Rear floor frame structure and vehicle

Abstract

Embodiments of the present application provide a rear floor frame structure and a vehicle. The rear floor frame structure comprises a rear floor frame and a second-row seat mounting support. The rear floor frame comprises a first longitudinal beam, a second longitudinal beam, a first cross beam assembly and a second cross beam assembly. The first cross beam assembly and the second cross beam assembly are connected between the first longitudinal beam and the second longitudinal beam. The first cross beam assembly and the second cross beam assembly are arranged in a spaced manner along the front-rear direction of the vehicle. The first cross beam assembly is provided with a second-row seat mounting structure, the second cross beam assembly is provided with a third-row seat mounting structure, and the second-row seat mounting support is detachably connected between the first cross beam assembly and the second cross beam assembly. Through detachable connection of the seat mounting structure, the layout of the rear floor frame structure can be changed, so that the same rear floor frame structure can adapt to the design requirements of different vehicle models, and the development cost and manufacturing cost are reduced.

Description

Technical Field

[0001] This application relates to the field of vehicle technology, and more particularly to a rear floor frame structure and vehicle. Background Technology

[0002] In vehicles, five-seater, six-seater, or seven-seater models have different installation requirements. The current rear floor frame cannot achieve expansion compatibility with different seat configurations, and molds for the rear floor frame need to be configured separately for different seats, resulting in a significant increase in development and manufacturing costs. Utility Model Content

[0003] This application provides a rear floor frame structure and vehicle, which aims to improve the current rear floor frame's inability to achieve expanded compatibility with different seat configurations.

[0004] This application provides a rear floor frame structure, including a rear floor frame and a second-row seat mounting bracket. The rear floor frame includes a first longitudinal beam, a second longitudinal beam, a first crossbeam assembly, and a second crossbeam assembly. The first crossbeam assembly and the second crossbeam assembly are connected between the first longitudinal beam and the second longitudinal beam. The first crossbeam assembly and the second crossbeam assembly are spaced apart along the front-rear direction of the vehicle. The first crossbeam assembly is provided with a second row seat mounting structure, the second crossbeam assembly is provided with a third row seat mounting structure, and the second row seat mounting bracket is detachably connected between the first crossbeam assembly and the second crossbeam assembly.

[0005] In this embodiment, when configuring the first vehicle model, the second-row seat mounting bracket is installed between the first and second crossbeam assemblies, and the second-row seats are mounted on the second-row seat mounting bracket. When configuring the second vehicle model, the second-row seat mounting bracket is removed. The first and second crossbeam assemblies then serve as the mounting base, and the second-row seats are mounted on the first crossbeam assembly, while the third-row seats are mounted on the second crossbeam assembly. By detachably connecting the second-row seat mounting bracket between the first and second crossbeam assemblies, the layout of the rear floor frame structure can be altered, allowing the same rear floor frame structure to adapt to the design requirements of different vehicle models, improving the versatility of parts and production efficiency. It also reduces the number of dedicated parts developed and produced for different vehicle models, lowering development and manufacturing costs.

[0006] Optionally, the second crossbeam assembly is higher than the first crossbeam assembly in the vertical direction of the vehicle. By connecting the second-row seat mounting bracket between the first and second crossbeam assemblies, an installation position that meets the seat installation requirements can be created, facilitating the installation of the second-row seats.

[0007] Optionally, the first crossbeam assembly includes a first crossbeam and a second crossbeam, which are spaced apart along the vehicle's longitudinal direction, with the first crossbeam positioned in front of the second crossbeam. The first crossbeam provides a mounting position for the front end of the second-row seats, and the second crossbeam provides a mounting position for the rear end of the second-row seats, enabling the second-row seats to be mounted on the first crossbeam assembly.

[0008] Optionally, the second-row seat mounting structure includes a plurality of first connecting holes and a plurality of second connecting holes. The plurality of first connecting holes are spaced apart on the first crossbeam, and the plurality of second connecting holes are spaced apart on the second crossbeam. The first connecting holes are used for first fasteners to pass through, so as to mount the front end of the second-row seat to the first crossbeam. The second connecting holes are used for second fasteners to pass through, so as to mount the rear end of the second-row seat to the second crossbeam. By using fasteners in the first and second connecting holes, it is easy to assemble and disassemble the second-row seat on the first crossbeam assembly.

[0009] Optionally, the second crossbeam assembly includes a third crossbeam and a fourth crossbeam, the third crossbeam and the fourth crossbeam being spaced apart along the vehicle's longitudinal direction, the third crossbeam being located in front of the fourth crossbeam; The second-row seat mounting bracket is detachably connected between the second crossbeam and the third crossbeam. The third crossbeam provides a mounting position for the front end of the third-row seat, and the fourth crossbeam provides a mounting position for the rear end of the third-row seat, thus enabling the third-row seat to be mounted on the second crossbeam assembly.

[0010] Optionally, the third-row seat mounting structure includes multiple third connecting holes and multiple fourth connecting holes. The multiple third connecting holes are spaced apart on the third crossbeam, and the multiple fourth connecting holes are spaced apart on the fourth crossbeam. The third connecting holes are for inserting third fasteners to mount the front end of the third-row seat to the third crossbeam, and the fourth connecting holes are for inserting fourth fasteners to mount the rear end of the third-row seat to the fourth crossbeam. By inserting fasteners into the third and fourth connecting holes, the installation and removal of the third-row seat is facilitated.

[0011] Optionally, the second-row seat mounting bracket, the first longitudinal beam, the second longitudinal beam, the first crossbeam, the second crossbeam, the third crossbeam, and the fourth crossbeam are all integrally die-cast structures. This design features a high degree of integration, fewer weld overlaps, and a simpler assembly process for the rear floor frame structure. Furthermore, the integral die-cast structure resolves the issue of discontinuous stiffness in the overlap areas, significantly improving seat comfort.

[0012] Optionally, the first longitudinal beam is provided with a first connecting structure and a second connecting structure, and the second longitudinal beam is provided with a third connecting structure and a fourth connecting structure; The first connecting structure is used to connect the left side of the first crossbeam assembly to the first longitudinal beam, and the second connecting structure is used to connect the left side of the second crossbeam assembly to the first longitudinal beam. The third connecting structure connects the right side of the first crossbeam assembly to the second longitudinal beam, and the fourth connecting structure connects the right side of the second crossbeam assembly to the second longitudinal beam. The first and third connecting structures connect the first crossbeam assembly to the first and second longitudinal beams, and the second and fourth connecting structures connect the second crossbeam assembly to the first and second longitudinal beams, ultimately forming a rectangular closed-loop frame, making the entire rear floor frame more robust.

[0013] Optionally, the second-row seat mounting bracket includes a mounting frame, a first mounting part, and a second mounting part. The first mounting part is located at the front end of the mounting frame and is connected to the first crossbeam assembly. The second mounting part is located at the rear end of the mounting frame and is connected to the second crossbeam assembly. Through the connection between the first mounting part and the first crossbeam assembly, and the connection between the second mounting part and the second crossbeam assembly, the seat can be firmly fixed to the rear floor frame, ensuring the stable fixation of the second-row seat mounting bracket.

[0014] Optionally, the first mounting part is connected to the lower part of the mounting frame, and the front end of the mounting frame is located above the first crossbeam assembly. The structural height of the first mounting part itself can support the front end of the mounting frame, facilitating the installation of the second-row seats.

[0015] Optionally, the first mounting part includes a plurality of support columns, which are connected between the front end of the mounting frame and the rear end of the first crossbeam assembly. The multiple support columns are spaced apart along the left-right direction of the vehicle. These multiple support columns enable the mounting frame to be installed on the first crossbeam assembly, distributing the load at the front end of the mounting frame to the first crossbeam assembly.

[0016] Optionally, the second mounting part includes multiple connecting plates, the front end of which is connected to the mounting frame, and the rear end of which is connected to the front end of the second crossbeam assembly. The multiple connecting plates with plate-like structures provide a large contact surface with the second crossbeam assembly, distributing the load at the rear end of the mounting frame to the second crossbeam assembly and ensuring the connection strength at the rear end of the mounting frame.

[0017] Optionally, the rear end of the connecting plate is provided with a first mounting hole for inserting a fastener into the connecting plate, so that the rear end of the connecting plate can be connected to the front end of the second crossbeam assembly, facilitating the assembly and disassembly of the connecting plate.

[0018] Optionally, the second row seat mounting bracket is provided with a plurality of second mounting holes and a plurality of third mounting holes. The second mounting holes are provided in the mounting frame, and the plurality of second mounting holes are used for seat fasteners to pass through, so that the second row seat can be mounted on the mounting frame. The third mounting hole is provided in the first mounting part, and the plurality of the third mounting holes are used for the frame fasteners to pass through, so that the mounting frame can be installed on the first crossbeam assembly, so as to realize the assembly of the first crossbeam assembly, the second row seat mounting bracket and the second row seat.

[0019] Optionally, the mounting frame includes a front crossbeam, a rear crossbeam, and multiple third longitudinal beams. The multiple third longitudinal beams are connected between the front crossbeam and the rear crossbeam, and weight-reducing holes are formed between adjacent third longitudinal beams. The first mounting part is connected to the front crossbeam, the second mounting part is connected to the rear crossbeam, and the second mounting hole is provided in the front crossbeam and the rear crossbeam, which can fix the seat in both the front and rear positions, improving the installation stability of the second row of seats.

[0020] Optionally, the rear floor frame structure further includes a rear floor connected to the rear floor frame, and the second-row seat mounting bracket is located above the rear floor.

[0021] Optionally, the rear floor is a one-piece die-cast structure with a high degree of integration and fewer weld overlaps, which helps to improve the overall strength.

[0022] This application also provides a vehicle including a rear floor frame structure as described in any of the preceding claims.

[0023] In this embodiment, the seats inside the vehicle have different configurations. By installing and removing the second-row seat mounting brackets, it is convenient to accommodate the seat layout of different models, so that the same rear floor frame structure can adapt to the design requirements of different models, thereby improving the versatility of parts and production efficiency. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of a rear floor frame structure provided in one embodiment of this application; Figure 2 This is a schematic diagram of a second-row seat mounting bracket provided in one embodiment of this application. Figure 1 ; Figure 3 This is a schematic diagram of a second-row seat mounting bracket provided in one embodiment of this application. Figure 2 ; Figure 4 This is a schematic diagram of a second-row seat mounting bracket provided in one embodiment of this application. Figure 3 ; Figure 5 This is a schematic diagram of a rear floor frame provided in one embodiment of this application; Figure 6 This is a schematic diagram of a third reinforcing rib and a fourth reinforcing rib provided in an embodiment of this application; Figure 7 This is a schematic diagram of a first longitudinal beam and a second longitudinal beam provided in one embodiment of this application; Figure 8 This is a seating arrangement diagram of a five-seat vehicle provided in one embodiment of this application; Figure 9 This is a seating arrangement diagram of a six-seat vehicle provided in one embodiment of this application.

[0025] Explanation of reference numerals in the attached figures: 100. Rear floor frame structure; 10. Rear floor frame; 11. First longitudinal beam; 111. Fifth connecting hole; 1111. First hole; 1112. Second hole; 112. Sixth connecting hole; 1121. Third hole; 1122. Fourth hole; 113. Third reinforcing rib; 114. Fourth reinforcing rib; 12. Second longitudinal beam; 121. Seventh connecting hole; 1211. Fifth hole; 1212. Sixth hole; 122. Eighth connecting hole; 1221. Seventh hole; 1222. Eighth hole; 13. First crossbeam assembly; 131. First crossbeam; 1311. First connecting hole; 132. Second crossbeam; 1321. Second connecting hole; 14. Second crossbeam assembly; 141. Third crossbeam; 1411. Third connecting hole; 142. Fourth crossbeam; 1421. Fourth connecting hole; 20. Second-row seat mounting bracket; 21. Mounting frame; 211. Front crossbeam; 212. Rear crossbeam; 213. Third longitudinal beam; 214. Weight reduction hole; 215. First reinforcing rib; 216. Second reinforcing rib; 217. Through hole; 22. First mounting part; 221. Support column; 23. Second mounting part; 231. Connecting plate; 2311. First plate; 2312. Second plate; 232. First mounting hole; 24. Second mounting hole; 25. Third mounting hole; 30. Floor; 200, second row seats; 300, third row seats. Detailed Implementation

[0026] To make the technical problems, technical solutions, and beneficial effects solved by this application clearer, the following detailed description is provided in conjunction with embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0027] With the rapid development of automotive technology, people's demands for vehicle functions and performance are increasing. The rationality of the design of the rear floor frame and seat installation structure directly determines the quality of seat comfort and the durability and reliability of the vehicle body. Currently, the rear floor frame structure is designed to be matched separately for five, six, or seven seats, and different seat configurations cannot be expanded and compatible with each other. This design limitation prevents the implementation of a modular development model that allows for "one basic frame to be compatible with two seat configurations" in vehicle development. Different seat layouts require separate rear floor frame designs, which cannot reduce development costs.

[0028] Furthermore, current seat mounting frames are typically formed by connecting multiple parts through processes such as welding and riveting. The welded and riveted joints are prone to creating stiffness breaks, resulting in discontinuities in the overall frame stiffness. When encountering bumps during vehicle operation, these weaker areas are susceptible to irregular deformation, which is directly transmitted to the seat surface, compromising ride comfort and stability. On the other hand, the numerous connection points make these connections prone to failure, leading to abnormal noises in the seat system and even complete failure of the connection itself. This severely weakens the durability and reliability of the seat mounting frame, negatively impacting driving safety and the user experience.

[0029] like Figures 1 to 7 As shown, this application embodiment provides a rear floor frame structure 100, including a rear floor frame 10 and a second-row seat mounting bracket 20. The rear floor frame 10 includes a first longitudinal beam 11, a second longitudinal beam 12, a first crossbeam assembly 13, and a second crossbeam assembly 14. The first crossbeam assembly 13 and the second crossbeam assembly 14 are connected between the first longitudinal beam 11 and the second longitudinal beam 12, and are spaced apart along the front-rear direction of the vehicle. The first crossbeam assembly 13 is provided with a second-row seat mounting structure, and the second crossbeam assembly 14 is provided with a third-row seat mounting structure. The second-row seat mounting bracket 20 is detachably connected between the first crossbeam assembly 13 and the second crossbeam assembly 14.

[0030] The first crossbeam assembly 13 and the second crossbeam assembly 14 are connected at intervals between the first longitudinal beam 11 and the second longitudinal beam 12. The first longitudinal beam 11, the second longitudinal beam 12, the first crossbeam assembly 13 and the second crossbeam assembly 14 can form a main frame structure, which has a supporting function and provides an installation base for the rear seats of the vehicle body.

[0031] By setting up a second-row seat mounting structure, the second-row seat 200 can be mounted on the first crossbeam assembly 13. By setting up a third-row seat mounting structure, the third-row seat 300 can be mounted on the second crossbeam assembly 14. The second-row seat 200 can be mounted on the second-row seat mounting bracket 20. The second-row seat 200 can be selectively mounted on either the first crossbeam assembly 13 or the second-row seat mounting bracket 20. That is, the vehicle has two seat layout options: the second-row seat 200 is mounted on the second-row seat mounting bracket 20, or the second-row seat 200 is mounted on the first crossbeam assembly 13 and the third-row seat 300 is mounted on the second crossbeam assembly 14.

[0032] In this embodiment, the second-row seat mounting bracket 20 is detachably connected between the first crossbeam assembly 13 and the second crossbeam assembly 14. By using the detachable second-row seat mounting bracket 20 as a "function switching module", the layout of the rear floor frame structure 100 can be changed, thereby achieving compatibility between two different vehicle models.

[0033] When configuring the first vehicle model, the second-row seat mounting bracket 20 is installed between the first crossbeam assembly 13 and the second crossbeam assembly 14, and the second-row seat 200 is mounted on the second-row seat mounting bracket 20. When configuring the second vehicle model, the second-row seat mounting bracket 20 is removed. In this case, the first crossbeam assembly 13 and the second crossbeam assembly 14 serve as the mounting base. The second-row seat 200 is mounted on the first crossbeam assembly 13, and the third-row seat 300 is mounted on the second crossbeam assembly 14. In this embodiment, the installation and removal of the second-row seat mounting bracket 20 facilitates seat layouts for different vehicle models, allowing the same rear floor frame structure 100 to adapt to the design requirements of different vehicle models, improving the versatility of parts and production efficiency. It also reduces the number of dedicated parts developed and produced separately for different vehicle models, lowering development and manufacturing costs.

[0034] As an example, the rear floor frame structure 100 includes a rear floor frame 10 and a second-row seat mounting bracket 20. The rear floor frame 10 includes a first longitudinal beam 11, a second longitudinal beam 12, a first crossbeam assembly 13, and a second crossbeam assembly 14. The first crossbeam assembly 13 and the second crossbeam assembly 14 are connected between the first longitudinal beam 11 and the second longitudinal beam 12, with the first crossbeam assembly 13 located in front of the second crossbeam assembly 14. The first crossbeam assembly 13 and the second crossbeam assembly 14 can be connected to the first longitudinal beam 11 and the second longitudinal beam 12 by welding, snap-fitting, or screwing. The second-row seat mounting bracket 20 is detachably connected between the first crossbeam assembly 13 and the second crossbeam assembly 14. This detachable connection typically uses common mechanical connection methods such as bolt connection or snap-fit ​​connection, allowing the second-row seat mounting bracket 20 to be easily installed and removed.

[0035] In this example, the second-row seat mounting bracket 20 can accommodate both five-seater and six-seater models. When configuring a five-seater model, as follows: Figure 8 As shown, only one row of seats needs to be installed at the rear of the vehicle, that is, the second-row seats 200 are mounted on the second-row seat mounting brackets 20. When configuring a six-seat model, as... Figure 9 As shown, two rows of seats are installed at the rear of the vehicle. With the second-row seat mounting bracket 20 removed, the arrangement of the two rows of seats can be accommodated via the first crossbeam assembly 13 and the second crossbeam assembly 14. The same rear floor frame structure 100 can be extended to two different vehicle models via the second-row seat mounting bracket 20, solving the problem of seat system assembly space and achieving compatibility between six-seater and five-seater models.

[0036] In one embodiment, the second-row seat mounting bracket 20 is integrally die-cast, which reduces the number of parts and connection points compared to the traditional second-row seat mounting bracket 20. This reduces the problems of easy cracking and connection failure of the lap weld points and improves the durability and reliability of the rear floor frame structure 100.

[0037] Furthermore, the one-piece die-cast second-row seat mounting bracket 20 is easier and more convenient to install and remove, while also achieving weight reduction and lightening of the second-row seat mounting bracket 20.

[0038] In one embodiment, the first longitudinal beam 11 and the second longitudinal beam 12 are integrally die-cast, which can effectively transfer the chassis load and effectively transfer the impact load of the rear shock absorber and the rear suspension spring tower to the upper body. This solves the problem of excessively concentrated impact load and easy cracking of the lap weld, improves the durability and reliability of the rear floor frame 10, thereby reducing the deformation of the rear of the vehicle body, protecting the battery pack from compression, and improving the collision performance of the vehicle body.

[0039] As an example, the first longitudinal beam 11 and the second longitudinal beam 12 are integrally die-cast, and the second-row seat mounting bracket 20 is also integrally die-cast. The rear floor frame structure 100 is formed by the first longitudinal beam 11, the second longitudinal beam 12, the first crossbeam assembly 13, the second crossbeam assembly 14, and the second-row seat mounting bracket 20. This structure has a high degree of integration, fewer weld overlaps, and greater continuity, significantly improving the vehicle's torsional stiffness, modal performance, rear-end collision performance, NVH performance, ride comfort, and overall vehicle durability and reliability. The assembly process of the rear floor frame structure 100 is simple. Furthermore, the integral die-cast structure solves the problem of discontinuous stiffness in the overlapping areas, resulting in a significant improvement in seat comfort.

[0040] In one embodiment, such as Figure 1 , Figure 5As shown, along the vertical direction of the vehicle, the second crossbeam assembly 14 is higher than the first crossbeam assembly 13. The height difference between the first crossbeam assembly 13 and the second crossbeam assembly 14 along the vertical direction of the vehicle is unfavorable for the seat configuration of a five-seat vehicle. In this embodiment, by connecting the second-row seat mounting bracket 20 between the first crossbeam assembly 13 and the second crossbeam assembly 14, an installation position that meets the seat installation requirements can be created, effectively improving the adverse effects of the height difference of the crossbeam assemblies on the installation of the second-row seats.

[0041] In one embodiment, such as Figure 5 As shown, the first crossbeam assembly 13 includes a first crossbeam 131 and a second crossbeam 132. The first crossbeam 131 and the second crossbeam 132 are spaced apart along the front-rear direction of the vehicle, and the first crossbeam 131 is located in front of the second crossbeam 132.

[0042] When the second-row seat 200 is installed on the first crossbeam assembly 13, the first crossbeam 131 provides an installation position for the front end of the second-row seat 200, and the second crossbeam 132 provides an installation position for the rear end of the second-row seat 200, thus enabling the installation of the second-row seat 200 on the first crossbeam assembly 13.

[0043] The first crossbeam 131 and the second crossbeam 132 are connected between the first longitudinal beam 11 and the second longitudinal beam 12, and both the first crossbeam 131 and the second crossbeam 132 extend along the left and right directions of the vehicle.

[0044] In one embodiment, such as Figure 5 As shown, the second-row seat mounting structure includes multiple first connecting holes 1311 and multiple second connecting holes 1321. The multiple first connecting holes 1311 are spaced apart on the first crossbeam 131, and the multiple second connecting holes 1321 are spaced apart on the second crossbeam 132. The first connecting holes 1311 are used for first fasteners to pass through, so as to install the front end of the second-row seat 200 onto the first crossbeam 131 of the first crossbeam assembly. The second connecting holes 1321 are used for second fasteners to pass through, so as to install the rear end of the second-row seat 200 onto the second crossbeam 132 of the first crossbeam assembly. By using fasteners to pass through the first connecting holes 1311 and the second connecting holes 1321, it is convenient to assemble and disassemble the second-row seat 200 on the first crossbeam assembly 13.

[0045] As an example, the first crossbeam 131 is provided with a plurality of first connecting holes 1311, which are spaced apart along the first crossbeam 131. A first fastener passes through the first connecting hole 1311 and connects to the front end of the second row seat 200, thereby connecting the front end of the second row seat 200 to the first crossbeam 131. The second crossbeam 132 is provided with a plurality of second connecting holes 1321, which are spaced apart along the second crossbeam 132. A second fastener passes through the second connecting hole 1321 and connects to the rear end of the second row seat 200, thereby connecting the rear end of the second row seat 200 to the second crossbeam 132.

[0046] The first fastener is a bolt or screw, and the second fastener is a bolt or screw.

[0047] The number of first connecting holes 1311 and the number of second connecting holes 1321 can be set according to the actual installation requirements of the second-row seats 200. For example Figure 5 The diagram illustrates the positions of the first connecting hole 1311 and the second connecting hole 1321. The first crossbeam 131 is provided with four first connecting holes 1311, and the second crossbeam 132 is provided with four second connecting holes 1321.

[0048] In one embodiment, such as Figure 5 As shown, the second crossbeam assembly 14 includes a third crossbeam 141 and a fourth crossbeam 142, which are spaced apart along the front-rear direction of the vehicle. The third crossbeam 141 is located in front of the fourth crossbeam 142. The second-row seat mounting bracket 20 is detachably connected between the second crossbeam 142 and the third crossbeam 141.

[0049] As an example, the second crossbeam assembly 14 includes a third crossbeam 141 and a fourth crossbeam 142, which are spaced apart along the vehicle's longitudinal direction, with the third crossbeam 141 positioned in front of the fourth crossbeam 142. When the third-row seat 300 is installed on the second crossbeam assembly 14, the third crossbeam 141 provides an installation position for the front end of the third-row seat 300, and the fourth crossbeam 142 provides an installation position for the rear end of the third-row seat 300, thus enabling the installation of the third-row seat 300 on the second crossbeam assembly 14. The third crossbeam 141 and the fourth crossbeam 142 connect the first longitudinal beam 11 and the second longitudinal beam 12, and both extend along the vehicle's lateral direction.

[0050] The second-row seat mounting bracket 20 is detachably connected between the second crossbeam 132 and the third crossbeam 141.

[0051] In this example, the second-row seat mounting bracket 20 is set between the second crossbeam 132 and the third crossbeam 141, which can create an installation position between the second crossbeam 132 and the third crossbeam 141. The installation and removal of the second-row seat mounting bracket 20 provides convenience for the seat layout of different models, so that the same rear floor frame structure 100 can adapt to the design requirements of different models.

[0052] In one embodiment, such as Figure 5 As shown, the third-row seat mounting structure includes multiple third connecting holes 1411 and multiple fourth connecting holes 1421. The multiple third connecting holes 1411 are spaced apart on the third crossbeam 141, and the multiple fourth connecting holes 1421 are spaced apart on the fourth crossbeam 142. The third connecting holes 1411 are used for third fasteners to pass through, so as to install the front end of the third-row seat 300 onto the third crossbeam 141 of the second crossbeam assembly 14. The fourth connecting holes 1421 are used for fourth fasteners to pass through, so as to install the rear end of the third-row seat 300 onto the fourth crossbeam 142 of the second crossbeam assembly 14. By using fasteners through the third connecting holes 1411 and the fourth connecting holes 1421, the installation and removal of the third-row seat 300 are facilitated.

[0053] As an example, the third crossbeam 141 is provided with a plurality of third connecting holes 1411, which are spaced apart along the third crossbeam 141. A third fastener passes through the third connecting holes 1411 and connects to the front end of the third-row seat 300, thus connecting the front end of the third-row seat 300 to the third crossbeam 141. The fourth crossbeam 142 is provided with a plurality of fourth connecting holes 1421, which are spaced apart along the fourth crossbeam 142. A fourth fastener passes through the fourth connecting holes 1421 and connects to the rear end of the third-row seat 300, thus connecting the rear end of the third-row seat 300 to the fourth crossbeam 142.

[0054] The third fastener is a bolt or screw, and the fourth fastener is a bolt or screw.

[0055] The number of third connecting holes 1411 and the number of fourth connecting holes 1421 can be set according to the actual installation requirements of the third-row seats 300. For example Figure 5 The diagram illustrates the positions of the third connecting hole 1411 and the fourth connecting hole 1421. The third crossbeam 141 is provided with four third connecting holes 1411, and the fourth crossbeam 142 is provided with four fourth connecting holes 1421.

[0056] In one embodiment, such as Figure 7As shown, the first longitudinal beam 11 is provided with a first connecting structure and a second connecting structure, and the second longitudinal beam 12 is provided with a third connecting structure and a fourth connecting structure; the first connecting structure is used to connect the left side of the first crossbeam assembly 13 to the first longitudinal beam 11, and the second connecting structure is used to connect the left side of the second crossbeam assembly 14 to the first longitudinal beam 11. The third connecting structure is used to connect the right side of the first crossbeam assembly 13 to the second longitudinal beam 12, and the fourth connecting structure is used to connect the right side of the second crossbeam assembly 14 to the second longitudinal beam 12.

[0057] The first longitudinal beam 11 and the second longitudinal beam 12 serve as the main longitudinal load-bearing structures of the vehicle body. The first crossbeam assembly 13 is connected between the first longitudinal beam 11 and the second longitudinal beam 12 through the first connecting structure and the third connecting structure. The second crossbeam assembly 14 is connected between the first longitudinal beam 11 and the second longitudinal beam 12 through the second connecting structure and the fourth connecting structure, ultimately forming a rectangular closed-loop frame. This makes the entire rear floor frame 10 more robust, reduces deformation and swaying at the rear of the vehicle body, and improves the vehicle's handling stability and driving safety.

[0058] The first longitudinal beam 11 and the second longitudinal beam 12 are symmetrically arranged, the first connecting structure and the third connecting structure are arranged opposite each other in the left-right direction of the vehicle, and the second connecting structure and the fourth connecting structure are arranged opposite each other in the left-right direction of the vehicle.

[0059] In one embodiment, the first connecting structure includes a fifth connecting hole 111, and the second connecting structure includes a sixth connecting hole 112. The fifth connecting hole 111 is for a fifth fastener to pass through, through which the left side of the first crossbeam assembly 13 can be connected to the first longitudinal beam 11. The sixth connecting hole 112 is for a sixth fastener to pass through, through which the left side of the second crossbeam assembly 14 can be connected to the first longitudinal beam 11.

[0060] The third connection structure includes a seventh connection hole 121, and the fourth connection structure includes an eighth connection hole 122. The seventh connection hole 121 is used for a seventh fastener to pass through, through which the right side of the first crossbeam assembly 13 can be connected to the second longitudinal beam 12. The eighth connection hole 122 is used for an eighth fastener to pass through, through which the right side of the second crossbeam assembly 14 can be connected to the second longitudinal beam 12.

[0061] In one embodiment, such as Figure 7As shown, the first longitudinal beam 11 is provided with a fifth connecting hole 111 and a sixth connecting hole 112. The fifth connecting hole 111 includes a first hole 1111 and a second hole 1112, and a fifth fastener can be inserted into both the first hole 1111 and the second hole 1112. The first crossbeam assembly 13 includes a first crossbeam 131 and a second crossbeam 132. The left side of the first crossbeam 131 is connected to the first longitudinal beam 11 through the fifth fastener in the first hole 1111. The left side of the second crossbeam 132 is connected to the first longitudinal beam 11 through the fifth fastener in the second hole 1112.

[0062] The sixth connecting hole 112 includes a third hole 1121 and a fourth hole 1122, both of which can accommodate a sixth fastener. The second crossbeam assembly 14 includes a third crossbeam 141 and a fourth crossbeam 142. The sixth fastener in the third hole 1121 allows the left side of the third crossbeam 141 to be connected to the first longitudinal beam 11. The sixth fastener in the fourth hole 1122 allows the left side of the fourth crossbeam 142 to be connected to the first longitudinal beam 11.

[0063] The second longitudinal beam 12 is provided with a seventh connecting hole 121 and an eighth connecting hole 122. The seventh connecting hole 121 includes a fifth hole 1211 and a sixth hole 1212, and a seventh fastener can be inserted into both the fifth hole 1211 and the sixth hole 1212. The seventh fastener in the fifth hole 1211 connects the right side of the first crossbeam 131 to the second longitudinal beam 12, and the seventh fastener in the sixth hole 1212 connects the right side of the second crossbeam 132 to the second longitudinal beam 12. The eighth connecting hole 122 includes a seventh hole 1221 and an eighth hole 1222, and an eighth fastener can be inserted into both the seventh hole 1221 and the eighth hole 1222. The eighth fastener in the seventh hole 1221 connects the right side of the third crossbeam 141 to the second longitudinal beam 12, and the eighth fastener in the eighth hole 1222 connects the right side of the fourth crossbeam 142 to the second longitudinal beam 12.

[0064] In this example, multiple holes can be set for the first hole 1111, the second hole 1112, the third hole 1121, the fourth hole 1122, the fifth hole 1211, the sixth hole 1212, the seventh hole 1221, and the eighth hole 1222.

[0065] Among them, the fifth, sixth, seventh and eighth fasteners are thermoplastic self-tapping screws.

[0066] In one embodiment, such as Figure 6As shown, both the first longitudinal beam 11 and the second longitudinal beam 12 are provided with a third reinforcing rib 113 and a fourth reinforcing rib 114. The third reinforcing rib 113 is arranged along the vertical direction of the vehicle and can effectively transfer the Z-axis impact load from the vehicle chassis. The fourth reinforcing rib 114 is arranged along the longitudinal direction of the vehicle and can effectively transfer the rear impact load, improving the collision performance of the rear floor frame. At the same time, the third reinforcing rib 113 and the fourth reinforcing rib 114 are integrated, making the one-piece die-cast rear longitudinal beam structure continuous, which can not only transfer the Z-axis impact load, but also resist the X-axis collision load.

[0067] The third reinforcing bar 113 is a cross-shaped bar arranged along the Z direction. The fourth reinforcing bar 114 is a parallel bar that extends along the X direction.

[0068] In one embodiment, such as Figure 2 As shown, the second-row seat mounting bracket 20 includes a mounting frame 21, a first mounting part 22, and a second mounting part 23. The first mounting part 22 is located at the front end of the mounting frame 21 and is connected to the first crossbeam assembly 13. The second mounting part 23 is located at the rear end of the mounting frame 21 and is connected to the second crossbeam assembly 14. The mounting frame 21 serves as the main support for the second-row seat 200, bearing the weight of the seat and the occupants. Through the connection between the first mounting part 22 and the first crossbeam assembly 13, and the connection between the second mounting part 23 and the second crossbeam assembly 14, the seat can be firmly fixed to the rear floor frame 10, ensuring the stable fixation of the second-row seat mounting bracket 20.

[0069] As an example, the second-row seat mounting bracket 20 includes a mounting frame 21, a first mounting part 22, and a second mounting part 23. The second-row seat 200 is mounted on the mounting frame 21. The first mounting part 22 is located at the front end of the mounting frame 21 and is connected to the rear end of the first crossbeam assembly 13, which can be connected by snap-fit ​​or screw-fit. The second mounting part 23 is located at the rear end of the mounting frame 21 and is connected to the front end of the second crossbeam assembly 14, which can be connected by snap-fit ​​or screw-fit.

[0070] In one embodiment, such as Figure 2 As shown, the first mounting part 22 is connected to the lower part of the mounting frame 21, and the front end of the mounting frame 21 is located above the first crossbeam assembly 13.

[0071] The structural height of the first mounting part 22 can support the front end of the mounting frame 21, so that the front end of the mounting frame 21 is above the first crossbeam assembly 13. The front end of the mounting frame 21 is raised, which can make up for the height difference between the first crossbeam assembly 13 and the second crossbeam assembly 14, making the surface of the mounting frame 21 more stable, which facilitates the installation of the second row of seats 200.

[0072] As an example, the second crossbeam assembly 14 is higher than the first crossbeam assembly 13, and the first mounting part 22 is connected to the lower part of the mounting frame 21, which can raise the front end of the mounting frame 21 so that the height of the front end of the mounting frame 21 is closer to the height of the rear end of the mounting frame 21. This can counteract the tilt of the mounting frame 21 caused by the height difference between the crossbeam assemblies, making it easier to install the second row of seats 200.

[0073] In this design, the height of the front end of the mounting frame 21 can be the same as the height of the rear end, so that the surface of the mounting frame 21 is horizontal. Alternatively, the height of the front end of the mounting frame 21 can differ from the height of the rear end, so that the surface of the mounting frame 21 has a small angle relative to the horizontal surface. Neither method will affect the installation comfort of the second-row seat 200.

[0074] In one embodiment, such as Figure 2 As shown, the first mounting part 22 includes multiple support columns 221, which are connected between the front end of the mounting frame 21 and the rear end of the first crossbeam assembly 13. The multiple support columns 221 are spaced apart along the left-right direction of the vehicle. The front end of the mounting frame 21 is supported by the multiple support columns 221, and the upper end of the support column 221 is connected to the mounting frame 21, while the lower end of the support column 221 is connected to the first crossbeam assembly 13. The multiple support columns 221 enable the mounting frame 21 to be mounted on the first crossbeam assembly 13, distributing the load of the front end of the mounting frame to the first crossbeam assembly 13.

[0075] As an example, the first mounting section 22 includes a plurality of support columns 221, which are columnar structures and can be square, circular, or other irregular shapes. The support columns 221 are connected between the front end of the mounting frame 21 and the rear end of the first crossbeam assembly 13. Both the support columns 221 and the mounting frame 21 are part of the second-row seat mounting bracket 20, and are integrally die-cast. The support columns 221 and the first crossbeam assembly 13 can be connected by snap-fit ​​or screw-fit.

[0076] The number of support columns 221 can be determined based on the load on the mounting frame 21.

[0077] like Figure 2 As shown, there are four support columns 221. The four support columns 221 are spaced apart at the front end of the mounting frame 21 along the left and right directions of the vehicle. Two of the support columns 221 are located at the left and right ends of the front end of the mounting frame 21, and the remaining two support columns 221 are located at the middle position of the front end of the mounting frame 21.

[0078] Preferably, the four support columns 221 are evenly arranged along the left and right directions of the vehicle, which can evenly distribute the load of the mounting frame 21 to the first crossbeam assembly 13.

[0079] In one embodiment, such as Figure 2 As shown, the second mounting section 23 includes multiple connecting plates 231. The front end of the connecting plate 231 is connected to the mounting frame 21, and the rear end of the connecting plate 231 is connected to the front end of the second crossbeam assembly 14. The connecting plates 231 connect the rear end of the mounting frame 21 to the front end of the second crossbeam assembly 14. Furthermore, the multiple plate-like connecting plates 231 provide a large contact surface with the second crossbeam assembly 14, distributing the load on the rear end of the mounting frame 21 to the second crossbeam assembly 14, ensuring the connection strength of the rear end of the mounting frame 21, and improving structural reliability.

[0080] As an example, the second mounting section 23 includes a plurality of connecting plates 231, which are spaced apart along the left-right direction of the vehicle. The front end of each connecting plate 231 is connected to the mounting frame 21, and the rear end is connected to the second crossbeam assembly 14. Both the connecting plate 231 and the mounting frame 21 are part of the second-row seat mounting bracket 20, and the two are integrally die-cast. The front end of each connecting plate 231 can be connected to the second crossbeam assembly 14 by means of snap-fit ​​or screw connection.

[0081] The number of connecting plates 231 can be determined according to the load of the mounting frame 21.

[0082] like Figure 2 As shown, four connecting plates 231 are provided. The four connecting plates 231 are spaced apart along the left and right directions of the vehicle at the rear end of the mounting frame 21. Two connecting plates 231 are located at the left and right ends of the rear end of the mounting frame 21, and the remaining two connecting plates 231 are located at the middle position of the rear end of the mounting frame 21.

[0083] Preferably, the four connecting plates 231 are evenly arranged along the left and right directions of the vehicle, which can evenly distribute and transfer the load of the mounting frame 21 to the second crossbeam assembly 14.

[0084] As an example, the first mounting section 22 includes multiple support columns 221, and the second mounting section 23 includes multiple connecting plates 231. The front end of the mounting frame 21 is connected to the first crossbeam assembly 13 via the multiple support columns 221, and the rear end of the mounting frame 21 is connected to the second crossbeam assembly 14 via the multiple connecting plates 231. The support columns 221 and the first crossbeam assembly 13 are detachably connected, and the connecting plates 231 and the second crossbeam assembly 14 are detachably connected.

[0085] In one embodiment, the connecting plate 231 includes a first plate 2311 and a second plate 2312. The first plate 2311 is connected to the mounting frame 21, and the second plate 2312 is connected between the first plate 2311 and the second crossbeam assembly 14. The first plate 2311 and the second plate 2312 have an included angle, which can accommodate the height difference between the mounting frame 21 and the second crossbeam assembly 14.

[0086] In one embodiment, the rear end of the connecting plate 231 is provided with a first mounting hole 232, which is used to pass through the connecting plate fastener so that the rear end of the connecting plate 231 can be connected to the front end of the second crossbeam assembly 14. After the connecting plate fastener passes through the first mounting hole 232, it is connected to the front end of the second crossbeam assembly 14, which can fasten the connecting plate 231 to the second crossbeam assembly 14.

[0087] The first mounting hole 232 is provided on the second plate 2312, and the first mounting hole 232 extends through the second plate 2312 along its thickness direction. The fasteners of the connecting plate are bolts or screws, and are connected by screwing, which facilitates the assembly and disassembly of the connecting plate 231.

[0088] In one embodiment, such as Figure 3 , Figure 4 As shown, the second-row seat mounting bracket 20 is provided with a plurality of second mounting holes 24 and a plurality of third mounting holes 25. The second mounting holes 24 are provided on the mounting frame 21 and are used for seat fasteners to pass through so that the second-row seat 200 can be installed on the mounting frame 21. The third mounting holes 25 are provided on the first mounting part 22 and are used for frame fasteners to pass through so that the mounting frame 21 can be installed on the first crossbeam assembly 13.

[0089] By inserting a frame fastener through the third mounting hole 25, the first mounting part 22 can be mounted on the first crossbeam assembly 13, thereby connecting the mounting frame 21 and the first crossbeam assembly 13. By inserting a seat fastener through the second mounting hole 24, the second row seat 200 can be mounted on the mounting frame 21, thereby assembling the first crossbeam assembly 13, the second row seat mounting bracket 20, and the second row seat.

[0090] As an example, the second-row seat mounting bracket 20 includes a mounting frame 21, a first mounting part 22 and a second mounting part 23. The mounting frame 21 is provided with a second mounting hole 24, the first mounting part 22 is provided with a third mounting hole 25, and the second mounting part 23 is provided with a first mounting hole 232.

[0091] The second-row seat mounting bracket 20 is detachably connected between the second crossbeam 132 and the third crossbeam 141. A frame fastener can be inserted through the third mounting hole 25. The first mounting part 22 can be connected to the second crossbeam 132 through the frame fastener. The first mounting hole 232 is used to insert a connecting plate fastener. The second mounting part 23 can be connected to the third crossbeam 141 through the connecting plate fastener.

[0092] The second mounting hole 24 is provided in multiple ways. It can be used not only to connect the frame 21 to the second row seat 200 itself, but also to install accessories of the second row seat 200, such as seat belt buckles.

[0093] The mounting frame 21 has multiple through holes 217, the number of which is the same as the number of third mounting holes 25. Each through hole 217 communicates with the corresponding third mounting hole 25. The frame fastener passes through the through hole 217 and the third mounting hole 25 in sequence and is connected to the first crossbeam assembly 13, so that both the mounting frame 21 and the first mounting part 22 can be connected to the first crossbeam assembly 13.

[0094] The seat fasteners are bolts or screws. The frame fasteners are also bolts or screws, connected by a screw connection for easy assembly and disassembly of the first mounting part.

[0095] In one embodiment, such as Figure 2 As shown, the mounting frame 21 includes a front crossbeam 211, a rear crossbeam 212, and a plurality of third longitudinal beams 213. The plurality of third longitudinal beams 213 are connected between the front crossbeam 211 and the rear crossbeam 212, and a weight-reducing hole 214 is formed between adjacent third longitudinal beams 213. A first mounting part 22 is connected to the front crossbeam 211, a second mounting part 23 is connected to the rear crossbeam 212, and a second mounting hole 24 is provided between the front crossbeam 211 and the rear crossbeam 212.

[0096] In this embodiment, a supporting foundation is formed by the front crossbeam 211, the rear crossbeam 212, and the third longitudinal beam 213 to ensure the load-bearing performance of the seat. Weight-reduction holes 214 between adjacent third longitudinal beams 213 allow for weight reduction of the mounting frame 21. Second mounting holes 24 are provided on the front crossbeam 211 and the rear crossbeam 212; the second mounting holes 24 on the front crossbeam 211 correspond to the front mounting position of the seat, and the second mounting holes 24 on the rear crossbeam 212 correspond to the rear mounting position of the seat. This allows for fixed installation at both the front and rear positions of the seat, improving the installation stability of the second-row seat 200.

[0097] As an example, the mounting frame 21 includes a front crossbeam 211, a rear crossbeam 212, and a plurality of third longitudinal beams 213. The plurality of third longitudinal beams 213 are connected between the front crossbeam 211 and the rear crossbeam 212, and are spaced apart along the left-right direction of the vehicle. A first mounting part 22 is connected to the front crossbeam 211, and a plurality of through holes 217 are spaced apart on the front crossbeam 211. The front end of the seat is mounted on the front crossbeam 211, and the load is transferred to the first crossbeam assembly 13 through the front crossbeam 211 and the first mounting part 22. A second mounting part 23 is connected to the rear crossbeam 212, and the rear end of the seat is mounted on the rear crossbeam 212. The load is transferred to the second crossbeam assembly 14 through the rear crossbeam 212 and the second mounting part 23.

[0098] The number of second mounting holes 24 on the front crossbeam 211 and the number of second mounting holes 24 on the rear crossbeam 212 can be set according to the actual needs of the second row seats 200 and their accessories.

[0099] like Figure 3 The diagram illustrates the positions of the second mounting holes 24 on the front crossbeam 211 and the rear crossbeam 212. The front crossbeam 211 has nine second mounting holes 24, and the rear crossbeam 212 has four second mounting holes 24.

[0100] In one embodiment, such as Figure 4 As shown, the mounting frame 21 is provided with a first reinforcing rib 215 and a second reinforcing rib 216. The first reinforcing rib 215 is provided along the circumference of the second mounting hole 24 and the circumference of the third mounting hole 25. The second reinforcing rib 216 is provided between multiple second mounting holes 24, between multiple third mounting holes 25, and between the second mounting hole 24 and the third mounting hole 25.

[0101] The second mounting hole 24 is used for mounting the second-row seat 200 onto the mounting frame 21, and the third mounting hole 25 is used for mounting the mounting frame 21 onto the first crossbeam assembly 13. The second mounting hole 24 and the third mounting hole 25 are key nodes for load transfer. By setting the first reinforcing rib 215 around the second mounting hole 24 and the third mounting hole 25, the local strength around the hole can be increased, reducing the possibility of cracks after long-term use. In addition, the second reinforcing rib 216 connects the holes, and the area between the holes is reinforced by the second reinforcing rib 216, strengthening the local area. At the same time, the first reinforcing rib 215 and the second reinforcing rib 216 are integrated to form a crisscrossing "rib network", making the reinforcing rib structure on the entire mounting frame 21 coherent and improving the overall structural stability of the mounting frame 21.

[0102] As an example, the mounting frame 21 is provided with a first reinforcing rib 215 and a second reinforcing rib 216. The first reinforcing rib 215 is arranged along the circumference of the second mounting hole 24 and the third mounting hole 25. The first reinforcing rib 215 is a cross-shaped rib. The cross-shaped rib extends 3-4 sets of cross ribs from the second mounting hole 24 or the third mounting hole 25 as the origin, covering a large area and providing a good reinforcement effect.

[0103] The second reinforcing rib 216 is disposed between multiple second mounting holes 24, multiple third mounting holes 25, and between the second mounting holes 24 and the third mounting holes 25, that is, the second reinforcing rib 216 is disposed in the area between each hole. The second reinforcing rib 216 is a triangular intersecting rib, which can locally reinforce the area between the holes.

[0104] In this example, the first reinforcing rib 215 is precisely arranged around the second mounting hole 24 and the third mounting hole 25. By enhancing the material rigidity around the hole edge, it ensures that the connection nodes between the seat and the mounting frame 21, and between the mounting frame 21 and the first crossbeam assembly 13 are stable and reliable. The second reinforcing rib 216 connects the blank areas between multiple second mounting holes 24, multiple third mounting holes 25, and between the second mounting hole 24 and the third mounting hole 25, forming a crisscrossing rigid support network and improving the overall strength of the mounting frame 21.

[0105] In one embodiment, the rear floor frame structure 100 further includes a rear floor 30 connected to the rear floor frame 10, with the second-row seat mounting bracket 20 located above the rear floor 30. The connection between the rear floor 30 and the rear floor frame 10 strengthens the overall strength of the rear floor frame 10 and supports the weight of various components inside the vehicle.

[0106] Each crossbeam is equipped with a rear floor 30, which is a one-piece die-cast structure with a high degree of integration and fewer weld overlaps, which helps to improve the overall strength.

[0107] This application also provides a vehicle including the rear floor frame structure 100 of any of the above embodiments.

[0108] The seats inside the vehicle have different configurations. When the first type of vehicle is required, such as... Figure 8 As shown, the second-row seat mounting bracket 20 is installed between the first crossbeam assembly 13 and the second crossbeam assembly 14, and the second-row seat 200 is mounted on the second-row seat mounting bracket 20; when a second type of vehicle model is required, such as Figure 9As shown, the second-row seat mounting bracket 20 is removed. At this point, the first crossbeam assembly 13 and the second crossbeam assembly 14 serve as the mounting base. The second-row seat 200 is mounted on the first crossbeam assembly 13, and the third-row seat 300 is mounted on the second crossbeam assembly 14. In this embodiment, the installation and removal of the second-row seat mounting bracket 20 facilitates seat layouts for different vehicle models, allowing the same rear floor frame structure 100 to adapt to the design requirements of different vehicle models, thus improving the versatility of parts and production efficiency.

[0109] In this application, the vehicle is divided into rows from front to back, with the driver's seat as the "first row" as the sorting criterion. The seats behind the first row are defined as the second row of seats, and the seats behind the second row are defined as the third row of seats.

[0110] In this application, "multiple" refers to two or more.

[0111] In this application, unless otherwise expressly defined, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0112] The terms “first,” “second,” “third,” “fourth,” etc., used in this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence.

[0113] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A rear floor frame structure, characterized in that, Includes a rear floor frame and a second-row seat mounting bracket. The rear floor frame includes a first longitudinal beam, a second longitudinal beam, a first crossbeam assembly, and a second crossbeam assembly. The first crossbeam assembly and the second crossbeam assembly are connected between the first longitudinal beam and the second longitudinal beam. The first crossbeam assembly and the second crossbeam assembly are spaced apart along the front-rear direction of the vehicle. The first crossbeam assembly is provided with a second row seat mounting structure, the second crossbeam assembly is provided with a third row seat mounting structure, and the second row seat mounting bracket is detachably connected between the first crossbeam assembly and the second crossbeam assembly.

2. The rear floor frame structure according to claim 1, characterized in that, Along the vertical direction of the vehicle, the second crossbeam assembly is higher than the first crossbeam assembly.

3. The rear floor frame structure according to claim 1, characterized in that, The first crossbeam assembly includes a first crossbeam and a second crossbeam, which are spaced apart along the front-rear direction of the vehicle, with the first crossbeam located in front of the second crossbeam.

4. The rear floor frame structure according to claim 3, characterized in that, The second-row seat mounting structure includes a plurality of first connecting holes and a plurality of second connecting holes. The plurality of first connecting holes are spaced apart on the first crossbeam, and the plurality of second connecting holes are spaced apart on the second crossbeam. The first connecting holes are used for first fasteners to pass through to mount the front end of the second-row seat to the first crossbeam, and the second connecting holes are used for second fasteners to pass through to mount the rear end of the second-row seat to the second crossbeam.

5. The rear floor frame structure according to claim 3, characterized in that, The second crossbeam assembly includes a third crossbeam and a fourth crossbeam, the third crossbeam and the fourth crossbeam being spaced apart along the front-rear direction of the vehicle, the third crossbeam being located in front of the fourth crossbeam; The second row of seat mounting brackets are detachably connected between the second crossbeam and the third crossbeam.

6. The rear floor frame structure according to claim 5, characterized in that, The third-row seat mounting structure includes multiple third connecting holes and multiple fourth connecting holes. The multiple third connecting holes are spaced apart on the third crossbeam, and the multiple fourth connecting holes are spaced apart on the fourth crossbeam. The third connecting holes are used for third fasteners to pass through, so as to install the front end of the third-row seat onto the third crossbeam. The fourth connecting holes are used for fourth fasteners to pass through, so as to install the rear end of the third-row seat onto the fourth crossbeam.

7. The rear floor frame structure according to claim 5, characterized in that, The second row seat mounting bracket, the first longitudinal beam, the second longitudinal beam, the first crossbeam, the second crossbeam, the third crossbeam, and the fourth crossbeam are all integral die-cast structures.

8. The rear floor frame structure according to claim 1, characterized in that, The first longitudinal beam is provided with a first connecting structure and a second connecting structure, and the second longitudinal beam is provided with a third connecting structure and a fourth connecting structure; The first connecting structure is used to connect the left side of the first crossbeam assembly to the first longitudinal beam, and the second connecting structure is used to connect the left side of the second crossbeam assembly to the first longitudinal beam. The third connecting structure is used to connect the right side of the first crossbeam assembly to the second longitudinal beam, and the fourth connecting structure is used to connect the right side of the second crossbeam assembly to the second longitudinal beam.

9. The rear floor frame structure according to claim 1, characterized in that, The second-row seat mounting bracket includes a mounting frame, a first mounting part, and a second mounting part. The first mounting part is located at the front end of the mounting frame and is connected to the first crossbeam assembly. The second mounting part is located at the rear end of the mounting frame and is connected to the second crossbeam assembly.

10. The rear floor frame structure according to claim 9, characterized in that, The first mounting part is connected to the lower part of the mounting frame, and the front end of the mounting frame is located above the first crossbeam assembly.

11. The rear floor frame structure according to claim 9, characterized in that, The first mounting part includes a plurality of support columns, which are connected between the front end of the mounting frame and the rear end of the first crossbeam assembly. The multiple support columns are spaced apart along the left-right direction of the vehicle.

12. The rear floor frame structure according to claim 9, characterized in that, The second mounting part includes multiple connecting plates, the front end of which is connected to the mounting frame, and the rear end of which is connected to the front end of the second crossbeam assembly.

13. The rear floor frame structure according to claim 12, characterized in that, The rear end of the connecting plate is provided with a first mounting hole for inserting a fastener into the connecting plate, so that the rear end of the connecting plate can be connected to the front end of the second crossbeam assembly.

14. The rear floor frame structure according to claim 9, characterized in that, The second row seat mounting bracket is provided with multiple second mounting holes and multiple third mounting holes. The second mounting holes are provided in the mounting frame, and the multiple second mounting holes are used for seat fasteners to pass through, so that the second row seat can be installed in the mounting frame. The third mounting hole is provided in the first mounting part, and the plurality of the third mounting holes are used for the skeleton fasteners to pass through, so that the mounting skeleton can be installed on the first crossbeam assembly.

15. The rear floor frame structure according to claim 14, characterized in that, The mounting frame includes a front crossbeam, a rear crossbeam, and multiple third longitudinal beams. The multiple third longitudinal beams are connected between the front crossbeam and the rear crossbeam, and weight-reducing holes are formed between adjacent third longitudinal beams. The first mounting part is connected to the front crossbeam, the second mounting part is connected to the rear crossbeam, and the second mounting hole is provided between the front crossbeam and the rear crossbeam.

16. The rear floor frame structure according to claim 1, characterized in that, The rear floor frame structure also includes a rear floor connected to the rear floor frame, and the seat mounting structure is located above the rear floor.

17. The rear floor frame structure according to claim 16, characterized in that, The rear floor is a one-piece die-cast structure.

18. A vehicle, characterized in that, Includes the rear floor frame structure as described in any one of claims 1-17.

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