Automobile body and automobile

Abstract

The application provides a car body and a car, and the car body of the car comprises a rear floor lower cross beam located at the bottom of a rear floor assembly, a rocker located at left and right sides, and a torsion box connected to the rear end of the left and right front engine compartment longitudinal beams respectively; the rear floor lower cross beam is in a "C" shape with an opening facing forward, and the left and right sides of the rear floor lower cross beam are connected to the rear end of the corresponding rocker respectively; each side torsion box is connected to the front end of the same side rocker, and the two side torsion boxes are connected by an engine compartment rear section cross beam; the rear floor lower cross beam, the engine compartment rear section cross beam, and the left and right rockers and torsion boxes are connected to form a ring structure. The car body of the application can increase the strength and rigidity of the front part of the rear floor assembly, improve the structural strength and torsional rigidity of the bottom of the car body, form a ring force transmission channel at the bottom of the car body, help to disperse the collision force, and improve the collision safety of the whole car.

Description

Technical Field

[0001] This invention relates to the field of automotive body technology, and particularly to an automotive body. The invention also relates to an automotive body equipped with the aforementioned body. Background Technology

[0002] With the continuous development of automotive technology and the increasing attention people pay to vehicle safety, the structural strength and torsional stiffness of the car body, as well as its performance in transmitting collision forces during a crash, have become increasingly important. However, in current car body structures, especially at the bottom, the front engine compartment and rear floor assembly are typically connected only by side sill beams. This not only limits the improvement of torsional stiffness but also hinders the effective transmission of collision forces, thus negatively impacting overall vehicle crash safety. Summary of the Invention

[0003] In view of this, the present invention aims to provide a car body that can improve the structural strength and torsional stiffness of the bottom of the car body, and also facilitate the transmission and dispersion of collision forces.

[0004] To achieve the above objectives, the technical solution of the present invention is implemented as follows:

[0005] A car body includes a rear floor lower crossbeam located at the bottom of the rear floor assembly, sill beams on the left and right sides respectively, and torsion boxes connected to the rear ends of the longitudinal beams of the left and right front engine compartment respectively.

[0006] The lower crossbeam of the rear floor is in the shape of a "C" with the opening facing forward, and the left and right sides of the lower crossbeam of the rear floor are respectively connected to the rear end of the sill beam on the corresponding side; the torsion box on each side is connected to the front end of the sill beam on the same side, and the rear crossbeam of the engine compartment is connected between the torsion boxes on both sides.

[0007] The lower crossbeam of the rear floor, the rear crossbeam of the cabin, the sill beams on both sides, and the torsion box are connected to form a ring structure.

[0008] Furthermore, the rear floor assembly has a rear floor frame and a rear floor panel covering the rear floor frame; the rear floor frame has rear floor longitudinal beams on both sides and a rear floor middle crossbeam connecting the rear floor longitudinal beams on both sides; the rear floor longitudinal beams on each side are connected to the rear end of the sill beam on the same side, and the lower rear floor crossbeam is connected between the front section of the rear floor longitudinal beams on both sides and the rear floor middle crossbeam.

[0009] Furthermore, the rear floor frame also has a rear floor front crossbeam; the rear floor front crossbeam is connected between the front sections of the rear floor longitudinal beams on both sides, and the rear floor front crossbeam, the rear floor middle crossbeam and the rear floor longitudinal beams on both sides are connected to form a ring structure.

[0010] Furthermore, the rear floor frame also has a rear floor crossbeam; the rear floor crossbeam is connected between the rear sections of the rear floor longitudinal beams on both sides, and the rear floor middle crossbeam is connected in the transition area between the front and rear sections of the rear floor longitudinal beams on each side; the rear floor crossbeam, the rear floor middle crossbeam, and the rear floor longitudinal beams on both sides are connected to form a ring structure.

[0011] Furthermore, each of the two sill beams has a rear sill beam at its rear end, and each rear sill beam is connected to the rear floor longitudinal beam; a longitudinal beam front section cavity is formed between the front section, the rear sill beam and the rear floor panel on each side, and a lower crossbeam side cavity is formed between the front section, the rear sill beam and the lower crossbeam of the rear floor on each side.

[0012] The front section cavity of the longitudinal beam and the side cavity of the lower crossbeam are stacked in the vertical direction of the entire vehicle.

[0013] Furthermore, a middle crossbeam cavity is formed between the middle crossbeam of the rear floor and the rear floor panel; a lower crossbeam middle cavity is formed between the lower crossbeam of the rear floor and the middle crossbeam of the rear floor; the middle crossbeam cavity and the lower crossbeam middle cavity are stacked in the vertical direction of the entire vehicle.

[0014] Furthermore, it also includes a battery pack; the front end of the battery pack is connected to the rear section crossbeam of the cabin and the torsion boxes on both sides, the left and right sides of the battery pack are respectively connected to the sill beams on the corresponding sides, and the rear end of the battery pack is connected to the lower crossbeam of the rear floor.

[0015] Furthermore, sealing rings are provided between the top of the battery pack and the lower crossbeam of the rear floor, the rear crossbeam of the cabin, the sill beams on both sides, and the torsion box;

[0016] The top of the battery pack forms a front floor panel located between the two sill beams on both sides, and a rear floor front panel located in front of the lower crossbeam of the rear floor.

[0017] Furthermore, a front seat mounting beam is connected between the two sill beams;

[0018] The front seat mounting beams include front mounting beams and rear mounting beams spaced apart along the front-rear direction of the vehicle.

[0019] Both the front mounting beam and the rear mounting beam are connected by the sill beam on one side to the sill beam on the other side, and the middle part of the battery pack is connected to both the front mounting beam and the rear mounting beam.

[0020] Further, both the front mounting cross beam and the rear mounting cross beam are formed by a roll-forming process;

[0021] Both the front mounting cross beam and the rear mounting cross beam have a plurality of cross beam bodies connected in sequence in the front-rear direction of the vehicle, and the cross section of each cross beam body is in a "U" shape;

[0022] The connection points of both the front mounting cross beam and the rear mounting cross beam with the battery pack are located between two adjacent cross beam bodies;

[0023] Further, mounting through holes are provided on both the side sill beams, and nut plates corresponding to the mounting through holes;

[0024] The mounting through holes are long holes extending in the left-right direction of the vehicle. The nut plate has a bottom plate and welding nuts provided on the bottom plate. The battery pack is connected to the welding nuts through connecting bolts passing through the mounting through holes;

[0025] A crush plate is connected to the bottom plate through a deformable connecting portion. The welding nuts are connected to the crush plate, and when the connecting portion is deformed, the welding nuts can move relative to the bottom plate along the length direction of the mounting through hole;

[0026] Further, through holes are provided on the bottom plate. The crush plate is located within the through holes, and between the two ends of the crush plate in the length direction of the mounting through hole, one end is connected to the bottom plate through the connecting portion, and a crush deformation space is formed between the other end and the inner wall of the through hole; and / or,

[0027] The connecting portion adopts a bent connecting plate.

[0028] Compared with the prior art, the present invention has the following advantages:

[0029] For the vehicle body of the present invention, by providing the lower rear floor cross beam in a "C" shape, the torsion boxes on both sides are connected through the rear section of the engine compartment cross beam, and the lower rear floor cross beam, the rear section of the engine compartment cross beam, and the side sill beams and torsion boxes on both sides are connected to form a ring structure. Not only can the characteristics of the large strength of the ring structure be utilized to improve the structural strength and torsional stiffness of the vehicle body bottom, but also a ring-shaped force transmission channel can be formed at the vehicle body bottom, which helps to transmit and disperse the collision force, thereby being beneficial to improving the collision safety of the whole vehicle.

[0030] Furthermore, the lower crossbeam of the rear floor connects the front sections of the longitudinal beams on both sides of the rear floor and the middle crossbeam of the rear floor, increasing the strength and rigidity of the front part of the rear floor assembly, improving the stability of the rear battery pack or fuel tank installation, and also increasing the structural strength of the rear floor frame, thereby improving the overall torsional rigidity of the rear floor assembly. By setting a front crossbeam for the rear floor and connecting the front crossbeam, the middle crossbeam, and the longitudinal beams on both sides of the rear floor to form a ring structure, the structural strength of the rear floor frame can be further improved by utilizing the high strength of the ring structure. By setting a rear crossbeam for the rear floor and connecting the rear crossbeam, the middle crossbeam, and the longitudinal beams on both sides of the rear floor to form a ring structure, the rigidity of the rear floor frame can be further improved by utilizing a double-ring structure based on the ring mechanism formed by the front crossbeam.

[0031] By forming a front section cavity of the longitudinal beam and a side cavity of the lower crossbeam stacked vertically, a dual-cavity structure can be used to increase the structural strength of the front two sides of the rear floor assembly. Similarly, by forming a middle crossbeam cavity and a middle cavity of the lower crossbeam stacked vertically, a dual-cavity structure can also be used to increase the structural strength of the middle front section of the rear floor assembly. Furthermore, this dual-cavity structure, in conjunction with the dual-cavity structures on both sides, can improve the dynamic stiffness of the front mounting point of the rear subframe and enhance the rear-end collision performance of the vehicle.

[0032] Secondly, the battery pack is connected to each beam and torsion box for installation within the vehicle body. This not only allows for the battery pack's placement within the vehicle but also improves installation reliability by utilizing the ring structure formed by the beams and torsion box. The top of the battery pack forms the front floor panel and the front panel of the rear floor, eliminating the need for existing front and rear floor panels. This integrates the battery pack with the vehicle body, reducing the number of body parts and contributing to lightweight design and lower manufacturing costs. Sealing rings are installed between the top of the battery pack and the beams and torsion box to ensure the vehicle's internal sealing.

[0033] The front seat mounting beams feature a continuous structure, ensuring the continuity of the force transmission channels formed by the beams and improving side-impact force transmission. The battery pack connects to each front seat mounting beam in the middle, enhancing the stability of the battery pack within the vehicle body. The front seat mounting beams are formed using a roll forming process, consisting of multiple beams with a Z-shaped cross-section. This increases the structural strength of the beams themselves, contributing to the stability of the front seats and battery pack, while also improving the torsional stiffness of the vehicle's midsection and the impact force transmission effect of the front seat mounting beams.

[0034] Furthermore, the battery pack mounting point at the sill beam consists of a long, narrow mounting hole and a nut plate with a base plate and a welded nut. The welded nut can move relative to the base plate along the length of the mounting hole, enabling collapsible displacement of the battery pack mounting point in the event of a side impact. This helps reduce the impact on the battery pack and improves its safety. A collapsible plate is located within a through hole in the base plate, with one end connected to the base plate via a connector, and the other end forming a crushing deformation space. This simplifies the nut plate structure and limits the movement distance of the welded nut, ensuring effective use when the nut plate collapses. The connector uses a curved connecting plate, which is simple in structure, easy to manufacture, and has good collapsible deformation properties.

[0035] Another object of the present invention is to provide an automobile having a body as described above.

[0036] The automobile described in this invention has the same beneficial effects as the automobile body described above, and will not be repeated here. Attached Figure Description

[0037] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:

[0038] Figure 1 This is a schematic diagram of the vehicle body structure according to an embodiment of the present invention;

[0039] Figure 2 for Figure 1 A schematic diagram of the structure shown from the bottom view;

[0040] Figure 3 This is a schematic diagram of the rear floor assembly according to an embodiment of the present invention;

[0041] Figure 4 for Figure 3 A schematic diagram of the structure shown from the bottom view;

[0042] Figure 5 This is a schematic diagram of the structure of the rear floor frame according to an embodiment of the present invention;

[0043] Figure 6 for Figure 5 A schematic diagram of the structure shown from the bottom view;

[0044] Figure 7 This is a schematic diagram of the structure of the lower crossbeam of the rear floor as described in an embodiment of the present invention;

[0045] Figure 8 This is a schematic diagram illustrating the structure of the front section cavity of the longitudinal beam and the side cavity of the lower crossbeam according to an embodiment of the present invention;

[0046] Figure 9 This is a schematic diagram illustrating the structure of the middle crossbeam cavity and the middle cavity of the lower crossbeam according to an embodiment of the present invention;

[0047] Figure 10 This is a schematic diagram of the front seat mounting beam according to an embodiment of the present invention;

[0048] Figure 11 for Figure 6 A magnified view of part A in the middle;

[0049] Figure 12 This is a schematic diagram of the nut plate according to an embodiment of the present invention;

[0050] Figure 13 This is a schematic diagram of the structure of the base plate according to an embodiment of the present invention;

[0051] Figure 14 This is a schematic diagram of the collision force transmission of the vehicle body according to an embodiment of the present invention;

[0052] Explanation of reference numerals in the attached figures:

[0053] 1. Rear floor assembly; 2. Sill beam; 3. Front floor panel; 4. Front engine compartment longitudinal beam; 5. Front seat mounting beam; 6. Lower rear floor beam; 7. Torque box; 8. Rear engine compartment beam; 9. Nut plate;

[0054] 100. Rear floor frame; 200. Rear floor panel; 300. Rear floor front crossbeam reinforcement plate; 200a. Longitudinal beam cover plate; 200b. Rear floor front panel;

[0055] 101. Rear floor longitudinal beam; 101a. Front section; 101b. Rear section; 102. Rear floor middle crossbeam; 103. Rear floor front crossbeam; 104. Rear floor rear crossbeam;

[0056] 2a. Rear door sill beam; 201. Mounting through hole; 501. Front mounting crossbeam; 502. Rear mounting crossbeam; 5a. Crossbeam body; 6a. Side of lower crossbeam; 6b. Middle of lower crossbeam; 901. Base plate; 901a. Collapsible plate; 901b. Connecting part; 901c. Through hole; 902. Welded nut;

[0057] M, front section cavity of the longitudinal beam; N, side cavity of the lower crossbeam; S, cavity of the middle crossbeam; T, middle cavity of the lower crossbeam;

[0058] k. Crushing deformation zone. Detailed Implementation

[0059] It should be noted that, unless otherwise specified, the embodiments and features described in the present invention can be combined with each other.

[0060] In the description of this invention, it should be noted that the use of terms such as "upper," "lower," "inner," and "outer," indicating orientation or positional relationship, is based on the orientation or positional relationship shown in the accompanying drawings and is only for the convenience of describing the invention and simplifying the description. It does not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, the use of terms such as "first" and "second" is also for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0061] Furthermore, in the description of this invention, unless otherwise explicitly specified, the connecting structures between mating components can be conventional in the art. Moreover, the terms "installation," "connection," "joining," and "connector" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention in light of the specific circumstances.

[0062] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0063] Example 1

[0064] This embodiment relates to a car body, combined with Figure 1 and Figure 2 As shown, it includes a rear floor lower crossbeam 6 located at the bottom of the rear floor assembly 1, sill beams 2 located on the left and right sides respectively, and torsion boxes 7 connected to the rear ends of the front engine compartment longitudinal beams 4 on the left and right sides respectively.

[0065] The rear floor lower crossbeam 6 is C-shaped with its opening facing forward, and its left and right sides are connected to the rear ends of the corresponding side sill beams 2. Each side torsion box 7 is connected to the front end of the sill beam 2 on the same side, and the rear section crossbeam 8 of the cabin is connected between the two torsion boxes 7. Simultaneously, the rear floor lower crossbeam 6, the rear section crossbeam 8 of the cabin, and the sill beams 2 and torsion boxes 7 on both sides are connected to form a ring structure.

[0066] At this time, by setting a "C"-shaped lower crossbeam 6 of the rear floor, the torsion boxes 7 on both sides are connected by the rear crossbeam 8 of the engine compartment, and the lower crossbeam 6 of the rear floor, the rear crossbeam 8 of the engine compartment, the sill beams 2 on both sides and the torsion boxes 7 are connected to form a ring structure. This embodiment can utilize the high strength of the ring structure to improve the structural strength and torsional stiffness of the bottom of the vehicle body, and at the same time, it can form a ring force transmission channel at the bottom of the vehicle body, which helps to transmit and disperse the collision force.

[0067] Based on the above overview, specifically, in this embodiment, the torque boxes 7 on both sides are in a "V" shape. The front end of each torque box 7 is connected to the bottom of the rear end of the front engine compartment longitudinal beam 4, one side of the rear end of each torque box 7 is connected to the front end of the sill beam 2, and the other side is connected to the rear engine compartment crossbeam 8. In specific implementation, the aforementioned torque boxes 7 can adopt the conventional structure found in existing vehicle models, and they are usually connected to the front engine compartment longitudinal beam 4, the sill beam 2, and the rear engine compartment crossbeam 8 by welding.

[0068] The aforementioned rear crossbeam 8 of the engine compartment is specifically connected to the front end of the front floor panel 3 and located at the bottom of the front floor panel 3. This rear crossbeam 8 also spans the central tunnel at the bottom to connect the torsion boxes 7 on both sides. In practice, the rear crossbeam 8 of this embodiment can adopt a beam structure commonly found in existing vehicle models, and it can be, for example, a sheet metal welded structure, or it can be made of extruded aluminum.

[0069] Continue as Figures 3 to 6 As shown, in a preferred embodiment, the rear floor assembly 1 of this embodiment has a rear floor frame 100 and a rear floor panel 200 covering the rear floor frame 100.

[0070] The rear floor frame 100 includes rear floor longitudinal beams 101 on both sides and a rear floor middle crossbeam 102 connecting the two rear floor longitudinal beams 101. Each rear floor longitudinal beam 101 is connected to the rear end of the sill beam 2 on the same side, and the lower rear floor crossbeam 6 is connected between the front section 101a of the two rear floor longitudinal beams 101 and the rear floor middle crossbeam 102.

[0071] At this time, by connecting the lower crossbeam 6 of the rear floor between the front section 101a of the longitudinal beams 101 of the rear floor on both sides and the middle crossbeam 102 of the rear floor, the strength and rigidity of the front part of the rear floor assembly 1 can be increased, the stability of the battery pack rear end or fuel tank installation in the vehicle body can be improved, and the structural strength of the rear floor frame 100 can also be increased, which in turn helps to improve the overall torsional rigidity of the rear floor assembly 1.

[0072] It should be noted that, in this embodiment, the rear floor frame 100 can be a conventional sheet metal welded structure, but as a preferred embodiment, the rear floor frame 100 can also be integrally formed, specifically manufactured using an integral thermoforming process. This facilitates the forming of the rear floor frame 100, reduces the number of parts and welding processes, and also ensures the structural strength of the rear floor frame 100.

[0073] One-piece thermoforming is a forming process frequently used in current car body manufacturing. It typically involves heating a steel sheet to uniformly austenitize it, then stamping it into a mold with an internal cooling system. Finally, through cooling, the austenite is transformed into martensite, etc., completing the forming process. Through the above forming process, the prepared car body parts can be hardened, thereby significantly improving their strength.

[0074] Specifically, in practical implementation, a preferred method is to use laser welding thermoforming, which involves using laser welding technology to join sheets of different materials, thicknesses, and coatings together and weld them into a single sheet before the hot stamping process. This single sheet is then hot stamped to produce the rear floor frame 100. Laser welding can address the performance requirements of ultra-wide panels and different parts of the rear floor frame 100, resulting in significant improvements in vehicle weight reduction, overall vehicle cost reduction, energy conservation, and environmental protection.

[0075] In this embodiment, as a preferred implementation, the rear floor frame 100 further includes a rear floor front crossbeam 103. This rear floor front crossbeam 103 connects the front sections 101a of the two rear floor longitudinal beams 101, and the rear floor front crossbeam 103, the rear floor middle crossbeam 102, and the two rear floor longitudinal beams 101 are connected to form a ring structure. By providing the rear floor front crossbeam 103 and connecting it with the rear floor middle crossbeam 102 and the two rear floor longitudinal beams 101 to form a ring structure, the structural strength of the rear floor frame 100 can be further enhanced by utilizing the high strength of the ring structure.

[0076] In addition to the rear floor front crossbeam 103, this embodiment further includes a rear floor frame 100 with a rear floor rear crossbeam 104. This rear floor rear crossbeam 104 connects the rear sections 101b of the two rear floor longitudinal beams 101. Simultaneously, the rear floor middle crossbeam 102 is specifically connected to the transition area between the front sections 101a and rear sections 101b of each rear floor longitudinal beam 101, thus positioning the rear floor front crossbeam 103 and rear floor rear crossbeam 104 on the front and rear sides of the rear floor middle crossbeam 102, respectively.

[0077] Similar to the front crossbeam 103 of the rear floor, in this embodiment, the rear crossbeam 104, the middle crossbeam 102, and the longitudinal beams 101 on both sides of the rear floor are also connected to form a ring structure. Thus, by setting the rear crossbeam 104 and connecting the rear crossbeam 104, the middle crossbeam 102, and the longitudinal beams 101 on both sides of the rear floor to form a ring structure, the rigidity of the rear floor frame 100 can be better improved by utilizing a double-ring structure based on the ring structure formed by the front crossbeam 103.

[0078] Furthermore, based on the rear floor panel 200 covering the rear floor frame 100, generally, the left and right sides of the rear floor panel 200 will have a longitudinal beam cover plate 200a that specifically covers the top of the rear floor longitudinal beam 101. By covering the top of the rear floor longitudinal beam 101 with the longitudinal beam cover plate 200a, a longitudinal beam cavity can be formed inside the rear floor longitudinal beam 101. By utilizing the high structural strength of the cavity, the overall structural strength of the rear floor longitudinal beam 101 can be guaranteed.

[0079] Of course, in addition to forming longitudinal beam cavities, beam cavities can also be formed at the rear floor crossbeams 102 and 104, based on the coverage of the rear floor panel 200. At the rear floor front crossbeam 103, a rear floor front crossbeam reinforcing plate 300 can be further provided. This plate connects between the two rear door sill beams 2a, and together with the rear floor front crossbeam 103 and the rear floor panel 200, it forms a cavity structure to increase the structural strength at the rear floor front crossbeam 103.

[0080] Still Figures 3 to 6 As shown, in this embodiment, each side sill beam 2 has a rear sill beam 2a at its rear end, and each side sill beam 2 is connected to the rear floor longitudinal beam 101 on the same side through the rear sill beam 2a. Furthermore, the rear sill beam 2a, as the rear end part of the sill beam 2, mainly serves to connect with the rear floor longitudinal beam 101 and the C-pillar, etc. In terms of specific structure, the rear end of the rear sill beam 2a is also usually connected to the rear floor longitudinal beam 101, the longitudinal beam cover plate 200a, and the front end of the rear wheel arch, etc., to form a stable structure.

[0081] In this embodiment, each rear sill beam 2a is connected to the front section 101a of the rear floor longitudinal beam 101 on the same side, and the left and right sides of the lower rear floor crossbeam 6 are also connected to the corresponding rear sill beam 2a. Thus, it can be understood that by setting the rear sill beam 2a and connecting the lower rear floor crossbeam 6 to the rear sill beams 2a on both sides, a connection can be established between the lower rear floor crossbeam 6 and the sill beams on both sides of the vehicle body, thereby improving the setting effect of the lower rear floor crossbeam 6.

[0082] In this embodiment, the structure of the lower crossbeam 6 of the rear floor is as follows: Figure 7 As shown, for ease of description, the C-shaped lower crossbeam 6 of the rear floor can be divided into left and right side sections 6a and a middle section 6b. The side sections 6a are mainly connected to the front sections 101a of the rear floor longitudinal beams 101 on both sides, and to the rear door sill beams 2a on both sides. The middle section 6b is mainly connected to the middle crossbeam 102 of the rear floor.

[0083] To further enhance the structural strength of the front sides of the rear floor assembly 1, the following continues... Figure 8As shown, taking one side as an example, in this embodiment, a longitudinal beam front section cavity M is also formed between the front section 101a, the rear sill beam 2a, and the rear floor panel 200 on each side. At the same time, a lower crossbeam side cavity N is formed between the front section 101a, the rear sill beam 2a, and the lower crossbeam 6 of the rear floor. The longitudinal beam front section cavity M and the lower crossbeam side cavity N are stacked in the vertical direction of the entire vehicle.

[0084] At this point, by forming the upper and lower stacked longitudinal beam front cavity M and the lower crossbeam side cavity N, the dual-cavity structure can be used to increase the structural strength of the front two sides of the rear floor assembly.

[0085] Based on the aforementioned longitudinal beam front cavity M and lower crossbeam side cavity N, this embodiment preferably continues as follows: Figure 9 As shown, a middle crossbeam cavity S is formed between the middle crossbeam 102 of the rear floor and the rear floor panel 200. At the same time, a lower crossbeam middle cavity T is formed between the lower crossbeam 6 of the rear floor and the middle crossbeam 102 of the rear floor. The middle crossbeam cavity S and the lower crossbeam middle cavity T are also stacked in the vertical direction of the whole vehicle.

[0086] In this way, by forming the middle crossbeam cavity S and the lower crossbeam middle cavity T, which are also stacked in the upper and lower layers, the structural strength of the front middle position of the rear floor assembly can be increased by utilizing the double cavity structure. At the same time, it can also cooperate with the double cavity structures on both sides to improve the dynamic stiffness of the front mounting point of the rear subframe and improve the collision performance of the rear of the vehicle.

[0087] In this embodiment, preferably, the vehicle involved is a new energy vehicle, thus including a battery pack in the vehicle body. Meanwhile, the front end of the battery pack is connected to the rear crossbeam 8 of the engine compartment and the torsion boxes 7 on both sides, the left and right sides of the battery pack are respectively connected to the corresponding door sill beams 2, and the rear end of the battery pack is connected to the lower crossbeam 6 of the rear floor.

[0088] Understandably, by connecting the battery pack to each beam and the torsion box 7 and installing it in the vehicle body, not only can the battery pack be installed and arranged in the vehicle body, but the reliability of the battery pack installation can also be improved by utilizing the ring structure formed by each beam and the torsion box 7.

[0089] In a further preferred embodiment, when a battery pack is provided, sealing rings are provided between the top of the battery pack and the lower rear floor crossbeam 6, the rear cabin crossbeam 8, and the sill beams 2 and torsion box 7 on both sides. Furthermore, based on this, the top of the battery pack also forms the front floor panel 3 located between the sill beams 2 on both sides, and the front rear floor panel 200b located in front of the lower rear floor crossbeam 6.

[0090] In this way, by making the top of the battery pack form the front floor panel 3 and the front panel 200b of the rear floor, the existing front floor panel 2 and the front panel 200b of the rear floor can be eliminated, allowing the battery pack to be integrated with the vehicle body. This helps reduce the number of vehicle body parts and contributes to lightweight design and lower manufacturing costs. Of course, by installing sealing rings between the top of the battery pack and each beam and torsion box 7, the airtightness of the vehicle interior can be ensured when the top of the battery pack serves as the front floor panel 3 and the front panel 200b of the rear floor.

[0091] It should be noted that, in addition to using the top of the battery pack as the front floor panel 3 and the front panel 200b of the rear floor, in actual implementation, the front floor panel 2 and the front panel 200b of the rear floor are still provided in the vehicle body, which is also possible. Moreover, when the front panel 200b of the rear floor is replaced by the top of the battery pack, the middle part of the rear floor panel 200 is only arranged to the position of the rear floor middle crossbeam 102, while the parts on both sides that serve as longitudinal beam cover plates 200a are still arranged to the front end of the rear floor longitudinal beam 101. When the top of the battery pack is not used as the front panel 200b of the rear floor, the front panel 200b of the rear floor in this embodiment is arranged as follows: Figure 3 The arrangement can be done in the form shown in the image.

[0092] In this embodiment, it is still combined with Figure 1 As shown, a front seat mounting beam 5 is connected between the two side sill beams 2, and the front seat mounting beam 5 includes a front mounting beam 501 and a rear mounting beam 502 spaced apart along the front-rear direction of the vehicle. Furthermore, both the front mounting beam 501 and the rear mounting beam 502 are connected from one side of the sill beam 2 to the other side, and the middle of the battery pack is connected to both the front mounting beam 501 and the rear mounting beam 502.

[0093] Understandably, making the front seat mounting beams 5 a continuous structure ensures the continuity of the force transmission channels formed by the front seat mounting beams 5, which is beneficial for improving the force transmission capability in side collisions. Furthermore, connecting the middle of the battery pack to the front seat mounting beams 5 further enhances the stability of the battery pack within the vehicle body.

[0094] In specific implementation, to connect the battery pack and each front seat mounting beam 5, this embodiment can, for example, provide a beam structure within the battery pack that corresponds vertically to the front seat mounting beam 5, and connect this beam structure to its corresponding front seat mounting beam 5 via a screw connection. The aforementioned screw connection typically consists of a welded nut or threaded sleeve mounted on the front seat mounting beam 5, and a connecting bolt passing through the beam structure within the battery pack and screwed to the welded nut or threaded sleeve.

[0095] As a preferred implementation, such as Figure 10As shown, taking the front mounting crossbeam 501 as an example, both the front mounting crossbeam 501 and the rear mounting crossbeam 502 in this embodiment can be formed by roll forming. Structurally, both the front mounting crossbeam 501 and the rear mounting crossbeam 502 are configured to have multiple crossbeam bodies 5a connected sequentially along the front-rear direction of the vehicle. The cross-section of each crossbeam body 5a is U-shaped. At the same time, the connection points between the front mounting crossbeam 501 and the rear mounting crossbeam 502 and the battery pack are located between two adjacent crossbeam bodies 5a, that is, the projection-welded nuts or threaded sleeves serving as mounting points are fixedly connected between adjacent crossbeam bodies 5a.

[0096] At this point, the front seat mounting beam 5 is formed using a roll forming process, and it is composed of multiple beam bodies 501 with a Z-shaped cross-section. This increases the structural strength of the front seat mounting beam 5, which helps improve the stability of the front seats and battery pack. It also helps improve the torsional stiffness of the vehicle body and the impact force transmission effect of the front seat mounting beam 5. In addition, the connection points between each front seat mounting beam 5 and the battery pack are located between two adjacent beam bodies 5a, which also facilitates the arrangement of battery pack mounting points on the front seat mounting beam 5.

[0097] In this embodiment, the battery pack mounting points located on the lower crossbeam 6 of the rear floor, the torsion box 7, and the rear section crossbeam 8 of the engine compartment can generally adopt conventional mounting structures such as threaded sleeves or welded nuts. Similarly, the battery pack mounting points on the sill beam 2 can also employ conventional structures such as threaded sleeves or welded nuts. However, as a preferred embodiment, combined with… Figures 11 to 13 As shown, the battery pack mounting point located at the sill beam 2 specifically includes a mounting through hole 201 on the rear sill beam 2a and a nut plate 9 inside the rear sill beam 2a.

[0098] The mounting hole 201 is an elongated hole extending along the left-right direction of the vehicle. The nut plate 9 has a base plate 901 and a welded nut 902 disposed on the base plate 901. At the same time, a collapsible plate 901a is also connected to the base plate 901 via a deformable connecting part 901b. The welded nut 902 is welded to the collapsible plate 901a, and when the connecting part 901b deforms, the welded nut 902 can move relative to the base plate 901 along the length direction of the mounting hole 201.

[0099] Thus, by making the battery pack mounting point at the sill beam 2 consist of a long strip mounting hole 201 and a nut plate 9 having a base plate 901 and a welding nut 902, and the welding nut 902 can move relative to the base plate 901 along the length direction of the mounting hole 201, this embodiment can achieve the collapse displacement of the battery pack side mounting point when the vehicle is involved in a side collision, which helps to reduce the impact on the battery pack and improve the safety of the battery pack.

[0100] In this embodiment, for the aforementioned nut plate 9, more specifically, please refer to... Figure 12 and Figure 13 As shown, as an exemplary structural form, a through hole 901c is provided on the base plate 901, and one side of the through hole 901c also penetrates the base plate 901. At the same time, the crumple plate 901a is located in the through hole 901c. The crumple plate 901a is located at both ends in the length direction (left-right direction of the vehicle) of the mounting hole 201. One end is connected to the base plate 901 through the connecting part 901b, and the other end forms a crushing deformation zone k between itself and the inner wall of the through hole 901c.

[0101] At this time, the collapse plate 901a is placed in the through hole 901c on the base plate 901, and one end of the collapse plate 901a is connected to the base plate 901 through the connecting part 901b, while the other end forms a crushing deformation zone k. This helps to simplify the structure of the nut plate 9 and can limit the movement distance of the collapse plate 901a with the welded nut 902, thus ensuring the performance of the nut plate 9 when it collapses.

[0102] In this embodiment, the connecting portion 901b can be, for example, a curved connecting plate. In its natural state, the connecting plate is curved, and the crumple plate 901a is installed in the base plate 901. When a side collision occurs, the side of the battery pack is subjected to force, which is transmitted to the crumple plate 901a via bolts connected to the weld nut 902. Then, the crumple plate 901a pulls on the connecting portion 901b, deforming the curved connecting portion 901b and compressing the crushing deformation zone k, thereby achieving the crumple function of the battery pack mounting point.

[0103] It is understandable that in this embodiment, the connecting portion 901b is made of a curved connecting plate, which not only has the advantages of simple structure and easy manufacturing, but also has a good collapse deformation effect. Moreover, in specific implementation, in addition to using a curved connecting plate located at one end of the collapse plate 901a, the connecting portion 901b can also be set in other positions. For example, it is also possible to set the connecting portion 901b composed of curved connecting plates on the front and rear sides of the collapse plate 901a.

[0104] In this embodiment, the vehicle body features a C-shaped lower rear floor crossbeam 6, which connects the torsion boxes 7 on both sides via the rear engine compartment crossbeam 8. The lower rear floor crossbeam 6, the rear engine compartment crossbeam 8, the sill beams 2 on both sides, and the torsion boxes 7 are connected to form a ring structure. This not only utilizes the high strength of the ring structure to improve the structural strength and torsional stiffness of the vehicle body bottom, but also forms a ring-shaped force transmission channel at the bottom of the vehicle body, which helps to distribute the collision force and thus improves the overall collision safety of the vehicle.

[0105] In the event of a car collision, such as Figure 14 As shown, taking a frontal collision as an example, the collision force is transmitted rearward from the longitudinal beam 4 of the front engine compartment. At the rear end of the front engine compartment, the collision force can be transmitted laterally (in the left-right direction of the entire vehicle) via the rear crossbeam 8 of the engine compartment. In the middle of the vehicle, the collision force can be transmitted rearward along the side sill beams 2, and can also be transmitted laterally using the front seat mounting beams 5. At the rear of the vehicle, the collision force from the sill beams 2 can be transmitted longitudinally (in the front-rear direction of the entire vehicle) and laterally at the rear floor frame 100, and can also be transmitted using the lower rear floor beams 6.

[0106] Therefore, through the transmission and dispersion of the front engine compartment longitudinal beam 4, torsion box 7, rear engine compartment crossbeam 8, sill beam 2, rear floor frame 100, and lower rear floor crossbeam 6, the collision force can be absorbed and dissipated, thereby improving the collision safety of the vehicle.

[0107] Example 2

[0108] This embodiment relates to a car that incorporates the body of the car described in Embodiment 1. By incorporating the body of the car described in Embodiment 1, this embodiment enhances the structural strength and torsional stiffness of the vehicle's underside, and also facilitates the transmission and dispersion of collision forces, thereby improving the overall collision safety of the vehicle and demonstrating excellent practicality.

[0109] The above description is only a preferred embodiment of the present invention and is 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 within the protection scope of the present invention.

Claims

1. A car body, characterized in that: Includes the lower rear floor crossbeam (6) located at the bottom of the rear floor assembly (1), the sill beams (2) located on the left and right sides respectively, and the torsion box (7) connected to the rear end of the front cabin longitudinal beams (4) on the left and right sides respectively. The rear floor assembly (1) has a rear floor frame (100), which is integrally thermoformed. The lower crossbeam (6) of the rear floor is connected to the bottom of the rear floor frame (100). The lower crossbeam (6) of the rear floor is in the shape of a "C" with the opening facing forward. The left and right sides of the lower crossbeam (6) of the rear floor are respectively connected to the rear end of the corresponding side threshold beam (2). Each side of the torsion box (7) is connected to the front end of the sill beam (2) on the same side, and the two sides of the torsion box (7) are connected to the rear section crossbeam (8) of the cabin. The lower crossbeam (6) of the rear floor, the rear crossbeam (8) of the cabin, the sill beams (2) on both sides, and the torsion box (7) are connected to form a ring structure.

2. The vehicle body according to claim 1, characterized in that: The rear floor assembly (1) has a rear floor panel (200) covering the rear floor frame (100). The rear floor frame (100) has rear floor longitudinal beams (101) on both sides, and a rear floor crossbeam (102) connecting the rear floor longitudinal beams (101) on both sides. The rear floor longitudinal beams (101) on each side are connected to the rear end of the threshold beam (2) on the same side, and the lower rear floor crossbeam (6) is connected between the front section (101a) of the rear floor longitudinal beams (101) on both sides and the middle rear floor crossbeam (102).

3. The vehicle body according to claim 2, characterized in that: The rear floor frame (100) also has a rear floor front crossbeam (103). The front crossbeam (103) of the rear floor is connected between the front sections (101a) of the longitudinal beams (101) of the rear floor on both sides, and the front crossbeam (103), the middle crossbeam (102) of the rear floor and the longitudinal beams (101) of the rear floor on both sides are connected to form a ring structure.

4. The vehicle body according to claim 3, characterized in that: The rear floor frame (100) also has a rear floor crossbeam (104). The rear floor crossbeam (104) is connected between the rear sections (101b) of the rear floor longitudinal beams (101) on both sides, and the rear floor middle crossbeam (102) is connected in the transition area between the front section (101a) and the rear section (101b) of the rear floor longitudinal beams (101) on each side. The rear floor crossbeam (104), the rear floor middle crossbeam (102), and the rear floor longitudinal beams (101) on both sides are connected to form a ring structure.

5. The vehicle body according to claim 2, characterized in that: The rear ends of the threshold beams (2) on both sides are provided with rear threshold beams (2a), and the rear threshold beams (2a) on each side are connected to the rear floor longitudinal beams (101); A longitudinal beam front cavity (M) is formed by enclosing between the front section (101a) on each side, the rear sill beam (2a) and the rear floor panel (200), and a lower beam side cavity (N) is formed by enclosing between the front section (101a) on each side, the rear sill beam (2a) and the lower cross beam of the rear floor (6); The longitudinal beam front cavity (M) and the lower beam side cavity (N) are stacked in the vehicle up-and-down direction.

6. The vehicle body according to claim 5, wherein: A middle cross beam cavity (S) is formed by enclosing between the middle cross beam of the rear floor (102) and the rear floor panel (200); A lower beam middle cavity (T) is formed by enclosing between the lower cross beam of the rear floor (6) and the middle cross beam of the rear floor (102); The middle cross beam cavity (S) and the lower beam middle cavity (T) are stacked in the vehicle up-and-down direction.

7. The vehicle body according to any one of claims 1 to 6, wherein: It further includes a battery pack; The front end of the battery pack is connected to the rear section cross beam of the engine compartment (8) and the torque boxes (7) on both sides, the left and right sides of the battery pack are respectively connected to the sill beams (2) on the corresponding sides, and the rear end of the battery pack is connected to the lower cross beam of the rear floor (6).

8. The vehicle body according to claim 7, wherein: Sealing rings are provided between the top of the battery pack and the lower cross beam of the rear floor (6), the rear section cross beam of the engine compartment (8), and the sill beams (2) and the torque boxes (7) on both sides; The top of the battery pack constitutes the front floor panel (3) between the sill beams (2) on both sides and the front part panel of the rear floor (200b) in front of the lower cross beam of the rear floor (6).

9. The vehicle body according to claim 7, wherein: A front row seat mounting cross beam (5) is connected between the sill beams (2) on both sides; The front row seat mounting cross beam (5) includes a front mounting cross beam (501) and a rear mounting cross beam (502) arranged at intervals in the vehicle front-and-rear direction; Both the front mounting cross beam (501) and the rear mounting cross beam (502) penetrate from one side of the sill beam (2) to the other side of the sill beam (2), and the middle part of the battery pack is connected to both the front mounting cross beam (501) and the rear mounting cross beam (502).

10. The vehicle body according to claim 9, wherein: Both the front mounting cross beam (501) and the rear mounting cross beam (502) are formed by roll forming; Both the front mounting cross beam (501) and the rear mounting cross beam (502) have a plurality of cross beam bodies (5a) connected in sequence in the vehicle front-and-rear direction, and the cross section of each cross beam body (5a) is in a "U" shape; The connection points of both the front mounting cross beam (501) and the rear mounting cross beam (502) with the battery pack are located between two adjacent cross beam bodies (5a).

11. The vehicle body according to claim 7, wherein: Both sides of the threshold beam (2) are provided with mounting holes (201) and nut plates (9) corresponding to the mounting holes (201); The mounting hole (201) is an elongated hole extending along the left and right direction of the vehicle. The nut plate (9) has a base plate (901) and a welding nut (902) set on the base plate (901). The battery pack is connected to the welding nut (902) by a connecting bolt passing through the mounting hole (201). A collapsible plate (901a) is connected to the base plate (901) via a deformable connecting part (901b). A welding nut (902) is connected to the collapsible plate (901a). When the connecting part (901b) deforms, the welding nut (902) can move relative to the base plate (901) along the length direction of the mounting hole (201).

12. The vehicle body according to claim 11, characterized in that: The base plate (901) has a through hole (901c), and the collapse plate (901a) is located inside the through hole (901c). The collapse plate (901a) is located at both ends of the mounting through hole (201) along its length. One end of the collapse plate (901a) is connected to the base plate (901) through the connecting part (901b), and the other end forms a crushing deformation space (k) between itself and the inner wall of the through hole (901c); and / or, The connecting part (901b) adopts a curved connecting plate.

13. An automobile, characterized in that: The automobile has the body of the automobile as described in any one of claims 1 to 12.

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