Vehicle body middle structure and vehicle

Abstract

The utility model provides a vehicle body middle structure and a vehicle. The vehicle body middle structure comprises a doorsill beam, a seat cross beam and a reinforcing beam, wherein the end of the seat cross beam is connected with the doorsill beam, and the reinforcing beam is connected between the seat cross beam and the doorsill beam. The reinforcing beam is arranged close to the end part of the seat cross beam and is obliquely arranged relative to the seat cross beam, and the threshold beam, the seat cross beam and the reinforcing beam are connected to form a triangular structure. According to the middle structure of the vehicle body, the reinforcing beam is arranged, the doorsill beam, the seat cross beam and the reinforcing beam form a triangular structure, the number of connecting points between the doorsill beam and the seat cross beam is increased, and the rigidity of the vehicle body can be improved. And meanwhile, by forming the triangular structure, when the side collision of the whole vehicle occurs, the collision acting force can be fully transmitted to the seat cross beam, the transmission and dispersion of the collision acting force are realized, and the collision safety of the whole vehicle is favorably improved.

Description

Technical Field

[0001] The utility model relates to the technical field of vehicle body structures, and particularly relates to a middle vehicle body structure. The utility model also relates to a vehicle provided with the above middle vehicle body structure. Background Art

[0002] With the rapid development of the automotive industry and the continuous improvement of consumers' requirements for vehicle safety performance, the design of vehicle body structures has become particularly important. As the core load-bearing area of a vehicle, the structure design of the middle vehicle body is directly related to the overall rigidity and collision safety of the vehicle. Especially in side collision accidents, the strength of the middle vehicle body structure is directly related to the survival space and safety of passengers.

[0003] In the prior art, the front floor seat crossbeam in the middle of the vehicle body is connected to the sill beam on the side of the vehicle body through the flange at the end of the seat crossbeam, or is connected through a connecting bracket. However, only the end of the seat crossbeam forms a connection with the sill beam, and there are few connection points, which easily form weak points in the connection between the seat crossbeam and the vehicle body, and will limit the improvement of the vehicle body stiffness. At the same time, it is also easy to affect the full transmission of collision force between the sill beam and the seat crossbeam during a vehicle side collision, which may lead to tearing between the sill beam and the seat crossbeam, and the sill beam intruding into the passenger compartment and causing harm to the occupants, which is not conducive to the improvement of the overall vehicle collision safety. Summary of the Utility Model

[0004] In view of this, the utility model aims to provide a middle vehicle body structure, which is beneficial to improving the vehicle body stiffness and enhancing the collision safety of the whole vehicle.

[0005] To achieve the above object, the technical solution of the utility model is realized as follows:

[0006] A middle vehicle body structure includes a sill beam, a seat crossbeam with an end connected to the sill beam, and a reinforcing beam connected between the seat crossbeam and the sill beam; the reinforcing beam is arranged near the end of the seat crossbeam, is inclined relative to the seat crossbeam, and a triangular structure is formed by the connection between the sill beam, the seat crossbeam and the reinforcing beam.

[0007] Furthermore, the reinforcing beam is located in front of the seat crossbeam, and the reinforcing beam is inclined towards the front side of the vehicle relative to the seat crossbeam.

[0008] Furthermore, the distance L between the connection position between the seat crossbeam and the sill beam and the connection position between the reinforcing beam and the sill beam satisfies L≥120mm.

[0009] Further, the reinforcing beam is lap-connected to the top and the side of the sill beam, and the reinforcing beam is lap-connected to the top and the side of the seat cross beam; and / or, the bottom of the reinforcing beam is connected to the front floor panel, and a cavity is formed between the reinforcing beam and the front floor panel, and both ends of the cavity are blocked by the sill beam and the seat cross beam respectively.

[0010] Further, the end of the seat cross beam is directly connected to the sill beam, and the seat cross beam is lap-connected to the top and the side of the sill beam; or, a connecting bracket is provided at the end of the seat cross beam, the connecting bracket is connected to the sill beam, the reinforcing beam is connected to the connecting bracket, and the connecting bracket is lap-connected to the top and the side of the sill beam.

[0011] Further, the sill beam includes an inner beam body and an outer beam body connected together in the left-right direction of the whole vehicle; both the inner beam body and the outer beam body extend in the front-rear direction of the whole vehicle, the inner beam body is made of steel sheet metal, and the cross section of the outer beam body is arranged as a multi-cavity energy-absorbing structure, and a sill beam cavity is formed between the inner beam body and the outer beam body.

[0012] Further, a support structure is provided on the outer beam body and located in the sill beam cavity; in the left-right direction of the whole vehicle, one side of the support structure is connected to the outer beam body, the other side of the support structure extends towards the inner beam body, and a gap is left between the support structure and the inner beam body.

[0013] Further, a side step mounting skeleton is provided on the outer beam body, the side step mounting skeleton extends in the front-rear direction of the whole vehicle, and in the left-right direction of the whole vehicle, one side of the side step mounting skeleton is connected to the outer beam body, and the other side of the side step mounting skeleton extends in the direction pointing outside the vehicle.

[0014] Further, both the outer beam body and the side step mounting skeleton are made of extruded profiles, and the side step mounting skeleton is integrally formed with the outer beam body, or the side step mounting skeleton is connected to the outer beam body through a connecting structure.

[0015] Compared with the prior art, the utility model has the following advantages:

[0016] The middle body structure of the present utility model forms a triangular structure among the sill beam, the seat cross beam and the reinforcing beam by arranging the reinforcing beam, increasing the connection points between the sill beam and the seat cross beam, which is beneficial to improving the body stiffness. At the same time, by forming a triangular structure, when a side collision occurs to the whole vehicle, the collision force can be fully transmitted to the seat cross beam, realizing the transmission and dispersion of the collision force, thereby being beneficial to improving the collision safety of the whole vehicle.

[0017] In addition, the reinforcing beam is located at the front side of the seat cross beam and is arranged obliquely towards the side front of the vehicle, which can better increase the stiffness of the occupant position in the body and contribute to improving the safety of the occupants during a side collision. At the same time, by controlling the distance between the two connection positions of the reinforcing beam with the seat cross beam and the sill beam, the strengthening range of the reinforcing beam on the side of the body can be increased, and the strengthening effect of the reinforcing beam on the body structure can be improved.

[0018] Furthermore, the reinforcing beam is lap-connected with the sill beam and the seat cross beam respectively, having a good connection effect and being able to ensure the reliability of the connection between the reinforcing beam and the sill beam as well as the seat cross beam. By enclosing and forming a cavity with the front floor panel by the reinforcing beam, the characteristic of large structural strength of the cavity structure can be utilized to increase the stiffness of the reinforcing beam, which is beneficial to providing the strengthening effect of the reinforcing beam. The seat cross beam is directly connected to the sill beam or connected through a connecting bracket, which can meet the setting requirements of different seat cross beams. At the same time, the seat cross beam or the connecting bracket is connected to the top and side of the sill beam, which can also ensure the connection strength and reliability between the seat cross beam and the sill beam.

[0019] Moreover, a sill beam cavity is formed by enclosing between the inner beam body and the outer beam body, and the overall structural strength of the sill beam can be improved by using the sill beam cavity. The cross section of the outer beam body is set as a multi-cavity energy-absorbing structure, and the characteristic that the multi-cavity energy-absorbing structure can fully perform crash energy absorption during a side collision of the whole vehicle can be utilized to improve the energy absorption effect during a side collision of the body. A support structure is arranged on the outer beam body inside the sill beam cavity, and the outer beam body and the support structure are arranged in an overlapping manner in the left-right direction of the whole vehicle, which can increase the lateral support ability of the sill beam position during a side collision of the whole vehicle. At the same time, the problem of abnormal noise after assembly can be avoided by leaving a gap between the support structure and the inner beam body.

[0020] Furthermore, a side step mounting skeleton is arranged on the outer beam body, which is beneficial to the setting of the vehicle side step, and at the same time, an energy absorption space can be formed by using the side step mounting skeleton extending outwards on the side of the body. The outer beam body and the side step mounting skeleton adopt extruded profiles, which is convenient for their preparation. The side step mounting skeleton is integrally formed with the outer beam body, having good connection strength, or the side step mounting skeleton is fixed to the outer beam body through a connecting structure, which is convenient for the repair and replacement of the side step mounting skeleton.

[0021] Another object of the present utility model is to propose a vehicle, and the vehicle is provided with the middle body structure as described above.

[0022] The vehicle and / or the middle body structure described in the present utility model have the same technical effects as those of the prior art, and will not be elaborated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The drawings constituting a part of the present utility model are used to provide a further understanding of the present utility model. The schematic embodiments and descriptions thereof of the present utility model are used to explain the present utility model and do not constitute an improper limitation to the present utility model. In the drawings:

[0024] Figure 1 is a schematic diagram of the overall structure of the middle body structure according to Embodiment 1 of the present utility model;

[0025] Figure 2 is a top view of the middle body structure according to Embodiment 1 of the present utility model;

[0026] Figure 3 is the Figure 2 cross-sectional view at the position shown by A-A in the present utility model;

[0027] DESCRIPTION OF THE REFERENCE NUMERALS IN THE DRAWINGS:

[0028] 1, sill beam;

[0029] 101, inner beam body; 102, outer beam body; 103, sill beam cavity; 104, connecting plate;

[0030] 2, seat cross beam;

[0031] 201, connecting bracket;

[0032] 3, reinforcing beam;

[0033] 4, front floor panel;

[0034] 5, support structure;

[0035] 6, side step mounting skeleton;

[0036] 601, connecting part; 602, extending part. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0037] It should be noted that, without conflict, the embodiments in the present utility model and the features in the embodiments may be combined with each other.

[0038] In the description of the present utility model, it should be noted that if terms indicating orientation or positional relationship such as "upper", "lower", "inner", "outer", etc. appear, they are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or component referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present utility model. In addition, if terms such as "first", "second", etc. appear, they are also only for descriptive purposes and should not be construed as indicating or implying relative importance.

[0039] In addition, in the description of the present utility model, unless otherwise clearly defined, the terms "installation", "connection", "connection", "connector" 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 components. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood in combination with specific situations.

[0040] The present utility model will be described in detail below with reference to the drawings and in conjunction with embodiments.

[0041] Embodiment 1

[0042] This embodiment relates to a middle part structure of a vehicle body, as Figure 1 shown. In the overall structure, it includes a sill beam 1, a seat crossbeam 2 whose end is connected to the sill beam 1, and a reinforcing beam 3 connected between the seat crossbeam 2 and the sill beam 1.

[0043] Among them, the reinforcing beam 3 is arranged near the end of the seat crossbeam 2, is arranged obliquely relative to the seat crossbeam 2, and a triangular structure is formed by the connection between the sill beam 1, the seat crossbeam 2 and the reinforcing beam 3.

[0044] With the above settings, by arranging the reinforcing beam 3, a triangular structure is formed among the sill beam 1, the seat crossbeam 2 and the reinforcing beam 3, increasing the connection points between the sill beam 1 and the seat crossbeam 2, which is beneficial to improving the body stiffness. At the same time, by forming a triangular structure, when a side collision occurs to the whole vehicle, the collision force can be fully transmitted to the seat crossbeam 2, realizing the transmission and dispersion of the collision force, and thus being beneficial to improving the collision safety of the whole vehicle.

[0045] Based on the above overall introduction, specifically, in this embodiment, the triangular structure formed between the reinforcing beam 3, the sill beam 1, and the seat crossbeam 2 not only improves the structural strength of the end plate of the seat crossbeam 2 when a side impact occurs to the whole vehicle, but also, when a frontal impact occurs to the whole vehicle, the inclined reinforcing beam 3 can support the seat crossbeam 2, preventing the end plate of the seat crossbeam 2 from tearing from the sill beam 1 and further enhancing the connection strength between the seat crossbeam 2 and the sill beam 1.

[0046] To further improve the safety of vehicle occupants during a side impact, in this embodiment, the reinforcing beam 3 is located on the front side of the seat crossbeam 2, and the reinforcing beam 3 is arranged obliquely towards the front side of the vehicle relative to the seat crossbeam 2. With this arrangement, the reinforcing beam 3 is located on the front side of the seat crossbeam 2 and is inclined towards the front of the vehicle, making the reinforcing beam 3 closer to the position of the occupants in the vehicle body, which can increase the body stiffness at the occupant position to a certain extent, thus being beneficial to further enhancing the safety of the occupants during a side impact.

[0047] Specifically, as Figure 2 shown, the distance L between the connection position between the seat crossbeam 2 and the sill beam 1 and the connection position between the reinforcing beam 3 and the sill beam 1 in this embodiment satisfies L≥120mm. By controlling the distance between the connection position of the seat crossbeam 2 and the sill beam 1 and the connection position of the reinforcing beam 3 and the sill beam 1, the reinforcing beam 3 has sufficient length in the front-rear direction of the vehicle to increase the strengthening range of the reinforcing beam 3 on the side of the whole vehicle, thereby improving the strengthening effect of the reinforcing beam 3 and further enhancing the protection effect on the vehicle occupants. At the same time, the setting of the distance between the connection position of the seat crossbeam 2 and the sill beam 1 and the connection position of the reinforcing beam 3 and the sill beam 1 enables the reinforcing beam 3 to effectively support the sill beam 1 when a side impact occurs to the whole vehicle, to a certain extent preventing the sill beam 1 from invading the occupant compartment due to the collision and enhancing the collision safety of the whole vehicle.

[0048] In this embodiment, to improve the connection strength between the reinforcing beam 3, the sill beam 1, and the seat crossbeam 2, the top of the reinforcing beam 3 is lap-connected to the top and the side of the sill beam 1, and the top of the reinforcing beam 3 is lap-connected to the top and the side of the seat crossbeam 2. Lap connection has a relatively large connection contact area, which can ensure the reliability of the connection between the reinforcing beam 3, the sill beam 1, and the seat crossbeam 2. In addition, the bottom of the reinforcing beam 3 in this embodiment is connected to the front floor panel 4, and a cavity is formed between the reinforcing beam 3 and the front floor panel 4, and both ends of the cavity are blocked by the sill beam 1 and the seat crossbeam 2 respectively. By forming a cavity by buckling the reinforcing beam 3 on the front floor panel 4, the characteristics of large structural strength of the cavity can be utilized to increase the stiffness of the reinforcing beam 3, which is beneficial to improving the strengthening effect of the reinforcing beam 3 on the vehicle body structure.

[0049] In order to improve the connection strength between the seat crossbeam 2 and the sill beam 1, the end of the seat crossbeam 2 in this embodiment is directly connected to the sill beam 1, and the seat crossbeam 2 overlaps and is connected to the top and the side of the sill beam 1. Alternatively, a connection bracket 201 is provided at the end of the seat crossbeam 2. The connection bracket 201 is connected to the sill beam 1, a reinforcing beam 3 is connected to the connection bracket 201, and the connection bracket 201 overlaps and is connected to the top and the side of the sill beam 1.

[0050] By directly overlapping and connecting the seat crossbeam 2 and the sill beam 1, there is a large connection contact area, which can ensure the connection strength between the seat crossbeam 2 and the sill beam 1. Or by connecting through the connection bracket 201 to meet the setting requirements of different seat crossbeams 2. At the same time, the setting of the connection bracket 201 enables the seat crossbeam 2 or the connection bracket 201 to be connected to the top and the side of the sill beam 1, which can also ensure the reliability of the connection between the seat crossbeam 2 and the sill beam 1. In specific implementation, in the body middle structure of this embodiment, there are two connection methods: the end of the seat crossbeam 2 is directly connected to the sill beam 1 and the seat crossbeam 2 is connected to the sill beam 1 through the connection bracket 201.

[0051] In addition, as Figure 1 and Figure 3 shown, the sill beam 1 of this embodiment includes an inner beam body 101 and an outer beam body 102 that are connected together in the left - right direction of the whole vehicle.

[0052] Among them, both the inner beam body 101 and the outer beam body 102 extend along the front - rear direction of the whole vehicle. The inner beam body 101 is made of steel sheet metal, the cross - section of the outer beam body 102 is set as a multi - cavity energy - absorbing structure, and a sill beam cavity 103 is formed between the inner beam body 101 and the outer beam body 102. By setting the inner beam body 101 and the outer beam body 102, the sill beam cavity 103 formed between them can increase the overall stiffness of the sill beam 1.

[0053] At the same time, the cross - section of the outer beam body 102 is set as a multi - cavity energy - absorbing structure. The advantages of high strength of the multi - cavity structure can be utilized to increase the structural strength of the sill position. Also, when the vehicle has a side collision, the characteristics that the multi - cavity energy - absorbing structure can fully collapse and absorb energy can be utilized to improve the energy - absorbing effect during the side collision of the vehicle body, thereby further enhancing the safety of the vehicle during side collision.

[0054] In specific implementation, the cross-section of the inner beam body 101 of this embodiment is in a "U" - shaped structure with the opening facing the outer beam body 102. The outer beam body 102 is snap - connected to the opening of the cross - section of the inner beam body 101, and a sill beam cavity 103 is defined inside the inner beam body 101, which can increase the structural strength of the inner beam body 101. Meanwhile, it is also beneficial to form the sill beam cavity 103, and then the overall strength and force - transmission effect of the sill beam 1 structure can be improved by utilizing the cavity feature.

[0055] Moreover, turned - up edges are respectively formed on the upper and lower sides of the inner beam body 101. One or both of the bottom and the top of the outer beam body 102 are connected with a connecting plate 104, and the inner beam body 101 is connected to the outer beam body 102 through the connecting plate 104. Connecting the inner beam body 101 to the outer beam body 102 through the connecting plate 104 can, with the help of the connection of the connecting plate 104, make it convenient for the outer beam body 102 to be welded to surrounding components, thus avoiding inconvenience to the work of the general assembly welding line body.

[0056] To further improve the structural strength of the sill beam 1, a support structure 5 located inside the sill beam cavity 103 is provided on the outer beam body 102 of this embodiment. In the vehicle's left - right direction, one side of the support structure 5 is connected to the outer beam body 102, and the other side of the support structure 5 extends towards the inner beam body 101 and has a gap with the inner beam body 101. Through the setting of the support structure 5, the outer beam body 102 and the support structure 5 are arranged in an overlapping manner in the vehicle's left - right direction, which can increase the structural strength of the sill beam 1, increase the lateral support ability of the sill beam 1 during vehicle side - impact, and at the same time, by leaving a gap between the support structure 5 and the inner beam body 101, the problem of abnormal noise after assembly can be avoided. And the support structure 5 divides the interior of the sill beam cavity 103 into two nested force - transmission channels, which can form two - level collapse energy absorption, thus having a better energy - absorption effect.

[0057] In specific implementation, a cavity is formed inside the support structure 5 and is arranged along the vehicle's front - rear direction. This cavity can increase the overall structural strength of the support structure 5, further improve the reinforcement effect of the support structure 5 on the outer beam body 102, and thus enhance the structural strength of the sill beam 1.

[0058] In addition, as a specific implementation form, a side - step mounting skeleton 6 is provided on the outer beam body 102 of this embodiment. The side - step mounting skeleton 6 extends along the vehicle's front - rear direction, and in the vehicle's left - right direction, one side of the side - step mounting skeleton 6 is connected to the outer beam body 102, and the other side of the side - step mounting skeleton 6 extends in the direction pointing outside the vehicle. By setting the side - step mounting skeleton 6, it is not only beneficial to the setting of the vehicle side - step, but also can form an energy - absorption space by using the side - step mounting skeleton 6 extending on the side of the vehicle body, which can improve the energy - absorption effect during vehicle side - impact.

[0059] In specific implementation, a cavity extending in the longitudinal direction of the vehicle body is formed in the side step mounting skeleton 6. The setting of this cavity can increase the structural strength of the side step mounting skeleton 6 itself. At the same time, the side step mounting skeleton 6 includes a connecting portion 601 connected to the outer side beam 102 and an extending portion 602 connected to the connecting portion 601. And in the left-right direction of the vehicle body, along the direction pointing to the connecting portion 601, the wall thickness of the extending portion 602 is gradually increased. By making the wall thickness of the extending portion 602 gradually increase along the direction pointing to the connecting portion 601, that is, along the direction pointing to the inside of the vehicle, the stiffness of the extending portion 602 gradually increases from the outside to the inside, improving the overall structural strength of the side step mounting skeleton 6. And during a side collision of the vehicle body, the extending portion 602 of the side step mounting skeleton 6 forms a step-by-step crushing energy absorption, which helps to improve the energy absorption effect.

[0060] Finally, both the outer side beam 102 and the side step mounting skeleton 6 in this embodiment are made of extruded profiles. And the side step mounting skeleton 6 is integrally formed with the outer side beam 102, or the side step mounting skeleton 6 is connected to the outer side beam 102 through a connecting structure. Using extruded profiles for the outer side beam 102 and the side step mounting skeleton 6 can facilitate the production and preparation of the outer side beam 102 and the side step mounting and fixing, and can also ensure that they have good structural strength. At the same time, the integral formation of the outer side beam 102 and the side step mounting skeleton 6 can also ensure the connection strength and reliability between the two. When the side step mounting skeleton 6 is connected to the outer side beam 102 through a connecting structure, the flexibility of the setting of the side step mounting skeleton 6 can be increased, facilitating the disassembly and assembly of the side step mounting skeleton 6, and thus facilitating the maintenance and replacement work of the side step mounting skeleton 6.

[0061] In specific implementation, the support structure 5 in this embodiment is also integrally formed on the outer side beam 102. When the outer side beam 102 and the side step mounting skeleton 6 are extruded and formed, preferably extruded aluminum can be used, which can reduce the weight of the sill beam 1 while ensuring that the outer side beam 102, that is, the sill beam 1 as a whole, has good structural strength.

[0062] In summary, for the body middle structure in this embodiment, by setting the reinforcing beam 3, a triangular structure is formed among the sill beam 1, the seat cross beam 2, and the reinforcing beam 3, increasing the connection points between the sill beam 1 and the seat cross beam 2, which is beneficial to improving the body stiffness. At the same time, by forming a triangular structure, during a side collision of the vehicle, the collision force can be fully transmitted to the seat cross beam 2, realizing the transmission and dispersion of the collision force, and thus being beneficial to improving the collision safety of the whole vehicle, and having good practicability.

[0063] Embodiment Two

[0064] This embodiment relates to a vehicle, in which a body middle structure as described in Embodiment One is provided.

[0065] Through the above-mentioned setting of the vehicle body middle structure in this embodiment, the connection strength between the sill beam 1 and the seat cross beam 2 is strengthened, which is beneficial to improving the stiffness of the vehicle body. At the same time, the reinforcing beam 3 is connected to the sill beam 1 and the seat cross beam 2, so that the reinforcing beam 3 plays a protective role for the position of the occupants in the vehicle body, thereby enhancing the safety of the whole vehicle in a collision.

[0066] The above are only the preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A vehicle body mid-section structure, characterized in that: It comprises a threshold beam (1), a seat cross beam (2) whose end is connected to the threshold beam (1), and a reinforcing beam (3) connected between the seat cross beam (2) and the threshold beam (1); The reinforcing beam (3) is arranged close to the end of the seat cross beam (2) and is arranged obliquely relative to the seat cross beam (2), and the threshold beam (1), the seat cross beam (2) and the reinforcing beam (3) are connected to form a triangular structure.

2. The vehicle body mid-section structure according to claim 1, characterized in that: The reinforcing beam (3) is located on the front side of the seat cross beam (2), and the reinforcing beam (3) is arranged tilted toward the front side of the vehicle relative to the seat cross beam (2).

3. The vehicle body mid-section structure according to claim 2, characterized in that: A distance L between a connection position between the seat cross beam (2) and the threshold beam (1), and a distance L between a connection position between the reinforcement beam (3) and the threshold beam (1) satisfy L≥120 mm.

4. The vehicle body mid-section structure according to claim 1, characterized in that: The reinforcing beam (3) is overlapped and connected to the top of the threshold beam (1) and the side of the threshold beam (1); the reinforcing beam (3) is overlapped and connected to the top of the seat cross beam (2) and the side of the seat cross beam (2); and / or, The bottom of the reinforcing beam (3) is connected to the front floor panel (4), and a cavity is formed between the reinforcing beam (3) and the front floor panel (4), and the two ends of the cavity are respectively blocked by the door sill beam (1) and the seat cross beam (2).

5. The vehicle body mid-section structure according to claim 1, characterized in that: The end of the seat cross beam (2) is directly connected to the threshold beam (1), and the seat cross beam (2) is overlapped and connected to the top of the threshold beam (1) and the side of the threshold beam (1); or, A connecting bracket (201) is provided at the end of the seat crossbeam (2), the connecting bracket (201) is connected to the threshold beam (1), the reinforcing beam (3) is connected to the connecting bracket (201), and the connecting bracket (201) is overlapped and connected to the top of the threshold beam (1) and the side of the threshold beam (1).

6. The vehicle body mid-section structure according to any one of claims 1 to 5, characterized in that: The threshold beam (1) comprises an inner beam body (101) and an outer beam body (102) connected together in the left-right direction of the whole vehicle; The inner beam body (101) and the outer beam body (102) both extend in the front-rear direction of the vehicle, and the inner beam body (101) is made of steel sheet metal. The cross section of the outer beam body (102) is configured as a multi-cavity energy absorption structure, and a sill beam cavity (103) is formed between the inner beam body (101) and the outer beam body (102).

7. The vehicle body mid-section structure according to claim 6, characterized in that: The outer side beam body (102) is provided with a support structure (5) located in the door sill beam cavity (103); In the left-right direction of the vehicle, one side of the support structure (5) is connected to the outer beam body (102), and the other side of the support structure (5) extends toward the inner beam body (101) with a gap between the inner beam body (101).

8. The vehicle body mid-section structure according to claim 6, characterized in that: A side step mounting frame (6) is provided on the outer side beam body (102), and the side step mounting frame (6) extends in the front-rear direction of the whole vehicle, and in the left-right direction of the whole vehicle, one side of the side step mounting frame (6) is connected to the outer side beam body (102), and the other side of the side step mounting frame (6) extends in a direction pointing outward from the vehicle.

9. The vehicle body mid-section structure according to claim 8, characterized in that: The outer side beam body (102) and the side step mounting frame (6) are both made of extruded profiles, and the side step mounting frame (6) and the outer side beam body (102) are integrally formed, or the side step mounting frame (6) is connected to the outer side beam body (102) via a connecting structure.

10. A vehicle, characterized in that: The vehicle is provided with the vehicle body mid-section structure according to any one of claims 1 to 9.

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