Lower automobile body frame and automobile

Abstract

The utility model discloses a lower vehicle body frame and an automobile, the lower vehicle body frame comprises a forecabin frame and a front floor frame connected with the forecabin frame, the front floor frame comprises a front seat front cross beam, a front seat rear cross beam, a central channel, a sled plate and two threshold beams, and the two threshold beams extend in the longitudinal direction of a vehicle body and are arranged at intervals; the front seat front cross beam and the front seat rear cross beam are arranged in the longitudinal direction of a vehicle body in a spaced mode, and the two ends of the front seat front cross beam and the two ends of the front seat rear cross beam are connected with the two threshold beams correspondingly. The two ends of the central channel are connected to the rear end of the front cabin frame and the front seat front cross beam respectively. The number of the sleigh plates is two, the two sleigh plates are arranged on the two sides of the central channel respectively, and the two ends of each sleigh plate are connected to the rear end of the front cabin frame and the front cross beam of the front seat respectively. Five longitudinal stress transmission paths are formed by the doorsill beams, the central channel and the sleigh plates, energy of forward collision is dispersed and transmitted backwards, and the overall force transmission performance of a vehicle is improved.

Description

Technical Field

[0001] The utility model relates to the field of automobiles, in particular to a lower body frame and an automobile. Background Art

[0002] In the modern automobile industry, the lower body frame structure of a passenger car is a core component of vehicle engineering. The lower body frame not only bears the important responsibility of protecting the safety of passengers, but also has a profound impact on the overall performance, weight, cost and production efficiency of the vehicle. The front floor frame structure in the prior art is loose, and there are few longitudinal force transmission paths of the vehicle body. Therefore, there is an urgent need for a lower body frame that can improve the longitudinal force transmission path of the vehicle body. Summary of the Utility Model

[0003] An embodiment of the utility model provides a lower body frame and an automobile to solve the problems of the loose structure of the prior front floor frame and few longitudinal force transmission paths of the vehicle body.

[0004] Specifically, the utility model provides a lower body frame, including a front cabin frame and a front floor frame connected to the front cabin frame. The front floor frame includes a front seat front cross beam, a front seat rear cross beam, a central tunnel, a sled plate and two sill beams. The two sill beams extend along the longitudinal direction of the vehicle body and are arranged at intervals; the front seat front cross beam and the front seat rear cross beam are arranged at intervals along the longitudinal direction of the vehicle body, and both ends of the front seat front cross beam and the front seat rear cross beam are respectively connected to the two sill beams;

[0005] Both ends of the central tunnel are respectively connected to the rear end of the front cabin frame and the front seat front cross beam; the number of the sled plates is two, and the two sled plates are respectively arranged on both sides of the central tunnel, and both ends of the sled plate are respectively connected to the rear end of the front cabin frame and the front seat front cross beam;

[0006] The sill beam includes a fourth hollow tube and an upper middle rib and a lower middle rib arranged in the fourth hollow tube. The upper middle rib and the lower middle rib are arranged at intervals in the vertical direction to divide the fourth hollow tube into an upper cavity, a middle cavity and a lower cavity. The lower middle rib is horizontally arranged, and one end of the lower middle rib close to the front seat front cross beam and / or the front seat rear cross beam is higher than the end away from the front seat front cross beam.

[0007] Optionally, the sill beam further includes a third reinforcing rib and a fourth reinforcing rib. The third reinforcing rib is arranged crosswise with the upper middle rib and the lower middle rib, and the fourth reinforcing rib is connected to the top wall of the fourth hollow tube and the lower middle rib; the third reinforcing rib is located on the side of the fourth reinforcing rib away from the front seat front cross beam.

[0008] Optionally, the front seat front cross member is a cross-sectionally constant pipe structure with reinforcing ribs provided therein.

[0009] The front seat rear cross member is a cross-sectionally constant pipe structure with reinforcing ribs provided therein.

[0010] Optionally, the front floor frame further includes a front floor sealing pressing plate, the front end of the front floor sealing pressing plate is connected to the front cabin frame, and the left and right ends are respectively connected to the sill beams on both sides; the bottom walls of the front floor sealing pressing plate and the sill beams are both used for connecting the battery pack.

[0011] Optionally, the front cabin frame includes a front anti-collision beam and a front energy absorption box. The front energy absorption box includes a fifth hollow pipe and a fifth reinforcing rib provided in the fifth hollow pipe. The fifth reinforcing rib connects two opposite side walls of the fifth hollow pipe and extends along the length direction of the fifth hollow pipe; the length of the front energy absorption box is 270 mm to 400 mm.

[0012] Optionally, the front cabin frame includes an A-pillar assembly, an upper front wall cross member, a middle front wall cross member, and a lower front wall cross member. The upper front wall cross member, the middle front wall cross member, and the lower front wall cross member are connected to the A-pillar assembly; both ends of the central tunnel and the sled plate are respectively connected to the lower front wall cross member and the front seat front cross member.

[0013] Optionally, the underbody frame further includes a rear floor frame, and the rear floor frame is connected to the front floor frame.

[0014] The rear floor frame includes a rear floor body, rear floor rear side beams, a rear energy absorption box, and a rear anti-collision beam. The rear end of the rear energy absorption box is fixedly connected to the rear anti-collision beam, and the front end is connected to the rear floor rear side beam. The rear floor rear side beam is connected to the rear floor body.

[0015] Optionally, the rear floor rear side beam includes a first hollow pipe and at least one first reinforcing rib provided in the first hollow pipe. The first reinforcing rib connects two opposite side walls of the first hollow pipe and extends along the length direction of the first hollow pipe.

[0016] The rear anti-collision beam includes a second hollow pipe and a second reinforcing rib provided in the second hollow pipe. The second reinforcing rib connects two opposite side walls of the second hollow pipe and extends along the length direction of the second hollow pipe.

[0017] The rear energy absorption box includes a third hollow pipe, and the axial direction of the third hollow pipe is parallel to the axial direction of the first hollow pipe.

[0018] The present utility model also provides an automobile, which includes the underbody frame as described in any one of the above.

[0019] The beneficial effects of the present utility model are as follows:

[0020] In the underbody frame and the automobile provided by the present utility model, since the central tunnel and the sled plate are arranged between the rear end of the front cabin frame and the front cross member of the front seat, they receive the energy from the front and transmit it to the rear, transferring the energy from the frontal collision and the offset collision, and at the same time greatly improving the bending performance. Moreover, since the two ends of the front cross member of the front seat are connected to the sill beam, the forces on the central tunnel and the sled plate can be received and decomposed onto the rear mounting cross member of the front seat and then transmitted to the sill beam, forming five longitudinal force transmission paths, so as to disperse the energy of the frontal collision and transmit it backward, improving the overall force transmission performance. Further, the length of the front energy absorber can be specifically set according to the requirements of different vehicle models to adapt to the application of multiple vehicle models in a platform. Description of the Drawings

[0021] In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings required for the description of the embodiments of the present utility model will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present utility model, and those of ordinary skill in the art can also obtain other drawings based on these drawings without creative efforts.

[0022] Figure 1 It is a schematic structural diagram of the underbody frame in an embodiment of the present utility model;

[0023] Figure 2 It is a schematic partial structural diagram of the rear floor frame in an embodiment of the present utility model;

[0024] Figure 3 It is a schematic cross-sectional view of the underbody frame in an embodiment of the present utility model;

[0025] Figure 4 It is a schematic partial cross-sectional view of the underbody frame in an embodiment of the present utility model;

[0026] Figure 5 It is a schematic structural diagram of the underbody frame in an embodiment of the present utility model;

[0027] Figure 6 It is a schematic structural diagram of the front floor frame in the underbody frame in an embodiment of the present utility model;

[0028] Figure 7 It is a schematic partial cross-sectional view of the front energy absorber in the underbody frame in an embodiment of the present utility model;

[0029] Figure 8It is a schematic partial sectional view of the lower body frame in an embodiment of the present utility model;

[0030] Figure 9 It is a schematic partial sectional view of the lower body frame in an embodiment of the present utility model;

[0031] Figure 10 It is a schematic sectional view of the sled plate in the lower body frame in an embodiment of the present utility model;

[0032] Figure 11 It is a schematic sectional view of the front longitudinal beam in the lower body frame in an embodiment of the present utility model;

[0033] Figure 12 It is a schematic partial sectional view of the lower body frame in an embodiment of the present utility model;

[0034] Figure 13 It is a schematic partial structural view of the central tunnel in the lower body frame in an embodiment of the present utility model.

[0035] In the figure: 100, rear floor body; 200, rear floor rear side beam; 300, rear energy absorber; 400, rear anti-collision beam; 500, front floor frame; 510, sill beam; 511, third hollow tube; 512, upper middle rib; 513, lower middle rib; 514, third reinforcing rib; 515, fourth reinforcing rib; 520, front seat front cross beam; 521, front cross beam joint; 530, sled plate; 531, sled bottom plate; 5311, first protrusion; 532, sled convex plate; 540, central tunnel; 541, tunnel bottom plate; 542, tunnel convex plate; 5421, second protrusion; 550, front seat rear cross beam; 551, rear cross beam joint; 560, front floor sealing pressing plate; 600, battery pack; 700, front cabin frame; 710, front anti-collision beam; 720, front energy absorber; 730, front longitudinal beam; 731, front longitudinal beam bottom plate; 732, front longitudinal beam convex plate; 740, upper side beam; 750, tower base; 751, A-pillar assembly; 760, tower base strut; 770, front wall upper cross beam; 780, front wall middle cross beam; 790, front wall lower cross beam. Detailed implementation manners

[0036] In order to make the technical problems, technical solutions and beneficial effects solved by the present utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present utility model and are not used to limit the present utility model.

[0037] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by the terms "longitudinal", "radial", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present utility model. In the description of the present utility model, unless otherwise specified, the meaning of "a plurality of" is two or more than two.

[0038] In the description of the present utility model, it should be noted that, unless otherwise clearly defined and limited, the terms "mounted", "connected" and "coupled" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0039] Figure 1 is a schematic structural diagram of a lower body frame in an embodiment of the present utility model, as Figure 1 shown, and with reference to Figures 2 to 13 , the embodiment of the present utility model provides a lower body frame, including a front cabin frame and a front floor frame connected to the front cabin frame. The front floor frame 500 includes sill beams 510, sled plates 530, a central tunnel 540, a front seat rear cross beam 550, and a front floor sealing pressing plate 560. The two sill beams 510 extend along the longitudinal direction of the vehicle body and are arranged at intervals; the front seat front cross beam and the front seat rear cross beam are arranged at intervals along the longitudinal direction of the vehicle body, and both ends of the front seat front cross beam and the front seat rear cross beam are respectively connected to the two sill beams;

[0040] both ends of the central tunnel are respectively connected to the rear end of the front cabin frame and the front seat front cross beam; the number of the sled plates is two, and the two sled plates are respectively arranged on both sides of the central tunnel, and both ends of the sled plates are respectively connected to the rear end of the front cabin frame and the front seat front cross beam;

[0041] The sill beam 510 includes a fourth hollow tube 511, an upper-middle reinforcement 512 and a lower-middle reinforcement 513 disposed within the fourth hollow tube 511. The upper-middle reinforcement 512 and the lower-middle reinforcement 513 are spaced apart in the vertical direction to divide the fourth hollow tube 511 into an upper cavity, a middle cavity and a lower cavity. The lower-middle reinforcement 513 is horizontally disposed, and one end of the lower-middle reinforcement 513 close to the front seat front cross member / the front seat rear cross member is higher than the end away from the front seat front cross member 520.

[0042] In the embodiment of the present invention, since the central tunnel 540 and the sled plate 530 are disposed between the rear end of the front cabin frame and the front seat front cross member, they receive and transmit the energy from the frontal collision and the offset collision, and at the same time greatly improve the bending performance. Moreover, since both ends of the front seat front cross member are connected to the sill beam 510, the forces on the central tunnel 540 and the sled plate 530 can be received and decomposed onto the front seat rear mounting cross member and transmitted to the sill beam 510, forming five longitudinal force transmission paths, thereby dispersing and transmitting the energy of the frontal collision backward and improving the overall force transmission performance.

[0043] Furthermore, the upper-middle reinforcement 512 can normally transmit the force received during a side column collision in the horizontal direction, avoiding deformation of the vehicle body during a side collision. The inclined setting of the lower-middle reinforcement 513 can transmit the force to the front seat front cross member / the front seat rear cross member, and then to the vehicle body, reducing the force on the lower part of the sill beam 510 and avoiding affecting the battery pack 600.

[0044] In an embodiment of the present invention, the sill beam 510 further includes a third reinforcement 514 and a fourth reinforcement 515. The third reinforcement 514 intersects with the upper-middle reinforcement 512 and the lower-middle reinforcement 513, and the fourth reinforcement 515 is connected to the top wall of the fourth hollow tube 511 and the lower-middle reinforcement 513. The third reinforcement 514 is located on the side of the fourth reinforcement 515 away from the front seat front cross member 520. The settings of the third reinforcement 514 and the fourth reinforcement 515 enable the sill beam 510 to form an octagonal grid structure, further enhancing the strength of the sill beam 510 for transmitting force to the vehicle body. Moreover, the upper cavity and the middle cavity are both divided into three grids, and the lower cavity is divided into two grids. The larger grid of the lower cavity provides a mounting point for the battery pack 600.

[0045] In an embodiment of the present utility model, the rear crossbeam 550 of the front seat is arranged at an interval from the front crossbeam 520 of the front seat. Both ends of the rear crossbeam 550 of the front seat are respectively connected to two sill beams 510 to form a transverse double-channel force transmission. Among them, the front crossbeam 520 of the front seat is connected to the sill beam 510 through a front crossbeam joint 521, and the rear crossbeam 550 of the seat is connected to the two sill beams 510 through a rear crossbeam joint 551. When the occupant compartment is subjected to a lateral side column collision, the force is mainly transmitted from the deformation of the sill beam 510 to the front crossbeam joint 521 and the rear crossbeam joint 551, and then transmitted to the sill beam 510 on the other side through the front crossbeam 520 of the front seat and the rear crossbeam 550 of the front seat, realizing double-channel force transmission. Among them, the materials of the front crossbeam joint 521 and the rear crossbeam joint 551 are high-strength steel. The front crossbeam 520 of the front seat is a constant cross-section pipe structure, and it is provided with reinforcing ribs inside; the rear crossbeam 550 of the front seat is a constant cross-section pipe structure, and it is provided with reinforcing ribs inside. Specifically, the front crossbeam 520 of the front seat is a constant cross-section extrusion part with a "day" - shaped cross-section in the transverse direction, and its length can be adjusted according to requirements. The rear crossbeam 550 of the front seat is a constant cross-section extrusion part with an "eye" - shaped cross-section in the transverse direction, and its length can be adjusted according to requirements. Moreover, both the front crossbeam 520 of the front seat and the rear crossbeam 550 of the front seat are extrusion aluminum structural parts.

[0046] The front and rear ends of the front floor sealing pressing plate 560 are respectively connected to the lower crossbeam 790 of the front wall panel and the rear floor body 100, and the left and right ends are respectively connected to the sill beams 510 on both sides. It is an integrally formed sealing pressing plate, mainly ensuring the flatness of the large sealing surface. The front floor sealing pressing plate 560 is integrally formed or formed by laser tailor welding. The upper side of the battery pack 600 is connected to the front floor sealing pressing plate 560, and both ends of the battery pack 600 are connected to the sill beams 510. The front floor sealing pressing plate 560 can form a complete sealing effect with the battery pack 600 and the sealing foam, thereby realizing the CTB structure of the large surface of the front floor panel without a front floor panel.

[0047] In an embodiment of the present utility model, as Figure 5As shown in the figure, the front cabin frame 700 includes a front anti-collision beam 710, a front energy-absorbing box 720, front longitudinal beams 730, upper side beams 740, tower bases 750, tower base braces 760, an upper cross beam 770 of the front wall panel, a middle cross beam 780 of the front wall panel, and a lower cross beam 790 of the front wall panel. In the front cabin frame 700, the number of the front energy-absorbing boxes 720, the front longitudinal beams 730, the upper side beams 740, and the tower bases 750 is two, and they are symmetrically arranged about the front anti-collision beam 710. The front energy-absorbing box 720 is connected to the rear side of the front anti-collision beam 710, and the front end of the front longitudinal beam 730 is connected to the inner end of the rear side of the front energy-absorbing box 720, forming a first force transmission structure. The front end of the upper side beam 740 is located outside the front longitudinal beam 730 and is connected to the outer end of the rear side of the front energy-absorbing box 720, forming a second force transmission structure. The upper side beam 740 is located above the front longitudinal beam 730, forming a force structure transmission path with two channels and four paths. The length of the front energy-absorbing box is 270 mm to 400 mm. Specifically, the length of the front energy-absorbing box is any point value among 270 mm, 280 mm, 290 mm, 300 mm, 310 mm, 320 mm, 330 mm, 340 mm, 350 mm, 360 mm, 370 mm, 380 mm, 390 mm, or 400 mm, or a range value composed of any two point values; the length of the front energy-absorbing box can be specifically set according to the requirements of different vehicle models to adapt to the application of multiple vehicle models in a platform.

[0048] Among them, as Figure 7 shown, the front energy-absorbing box includes a fifth hollow tube and a fifth reinforcing rib arranged in the fifth hollow tube. The fifth reinforcing rib connects two opposite side walls of the fifth hollow tube, and the fifth reinforcing rib extends along the length direction of the fifth hollow tube. Specifically, the front energy-absorbing box 720 is an equal-section extrusion part with a cross-section in the shape of a "day", and its length can be adjusted according to requirements. At the same time, the energy-absorbing box is an extrusion aluminum structural part. There are two energy-absorbing ribs on each side of the front of the energy-absorbing box, so that the front energy-absorbing box 720 has good induced collapse energy absorption. The middle and rear parts of the front energy-absorbing box 720 are standard sections, and the length of the front energy-absorbing box 720 is 270 mm to 400 mm. The front section of the front longitudinal beam 730 is a closed "mouth"-shaped high-strength steel combined welded part. The front section of the front longitudinal beam 730 is a bending area, mainly resisting deformation to ensure the engine compartment; further, an extrusion aluminum profile can be used, and the material thickness and strength should be higher than those of high-strength steel to replace high-strength steel to prepare the front longitudinal beam 730, so as to ensure that the bending energy absorption of the front longitudinal beam 730 is later than the collapse energy absorption of the front energy-absorbing box 720.

[0049] Further, as Figure 11As shown in the figure, the front longitudinal beam 730 includes a front longitudinal beam bottom plate 731 and a front longitudinal beam convex plate 732. The two sides of the front longitudinal beam bottom plate 731 are connected to the two sides of the front longitudinal beam convex plate 732. The middle part of the front longitudinal beam convex plate 732 bulges in the direction away from the front longitudinal beam bottom plate 731 to form a hollow structure, so as to reduce the weight of the front longitudinal beam 730. The front longitudinal beam convex plate 732 is connected to other components.

[0050] In an embodiment of the present utility model, the tower base 750 is connected between the upper side beam 740 and the front longitudinal beam 730. The two tower bases 750 are connected by a tower base strut 760 to improve the overall torsional performance of the vehicle body. The tower base strut 760 is a tubular strut with a circular tube in the middle and elliptical tubes at both ends, or the tower base strut 760 can also be an extruded aluminum in the shape of a square or a rectangle.

[0051] In an embodiment of the present utility model, the two ends of the upper front wall beam 770, the middle front wall beam 780 and the lower front wall beam 790 are respectively connected to the A-pillar assembly 751. The upper front wall beam 770 is arranged horizontally along the vehicle body at the top of the front wall, the middle front wall beam 780 is arranged horizontally along the vehicle body in the middle of the front wall, and the lower front wall beam 790 is arranged horizontally along the vehicle body at the bottom of the front wall. Among them, the upper front wall beam 770 and the middle front wall beam 780 are bow-shaped arcs, which can better improve the bending and torsional resistance of the front wall, and at the same time can better resist the frontal force and transmit the force to the A-pillar assembly 751. The lower front wall beam 790 is a multi-chamber extruded aluminum structural member, which greatly improves the overall torsional stiffness, can provide an effective lateral support, and is connected to the left and right tower bases 750.

[0052] As Figure 6 、 Figure 12 shown, in an embodiment of the present utility model, the front floor frame 500 further includes a front floor sealing pressing plate 560. The sill beam 510 is connected to the A-pillar assembly 751; the front end of the central tunnel 540 is connected to the lower front wall beam 790, and the rear end is connected to the front seat front cross beam 520; there are two sled plates 530, which are distributed on both sides of the central tunnel 540. The front end of the sled plate 530 is connected to the lower front wall beam 790, and the rear end is connected to the front seat front cross beam 520. The settings of the sill beam 510, the central tunnel 540 and the sled plates 530 form five longitudinal force transmission paths, and the multi-channel forces are dispersed and transmitted backward to ensure the integrity of the occupant compartment and the safety of the occupants. Among them, both the sled plate 530 and the central tunnel 540 are hot-formed high-strength steel. Using the strength of high-strength steel, the survival space of the occupant compartment is guaranteed as much as possible.

[0053] Furthermore, as Figure 10As shown, the sled board 530 includes a sled bottom board 531 and a sled convex board 532. The two sides of the sled bottom board 531 are connected to the two sides of the sled convex board 532. The middle part of the sled convex board 532 protrudes in a direction away from the sled bottom board 531 to form a hollow structure, so as to reduce the weight of the sled board 530. A first protrusion 5311 extending into the hollow structure is formed on the sled bottom board 531 to increase the mechanical strength of the sled board 530. As Figure 13 shown, the central channel 540 includes a channel bottom board 541 and a channel convex board 542. The two sides of the channel bottom board 541 are connected to the two sides of the channel convex board 542. The middle part of the channel convex board 542 protrudes in a direction away from the channel bottom board 541 to form a hollow structure, so as to reduce the weight of the central channel 540. A second protrusion 5421 extending into the hollow structure is formed on the channel convex board 542 to increase the mechanical strength of the central channel 540.

[0054] As Figure 1 , Figure 2 shown, in an embodiment of the present invention, the lower vehicle body frame further includes a rear floor frame, and the rear floor frame is connected to the front floor frame; the rear floor frame includes a rear floor body 100, a rear floor rear side beam 200, a rear energy absorption box 300 and a rear anti-collision beam 400. The rear end of the rear energy absorption box 300 is fixedly connected to the rear anti-collision beam 400, and the front end is connected to the rear floor rear side beam 200. The rear floor rear side beam 200 is connected to the rear floor body 100; the upper end surface of the rear energy absorption box 300 is not higher than the upper end surface of the rear floor rear side beam 200 by 20 mm.

[0055] In the embodiment of the present invention, since the rear floor rear side beam 200 and the rear energy absorption box 300 are arranged between the rear floor body 100 and the rear anti-collision beam 400, and the upper end surface of the rear energy absorption box 300 is not higher than the upper end surface of the rear floor rear side beam 200 by 20 mm, so as to transmit force to the rear floor rear side beam 200. The rear floor rear side beam 200 can transmit force at a low speed and collapse and absorb energy at a high speed during a rear collision, so as to minimize the damage to the rear floor body 100 caused by the rear collision and reduce the injury to passengers in a rear-end collision.

[0056] Preferably, the orthographic projection of the rear energy absorption box 300 on the rear floor rear side beam 200 is entirely located on the rear floor rear side beam 200, so that the rear energy absorption box 300 can transmit force to the rear floor rear side beam 200 better.

[0057] If, during a rear collision, the rear floor rear side beam 200 rises and disengages, it is not conducive to the force transmission of the rear floor rear side beam 200 and the high-speed crush energy absorption. In severe cases, it may even rise and stab the rear row passengers. Based on this, in an embodiment of the present utility model, the rear end of the rear floor body 100 is lapped above the rear floor rear side beam 200, so that the rear floor body 100 presses on the rear floor rear side beam 200, preventing the rear floor rear side beam 200 from rising and disengaging.

[0058] In an embodiment of the present utility model, the number of the rear energy absorption boxes 300 is two, which are respectively arranged at both ends of the rear anti-collision beam 400; the rear floor rear side beam 200 and the rear energy absorption boxes 300 are arranged in one-to-one correspondence.

[0059] As Figure 9 shown, in an embodiment of the present utility model, the rear floor rear side beam 200 includes a first hollow tube and at least one first reinforcing rib arranged inside the first hollow tube. The first reinforcing rib connects two opposite side walls of the first hollow tube, and the first reinforcing rib extends along the length direction of the first hollow tube; that is to say, the cross-section of the rear floor rear side beam 200 is in a horizontal or vertical "day" - shaped structure, and the cross-section is 105 mm × 105 mm. Specifically, the rear floor rear side beam 200 is formed by extrusion of aluminum.

[0060] The rear anti-collision beam 400 includes a second hollow tube and a second reinforcing rib arranged inside the second hollow tube. The second reinforcing rib connects two opposite side walls of the second hollow tube, and the second reinforcing rib extends along the length direction of the second hollow tube; that is to say, the cross-section of the rear anti-collision beam 400 is in a horizontal or vertical "day" - shaped structure.

[0061] As Figure 8 shown, the rear energy absorption box 300 includes a third hollow tube, and the axial direction of the third hollow tube is parallel to the axial direction of the first hollow tube. That is to say, the cross-section of the rear energy absorption box 300 is in a "square" - shaped structure. The cross-section of the rear energy absorption box 300 is 88 mm × 88 mm. Specifically, the rear energy absorption box 300 is formed by extrusion of aluminum.

[0062] As Figure 2 shown, the present utility model also provides a lower vehicle body frame, which includes a front cabin frame 700, a front floor frame 500 and the rear floor frame as described in any one of the above, so as to have all the effects of the rear floor frame; the front cabin frame 700, the front floor frame 500 and the rear floor frame are sequentially connected.

[0063] In one embodiment of the utility model, the front floor frame 500 includes two parallel threshold beams 510, the rear ends of the threshold beams 510 are connected to the rear floor body 100; a front seat front cross beam 520 is connected between the two threshold beams 510; the side walls of the threshold beam 510 are connected to the front seat front cross beam 520, and the bottom wall of the threshold beam 510 is used to connect the battery pack 600.

[0064] like Figure 3 , Figure 4 As shown, in one embodiment of the utility model, the threshold beam 510 includes a fourth hollow tube 511 and an upper middle rib 512 and a lower middle rib 513 arranged in the fourth hollow tube 511, the upper middle rib 512 and the lower middle rib 513 are arranged at intervals in the vertical direction to separate the fourth hollow tube 511 into an upper cavity, a middle cavity and a lower cavity, the lower middle rib 513 is arranged horizontally, and one end of the lower middle rib 513 close to the front cross beam of the front seat / the rear cross beam of the front seat is higher than the end away from the front cross beam 520 of the front seat.

[0065] In the embodiment of the utility model, the middle upper rib 512 can normally transmit the force received by the side pillar in the horizontal direction, thereby preventing the vehicle body from being deformed in the side collision. The middle lower rib 513 is arranged obliquely, thereby transmitting the force to the front cross beam of the front seat / the rear cross beam of the front seat, and then to the vehicle body, thereby reducing the force received by the lower part of the door sill beam 510 and avoiding affecting the battery pack 600.

[0066] Furthermore, the threshold beam 510 further includes a third reinforcing rib 514 and a fourth reinforcing rib 515. The third reinforcing rib 514 is arranged crosswise with the middle upper rib 512 and the middle lower rib 513. The fourth reinforcing rib 515 is connected to the top wall of the fourth hollow tube 511 and the middle lower rib 513. The third reinforcing rib 514 is located on the side of the fourth reinforcing rib 515 away from the front cross beam 520 of the front seat. The arrangement of the third reinforcing rib 514 and the fourth reinforcing rib 515 enables the threshold beam 510 to form an eight-grid structure, further enhancing the strength of the threshold beam 510 so as to transmit force to the vehicle body. In addition, the upper cavity and the middle cavity are both three grids, and the lower cavity is two grids. The larger grid of the lower cavity provides a mounting point for the battery pack 600.

[0067] In one embodiment of the utility model, the above components are mainly connected by SPR, FDS, riveting or bolts, and aluminum burning connection is adopted when they are partially constrained by welding guns or space; and structural adhesive is applied at the connection positions of dissimilar metal brackets and the overlap positions of aluminum alloy to achieve the effect of fixing and sealing.

[0068] The utility model also provides a car, comprising a lower vehicle body frame as described in any one of the above items, so as to have all the effects of the lower vehicle body frame.

[0069] The above-described embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the various embodiments of the present invention, and should all be included within the protection scope of the present invention.

Claims

1. A lower body frame, characterized in that, It includes a front cabin frame and a front floor frame connected to the front cabin frame. The front floor frame includes a front seat front crossbeam, a front seat rear crossbeam, a central tunnel, sled plates, and two sill beams. The two sill beams extend along the longitudinal direction of the vehicle body and are spaced apart; the front seat front crossbeam and the front seat rear crossbeam are spaced apart along the longitudinal direction of the vehicle body, and both ends of the front seat front crossbeam and the front seat rear crossbeam are respectively connected to the two sill beams; Both ends of the central tunnel are respectively connected to the rear end of the front cabin frame and the front seat front crossbeam; there are two sled plates, and the two sled plates are respectively arranged on both sides of the central tunnel, and both ends of the sled plates are respectively connected to the rear end of the front cabin frame and the front seat front crossbeam; The sill beam includes a fourth hollow tube and an upper middle rib and a lower middle rib arranged in the fourth hollow tube. The upper middle rib and the lower middle rib are spaced apart in the vertical direction to divide the fourth hollow tube into an upper cavity, a middle cavity, and a lower cavity. The lower middle rib is horizontally arranged, and one end of the lower middle rib close to the front seat front crossbeam and / or the front seat rear crossbeam is higher than the end away from the front seat front crossbeam.

2. The underbody frame according to claim 1, wherein, The sill beam further includes a third reinforcing rib and a fourth reinforcing rib. The third reinforcing rib intersects with the upper middle rib and the lower middle rib, and the fourth reinforcing rib is connected to the top wall of the fourth hollow tube and the lower middle rib; the third reinforcing rib is located on the side of the fourth reinforcing rib away from the front seat front crossbeam.

3. The underbody frame according to claim 2, wherein, The front seat front crossbeam is a constant cross-section pipe fitting structure, and reinforcing ribs are arranged inside it; The front seat rear crossbeam is a constant cross-section pipe fitting structure, and reinforcing ribs are arranged inside it.

4. The underbody frame according to claim 3, wherein, The front floor frame further includes a front floor sealing pressing plate. The front end of the front floor sealing pressing plate is connected to the front cabin frame, and the left and right ends are respectively connected to the two sill beams on both sides; the bottom walls of the front floor sealing pressing plate and the sill beam are both used to connect the battery pack.

5. The underbody frame according to claim 1, wherein, The front cabin frame includes a front anti-collision beam and a front energy absorption box. The front energy absorption box includes a fifth hollow tube and a fifth reinforcing rib arranged in the fifth hollow tube. The fifth reinforcing rib connects two opposite side walls of the fifth hollow tube, and the fifth reinforcing rib extends along the length direction of the fifth hollow tube; the length of the front energy absorption box is 270 mm to 400 mm.

6. The underbody frame according to claim 1, wherein, The front cabin frame includes an A-pillar assembly, an upper front wall crossbeam, a middle front wall crossbeam, and a lower front wall crossbeam. The upper front wall crossbeam, the middle front wall crossbeam, and the lower front wall crossbeam are connected to the A-pillar assembly; both ends of the central tunnel and the sled plates are respectively connected to the lower front wall crossbeam and the front seat front crossbeam.

7. The underbody frame according to claim 1, wherein, The lower body frame further includes a rear floor frame, and the rear floor frame is connected to the front floor frame; The rear floor frame includes a rear floor body, rear floor rear side beams, rear energy absorbing boxes, and rear anti-collision beams. The rear end of the rear energy absorbing box is fixedly connected to the rear anti-collision beam, and the front end is connected to the rear floor rear side beams. The rear floor rear side beams are connected to the rear floor body.

8. The lower body frame according to claim 7, wherein the rear floor rear side beam includes a first hollow tube and at least one first reinforcing rib disposed within the first hollow tube. The first reinforcing rib connects two opposite side walls of the first hollow tube, and the first reinforcing rib extends along the length direction of the first hollow tube; the rear anti-collision beam includes a second hollow tube and a second reinforcing rib disposed within the second hollow tube. The second reinforcing rib connects two opposite side walls of the second hollow tube, and the second reinforcing rib extends along the length direction of the second hollow tube; the rear energy absorbing box includes a third hollow tube, and the axial direction of the third hollow tube is parallel to the axial direction of the first hollow tube.

9. A vehicle, characterized in that, including the lower body frame according to any one of claims 1 to 8.

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