Lower vehicle body structure and vehicle

Abstract

The utility model provides a lower vehicle body structure and a vehicle. The lower vehicle body structure comprises threshold beams arranged on the left side and the right side respectively, a seat cross beam and a front floor cross beam, wherein the seat cross beam and the front floor cross beam are arranged between the threshold beams on the two sides. The seat cross beam is located above a front floor, the front floor cross beam is located below the front floor and corresponds to the seat cross beam up and down, and the two ends of the front floor cross beam are connected with the threshold beams on the two sides. According to the lower vehicle body structure, through the arrangement of the front floor cross beam, the lateral supporting rigidity of the vehicle body can be improved, the force transmission effect during side collision of the vehicle can be improved, the safety of side collision of the vehicle is improved, and the lower vehicle body structure has good practicability.

Description

Technical Field

[0001] The utility model relates to the technical field of vehicle bodies, and in particular to a lower body structure. The utility model also relates to a vehicle provided with the lower body structure. Background Art

[0002] In the related art, in order to install the front seats of the vehicle, a seat crossbeam is generally provided at the front floor position of the lower vehicle body. The seat crossbeam extends along the left and right directions of the vehicle and is located between the left and right door sill beams. At the same time, a mounting bracket is usually provided on the seat crossbeam, and the front seats are installed on the mounting bracket.

[0003] At present, the installation requirements of the front seats can be met by setting the seat crossbeam. However, since the connection between the seat crossbeam and the door sill beams on both sides is generally weak, it will not only affect the lateral support stiffness of the vehicle body (i.e. along the left and right direction of the vehicle), but also be detrimental to the transmission and dispersion of the collision force when the vehicle collides, especially when a side collision occurs, and it is also easy to affect the survival space of the passenger compartment due to increased crumple, which is not conducive to improving the safety of the vehicle in side collisions. Utility Model Content

[0004] In view of this, the utility model aims to provide an underbody structure to increase the lateral rigidity of the vehicle body and improve the safety of the vehicle in side collisions.

[0005] In order to achieve the above object, the technical solution of the utility model is implemented as follows:

[0006] A lower vehicle body structure, comprising sill beams arranged on left and right sides, and a seat cross beam and a front floor cross beam arranged between the sill beams on both sides;

[0007] The seat cross beam is located above the front floor, the front floor cross beam is located below the front floor and is arranged correspondingly to the seat cross beam up and down, and both ends of the front floor cross beam are connected to the threshold beams on both sides.

[0008] Further, the seat crossbeam is buckled on the top of the front floor, and a cavity is formed between the seat crossbeam and the front floor; and / or,

[0009] The front floor crossbeam is buckled with the bottom of the front floor and forms a cavity between the front floor and the front floor.

[0010] Furthermore, the seat cross beam extends from the threshold beam on one side to the threshold beam on the other side, and an end of the seat cross beam is connected to the threshold beam or is arranged close to the threshold beam.

[0011] Furthermore, the seat cross beam includes a front cross beam and a rear cross beam which are arranged at intervals along the front-rear direction of the vehicle, and the front floor cross beams are respectively provided corresponding to the front cross beam and the rear cross beam.

[0012] Furthermore, it also includes front floor longitudinal beams arranged on the left and right sides;

[0013] The front floor longitudinal beams on both sides are located below the front floor, and the front floor longitudinal beams on each side are located on the inner side of the door sill beam on the same side;

[0014] The front floor cross beam is connected between the front floor longitudinal beams on both sides, and corresponding to the front floor cross beam, a threshold longitudinal beam connecting plate is connected between the front floor longitudinal beams on both sides and the threshold beam;

[0015] The front floor cross beam is connected to the sill beam through the front floor longitudinal beams on each side and the sill longitudinal beam connecting plates.

[0016] Furthermore, the sill longitudinal beam connecting plates on each side are buckled on the bottom of the front floor, and a cavity is formed between the sill longitudinal beam connecting plates and the front floor.

[0017] Furthermore, the front end of the front floor longitudinal beam on each side is connected to the rear end of the front cabin longitudinal beam on the same side, and the rear end of the front floor longitudinal beam on each side is connected to the front end of the rear floor longitudinal beam on the same side.

[0018] Furthermore, it also includes a lower front wall reinforcement beam located at the bottom of the front wall of the vehicle body;

[0019] The front panel lower reinforcement beam extends along the left-right direction of the vehicle and is connected to the front cabin longitudinal beams on both sides, and the front panel lower reinforcement beam is connected to the door sill beams on both sides through a torsion box.

[0020] Furthermore, inner side of the front cabin longitudinal beams on both sides are respectively provided with longitudinal beam inner connecting plates, and the longitudinal beam inner connecting plates on each side are connected between the front cabin longitudinal beam and the front enclosure lower reinforcing beam on the same side.

[0021] Compared with the prior art, the utility model has the following advantages:

[0022] The lower vehicle body structure described in the utility model can increase the lateral support and connection structure formed by the front floor cross beam on the basis of the seat cross beam by arranging a front floor cross beam below the front floor and correspondingly arranged above and below the seat cross beam, and connecting the front floor cross beam to the door sill beams on both sides. As a result, not only can the common support of the seat cross beam and the front floor cross beam be utilized to increase the lateral stiffness of the vehicle body, but also the common force transmission of the seat cross beam and the front floor cross beam can be utilized to increase the lateral collision force transmission and dispersion capability, thereby improving the safety of the vehicle in side collision, and has good practicality.

[0023] In addition, a cavity is formed between the seat crossbeam and the front floor, and between the front floor crossbeam and the front floor, and the strength of the cavity structure can be used to increase the support stiffness and collision force transmission performance of the seat crossbeam and the front floor crossbeam. The seat crossbeam extends from the threshold beam on one side to the threshold beam on the other side, so that the seat crossbeam forms a through force transmission channel, which can increase the transmission effect of the collision force. The seat crossbeam includes a front crossbeam and a rear crossbeam arranged at intervals, which can facilitate the installation of the front seats and also help increase the stability of the front seat installation. The front floor crossbeam is set corresponding to the front and rear crossbeams, which can better increase the lateral support stiffness of the vehicle body and the lateral collision force transmission effect.

[0024] Secondly, by setting the front floor longitudinal beam and the door sill longitudinal beam connecting plate, not only can the connection between the front floor cross beam and the door sill beam be achieved, but the front floor longitudinal beam can also be used to further increase the structural strength of the lower body, and increase the collision force transmission channel, which can improve the collision force transmission dispersion effect. The door sill longitudinal beam connecting plate and the front floor enclosure form a cavity. The high structural strength of the cavity can also be used to increase the structural strength of the door sill longitudinal beam connecting plate, and improve its connection and collision force transmission capabilities. The front and rear ends of the front floor longitudinal beam are respectively connected to the front cabin longitudinal beam and the rear floor longitudinal beam, so that the front cabin longitudinal beam and the rear floor longitudinal beam can be connected through the front floor longitudinal beam to form a longitudinal force transmission channel, which can improve the collision force transmission capacity on the basis of the force transmission channel at the door sill beam position, which is conducive to better improving the collision safety of the whole vehicle.

[0025] In addition, by setting the lower front wall reinforcement beam and making the lower front wall reinforcement beam connected not only to the front cabin longitudinal beam but also to the sill beams on both sides through the torsion box, the lower front wall reinforcement beam, torsion box, sill beam, front floor longitudinal beam, front floor cross beam and sill longitudinal beam connecting plate can be connected in the lower body to form a front floor ring frame structure and a multi-ring reinforcement structure, which can strengthen the body structure, increase the overall rigidity of the body, and also facilitate the transmission and dispersion of collision force, thereby improving collision safety. By setting the longitudinal beam inner connecting plate connected to the lower front wall reinforcement beam on the inner side of the front cabin longitudinal beam, the reliability of the connection between the front cabin longitudinal beam and the lower front wall reinforcement beam can be ensured, which helps to transmit the collision force between the front cabin longitudinal beam and the lower front wall reinforcement beam.

[0026] Another object of the present invention is to provide a vehicle, wherein the vehicle is provided with the above-mentioned lower vehicle body structure.

[0027] The vehicle described in the utility model can increase the overall rigidity of the lower vehicle body by arranging the above-mentioned lower vehicle body structure, can improve the safety of vehicle collision, especially side collision, and has good practicality. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention. In the accompanying drawings:

[0029] Figure 1 It is a schematic diagram of the lower vehicle body structure according to an embodiment of the utility model;

[0030] Figure 2 for Figure 1 A schematic diagram of the structure shown from a bottom perspective;

[0031] Figure 3 for Figure 2 Schematic diagram of the middle structure (minus the front floor, rear floor and rear floor longitudinal beam);

[0032] Figure 4 It is a schematic diagram of the connection between the seat cross beam and the door sill beam according to the embodiment of the utility model;

[0033] Figure 5 This is a schematic diagram of a seat crossbeam according to an embodiment of the utility model when it is arranged close to a door sill beam;

[0034] Figure 6 It is a schematic structural diagram of the front floor longitudinal beam, the front floor cross beam and the door sill longitudinal beam connecting plate according to an embodiment of the utility model;

[0035] Description of reference numerals:

[0036] 1. Door sill beam; 2. Front floor; 3. Seat crossbeam; 4. Rear floor; 5. Center channel; 6. Front body wall; 7. Front cabin longitudinal beam; 8. A-pillar; 9. Front floor crossbeam; 10. Front floor longitudinal beam; 11. Door sill longitudinal beam connecting plate; 12. Front wall lower reinforcement beam; 13. Torque box; 14. Longitudinal beam inner reinforcement plate; 15. Rear floor longitudinal beam;

[0037] 301, front cross beam; 302, rear cross beam; 3a, lap plate. DETAILED DESCRIPTION

[0038] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other.

[0039] In the description of the present invention, it should be noted that if there are terms such as "upper", "lower", "inner", "outer" and the like indicating orientation or positional relationship, they are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention 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 cannot be understood as limiting the present invention. In addition, if there are terms such as "first" and "second", they are also used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0040] In addition, in the description of the present invention, unless otherwise clearly defined, the terms "installation", "connection", "connection" and "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 a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood in combination with specific circumstances.

[0041] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments.

[0042] Embodiment 1

[0043] This embodiment relates to a lower vehicle body structure, combined with Figure 1 and Figure 2 As shown in , the lower vehicle body structure includes sill beams 1 disposed on the left and right sides, and a seat cross beam 3 and a front floor cross beam 9 disposed between the sill beams 1 on both sides.

[0044] Among them, the seat cross beam 3 is located above the front floor 2, and the front floor cross beam 9 is located below the front floor 2, and is arranged corresponding to the seat cross beam 3 up and down. At the same time, both ends of the front floor cross beam 9 are also connected to the door sill beams 1 on both sides.

[0045] At this time, as set above, by setting a front floor crossbeam 9 arranged above and below the seat crossbeam 3 under the front floor 2, and connecting the front floor crossbeam 9 to the door sill beams 2 on both sides, this embodiment can increase the lateral (i.e., the left and right direction of the whole vehicle) support and connection structure formed by the front floor crossbeam 9 on the basis of the seat crossbeam 3. In this way, not only can the common support of the seat crossbeam 3 and the front floor crossbeam 9 be used to increase the lateral stiffness of the vehicle body, but also the common force transmission of the seat crossbeam 3 and the front floor crossbeam 9 can be used in the event of a vehicle collision, especially a side collision, to increase the transmission and dispersion capability of the lateral collision force, thereby improving the safety of the vehicle in a side collision.

[0046] Based on the above overall introduction, specifically, it should be pointed out that, similar to the relevant structures in the existing vehicle body, the front floor 2 in this embodiment is connected between the side sill beams 1, and its front end is generally connected to the bottom end of the vehicle body front wall 6, and its rear end is generally connected to the front end of the rear floor 4, or the rear floor front cross beam located at the front end of the rear floor 4. At the same time, the connection between the front floor 2 and the side sill beams 1, and between the front floor 2 and the vehicle body front wall 6 and the rear floor 4, etc., can also refer to the relevant structures in the existing vehicle body.

[0047] In this embodiment, continue to combine Figures 3 to 6 As shown in FIG. 1 , as a preferred embodiment, the seat cross beam 3 may adopt a “U” shaped cross section with the opening facing downward, and in the specific configuration, the seat cross beam 3 may be as shown in FIG. Figure 1 The front floor cross beam 9 shown in the figure is buckled on the top of the front floor 2 and forms a cavity between the front floor 2. In addition, similar to the seat cross beam 3, in specific implementation, the front floor cross beam 9 of this embodiment can also adopt a "U"-shaped cross section with an opening facing upward, and the front floor cross beam 9 is also buckled on the bottom of the front floor 2 and forms a cavity between the front floor 2.

[0048] When the seat cross beam 3 and the front floor cross beam 9 are buckled on the front floor 2, of course, in specific implementation, the seat cross beam 3 and the front floor cross beam 9 are usually fixed together with the front floor 2 by welding. And it can be understood that, by forming a cavity between the seat cross beam 3 and the front floor 2, and between the front floor cross beam 9 and the front floor 2, this embodiment can utilize the high strength of the cavity structure to increase the support stiffness and collision force transmission performance of the seat cross beam 3 and the front floor cross beam 9.

[0049] Still Figure 1 As shown in the figure, as a preferred implementation form, the seat cross beam 3 of this embodiment specifically extends from the threshold beam 1 on one side to the threshold beam 1 on the other side. In this way, the seat cross beam 3 is arranged between the threshold beams 1 on both sides, so that the seat cross beam 3 can form a through force transmission channel, so as to increase its transmission effect on the collision force.

[0050] In addition, in this embodiment, for the seat cross beam 3 and the threshold beams 1 on both sides, an implementation form can be seen, for example, Figure 4 As shown, the end of the seat cross beam 3 is connected to the door sill beam 1, and specifically, the lap plate 3a formed at the end of the seat cross beam 3 is overlapped and fixedly connected to the door sill beam 1. Alternatively, another embodiment can also be as follows Figure 5 As shown, the end of the seat cross beam 3 is only arranged close to the door sill beam 1 but is not connected to the door sill beam 1 .

[0051] In specific implementation, the above two arrangements between the seat cross beam 3 and the threshold beam 1 can be selected according to the arrangement requirements of the surrounding structures in the vehicle body. In addition, it should be noted that both ends of the seat cross beam 1 are connected to the threshold beam 1, or both ends of the seat cross beam 3 are not connected to the threshold beam 1, or one end of the seat cross beam 3 is connected to the threshold beam 1, and the other end is arranged close to the threshold beam 1, which are all possible.

[0052] In this embodiment, Figures 1 to 3 As shown in , as a preferred embodiment, the seat cross beam 3 may include a front cross beam 301 and a rear cross beam 302 arranged at intervals along the front-to-rear direction of the vehicle, and a front floor cross beam 9 is respectively arranged corresponding to the front cross beam 301 and the rear cross beam 302. At this time, the seat cross beam 3 includes the front cross beam 301 and the rear cross beam 302 arranged at intervals, which can facilitate the installation of the front seats in the vehicle and also help to increase the stability of the front seat installation. The front floor cross beam 9 is respectively arranged corresponding to the front and rear cross beams, which can obviously better increase the lateral support stiffness of the vehicle body and the lateral collision force transmission effect.

[0053] It is worth noting that when the seat cross beam 3 is composed of the front cross beam 301 and the rear cross beam 302 arranged at intervals, the front cross beam 301 and the rear cross beam 302 can adopt the same structure, or the two can also be slightly different in structure, as long as the front cross beam 301 and the rear cross beam 302 can meet the installation requirements of the front seats and provide the required lateral support and collision force transmission functions.

[0054] Continued by Figure 2 , Figure 3 and Figure 6 As shown in , as a preferred implementation form, the lower vehicle body structure of this embodiment also includes front floor longitudinal beams 10 arranged on the left and right sides, wherein the front floor longitudinal beams 10 on both sides are also located below the front floor 2 and extend along the front and rear direction of the vehicle, and the front floor longitudinal beams 10 on each side are also located on the inner side of the door sill beam 1 on the same side.

[0055] In addition, based on the arrangement of the front floor longitudinal beams 10 on both sides, the front floor cross beam 9 is specifically connected between the front floor longitudinal beams 10 on both sides, and corresponding to the front floor cross beam 9, a sill longitudinal beam connecting plate 11 is also connected between the front floor longitudinal beams 10 on both sides and the sill beam 1, and the front floor cross beam 9 is connected to the sill beam 1 through the front floor longitudinal beams 10 on each side and the sill longitudinal beam connecting plate 11.

[0056] It can be understood that, through the arrangement of the above-mentioned front floor longitudinal beam 10 and the door sill longitudinal beam connecting plate 11, this embodiment can not only realize the connection between the front floor cross beam 9 and the door sill beams 1 on both sides, but also can utilize the front floor longitudinal beam 10 to further increase the structural strength of the lower vehicle body and increase the collision force transmission channel, thereby also achieving the effect of improving the collision force transmission and dispersion capability of the vehicle body.

[0057] In the specific implementation, preferably, the sill longitudinal beam connecting plates 11 on each side can be, for example, multiple, arranged at intervals along the front-rear direction of the vehicle. In addition, as a feasible implementation form, the front floor longitudinal beam 10 and the sill longitudinal beam connecting plates 11 can be, for example, stamped sheet metal parts, and both can also be "U"-shaped sections with the opening facing upward, so that each sill longitudinal beam connecting plate 11 is buckled and connected to the bottom of the front floor 2, and a cavity is formed between the sill longitudinal beam connecting plates 11 and the front floor 2. At the same time, the front floor longitudinal beams 10 on both sides are also buckled and connected to the front floor 2, and a cavity is formed between the sill longitudinal beam connecting plates 11 and the front floor 2.

[0058] Therefore, by forming a cavity between the sill longitudinal beam connecting plate 11 and the front floor 2, and also forming a cavity between the front floor longitudinal beam 10 and the front floor 2, the present embodiment can also utilize the high strength of the cavity structure to increase the structural strength of each sill longitudinal beam connecting plate 11 and the front floor longitudinal beams 10 on both sides, so as to enhance the connection and collision force transmission capabilities of the sill longitudinal beam connecting plate 11, as well as the structural reinforcement and collision force transmission capabilities of the front floor longitudinal beam 10.

[0059] In this embodiment, in addition to being connected to the front floor 2 by welding, each sill longitudinal beam connecting plate 11 and the sill beam 1, as well as each sill longitudinal beam connecting plate 11 and the front floor longitudinal beam 10 can also be connected by welding. In order to facilitate the connection, a connecting flange can be formed at the end of the "U"-shaped sill longitudinal connecting plate 11 so as to be connected to the sill beam 1 or the front floor longitudinal beam 10 through the connecting flange.

[0060] Still Figure 2 As shown in , as a preferred implementation form, in the lower vehicle body structure of this embodiment, the front end of each side front floor longitudinal beam 10 is specifically connected to the rear end of the same side front engine compartment longitudinal beam 7, and the rear end of each side front floor longitudinal beam 10 is connected to the front end of the same side rear floor longitudinal beam 15. At this time, by connecting the front and rear ends of the front floor longitudinal beam 10 to the front engine compartment longitudinal beam 7 and the rear floor longitudinal beam 15 respectively, it is obvious that the front engine compartment longitudinal beam 7 and the rear floor longitudinal beam 15 can be connected through the front floor longitudinal beam 10 to form a longitudinal force transmission channel, thereby adding a new longitudinal (i.e., the front and rear direction of the whole vehicle) force transmission channel on the basis of the force transmission channel at the position of the door sill beam 1, thereby helping to improve the collision force transmission capacity and helping to better improve the collision safety of the whole vehicle.

[0061] In a specific implementation, the front floor longitudinal beam 10 and the front cabin longitudinal beam 7, as well as the front floor longitudinal beam 10 and the rear floor longitudinal beam 15, can be connected by welding after overlapping. Figure 2 and Figure 3 As shown, the second lower vehicle body structure of the present embodiment also includes a front panel lower reinforcement beam 12 located at the bottom of the vehicle body front panel 6, the front panel lower reinforcement beam 12 extends along the left-right direction of the vehicle, and is connected to the front engine compartment longitudinal beams 7 on both sides, and the front panel lower reinforcement beam 12 is also connected to the door sill beams 1 on both sides through a torsion box 13.

[0062] At this time, the front wall lower reinforcement beam 12 can also be made of conventional stamped sheet metal, for example, and can be connected to the vehicle body front wall 6, and to the front cabin longitudinal beam 7 and the torsion box 13 on each side by welding. Moreover, in the lower vehicle body of the present embodiment, in addition to being connected to the torsion boxes 13 on both sides and connected to the sill beam 1 through the torsion boxes 13, the left and right ends of the front wall lower reinforcement beam 12 can also be connected to the A-pillars 8 on both sides, so as to be connected to the surrounding structures such as the sill beam 1 through the A-pillars 8 at the same time.

[0063] In addition, in the lower body of the present embodiment, based on the arrangement of the front wall lower reinforcement beam 12, the front end of the middle channel 5 can be further connected to the front wall lower reinforcement beam 12, while the rear end of the middle channel 5 can be connected to the front wall lower reinforcement beam 12. Figure 1 As shown in the figure, it is connected to the front cross beam 301 in front, so that the middle channel 5 can be used to form a force transmission channel between the front lower reinforcement beam 12 and the seat cross beam 3, which is beneficial to the transmission and dispersion of the collision force in the vehicle body.

[0064] It can be understood from the present embodiment that, by setting the above-mentioned front panel lower reinforcement beam 12, the front panel lower reinforcement beam 12 is not only connected to the front engine compartment longitudinal beam 7, but also connected to the door sill beams 1 on both sides through the torsion box 13. The front panel lower reinforcement beam 12, the torsion box 13, the door sill beam 1, the front floor longitudinal beam 10, the front floor cross beam 9 and the door sill longitudinal beam connecting plate 11 can be connected in the lower vehicle body to form a front floor ring frame structure and a multi-ring reinforcement structure, thereby strengthening the vehicle body structure and increasing the overall rigidity of the vehicle body. At the same time, it can also facilitate the transmission and dispersion of the collision force, so as to achieve the effect of improving the collision safety of the vehicle.

[0065] In this embodiment, on the basis of the connection between the front enclosure lower reinforcement beam 12 and the front cabin longitudinal beams 7 on both sides, as a preferred implementation form, continue to refer to Figure 2 and Figure 3 As shown, inner connecting plates 14 are provided on the inner sides of the front cabin longitudinal beams 7 on both sides, and the inner connecting plates 14 on each side are connected between the front cabin longitudinal beam 7 and the front enclosure lower reinforcing beam 12 on the same side.

[0066] In this way, by arranging the longitudinal beam inner connection plate 14 connected to the front wall lower reinforcement beam 12 on the inner side of each front cabin longitudinal beam 7, the reliability of the connection between the front cabin longitudinal beam 7 and the front wall lower reinforcement beam 12 can be ensured, which helps to transmit the collision force between the front cabin longitudinal beam 7 and the front wall lower reinforcement beam 12. In specific implementation, the longitudinal beam inner connection plate 14 is also made of stamped sheet metal, and is connected between the front cabin longitudinal beam 7 and the front wall lower reinforcement beam 12 by welding.

[0067] The lower vehicle body structure of the present embodiment adopts the above design, by arranging a front floor cross beam 8 corresponding to the seat cross beam 3 above and below under the front floor 2, and connecting the front floor cross beam 9 to the door sill beams 1 on both sides, it is possible to increase the lateral support and connection structure formed by the front floor cross beam 9 on the basis of the seat cross beam 3, thereby not only utilizing the common support of the seat cross beam 3 and the front floor cross beam 9 to increase the lateral stiffness of the vehicle body, but also utilizing the common force transmission of the seat cross beam 3 and the front floor cross beam 9 to increase the lateral collision force transmission and dispersion capability, and thus having good practicality.

[0068] At the same time, on the basis of setting the above-mentioned front floor cross beam 9, by setting the above-mentioned front floor longitudinal beam 10, the door sill longitudinal beam connecting plate 11 and the front enclosure lower reinforcement beam 12, and by connecting the front floor longitudinal beam 10 between the front cabin longitudinal beam 7 and the rear floor longitudinal beam 15. In this embodiment, when the vehicle collides, for a lateral collision, the lateral transmission of the door sill connecting plate 11 and the front floor cross beam 9 can be used, combined with the longitudinal transmission of the door sill beam 1 and the front floor longitudinal beam 10, etc., to achieve the transmission and absorption of the lateral collision force. For a head-on collision or rear collision, while the rear floor longitudinal beam 15, the door sill beam 1, the front floor longitudinal beam 10 and the front cabin longitudinal beam 7 are longitudinally transmitted and absorbed, the front floor cross beam 9 can also be used to achieve the lateral transmission and absorption of the collision force, thereby improving the collision safety of the vehicle.

[0069] Embodiment 2

[0070] This embodiment relates to a vehicle, in which the lower vehicle body structure in the first embodiment is provided.

[0071] The vehicle of this embodiment, by setting up the lower body structure in the first embodiment, can utilize the common support of the seat cross beam 3 and the front floor cross beam 9 to increase the lateral stiffness of the vehicle body, and can also utilize the common force transmission of the front floor cross beam 9 and the front floor longitudinal beam 10 to increase the collision force transmission and dispersion capability, thereby improving the safety of the vehicle in side collision, and has good practicality.

[0072] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A lower vehicle body structure, characterized in that: It comprises a threshold beam (1) arranged on the left and right sides, and a seat cross beam (3) and a front floor cross beam (9) arranged between the threshold beams (1) on both sides; The seat cross beam (3) is located above the front floor (2), the front floor cross beam (9) is located below the front floor (2) and is arranged correspondingly to the seat cross beam (3) up and down, and the two ends of the front floor cross beam (9) are connected to the door sill beams (1) on both sides.

2. The lower vehicle body structure according to claim 1, characterized in that: The seat crossbeam (3) is buckled onto the top of the front floor (2) and forms a cavity between the seat crossbeam (3) and the front floor (2); and / or, The front floor crossbeam (9) is buckled onto the bottom of the front floor (2) and forms a cavity between the front floor (2) and the front floor (2).

3. The lower vehicle body structure according to claim 1, characterized in that: The seat cross beam (3) extends from the threshold beam (1) on one side to the threshold beam (1) on the other side, and an end of the seat cross beam (3) is connected to the threshold beam (1) or is arranged close to the threshold beam (1).

4. The lower vehicle body structure according to claim 1, characterized in that: The seat cross beam (3) comprises a front cross beam (301) and a rear cross beam (302) arranged at intervals along the front-rear direction of the vehicle, and the front floor cross beam (9) is respectively arranged corresponding to the front cross beam (301) and the rear cross beam (302).

5. The lower vehicle body structure according to any one of claims 1 to 4, characterized in that: It also includes front floor longitudinal beams (10) arranged on the left and right sides; The front floor longitudinal beams (10) on both sides are located below the front floor (2), and the front floor longitudinal beams (10) on each side are located on the inner side of the door sill beam (1) on the same side; The front floor cross beam (9) is connected between the front floor longitudinal beams (10) on both sides, and corresponding to the front floor cross beam (9), a sill longitudinal beam connecting plate (11) is connected between the front floor longitudinal beams (10) on both sides and the sill beam (1); The front floor cross beam (9) is connected to the sill beam (1) via the front floor longitudinal beams (10) on each side and the sill longitudinal beam connecting plates (11).

6. The lower vehicle body structure according to claim 5, characterized in that: The sill longitudinal beam connecting plates (11) on each side are buckled onto the bottom of the front floor (2), and a cavity is formed between the sill longitudinal beam connecting plates (11) and the front floor (2).

7. The lower vehicle body structure according to claim 5, characterized in that: The front end of the front floor longitudinal beam (10) on each side is connected to the rear end of the front cabin longitudinal beam (7) on the same side, and the rear end of the front floor longitudinal beam (10) on each side is connected to the front end of the rear floor longitudinal beam (15) on the same side.

8. The lower vehicle body structure according to claim 7, characterized in that: It also includes a front wall lower reinforcement beam (12) located at the bottom of the front wall of the vehicle body (6); The front enclosure lower reinforcement beam (12) extends in the left-right direction of the vehicle and is connected to the front cabin longitudinal beams (7) on both sides, and the front enclosure lower reinforcement beam (12) and the door sill beams (1) on both sides are connected via a torsion box (13).

9. The lower vehicle body structure according to claim 8, characterized in that: The inner sides of the front cabin longitudinal beams (7) on both sides are respectively provided with longitudinal beam inner connecting plates (14), and the longitudinal beam inner connecting plates (14) on each side are connected between the front cabin longitudinal beam (7) on the same side and the front enclosure lower reinforcing beam (12).

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

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