A vehicle rear floor structure

Abstract

This invention discloses a vehicle rear floor structure, in which the rear floor, floor crossbeam, rear longitudinal beam, and rear shock absorber seat are integrally cast as a die-cast part, while the rear wheel arch is a sheet metal part. When the vehicle needs to be replaced with larger tires, only the rear wheel arch needs to be replaced. The die-cast part can be made into a common part for different models within the platform, resulting in a high degree of platform commonality and integration, saving rear floor welding time, improving production efficiency, and saving costs. This invention improves the structural strength at the upper mounting point of the shock absorber by connecting transverse and longitudinal reinforcing ribs around the internal threaded sleeve and between it and the shock absorber mounting plate. At the same time, first and second reinforcing ribs, which are coplanar with and connected to the transverse reinforcing ribs, are configured to further enhance the structural strength at the upper mounting point of the shock absorber and are used to transfer stress downwards. The lower end of the second reinforcing rib is connected to the rear longitudinal beam through an oblique reinforcing rib, which helps guide the force transmitted to the rear longitudinal beam along the front-rear direction and reduces stress concentration at the connection between the rear longitudinal beam and the main support body.

Description

Technical Field

[0001] This invention relates to the field of vehicle floor technology, and more particularly to a vehicle rear floor structure. Background Technology

[0002] In the existing technology, some vehicles use aluminum castings for the rear floor, and the rear wheel cover (rear inner wheel cover) is integrally cast with the rear floor and rear longitudinal beam. This limits the size of the tires. Different models cannot share tires because of different tire sizes. The level of platform sharing and integration is low, and new molds need to be developed, which is costly.

[0003] In existing technologies, rear floor structures made of cast aluminum components integrate the rear wheel arches directly with the floor and longitudinal beams. The mounting points for the rear shock absorbers are directly located on the rear wheel arches, specifically with mounting brackets installed on the rear wheel arches to mount the upper ends of the shock absorbers. Vibrations from the mounting brackets are directly and vertically transmitted to the rear wheel arches, necessitating reinforcement to prevent deformation and tire friction caused by the vibrations. The vibrations from the mounting brackets are also vertically transmitted to the rear longitudinal beams, resulting in high shear forces at their intersection. This hinders stress dispersion along the longitudinal direction of the rear longitudinal beams, requiring high rigidity from the beams. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings of the prior art and provide a novel vehicle rear floor structure, wherein the rear floor, floor crossbeam, rear longitudinal beam, and rear shock absorber seat are integrally cast into a die-cast part, and the inner wheel cover is separately disassembled into a sheet metal part. The die-cast part can be made into a common part for different models within the platform, resulting in a high degree of platform commonality and integration, high structural strength at the shock absorber mounting point, and reduced stress concentration at the connection between the rear longitudinal beam and the rear shock absorber seat, which is beneficial to reducing the stress load on the rear longitudinal beam.

[0005] The present invention provides a vehicle rear floor structure, including a die-cast part and a rear wheel cover connected to the die-cast part;

[0006] The die-cast component includes an integrally formed rear floor, rear longitudinal beam, floor crossbeam, and rear shock absorber seat, wherein the rear shock absorber seat is integrally mounted on the rear longitudinal beam;

[0007] The rear wheel arch is connected to the rear longitudinal beam and the rear shock absorber mount, respectively;

[0008] The rear shock absorber mount includes a support body connected to the rear longitudinal beam and an outer support plate and an inner support plate connected to the support body. The outer support plate and the inner support plate are connected and form an assembly groove for assembling the components of the rear wheel cover.

[0009] The bottom plate of the assembly slot is a shock absorber mounting plate for connecting the shock absorber. The top surface of the shock absorber mounting plate is provided with an internal threaded sleeve. The periphery of the internal threaded sleeve and the shock absorber mounting plate are connected with transverse reinforcing ribs and longitudinal reinforcing ribs.

[0010] The inner plate of the bracket and / or the inner side of the bracket body are provided with a first reinforcing rib extending inward and downward at an incline, and the outer side of the bracket body is provided with a second reinforcing rib extending downward at a downward angle. The first reinforcing rib, the transverse reinforcing rib and the second reinforcing rib are arranged in the same plane and integrally formed. The lower end of the first reinforcing rib is connected to the rear longitudinal beam and / or the rear floor, and the lower end of the second reinforcing rib is connected to the rear longitudinal beam through an oblique reinforcing rib.

[0011] The outer side of the support body is provided with a reinforcing force transmission structure connected to the rear longitudinal beam, and the second reinforcing rib and the diagonal reinforcing rib are respectively connected to the reinforcing force transmission structure.

[0012] In one of the alternative technical solutions, the reinforcing force transmission structure includes a longitudinal reinforcing plate located on the outside of the support body and extending front and rear, and a third reinforcing rib connected to the longitudinal reinforcing plate;

[0013] The third reinforcing rib is connected between the longitudinal reinforcing plate and the inner plate of the bracket and the top plate of the rear longitudinal beam, respectively.

[0014] The lower end of the second reinforcing rib is connected to the longitudinal reinforcing plate, and the upper end of the oblique reinforcing rib is connected to the longitudinal reinforcing plate.

[0015] In one of the optional technical solutions, multiple sets of longitudinal beam reinforcing ribs are provided between the top plate and the bottom plate of the rear longitudinal beam;

[0016] The longitudinal beam reinforcing structure includes a central column and multiple radially arranged longitudinal beam reinforcing ribs connected to the central column;

[0017] In each group of longitudinal beam reinforcing ribs, at least two longitudinal beam reinforcing ribs are connected to the top plate of the longitudinal beam, at least two longitudinal beam reinforcing ribs are connected to the bottom plate of the longitudinal beam, and at least one longitudinal beam reinforcing rib has the same extension direction as the rear longitudinal beam.

[0018] In any two adjacent sets of longitudinal beam stiffeners, the two longitudinal beam stiffeners that are adjacent to each other are connected.

[0019] In one of the alternative technical solutions, a plurality of top plate reinforcing columns are provided at intervals on the top plate of the longitudinal beam;

[0020] In each group of longitudinal beam reinforcing ribs, two of the longitudinal beam reinforcing ribs are respectively connected to two adjacent top plate reinforcing columns.

[0021] The lower ends of the reinforced force transmission structure and the oblique reinforcing ribs are respectively connected to the two top plate reinforcing columns.

[0022] In one of the alternative technical solutions, the bottom surface of the longitudinal beam base plate is provided with a shock-absorbing spring mounting plate, and at least two longitudinal beam reinforcing ribs are connected directly above the shock-absorbing spring mounting plate.

[0023] In one of the alternative technical solutions, the rear longitudinal beam includes a horizontally extending rear longitudinal beam main beam, a rear longitudinal beam transition beam connected to the front end of the rear longitudinal beam main beam and extending downwardly, and a rear longitudinal beam secondary beam connected to the front end of the rear longitudinal beam transition beam and extending horizontally.

[0024] The bottom surface of the rear longitudinal beam transition beam is provided with a front mounting platform that extends rearward and is used to install the subframe, and the bottom surface of the rear end of the rear longitudinal beam main beam is provided with a rear mounting platform for installing the subframe.

[0025] A vertically extending rear floor intermediate beam is connected between the front ends of the two rear longitudinal beam transition beams. The front mounting platform is connected to the rear floor intermediate beam, and the platform surface of the front mounting platform is located between the upper and lower ends of the rear floor intermediate beam.

[0026] The rear longitudinal beam sub-beam is provided with cross-arranged sub-beam reinforcing ribs, and the platform surface of the front mounting platform is located between the upper and lower ends of the sub-beam reinforcing ribs.

[0027] In one of the alternative technical solutions, the floor beam includes a front beam connecting the front ends of the two rear longitudinal beam sub-beams and a rear beam connecting the rear ends of the two rear longitudinal beam main beams.

[0028] The rear floor includes a rear floor body connected between the two rear longitudinal main beams and a rear floor transition plate connected between the two rear longitudinal transition beams. The rear end of the rear floor body is connected to the rear crossbeam.

[0029] The front crossbeam is provided with multiple front crossbeam reinforcing ribs, the rear crossbeam is provided with bent and extended rear crossbeam reinforcing ribs, and the bottom surface of the rear floor transition plate is provided with transition plate reinforcing ribs arranged in a cross pattern or in a mesh pattern.

[0030] In one of the alternative technical solutions, the front mounting platform is provided with a first mounting hole and two first weight-reducing holes. The two first weight-reducing holes are located on the side of the first mounting hole closer to the rear floor transition plate. The two first weight-reducing holes are separated by a first partition, which extends from the first mounting hole toward the rear floor transition plate side.

[0031] The transition plate reinforcing rib has a first reinforcing rib that is coplanar with the first rib, and the first reinforcing rib is connected to the side of the front mounting platform.

[0032] In one of the alternative technical solutions, the rear mounting platform is provided with a second mounting hole and two second weight-reducing holes. The two second weight-reducing holes are located on the side of the second mounting hole closer to the rear crossbeam. The two second weight-reducing holes are separated by a second partition, which extends from the second mounting hole toward the rear crossbeam side.

[0033] The rear crossbeam reinforcing bar has a second reinforcing plate bar that is coplanar with the second partition bar, and the second reinforcing plate bar is connected to the side of the rear mounting platform.

[0034] In one of the alternative technical solutions, the rear longitudinal beam and the side of the rear shock absorber seat are connected to a flanged frame, and the edge of the rear wheel arch is connected to the flanged frame.

[0035] In one of the alternative technical solutions, the rear wheel arch is connected to a C-pillar connector for connecting to the C-pillar of the vehicle and a D-pillar connector for connecting to the D-pillar of the vehicle;

[0036] The lower ends of the C-pillar connector and the D-pillar connector are integrally connected and assembled in the assembly slot.

[0037] In one of the alternative technical solutions, the vehicle rear floor structure includes a rear anti-collision beam assembly;

[0038] The rear bumper beam assembly includes a rear bumper beam and two sheet metal energy-absorbing boxes connected to the rear side of the rear bumper beam. The surface of the sheet metal energy-absorbing boxes is provided with multiple spaced crumple grooves.

[0039] The rear end of the rear longitudinal beam is connected to an extension beam, and the rear end of the extension beam is provided with an extension beam connecting plate. The front end of the sheet metal energy-absorbing box is provided with an energy-absorbing box connecting plate, and the energy-absorbing box connecting plate is connected to the extension beam connecting plate.

[0040] In one of the alternative technical solutions, the rear end of the rear longitudinal beam is provided with an installation groove;

[0041] The inner surface of the mounting groove wall is provided with multiple protruding ribs at intervals.

[0042] The extension beam includes a square tube and a cross-shaped reinforcing rib provided in the square tube. The outer surface of the square tube is provided with a collision energy-absorbing recess.

[0043] The front end of the extension beam is interference-fitted into the mounting groove, and the groove wall is connected to the square tube by fasteners.

[0044] In one of the alternative technical solutions, the vehicle rear floor structure includes a luggage compartment shell, which is connected between the rear end of the rear floor and the two extension beams;

[0045] The extension beam is connected to an L-shaped inner plate and an L-shaped outer plate;

[0046] The inner vertical plate of the L-shaped inner panel is located inside the extension beam and connected to the luggage box shell, and the inner flat plate of the L-shaped inner panel is connected to the top surface of the extension beam.

[0047] The vertical plate of the L-shaped outer plate is located outside the extension beam and is connected to the rear wheel cover, while the flat plate of the L-shaped outer plate is connected to the top surface of the extension beam.

[0048] In one of the alternative technical solutions, a portion of the outer plate is stacked on top of the inner plate, and a predetermined gap exists between the outer plate and the inner plate.

[0049] In one of the optional technical solutions, the bottom surface of the rear longitudinal beam sub-beam is provided with multiple fourth reinforcing ribs extending along the width direction, at least one fifth reinforcing rib extending along the front-rear direction, and at least one sixth reinforcing rib extending backward and inward.

[0050] At least one of the fourth reinforcing ribs is connected to the front crossbeam;

[0051] The fifth reinforcing rib is connected to the fourth reinforcing rib, and the rear end of the fifth reinforcing rib is connected to the front mounting platform;

[0052] The sixth reinforcing rib is connected to the fourth and fifth reinforcing ribs respectively. The rear end of the sixth reinforcing rib is connected to the front mounting platform, and the sixth reinforcing rib is flush with the inner edge of the front mounting platform.

[0053] The above technical solution has the following beneficial effects:

[0054] The vehicle rear floor structure provided by the present invention comprises a rear floor, floor crossbeam, rear longitudinal beam and rear shock absorber seat integrally cast as a die-cast part, and a rear wheel cover as a sheet metal part. The rear wheel cover is connected to the rear longitudinal beam and rear shock absorber seat by bolts, rivets, structural adhesive, etc.

[0055] This invention separates the rear wheel arch into a sheet metal part. Even if the vehicle needs to be replaced with larger tires, only the sheet metal rear wheel arch needs to be replaced. The die-cast part can be made into a common part for different models within the platform, eliminating the need to develop casting molds. The platform has a high degree of commonality and integration, saving rear floor welding time, improving production efficiency, and saving costs.

[0056] This invention improves the structural strength at the upper mounting point of the shock absorber by connecting transverse and longitudinal reinforcing ribs around the internal threaded sleeve and between it and the shock absorber mounting plate. At the same time, it configures first and second reinforcing ribs that are coplanar with and connected to the transverse reinforcing ribs to further enhance the structural strength at the upper mounting point of the shock absorber and to transmit stress downwards. As a result, very little vibration from the shock absorber is transmitted to the rear wheel arch, which can reduce the sheet metal thickness of the rear wheel arch and save costs.

[0057] The lower end of the second reinforcing rib is connected to the rear longitudinal beam via an oblique reinforcing rib, which helps to guide the force transmitted to the rear longitudinal beam along the front-to-back direction and reduces stress concentration at the connection between the rear longitudinal beam and the main support body. Attached Figure Description

[0058] The disclosure of this invention will become more readily understood by referring to the accompanying drawings. It should be understood that these drawings are for illustrative purposes only and are not intended to limit the scope of protection of this invention. In the drawings:

[0059] Figure 1 A perspective view of a vehicle rear floor structure provided in an embodiment of the present invention, viewed from a first perspective.

[0060] Figure 2 for Figure 1 The exploded view of the rear floor structure of the vehicle shown.

[0061] Figure 3 A perspective view of a vehicle rear floor structure provided in an embodiment of the present invention from a second perspective.

[0062] Figure 4 A perspective view of a vehicle rear floor structure provided in an embodiment of the present invention from a third-person perspective.

[0063] Figure 5 An exploded view of the die-cast and sheet metal parts in a vehicle rear floor structure provided in an embodiment of the present invention;

[0064] Figure 6 Exploded views of the die-cast parts, rear wheel arches, rear floor panel, trunk shell, flange frame, L-shaped inner panel, and L-shaped outer panel;

[0065] Figure 7 This is a three-dimensional view of the die-cast part from above.

[0066] Figure 8This is a three-dimensional view of the die-cast part from below.

[0067] Figure 9 This is a side view of the die-cast part;

[0068] Figure 10 This is a magnified view of the rear shock absorber mount from the inside out.

[0069] Figure 11 This is a magnified view of the rear shock absorber mount viewed from the lower outer side at an angle upwards.

[0070] Figure 12 This is a magnified view of the rear shock absorber mount from above.

[0071] Figure 13 This is a three-dimensional view of the rear longitudinal beam and the rear shock absorber mount.

[0072] Figure 14 This is an enlarged schematic diagram of the connection between the rear longitudinal sub-beam and the front mounting platform.

[0073] Figure 15 This is an enlarged schematic diagram of the connection between the rear longitudinal beam and the rear shock absorber seat.

[0074] Figure 16 This is an enlarged schematic diagram of the connection between the rear mounting platform and the rear crossbeam.

[0075] Figure 17 An enlarged schematic diagram of the connection between the front mounting platform and the rear floor transition plate;

[0076] Figure 18 A perspective view of the rear wheel arch with C-pillar and D-pillar connectors;

[0077] Figure 19 A perspective view showing the connection between the die-cast part and the rear bumper beam assembly;

[0078] Figure 20 Exploded view of the die-cast parts and rear bumper beam assembly;

[0079] Figure 21 This is an exploded view of the rear longitudinal beam, main beam, and extension beam;

[0080] Figure 22 A 3D view of a sheet metal energy-absorbing box with a crumple zone.

[0081] Figure 23 This is a magnified view of the rear floor structure of the vehicle from a low angle. Detailed Implementation

[0082] The specific embodiments of the present invention will be further described below with reference to the accompanying drawings. Identical components are indicated by the same reference numerals. It should be noted that the terms "front," "rear," "left," "right," "up," and "down" used in the following description refer to directions in the accompanying drawings, while the terms "inner" and "outer" refer to directions toward or away from the geometric center of a specific component, respectively.

[0083] In this invention, Y-direction, lateral direction, and transverse direction refer to the width direction of the vehicle body, while X-direction refers to the front-to-back direction of the vehicle body.

[0084] like Figure 1-12 As shown, a vehicle rear floor structure provided in an embodiment of the present invention is characterized by comprising a die-cast part and a rear wheel cover 5 connected to the die-cast part.

[0085] The die-cast component includes an integrally formed rear floor 1, rear longitudinal beam 2, floor crossbeam 3, and rear shock absorber seat 4, with the rear shock absorber seat 4 integrally mounted on the rear longitudinal beam 2.

[0086] The rear wheel cover 5 is connected to the rear longitudinal beam 2 and the rear shock absorber seat 4 respectively.

[0087] The rear shock absorber mount 4 includes a bracket body 41 connected to the rear longitudinal beam 2, and a bracket outer plate 42 and a bracket inner plate 43 connected to the bracket body 41. The bracket outer plate 42 and the bracket inner plate 43 are connected and form an assembly groove 44 for assembling components for the rear wheel cover 5.

[0088] The bottom plate of the assembly slot 44 is a shock absorber mounting plate 45 for connecting the shock absorber. The top surface of the shock absorber mounting plate 45 is provided with an internal threaded sleeve 451. The periphery of the internal threaded sleeve 451 is connected to the shock absorber mounting plate 45 with transverse reinforcing ribs 452 and longitudinal reinforcing ribs 453.

[0089] The inner plate 43 of the bracket and / or the inner side of the bracket body 41 are provided with a first reinforcing rib 46 that extends inward and downward at an incline, and the outer side of the bracket body 41 is provided with a second reinforcing rib 47 that extends downward. The first reinforcing rib 46, the transverse reinforcing rib 452 and the second reinforcing rib 47 are arranged in the same plane and integrally formed. The lower end of the first reinforcing rib 46 is connected to the rear longitudinal beam 2 and / or the rear floor 1, and the lower end of the second reinforcing rib 47 is connected to the rear longitudinal beam 2 through an oblique reinforcing rib 48.

[0090] The outer side of the support body 41 is provided with a reinforcing force transmission structure 49 connected to the rear longitudinal beam 2, and the second reinforcing rib 47 and the diagonal reinforcing rib 48 are respectively connected to the reinforcing force transmission structure 49.

[0091] The vehicle rear floor structure provided by this invention includes die-cast parts and sheet metal parts. Specifically, the rear floor 1, rear longitudinal beams 2, floor crossbeams 3, and rear shock absorber mounts 4 are integrally die-cast into a single structure. The die-cast parts are preferably aluminum castings, which are lightweight. A rear longitudinal beam 2 is integrally connected to each of the left and right sides of the rear floor 1, and the floor crossbeam 3 is integrally connected between two rear longitudinal beams 2. A rear shock absorber mount 4 is integrally connected to the top surface of each rear longitudinal beam 2. The rear shock absorber mount 4 is used to install the rear shock absorber (hereinafter referred to as the shock absorber) and the rear inner wheel cover (hereinafter referred to as the rear wheel cover 5).

[0092] The rear end of the rear floor 1 is integrally connected to the rear crossbeam 32 of the floor beam 3. A frame structure is formed between the front crossbeam 31 of the floor beam 3, the two rear longitudinal beams 2, and the front end of the rear floor 1. A sheet metal rear floor panel 9 is mounted on this frame structure. A reinforcing sheet metal part 91 connects the rear floor panel 9 to the front end of the rear longitudinal beam 2. The rear end of the rear floor panel 9 is connected to the front end of the rear floor 1.

[0093] The rear wheel arch 5 is a sheet metal part, which is connected to the rear longitudinal beam 2 and the rear shock absorber seat 4 respectively. Specifically, the connection can be made by bolts, rivets, structural adhesive, etc. Even if the vehicle needs to be replaced with larger tires, only the sheet metal rear wheel arch 5 needs to be replaced. The die-cast part can be made into a common part for different models within the platform, without the need to develop casting molds. The platform has a high degree of commonality and integration, which saves costs.

[0094] The specific structure of the rear shock absorber mount 4 is as follows:

[0095] The rear shock absorber mount 4 comprises a bracket body 41, a bracket outer plate 42, and a bracket inner plate 43, all integrally formed. The lower end of the bracket body 41 is integrally connected to the rear longitudinal beam 2. The bracket outer plate 42 is connected to the upper part of the bracket body 41. The bracket outer plate 42 is generally flat and has through holes for bolts and rivets to pass through for connection with the rear wheel arch 5. The bracket inner plate 43 is connected to the upper part of the bracket body 41 and is located inside the bracket outer plate 42. The bracket inner plate 43 is generally U-shaped and its two sides are connected to the bracket outer plate 42, thus forming an assembly groove 44 between the bracket outer plate 42 and the bracket inner plate 43. The assembly groove 44 is used to assemble components of the rear wheel arch 5.

[0096] The bottom plate of the assembly slot 44 is a shock absorber mounting plate 45 for connecting the shock absorber. The shock absorber mounting plate 45 is integrally connected to the lower end of the outer plate 42 of the bracket and extends thereto. The shock absorber mounting plate 45 is integrally connected to the inner plate 43 of the bracket.

[0097] The top surface of the shock absorber mounting plate 45 is integrally provided with two internally threaded sleeves 451, arranged at an interval. Correspondingly, the shock absorber mounting plate 45 has mounting plate through holes aligned with the internally threaded sleeves 451. Bolts at the upper end of the shock absorber can pass through the mounting plate through holes and connect to the internally threaded sleeves 451. The internally threaded sleeves 451 are located in the assembly groove 44, with their tops lower than the top opening of the assembly groove 44, so as not to affect the insertion of components of the rear wheel cover 5.

[0098] To improve the structural strength of the internal threaded sleeve 451, a transverse reinforcing rib 452 and a longitudinal reinforcing rib 453 connected to the shock absorber mounting plate 45 are provided around each internal threaded sleeve 451. The transverse reinforcing rib 452 and the longitudinal reinforcing rib 453 intersect in a cross shape. In this invention, longitudinal refers to approximately along the vehicle length direction or the front-to-back direction, transverse refers to approximately along the vehicle width direction or the left-to-right direction, and vertical refers to approximately along the vehicle height direction or the up-and-down direction. The transverse reinforcing rib 452 and the longitudinal reinforcing rib 453 are integrally formed with the shock absorber mounting plate 45, protruding from the top surface of the shock absorber mounting plate 45, and may also protrude from the bottom surface of the shock absorber mounting plate 45, so as to be integrally connected with other subsequent reinforcing ribs.

[0099] To further improve the structural strength of the shock absorber mounting point and facilitate stress diffusion, a first reinforcing rib 46 is integrally provided on the inner side of the bracket inner plate 43 and / or bracket body 41, and a first reinforcing rib 46 is provided on the inner side of each internally threaded sleeve 451. The first reinforcing rib 46 extends obliquely inward and downward and connects with the rear longitudinal beam 2. The first reinforcing rib 46 is integrally provided with the bracket inner plate 43 and / or bracket body 41, and it can partially protrude from one side of the bracket inner plate 43 and / or bracket body 41 (e.g., the inner side, where the inner side refers to the side facing the vehicle interior). Of course, it can also partially protrude from both sides of the bracket inner plate 43 and / or bracket body 41 (e.g., the inner and outer sides, where the outer side refers to the side facing the tire) so as to connect with other reinforcing ribs.

[0100] A second reinforcing rib 47 is integrally provided on the outer side of the support body 41, and a second reinforcing rib 47 is provided on the outer side of each internally threaded sleeve 451. The second reinforcing rib 47 extends downward, and the lower end of the second reinforcing rib 47 is connected to the rear longitudinal beam 2 through an oblique reinforcing rib 48. The oblique reinforcing rib 48 refers to a reinforcing rib that extends downward while also being arranged obliquely towards the front or rear.

[0101] The first reinforcing rib 46, the transverse reinforcing rib 452, and the second reinforcing rib 47 are arranged coplanarly and integrally. That is, along the left-right direction, the first reinforcing rib 46, the transverse reinforcing rib 452, and the second reinforcing rib 47 are in the same plane and are integrally connected. The integral connection of the three can include direct connection of the ends of the three to each other, or indirect connection of the ends of the three to each other through the outer plate 42 of the bracket, the inner plate 43 of the bracket, and the shock absorber mounting plate 45. Since the rear shock absorber seat 4 is a one-piece casting, even if the ends of the first reinforcing rib 46, the transverse reinforcing rib 452, and the second reinforcing rib 47 are indirectly connected through the outer plate 42 of the bracket, the inner plate 43 of the bracket, and the shock absorber mounting plate 45, it is still considered as an integral connection structure.

[0102] This arrangement greatly improves the structural strength at the shock absorber mounting point. The downward stress on the shock absorber mounting plate 45 can be borne and transferred through the transverse stiffener 452, the first stiffener 46, and the second stiffener 47, thus reducing the load on the shock absorber mounting plate 45.

[0103] Preferably, the transverse reinforcing rib 452 is located on a diameter extending in the left-right direction of the internal threaded sleeve 451, so that the transverse reinforcing rib 452 is located in the center of the internal threaded sleeve 451 and bears the load stress in the left-right direction.

[0104] The longitudinal stiffener 453 is located on a diameter extending along the front-rear direction of the internal threaded sleeve 451, so that the longitudinal stiffener 453 is located in the center of the internal threaded sleeve 451 and bears the load stress in the front-rear direction.

[0105] Because the rear shock absorber seat 4 has a large front-to-back dimension and a small left-to-right dimension, the rear shock absorber seat 4 and the shock absorber mounting plate 45 are sufficient to bear the front-to-back load stress transmitted by the internal threaded sleeve 451 without the need for excessive reinforcement, thus saving costs.

[0106] In order to improve the force transmission performance of the rear shock absorber seat 4, a reinforcing force transmission structure 49 is provided on the outside of the support body 41. The reinforcing force transmission structure 49 can be a force transmission rib / plate, and its lower end is connected to the rear longitudinal beam 2. The second reinforcing rib 47 and the diagonal reinforcing rib 48 are respectively connected to the reinforcing force transmission structure 49 to achieve force distribution and reduce stress concentration at the connection between the support body 41 and the rear longitudinal beam 2.

[0107] Since the rear wheel cover 5 and the rear shock absorber seat 4 are separate structures, compared with the integrated structure, when the shock absorber vibrates up and down, the amount of vibration transmitted from the shock absorber to the rear wheel cover 5 is much less, which can reduce the sheet metal thickness of the rear wheel cover 5 and help save costs.

[0108] The main transmission path of vibration force in a shock absorber is as follows:

[0109] The stress generated by the back-and-forth swaying or vibration is mainly transmitted to the shock absorber mounting plate 45 by the longitudinal stiffener 453, and then to the rear shock absorber seat 4. The rear shock absorber seat 4 has a large front-to-back dimension, which is sufficient to bear the load stress in the front-to-back direction.

[0110] The stress generated by left-right swaying or vibration is partly transmitted to the rear longitudinal beam 2 by the transverse stiffeners 452 and the first stiffener 46 in an inward and downward direction, so that this part of the force is not directly transmitted vertically downward, which can reduce the vertical stress load on the stress-bearing section of the rear longitudinal beam 2; another part is transmitted downward by the transverse stiffeners 452 and the second stiffener 47, part of which is dispersed and transmitted to the rear longitudinal beam 2 by the reinforcing force transmission structure 49, and part of which is transmitted to the rear longitudinal beam 2 by the diagonal stiffeners 48 in a downward and forward or downward and backward direction, so that this part of the force is not directly transmitted vertically downward, which can reduce the vertical stress load on the stress-bearing section of the rear longitudinal beam 2 and facilitate the diffusion and transmission of the guiding force along the extension direction of the rear longitudinal beam 2, reducing the stress concentration at the connection between the rear longitudinal beam 2 and the support body 41.

[0111] The front and rear two diagonal reinforcing ribs 48 on the outer side of each support body 41 are symmetrically arranged so that the force transmitted by the diagonal reinforcing ribs 48 will not be concentrated in the middle area of ​​the rear longitudinal beam 2, but will spread out along the front and rear directions of the rear longitudinal beam 2 respectively.

[0112] In one embodiment, such as Figure 11 and Figure 15 As shown, the reinforcing force transmission structure 49 includes a longitudinal reinforcing plate 491 located on the outside of the support body 41 and extending back and forth, and a third reinforcing rib 492 connected to the longitudinal reinforcing plate 491.

[0113] The longitudinal reinforcing plate 491 is connected to the inner plate 43 of the support and the top plate 201 of the longitudinal beam of the rear longitudinal beam 2 by a third reinforcing rib 492.

[0114] The lower end of the second reinforcing rib 47 is connected to the longitudinal reinforcing plate 491, and the upper end of the oblique reinforcing rib 48 is connected to the longitudinal reinforcing plate 491.

[0115] In this embodiment, the reinforced force transmission structure 49 includes at least one longitudinal reinforcing plate 491 and several third reinforcing ribs 492. The longitudinal reinforcing plate 491 is integrally formed on the outside of the support body 41 and extends front and rear, and is basically parallel to the top plate 201 of the rear longitudinal beam 2. At least one third reinforcing rib 492 is connected between the longitudinal reinforcing plate 491 and the inner plate 43 of the support, and at least one third reinforcing rib 492 is connected between the longitudinal reinforcing plate 491 and the top plate 201 of the longitudinal beam. The two downwardly arranged third reinforcing ribs 492 are roughly flush and converge on the reinforcing column 493 of the longitudinal reinforcing plate 491.

[0116] The lower end of the second reinforcing rib 47 is connected to the longitudinal reinforcing plate 491, which can transfer the force to the longitudinal reinforcing plate 491. The upper third reinforcing rib 492 can also transfer the force to the longitudinal reinforcing plate 491. The longitudinal reinforcing plate 491 then transfers the force to the longitudinal beam top plate 201 through the lower third reinforcing rib 492. A part of the force is also obliquely transferred to the longitudinal beam top plate 201 through the diagonal reinforcing rib 48, playing a good role in stress diffusion and transfer and avoiding stress concentration.

[0117] In one embodiment, as Figure 13 and Figure 15 shown, multiple groups of longitudinal beam reinforcing rib structures 203 are provided between the longitudinal beam top plate 201 and the longitudinal beam bottom plate 202 of the rear longitudinal beam 2.

[0118] The longitudinal beam reinforcing rib structure 203 includes a central column 2031 and multiple longitudinal beam reinforcing ribs 2032 connected to the central column 2031 and arranged in a radial pattern.

[0119] Among the multiple longitudinal beam reinforcing ribs 2032 of each group of longitudinal beam reinforcing rib structures 203, at least two longitudinal beam reinforcing ribs 2032 are connected to the longitudinal beam top plate 201, at least two longitudinal beam reinforcing ribs 2032 are connected to the longitudinal beam bottom plate 202, and at least one longitudinal beam reinforcing rib 2032 is in the same extending direction as the rear longitudinal beam 2.

[0120] Among any two adjacent groups of longitudinal beam reinforcing rib structures 203, the front and rear adjacent two longitudinal beam reinforcing ribs 2032 are connected to each other.

[0121] In this embodiment, the rear longitudinal beam 2 is U-shaped with its opening facing outward. The rear longitudinal beam 2 includes a longitudinal beam inner side plate, a longitudinal beam top plate 201, and a longitudinal beam bottom plate 202. Multiple groups of longitudinal beam reinforcing rib structures 203 are sequentially connected between the longitudinal beam top plate 201 and the longitudinal beam bottom plate 202, and the front and rear adjacent two groups of longitudinal beam reinforcing rib structures 203 are connected to transfer and diffuse the force sequentially along the extending direction of the longitudinal beam.

[0122] The longitudinal beam reinforcing rib structure 203 is generally in a cross shape, and it includes a central column 2031 and multiple longitudinal beam reinforcing ribs 2032. The multiple longitudinal beam reinforcing ribs 2032 are integrally connected around the central column 2031 and arranged in a radial pattern. The central column 2031 is integrally connected to the longitudinal beam inner side plate.

[0123] Among the multiple longitudinal beam reinforcing ribs 2032 of each group of longitudinal beam reinforcing rib structures 203, it includes two obliquely extending longitudinal beam reinforcing ribs 2032 above the diagonal of the central column 2031, two obliquely extending longitudinal beam reinforcing ribs 2032 below the diagonal of the central column 2031, and two longitudinal beam reinforcing ribs 2032 (which can also be called main ribs) on the front and rear sides of the central column 2031 and in the same extending direction as the rear longitudinal beam 2.

[0124] The two inclined longitudinal beam reinforcing bars 2032 located above the central column 2031 are integrally connected to the top plate 201 of the longitudinal beam, and the two inclined longitudinal beam reinforcing bars 2032 located below the central column 2031 are integrally connected to the bottom plate 202 of the longitudinal beam.

[0125] In the two adjacent sets of longitudinal beam reinforcing rib structures 203, the longitudinal beam reinforcing ribs 2032 extending in the same direction as the rear longitudinal beam 2 are connected in sequence. The two longitudinal beam reinforcing ribs 2032 that are adjacent to each other and connected to the top plate 201 of the longitudinal beam are integrally connected, and the two longitudinal beam reinforcing ribs 2032 that are adjacent to each other and connected to the bottom plate 202 of the longitudinal beam are integrally connected, so that there are several triangular structures between the top plate 201 and the bottom plate 202 of the longitudinal beam, which not only improves the structural strength, but also facilitates the diffusion of force.

[0126] In one embodiment, such as Figure 15 As shown, multiple top plate reinforcing columns 2011 are provided at intervals on the top plate 201 of the longitudinal beam.

[0127] In each group of longitudinal beam reinforcing bars structure 203, two longitudinal beam reinforcing bars 2032 are connected to two adjacent top plate reinforcing columns 2011 respectively.

[0128] The lower ends of the reinforced force transmission structure 49 and the diagonal reinforcing rib 48 are respectively connected to the two top plate reinforcing columns 2011.

[0129] In this embodiment, a top plate reinforcing column 2011 is integrally provided at each intersection of the longitudinal beam top plate 201. The longitudinal beam reinforcing rib 2032 connected to the longitudinal beam top plate 201 is connected to the top plate reinforcing column 2011. The lower ends of the reinforcing force transmission structure 49 and the oblique reinforcing rib 48 are respectively connected to the top plate reinforcing column 2011, which improves the structural strength of the longitudinal beam top plate 201 and prevents the intersection of the longitudinal beam top plate 201 from bending due to stress concentration.

[0130] In one embodiment, such as Figure 8-9 and Figure 15 As shown, the bottom surface of the longitudinal beam base plate 202 is provided with a shock-absorbing spring mounting plate 10, and at least two longitudinal beam reinforcing ribs 2032 are connected directly above the shock-absorbing spring mounting plate 10.

[0131] The damping spring mounting plate 10 is used to mount and position the upper end of the damping spring. The top surface of the longitudinal beam bottom plate 202 at the location of the damping spring mounting plate 10 has two longitudinal beam reinforcing ribs 2032 to improve the structural strength of the area where the damping spring mounting plate 10 is mounted.

[0132] In one embodiment, such as Figure 4 , Figure 8-9 and Figure 13-14As shown, the rear longitudinal beam 2 includes a horizontally extending rear longitudinal beam main beam 21, a rear longitudinal beam transition beam 22 connected to the front end of the rear longitudinal beam main beam 21 and extending downwardly, and a rear longitudinal beam secondary beam 23 connected to the front end of the rear longitudinal beam transition beam 22 and extending horizontally.

[0133] The bottom surface of the rear longitudinal beam transition beam 22 is provided with a front mounting platform 24 that extends rearward and is used to install the subframe, and the bottom surface of the rear end of the rear longitudinal beam main beam 21 is provided with a rear mounting platform 25 for installing the subframe.

[0134] A vertically extending rear floor intermediate beam 26 is connected between the front ends of the two rear longitudinal transition beams 22. The front mounting platform 24 is connected to the rear floor intermediate beam 26, and the platform surface of the front mounting platform 24 is located between the upper and lower ends of the rear floor intermediate beam 26.

[0135] The rear longitudinal beam sub-beam 23 is provided with cross-arranged sub-beam reinforcing ribs 231, and the platform surface of the front mounting platform 24 is located between the upper and lower ends of the sub-beam reinforcing ribs 231.

[0136] In this embodiment, along the rear-to-front direction, the rear longitudinal beam 2 includes a rear longitudinal beam main beam 21, a rear longitudinal beam transition beam 22, and a rear longitudinal beam secondary beam 23 connected in sequence. The rear longitudinal beam main beam 21 and the rear longitudinal beam secondary beam 23 extend horizontally, with the rear longitudinal beam secondary beam 23 being lower than the rear longitudinal beam main beam 21. The rear longitudinal beam transition beam 22 is obliquely connected between the rear longitudinal beam secondary beam 23 and the rear longitudinal beam main beam 21.

[0137] A front mounting platform 24 is provided on the bottom surface of the rear longitudinal beam transition beam 22 for mounting the front end of the subframe (rear subframe). The front mounting platform 24 extends rearward from the front end of the rear longitudinal beam transition beam 22, and its platform surface is approximately horizontal. A rear mounting platform 25 is provided on the bottom surface of the rear end of the rear longitudinal beam main beam 21 for mounting the rear end of the subframe (rear subframe). The platform surface of the rear mounting platform 25 is approximately horizontal. The rear mounting platform 25 is higher than the front mounting platform 24.

[0138] A rear floor intermediate beam 26, also known as a reinforcing beam, is connected between the front ends of the two rear longitudinal transition beams 22, which serves to strengthen the structure.

[0139] To prevent stress concentration and subsequent fracture at the connection between the longitudinal transition beam 22 and the rear longitudinal sub-beam 23 when the rear impact force is transmitted forward, the following solution is adopted:

[0140] The bottom surface of the rear floor intermediate beam 26 is approximately flush with or slightly protrudes downward from the bottom surface of the rear longitudinal sub-beam 23. The front mounting platform 24 is connected to the rear floor intermediate beam 26, and the platform surface (bottom surface) of the front mounting platform 24 is above the lower edge of the rear floor intermediate beam 26. Simultaneously, the rear longitudinal sub-beam 23 is provided with cross-arranged sub-beam reinforcing ribs 231, which are integrally connected to the rear floor intermediate beam 26. The height or thickness of the sub-beam reinforcing ribs 231 is greater than that of the front mounting platform 24. Part of the sub-beam reinforcing ribs 231 is above the platform surface (bottom surface) of the front mounting platform 24, and the other part is below the platform surface (bottom surface), thus ensuring the structural stability of the connection between the rear floor intermediate beam 26 and the longitudinal transition beam 22 and the rear longitudinal sub-beam 23, preventing shear force from severing this connection point in the event of a rear-end collision.

[0141] In one embodiment, such as Figure 7-8 As shown, the floor beam 3 includes a front beam 31 connected between the front ends of the two rear longitudinal beams 23 and a rear beam 32 connected between the rear ends of the two rear longitudinal beams 21.

[0142] The rear floor 1 includes a rear floor body 11 connected between two rear longitudinal main beams 21 and a rear floor transition plate 12 connected between two rear longitudinal transition beams 22. The rear end of the rear floor body 11 is connected to the rear crossbeam 32.

[0143] The front crossbeam 31 is provided with multiple front crossbeam reinforcing ribs 311, the rear crossbeam 32 is provided with bent and extended rear crossbeam reinforcing ribs 321, and the bottom surface of the rear floor transition plate 12 is provided with transition plate reinforcing ribs 121 arranged in a cross or mesh pattern.

[0144] In this embodiment, the floor beam 3 includes a front beam 31 and a rear beam 32. The front beam 31 is integrally connected between the front ends of the two rear longitudinal secondary beams 23, and the rear beam 32 is integrally connected between the rear ends of the two rear longitudinal main beams 21, forming a frame structure with structural stability. A frame structure is formed between the front ends of the rear floor 1. The rear floor panel 9 is installed on the frame structure formed by the front beam 31, the two rear longitudinal secondary beams 23, and the rear floor intermediate beam 26. A reinforcing sheet metal part 91 is connected to the outside of the rear longitudinal secondary beams 23, and the reinforcing sheet metal part 91 can be used to connect with the sill beam.

[0145] The rear floor 1 accordingly includes a rear floor body 11 and a rear floor transition plate 12. The rear floor body 11 is generally horizontally arranged, and its bottom surface is provided with main body reinforcing ribs to improve the structural strength of the rear floor body 11. The rear floor transition plate 12 is arranged at an angle, which is adapted to the rear longitudinal beam transition beam 22. The bottom surface of the rear floor transition plate 12 is provided with transition plate reinforcing ribs 121 arranged in a cross pattern or in a mesh pattern to improve the structural strength of the rear floor transition plate 12.

[0146] The rear floor main body 11 is integrally connected between the two rear longitudinal main beams 21, and its rear end is integrally connected to the rear crossbeam 32. The rear floor transition plate 12 is integrally connected between the two rear longitudinal transition beams 22, and its front end is integrally connected to the rear floor intermediate beam 26. The front crossbeam 31 is provided with multiple front crossbeam reinforcing ribs 311 to improve the structural strength of the front crossbeam 31. The rear crossbeam 32 is provided with bent and extended rear crossbeam reinforcing ribs 321 to improve the structural strength of the rear crossbeam 32.

[0147] In one embodiment, such as Figure 14 and Figure 17 As shown, the front mounting platform 24 is provided with a first mounting hole 241 and two first weight reduction holes 242. The two first weight reduction holes 242 are located on the side of the first mounting hole 241 near the rear floor transition plate 12. The two first weight reduction holes 242 are separated by a first partition 243. The first partition 243 extends from the first mounting hole 241 toward the rear floor transition plate 12.

[0148] The transition plate reinforcing rib 121 has a first reinforcing rib 1211 that is coplanar with the first rib 243, and the first reinforcing rib 1211 is connected to the side of the front mounting platform 24.

[0149] In this embodiment, the first mounting hole 241 can be an internally threaded hole, located outside the two first weight-reducing holes 242. The first mounting hole 241 is used for bolt connection with the front mounting point of the subframe. The first weight-reducing holes 242 are used to reduce structural weight and also to transmit force through the intermediate first rib 243, rather than transmitting all the force of the front mounting point of the subframe to the side of the front mounting platform 24.

[0150] Preferably, the first rib 243 is located approximately on a diameter extending in the left-right direction of the first mounting hole 241.

[0151] The transition plate reinforcing rib 121 has a first reinforcing rib 1211, which is coplanar with the first partition rib 243 and the two can be connected integrally. In this way, the first partition rib 243 can mainly transfer the force of the front mounting point of the subframe to the first reinforcing rib 1211, and then spread it through the transition plate reinforcing rib 121. No stress concentration will occur on the side of the front mounting platform 24.

[0152] In one embodiment, such as Figure 16 As shown, the rear mounting platform 25 is provided with a second mounting hole 251 and two second weight reduction holes 252. The two second weight reduction holes 252 are located on the side of the second mounting hole 251 near the rear crossbeam 32. The two second weight reduction holes 252 are separated by a second partition 253. The second partition 253 extends from the second mounting hole 251 toward the rear crossbeam 32.

[0153] The rear crossbeam reinforcing bar 321 has a second reinforcing bar 3211 that is coplanar with the second diaphragm bar 253, and the second reinforcing bar 3211 is connected to the side of the rear mounting platform 25.

[0154] In this embodiment, the second mounting hole 251 can be an internally threaded hole, located outside the two second weight-reducing holes 252. The second mounting hole 251 is used for bolt connection with the rear mounting point of the subframe. The second weight-reducing holes 252 are used to reduce structural weight and also to transmit force through the intermediate second rib 253, rather than transmitting all the force of the rear mounting point of the subframe to the side of the rear mounting platform 25.

[0155] Preferably, the second rib 253 is located approximately on a diameter extending in the left-right direction of the second mounting hole 251.

[0156] The rear crossbeam reinforcing rib 321 has a second reinforcing plate rib 3211, which is coplanar with the second partition rib 253 and the two can be connected integrally. In this way, the second partition rib 253 can mainly transfer the force of the rear mounting point of the subframe to the second reinforcing plate rib 3211, and then spread and transfer it through the rear crossbeam reinforcing rib 321 in sequence, so that stress concentration will not occur on the side of the rear mounting platform 25.

[0157] In one embodiment, such as Figure 5-6 As shown, the rear longitudinal beam 2 and the rear shock absorber seat 4 are connected to the side of the flange frame 6, and the edge of the rear wheel cover 5 is connected to the flange frame 6.

[0158] In this embodiment, a flanged frame 6 is provided, which can be glued to the side of the die-cast part, for example, to the side of the rear longitudinal beam 2 and the rear shock absorber seat 4. The edge of the rear wheel cover 5 contacts the flanged frame 6 and is then connected to the die-cast part by rivets, bolts, etc., to avoid direct contact between the sheet metal rear wheel cover 5 and the die-cast part, and also to avoid wear on the die-cast part when bolting or riveting.

[0159] In one embodiment, such as Figure 1-7 , Figure 12 and Figure 18 As shown, the rear wheel arch 5 is connected to a C-pillar connector 51 for connecting to the C-pillar of the vehicle and a D-pillar connector 52 for connecting to the D-pillar of the vehicle. The lower ends of the C-pillar connector 51 and the D-pillar connector 52 are integrally connected and assembled in the mounting groove 44.

[0160] In this embodiment, the rear wheel arch 5 is connected to a C-pillar connector 51 and a D-pillar connector 52. The C-pillar connector 51 and the D-pillar connector 52 are roughly Y-shaped. The D-pillar connector 52 is located behind the C-pillar connector 51. The C-pillar connector 51 is used to connect with the C-pillar of the vehicle, and the D-pillar connector 52 is used to connect with the D-pillar of the vehicle, so as to form a closed loop structure on the side of the vehicle body and improve the structural strength of the vehicle body.

[0161] The lower ends of the C-pillar connector 51 and the D-pillar connector 52 are connected together and attached to the inner surface of the rear wheel arch 5.

[0162] When the rear wheel cover 5 is assembled onto the rear shock absorber mount 4, the lower ends of the C-pillar connector 51 and the D-pillar connector 52 are assembled in the mounting groove 44, which serves as a positioning tool and also enhances structural stability.

[0163] In one embodiment, such as Figure 1-2 and Figure 19-22 As shown, the vehicle's rear floor structure includes a rear bumper beam assembly 7.

[0164] The rear bumper beam assembly 7 includes a rear bumper beam 71 and two sheet metal energy-absorbing boxes 72 connected to the rear side of the rear bumper beam 71. The surface of the sheet metal energy-absorbing box 72 is provided with multiple spaced crumple grooves 721.

[0165] The rear end of the rear longitudinal beam 2 is connected to an extension beam 27, and the rear end of the extension beam 27 is provided with an extension beam connecting plate 273. The front end of the sheet metal energy-absorbing box 72 is provided with an energy-absorbing box connecting plate 73, and the energy-absorbing box connecting plate 73 is connected to the extension beam connecting plate 273.

[0166] In this embodiment, the energy-absorbing box is a sheet metal energy-absorbing box 72, with several crumple grooves 721 provided on its outer surface. When a rear-end collision occurs, the relatively weak crumple grooves 721 guide the sheet metal energy-absorbing box 72 to crumple and absorb energy, resulting in good energy absorption. The sheet metal energy-absorbing box 72 has higher structural strength than conventional aluminum boxes, enabling a secure connection between the extension beam 27 and the rear anti-collision beam 71.

[0167] The sheet metal energy-absorbing box 72 has a rear connecting plate 74 at its rear end, which is connected to the rear anti-collision beam 71 by bolts. The rear anti-collision beam 71 is a tubular structure with a through hole on its rear side aligned with the bolt, for inserting tools to tighten nuts, facilitating operation.

[0168] The front end of the sheet metal energy-absorbing box 72 is provided with an energy-absorbing box connecting plate 73, and the rear end of the extension beam 27 is provided with an extension beam connecting plate 273. The extension beam connecting plate 273 surrounds the extension beam 27, and the energy-absorbing box connecting plate 73 and the extension beam connecting plate 273 are fastened together by bolts.

[0169] The extension beam 27 is an aluminum extrusion part, while the extension beam connecting plate 273, the energy-absorbing box, the energy-absorbing box connecting plate 73, and the rear anti-collision beam 71 are all sheet metal parts.

[0170] In one embodiment, such as Figure 20-21 As shown, the rear end of the rear longitudinal beam 2 is provided with a mounting groove 211. The inner surface of the groove wall of the mounting groove 211 is provided with multiple protruding ribs 212 at intervals.

[0171] The extension beam 27 includes a square tube 271 and a cross-shaped reinforcing rib 272 provided in the square tube 271. The outer surface of the square tube 271 is provided with a collision energy absorption recess 274.

[0172] The front end of the extension beam 27 is interference-fitted in the mounting groove 211, and the groove wall is connected to the square tube 271 by fasteners.

[0173] In this embodiment, an installation groove 211 is provided at the rear end of the rear longitudinal beam 21, and a number of protruding ribs 212 are provided at intervals on the inner surface of the groove wall for interference fit with the extension beam 27. Installation holes 213 are provided on the groove walls on the left and right sides for bolts to pass through and connect.

[0174] The extension beam 27 is a square tube structure, comprising a square tube body 271 and a cross-shaped reinforcing rib 272. The cross-shaped reinforcing rib 272 is integrally formed within the square tube body 271, serving to strengthen the structure. Impact energy-absorbing recesses 274 are provided on the outer surface of the square tube body 271. These recesses are located on the corner lines of the square tube body 271 or at the junction lines of two plates. When the square tube body 271 is subjected to excessive force, the impact energy-absorbing recesses 274 collapse under the stress, thus absorbing energy.

[0175] The front end of the square tube 271 is provided with rivet nuts on both sides. The front end of the square tube 271 is interference-fitted into the mounting groove 211, and then the groove wall is connected to the square tube 271 by bolts.

[0176] In one embodiment, such as Figure 3-4 and Figure 6 As shown, the vehicle's rear floor structure includes a luggage compartment shell 8, which is connected between the rear end of the rear floor 1 and two extension beams 27.

[0177] An L-shaped inner plate 28 and an L-shaped outer plate 29 are connected to the extension beam 27.

[0178] The inner vertical plate 281 of the L-shaped inner plate 28 is located inside the extension beam 27 and is connected to the luggage compartment shell 8, while the inner flat plate 282 is connected to the top surface of the extension beam 27.

[0179] The outer vertical plate 291 of the L-shaped outer plate 29 is located outside the extension beam 27 and is connected to the rear wheel cover 5. The outer flat plate 292 of the L-shaped outer plate 29 is connected to the top surface of the extension beam 27.

[0180] In this embodiment, a recessed or L-shaped suitcase shell 8 is connected between the rear end of the rear floor 1 and the two extension beams 27.

[0181] Each extension beam 27 is connected to an L-shaped inner plate 28 and an L-shaped outer plate 29. The L-shaped inner plate 28 includes an inner vertical plate 281 and an inner flat plate 282, and the L-shaped outer plate 29 includes an outer vertical plate 291 and an outer flat plate 292. Here, "vertical plate" refers to a plate arranged approximately vertically, and "flat plate" refers to a plate arranged approximately horizontally.

[0182] The inner vertical plate 281 is located inside the extension beam 27 and connected to the luggage compartment shell 8, while the inner flat plate 282 is connected to the top surface of the extension beam 27. The outer vertical plate 291 is located outside the extension beam 27 and connected to the rear wheel arch 5, while the outer flat plate 292 is also connected to the top surface of the extension beam 27, with a portion of the outer flat plate 292 overlapping the inner flat plate 282. This arrangement establishes a connection between the rear wheel arch 5, the extension beam 27, and the luggage compartment shell 8, further enhancing structural stability.

[0183] In one embodiment, a portion of the outer plate 292 is stacked on top of the inner plate 282, and there is a preset gap between the outer plate 292 and the inner plate 282 to allow sufficient space for electrophoresis in the area, thereby improving the rust prevention effect.

[0184] In one embodiment, such as Figure 23 As shown, the bottom surface of the rear longitudinal beam sub-beam 23 is provided with multiple fourth reinforcing ribs 232 extending along the width direction, at least one fifth reinforcing rib 233 extending along the front-rear direction, and at least one sixth reinforcing rib 234 extending backward and inward.

[0185] At least one fourth reinforcing rib 232 is connected to the front crossbeam 31. A fifth reinforcing rib 233 is connected to the fourth reinforcing rib 232, and the rear end of the fifth reinforcing rib 233 is connected to the front mounting platform 24.

[0186] The sixth reinforcing rib 234 is connected to the fourth reinforcing rib 232 and the fifth reinforcing rib 233 respectively. The rear end of the sixth reinforcing rib 234 is connected to the front mounting platform 24, and the sixth reinforcing rib 234 is flush with the inner edge 240 of the front mounting platform 24.

[0187] In this embodiment, a cross-shaped reinforcing rib is provided on the bottom surface of the rear longitudinal beam sub-beam 23, including multiple fourth reinforcing ribs 232, at least one fifth reinforcing rib 233 and at least one sixth reinforcing rib 234.

[0188] The fourth reinforcing rib 232 extends along the width direction of the rear longitudinal sub-beam 23, that is, along the Y-direction of the vehicle. At least one fourth reinforcing rib 232 is connected to the front crossbeam 31.

[0189] The fifth reinforcing rib 233 extends along the longitudinal direction of the rear longitudinal sub-beam 23, that is, along the X-direction of the vehicle. The fifth reinforcing rib 233 is connected to one or more fourth reinforcing ribs 232, and the rear end of the fifth reinforcing rib 233 is connected to the front mounting platform 24.

[0190] The sixth reinforcing rib 234 extends obliquely, tilting rearward and inward. The oblique extension direction of the sixth reinforcing rib 234 is consistent with the tilt of the front mounting platform 24. The sixth reinforcing rib 234 is connected to each of the fourth reinforcing ribs 232 and also to the fifth reinforcing rib 233. The rear end of the sixth reinforcing rib 234 is connected to and flush with the inner edge 240 of the front mounting platform 24.

[0191] In the event of a side impact, the fourth reinforcing rib 232 transmits force along the Y direction, and part of the force is transferred to the front crossbeam 31. At the same time, the fifth reinforcing rib 233 transmits force along the X direction, transferring the force to the rear through the rear longitudinal beam 2. Meanwhile, part of the force is also transferred to the rear and inward through the sixth reinforcing rib 234. This achieves the dispersion and transmission of the side impact force, avoids stress concentration, and improves the stability of the connection structure.

[0192] As needed, the above technical solutions can be combined to achieve the best technical effect.

[0193] The above are merely the principles and preferred embodiments of the present invention. It should be noted that, for those skilled in the art, several other modifications can be made based on the principles of the present invention, and these modifications should also be considered within the scope of protection of the present invention.

Claims

1. A vehicle rear floor structure characterized by, Includes a die-cast part and a rear wheel cover (5) connected to the die-cast part; The die-cast component includes an integrally formed rear floor (1), rear longitudinal beam (2), floor crossbeam (3) and rear shock absorber seat (4), wherein the rear shock absorber seat (4) is integrally mounted on the rear longitudinal beam (2); The rear wheel cover (5) is connected to the rear longitudinal beam (2) and the rear shock absorber seat (4) respectively; The rear shock absorber seat (4) includes a bracket body (41) connected to the rear longitudinal beam (2) and a bracket outer plate (42) and a bracket inner plate (43) connected to the bracket body (41). The bracket outer plate (42) and the bracket inner plate (43) are connected and form an assembly groove (44) for assembling the components of the rear wheel cover (5). The bottom plate of the assembly slot (44) is a shock absorber mounting plate (45) for connecting the shock absorber. The top surface of the shock absorber mounting plate (45) is provided with an internal thread sleeve (451). The periphery of the internal thread sleeve (451) and the shock absorber mounting plate (45) are connected with transverse reinforcing ribs (452) and longitudinal reinforcing ribs (453). The inner plate (43) of the bracket and / or the inner side of the bracket body (41) are provided with a first reinforcing rib (46) extending inward and downward at an incline, and the outer side of the bracket body (41) is provided with a second reinforcing rib (47) extending downward. The first reinforcing rib (46), the transverse reinforcing rib (452) and the second reinforcing rib (47) are arranged in the same plane and integrally formed. The lower end of the first reinforcing rib (46) is connected to the rear longitudinal beam (2) and / or the rear floor (1), and the lower end of the second reinforcing rib (47) is connected to the rear longitudinal beam (2) through an oblique reinforcing rib (48). The outer side of the support body (41) is provided with a reinforcing force transmission structure (49) connected to the rear longitudinal beam (2), and the second reinforcing rib (47) and the diagonal reinforcing rib (48) are respectively connected to the reinforcing force transmission structure (49).

2. The vehicle rear floor structure according to claim 1, characterized in that, The reinforced force transmission structure (49) includes a longitudinal reinforcing plate (491) located on the outside of the support body (41) and extending back and forth, and a third reinforcing rib (492) connected to the longitudinal reinforcing plate (491). The longitudinal reinforcing plate (491) is connected to the inner plate (43) of the bracket and the top plate (201) of the longitudinal beam of the rear longitudinal beam (2) by the third reinforcing rib (492). The lower end of the second reinforcing rib (47) is connected to the longitudinal reinforcing plate (491), and the upper end of the oblique reinforcing rib (48) is connected to the longitudinal reinforcing plate (491).

3. The vehicle rear floor structure according to claim 1 or 2, characterized in that, Multiple sets of longitudinal beam reinforcing rib structures (203) are provided between the top plate (201) and the bottom plate (202) of the rear longitudinal beam (2). The longitudinal beam reinforcing structure (203) includes a central column (2031) and multiple radially arranged longitudinal beam reinforcing ribs (2032) connected to the central column (2031). In each set of longitudinal beam reinforcing rib structures (203), among the multiple longitudinal beam reinforcing ribs (2032), at least two longitudinal beam reinforcing ribs (2032) are connected to the top plate (201) of the longitudinal beam, at least two longitudinal beam reinforcing ribs (2032) are connected to the bottom plate (202) of the longitudinal beam, and at least one longitudinal beam reinforcing rib (2032) has the same extension direction as the rear longitudinal beam (2); In any two adjacent sets of longitudinal beam stiffener structures (203), the two longitudinal beam stiffeners (2032) that are adjacent to each other are connected to each other.

4. The vehicle rear floor structure according to claim 3, characterized in that, Multiple top plate reinforcing columns (2011) are provided at intervals on the top plate (201) of the longitudinal beam. In each set of longitudinal beam reinforcing rib structures (203), two of the longitudinal beam reinforcing ribs (2032) are connected to two adjacent top plate reinforcing columns (2011); The lower ends of the reinforced force transmission structure (49) and the oblique reinforcing rib (48) are respectively connected to the two top plate reinforcing columns (2011).

5. The vehicle rear floor structure according to claim 3, characterized in that, The bottom surface of the longitudinal beam base plate (202) is provided with a shock-absorbing spring mounting plate (10), and at least two longitudinal beam reinforcing ribs (2032) are connected directly above the shock-absorbing spring mounting plate (10).

6. The vehicle rear floor structure according to claim 1, characterized in that, The rear longitudinal beam (2) includes a horizontally extending rear longitudinal beam main beam (21), a rear longitudinal beam transition beam (22) connected to the front end of the rear longitudinal beam main beam (21) and extending downwardly, and a rear longitudinal beam secondary beam (23) connected to the front end of the rear longitudinal beam transition beam (22) and extending horizontally. The bottom surface of the rear longitudinal beam transition beam (22) is provided with a front mounting platform (24) that extends rearward and is used to install the subframe, and the bottom surface of the rear end of the rear longitudinal beam main beam (21) is provided with a rear mounting platform (25) for installing the subframe. A vertically extending rear floor intermediate beam (26) is connected between the front ends of the two rear longitudinal transition beams (22). The front mounting platform (24) is connected to the rear floor intermediate beam (26), and the platform surface of the front mounting platform (24) is located between the upper and lower ends of the rear floor intermediate beam (26). The rear longitudinal beam sub-beam (23) is provided with cross-arranged sub-beam reinforcing ribs (231), and the platform surface of the front mounting platform (24) is located between the upper and lower ends of the sub-beam reinforcing ribs (231).

7. The vehicle rear floor structure according to claim 6, characterized in that, The floor beam (3) includes a front beam (31) connected between the front ends of the two rear longitudinal beam sub-beams (23) and a rear beam (32) connected between the rear ends of the two rear longitudinal beam main beams (21). The rear floor (1) includes a rear floor body (11) connected between two rear longitudinal main beams (21) and a rear floor transition plate (12) connected between two rear longitudinal transition beams (22). The rear end of the rear floor body (11) is connected to the rear crossbeam (32). The front crossbeam (31) is provided with multiple front crossbeam reinforcing ribs (311), the rear crossbeam (32) is provided with bent and extended rear crossbeam reinforcing ribs (321), and the bottom surface of the rear floor transition plate (12) is provided with transition plate reinforcing ribs (121) arranged in a cross or in a mesh pattern.

8. The vehicle rear floor structure according to claim 7, characterized in that, The front mounting platform (24) is provided with a first mounting hole (241) and two first weight-reducing holes (242). The two first weight-reducing holes (242) are located on the side of the first mounting hole (241) close to the rear floor transition plate (12). The two first weight-reducing holes (242) are separated by a first partition (243). The first partition (243) extends from the first mounting hole (241) toward the rear floor transition plate (12). The transition plate reinforcing rib (121) has a first reinforcing rib (1211) that is coplanar with the first partition rib (243), and the first reinforcing rib (1211) is connected to the side of the front mounting platform (24).

9. The vehicle rear floor structure according to claim 7, characterized in that, The rear mounting platform (25) is provided with a second mounting hole (251) and two second weight-reducing holes (252). The two second weight-reducing holes (252) are located on the side of the second mounting hole (251) close to the rear crossbeam (32). The two second weight-reducing holes (252) are separated by a second partition (253). The second partition (253) extends from the second mounting hole (251) toward the rear crossbeam (32). The rear crossbeam reinforcing bar (321) has a second reinforcing plate (3211) that is coplanar with the second partition bar (253), and the second reinforcing plate (3211) is connected to the side of the rear mounting platform (25).

10. The vehicle rear floor structure according to claim 1, characterized in that, The rear longitudinal beam (2) and the rear shock absorber seat (4) are connected to the side of the flange frame (6), and the edge of the rear wheel cover (5) is connected to the flange frame (6).

11. The vehicle rear floor structure according to claim 1, characterized in that, The rear wheel arch (5) is connected to a C-pillar connector (51) for connecting to the C-pillar of the vehicle and a D-pillar connector (52) for connecting to the D-pillar of the vehicle. The lower ends of the C-pillar connector (51) and the D-pillar connector (52) are integrally connected and assembled in the assembly groove (44).

12. The vehicle rear floor structure according to claim 1, characterized in that, The vehicle rear floor structure includes a rear anti-collision beam assembly (7). The rear bumper beam assembly (7) includes a rear bumper beam (71) and two sheet metal energy-absorbing boxes (72) connected to the rear side of the rear bumper beam (71). The surface of the sheet metal energy-absorbing box (72) is provided with multiple spaced crumple grooves (721). The rear end of the rear longitudinal beam (2) is connected to an extension beam (27), and the rear end of the extension beam (27) is provided with an extension beam connecting plate (273). The front end of the sheet metal energy-absorbing box (72) is provided with an energy-absorbing box connecting plate (73), and the energy-absorbing box connecting plate (73) is connected to the extension beam connecting plate (273).

13. The vehicle rear floor structure according to claim 12, characterized in that, The rear end of the rear longitudinal beam (2) is provided with an installation groove (211). The inner surface of the groove wall of the mounting groove (211) is provided with multiple protruding ribs (212) at intervals. The extension beam (27) includes a square tube (271) and a cross-shaped reinforcing rib (272) provided in the square tube (271). The outer surface of the square tube (271) is provided with a collision energy-absorbing recess (274). The front end of the extension beam (27) is interference-fitted in the mounting groove (211), and the groove wall is connected to the square tube (271) by fasteners.

14. The vehicle rear floor structure according to claim 12, characterized in that, The vehicle rear floor structure includes a luggage compartment shell (8), which is connected between the rear end of the rear floor (1) and the two extension beams (27). The extension beam (27) is connected to an L-shaped inner plate (28) and an L-shaped outer plate (29); The inner vertical plate (281) of the L-shaped inner plate (28) is located inside the extension beam (27) and connected to the luggage box shell (8), and the inner flat plate (282) of the L-shaped inner plate (28) is connected to the top surface of the extension beam (27); The outer vertical plate (291) of the L-shaped outer plate (29) is located outside the extension beam (27) and connected to the rear wheel cover (5), and the outer flat plate (292) of the L-shaped outer plate (29) is connected to the top surface of the extension beam (27).

15. The vehicle rear floor structure according to claim 14, characterized in that, The outer plate (292) is partially stacked on top of the inner plate (282), and there is a preset gap between the outer plate (292) and the inner plate (282).

16. The vehicle rear floor structure according to claim 7, characterized in that, The bottom surface of the rear longitudinal beam sub-beam (23) is provided with multiple fourth reinforcing ribs (232) extending along the width direction, at least one fifth reinforcing rib (233) extending along the front-rear direction, and at least one sixth reinforcing rib (234) extending backward and inward. At least one of the fourth reinforcing ribs (232) is connected to the front crossbeam (31); The fifth reinforcing rib (233) is connected to the fourth reinforcing rib (232), and the rear end of the fifth reinforcing rib (233) is connected to the front mounting platform (24); The sixth reinforcing rib (234) is connected to the fourth reinforcing rib (232) and the fifth reinforcing rib (233) respectively. The rear end of the sixth reinforcing rib (234) is connected to the front mounting platform (24), and the sixth reinforcing rib (234) is flush with the inner edge (240) of the front mounting platform (24).

Images