Front floor structure and vehicle

Abstract

The utility model relates to the technical field of vehicle bodies, and provides a front floor structure and a vehicle, the front floor structure comprises threshold beams arranged on the left side and the right side respectively, a front floor panel located between the threshold beams on the two sides, and a seat cross beam located above the front floor panel; the seat cross beam is integrally formed and is of an arc-shaped structure which is gradually arched upwards from the left end to the right end to the middle in the left-right direction of the whole vehicle, the bottom of the seat cross beam is connected with the front floor panel in a buckled mode, and therefore the cross section of the seat cross beam is a closed cross section. According to the front floor structure, the integrally-formed and arc-shaped seat cross beam is utilized, the gap requirement of pipeline arrangement in the middle of the front floor can be met, the front floor can be universally used among platforms of different vehicle types, meanwhile, the safety of side collision of the vehicle is improved, and the front floor structure has good practicability.

Description

TECHNICAL FIELD

[0001] The utility model relates to vehicle body technical field, especially a front floor structure and vehicle. BACKGROUND

[0002] At present, the front floor in the vehicle body can be generally divided into two main forms, one is that the middle channel is formed by the protrusion of the front floor and is applied to the traditional fuel vehicle type and the hybrid vehicle type, and the middle channel position is used to arrange the pipeline or exhaust system in the vehicle, and the other is that the front floor is pure flat and is used to the pure electric vehicle type so as to arrange the battery pack at the bottom.

[0003] The front floor of the above two forms often cannot be used among different vehicle type platforms, and the independent development of the independent front floor will lead to the increase of the development cost of the whole vehicle. SUMMARY

[0004] Therefore, the utility model aims at providing a front floor structure to improve the universality of the front floor and improve the safety of the vehicle side collision.

[0005] To achieve the above-mentioned purpose, the technical scheme of the utility model is as follows:

[0006] A front floor structure comprises the rocker beams arranged on the left and right sides, the front floor panel between the rocker beams on the left and right sides, and the seat cross beam above the front floor panel.

[0007] The seat cross beam is integrally formed and is in the arc-shaped structure which gradually arches upward from the left and right ends to the middle part in the left-right direction of the whole vehicle, and the bottom of the seat cross beam is connected with the front floor panel to make the cross section of the seat cross beam position be the closed cross section.

[0008] Further, the seat cross beam is roll-formed, and each position of the seat cross beam is provided with the equal cross section in the left-right direction of the whole vehicle.

[0009] Further, the seat cross beam comprises a plurality of cross beam bodies which are sequentially connected in the front-rear direction of the whole vehicle.

[0010] The cross section of each cross beam body is in the shape of Chinese character 'j', and the bottom of each cross beam body is connected with the front floor panel to make the cross section of each cross beam body position be the closed cross section.

[0011] Further, a structure reinforcing part is arranged on the top of at least one of the beam bodies, the structure reinforcing part extends along the left-right direction of the vehicle, and the structure reinforcing part is formed by the beam body protruding downward.

[0012] Further, the seat beam is connected with the two side sill beams, and the seat beam and each side sill beam are connected through a sill upper connecting plate.

[0013] Further, the two side sill upper connecting plates are buckled and connected on the front floor panel, and form a cavity with the front floor panel.

[0014] The two ends of the seat beam are respectively provided with an extension part in the cavity, and each side extension part is connected with the same side sill upper connecting plate.

[0015] Further, the seat beam and the two side sill upper connecting plates are provided with a seat mounting bracket, and the seat mounting bracket on the sill upper connecting plate is located above the extension part.

[0016] Further, the front floor lower longitudinal beams are arranged on the left and right sides.

[0017] The two side front floor lower longitudinal beams are located below the front floor panel, and each side front floor lower longitudinal beam is connected with the same side sill upper connecting plate through a connecting piece crossing the front floor panel.

[0018] Further, each side front floor lower longitudinal beam is connected with the same side sill beam through a sill lower connecting plate.

[0019] Each side sill lower connecting plate is arranged in correspondence with the same side sill upper connecting plate, and each side sill upper connecting plate and the sill lower connecting plate are connected with the front floor panel through multi-layer welding.

[0020] Compared with the prior art, the utility model has the following advantages:

[0021] The front floor structure has the advantages that: the seat beam is integrally formed and has an upwardly arched structure, and the cross section of the seat beam at the middle position of the front floor is a closed cross section, so that the arched structure with a high middle portion and low side portions can meet the clearance requirement of the pipeline arrangement at the middle position of the front floor, and help to realize the universality of the front floor among different vehicle platforms, and the middle portion of the seat beam is not bent, so that the seat beam can form a continuous force transmission channel, and help to improve the safety of vehicle side impact, and meanwhile, the integrally formed seat beam also helps to realize the integrated design of the seat beam, and can reduce the number of parts and tooling, and help to reduce the development and manufacturing cost of the seat beam, and has good practicability.

[0022] In addition, the seat cross beam is roll formed, and each position of the seat cross beam is provided with an equal cross section, so that the seat cross beam is convenient to manufacture and the structural strength of the seat cross beam is ensured. The seat cross beam comprises a plurality of cross beam bodies connected in sequence, and the cross section of each cross beam body is in the shape of a U, and each cross beam body is formed in a closed cross section, so that the structural strength of the seat cross beam is ensured by the U-shaped structure with high structural strength. The structural reinforcement part is arranged on the top of the cross beam body and protrudes downward from the cross beam body, so that the seat cross beam is thinned and lightened by the reinforcing effect of the structural reinforcement part.

[0023] In addition, the seat cross beam is roll formed, and each position of the seat cross beam is provided with an equal cross section, so that the seat cross beam is convenient to manufacture and the structural strength of the seat cross beam is ensured. The seat cross beam comprises a plurality of cross beam bodies connected in sequence, and the cross section of each cross beam body is in the shape of a U, and each cross beam body is formed in a closed cross section, so that the structural strength of the seat cross beam is ensured by the U-shaped structure with high structural strength. The structural reinforcement part is arranged on the top of the cross beam body and protrudes downward from the cross beam body, so that the seat cross beam is thinned and lightened by the reinforcing effect of the structural reinforcement part.

[0024] In addition, the seat cross beam is roll formed, and each position of the seat cross beam is provided with an equal cross section, so that the seat cross beam is convenient to manufacture and the structural strength of the seat cross beam is ensured. The seat cross beam comprises a plurality of cross beam bodies connected in sequence, and the cross section of each cross beam body is in the shape of a U, and each cross beam body is formed in a closed cross section, so that the structural strength of the seat cross beam is ensured by the U-shaped structure with high structural strength. The structural reinforcement part is arranged on the top of the cross beam body and protrudes downward from the cross beam body, so that the seat cross beam is thinned and lightened by the reinforcing effect of the structural reinforcement part.

[0025] In addition, the seat cross beam is roll formed, and each position of the seat cross beam is provided with an equal cross section, so that the seat cross beam is convenient to manufacture and the structural strength of the seat cross beam is ensured. The seat cross beam comprises a plurality of cross beam bodies connected in sequence, and the cross section of each cross beam body is in the shape of a U, and each cross beam body is formed in a closed cross section, so that the structural strength of the seat cross beam is ensured by the U-shaped structure with high structural strength. The structural reinforcement part is arranged on the top of the cross beam body and protrudes downward from the cross beam body, so that the seat cross beam is thinned and lightened by the reinforcing effect of the structural reinforcement part.

[0026] Another purpose of the utility model lies in providing a vehicle, the vehicle body of which is provided with the front floor structure.

[0027] The vehicle has the same beneficial effects as the front floor structure, and details are not repeated here. BRIEF DESCRIPTION OF DRAWINGS

[0028] The accompanying drawings, which form a part of this patent, are included to provide a further understanding of the application and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the principles of the application. In the drawings:

[0029] Figure 1 A schematic view of a front floor structure according to an embodiment of the application;

[0030] Figure 2 A schematic view of a front floor structure according to an embodiment of the application; Figure 1

[0031] Figure 3 A sectional view of position A-A in the schematic view shown in Figure 1; Figure 1

[0032] Figure 4 A sectional view of position B-B in the schematic view shown in Figure 1; Figure 1

[0033] A schematic view of a seat cross beam and an upper threshold connecting plate combined together according to an embodiment of the application; Figure 5

[0034] A schematic view of a seat cross beam and an upper threshold connecting plate combined together according to an embodiment of the application; Figure 6 Figure 5 A schematic view of a seat cross beam and an upper threshold connecting plate combined together according to an embodiment of the application;

[0035] Figure 7 A sectional view of position D-D in the schematic view shown in Figure 1;

[0036] Figure 8 Figure 7 A schematic view of a front floor panel according to an embodiment of the application;

[0037] Figure 9 A schematic view of a front floor panel according to an embodiment of the application;

[0038] Figure 10 A sectional view of position C-C in the schematic view shown in Figure 1; Figure 1

[0039] A sectional view of position E in the schematic view shown in Figure 1; Figure 11 Figure 5 A schematic view of an upper threshold connecting plate according to an embodiment of the application;

[0040] Figure 12 BRIEF DESCRIPTION OF THE DRAWINGS

[0041] BRIEF DESCRIPTION OF THE DRAWINGS

[0042] 1, threshold beam; 2, front floor panel; 3, seat cross beam; 4, upper threshold connecting plate; 5, front floor lower longitudinal beam; 6, lower threshold connecting plate; 7, seat mounting bracket; 8, connecting piece;

[0043] ​​​​​201, middle channel; 3a, extension; 301, beam main body; 302, structure reinforcing part; 401, lap joint edge; 402, connecting edge;

[0044] Q, cavity. DETAILED DESCRIPTION

[0045] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict.

[0046] In the following description, specific details are set forth in order to provide a thorough understanding of embodiments of the application. However, persons having ordinary skill in the art will readily recognize that embodiments of the application can be practiced without these specific details. In other instances, well-known structures, devices, circuits, and processes have not been described in detail so as not to unnecessarily obscure aspects of the application.

[0047] In the description of the present application, it should be noted that if the terms indicating the orientation or position relationship such as "upper", "lower", "inner", "outer" and the like appear, they are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present application. In addition, if the terms "first", "second" and the like appear, they are also only for the purpose of description, and cannot be understood as indicating or implying relative importance.

[0048] In addition, in the description of the present application, unless otherwise explicitly limited, the connecting structure between cooperating components can be connected by conventional connection structure in the art. Moreover, the terms "mounting", "connecting", "connecting", "connecting member" should be understood broadly. For example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium, or it can be the communication between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood in combination with the specific circumstances.

[0049] The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0050] Embodiment one

[0051] The embodiment relates to a front floor structure which can be applied to a traditional fuel vehicle, and the front floor structure of the embodiment can also be applied to a new energy vehicle such as a pure electric vehicle or a hybrid vehicle in addition to the fuel vehicle, and the front floor structure of the embodiment can improve the universality among different vehicle platforms and the safety during a side collision of the vehicle through the structural design of a seat cross beam 3.

[0052] Overall, in combination with the embodiment shown in Figures 1 to 4 The front floor structure of the embodiment comprises a rocker beam 1 arranged on the left side and the right side, a front floor panel 2 arranged between the rocker beams 1, and the seat cross beam 3 arranged above the front floor panel 2.

[0053] The seat cross beam 3 is integrally formed and has an arc-shaped structure which gradually arches upward from the left end and the right end to the middle part in the left-right direction of the vehicle, and the bottom of the seat cross beam 3 is connected to the front floor panel 2, so that the cross section of the seat cross beam 3 is a closed cross section.

[0054] At this time, by integrally forming the seat cross beam 3 into an arc-shaped structure which arches upward and making the cross section of the seat cross beam 3 a closed cross section, the embodiment can meet the clearance requirement of the pipeline arrangement of the vehicle at the middle position of the front floor by the arc-shaped design of the seat cross beam 3 which is high in the middle and low on both sides, help to realize the universality of the front floor among different vehicle platforms, and make the middle part of the seat cross beam 3 not have a bending position, so that the seat cross beam 3 can form a continuous force transmission channel to improve the safety during a side collision of the vehicle.

[0055] Based on the overall introduction, specifically, first of all, it is worth pointing out that in addition to realizing the universality of the front floor among different vehicle platforms and improving the safety during a side collision of the vehicle, of course, the integrally formed seat cross beam 3 can also help to realize the integrated design of the seat cross beam 3, reduce the number of parts and tooling, and reduce the development and preparation cost of the seat cross beam 3.

[0056] At the same time, by making the seat cross beam 3 have an arc-shaped structure which gradually arches upward from the left end and the right end to the middle part, the embodiment can also decompose the collision force upward during a side collision of the vehicle, so that the side collision force can be better transmitted horizontally to ensure the transmission and dispersion effect of the collision force. In addition, the arc-shaped design of the seat cross beam 3 can also take advantage of the high strength of the arc-shaped structure to ensure the structural strength of the seat cross beam 3 and improve the rigidity of the front floor position.

[0057] In the embodiment, it should be noted that, in order to better show the arrangement of the seat cross beam 3 on the front floor panel 2, the front floor panel 2 is shown in Figure 1 and Figure 2Only one of the side rocker beams 1 is shown in the figure. Furthermore, still referring to Figure 1 As shown in the figure, in the embodiment, the seat cross beam 3 in the arc structure may, for example, be a rear seat cross beam on the front floor panel 2, and the front seat cross beam on the front side of the rear seat cross beam may adopt a conventional structure form.

[0058] Of course, in addition to making the front seat cross beam on the front floor panel still adopt a conventional structure form, in the case of meeting the arrangement requirements of the seat cross beam 3 in the arc structure, for example, the middle channel 201 on the front floor panel 2 is low in height, or the middle channel 201 is not provided on the front floor panel 2, the front seat cross beam may also adopt the seat cross beam 3 introduced in the embodiment.

[0059] In the embodiment, the side rocker beams 1 and the front floor panel 2 in the middle all adopt conventional structure forms in the existing vehicle body, and for example, the rocker beams 1 and the front floor panel 2 can all adopt a welded structure formed by stamping a sheet metal.

[0060] In addition, for the seat cross beam 3 in the embodiment, as a preferred embodiment form, it may, for example, be a sheet metal part formed by roll forming, and still referring to Figure 3 and Figure 4 As shown in the figures, in the vehicle left-right direction, the positions of the seat cross beam 3 may also be designed to be of equal cross section. In this way, the seat cross beam 3 is roll-formed, and the positions of the seat cross beam 3 are designed to be of equal cross section, which obviously can take advantage of the characteristics of roll forming to facilitate the preparation of the seat cross beam 3, while also being able to ensure the structural strength of the seat cross beam 3 itself.

[0061] Continuing as shown in Figures 5 to 8 Based on the roll forming of the seat cross beam 3, in the specific structure, as a preferred embodiment form, the embodiment may, for example, make the seat cross beam 3 include a plurality of cross beam bodies 301 connected in sequence in the vehicle front-rear direction.

[0062] Among them, the cross section of each cross beam body 301 is in the shape of a "J", and the bottom of each cross beam body 301 is connected together with the front floor panel 2 in a snap-fit manner, so that the cross section of the position of each cross beam body 301 is a closed cross section.

[0063] At this time, by making the seat cross beam 3 include a plurality of cross beam bodies 301 connected in sequence, and making the cross section of each cross beam body 301 be in the shape of a "J" and also be connected together with the front floor panel 2 in a snap-fit manner to form a closed cross section, it can be understood that it can take advantage of the characteristics of the "J" shape with high structural strength to ensure the structural strength of each cross beam body 301, and further to better ensure the overall structural strength of the seat cross beam 3.

[0064] In this embodiment, it is worth noting that it is still by Figure 3 and Figure 4 and continue to combine Figure 9 As shown, the front floor panel 2 is designed to be fastened to the bottom of the seat crossbeam 3, especially the bottom of each crossbeam body 301, to form a closed section at the location of each crossbeam body 301. For the structural design of the front floor panel 2, please refer to... Figure 9 In the specific implementation, the front floor panel 2 can be partially adjusted according to the shape of the bottom of the seat beam 3 at the location indicated by the reference number E, so that the front floor panel 2 can be adapted to the seat beam 3 and form a closed section after the two are connected.

[0065] In practice, after being fastened to the front floor panel 2, the main beams 301 of each crossbeam in the seat crossbeam 3 can generally be connected to the front floor panel 2 by spot welding.

[0066] In this embodiment, based on the seat crossbeam 3 comprising multiple crossbeam bodies 301, as a preferred implementation, it still refers to... Figure 8 As shown, a structural reinforcement 302 may be provided on the top of one of the crossbeam bodies 301. The structural reinforcement 302 extends in the left-right direction of the vehicle and is specifically formed by the crossbeam body 301 protruding downward.

[0067] At this point, by providing a structural reinforcement 302 protruding downwards from the top of the main body 301 of the crossbeam, the reinforcing effect of the structural reinforcement 302 can be used to reduce the material thickness of the seat crossbeam 3, thereby achieving a weight reduction effect. Furthermore, it should be noted that, in addition to providing the aforementioned structural reinforcement 302 on the top of only one of the main bodies 301 of the crossbeam, depending on the number of the main bodies 301 of the crossbeam, and the size specifications of each main body 301, the structural reinforcement 302 can also be provided on the top of multiple main bodies 301, or even on the top of all the main bodies 301 of the crossbeam.

[0068] In this embodiment, similar to the existing configuration in the front floor of a vehicle, the seat crossbeam 3 is also connected to the side door sill beams 1, and the end of the seat crossbeam 3 can be directly connected to the door sill beam 1, for example. However, as a preferred embodiment, it is still... Figure 1 , Figure 5 and Figure 6 As shown, the seat crossbeam 3 and each side sill beam 1 can be connected, for example, through a connecting plate 4 on the sill.

[0069] Thus, by connecting the seat cross beam 3 with the two side rocker beams 1 through the rocker upper connecting plates 4, on one hand, the seat cross beam 3 and the two side rocker beams 1 can be connected to form a frame structure, which can not only increase the structural strength of the front floor position, but also increase the transverse force transmission channel at the front floor position, which is beneficial to the transmission and dispersion of the collision force when the vehicle is side-impacted. On the other hand, the adoption of the rocker upper connecting plates 4 can obviously facilitate the connection operation between the seat cross beam 3 and the rocker beams 1, in the case that the seat cross beam 3 is integrally roll-formed.

[0070] Continuing as shown in Figure 10 , when the rocker upper connecting plates 4 are adopted, preferably, the two side rocker upper connecting plates 4 can also be buckled and connected to the front floor panel 2, and form a cavity Q with the front floor panel 2. At the same time, further, in combination with Figure 6 and Figure 7 shown, the embodiment can also be provided with an extension 3a at each end of the seat cross beam 3, which is located in the cavity Q, and each side extension 3a is connected with the same side rocker upper connecting plate 4.

[0071] At this time, by buckling and connecting the rocker upper connecting plates 4 to the front floor panel 2, and forming a cavity Q with the front floor panel 2, the structural strength of the position of the rocker upper connecting plates 4 can be increased, which is helpful to increase the energy absorption capacity of the inner side position of the rocker beams 1 when the vehicle is side-impacted. By providing the extension 3a at the end of the seat cross beam 3, the connection strength between the seat cross beam 3 and the rocker upper connecting plates 4 can be increased, which is helpful to improve the smoothness of the force transmission channel formed between the seat cross beam 3 and the rocker beams 1.

[0072] In the embodiment, as shown in Figure 5 and Figure 11 , seat mounting brackets 7 are provided on the seat cross beam 3 and the two side rocker upper connecting plates 4, and still referring to Figure 10 shown, the seat mounting bracket 7 on the rocker upper connecting plate 4 is also located above the extension 3a.

[0073] In this way, by providing the seat mounting brackets 7 on the seat cross beam 3 and the two side rocker upper connecting plates 4, the installation and arrangement of the vehicle seat can be facilitated, and by locating the seat mounting bracket 7 on the rocker upper connecting plate 4 above the extension 3a, it can obviously ensure the support strength of the seat mounting bracket 7 at this position by using the extension 3a, which is beneficial to ensure the stability of the vehicle seat installation.

[0074] Still as shown in Figure 2 and Figure 11As shown in the figure, as a preferred embodiment, the front floor structure of this embodiment also includes front floor under longitudinal beams 5 disposed on the left and right sides. The front floor under longitudinal beams 5 on both sides are located below the front floor panel 2. The front floor under longitudinal beams 5 on each side are arranged side by side on the inner side of the threshold beam 1 on the same side. Based on the arrangement of the front floor under longitudinal beams 5 on both sides, the connecting plate 4 on each side threshold is also connected to the front floor under longitudinal beam 5 on the same side through the connector 8 that passes through the front floor panel 2.

[0075] It is understandable that by connecting the connecting plates 4 on each side of the door sill to the longitudinal beam 5 under the front floor on the same side, the problem of weld failure can be avoided, which is conducive to improving the stability of the door sill connecting plates 4 and the longitudinal beam 5 under the front floor.

[0076] In practice, it is necessary to combine Figure 12 As shown, for example, extended connecting edges 402 can be provided on the front and rear sides of the connecting plate 4 on the threshold, and connecting holes can be opened on each connecting edge 402. The connecting holes can penetrate the front floor panel 2, and the connecting member 8 can usually be a bolt that passes through the connecting hole to connect the connecting plate 4 on the threshold and the longitudinal beam 5 under the front floor by screwing.

[0077] Still Figure 12 As shown, it is worth noting that, for connection with the sill beam 1, an overlapping edge 401 can still be provided at one end of the connecting plate 4 on the sill. The overlapping edge 401 can adopt the conventional setting form in the existing vehicle body to keep the connection method between the seat crossbeam 3 and the sill beam 1 unchanged, and also to improve the platformization and the commonality of various vehicle platforms.

[0078] In this embodiment, based on the aforementioned arrangement of the longitudinal beams 5 under the front floor on each side, as a preferred implementation, a sill connecting plate 6 can be connected between the longitudinal beams 5 under the front floor on each side and the sill beam 1 on the same side. The sill connecting plate 6 on each side not only connects the sill beam 1 and the longitudinal beams 5 under the front floor on the same side, but also corresponds vertically to the sill connecting plate 4 on the same side. At the same time, both the sill connecting plate 4 on the sill and the sill connecting plate 6 on each side are connected to the front floor panel 2 by multi-layer welding.

[0079] In this way, by setting the lower sill connecting plate 6 and making the upper sill connecting plates and the lower sill beam connecting plates of each side sill connected together with the front floor panel by multi-layer welding, a side impact force transmission channel can be formed between the sill beam 1 and the lower longitudinal beam 5 of the front floor, increasing the side impact force transmission effect. At the same time, it can obviously also use the connected upper and lower sill connecting plates and the front floor panel 2 to further improve the energy absorption effect of the inner side of the sill beam 1 during a side impact, thus helping to improve the side impact safety of the vehicle.

[0080] The front floor structure of the embodiment is designed as above, the seat cross beam 3 is integrally formed and has an upwardly arched arc structure, the clearance requirement of pipeline arrangement at the middle position of the front floor is met, the universal use of the front floor structure between different vehicle platforms is facilitated, there is no bending position at the middle of the seat cross beam 3, a continuous force transmission channel is formed, the vehicle side crash safety is improved, the seat cross beam 3 is integrally formed, the integrated design of the seat cross beam 3 is facilitated, the number of parts and tooling is reduced, the development and manufacturing cost of the seat cross beam 3 is reduced, and the seat cross beam 3 has good practicability.

[0081] Embodiment two

[0082] The embodiment relates to a vehicle, the vehicle body of which is provided with the front floor structure in embodiment one.

[0083] The vehicle of the embodiment is provided with the front floor structure in embodiment one, the seat cross beam 3 integrally formed on the front floor and having an arc shape can meet the clearance requirement of pipeline arrangement at the middle position of the front floor, the universal use of the front floor structure between different vehicle platforms is facilitated, the vehicle side crash safety is improved, and the vehicle has good practicability.

[0084] The above merely describes preferred embodiments of the utility model and is not used to limit the utility model, and any modification, equivalent replacement, improvement and the like made within the spirit and principle of the utility model should be included in the protection scope of the utility model.

Claims

1. A front floor structure, characterized in that: It includes sill beams (1) separately arranged on the left and right sides, a front floor panel (2) located between the two sill beams (1) on both sides, and a seat crossbeam (3) located above the front floor panel (2); The seat crossbeam (3) is integrally formed and is an arc-shaped structure that gradually arches upward from the left and right ends to the middle in the vehicle's left-right direction. And the bottom of the seat crossbeam (3) is snap-connected to the front floor panel (2), so that the cross-section at the position of the seat crossbeam (3) is a closed cross-section.

2. The front floor structure according to claim 1, characterized in that: The seat crossbeam (3) is roll-formed, and in the vehicle's left-right direction, each position of the seat crossbeam (3) is set with an equal cross-section.

3. The front floor structure according to claim 2, characterized in that: The seat crossbeam (3) includes a plurality of crossbeam main bodies (301) connected in sequence in the vehicle's front-back direction; The cross-section of each crossbeam main body (301) is in a "U" shape, and the bottom of each crossbeam main body (301) is snap-connected to the front floor panel (2), so that the cross-section at the position of each crossbeam main body (301) is a closed cross-section.

4. The front floor structure according to claim 3, characterized in that: A structural reinforcement part (302) is provided on the top of at least one of the crossbeam main bodies (301). The structural reinforcement part (302) extends in the vehicle's left-right direction, and the structural reinforcement part (302) protrudes downward from the crossbeam main body (301).

5. The front floor structure according to any one of claims 1 to 4, characterized in that: The seat crossbeam (3) is connected to the sill beams (1) on both sides, and the seat crossbeam (3) and each side sill beam (1) are connected by a sill upper connecting plate (4).

6. The front floor structure according to claim 5, characterized in that: Both sides of the sill upper connecting plate (4) are snap-connected to the front floor panel (2) and enclose a cavity (Q) with the front floor panel (2); Both ends of the seat crossbeam (3) are respectively provided with extension parts (3a) located in the cavity (Q), and each side extension part (3a) is connected to the same side sill upper connecting plate (4).

7. The front floor structure according to claim 6, characterized in that: Seat mounting brackets (7) are provided on the seat crossbeam (3) and both sides of the sill upper connecting plate (4), and the seat mounting brackets (7) on the sill upper connecting plate (4) are located above the extension parts (3a).

8. The front floor structure according to claim 5, characterized in that: It further includes front floor lower longitudinal beams (5) separately arranged on the left and right sides; Both sides of the front floor lower longitudinal beams (5) are located below the front floor panel (2), and each side sill upper connecting plate (4) is connected to the same side front floor lower longitudinal beam (5) through a connecting part (8) passing through the front floor panel (2).

9. The front floor structure according to claim 8, characterized in that: A rocker lower connecting plate (6) is connected between each side of the front floor lower longitudinal beam (5) and the same side of the rocker beam (1); Each side of the rocker lower connecting plate (6) is arranged in correspondence with the same side of the rocker upper connecting plate (4) up and down, and each side of the rocker upper connecting plate (4) and the rocker lower connecting plate (6) are connected together with the front floor panel (2) by multi-layer welding.

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

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