross member 200 and the inner surface of the connection member 510.

[0066] Specifically, the support members 812 on both sides of the first support member 810 are formed to have a downwardly curved "U" - shaped cross - section, and the support members 702 on both sides of the longitudinal beam 700 are formed to have an upwardly curved "U" - shaped cross - section.

[0067] Therefore, a structure is formed where the lower end of the support member 812 of the first support member 810 and the upper end of the support member 702 of the longitudinal beam 700 are connected to corresponding positions with the rear floor panel 600 inserted therebetween.

[0068] In another form, a structure is formed where the support member 812 of the first support member 810 and the support member 702 of the longitudinal beam 700 are vertically connected.

[0069] That is to say, Figure 13Shows the cross-sectional connection structure between the support member 800 and the longitudinal beam 700. A double support structure of the first support member 810 and the second support member 820 is applied to the longitudinal beam 700. The lower end of the support piece 812 of the first support member 810 and the upper end of the support piece 702 of the longitudinal beam 700 are vertically connected, and the rear floor panel 600 is inserted therebetween, so that the cross-sectional connectivity of the longitudinal beam 700 can be made firm.

[0070] Therefore, the connection stiffness between the components connected from the longitudinal beam 700 to the cross beam 200 is increased, so that the stiffness and strength of the corner at the lower end of the opening 10 can be enhanced.

[0071] Furthermore, referring to Figure 13 Describing the connection structure of the diaphragm 220, an annular diaphragm 220 is connected along the inner peripheral surface of the side portion 210 of the cross beam 200.

[0072] Furthermore, a structure is formed such that the lower end of the diaphragm 220 is supported on the side portion 210 of the cross beam 200, and the side portion 210 of the cross beam 200 is connected to the upper end of the first support member 810.

[0073] That is to say, the diaphragm 220 is connected along the edge of the inner surface of the cross beam 200, thereby strengthening the stiffness of the cross beam 200.

[0074] Specifically, since the lower end of the diaphragm 220 is supported on the first support member 810, the load transmitted from the longitudinal beam 700 to the cross beam 200 is transmitted to the D-pillar member 100 through the first support member 810 and the diaphragm 220, so that the load introduced from the outside of the vehicle can be more effectively dispersed.

[0075] Next, referring to Figure 10 , the side end portion of the second support member 820 is formed to extend upward and laterally, so as to form a structure in which the second support member 820 is connected to the lower end of the side portion 210 of the cross beam 200 and the inner surface of the connection member 510.

[0076] Specifically, the second support member 820 is formed in a shape that blocks the front side of the first support member 810, so as to form a quadrilateral first closed cross-sectional space S1 in the front-rear direction.

[0077] Furthermore, the extension portion 822 extending from the side end portion of the second support member 820 is formed in a shape that blocks the space between the first support member 810, the side portion 210 of the cross beam 200 and the connection member 510 at the front side, so as to form a quadrilateral second closed cross-sectional space S2 in the front-rear direction.

[0078] Therefore, a structure is formed in which a first closed cross-sectional space S1 and a second closed cross-sectional space S2 are formed in parallel in the left-right direction between the side portion 210 of the cross member 200 and the rear floor panel 600.

[0079] That is, the second support member 820 is coupled in such a manner as to surround the first support member 810 at its front side to form a closed cross-sectional space, and the second support member 820 is formed and coupled to extend toward the side portion 210 of the cross member 200 and the connection member 510 on the rear floor panel 600 to form another closed cross-sectional space.

[0080] Therefore, closed cross-sectional spaces of a two-box structure are formed in parallel between the cross member 200 and the rear floor panel 600 in the left-right direction, thereby ensuring the connectivity of the closed cross-sectional spaces. Accordingly, the coupling stiffness between the cross member 200 and the rear floor panel 600 is increased, so that the load introduced from the outside can be more effectively dispersed.

[0081] Meanwhile, Figure 14 FIG. is a view for explaining the structure to which the pillar partition 120 is coupled according to the present application.

[0082] Referring to the accompanying drawings, an annular pillar partition 120 is coupled along the edge of the inner surface of the D-pillar member 100.

[0083] Furthermore, a structure is formed in which the lower end of the pillar partition 120 is coupled to the end portion of the side portion 210 of the cross member 200, and the end portion of the side portion 210 of the cross member 200 is connected to the inside of the D-pillar member 100.

[0084] That is, the pillar partition 120 is coupled along the edge of the inner surface of the D-pillar member 100, thereby strengthening the stiffness of the cross member 200.

[0085] Specifically, the side portion 210 of the cross member 200 is supported on the lower end of the pillar partition 120, so that the concentration of stress and the load transmitted from the cross member 200 to the D-pillar member 100 can be effectively dispersed.

[0086] As described above, through the coupling structure between the members (including the cross member 200, the connection member 510, and the reinforcement member 520 at the corner of the lower end of the back door opening 10), the present application provides cross-sectional continuity in all directions of the X, Y, and Z axes, and through the improved combination between the diaphragm 220, the pillar partition 120, and the support member 800, the concentration of load and stress is effectively dispersed, thereby suppressing or preventing the deformation of the vehicle body.

[0087] Therefore, the stiffness and strength of the rear door opening 10 are enhanced, reducing or minimizing the displacement of the opening 10, thereby eliminating the cause of poor rear door closing. Further, since the overall stiffness of the rear part of the vehicle body is enhanced, the ride and handling characteristics (R&H) can be improved.

[0088] According to the present application, through the connection structure between components (including the cross member, connection member, and reinforcement member at the corner of the lower end of the rear door opening), cross-sectional continuity can be provided in all directions of the X, Y, and Z axes, and through the improved combination of the diaphragm, column partition, and support member, the concentration of load and stress can be effectively dispersed, thereby suppressing or preventing the deformation of the vehicle body.

[0089] Therefore, the stiffness and strength of the rear door opening are enhanced, enabling the displacement of the opening to be reduced or minimized, thereby eliminating the cause of poor rear door closing, and since the overall stiffness of the rear part of the vehicle body is enhanced, the R&H performance can be improved.

[0090] Meanwhile, although the present application is described only with reference to the above specific examples, those skilled in the art can obviously make various modifications and changes within the technical scope of the present application, and such modifications and changes naturally fall within the scope of the present application.

Claims

1. A vehicle body structure for a rear door opening, comprising: D-pillar members, each having a closed cross-section and vertically installed on each side of both sides of the rear door opening; A crossbeam, which is installed at the lower part of the rear door opening along the left-right direction of the vehicle body structure, and includes side portions at both ends of the crossbeam, wherein the side portions are inserted into the lower ends of the D-pillar members, so that the side portions are surrounded and connected by the inner surfaces of the lower ends of the D-pillar members, and a closed cross-section structure is formed; A rear panel, which is arranged to cover the rear side and the lower side of the crossbeam and is installed along the left-right direction; and A cover member, which is arranged to connect the rear panel to the rear wheel fender, and the cover member is connected to the lower end of the crossbeam, wherein the cover member is arranged to block the lower end of the side portion of the crossbeam, the cover member includes: A connecting member, which includes a middle portion, a rear end and a front end, the upper surface of the middle portion is connected to the lower end of the side portion of the crossbeam, the rear end is connected to the end portion of the rear panel, and the front end is connected to the rear end of the rear wheel fender; and A reinforcing member, the rear side of the reinforcing member is covered by the rear panel, the upper end portion of the reinforcing member is formed to bend towards the corner space formed between the connecting member and the side portion of the crossbeam to form a bent portion, wherein the bent portion is arranged to block the corner space and is connected to the connecting member and the side portion of the crossbeam.

2. The vehicle body structure for a rear door opening according to claim 1, wherein: The outer pillar member forming the outer surface of the D-pillar member is arranged to: extend downward and cover the outer surface of the connecting member; The rear end of the outer pillar member is connected to the end portion of the rear panel; The front end of the outer pillar member is connected to the rear end of the rear wheel fender.

3. The vehicle body structure for a rear door opening according to claim 2, wherein: The upper end and the lower end of the connecting member are formed to bend outward; A closed cross-section space is formed between the outer surface of the middle portion of the connecting member and the inner surface of the outer pillar member.

4. The vehicle body structure for a rear door opening according to claim 1, which further includes: A rear floor panel, which is arranged to form the bottom surface of the vehicle interior inside the rear door opening and has a first side and a second side, the first side and the second side are arranged to extend backward towards the reinforcing member; Longitudinal beams, which are connected to both sides of the lower part of the rear floor panel along the front-rear direction of the vehicle body structure; And A support member, which is supported on the rear floor panel between the crossbeam and the longitudinal beam and is connected to the connecting member.

5. The vehicle body structure of a rear door opening according to claim 4, wherein, The support member includes: A first support member, which includes: an upper end and a lower end, the upper end is connected and supported on the bottom surface of the side portion of the crossbeam, and the lower end is connected to the upper surface of the rear floor panel; and A second support member, which is connected to the upper surface of the rear floor panel and is formed in a shape covering the front side of the first support member to be connected to the lower end of the side portion of the crossbeam and the inner surface of the connecting member.

6. The vehicle body structure of a rear door opening according to claim 5, wherein: The first support member includes supports on both sides of the first support member, wherein the supports of the first support member have a downwardly curved U-shaped cross-section; The longitudinal beam includes supports on both sides of the longitudinal beam, and the supports of the longitudinal beam have an upwardly curved U-shaped cross-section; The lower ends of the supports of the first support member and the upper ends of the supports of the longitudinal beam are connected to corresponding positions, and the rear floor panel is interposed therebetween.

7. The vehicle body structure of a rear door opening according to claim 6, wherein, The supports of the first support member and the supports of the longitudinal beam are vertically connected.

8. The vehicle body structure of a rear door opening according to claim 5, wherein: An annular cross partition is coupled to the edge of the inner surface of the side portion of the cross beam; The lower end of the annular cross partition is supported on the side portion of the cross beam, and the side portion of the cross beam is connected to the upper end of the first support member.

9. The vehicle body structure of a rear door opening according to claim 5, wherein, The side end portion of the second support member is formed to extend upwardly and laterally to be coupled to the lower end of the side portion of the cross beam and the inner surface of the connection member.

10. The vehicle body structure of a rear door opening according to claim 9, wherein: The second support member is formed in a shape that blocks the front side of the first support member, thereby forming a quadrilateral first closed cross-sectional space in the front-rear direction; The extension portion extending from the side end portion of the second support member is formed in a shape that blocks the space between the first support member, the side portion of the cross beam and the connection member at the front side, thereby forming a quadrilateral second closed cross-sectional space in the front-rear direction; The quadrilateral first closed cross-sectional space and the quadrilateral second closed cross-sectional space are formed in parallel between the side portion of the cross beam and the rear floor panel in the left-right direction.

11. The vehicle body structure of a rear door opening according to claim 1, wherein: An annular column partition is coupled to the edge of the inner surface of the D-pillar member; The lower end of the annular column partition is coupled to the lower end of the side portion of the cross beam, and the lower end of the side portion of the cross beam is coupled to the inside of the D-pillar member.

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