Rear floor assembly and vehicle

Abstract

The invention provides a rear floor assembly and a vehicle, the rear floor assembly relates to the technical field of vehicle body parts, the rear floor assembly comprises a rear floor longitudinal beam, a rear floor panel and a rear floor cross beam, the rear floor panel is partially sunken downwards to form a spare tire containing groove, the rear floor cross beam comprises a rear floor middle cross beam, and the rear floor middle cross beam is provided with a spare tire containing groove. The front side of the rear floor middle cross beam is connected with the rear floor panel, the middle of the rear side of the rear floor middle cross beam is connected with the front side wall of the spare tire containing groove in the left-right direction of the vehicle, the left portion and the right portion of the rear side of the rear floor middle cross beam are connected with the rear floor panel respectively, and a middle cross beam cavity is formed. According to the rear floor assembly, by improving the connecting mode of the cross beam in the rear floor, the size and space of the vehicle in the front-back direction can be saved, meanwhile, a spare tire containing groove can be formed, the occupied space of a trunk is not affected, a torsion beam rear suspension can be installed on the vehicle, a multi-connecting-rod rear suspension can also be installed on the vehicle, and the application range is wide.

Description

Technical Field

[0001] This invention relates to the field of vehicle component technology, and in particular to a rear floor assembly. Furthermore, this invention also relates to a vehicle using this rear floor assembly. Background Technology

[0002] With the development of vehicle technology, the number and types of vehicles are increasing, and the variety of vehicle components is also increasing. For example, the rear suspension of a vehicle includes not only the more conventional torsion beam rear suspension, but also the multi-link rear suspension. Although the multi-link rear suspension has advantages in weight and handling performance compared to the torsion beam rear suspension, it is difficult to install on some models due to the larger number of mounting points.

[0003] For example, in the existing technology, because A0-class small cars are small in overall size, they are generally equipped with torsion beam rear suspension. Although torsion beam rear suspension is inexpensive, it is heavy and has poor handling stability, which makes the driving experience of A0-class small cars poor. It is commonly used in low-end cars. In order to better meet customers' requirements for the driving experience, multi-link rear suspension is gradually being added to A0-class small cars.

[0004] In A0-class small cars, in order to accommodate the spare tire simultaneously without reducing the trunk volume, a portion of the rear floor panel is lowered along the vehicle's height to create a downward-facing spare tire compartment. Since the rear floor crossbeam is generally located on the rear floor panel, and the spare tire compartment is also located on the rear floor panel, arranging both the existing rear floor crossbeam and the spare tire compartment simultaneously would result in insufficient front-rear space. Therefore, the middle part of the rear floor crossbeam protrudes forward along the front-rear direction of the vehicle to accommodate the vehicle's front-rear dimensions.

[0005] However, due to the smaller wheelbase and rear overhang of A0-class small cars, and the fact that the rear floor crossbeam's position in the longitudinal direction must correspond to the rear shock absorber mounting points on the longitudinal beam, the two rear subframe mounting points of the multi-link suspension also need to be located on the rear floor crossbeam. If the middle of the rear floor crossbeam protrudes forward along the longitudinal direction, it is impossible to install the two rear subframe mounting points, thus preventing the installation of the rear subframe and consequently, the installation of a multi-link rear suspension. This results in A0-class small cars only being able to use a torsion beam rear suspension, and not a multi-link rear suspension. These factors lead to increased vehicle cost and weight, poor vehicle handling stability, a poor user experience, a low-end vehicle positioning, failure to meet the requirements for lightweight vehicles, and reduced market competitiveness.

[0006] On A0 subcompact cars, if a multi-link rear suspension is installed, the position of the crossbeam in the rear floor needs to be fixed. Due to the small wheelbase and rear overhang of A0 subcompact cars, if the position of the crossbeam in the rear floor is fixed, the rear floor panel can only be made flat, and it is not possible to install a spare tire storage compartment that sinks down along the vertical direction of the vehicle. However, making the rear floor panel flat will result in a very small trunk volume, and passengers cannot put too many items in it, resulting in a poor user experience. Summary of the Invention

[0007] In view of this, the present invention aims to provide a rear floor assembly that allows for the arrangement of a downwardly recessed spare tire receiving slot and facilitates the arrangement of a multi-link rear suspension.

[0008] To achieve the above objectives, the technical solution of the present invention is implemented as follows:

[0009] A rear floor assembly includes rear floor longitudinal beams arranged on the left and right sides of a vehicle, a rear floor panel connected between the rear floor longitudinal beams on both sides, and a rear floor crossbeam connected between the rear floor longitudinal beams on both sides and connected to the underside of the rear floor panel.

[0010] The rear floor panel is partially recessed to form a spare tire receiving groove;

[0011] The rear floor beam includes a middle beam in the rear floor, and the front side of the middle beam in the rear floor is connected to the rear floor panel.

[0012] Along the left-right direction of the vehicle, the rear middle part of the rear floor crossbeam is connected to the front sidewall of the spare tire receiving slot, and the rear left and right parts of the rear floor crossbeam are respectively connected to the rear floor panel, thus forming a crossbeam cavity extending along the left-right direction of the vehicle.

[0013] Furthermore, the rear floor crossbeam is provided with multiple rear subframe mounting parts, and the multiple rear subframe mounting parts are arranged at intervals along the left and right directions of the vehicle.

[0014] Furthermore, the middle crossbeam cavity is provided with a rear subframe mounting reinforcement plate, and there are multiple rear subframe mounting reinforcement plates, each corresponding to a rear subframe mounting part;

[0015] Furthermore, along the vertical direction of the vehicle, each of the rear subframe mounting reinforcement plates is located in the middle of the middle crossbeam cavity, which divides the middle crossbeam cavity into a first middle crossbeam sub-cavity and a second middle crossbeam sub-cavity arranged vertically.

[0016] Each of the aforementioned rear subframe mounting portions includes a rear subframe mounting hole provided on the middle crossbeam of the rear floor, and a rear subframe mounting sleeve located in the second middle crossbeam cavity and connected between the middle crossbeam of the rear floor and the rear subframe mounting reinforcement plate.

[0017] Furthermore, the rear floor crossbeam also includes a rear floor rear crossbeam, and a rear floor reinforcing beam connects the rear floor rear crossbeam and the rear floor middle crossbeam. The rear floor reinforcing beam is connected to the lower side of the bottom wall of the spare tire receiving compartment.

[0018] Furthermore, there are multiple rear floor reinforcement beams, which are arranged at intervals along the left-right direction of the vehicle.

[0019] Furthermore, there are two rear floor reinforcement beams, and each of the rear floor reinforcement beams gradually slopes outward from rear to front along the front direction of the vehicle.

[0020] Furthermore, the connection point between the rear floor reinforcing beam and the rear floor crossbeam is located near the rear subframe mounting section.

[0021] Furthermore, a reinforcing beam cavity is formed between the rear floor reinforcing beam and the bottom wall of the spare tire receiving groove, and the extension direction of the reinforcing beam cavity is set with the extension direction of the rear floor reinforcing beam.

[0022] Compared with the prior art, the present invention has the following advantages:

[0023] The rear floor assembly described in this invention improves the arrangement of the crossbeams in the rear floor, making the vehicle's front-to-rear space more compact. It is particularly suitable for A0-class small cars. The rear floor panel can be partially recessed to accommodate the spare tire compartment without taking up trunk space. This vehicle can be equipped with a torsion beam rear suspension, meeting the needs of some users with lower vehicle performance requirements, or a multi-link rear suspension, reducing vehicle weight and improving handling performance. This allows for diverse vehicle configurations, better meeting the needs of different customers.

[0024] Furthermore, by installing a rear subframe mounting section on the rear floor crossbeam and arranging multiple rear subframe mounting sections at intervals along the left-right direction of the vehicle, an existing multi-link rear suspension can be used, reducing vehicle weight and improving handling performance. Aligning the rear subframe mounting reinforcement plates with the rear subframe mounting sections one-to-one enhances the structural strength of the rear subframe mounting location, improving the reliability and stability of the rear subframe installation.

[0025] As for the rear subframe mounting reinforcement plate provided, it can make the cavity of the middle crossbeam form a cavity with a "day" - shaped cross - section, which can improve the structural strength of the rear floor middle crossbeam and enhance the force - transmission performance of the rear floor middle crossbeam. The rear subframe mounting part includes a rear subframe mounting hole and a rear subframe mounting sleeve, which can facilitate the connection with the existing rear subframe and help reduce the vehicle cost.

[0026] In addition, the provided rear floor reinforcement beam can not only strengthen the structural strength of the spare - tire mounting part, but also improve the overall structural strength and impact resistance of the rear floor assembly. The rear floor reinforcement beam can form an annular force - transmission structure with the rear floor rear crossbeam, the rear floor rear crossbeam, and the rear floor longitudinal beam, making the rear floor assembly have higher strength and stiffness.

[0027] Setting multiple rear floor reinforcement beams has a good effect of improving the overall structural strength and stiffness of the rear floor assembly, and can form a network - shaped force - transmission structure. Along the front - rear direction of the vehicle, each rear floor reinforcement beam gradually slopes outward from the rear to the front, which is beneficial to achieving a better force - transmission effect. Setting the connection point between the rear floor reinforcement beam and the rear floor middle crossbeam close to the rear subframe mounting part enables the force transmitted from the rear subframe to be respectively transmitted along the rear floor middle crossbeam and the rear floor reinforcement beam. Since the extension directions of the rear floor middle crossbeam and the rear floor reinforcement beam are different, it has a good effect of dispersing the transmitted force.

[0028] Furthermore, a reinforcement beam cavity is formed between the rear floor reinforcement beam and the bottom wall of the spare - tire accommodation groove. The extension direction of the reinforcement beam cavity is set along the extension direction of the rear floor reinforcement beam. By utilizing the characteristic of the large structural strength of the cavity, it can improve the reinforcement effect of the rear floor reinforcement beam and the overall weight is relatively light.

[0029] Another object of the present invention is to propose a vehicle provided with the rear floor assembly as described above.

[0030] For the vehicle of the present invention, by applying the above - mentioned rear floor assembly, the structure in the front - rear direction of the vehicle can be made more compact. It can make the local part of the rear floor panel sink downward to arrange the spare - tire accommodation groove without occupying the space of the trunk. On this vehicle, a torsion - beam rear suspension or a multi - link rear suspension can be installed, making the vehicle model configuration diversified, which is beneficial to better meeting the needs of different customers. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] The drawings forming a part of the present invention are used to provide a further understanding of the present invention. The schematic embodiments and descriptions thereof are used to explain the present invention and do not constitute an improper limitation to the present invention. In the drawings:

[0032] Figure 1 It is a schematic structural diagram of the rear floor assembly according to Embodiment 1 of the present invention;

[0033] Figure 2 For along Figure 1 Cross-sectional view of line AA;

[0034] Figure 3 For along Figure 1 Cross-sectional view of the middle BB line;

[0035] Figure 4 For along Figure 1 Cross-sectional view of the CC line;

[0036] Figure 5 This is a schematic diagram of the rear floor assembly without the rear floor panel assembled according to Embodiment 1 of the present invention;

[0037] Figure 6 For along Figure 1 Cross-sectional view of the DD line;

[0038] Figure 7 For along Figure 1 Cross-sectional view of the EE line.

[0039] Explanation of reference numerals in the attached figures:

[0040] 1. Rear floor longitudinal beams; 2. Rear floor panel; 3. Rear floor crossbeams; 4. Rear subframe mounting reinforcement plate; 5. Rear floor reinforcement beams;

[0041] 101. Vibration damper installation point;

[0042] 201. Middle floor; 202. Rear floor;

[0043] 2021. Spare tire compartment; 2022. Front sidewall; 2023. Bottom wall; 2024. Left sidewall; 2025. Right sidewall;

[0044] 301. Rear floor center crossbeam; 302. Rear floor rear crossbeam;

[0045] 3011. Left connecting section of the middle crossbeam; 3012. Middle section of the middle crossbeam; 3013. Right connecting section of the middle crossbeam; 3014. First middle crossbeam cavity; 3015. Second middle crossbeam cavity; 3016. Rear subframe mounting hole; 3017. Rear subframe mounting sleeve;

[0046] 3021. Left connecting section of the rear crossbeam; 3022. Middle section of the rear crossbeam; 3023. Right connecting section of the rear crossbeam. Detailed Implementation

[0047] It should be noted that, unless otherwise specified, the embodiments and features described in the present invention can be combined with each other.

[0048] In the description of this invention, it should be noted that the orientations or positional relationships shown in the accompanying drawings are merely for the convenience of describing the invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0049] Furthermore, in the description of this invention, unless otherwise explicitly defined, the terms "installation," "connection," "linking," and "connector" 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 of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention in light of the specific circumstances.

[0050] Furthermore, in the description of this invention, the directional terms such as "up," "down," "left," "right," "front," and "rear" used in the following embodiments are defined based on the vehicle's vertical direction (also known as the height direction or vehicle Z-direction), horizontal direction (also known as the width direction or vehicle Y-direction), and front-back direction (also known as the length direction or vehicle X-direction). "Inner" and "outer" are defined based on the outline of the corresponding component. For example, "inner" and "outer" are defined based on the vehicle outline, with the side of the vehicle outline closer to the center of the vehicle being "inner," and the opposite side being "outer."

[0051] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0052] Example 1

[0053] This embodiment relates to a rear floor assembly, which has a wide range of applications, especially suitable for A0-class small cars. With limited structure and space, the rear floor assembly can be equipped with a recessed spare tire receiving slot 2021, and can be fitted with existing torsion beam rear suspensions, as well as existing multi-link rear suspensions, such as two-link rear suspensions.

[0054] This allows the rear floor assembly to be suitable for manufacturing various vehicle configurations, especially for lightweight A0-class small cars with good handling performance and multi-link rear suspension. In addition, in this model, a recessed spare tire compartment 2021 can be arranged on the rear floor panel 2 without affecting the trunk space, which helps the vehicle better meet customer needs and thus enhances the vehicle's competitiveness.

[0055] Based on the above design concept, an exemplary structure of the rear floor assembly in this embodiment is as follows: Figure 1As shown, in terms of the overall structure, the rear floor assembly of this embodiment mainly includes rear floor longitudinal beams 1, a rear floor panel 2, and rear floor cross beams 3.

[0056] As Figure 1 Combined with Figure 5 As shown, there are two rear floor longitudinal beams 1 in this embodiment. Both of the two rear floor longitudinal beams 1 extend along the front - rear direction of the vehicle, and the two rear floor longitudinal beams 1 are arranged on the left and right sides of the vehicle respectively. The rear floor panel 2 is connected between the rear floor longitudinal beams 1 on both sides, and the rear floor cross beam 3 is connected between the rear floor longitudinal beams 1 on both sides. It specifically extends along the left - right direction of the vehicle, and the rear floor cross beam 3 is connected to the lower side of the rear floor panel 2.

[0057] Specifically, as Figure 1 and Figure 5 Combined with Figure 6 As shown, in this embodiment, a spare tire accommodation groove 2021 is formed by a part of the rear floor panel 2 recessing downward along the up - down direction of the vehicle, and the aforementioned rear floor cross beam 3 includes a rear floor middle cross beam 301.

[0058] More specifically, the front side of the rear floor middle cross beam 301 is connected to the rear floor panel 2. Along the left - right direction of the vehicle, the middle part of the rear side of the rear floor middle cross beam 301 is connected to the front side wall 2022 of the spare tire accommodation groove 2021, and the left and right parts of the rear side of the rear floor middle cross beam 301 are respectively connected to the rear floor panel 2, thereby forming a middle cross beam cavity extending along the left - right direction of the vehicle.

[0059] For the rear floor assembly of this embodiment, by defining that the rear side of the rear floor middle cross beam 301 is connected to the front side wall 2022 of the spare tire accommodation groove 2021, on the basis of ensuring the structural strength, as Figure 3 and Figure 4 As shown, compared with the existing rear floor middle cross beam 301 with a "C" - shaped cross - section, the rear floor middle cross beam 301 of this embodiment with a cross - section approximately in the shape of a "Z" can reduce the space it occupies in the front - rear direction of the vehicle.

[0060] Specifically, the overall rear floor middle cross beam 301 extends approximately along the left - right direction of the vehicle, and in the front - rear direction of the vehicle, the position of the rear floor middle cross beam 301 corresponds to the positions of the shock absorber mounting points 101 on both sides. Therefore, mounting points for the rear sub - frame can be arranged on the rear floor middle cross beam 301 as needed, so that the existing rear sub - frame can be installed, and thus the existing multi - link rear suspension can be installed.

[0061] In this embodiment, the spare tire receiving slot 2021 is open at the rear and is specifically located on the rear floor 202 described below. The other structures of the rear floor 202 can refer to existing structures. The spare tire receiving slot 2021 is recessed downwards along the vertical direction of the vehicle according to the size, position, and shape of the spare tire. The left side wall 2021, right side wall 2025, and front side wall 2022 of the spare tire receiving slot 2021 can maintain a safety clearance of at least 10mm from the spare tire in all directions, so that the spare tire can be placed completely flat in the spare tire receiving slot 2021 without occupying the trunk volume.

[0062] It should be noted that the rear floor longitudinal beams 1 on both sides are symmetrical about the rear floor panel 2 in the left-right direction of the vehicle. Therefore, the following description will take the left rear floor longitudinal beam 1 as an example to illustrate its structure. Figure 1 and Figure 2 As shown, the structure of the rear floor longitudinal beam 1 can refer to the existing structure.

[0063] In this embodiment, the rear floor longitudinal beam 1 mainly includes an upper longitudinal beam plate and a lower longitudinal beam plate. The upper and lower longitudinal beam plates form a longitudinal beam cavity, and the length of the longitudinal beam cavity extends along the front-rear direction of the vehicle, which can effectively improve the structural strength of the rear floor longitudinal beam 1.

[0064] In a preferred embodiment, for ease of processing, longitudinal beam flanges are provided on both the left and right sides of the lower longitudinal beam plate, making the cross-section of the lower longitudinal beam plate "Z"-shaped, which has good structural strength. The longitudinal beam flange on the inner side of the lower longitudinal beam plate is the longitudinal beam flange facing the rear floor panel 2, which is stacked and welded together with the upper longitudinal beam plate and the rear floor panel 2.

[0065] Furthermore, in the longitudinal direction of the vehicle, the lower longitudinal beam includes a front section and a rear section, which are arranged front to back and connected together. To further improve the structural strength of the rear floor longitudinal beam 1, a longitudinal beam reinforcing plate is also provided inside the longitudinal beam cavity. Preferably, the cross-section of the longitudinal beam reinforcing plate is "U" shaped, which overlaps with and is welded together with the aforementioned lower longitudinal beam, effectively improving the structural strength of the rear floor longitudinal beam 1.

[0066] like Figure 1 , Figures 3 to 5 As shown, the rear floor crossbeam 301 in this embodiment mainly comprises three sections. In the left-right direction of the vehicle, the rear floor crossbeam 301 mainly includes a left connecting section 3011, a middle section 3012, and a right connecting section 3013. The left connecting section 3011, the middle section 3012, and the right connecting section 3013 are connected sequentially, and the left connecting section 3011 and the right connecting section 3013 are symmetrically arranged about the middle section 3012 in the left-right direction of the vehicle.

[0067] When the rear floor crossbeam 301 is installed on a vehicle, the left connecting section 3011 of the crossbeam connects between the middle section 3012 of the crossbeam and the left rear floor longitudinal beam 1, and the right connecting section 3013 of the crossbeam connects between the middle section 3012 of the crossbeam and the right rear floor longitudinal beam 1. This not only makes it easier to process the three parts of the crossbeam separately—the left connecting section 3011, the middle section 3012, and the right connecting section 3013—but also facilitates the connection of these parts.

[0068] In terms of specific structure, it still refers to Figure 5 As shown, in the left-right direction of the vehicle, the size of the left connecting section 3011 of the middle crossbeam gradually increases from right to left in the front-rear direction of the vehicle. This makes the cross-sectional area of ​​the middle crossbeam cavity gradually increase from right to left in the left-right direction of the vehicle. This not only facilitates the connection with the rear floor longitudinal beam 1 and improves the connection reliability between the rear floor middle crossbeam 301 and the rear floor longitudinal beam 1, but also improves the impact resistance of the rear floor assembly and has a good effect of mitigating stress impact.

[0069] More specifically, the left connecting section 3011 of the middle crossbeam has a crossbeam overlap portion that overlaps with the rear floor longitudinal beam 1, and both the front and rear sides of the left connecting section 3011 of the middle crossbeam are provided with panel connecting flanges and longitudinal beam connecting flanges. The panel connecting flanges extend along the left-right direction of the vehicle and are welded to the rear floor panel 2, while the longitudinal beam connecting flanges extend along the height direction of the vehicle and are welded to the rear floor longitudinal beam 1, which can effectively improve the connection reliability between the left connecting section of the crossbeam and the rear floor longitudinal beam 1.

[0070] In the left-right direction of the vehicle, the left connecting section 3011 of the middle crossbeam and the middle section 3012 of the middle crossbeam have an overlapping part that overlaps with each other. The overlapping part is connected by welding, which can improve the connection reliability between the left connecting section 3011 of the middle crossbeam and the middle section 3012 of the middle crossbeam.

[0071] Continue to refer to Figure 5 As shown, along the left-right direction of the vehicle, the dimensions of the middle section 3012 of the middle crossbeam gradually increase and then decrease in the front-rear direction of the vehicle, and then increase and then decrease again. The middle section 3012 of the middle crossbeam is symmetrical about the center line of the vehicle in the left-right direction. The front side of the middle section 3012 of the middle crossbeam extends along the left-right direction of the vehicle. The middle rear side of the middle section 3012 is arc-shaped in the middle of the left-right direction of the vehicle. On the same side as the curvature of the front side wall 2022 of the aforementioned spare tire receiving groove 2021, the left and right ends of the middle section 3012 of the middle crossbeam are also arc-shaped, and are smoothly connected to the left side connecting section 3011 or the right side connecting section 3013 of the middle crossbeam at the corresponding ends.

[0072] More specifically, such as Figure 1 , Figure 4 and Figure 5As shown, a front flanging is provided on the front side of the middle section 3012 of the middle cross member. The front flanging can be welded to the rear floor panel 2, thereby improving the connection reliability between the rear floor middle cross member 301 and the rear floor panel 2. A middle flanging is provided in the middle of the rear side of the middle section 3012 of the middle cross member. The middle flanging is in contact with and welded to the front side wall 2022 of the spare tire accommodation groove 2021. End flangings are provided at the left and right ends of the rear side of the middle section 3012 of the middle cross member. The end flangings are in contact with and welded to the rear floor panel 2, which can preferably improve the connection reliability between the rear floor middle cross member 301 and the rear floor panel 2.

[0073] It should be noted that the cross-sectional shape of the existing rear floor middle cross member 301 is generally "U" - shaped and is connected to the lower side of the rear floor panel 2, occupying a relatively large space in the vehicle's front - rear direction.

[0074] In this embodiment, along the left - right direction of the vehicle, the cross - section of the middle part of the rear floor middle cross member 301 is "Z" - shaped, and the cross - sections of the left and right ends of the rear floor middle cross member 301 are "U" - shaped. With this setting, compared with the existing rear floor middle cross member 301 whose cross - section is "U" - shaped at any position, the rear floor middle cross member 301 in this embodiment can save more space in the vehicle's front - rear direction, thus facilitating the arrangement of the spare tire accommodation groove 2021 on the rear floor panel 2.

[0075] At the same time, the extending direction of the rear floor middle cross member 301 in this embodiment is along the left - right direction of the vehicle. Only the shape of the rear - side edge of the rear floor middle cross member 301 is in the shape of three arcs connected in sequence. This not only effectively ensures the connection reliability with surrounding components, but also the two ends of the rear floor middle cross member 301 can still be respectively arranged corresponding to the shock absorber mounting points on the rear floor longitudinal beam 1. A rear sub - frame mounting part can also be arranged on the rear floor middle cross member 301, so that a sub - frame suitable for installing a multi - link rear suspension can be installed on the rear floor assembly. Thus, when applied to the manufacture of A0 - class small cars, a multi - link rear suspension can be installed, thereby improving the vehicle's handling stability, reducing the vehicle's total weight, and enhancing the vehicle's market competitiveness.

[0076] It should be noted that in this embodiment, the rear floor middle cross member 301 is taken as an example, which is divided into a left - side connection section 3011, a middle section 3012, and a right - side connection section 3013 of the middle cross member. It should be understood that for the convenience of processing and assembly, the rear floor middle cross member 301 can of course be integrally formed or divided into other numbers of segments other than three.

[0077] It should also be noted that, although the rear floor assembly of this embodiment can accommodate a spare tire compartment 2021 and a suitable rear subframe, allowing for the integration of a multi-link rear suspension on the vehicle, it should be understood that due to varying consumer spending levels, some may prioritize lower prices and have less demanding requirements for weight and handling stability. Therefore, in this embodiment, the rear subframe mounting portion on the crossbeam 301 of the rear floor can be configured according to actual needs.

[0078] In other words, when this rear floor assembly is used to manufacture A0-class small cars, a torsion beam rear suspension can be used in models with a spare tire compartment 2021. However, this results in higher weight and poorer handling stability, but the price is relatively lower. In addition to using a torsion beam rear suspension, a multi-link rear suspension can also be used, which not only allows the vehicle to better meet the requirements of lightweight technology, but also improves handling stability.

[0079] Therefore, the rear floor assembly of this embodiment enables the successful integration of a multi-link rear suspension on an A0-class small car with a spare tire receiving slot 2021, and the A0-class small car can be manufactured in various configurations to better meet customer needs.

[0080] To facilitate the installation of the rear subframe and thus the multi-link rear suspension, as a preferred embodiment, the rear floor crossbeam 301 is provided with multiple rear subframe mounting parts, which are arranged at intervals along the left and right directions of the vehicle.

[0081] In this structure, a rear subframe mounting part is provided on the crossbeam 301 in the rear floor, and multiple rear subframe mounting parts are arranged at intervals along the left and right directions of the vehicle. Existing multi-link rear suspension can be used, which reduces the weight of the vehicle and helps to improve the handling performance of the vehicle.

[0082] As in this embodiment, refer to Figure 5 As shown, there are two rear subframe mounting points, which are spaced apart along the left and right directions of the vehicle. It should be understood that this type of rear subframe mounting is suitable for mounting existing two-link rear suspensions, and is especially suitable for designs where the rear subframe mounting points need to be located on the rear floor crossbeam 301, and both ends of the rear floor crossbeam 301 are located close to the shock absorber mounting points, and the rear floor crossbeam 301 extends in a roughly straight line along the left and right directions of the vehicle.

[0083] To improve the structural strength of the crossbeam 301 in the rear floor, such as Figure 1 and Figure 4As shown, as a preferred embodiment, a rear subframe mounting reinforcement plate 4 is provided inside the middle crossmember cavity. In the vertical direction of the vehicle, the rear subframe mounting reinforcement plate 4 is located in the middle of the middle crossmember cavity. With such an arrangement, the rear subframe mounting reinforcement plate 4 divides the middle crossmember cavity into a first middle crossmember sub-cavity 3014 and a second middle crossmember sub-cavity 3015 arranged vertically.

[0084] In this embodiment, the provided rear subframe mounting reinforcement plate 4 can make the middle crossmember cavity form a cavity with a "day" - shaped cross-section, which can improve the structural strength of the rear floor middle crossmember 301 and enhance the force transmission performance of the rear floor middle crossmember 301.

[0085] Specifically, the cross-sectional shape of the rear subframe mounting reinforcement plate 4 is also roughly "Z" - shaped. Still referring to Figure 4 As shown, on the front and rear sides of the rear subframe mounting reinforcement plate 4, there are respectively a front side flange of the reinforcement plate and a rear side flange of the reinforcement plate. The front side flange of the reinforcement plate is folded upwards and is fixedly welded to the front side wall 2022 of the middle crossmember cavity on the rear floor middle crossmember 301, while the rear side flange of the reinforcement plate is folded downwards and is fixedly welded to the rear side wall of the middle crossmember cavity on the rear floor panel 2, which can preferably improve the installation stability and reliability of the rear subframe mounting reinforcement plate 4 and can preferably improve the structural strength of the rear floor middle crossmember 301.

[0086] In order to improve the structural strength of the rear subframe mounting reinforcement plate 4 itself, in a preferred embodiment, on the left and right sides of the rear subframe mounting reinforcement plate 4, there are respectively a left side flange of the reinforcement plate and a right side flange of the reinforcement plate. The left side flange of the reinforcement plate and the right side flange of the reinforcement plate are both fixedly welded to the rear floor middle crossmember 301. This can not only preferably improve the structural strength of the rear subframe mounting reinforcement plate 4 itself, but also enhance the strengthening effect of the rear subframe mounting reinforcement plate 4, which is beneficial to improving the structural strength of the rear subframe mounting position.

[0087] In the above structure, the provided rear subframe mounting reinforcement plate 4 is welded to the rear floor middle crossmember 301. After they are combined, they can form a complete "square" - shaped cavity, which has a good effect of improving the structural strength and stiffness of the rear subframe mounting point.

[0088] In order to reduce the overall weight, as a preferred embodiment, there are multiple rear subframe mounting reinforcement plates 4. The rear subframe mounting reinforcement plates 4 correspond to the rear subframe mounting parts one by one, that is, multiple rear subframe mounting reinforcement plates 4 are arranged at intervals in the left - right direction of the vehicle. In this embodiment, there are two rear subframe mounting reinforcement plates 4, and the two rear subframe mounting reinforcement plates 4 respectively correspond to the two rear subframe mounting parts one by one, which is beneficial to improving the structural strength of the rear subframe mounting position, can ensure the stability and reliability of the rear subframe installation, and at the same time has a relatively light weight.

[0089] It should be understood that the number of rear subframe mounting reinforcement plates 4 can be other values in addition to two. For example, there can be one rear subframe mounting reinforcement plate 4, which is in a long strip shape extending in the left - right direction of the vehicle. Or, the number of rear subframe mounting reinforcement plates 4 can be three, four, etc. In addition to arranging the rear subframe mounting reinforcement plates 4 corresponding to the aforementioned rear subframe mounting parts, the rear subframe mounting reinforcement plates 4 can also be arranged at other positions in the left - right direction of the vehicle, such as in the middle.

[0090] Still referring to Figure 4 and Figure 5 As shown, as a preferred embodiment, each rear subframe mounting part includes a rear subframe mounting hole 3016 provided on the rear floor middle cross - beam 301, and a rear subframe mounting sleeve 3017 located within the second middle cross - beam cavity 3015 and connected between the rear floor middle cross - beam 301 and the rear subframe mounting reinforcement plate 4.

[0091] Here, making the rear subframe mounting part include the rear subframe mounting hole 3016 and the rear subframe mounting sleeve 3017 can facilitate the connection with the existing rear subframe, which is beneficial to reducing the vehicle cost. The rear subframe mounting reinforcement plate 4 and the rear subframe mounting sleeve 3017 can form an assembly through MIG welding, and then be welded to the rear floor panel 2 and the rear floor middle cross - beam 301.

[0092] In this embodiment, at the Figure 4 shown position, the size of the middle cross - beam cavity in the front - rear direction of the vehicle is preferably 75mm - 85mm. For example, it can be 75mm, 80mm, and 85mm. And the cross - sectional shapes of both the rear floor middle cross - beam 301 and the rear subframe mounting reinforcement plate 4 are in a "Z" shape, thus forming a middle cross - beam cavity with a cross - section in the shape of a "day" character, which has a good effect of improving the structural strength of the rear subframe mounting points.

[0093] During specific assembly, first weld the rear subframe mounting reinforcement plate 4 and the rear subframe mounting sleeve 3017 together, then combine this structure with the rear floor middle cross - beam 301, and finally combine it with the rear floor panel 2.

[0094] The flanging at the front end of the rear floor middle cross - beam 301 and the following middle floor 201, rear floor 202, and the rear floor reinforcement beams 5 on the left and right sides are welded in three layers by spot welding in the up - down direction of the vehicle. The flanging at the rear end of the rear floor middle cross - beam 301 and the front side wall 2022 on the rear floor panel 2 are welded in three layers by spot welding in the front - rear direction of the vehicle. In this way, a complete middle cross - beam cavity can be formed, and the rear subframe mounting reinforcement plate 4 changes the cavity into a cavity with a cross - section in the shape of a "day" character, which can greatly improve the strength and dynamic stiffness of the rear subframe mounting points.

[0095] As Figure 5As shown, in order to improve the overall structural strength of the rear floor assembly, as a preferred embodiment, the rear floor cross member 3 further includes a rear floor rear cross member 302. A rear floor reinforcement beam 5 is connected between the rear floor rear cross member 302 and the rear floor middle cross member 301. The rear floor reinforcement beam 5 is specifically connected to the lower side of the bottom wall 2023 of the spare tire accommodation groove 2021.

[0096] Specifically, the rear floor rear cross member 302 is arranged passing through the center of the spare tire accommodation groove 2021. In the vehicle's front-rear direction, the rear floor rear cross member 302 is symmetrically arranged about the straight line passing through the center of the spare tire accommodation groove 2021 in the vehicle's left-right direction. And the width of the rear floor rear cross member 302 in the vehicle's front-rear direction is preferably 35 mm - 45 mm, such as it can be 35 mm, 40 mm or 45 mm, and the dimension in the vehicle's up-down direction is preferably 18 mm - 22 mm, such as it can be 18 mm, 20 mm or 22 mm.

[0097] In this embodiment, the provided rear floor reinforcement beam 5 can not only strengthen the structural strength of the spare tire installation part, but also improve the overall structural strength and impact resistance of the rear floor assembly. And the rear floor reinforcement beam 5 can form an annular force transmission structure with the rear floor rear cross member 302, the rear floor rear cross member 302 and the rear floor longitudinal beam 1, making the rear floor assembly have higher strength and stiffness.

[0098] In terms of the specific structure, the cross section of the rear floor rear cross member 302 is in a "U" shape. There are respectively a front side flange of the rear cross member and a rear side flange of the rear cross member on the front side and the rear side of the rear floor rear cross member 302. The front side flange of the rear cross member and the rear side flange of the rear cross member are respectively welded to the rear floor panel 2, which can preferably improve the structural strength of the rear floor rear cross member 302 part.

[0099] As Figure 1 and Figure 7 shown, a rear cross member cavity is formed between the rear floor rear cross member 302 and the rear floor panel 2. The rear cross member cavity extends in the vehicle's left-right direction, and the characteristics of large structural strength of the cavity structure can be utilized to further preferably improve the structural strength of the rear floor rear cross member 302 part.

[0100] More specifically, still referring to Figure 1 and Figure 5 shown, in the vehicle's left-right direction, the rear floor rear cross member 302 is divided into three sections, including a left connecting section 3021 of the rear cross member, a middle section 3022 of the rear cross member and a right connecting section 3023 of the rear cross member connected in sequence from left to right. The left connecting section 3021 of the rear cross member and the right connecting section 3023 of the rear cross member are symmetric about the middle section 3022 of the rear cross member. And the left connecting section 3021 of the rear cross member is connected to the left rear floor longitudinal beam 1, and the right connecting section 3023 of the rear cross member is connected to the right rear floor longitudinal beam 1. It is convenient for the processing of each component and the overall layout.

[0101] When the rear floor crossbeam 302 is installed on a vehicle, it is divided into three sections connected sequentially along the left and right directions of the vehicle. This not only makes it easier to process the three parts of the rear crossbeam, namely the left connecting section 3021, the middle section 3022, and the right connecting section 3023, but also makes it easier to connect the parts.

[0102] In terms of specific structure, it still refers to Figure 5 As shown, in the left-right direction of the vehicle, the size of the left connecting section 3021 of the rear crossbeam gradually increases from right to left, and in the front-rear direction of the vehicle. This makes the cross-sectional area of ​​the rear crossbeam cavity gradually increase from right to left in the left-right direction of the vehicle. This not only facilitates the connection with the rear floor longitudinal beam 1, but also improves the connection reliability between the rear floor rear crossbeam 302 and the rear floor longitudinal beam 1, and improves the impact resistance of the rear floor assembly, but also has a good effect of mitigating stress impact.

[0103] More specifically, the left connecting section 3021 of the rear crossbeam has a longitudinal beam overlap portion that overlaps with the longitudinal beam 1 of the rear floor. On both the front and rear sides of the left connecting section 3021 of the rear crossbeam, there are panel connecting flanges and longitudinal beam connecting flanges. The panel connecting flanges extend along the left and right direction of the vehicle and are welded to the rear floor panel 2, while the longitudinal beam connecting flanges extend along the height direction of the vehicle and are welded to the longitudinal beam 1 of the rear floor. This can improve the connection reliability between the left connecting section 3021 of the rear crossbeam and the longitudinal beam 1 of the rear floor.

[0104] In the left-right direction of the vehicle, the left connecting section 3021 of the rear crossbeam and the middle section 3022 of the rear crossbeam have an overlapping part that overlaps with each other. The overlapping part is connected by welding, which can improve the connection reliability between the left connecting section 3021 of the rear crossbeam and the middle section 3022 of the rear crossbeam.

[0105] It should be noted that the rear floor crossbeam 3 in this embodiment may include not only the rear floor middle crossbeam 301 and the rear floor rear crossbeam 302, but also the rear floor front crossbeam (not shown in the figure). The length direction of the rear floor front crossbeam extends along the left and right direction of the vehicle. Its structure can be referred to the existing structure. In the front and rear direction of the vehicle, the rear floor front crossbeam, the rear floor middle crossbeam 301 and the rear floor rear crossbeam 302 are arranged sequentially from front to back along the front and rear direction of the vehicle.

[0106] To improve the overall structural strength of the rear floor assembly, as a preferred embodiment, multiple rear floor reinforcing beams 5 are arranged at intervals along the left-right direction of the vehicle. Using multiple rear floor reinforcing beams 5 effectively improves the overall structural strength and rigidity of the rear floor assembly.

[0107] Considering the overall structural strength of the vehicle, as a preferred implementation method, in this embodiment, there are two rear floor reinforcement beams 5. Along the front-rear direction of the vehicle, each rear floor reinforcement beam 5 gradually tilts outward from the rear to the front, which is conducive to achieving a better force transmission effect.

[0108] Specifically, whether the impact force is transmitted to the middle crossbeam 301 of the rear floor or to the rear crossbeam 302 of the rear floor, it is easily transmitted to the other party through the rear floor reinforcement beam 5. Moreover, since the rear floor reinforcement beam 5 is arranged at an angle, it can decompose and consume part of the impact force, thereby reducing the force transmitted to the other party and improving the impact resistance of the rear floor assembly.

[0109] To improve the force transmission effect of the rear floor assembly, as a preferred embodiment, the connection point between the rear floor reinforcing beam 5 and the rear floor crossbeam 301 is located near the rear subframe mounting portion. Here, by positioning the connection point between the rear floor reinforcing beam 5 and the rear floor crossbeam 301 near the rear subframe mounting portion, the force transmitted from the rear subframe can be transmitted along the rear floor crossbeam 301 and the rear floor reinforcing beam 5 respectively. Since the rear floor crossbeam 301 and the rear floor reinforcing beam 5 extend in different directions, this provides a better effect of dispersing force transmission.

[0110] In terms of specific structure, in order to improve the force transmission effect of the rear floor reinforcement beam 5, in this embodiment, the front side of the rear floor reinforcement beam 5 is provided with a flange. The flange is folded upward and welded to the front side wall 2022 of the spare tire receiving groove 2021, which can better improve the structural reinforcement effect of the rear floor panel 2. In the left and right direction of the vehicle, the setting position of the flange on the front side of the rear floor reinforcement beam 5 is also corresponding to the position of the flange on the rear side of the reinforcement plate on the rear subframe mounting reinforcement plate 4.

[0111] The rear flange of the reinforcing plate is also attached to the front sidewall 2022 of the spare tire receiving slot 2021, and it is connected to the flange on the front side of the rear floor reinforcing beam 5. The rear flange of the reinforcing plate and the front flange of the rear floor reinforcing beam 5 overlap and form a three-layer weld with the front sidewall 2022 in the longitudinal direction of the vehicle. With this configuration, the force transmitted from the rear subframe to the middle crossbeam 301 of the rear floor can be better transmitted rearward through the rear floor reinforcing beam 5, which can improve the absorption and dispersion of the force.

[0112] In order to improve the structural reinforcement effect of the rear floor reinforcement beam 5 on the rear floor assembly, as a preferred embodiment, a reinforcement beam cavity is formed between the rear floor reinforcement beam 5 and the bottom wall 2023 of the spare tire receiving groove 2021, and the extension direction of the reinforcement beam cavity is set in the extension direction of the rear floor reinforcement beam 5.

[0113] Here, a reinforcing beam cavity is formed between the rear floor reinforcing beam 5 and the bottom wall 2023 of the spare tire accommodation groove 2021, and the extending direction of the reinforcing beam cavity is set along the extending direction of the rear floor reinforcing beam 5. The characteristics of large structural strength of the cavity can be utilized to improve the strengthening effect of the rear floor reinforcing beam 5, and the overall weight is relatively light.

[0114] In this embodiment, flanges are provided on both the left and right sides of the rear floor reinforcing beam 5. The rear floor reinforcing beam 5 is connected to the rear floor panel 2 by fillet welding through the flanges on both sides, and more welding points can be arranged, which is beneficial to improving the connection reliability between the rear floor reinforcing beam 5 and the rear floor panel 2.

[0115] In addition, the rear floor reinforcing beam 5 also has a lapping part lapping on the rear floor rear cross beam 302. At the connection part between the rear floor reinforcing beam 5 and the rear floor rear cross beam 302, the shape of the rear floor reinforcing beam 5 conforms to the shape of the rear floor rear cross beam 302, so that there is a large contact area between the rear floor reinforcing beam 5 and the rear floor rear cross beam 302, which is beneficial to improving the connection reliability between the two.

[0116] It should be noted that in this embodiment, the two rear floor reinforcing beams 5 are symmetrically arranged about the center line in the vehicle's left-right direction, and the connection parts of the rear parts of the two rear floor reinforcing beams 5 and the rear floor rear cross beam 302 are arranged adjacent to each other, which is convenient for overall layout and can achieve a better effect of improving the structural strength and force transmission performance of the rear floor assembly.

[0117] The specific setting position of the rear floor reinforcing beam 5 is as follows: select a point at the rear subframe mounting point, and select a point 40 mm - 50 mm, such as 45 mm, along the vehicle's left-right direction at the front end of the rear floor rear cross beam 302. The two points intersect to form a straight line. Taking this straight line as the center line, offset 25 mm - 30 mm, such as 25 mm, to both sides. At the same time, in the vehicle's up-down direction, the large surface of the rear floor reinforcing beam 5 is consistent with the large surface of the rear floor rear cross beam 302, and a rear floor reinforcing beam 5 with a width of 50 mm - 60 mm and a height of 20 mm can be made.

[0118] Refer to Figure 1 and Figure 4 As shown in, the flanges on both the left and right sides of the rear floor reinforcing beam 5 are welded to the rear floor panel 2 and the rear floor rear cross beam 302 in the vehicle's up-down direction, and the flanges extending forward are welded to the rear subframe mounting reinforcement plate 4 and the rear floor panel 2 in the vehicle's front-rear direction to form a three-layer weld. The rear part of the rear floor reinforcing beam 5 is welded to the rear floor rear cross beam 302, so that at the connection part between the cavity of the rear floor reinforcing beam 5 and the cavity of the rear floor rear cross beam 302, a "day" - shaped cavity section is formed, which can better transfer the stress of the rear shock absorber and the rear subframe to the vehicle and dissipate it.

[0119] Finally, it should be noted that as Figure 3and Figure 4 As shown, for the convenience of processing, the rear floor panel 2 in this embodiment mainly includes a middle floor 201 and a rear floor 202. The middle floor 201 and the rear floor 202 are arranged front and rear, and the rear side edge of the middle floor 201 and the front side edge of the rear floor 202 partially overlap, facilitating the welding of the middle floor 201 and the rear floor 202 together.

[0120] In this embodiment, the aforementioned spare tire accommodating groove 2021 is specifically provided on the rear floor 202, and the boundary line between the middle floor 201 and the rear floor 202 is approximately located at the position of the front side wall 2022 of the spare tire accommodating groove 2021. In a preferred embodiment, the overlapping part of the rear side edge of the middle floor 201 and the front side edge of the rear floor 202 includes straight line segments at the left and right ends, and an arc segment connecting the straight line segments at the left and right ends. The bending direction of the arc segment is the same as the bending direction of the front side wall 2022 of the accommodating groove, so that the connection part between the middle floor 201 and the rear floor 202 has relatively high reliability.

[0121] It should still be noted that, continuing to refer to Figure 4 As shown, in this embodiment, the front side edge of the aforementioned rear floor middle cross member 301 is connected to the middle floor 201, and the left and right ends of the rear side of the rear floor middle cross member 301 are respectively connected to the rear floor 202, which can preferably improve the overall structural strength and connection reliability. It should be noted that in addition to dividing the rear floor panel 2 into the middle floor 201 and the rear floor 202, the rear floor panel 2 can also be integrally formed.

[0122] In the rear floor assembly, the most important are the rear impact, the force transmission during low-speed rear impact, the dynamic stiffness of the mounting points of the chassis rear suspension, and the torsional stiffness of the vehicle. When there is a spare tire, the strength and mode of the rear floor panel 2 also need to be improved. And this solution supports the rear floor panel 2 through the rear floor rear cross member 302 and the rear floor strengthening beams on the left and right sides, which can ensure the overall mode of the rear floor panel 2 after placing the spare tire.

[0123] In addition, in terms of torsional stiffness, collision performance, dynamic stiffness of the rear subframe, etc., in this embodiment, specifically, the rear floor middle cross member 301 is arranged between the two shock absorber mounting points 101, the "day" - shaped cross - section at the rear subframe mounting point part, the setting of the rear floor strengthening beam 5 and the formed "day" - shaped cross - section and other structures are used for improvement.

[0124] When a vehicle collision occurs, the rear impact force is transmitted forward through the rear floor longitudinal beam 1, and dispersed midway to the rear floor rear crossbeam 302 and the rear floor 202. The rear floor rear crossbeam 302 is then transmitted to the rear floor middle crossbeam 301 through the rear floor reinforcing beam 5. When the impact force is transmitted to the rear floor middle crossbeam 301, it can be further transmitted to the rear floor rear crossbeam 302 through the rear floor reinforcing beam 5. The force gradually disperses and disappears in this force transmission structure. During vehicle operation, the stress generated at the rear subframe mounting point and the rear shock absorber mounting point 101 is also transmitted through the aforementioned force transmission structure, with the stress being transmitted to the rear floor longitudinal beam through the crossbeams until it disperses and disappears.

[0125] The rear floor assembly of this embodiment improves the structure and arrangement of the crossbeam 301 in the rear floor, making the vehicle's front-to-rear space more compact. It is particularly suitable for A0-class small cars. It allows the rear floor panel 2 to be partially recessed to accommodate the spare tire compartment 2021 without taking up trunk space. This vehicle can be equipped with a torsion beam rear suspension, meeting the needs of some users with lower requirements for vehicle performance, or a multi-link rear suspension, reducing vehicle weight and improving vehicle handling performance. This allows for diversified vehicle configurations, better meeting the needs of different customers.

[0126] In addition, the addition of two diagonally supported rear floor reinforcement beams 5 helps to improve the structure of the rear floor assembly. At the same time, the modified structure forms multiple reinforcements, which can also improve the dynamic stiffness and strength of the mounting points of the rear subframe on the crossbeam 301 in the rear floor. This improves the user's driving experience, NVH (Noise, Vibration, Harshness), and operational stability, and enhances the vehicle's market competitiveness.

[0127] Example 2

[0128] This embodiment relates to a vehicle that has a rear floor assembly as described in Embodiment 1.

[0129] The vehicle of the present invention, by applying the rear floor assembly as in Embodiment 1, can make the vehicle's front-to-rear structure more compact. It can make the rear floor panel 2 partially recessed downward to arrange the spare tire receiving slot 2021 without occupying the space of the trunk. The vehicle can be equipped with either a torsion beam rear suspension or a multi-link rear suspension, which allows for diversified vehicle configurations and helps to better meet the needs of different customers.

[0130] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A rear floor assembly, characterized in that: It includes rear floor longitudinal beams (1) arranged on the left and right sides of the vehicle, a rear floor panel (2) connecting the rear floor longitudinal beams (1) on both sides, and a rear floor crossbeam (3) connecting the rear floor longitudinal beams (1) on both sides and connected to the lower side of the rear floor panel (2). The rear floor panel (2) is partially recessed downward to form a spare tire receiving groove (2021); The rear floor beam (3) includes a rear floor middle beam (301), and the front side of the rear floor middle beam (301) is connected to the rear floor panel (2); Along the left-right direction of the vehicle, the rear middle part of the rear floor crossbeam (301) is connected to the front sidewall (2022) of the spare tire receiving groove (2021), and the rear left and right parts of the rear floor crossbeam (301) are respectively connected to the rear floor panel (2), thus forming a crossbeam cavity extending along the left-right direction of the vehicle.

2. The rear floor assembly according to claim 1, characterized in that: The rear floor crossbeam (301) is provided with multiple rear subframe mounting parts, and the multiple rear subframe mounting parts are arranged at intervals along the left and right directions of the vehicle.

3. The rear floor assembly according to claim 2, characterized in that: The middle crossbeam cavity is provided with a rear subframe mounting reinforcement plate (4), and there are multiple rear subframe mounting reinforcement plates (4), each corresponding to a rear subframe mounting part.

4. The rear floor assembly according to claim 3, characterized in that: Along the vertical direction of the vehicle, each of the rear subframe mounting reinforcement plates (4) is located in the middle of the middle crossbeam cavity, and the middle crossbeam cavity is divided into a first middle crossbeam sub-cavity (3014) and a second middle crossbeam sub-cavity (3015) arranged vertically. Each of the aforementioned rear subframe mounting parts includes a rear subframe mounting hole (3016) provided on the rear floor crossbeam (301), and a rear subframe mounting sleeve (3017) located in the second crossbeam cavity (3015) and connected between the rear floor crossbeam (301) and the rear subframe mounting reinforcement plate (4).

5. The rear floor assembly according to any one of claims 2-4, characterized in that: The rear floor crossbeam (3) also includes a rear floor rear crossbeam (302), and a rear floor reinforcing beam (5) is connected between the rear floor rear crossbeam (302) and the rear floor middle crossbeam (301). The rear floor reinforcing beam (5) is connected to the lower side of the bottom wall (2023) of the spare tire receiving groove (2021).

6. The rear floor assembly according to claim 5, characterized in that: There are multiple rear floor reinforcement beams (5), and the multiple rear floor reinforcement beams (5) are arranged at intervals along the left and right directions of the vehicle.

7. The rear floor assembly according to claim 6, characterized in that: There are two rear floor reinforcement beams (5), and each of the rear floor reinforcement beams (5) gradually tilts outward from the rear to the front along the front-rear direction of the vehicle.

8. The rear floor assembly according to claim 7, characterized in that: The connection point of the rear floor reinforcing beam (5) and the rear floor crossbeam (301) is located near the rear subframe mounting section.

9. The rear floor assembly according to claim 6, characterized in that: A reinforcing beam cavity is formed between the rear floor reinforcing beam (5) and the bottom wall (2023) of the spare tire receiving groove (2021), and the extension direction of the reinforcing beam cavity is set with the extension direction of the rear floor reinforcing beam (5).

10. A vehicle, characterized in that: The vehicle is equipped with a rear floor assembly as described in any one of claims 1-9.

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