Rear floor structure

Abstract

The utility model discloses a rear floor structure which comprises a rear floor and a rear cross beam, the rear floor comprises a first top plate, a first transition plate and a first bottom plate which are sequentially connected from front to back, the rear cross beam comprises a second top plate, a second transition plate and a second bottom plate which are sequentially connected from front to back, and the first top plate is in lap joint with the second top plate. The first bottom plate is in lap joint with the second bottom plate, and a first cavity is defined by the first top plate, the first transition plate, the second bottom plate and the second transition plate. According to the rear floor structure, the height difference between the rear cross beam and the rear floor basically does not exist, a closed-loop force transmission structure is formed through the first cavity, and due to the fact that the rear cross beam generally corresponds to the position of the auxiliary frame installation plate, the rigidity of an auxiliary frame installation point can be improved through the design of the first cavity; and the overall bending torsional rigidity of the vehicle can also be improved, so that vibration near an auxiliary frame mounting point is restrained, and road noise is effectively avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of automobiles, in particular to a rear floor structure. Background Art

[0002] In the rear floor structure of the vehicle, the rear cross beam usually corresponds to the position of the subframe mounting plate, and the rear cross beam plays a certain role in strengthening the subframe mounting plate. In the conventional technology, there is a certain height difference between the rear floor and the rear cross beam, and there is a certain height difference between the rear cross beam and the subframe mounting plate (which can be understood as a certain difference in the size of the two in the Z-axis direction, and / or a certain difference in the position of the two in the Z-axis direction), thus forming a stepped transition structure, which results in a lower stiffness of the vehicle body subframe mounting point, a lower bending and torsional stiffness of the vehicle, and is prone to cause road noise problems. Utility Model Content

[0003] In view of this, the utility model aims to provide a rear floor structure to solve at least one of the technical problems of the prior art, such as low rigidity of the vehicle body subframe mounting point, low vehicle bending and torsional rigidity, and obvious vehicle road noise.

[0004] The utility model provides a rear floor structure, including a rear floor and a rear cross beam, the rear floor includes a first top plate, a first transition plate and a first bottom plate connected in sequence from front to back, the rear cross beam includes a second top plate, a second transition plate and a second bottom plate connected in sequence from front to back, the first top plate overlaps with the second top plate, the first bottom plate overlaps with the second bottom plate, and the first top plate, the first transition plate, the second bottom plate and the second transition plate are surrounded to form a first cavity.

[0005] Furthermore, it also includes a connecting plate, a longitudinal beam and a sub-frame mounting plate, wherein the connecting plate is connected to both ends of the rear cross beam in the transverse direction, and the connecting plate is connected to the longitudinal beam through the sub-frame mounting plate.

[0006] Further, the connecting plate includes a third front plate, a third bottom plate and a third rear plate connected in sequence from front to back, the third bottom plate is connected to the sub-frame mounting plate and the second bottom plate, the third front plate is connected to the second transition plate, the second top plate, the longitudinal beam and the sub-frame mounting plate, and the third rear plate is connected to the first transition plate, the first top plate, the longitudinal beam and the sub-frame mounting plate.

[0007] Furthermore, the third front plate, the third bottom plate, the third rear plate, the subframe mounting plate, the longitudinal beam and the first top plate are arranged to form a second cavity, and the first cavity is connected to the second cavity to form a closed cavity structure.

[0008] Furthermore, a first flange is connected to the third front plate, and the first flange is overlapped with the first top plate and the longitudinal beam.

[0009] Furthermore, the third front plate is connected with a second flange, and the second flange is overlapped with the longitudinal beam and the sub-frame mounting plate.

[0010] Furthermore, a third flange is connected to the third rear plate, and the third flange overlaps the first top plate.

[0011] Furthermore, a fourth flange is connected to the third rear plate, and the fourth flange is overlapped with the sub-frame mounting plate and the longitudinal beam.

[0012] Furthermore, a fifth flange is connected to the third rear plate, and the fifth flange is overlapped with the first transition plate.

[0013] Furthermore, an extension plate is provided on the third bottom plate, and the extension plate overlaps the sub-frame mounting surface of the sub-frame mounting plate.

[0014] In the rear floor structure of the utility model, the first top plate of the rear floor overlaps the second top plate of the rear cross beam, and the first bottom plate of the rear floor overlaps the second bottom plate of the rear cross beam, so that there is basically no height difference between the rear cross beam and the rear floor, and a first cavity is formed by the first top plate, the first transition plate, the second bottom plate and the second transition plate, forming a closed-loop force transmission structure. Since the rear cross beam usually corresponds to the position of the subframe mounting plate, the design of the first cavity can improve the stiffness of the subframe mounting point, and can also improve the overall bending and torsional stiffness of the vehicle, thereby suppressing vibrations near the subframe mounting point, and effectively avoiding the generation of road noise.

[0015] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, preferred embodiments are given below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In the drawings that are not necessarily drawn to scale, the same reference numerals may describe similar parts in different views. The same reference numerals with letter suffixes or different letter suffixes may represent different instances of similar parts. The drawings generally illustrate various embodiments by way of example and not limitation, and together with the specification and claims, are used to illustrate the disclosed embodiments. When appropriate, the same reference numerals are used throughout the drawings to refer to the same or similar parts. Such embodiments are illustrative and are not intended to be exhaustive or exclusive embodiments of the present apparatus or method. The drawings described herein are used to provide a further understanding of the present invention and constitute a part of this application. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0017] Figure 1 This is one of the three-dimensional schematic diagrams of the rear floor structure of the utility model;

[0018] Figure 2 It is an exploded view of the rear floor structure of the utility model (partial structure is not shown);

[0019] Figure 3 It is a three-dimensional schematic diagram of the connecting plate in the utility model;

[0020] Figure 4 This is the second three-dimensional schematic diagram of the rear floor structure of the utility model (part of the structure is not shown);

[0021] Figure 5 It is an enlarged schematic diagram of the third rear plate of the rear floor structure of the utility model;

[0022] Figure 6 It is a bottom view of the rear floor structure of the utility model;

[0023] Figure 7 yes Figure 6 Schematic diagram of the cross section at AA in the middle;

[0024] Figure 8 yes Figure 6 Schematic diagram of the cross section at BB in the middle.

[0025] The above drawings include the following reference numerals:

[0026] 01. First cavity; 02. Second cavity; 1. Rear floor; 11. First top plate; 12. First transition plate; 13. First bottom plate; 2. Rear cross beam; 21. Second top plate; 22. Second transition plate; 23. Second bottom plate; 3. Connecting plate; 31. Third front plate; 311. First flange; 312. Second flange; 32. Third bottom plate; 321. Extension plate; 33. Third rear plate; 331. Third flange; 332. Fourth flange; 333. Fifth flange; 4. Longitudinal beam; 5. Subframe mounting plate; 100. Middle floor. DETAILED DESCRIPTION

[0027] The specific embodiments of the present invention are described in detail below with reference to the accompanying drawings, but are not intended to limit the present invention.

[0028] It should be noted that the terms "first", "second", etc. in the specification and claims of the utility model and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the utility model described here can be implemented in an order other than those illustrated or described here. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0029] This specification may use the phrases "in one embodiment", "in another embodiment", "in yet another embodiment" or "in other embodiments", all of which may refer to one or more of the same or different embodiments according to the present invention.

[0030] Combination Figures 1 to 8 As shown, the Z-axis in the figure represents the vertical direction of the vehicle, the positive direction of the Z-axis represents the top, and the negative direction of the Z-axis represents the bottom. The X-axis in the figure represents the longitudinal direction of the vehicle, the positive direction of the X-axis represents the front, and the negative direction of the X-axis represents the back. The Y-axis in the figure represents the lateral direction of the vehicle, the positive direction of the Y-axis represents the left, and the negative direction of the Y-axis represents the right.

[0031] The utility model provides a rear floor structure, including a rear floor 1 and a rear cross beam 2, the rear floor 1 includes a first top plate 11, a first transition plate 12 and a first bottom plate 13 connected in sequence from front to back, the rear cross beam 2 includes a second top plate 21, a second transition plate 22 and a second bottom plate 23 connected in sequence from front to back, the first top plate 11 overlaps with the second top plate 21, the first bottom plate 13 overlaps with the second bottom plate 23, the first top plate 11, the first transition plate 12, the second bottom plate 23 and the second transition plate 22 are surrounded to form a first cavity 01.

[0032] Combination Figure 1 and Figure 2 As shown, the rear floor 1 includes a first top plate 11, a first transition plate 12 and a first bottom plate 13 which are connected in sequence from front to back (i.e., from the positive direction of the X-axis to the negative direction of the X-axis). In a complete vehicle body structure, the first top plate 11 of the rear floor 1 overlaps with the edge of the middle floor 100 facing the negative direction of the X-axis. In the vertical direction (i.e., the Z-axis direction), the first top plate 11 is higher than the first bottom plate 13, and the first transition plate 12 is located between the first top plate 11 and the first bottom plate 13. Figure 2 It can be seen that the projections of the first top plate 11 and the first transition plate 12 on the XY plane in the figure are both C-shaped, the edge of the first transition plate 12 along the opposite side of the Z axis is integrally connected to the edge of the first bottom plate 13, and the first top plate 11 surrounds the edge of the first transition plate 12 along the positive side of the Z axis and is integrally connected; the rear cross beam 2 includes a second top plate 21, a second transition plate 22 and a second bottom plate 23 which are integrally connected in sequence from front to back (i.e., from the positive direction of the X axis to the negative direction of the X axis), wherein the second top plate 21 is higher than the second bottom plate 23 in the vertical direction (i.e., the Z axis direction), and the second transition plate 22 is located between the second top plate 21 and the second bottom plate 23, from Figure 2 It can be seen from the figure that the entire rear cross beam 2 is in a Z-shape on the XZ plane in the figure.

[0033] Recombination Figure 6 to Figure 7 As shown, the second top plate 21 overlaps with the first top plate 11, and the second bottom plate 23 overlaps with the first bottom plate 13, thereby eliminating the height difference between the rear cross beam 2 and the rear floor 1 (that is, the dimensions of the two in the Z-axis direction are almost the same, and the positions of the two in the Z-axis direction are almost the same). The first top plate 11, the first transition plate 12, the second bottom plate 23 and the second transition plate 22 are arranged to form a first cavity 01. The first cavity 01 is generally in a quadrilateral shape on the XZ plane in the figure, thereby realizing closed-loop force transmission around the first cavity 01.

[0034] In the rear floor structure of the present invention, the first top plate 11 of the rear floor 1 overlaps with the second top plate 21 of the rear cross beam 2, and the first bottom plate 13 of the rear floor 1 overlaps with the second bottom plate 23 of the rear cross beam 2, so that there is basically no height difference between the rear cross beam 2 and the rear floor 1, and the first cavity 01 is formed by the first top plate 11, the first transition plate 12, the second bottom plate 23 and the second transition plate 22, forming a closed-loop force transmission structure. Since the rear cross beam 2 usually corresponds to the position of the subframe mounting plate, the design of the first cavity 01 can improve the stiffness of the subframe mounting point, and can also improve the overall bending and torsional stiffness of the vehicle, thereby suppressing the vibration near the subframe mounting point, and effectively avoiding the generation of road noise.

[0035] Furthermore, it also includes a connecting plate 3, a longitudinal beam 4 and a sub-frame mounting plate 5, wherein the connecting plate 3 is connected to both ends of the rear cross beam 2 in the lateral direction, and the connecting plate 3 is connected to the longitudinal beam 4 through the sub-frame mounting plate 5.

[0036] Combination Figure 1 and Figure 2 As shown, the two connecting plates 3 are respectively connected to the two ends of the rear cross beam 2 in the lateral direction (i.e., the two ends in the positive and negative directions along the Y axis), and the two longitudinal beams 4 are basically symmetrically arranged on the two sides of the rear floor 1 in the lateral direction (i.e., the two ends in the positive and negative directions along the Y axis), and the subframe mounting plate 5 is connected to the longitudinal beam 4, and the connecting plate 3 is connected to the subframe mounting plate 5.

[0037] In this way, the connecting plate 3 is connected to the longitudinal beam 4 through the sub-frame mounting plate 5, thereby further improving the rigidity of the sub-frame mounting point, which is more conducive to avoiding road noise.

[0038] Furthermore, the connecting plate 3 includes a third front plate 31, a third bottom plate 32 and a third rear plate 33 connected in sequence from front to back, the third bottom plate 32 is connected to the sub-frame mounting plate 5 and the second bottom plate 23, the third front plate 31 is connected to the second transition plate 22, the second top plate 21, the longitudinal beam 4 and the sub-frame mounting plate 5, and the third rear plate 33 is connected to the first transition plate 12, the first top plate 11, the longitudinal beam 4 and the sub-frame mounting plate 5.

[0039] Combination Figures 1 to 3 As shown, the connecting plate 3 includes a third front plate 31, a third bottom plate 32 and a third rear plate 33 which are integrally connected in sequence from front to back (ie, from the positive direction of the X-axis to the negative direction of the X-axis). Figures 3 to 5As shown in the figure, a connecting plate 3 is shown close to the positive side of the Y-axis, wherein the third bottom plate 32 is connected to the sub-frame mounting plate 5 toward the positive side of the Y-axis, the third bottom plate 32 is connected to the second bottom plate 23 toward the negative side of the Y-axis, the third front plate 31 is connected to the second transition plate 22 toward the negative side of the Y-axis, the third front plate 31 is connected to the bottom surface of the second top plate 21 and the flange of the longitudinal beam 4 toward the positive side of the Z-axis, the third front plate 31 is connected to the side wall of the longitudinal beam 4 and the side wall of the sub-frame mounting plate 5 toward the positive side of the Y-axis, the third rear plate 33 is connected to the first transition plate 12 toward the negative side of the Y-axis, the third rear plate 33 is connected to the bottom surface of the C-shaped first top plate 11 toward the positive side of the Z-axis, and the third rear plate 33 is connected to the side wall of the longitudinal beam 4 and the side wall of the sub-frame mounting plate 5 toward the positive side of the Y-axis.

[0040] In this way, the rear cross beam 2 is connected to the rear floor 1, the longitudinal beam 4 and the subframe mounting plate 5 through the connecting plate 3, thereby playing a better reinforcement role for the subframe mounting point and further improving the rigidity of the subframe mounting point.

[0041] Furthermore, the third front plate 31, the third bottom plate 32, the third rear plate 33, the subframe mounting plate 5, the longitudinal beam 4 and the first top plate 11 are arranged to form a second cavity 02, and the first cavity 01 is connected to the second cavity 02 to form a closed cavity structure.

[0042] Combination Figures 3 to 5 as well as Figure 8 As shown in the figure, a connecting plate 3 close to the positive side of the Y-axis is shown, and a third front plate 31, a third bottom plate 32, and a third rear plate 33 respectively form the front side wall, the bottom side wall, and the rear side wall of the second cavity 02, and the side wall of the sub-frame mounting plate 5 and the side wall of the longitudinal beam 4 together form the left side wall of the second cavity 02 (i.e., the side wall close to the positive side of the Y-axis), and the right side of the second cavity 02 is connected with the first cavity 01. Symmetrically, the connecting plate 3 close to the negative side of the Y-axis is also surrounded by the third front plate 31, the third bottom plate 32, the third rear plate 33, the sub-frame mounting plate 5, the longitudinal beam 4 and the first top plate 11 to form another second cavity 02, so that the two ends of the first cavity 01 along the positive and negative directions of the Y-axis are respectively connected with the two second cavities 02, and a closed cavity structure is formed.

[0043] In this way, a closed-loop force transmission structure is formed through the closed cavity structure, and a closed-loop force transmission process can be realized in different directions, further improving the stiffness of the subframe mounting point and the bending and torsional stiffness of the vehicle as a whole.

[0044] Furthermore, a first flange 311 is connected to the third front plate 31 , and the first flange 311 overlaps the first top plate 11 and the longitudinal beam 4 .

[0045] Combination Figures 2 to 4As shown, a first flange 311 is connected to the third front plate 31, and a flange is also connected to one side of the longitudinal beam 4. The first flange 311 is generally parallel to the XY plane in the figure, so that the first flange 311 can fit with the flanges of the first top plate 11 and the longitudinal beam 4, and overlap is achieved by welding and / or riveting.

[0046] In this way, the third front plate 31 is connected to the first top plate 11 and the longitudinal beam 4 by overlapping the first flange 311 with the first top plate 11 and the longitudinal beam 4, thereby improving the stiffness of the subframe mounting point and the bending and torsional stiffness of the vehicle to a certain extent.

[0047] Furthermore, a second flange 312 is connected to the third front plate 31 , and the second flange 312 overlaps the longitudinal beam 4 and the sub-frame mounting plate 5 .

[0048] Combination Figures 2 to 4 As shown, the third front plate 31 is connected with a second flange 312, the sub-frame mounting plate 5 is mounted on the longitudinal beam 4, and in this embodiment, the side wall of the longitudinal beam 4 overlaps with the side wall of the sub-frame mounting plate 5, and the second flange 312 is substantially parallel to the XZ plane in the figure, so that the second flange 312 can fit with the side wall of the sub-frame mounting plate 5 and the side wall of the longitudinal beam 4, and achieve overlap by welding and / or riveting.

[0049] In this way, the third front plate 31 is connected to the sub-frame mounting plate 5 and the longitudinal beam 4 by overlapping the second flange 312, thereby improving the stiffness of the sub-frame mounting point and the bending and torsional stiffness of the vehicle to a certain extent.

[0050] Furthermore, a third flange 331 is connected to the third rear plate 33 , and the third flange 331 overlaps the first top plate 11 .

[0051] Combination Figure 2 , Figure 3 and Figure 5 As shown, the third rear plate 33 is connected to a third flange 331, and the third flange 331 is substantially parallel to the XY plane in the figure. In this embodiment, the first top plate 11 is C-shaped (that is, the first top plate 11 has a partial structure close to the positive side of the Y axis, a partial structure close to the positive side of the X axis, and a partial structure close to the negative side of the Y axis). Figure 5 What is shown is the connecting plate 3 on the positive side of the Y axis, so the third flange 331 in the figure fits with the partial structure of the first top plate 11 close to the positive side of the Y axis, and is overlapped by welding and / or riveting.

[0052] In this way, the third rear plate 33 is connected to the first top plate 11 by overlapping the third flange 331 with the first top plate 11 , thereby improving the rigidity of the sub-frame mounting point and the bending and torsional rigidity of the vehicle to a certain extent.

[0053] Furthermore, a fourth flange 332 is connected to the third rear plate 33 , and the fourth flange 332 overlaps the sub-frame mounting plate 5 and the longitudinal beam 4 .

[0054] Combination Figure 2 , Figure 3 and Figure 5 As shown, a fourth flange 332 is connected to the third rear plate 33, and the fourth flange 332 is substantially parallel to the XZ plane in the figure. In this embodiment, the side wall of the sub-frame mounting plate 5 and the side wall of the longitudinal beam 4 are overlapped, and the fourth flange 332 is in contact with the side wall of the sub-frame mounting plate 5 and the side wall of the longitudinal beam 4, and the overlap is achieved by welding and / or riveting.

[0055] In this way, the third rear plate 33 is connected to the sub-frame mounting plate 5 and the longitudinal beam 4 by overlapping the fourth flange 332 with the sub-frame mounting plate 5 and the longitudinal beam 4, thereby improving the stiffness of the sub-frame mounting point and the bending and torsional stiffness of the vehicle to a certain extent.

[0056] Furthermore, a fifth flange 333 is connected to the third rear plate 33 , and the fifth flange 333 overlaps the first transition plate 12 .

[0057] Combination Figure 2 , Figure 3 and Figure 5 As shown, the third rear plate 33 is connected to a fifth flange 333. In this embodiment, the first transition plate 12 is C-shaped (that is, the first transition plate 12 has a partial structure close to the positive side of the Y axis, a partial structure close to the positive side of the X axis, and a partial structure close to the negative side of the Y axis), and Figure 5 What is shown is the connecting plate 3 close to the positive side of the Y-axis. Therefore, the orientation of the fifth flange 333 can be determined based on the plate surface orientation of the partial structure of the first transition plate 12 close to the positive side of the Y-axis, so that the fifth flange 333 fits with the partial structure of the first transition plate 12 and is overlapped by welding and / or riveting.

[0058] In this way, the third rear plate 33 is connected to the first transition plate 12 by overlapping the fifth flange 333 with the first transition plate 12 , thereby improving the rigidity of the sub-frame mounting point and the bending and torsional rigidity of the vehicle to a certain extent.

[0059] Furthermore, an extension plate 321 is provided on the third bottom plate 32 , and the extension plate 321 overlaps the sub-frame mounting surface of the sub-frame mounting plate 5 .

[0060] Combination Figures 2 to 5 as well as Figure 8 As shown, Figures 3 to 5 as well as Figure 8The connecting plate 3 is shown as being close to the positive side of the Y axis. The third bottom plate 32 is provided with an extension plate 321 extending toward the positive side of the Y axis (i.e., the outer side). The extension plate 321 is overlapped on the sub-frame mounting surface ( Figure 2 A mounting hole is provided on the surface of the middle sub-frame mounting plate 5 facing the opposite side of the Z axis, which surface is the sub-frame mounting surface.

[0061] In this way, by overlapping the extension plate 321 with the sub-frame mounting surface of the sub-frame mounting plate 5, a height difference between the sub-frame mounting plate 5 and the connecting plate 3 is avoided, which is conducive to forming a closed-loop force transmission, and improves the stiffness of the sub-frame mounting point and the bending and torsional stiffness of the vehicle as a whole.

[0062] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used herein to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" may include both "above" and "below". The device may also be positioned in other different ways, rotated 90 degrees or in other orientations, and the spatially relative descriptions used herein are interpreted accordingly.

[0063] In addition to the above, it should be noted that "one embodiment", "another embodiment", "embodiment", etc. mentioned in this specification refer to the specific features, structures or characteristics described in conjunction with the embodiment included in at least one embodiment generally described in this application. The same expression appearing in multiple places in the specification does not necessarily refer to the same embodiment. Further, when describing a specific feature, structure or characteristic in conjunction with any embodiment, it is claimed that the realization of such feature, structure or characteristic in conjunction with other embodiments also falls within the scope of the present utility model.

[0064] The above description is only the preferred embodiment of the utility model, and is not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A rear floor structure, characterized in that: The invention comprises a rear floor (1) and a rear cross beam (2), wherein the rear floor (1) comprises a first top plate (11), a first transition plate (12) and a first bottom plate (13) which are connected in sequence from front to back, and the rear cross beam (2) comprises a second top plate (21), a second transition plate (22) and a second bottom plate (23) which are connected in sequence from front to back, the first top plate (11) overlaps with the second top plate (21), the first bottom plate (13) overlaps with the second bottom plate (23), and the first top plate (11), the first transition plate (12), the second bottom plate (23) and the second transition plate (22) are arranged to form a first cavity (01).

2. The rear floor structure according to claim 1, characterized in that: It also comprises a connecting plate (3), a longitudinal beam (4) and a sub-frame mounting plate (5), wherein the connecting plate (3) is connected to both ends of the rear cross beam (2) in the transverse direction, and the connecting plate (3) is connected to the longitudinal beam (4) via the sub-frame mounting plate (5).

3. The rear floor structure according to claim 2, characterized in that: The connecting plate (3) comprises a third front plate (31), a third bottom plate (32) and a third rear plate (33) which are connected in sequence from front to back; the third bottom plate (32) is connected to the sub-frame mounting plate (5) and the second bottom plate (23); the third front plate (31) is connected to the second transition plate (22), the second top plate (21), the longitudinal beam (4) and the sub-frame mounting plate (5); and the third rear plate (33) is connected to the first transition plate (12), the first top plate (11), the longitudinal beam (4) and the sub-frame mounting plate (5).

4. The rear floor structure according to claim 3, characterized in that: The third front plate (31), the third bottom plate (32), the third rear plate (33), the subframe mounting plate (5), the longitudinal beam (4) and the first top plate (11) are arranged to form a second cavity (02); the first cavity (01) is connected to the second cavity (02) to form a closed cavity structure.

5. The rear floor structure according to claim 3, characterized in that: The third front plate (31) is connected to a first flange (311), and the first flange (311) overlaps the first top plate (11) and the longitudinal beam (4).

6. The rear floor structure according to claim 3, characterized in that: The third front plate (31) is connected to a second flange (312), and the second flange (312) overlaps the longitudinal beam (4) and the auxiliary frame mounting plate (5).

7. The rear floor structure according to claim 3, characterized in that: The third rear plate (33) is connected to a third flange (331), and the third flange (331) overlaps the first top plate (11).

8. The rear floor structure according to claim 3, characterized in that: The third rear plate (33) is connected to a fourth flange (332), and the fourth flange (332) is overlapped with the sub-frame mounting plate (5) and the longitudinal beam (4).

9. The rear floor structure according to claim 3, characterized in that: The third rear plate (33) is connected to a fifth flange (333), and the fifth flange (333) overlaps the first transition plate (12).

10. The rear floor structure according to claim 3, characterized in that: An extension plate (321) is provided on the third bottom plate (32), and the extension plate (321) overlaps the sub-frame mounting surface of the sub-frame mounting plate (5).

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