Rear floor structure, casting mold

Abstract

The application discloses a rear floor structure and a casting mold. The rear floor structure comprises a rear floor body and a rear floor frame which are integrally cast, the rear floor frame comprises a left longitudinal beam, a right longitudinal beam and a cross beam group, the cross beam group comprises at least two cross beams, the cross beams are connected between the left longitudinal beam and the right longitudinal beam, the longitudinal beam and / or the cross beam is provided with a first groove with an opening downward, and a plurality of reinforcing ribs are arranged in the first groove. The rear floor structure is manufactured by using an integrally casting forming process, so that the self weight of the rear floor structure can be effectively reduced, the overall performance of the rear floor structure is optimized, the production cost of the rear floor structure is reduced, and the production efficiency is improved. By arranging the first groove with the opening downward on the longitudinal beam and / or the cross beam, the bending torsional rigidity and the structural strength of the whole rear floor structure can be effectively improved, and meanwhile, the casting difficulty and the cost of the rear floor structure are reduced.

Description

Technical Field

[0001] This invention relates to the field of vehicle body structure, and in particular to a rear floor structure and a casting mold. Background Technology

[0002] Currently, traditional vehicle rear floor structures are generally manufactured using either stamping sheet metal processing or one-piece die casting molding. Among these, the stamping sheet metal process results in problems such as heavy weight, low connection strength between parts, large production floor space, high manufacturing equipment costs, numerous parts, complex assembly, and large cumulative tolerances. The existing one-piece die casting molding process results in problems such as low bending and torsional stiffness, low stiffness at mounting points, a large number of manufacturing molds, complex mold structures, and difficulty in sealing the mold cavity. Summary of the Invention

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention proposes a rear floor structure that can solve the problems of large self-weight, complex assembly, and large tolerance, while also having the advantages of high bending and torsional stiffness, high stiffness at the installation point, fewer molds used, and simple structure.

[0004] According to an embodiment of the present invention, the rear floor structure includes: an integrally cast rear floor body and a rear floor frame. The rear floor frame includes a left longitudinal beam, a right longitudinal beam, and a beam assembly. The beam assembly includes at least two beams connected between the left longitudinal beam and the right longitudinal beam. At least one of the left longitudinal beam, the right longitudinal beam, and the beam assembly has a first groove with an opening facing downwards. A plurality of reinforcing ribs are provided in the first groove.

[0005] According to the embodiments of the present invention, the rear floor structure is manufactured by an integral casting process, which can effectively reduce the weight of the rear floor structure, optimize the overall performance of the rear floor structure, reduce the production cost of the rear floor structure, and improve the production efficiency. By setting the first groove with the opening facing downward on the longitudinal beams and / or transverse beams, the overall bending and torsional stiffness and structural strength of the rear floor structure can be effectively improved, while reducing the casting difficulty and cost of the rear floor structure.

[0006] In addition, the rear floor structure according to the present invention may also have the following additional technical features:

[0007] In some embodiments, the crossbeam assembly includes a front crossbeam adjacent to the front side of the rear floor body, a rear crossbeam adjacent to the rear side of the rear floor body, and at least one intermediate crossbeam. In the front-rear direction, the intermediate crossbeam is located between the front crossbeam and the rear crossbeam. The reinforcing ribs of the front crossbeam, the rear crossbeam, and the intermediate crossbeam all extend in a zigzag pattern in the left-right direction.

[0008] In some embodiments, the left end of the middle crossbeam has a first intersection point with the left longitudinal beam, the right end of the middle crossbeam has a second intersection point with the right longitudinal beam, the left end of the rear crossbeam has a third intersection point with the left longitudinal beam, and the right end of the rear crossbeam has a fourth intersection point with the right longitudinal beam. The first and second intersection points respectively have a subframe left front mounting seat and a subframe right front mounting seat integrally cast with the rear floor frame, and the third and fourth intersection points respectively have a subframe left rear mounting seat and a subframe right rear mounting seat integrally cast with the rear floor frame.

[0009] In some embodiments, the rear floor structure further includes a left rear shock absorber mount and a right rear shock absorber mount integrally cast with the rear floor frame. The left rear shock absorber mount is located between the subframe left front mount and the subframe left rear mount on the left longitudinal beam, and the right rear shock absorber mount is located between the subframe right front mount and the subframe right rear mount on the right longitudinal beam.

[0010] In some embodiments, the subframe left front mounting seat, the subframe right front mounting seat, the subframe left rear mounting seat, the subframe right rear mounting seat, the left rear shock absorber mounting seat, and the right rear shock absorber mounting seat all have a second groove with an upward opening, and the second groove has radially distributed reinforcing ribs.

[0011] In some embodiments, the stiffeners of the left longitudinal beam and the stiffeners of the right longitudinal beam each include a first stiffener extending in a zigzag pattern along the front-back direction, a second stiffener extending in a zigzag pattern along the front-back direction, and a third stiffener extending in a straight line along the front-back direction. The first stiffener and the second stiffener have multiple stiffener intersection points in the front-back direction, and the third stiffener sequentially connects two adjacent stiffener intersection points in the front-back direction.

[0012] In some embodiments, the rear floor structure further includes a left rear wheel cover and a right rear wheel cover integrally cast with the rear floor body.

[0013] In some embodiments, the left side of the left longitudinal beam is a plane, and the lower end of the left rear wheel arch is connected to the left side of the left longitudinal beam; the right side of the right longitudinal beam is a plane, and the lower end of the right rear wheel arch is connected to the right side of the right longitudinal beam.

[0014] In some embodiments, the angle between the left side of the left longitudinal beam and the horizontal plane is 'a', and the angle between the right side of the right longitudinal beam and the horizontal plane is 'b', satisfying: 85°≤a<90°, 85°≤b<90°.

[0015] In some embodiments, the left rear wheel arch has a plurality of first inner reinforcing ribs extending in a vertical direction on the right side, the lower ends of the first inner reinforcing ribs extending to the rear floor body; the right rear wheel arch has a plurality of second inner reinforcing ribs extending in a vertical direction on the left side, the lower ends of the second inner reinforcing ribs extending to the rear floor body.

[0016] In some embodiments, the rear floor structure is made of aluminum alloy.

[0017] The present invention also proposes a casting mold for the rear floor structure of the above embodiments; comprising: a moving mold and a fixed mold, wherein the moving mold is movably disposed at the upper end of the fixed mold, and a casting space for the rear floor structure is constructed between the moving mold and the fixed mold.

[0018] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the rear floor structure according to an embodiment of the present invention;

[0020] Figure 2 This is a bottom view of the rear floor structure according to an embodiment of the present invention;

[0021] Figure 3 This is a partial schematic diagram of the rear floor structure (bottom) according to an embodiment of the present invention;

[0022] Figure 4 This is a top view of the rear floor structure according to an embodiment of the present invention;

[0023] Figure 5 This is a first partial schematic diagram of the rear floor structure (upper part) according to an embodiment of the present invention;

[0024] Figure 6 This is a second partial schematic diagram of the rear floor structure (upper part) according to an embodiment of the present invention;

[0025] Figure 7 This is a cross-sectional view of the rear floor structure (left-right direction) according to an embodiment of the present invention;

[0026] Figure 8 This is a cross-sectional view of the rear floor structure (front-rear direction) according to an embodiment of the present invention;

[0027] Figure 9 This is a partial cross-sectional view of the right rear shock absorber mounting base of the rear floor structure according to an embodiment of the present invention;

[0028] Figure 10This is a partial cross-sectional view of the right front mounting bracket of the subframe of the rear floor structure according to an embodiment of the present invention.

[0029] Figure label:

[0030] 100. Rear floor structure;

[0031] 1. Rear floor body;

[0032] 2. Rear floor frame; 21. Left longitudinal beam; 22. Right longitudinal beam; 23. Crossbeam assembly; 24. Left front subframe mount; 25. Right front subframe mount; 26. Left rear subframe mount; 27. Right rear subframe mount; 28. Left rear shock absorber mount; 29. ​​Right rear shock absorber mount; 231. Front crossbeam; 232. Rear crossbeam; 233. Intermediate crossbeam;

[0033] 3. First groove; 4. Second groove;

[0034] 5. Left rear wheel cover; 51. First inner reinforcing rib;

[0035] 6. Right rear wheel cover; 61. Second inner reinforcing rib. Detailed Implementation

[0036] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0037] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and do 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. Therefore, they should not be construed as limitations on this invention.

[0038] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0039] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a communication connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0040] The following is for reference. Figures 1-10 A rear floor structure 100 according to an embodiment of the present invention is described.

[0041] like Figures 1 to 10 As shown, the rear floor structure 100 according to an embodiment of the present invention includes: a rear floor body 1 integrally cast and a rear floor frame 2. The rear floor frame 2 includes a left longitudinal beam 21, a right longitudinal beam 22 and a crossbeam group 23. The crossbeam group 23 includes at least two crossbeams connected between the left longitudinal beam 21 and the right longitudinal beam 22. At least one of the left longitudinal beam, the right longitudinal beam and the crossbeam group has a first groove 3 with an opening facing downward. A plurality of reinforcing ribs are provided in the first groove 3.

[0042] In this embodiment, the rear floor structure 100, which is integrally cast, is lightweight and can well meet the requirements of lightweight design. At the same time, since the rear floor structure 100 is integrally cast, it does not have the problems of numerous parts, complex assembly, large cumulative tolerances, and low overall structural strength and bending strength found in the existing stamping sheet metal manufacturing process. In addition, the integral casting process does not require a large number of molds, fixtures, and inspection tools, thereby reducing the cost of manufacturing equipment and management costs, effectively reducing production costs, improving production efficiency, and reducing the production floor space.

[0043] In this embodiment, the longitudinal beam may have a downward-opening first groove 3, or the transverse beam may have a downward-opening first groove 3, or both the longitudinal beam and the transverse beam may have a downward-opening first groove 3. Since the rear floor structure 100 mainly bears the force in the vertical direction of the vehicle, compared with the existing one-piece cast rear floor structure 100, the design of the first groove 3 can effectively improve the bending and torsional stiffness and support of the rear floor structure 100 in the vertical direction of the vehicle. At the same time, multiple reinforcing ribs are set in the first groove 3, which can further improve the strength and stiffness of the longitudinal beam and transverse beam structure, thereby improving the NVH performance of the vehicle and further improving the overall performance of the rear floor structure 100.

[0044] In some embodiments, during the integral die casting process, the design of the first groove 3 can reduce the diversion of the molten metal filling the mold during the flow process, thereby improving the filling capacity of the molten metal in the die casting mold, which significantly improves the mechanical properties of the cast rear floor structure 100 and ensures the production quality of the rear floor structure 100.

[0045] Existing one-piece casting processes often produce rear floor structures with "C"-shaped grooves on the longitudinal and transverse beams that open towards the left and right sides of the vehicle. This increases the diversion of molten metal during the flow process. In addition, a separate casting mold needs to be designed to cast the "C"-shaped grooves, which not only increases the casting difficulty but also increases the casting cost. The rear floor structure design of this embodiment, by designing the first groove 3 with the opening facing downward on the longitudinal and transverse beams, not only can the diversion of molten metal during the flow process be reduced, but also the need for additional casting molds is eliminated, thereby reducing the number of molds and lowering the casting difficulty and cost.

[0046] According to the embodiments of the present invention, the rear floor structure 100, which is integrally cast, can effectively reduce its own weight, optimize its overall performance, reduce its production cost, and improve its production efficiency. By providing a first groove 3 with an opening facing downward on the longitudinal beams and / or transverse beams, the overall bending and torsional stiffness and structural strength of the rear floor structure 100 can be effectively improved, while reducing the casting difficulty and cost of the rear floor structure 100.

[0047] In one embodiment of the present invention, such as Figures 1 to 10 As shown, the crossbeam assembly 23 includes a front crossbeam 231 near the front side of the rear floor body 1, a rear crossbeam 232 near the rear side of the rear floor body 1, and at least one intermediate crossbeam 233. In the front-rear direction, the intermediate crossbeam 233 is located between the front crossbeam 231 and the rear crossbeam 232. The reinforcing ribs of the front crossbeam 231, the rear crossbeam 232, and the intermediate crossbeam 233 all extend in a zigzag pattern in the left-right direction. For example... Figure 2 As shown, in the left and right directions of the vehicle, the reinforcing ribs in the front crossbeam 231, the middle crossbeam 233 and the rear crossbeam 232 all extend in a zigzag pattern. This design not only strengthens the overall structural strength and rigidity of the crossbeam assembly 23, but also improves the overall energy absorption effect of the rear floor structure 100 and enhances the overall impact resistance of the rear floor structure 100.

[0048] In one specific embodiment of the present invention, such as Figures 1 to 10As shown, the left end of the middle crossbeam 233 has a first intersection point with the left longitudinal beam 21, the right end of the middle crossbeam 233 has a second intersection point with the right longitudinal beam 22, the left end of the rear crossbeam 232 has a third intersection point with the left longitudinal beam 21, and the right end of the rear crossbeam 232 has a fourth intersection point with the right longitudinal beam 22. The first and second intersection points have a subframe left front mounting seat 24 and a subframe right front mounting seat 25 integrally cast with the rear floor frame 2, respectively. The third and fourth intersection points have a subframe left rear mounting seat 26 and a subframe right rear mounting seat 27 integrally cast with the rear floor frame 2, respectively.

[0049] In this specific embodiment, by placing the subframe mounting seat at the intersection of the crossbeam and the longitudinal beam, the structural rigidity of the subframe mounting seat can be effectively improved, thereby making the connection between the subframe and the rear floor structure 100 more robust and reliable. At the same time, by integrally casting the subframe mounting seat and the rear floor frame 2, the rear floor frame 2 as a whole can share the force of the subframe mounting seat, thereby reducing the load on the subframe mounting seat and extending its service life.

[0050] In one specific embodiment of the present invention, such as Figures 1 to 10 As shown, the rear floor structure 100 also includes a left rear shock absorber mounting seat 28 and a right rear shock absorber mounting seat 29 integrally cast with the rear floor frame 2. The left rear shock absorber mounting seat 28 is located between the subframe left front mounting seat 24 and the subframe left rear mounting seat 26 on the left longitudinal beam 21, and the right rear shock absorber mounting seat 29 is located between the subframe right front mounting seat 25 and the subframe right rear mounting seat 27 on the right longitudinal beam 22.

[0051] In this specific embodiment, by integrally casting the rear shock absorber mounting base and the rear floor frame 2, the structural strength and rigidity of the rear shock absorber mounting base can be effectively improved, thereby significantly enhancing the connection strength between the rear shock absorber and the rear shock absorber mounting base, making connection failure less likely, and thus improving the overall vehicle performance.

[0052] In one specific embodiment of the present invention, such as Figures 1 to 10 As shown, the left front subframe mounting seat 24, the right front subframe mounting seat 25, the left rear subframe mounting seat 26, the right rear subframe mounting seat 27, the left rear shock absorber mounting seat 28, and the right rear shock absorber mounting seat 29 all have a second groove 4 with an upward opening, and the second groove 4 has radially distributed reinforcing ribs.

[0053] The existing one-piece cast rear floor structure's subframe and rear shock absorber mounting brackets are cantilever structures, with only the end connected to the rear floor structure bearing the load. As a result, after the vehicle has been in operation for a long time, the connection between the subframe and the rear shock absorber and the rear floor structure is prone to failure, which can lead to safety accidents.

[0054] In this embodiment, both the subframe mounting bracket and the rear shock absorber mounting bracket are provided with an upward-facing second groove 4. The second groove 4 allows for mounting to the subframe and rear shock absorber respectively, effectively improving the connection strength between the subframe and the subframe mounting bracket, as well as the connection strength between the rear shock absorber and the rear shock absorber mounting bracket; for example... Figure 9 and Figure 10 As shown, when the subframe and the rear shock absorber are installed on the subframe mounting base and the rear shock absorber mounting base respectively, the two side walls of the second groove 4 can be stressed in the left and right directions of the vehicle, so that the connection between the subframe and the rear shock absorber and their respective mounting bases is less likely to fail, effectively improving the safety performance of the whole vehicle.

[0055] In one embodiment of the present invention, such as Figures 1 to 10 As shown, the reinforcing bars of the left longitudinal beam 21 and the right longitudinal beam 22 both include a first reinforcing bar extending in a zigzag pattern along the front-back direction, a second reinforcing bar extending in a zigzag pattern along the front-back direction, and a third reinforcing bar extending in a straight line along the front-back direction. The first and second reinforcing bars have multiple reinforcing bar intersection points in the front-back direction, and the third reinforcing bar connects two adjacent reinforcing bar intersection points in sequence in the front-back direction.

[0056] In this embodiment, the first and second reinforcing ribs extending in a zigzag pattern along the front-rear direction of the vehicle, and the third reinforcing rib extending in a straight line along the front-rear direction of the vehicle, can effectively improve the structural strength and bending and torsional stiffness of the longitudinal beam, thereby effectively improving the overall structural performance of the rear floor structure 100.

[0057] In one embodiment of the present invention, such as Figures 1 to 10 As shown, the rear floor structure 100 also includes a left rear wheel cover 5 and a right rear wheel cover 6 integrally cast with the rear floor body 1. In this embodiment, by integrally casting the rear wheel covers with the rear floor body 1, the mechanical properties of the rear wheel covers can be effectively improved, thereby effectively improving the overall quality of the rear floor structure 100.

[0058] In one specific embodiment of the present invention, such as Figures 1 to 10 As shown, the left side of the left longitudinal beam 21 is a plane, and the lower end of the left rear wheel arch 5 is connected to the left side of the left longitudinal beam 21; the right side of the right longitudinal beam 22 is a plane, and the lower end of the right rear wheel arch 6 is connected to the right side of the right longitudinal beam 22. For example... Figure 7 As shown, the lower end of the left rear wheel cover 5 is integrated with the left side of the left longitudinal beam 21, and the lower end of the right rear wheel cover 6 is integrated with the right side of the right longitudinal beam 22. This design not only reduces the difficulty of integral casting and improves structural performance, but also reduces casting molds, lowers casting costs, and improves casting efficiency.

[0059] In one specific embodiment of the present invention, such as Figures 1 to 10 As shown, the angle between the left side of the left longitudinal beam 21 and the horizontal plane is 'a', and the angle between the right side of the right longitudinal beam 22 and the horizontal plane is 'b', satisfying the conditions: 85°≤a<90°, 85°≤b<90°. This design can effectively reduce the difficulty of demolding and improve product quality.

[0060] In one specific embodiment of the present invention, such as Figures 1 to 10 As shown, the left rear wheel arch 5 has multiple first inner reinforcing ribs 51 extending vertically on its right-facing side, with the lower ends of the first inner reinforcing ribs 51 extending to the rear floor body 1; the right rear wheel arch 6 has multiple second inner reinforcing ribs extending vertically on its left-facing side, with the lower ends of the second inner reinforcing ribs extending to the rear floor body 1. In this specific embodiment, the first inner reinforcing ribs 51 and the second inner reinforcing ribs can effectively improve the structural strength and mechanical properties of the rear wheel arch.

[0061] In one specific embodiment of the present invention, such as Figures 1 to 10 As shown, the rear floor structure 100 is made of aluminum alloy. Aluminum alloy is lightweight and has high structural strength. Using aluminum alloy to manufacture the rear floor structure 100 can effectively reduce the weight of the rear floor structure 100 and improve the structural strength and rigidity of the rear floor structure 100.

[0062] The present invention also provides a casting mold for the rear floor structure 100 of the above embodiments;

[0063] According to an embodiment of the present invention, a casting mold includes a movable mold and a fixed mold. The movable mold is movably disposed at the upper end of the fixed mold, and a casting space of a rear floor structure 100 is formed between the movable mold and the fixed mold.

[0064] Compared with existing molds for integral casting of rear floor structures, since the longitudinal beams of the rear floor structure 100 in the above embodiment are not designed with "C"-shaped grooves, there is no need to design additional core-pulling slider molds on both sides of the longitudinal beams. Thus, manufacturing the rear floor structure 100 in the above embodiment does not require four sets of molds: core-pulling slider mold, moving mold, and fixed mold. Only two sets of molds, the moving mold and the fixed mold, are needed, which effectively reduces casting difficulty and casting cost and improves casting efficiency.

[0065] The other configurations and operations of the rear floor structure 100 and the casting mold according to embodiments of the present invention are known to those skilled in the art and will not be described in detail here.

[0066] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0067] Although embodiments of the invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A rear floor structure, characterized in that, include: The rear floor body and rear floor frame are integrally cast. The rear floor frame includes a left longitudinal beam, a right longitudinal beam, and a beam group. The beam group includes at least two beams connected between the left and right longitudinal beams. The beam group includes a front beam near the front of the rear floor body, a rear beam near the rear of the rear floor body, and at least one intermediate beam. In the front-rear direction, the intermediate beam is located between the front and rear beams. The left longitudinal beam, the right longitudinal beam, and the beam group all have a first groove with an opening facing downwards. Multiple reinforcing ribs are provided in the first groove. The left end of the middle crossbeam has a first intersection point with the left longitudinal beam, the right end of the middle crossbeam has a second intersection point with the right longitudinal beam, the left end of the rear crossbeam has a third intersection point with the left longitudinal beam, and the right end of the rear crossbeam has a fourth intersection point with the right longitudinal beam. The first and second intersection points respectively have a subframe left front mounting seat and a subframe right front mounting seat integrally cast with the rear floor frame. The third and fourth intersection points respectively have a subframe left rear mounting seat and a subframe right rear mounting seat integrally cast with the rear floor frame. The subframe front left mounting seat, subframe front right mounting seat, subframe rear left mounting seat, and subframe rear right mounting seat are disposed in the first groove, and their peripheral walls are connected to the reinforcing rib and one of the left longitudinal beam or the right longitudinal beam.

2. The rear floor structure according to claim 1, characterized in that, The reinforcing ribs of the front crossbeam, the rear crossbeam, and the middle crossbeam all extend in a zigzag pattern along the left and right directions.

3. The rear floor structure according to claim 2, characterized in that, The rear floor structure also includes a left rear shock absorber mounting base and a right rear shock absorber mounting base integrally cast with the rear floor frame. The left rear shock absorber mounting base is located between the subframe left front mounting base and the subframe left rear mounting base on the left longitudinal beam, and the right rear shock absorber mounting base is located between the subframe right front mounting base and the subframe right rear mounting base on the right longitudinal beam.

4. The rear floor structure according to claim 3, characterized in that, The subframe left front mounting seat, the subframe right front mounting seat, the subframe left rear mounting seat, the subframe right rear mounting seat, the left rear shock absorber mounting seat, and the right rear shock absorber mounting seat all have a second groove with an upward opening, and the second groove has radially distributed reinforcing ribs.

5. The rear floor structure according to claim 1, characterized in that, The reinforcing ribs of the left longitudinal beam and the right longitudinal beam each include a first reinforcing rib extending in a zigzag pattern along the front-back direction, a second reinforcing rib extending in a zigzag pattern along the front-back direction, and a third reinforcing rib extending in a straight line along the front-back direction. The first and second reinforcing ribs have multiple reinforcing rib intersection points in the front-back direction, and the third reinforcing rib connects two adjacent reinforcing rib intersection points in the front-back direction.

6. The rear floor structure according to claim 1, characterized in that, The rear floor structure also includes a left rear wheel cover and a right rear wheel cover integrally cast with the rear floor body.

7. The rear floor structure according to claim 6, characterized in that, The left side of the left longitudinal beam is a plane, and the lower end of the left rear wheel arch is connected to the left side of the left longitudinal beam. The right side of the right longitudinal beam is a plane, and the lower end of the right rear wheel arch is connected to the right side of the right longitudinal beam.

8. The rear floor structure according to claim 7, characterized in that, The angle between the left side of the left longitudinal beam and the horizontal plane is 'a', and the angle between the right side of the right longitudinal beam and the horizontal plane is 'b', satisfying: 85°≤a<90°, 85°≤b<90°.

9. The rear floor structure according to claim 6, characterized in that, The left rear wheel arch has a plurality of first inner reinforcing ribs extending in the vertical direction on the right side, and the lower end of the first inner reinforcing ribs extends to the rear floor body. The right rear wheel arch has multiple second inner reinforcing ribs extending vertically on its left-facing side, with the lower ends of the second inner reinforcing ribs extending to the rear floor body.

10. The rear floor structure according to any one of claims 1-9, characterized in that, The rear floor structure is made of aluminum alloy.

11. A casting mold for the rear floor structure according to any one of claims 1-10, characterized in that, include: A moving mold and a fixed mold are provided, wherein the moving mold is movably disposed at the upper end of the fixed mold, and the casting space of the rear floor structure is formed between the moving mold and the fixed mold.

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