Rear vehicle body floor structure and vehicle thereof

Abstract

The rear vehicle body floor structure comprises a front floor structure, a rear floor structure and a reinforcing beam, and the rear floor structure is connected with the front floor structure; the reinforcing beam comprises a middle longitudinal beam and a side flat-lying beam, the middle longitudinal beam is connected between the front floor structure and the rear floor structure, and the side flat-lying beam is arranged on the front floor structure and located on one side of the middle longitudinal beam; the distance between the horizontal plane of the top end of the rear floor structure and the horizontal plane of the bottom end is a first distance, and the distance between the horizontal plane of the top end of the middle longitudinal beam and the horizontal plane of the bottom end is a second distance. The first distance is larger than or equal to a first set threshold value, the ratio of the second distance to the third distance is larger than a second set threshold value, and the second set threshold value is larger than 1. The rear floor structure with a certain height is designed, the reinforcing beam is arranged between the front floor structure and the rear floor structure, and the rigidity of the rear vehicle body floor structure is improved.

Description

Technical Field

[0001] The present application relates to the field of vehicle body floors, and in particular to a rear vehicle body floor structure and a vehicle thereof. Background Art

[0002] For three-row MPVs or large SUVs with extended-range new energy vehicles, the rear floor's larger wheelbase results in weaker rigidity, leading to frequent vibration in the rear second row of seats during driving. The second-row seat floor is affected by the cabin's height, and due to the placement of components such as the battery pack, fuel tank, and wiring harness at the bottom, it's difficult to raise the overall floor height. Therefore, the design of the beam joints and panels in this area are crucial for ensuring NVH performance. Furthermore, the interior space of new energy extended-range vehicles is difficult to raise, and the lower floor, which houses the battery pack, fuel tank, and wiring harness, is limited, making it difficult to design staggered panel-beam joints to improve rigidity. The larger wheelbase of three-row MPVs or large SUVs results in insufficient rigidity in the second-row seat floor, leading to significant seat vibration. Summary of the Invention

[0003] The present application provides a rear vehicle body floor structure and a vehicle thereof, which can solve the problem of insufficient floor position rigidity in three-row MPVs or large SUV new energy extended-range models in the related art, which in turn leads to large seat vibration.

[0004] In a first aspect, an embodiment of the present application provides a rear vehicle body floor structure, comprising: a front floor structure, a rear floor structure and a reinforcing beam, wherein the rear floor structure is connected to the front floor structure; the reinforcing beam comprises a middle longitudinal beam and a side flat beam, wherein the middle longitudinal beam is connected between the front floor structure and the rear floor structure, and the side flat beam is arranged on the front floor structure and is located on one side of the middle longitudinal beam; wherein the distance between the horizontal plane at the top end and the horizontal plane at the bottom end of the rear floor structure is a first distance, the distance between the horizontal plane at the top end and the horizontal plane at the bottom end of the middle longitudinal beam is a second distance, and the distance between the horizontal plane at the top end and the horizontal plane at the bottom end of the side flat beam is a third distance; the first distance is greater than or equal to a first set threshold, the ratio of the second distance to the third distance is greater than the second set threshold, and the second set threshold is greater than 1.

[0005] In combination with the first aspect, in one embodiment, the middle longitudinal beam includes: a first middle longitudinal beam and a second middle longitudinal beam, wherein one end of the first middle longitudinal beam is connected to the front floor structure and the other end is connected to the rear floor structure; one end of the second middle longitudinal beam is connected to the front floor structure and the other end is connected to the rear floor structure.

[0006] In combination with the first aspect, in one embodiment, the first middle longitudinal beam includes the right rear longitudinal beam of the rear section of the front floor and the right connecting plate of the front cross beam of the rear floor. The right rear longitudinal beam of the rear section of the front floor is disposed on the front floor structure, and the right connecting plate of the front cross beam of the rear floor is disposed on the rear floor structure. The right rear longitudinal beam of the rear section of the front floor and the right connecting plate of the front cross beam of the rear floor are connected by fasteners; The second middle longitudinal beam includes the left rear longitudinal beam of the rear section of the front floor and the left connecting plate of the front cross beam of the rear floor. The left rear longitudinal beam of the rear section of the front floor is disposed on the front floor structure, and the left connecting plate of the front cross beam of the rear floor is disposed on the rear floor structure. The left rear longitudinal beam of the rear section of the front floor and the left connecting plate of the front cross beam of the rear floor are connected by fasteners.

[0007] In combination with the first aspect, in one embodiment, the side flat-lying beam includes: the right outer longitudinal beam of the rear section of the front floor and the left outer longitudinal beam of the rear section of the front floor. The right outer longitudinal beam of the rear section of the front floor is connected to the front floor structure; the left outer longitudinal beam of the rear section of the front floor is connected to the front floor structure and is symmetrically disposed on both sides of the middle longitudinal beam with the right outer longitudinal beam of the rear section of the front floor.

[0008] In combination with the first aspect, in one embodiment, the first middle longitudinal beam and the second middle longitudinal beam are symmetrically disposed on both sides of the central axis of the front floor structure; The first middle longitudinal beam and the right outer longitudinal beam of the rear section of the front floor are on the same side of the central axis of the front floor structure, and the ratio of the distance between the middle of the first middle longitudinal beam and the central axis of the front floor structure to the distance between the right outer longitudinal beam of the rear section of the front floor and the central axis of the front floor structure is greater than a fourth set threshold.

[0009] In combination with the first aspect, in one embodiment, the front floor structure includes: the right rear section of the front floor, the connecting plate of the rear channel of the front floor, the connecting plate of the rear part of the front floor, and the left rear section of the front floor. The connecting plate of the rear channel of the front floor is connected to the right rear section of the front floor; the connecting plate of the rear part of the front floor is connected to the connecting plate of the rear channel of the front floor; the left rear section of the front floor is connected to the connecting plate of the rear part of the front floor.

[0010] In combination with the first aspect, in one embodiment, the rear floor structure includes: the rear floor body, the rear cross beam structure, and the front cross beam structure. The rear cross beam structure is disposed on the rear floor body; the front cross beam structure is disposed on the rear floor body, and the front cross beam structure is connected to the strengthening beam.

[0011] In combination with the first aspect, in one embodiment, fuel tank brackets are disposed on both the rear cross beam structure and the middle longitudinal beam.

[0012] In combination with the first aspect, in one embodiment, the second set threshold is greater than or equal to 3; the ratio of the length of the middle longitudinal beam to the length of the side flat-lying beam is greater than a third set threshold, and the third set threshold is greater than or equal to 2.

[0013] In a second aspect, an embodiment of the present application provides a vehicle, which includes: the rear body floor structure and the mounting structure as described above, and the mounting structure is disposed at the bottom end of the rear body floor structure.

[0014] The beneficial effects brought by the technical solutions provided by the embodiments of the present application include: An embodiment of the present application provides a rear body floor structure and a vehicle thereof. To ensure the stiffness of the rear part of the rear body floor structure, a rear floor structure with a certain height is designed; and a reinforcing beam is disposed between the front floor structure and the rear floor structure to improve the stiffness of the rear body floor structure: for the area with relatively weak stiffness in the middle of the rear body floor structure, a middle longitudinal beam is added to ensure the stiffness of the rear body floor structure and ensure that the height of the middle longitudinal beam meets the design value. To increase the stiffness of both sides of the rear body floor structure, under the condition of limited space, a side flat beam is added to improve the stiffness of the front floor structure. Therefore, the stiffness of the rear body floor structure can meet the requirements of vehicle body vibration and ensure the comfort of the second-row seats. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0016] Figure 1 Schematic diagram of the rear body floor structure provided by an embodiment of the present application; Figure 2 Schematic diagram of the front floor structure and the rear floor structure provided by an embodiment of the present application; Figure 3 Schematic diagram of the overall structure provided by an embodiment of the present application; Figure 4 Schematic diagram of the overall structure provided by an embodiment of the present application.

[0017] In the figure: 1, front floor structure; 10, right rear section of the front floor; 11, connecting plate of the rear channel of the front floor; 12, left rear section of the front floor; 13, connecting plate at the rear of the front floor; 2, reinforcing beam; 20, first middle longitudinal beam; 200, right rear longitudinal beam of the rear section of the front floor; 201, right connecting plate of the front cross beam of the rear floor; 21, second middle longitudinal beam; 210, left rear longitudinal beam of the rear section of the front floor; 211, left connecting plate of the front cross beam of the rear floor; 22, right outer longitudinal beam of the rear section of the front floor; 23, left outer longitudinal beam of the rear section of the front floor; 24, fastener; 3. Rear floor structure; 30. Right connecting plate of lower plate; 31. Left connecting plate of lower plate; 32. Lower plate of front cross beam of rear floor; 33. Rear floor body; 34. Right connecting part of rear cross beam of rear floor; 35. Left connecting part of rear cross beam of rear floor; 36. Rear cross beam body of rear floor; 4. Fuel tank bracket; 5. Mounting structure; 50. Charging harness; 51. Body harness; 52. Carbon canister pipeline; 53. High-voltage harness of rear motor; 54. High-voltage harness of charger; 55. Battery pack; 56. Exhaust pipeline; 57. Fuel tank; 58. Carbon canister body. Specific embodiments

[0018] In order to enable those skilled in the art to better understand the solution of this application, the technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of this application. Obviously, the described embodiments are only a part of the embodiments of this application, rather than all the embodiments. Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of this application.

[0019] See Figures 1 to 4 , the embodiment of this application provides a rear body floor structure and a vehicle thereof, which can solve the problem that the stiffness of the floor position in a three-row MPV or large SUV new energy extended-range vehicle in the related art is insufficient, resulting in relatively large seat vibration.

[0020] In the first aspect, the embodiment of this application provides a rear body floor structure, which includes: a front floor structure 1, a rear floor structure 3, and a reinforcing beam 2. The rear floor structure 3 is connected to the front floor structure 1; the reinforcing beam 2 includes a middle longitudinal beam and a side horizontal beam. The middle longitudinal beam is connected between the front floor structure 1 and the rear floor structure 3, and the side horizontal beam is arranged on the front floor structure 1 and is located on one side of the middle longitudinal beam; wherein, the distance between the horizontal plane where the top end of the rear floor structure 3 is located and the horizontal plane where the bottom end is located is the first distance, the distance between the horizontal plane where the top end of the middle longitudinal beam is located and the horizontal plane where the bottom end is located is the second distance, and the distance between the horizontal plane where the top end of the side horizontal beam is located and the horizontal plane where the bottom end is located is the third distance. The first distance is greater than or equal to the first set threshold, the ratio of the second distance to the third distance is greater than the second set threshold, and the second set threshold is greater than 1.

[0021] In this application, Figure 1The X shown in the figure marks the boundary between the front floor structure 1 and the rear floor structure 3. To ensure the rear stiffness of the rear floor structure, a rear floor structure 3 of a certain height is designed. A reinforcement beam 2 is installed between the front and rear floor structures 1 and 3 to increase the stiffness of the rear floor structure. In the weaker central area of the rear floor structure, a central longitudinal beam is added to ensure stiffness, and the height of the central longitudinal beam meets the design value. To increase stiffness on both sides of the rear floor structure, side horizontal beams are added to increase the stiffness of the front floor structure 1, even in limited space. As a result, the stiffness of the rear floor structure meets the vibration requirements of the vehicle body and ensures comfortable seating in the second row.

[0022] In this embodiment, the first threshold is set to 20mm. It should be noted that the first distance refers to the maximum height of the rear floor structure 3 cross section; the second distance refers to the maximum height of the center longitudinal beam cross section; and the third distance refers to the maximum height of the side flat beam cross section. In this embodiment, the maximum height of the center longitudinal beam cross section is greater than the maximum height of the side flat beam cross section. The reasons for this design will be explained in detail below.

[0023] To ensure the rear rigidity of the rear floor, the design of this structure begins with a rear floor structure 3 of a specific cross-sectional height. This structure is composed of multiple distinct components, including a rear floor body 33, a rear cross member, and a front cross member. To accommodate the vehicle's internal structure, the heights of the rear floor body 33, the rear cross member, and the front cross member are also designed to differ.

[0024] Specifically, the rear cross-beam structure is mounted on the rear floor body 33; the front cross-beam structure is mounted on the rear floor body 33 and connected to the reinforcement beam 2. In this embodiment, a front cross-beam structure with a certain cross-sectional height is first designed. In this embodiment, the first distance refers to the maximum height of the front cross-beam structure's cross-section. This is because the front cross-beam structure is the fundamental support component of the rear floor structure and directly affects its stiffness, safety, and spatial layout efficiency. The front cross-beam structure is the key transverse framework of the rear floor structure. Through its cross-sectional height and rigidity design, it provides foundational support for the trunk, seat brackets, chassis components, and other components, ensuring the stability of the rear floor structure under load. Under collision or dynamic loads, the front cross-beam structure serves as the connecting link between the front floor structure 1, rear floor structure 3, and reinforcement beam 2. Its cross-sectional parameters must be prioritized to optimize the load transfer path and reduce stress concentration. Furthermore, the cross-sectional height design of the front cross-beam structure must balance the layout requirements of the mounting structure 5 and collision safety requirements. Prioritizing this design can avoid subsequent spatial conflicts.

[0025] Further, in this embodiment, the front crossbeam structure is connected to one side of the top end of the rear floor body 33 close to the front floor structure 1. The front crossbeam structure includes a lower front crossbeam plate 32 of the rear floor, a right connecting plate 30 of the lower plate, and a left connecting plate 31 of the lower plate. The right connecting plate 30 of the lower plate and the left connecting plate 31 of the lower plate are respectively connected to both sides of the lower front crossbeam plate 32 of the rear floor. The rear crossbeam structure is connected to one side of the top end of the rear floor body 33 away from the front floor structure 1. The rear crossbeam structure includes a right connecting member 34 of the rear crossbeam of the rear floor, a left connecting member 35 of the rear crossbeam of the rear floor, and a rear crossbeam body 36 of the rear floor. The right connecting member 34 of the rear crossbeam of the rear floor and the left connecting member 35 of the rear crossbeam of the rear floor are respectively arranged on both sides of the rear crossbeam body 36 of the rear floor.

[0026] Based on the above embodiment, in this embodiment, the front floor structure 1 includes: a right rear section 10 of the front floor, a connecting plate 11 of the rear channel of the front floor, a rear connecting plate 13 of the front floor, and a left rear section 12 of the front floor. The connecting plate 11 of the rear channel of the front floor is connected to the right rear section 10 of the front floor; the rear connecting plate 13 of the front floor is connected to the connecting plate 11 of the rear channel of the front floor; the left rear section 12 of the front floor is connected to the rear connecting plate 13 of the front floor. That is to say, the right rear section 10 of the front floor and the left rear section 12 of the front floor are respectively connected to both sides of the connecting plate 11 of the rear channel of the front floor, and the right rear section 10 of the front floor, the connecting plate 11 of the rear channel of the front floor, and the left rear section 12 of the front floor are all connected to the rear connecting plate 13 of the front floor.

[0027] In actual manufacturing, the front floor structure 1 and the rear floor structure 3 are separated at the rear connecting plate 13 of the front floor and the front crossbeam structure, and the front floor structure 1 and the rear floor structure 3 are welded together by dropping the rear connecting plate 13 of the front floor onto the front crossbeam structure. If the middle reinforcing beam 2 is directly welded to the lower front crossbeam plate 32 of the rear floor, the cantilever will be too long, and only the floor lap edge is welded. The reinforcing beam 2 is prone to deformation during transportation, affecting the manufacturing accuracy. Therefore, there is also a design difficulty in how to design the reinforcing beam 2 to meet the process requirements.

[0028] Therefore, in this embodiment, the middle longitudinal beam is divided into a front half and a rear half. The front half is welded to the connecting plate 11 of the rear channel of the front floor; the rear half is welded to the lower front crossbeam plate 32 of the rear floor. After the front floor structure 1 and the rear floor structure 3 are dropped and completed during manufacturing, the edge of the rear half is welded to the rear connecting plate 13 of the front floor, and the front half and the middle of the rear half are assembled and connected by fasteners 24, that is, bolts, to complete the assembly connection of the front half and the rear half of the middle longitudinal beam.

[0029] Specifically, the middle longitudinal beam includes: a first middle longitudinal beam 20 and a second middle longitudinal beam 21. One end of the first middle longitudinal beam 20 is connected to the front floor structure 1, and the other end is connected to the rear floor structure 3; one end of the second middle longitudinal beam 21 is connected to the front floor structure 1, and the other end is connected to the rear floor structure 3.

[0030] Since the middle longitudinal beam is separated into a front half and a rear half, in this embodiment, the first middle longitudinal beam 20 is provided to include the right rear longitudinal beam 200 of the rear section of the front floor and the right connecting plate 201 of the front cross beam of the rear floor. The right rear longitudinal beam 200 of the rear section of the front floor is disposed on the front floor structure 1, and the right connecting plate 201 of the front cross beam of the rear floor is disposed on the rear floor structure 3. The right rear longitudinal beam 200 of the rear section of the front floor and the right connecting plate 201 of the front cross beam of the rear floor are connected by fasteners 24. Among them, the right rear longitudinal beam 200 of the rear section of the front floor is welded to the rear connecting plate 13 of the front floor, and the right connecting plate 201 of the front cross beam of the rear floor is welded to the lower plate 32 of the front cross beam of the rear floor.

[0031] The second middle longitudinal beam 21 is provided to include the left rear longitudinal beam 210 of the rear section of the front floor and the left connecting plate 211 of the front cross beam of the rear floor. The left rear longitudinal beam 210 of the rear section of the front floor is disposed on the front floor structure 1, and the left connecting plate 211 of the front cross beam of the rear floor is disposed on the rear floor structure 3. The left rear longitudinal beam 210 of the rear section of the front floor and the left connecting plate 211 of the front cross beam of the rear floor are connected by fasteners 24. Among them, the left rear longitudinal beam 210 of the rear section of the front floor is welded to the rear connecting plate 13 of the front floor, and the left connecting plate 211 of the front cross beam of the rear floor is welded to the lower plate 32 of the front cross beam of the rear floor.

[0032] This application mainly reduces the floor vibration based on the method of improving the mode. The mode calculation formula is as follows:

[0033] Among them, f is the modal frequency, k is the stiffness, and m is the mass; The modal frequency is directly proportional to the square root of the stiffness and inversely proportional to the square root of the mass. In the optimization of the rear body floor structure, the increase in mass (m) is usually limited by the lightweight requirement, and its influence on the frequency is relatively small; in contrast, the increase in stiffness (k) is more direct and effective, which can significantly increase the modal frequency, make the structure away from the resonance region, reduce the vibration transmission and amplification. Therefore, the main method to improve the floor mode is to increase the floor stiffness. In this application, the stiffness of the rear body floor structure is mainly increased by providing the strengthening beam 2, the rear cross beam structure and the front cross beam structure.

[0034] In this embodiment, the maximum height of the cross section of the middle longitudinal beam is greater than the maximum height of the cross section of the side flat-lying beam: for the region with relatively weak middle stiffness, the cavity of the middle longitudinal beam is increased to ensure the stiffness of the rear body floor structure. Due to the occupation of the carbon canister space on both sides of the rear body floor structure, smaller side flat-lying beams are used on both sides. In the case of limited space, the side flat-lying beams are increased to improve the stiffness of the rear floor.

[0035] Among them, the side flat-lying beams include: the right outer longitudinal beam 22 of the rear section of the front floor and the left outer longitudinal beam 23 of the rear section of the front floor. The right outer longitudinal beam 22 of the rear section of the front floor is connected to the front floor structure 1; the left outer longitudinal beam 23 of the rear section of the front floor is connected to the front floor structure 1 and is symmetrically arranged with the right outer longitudinal beam 22 of the rear section of the front floor on both sides of the middle longitudinal beam.

[0036] Furthermore, the second set threshold is set to be greater than or equal to 3. In this embodiment, the second set threshold is set to 3, and the ratio of the second distance to the third distance is equal to 3, that is, the distance between the horizontal plane at the top of the middle longitudinal beam and the horizontal plane at the bottom is three times the distance between the horizontal plane at the top of the side flat-lying beam and the horizontal plane at the bottom. Under the carbon canister space limitation, by using the side flat-lying beam with a smaller cross-section to replace the traditional longitudinal beam, it can not only meet the stiffness requirements but also avoid excessive occupation of the chassis space.

[0037] And the ratio of the length of the middle longitudinal beam to the length of the side flat-lying beam is set to be greater than the third set threshold, and the third set threshold is greater than or equal to 2. In this embodiment, the third set threshold is set to 2, that is, the length of the middle longitudinal beam is twice the length of the side flat-lying beam.

[0038] Based on the above embodiments, in this embodiment, the first middle longitudinal beam 20 and the second middle longitudinal beam 21 are symmetrically arranged on both sides of the central axis of the front floor structure 1; the first middle longitudinal beam 20 and the right outer longitudinal beam 22 of the rear section of the front floor are located on the same side of the central axis of the front floor structure 1. By symmetrically distributing the first middle longitudinal beam 20 and the second middle longitudinal beam 21 on both sides of the central axis, a symmetric load transfer path is formed, reducing the risk of vehicle body torsion and deflection and improving the dynamic driving stability.

[0039] The ratio of the distance between the middle of the first middle longitudinal beam 20 and the central axis of the front floor structure 1 to the distance between the right outer longitudinal beam 22 of the rear section of the front floor and the central axis of the front floor structure 1 is greater than the fourth set threshold. By adjusting the distance ratio between the middle longitudinal beam, the side flat-lying beam and the central axis, a more efficient longitudinal load transfer path is formed to ensure that the collision energy can be quickly dispersed to the vehicle body frame and reduce the risk of local deformation. Among them, the fourth set threshold is set to be greater than or equal to 3. In this embodiment, the fourth set threshold is set to 3, that is, the distance between the middle of the first middle longitudinal beam 20 and the central axis of the front floor structure 1 is three times the distance between the right outer longitudinal beam 22 of the rear section of the front floor and the central axis of the front floor structure 1.

[0040] Based on the above embodiments, in this embodiment, fuel tank brackets 4 are provided on both the rear crossbeam structure and the middle longitudinal beam. Specifically, fuel tank brackets 4 are designed on the right connecting plate 201 of the front rear floor crossbeam, the left connecting plate 211 of the front rear floor crossbeam, the left connecting member 35 of the rear rear floor crossbeam, and the rear rear floor crossbeam body 36. Since the stiffness of the rear crossbeam structure and the middle longitudinal beam is relatively large, the installation stiffness of a large-capacity fuel tank can be ensured.

[0041] In summary, the rear body floor structure designed in this application can ensure stiffness to reduce vehicle interior vibration, guarantee the comfort of the second-row seats, solve the problem of part dropping in the manufacturing process, and meet the manufacturing requirements; this rear body floor structure is also applicable to both steel and aluminum materials of the body of new energy vehicle models; at the same time, the cross-section of the front crossbeam structure is relatively large, and it can form a strong overall support with the thick middle longitudinal beam in the middle, which can improve the floor stiffness and reduce the vibration of the rear body floor structure.

[0042] In a second aspect, an embodiment of the present application provides a vehicle, which includes the rear body floor structure provided in any one of the above embodiments of the present application and an installation structure 5, and the installation structure 5 is arranged at the bottom end of the rear body floor structure.

[0043] In this application, in order to ensure the stiffness of the rear part of the rear body floor structure, a rear floor structure 3 with a certain height is designed; a strengthening beam 2 is arranged between the front floor structure 1 and the rear floor structure 3 to improve the stiffness of the rear body floor structure: for the area with relatively weak stiffness in the middle of the rear body floor structure, a middle longitudinal beam is added to ensure the stiffness of the rear body floor structure and ensure that the height of the middle longitudinal beam meets the design value. In order to increase the stiffness of both sides of the rear body floor structure, under the condition of limited space, a side flat-lying beam is added to improve the stiffness of the front floor structure 1. Therefore, the stiffness of the rear body floor structure can meet the vehicle body vibration requirements and guarantee the comfort of the second-row seats.

[0044] In this application, the installation structure 5 includes a charging harness 50, a body harness 51, a carbon canister pipeline 52, a rear motor high-voltage harness 53, a charger high-voltage harness 54, a battery pack 55, an exhaust pipeline 56, a fuel tank 57, and a carbon canister body 58. The middle longitudinal beam improves the bending and torsional stiffness through an enlarged cavity design. At the same time, a side flat-lying beam with a smaller cross-section is transversely connected in the area occupied by the carbon canister body 58 and the exhaust pipeline 56, which not only supplements the local stiffness but also avoids space conflicts.

[0045] In the description of this application, it should be noted that the orientation or positional relationship indicated by terms such as "upper" and "lower" is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing this application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to this application. Unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific situations.

[0046] It should be noted that in this application, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements not only includes those elements, but also includes other elements not expressly listed, or also includes elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "comprising an..." does not exclude the presence of additional identical elements in the process, method, article or device comprising the said element.

[0047] The above are only specific embodiments of this application, enabling those skilled in the art to understand or implement this application. Various modifications to these embodiments will be obvious to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application will not be limited to these embodiments shown herein, but rather to the broadest scope consistent with the principles and novel features claimed herein.

Claims

1. A rear body floor structure, characterized in that, It includes: A front floor structure (1); A rear floor structure (3), the rear floor structure (3) being connected to the front floor structure (1); A reinforcing beam (2), the reinforcing beam (2) including a middle longitudinal beam and a side flat-lying beam, the middle longitudinal beam being connected between the front floor structure (1) and the rear floor structure (3), and the side flat-lying beam being disposed on the front floor structure (1) and on one side of the middle longitudinal beam; Wherein, the distance between the horizontal plane at the top end and the horizontal plane at the bottom end of the rear floor structure (3) is a first distance, the distance between the horizontal plane at the top end and the horizontal plane at the bottom end of the middle longitudinal beam is a second distance, and the distance between the horizontal plane at the top end and the horizontal plane at the bottom end of the side flat-lying beam is a third distance; The first distance is greater than or equal to a first set threshold, the ratio of the second distance to the third distance is greater than a second set threshold, and the second set threshold is greater than 1.

2. The rear body floor structure according to claim 1, characterized in that, The middle longitudinal beam includes: A first middle longitudinal beam (20), one end of the first middle longitudinal beam (20) being connected to the front floor structure (1) and the other end being connected to the rear floor structure (3); A second middle longitudinal beam (21), one end of the second middle longitudinal beam (21) being connected to the front floor structure (1) and the other end being connected to the rear floor structure (3).

3. The rear body floor structure according to claim 2, wherein: The first middle longitudinal beam (20) includes a right rear longitudinal beam of the rear section of the front floor (200) and a right connecting plate of the front cross beam of the rear floor (201), the right rear longitudinal beam of the rear section of the front floor (200) being disposed on the front floor structure (1), the right connecting plate of the front cross beam of the rear floor (201) being disposed on the rear floor structure (3), and the right rear longitudinal beam of the rear section of the front floor (200) and the right connecting plate of the front cross beam of the rear floor (201) being connected by a fastener (24); The second middle longitudinal beam (21) includes a left rear longitudinal beam of the rear section of the front floor (210) and a left connecting plate of the front cross beam of the rear floor (211), the left rear longitudinal beam of the rear section of the front floor (210) being disposed on the front floor structure (1), the left connecting plate of the front cross beam of the rear floor (211) being disposed on the rear floor structure (3), and the left rear longitudinal beam of the rear section of the front floor (210) and the left connecting plate of the front cross beam of the rear floor (211) being connected by a fastener (24).

4. The rear body floor structure according to claim 2, characterized in that, The side flat-lying beam includes: A right outer longitudinal beam of the rear section of the front floor (22), the right outer longitudinal beam of the rear section of the front floor (22) being connected to the front floor structure (1); A left outer longitudinal beam of the rear section of the front floor (23), the left outer longitudinal beam of the rear section of the front floor (23) being connected to the front floor structure (1) and being symmetrically disposed with the right outer longitudinal beam of the rear section of the front floor (22) on both sides of the middle longitudinal beam.

5. The rear body floor structure according to claim 4, wherein: The first middle longitudinal beam (20) and the second middle longitudinal beam (21) are symmetrically disposed on both sides of the central axis of the front floor structure (1); The first middle longitudinal beam (20) and the right outer longitudinal beam at the rear section of the front floor (22) are on the same side of the central axis of the front floor structure (1), and the ratio of the distance between the middle of the first middle longitudinal beam (20) and the central axis of the front floor structure (1) to the distance between the right outer longitudinal beam at the rear section of the front floor (22) and the central axis of the front floor structure (1) is greater than a fourth set threshold value.

6. The rear body floor structure according to claim 1, characterized in that, The front floor structure (1) includes: The right rear section of the front floor (10); The front floor rear channel connecting plate (11), and the front floor rear channel connecting plate (11) is connected to the right rear section of the front floor (10); The rear connecting plate of the front floor (13), and the rear connecting plate of the front floor (13) is connected to the front floor rear channel connecting plate (11); The left rear section of the front floor (12), and the left rear section of the front floor (12) is connected to the rear connecting plate of the front floor (13).

7. The rear body floor structure according to claim 1, wherein, The rear floor structure (3) includes: The rear floor body (33); The rear crossbeam structure, and the rear crossbeam structure is arranged on the rear floor body (33); The front crossbeam structure, and the front crossbeam structure is arranged on the rear floor body (33), and the front crossbeam structure is connected to the strengthening beam (2).

8. The rear body floor structure according to claim 7, wherein: Fuel tank brackets (4) are arranged on both the rear crossbeam structure and the middle longitudinal beam.

9. The rear body floor structure according to claim 1, wherein: The second set threshold value is greater than or equal to 3; The ratio of the length of the middle longitudinal beam to the length of the side flat-lying beam is greater than a third set threshold value, and the third set threshold value is greater than or equal to 2.

10. A vehicle, characterized in that, It includes: The rear body floor structure according to any one of claims 1-9; The mounting structure (5), and the mounting structure (5) is arranged at the bottom end of the rear body floor structure.

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