Integrated rear floor and vehicle

Abstract

The invention provides an integrated rear floor and a vehicle. The integrated rear floor comprises a rear floor body; a rear cross member; the rear extension beam is connected with at least one of the rear plate body and the rear cross beam, at least part of the rear extension beam extends in the length direction of the rear floor, the rear extension beam comprises two side connecting plates and a bottom connecting plate, and at least one machining groove is formed in at least one of the two oppositely-arranged side connecting plates; wherein an angle is formed between the inner surface of the side, facing the mounting space, of the side connecting plate provided with the machining grooves and the outer surface of the side, away from the mounting space, of the side connecting plate, the machining grooves are formed in the outer surface, the plane where the groove bottoms of the machining grooves are located is parallel to the inner surface, and a die drawing platform is arranged in at least one machining groove; at least part of the draft platform extends in the circumferential direction of the connecting hole, and an angle is formed between the draft platform and the inner surface. According to the scheme, the problems that in the prior art, the machining efficiency of the connecting wall of the integrated rear floor and the rear longitudinal beam is low, and the quality is poor are solved.

Description

Technical Field

[0001] This invention relates to the field of vehicle component manufacturing technology, and more specifically, to an integrated rear floor and vehicle. Background Technology

[0002] When assembling an integrated floor, the entire rear longitudinal beam is typically not integrated. Instead, a portion of the rear longitudinal beam is made into a separate structure and bolted to the integrated floor to improve maintenance efficiency. Because the casting requires a draft angle, the two sides of the connecting wall are not parallel. To ensure reliable bolt tightening, the bolt head contact surface on one side needs to be machined to ensure both sides are perpendicular to the bolt hole axis. However, this connecting wall is a thin-walled structure with insufficient rigidity, making it prone to deformation and chatter during machining, resulting in low processing efficiency and difficulty in guaranteeing quality.

[0003] There is currently no effective solution to the aforementioned technical problems. Summary of the Invention

[0004] The main objective of this invention is to provide an integrated rear floor and vehicle to solve the problems of low processing efficiency and poor quality of the connecting wall between the integrated rear floor and the rear longitudinal beam in the prior art.

[0005] To achieve the above objectives, according to one aspect of the present invention, an integrated rear floor is provided, comprising: a rear panel; a rear crossbeam connected to the rear panel; and a rear extension beam connected to at least one of the rear panel and the rear crossbeam, wherein at least a portion of the rear extension beam extends along the length direction of the rear floor, the rear extension beam comprising two side connecting plates and a bottom connecting plate, the two sides of the bottom connecting plate being connected to one of the side connecting plates respectively to form an installation space, the two side connecting plates being disposed opposite to each other along the width direction of the rear floor, the side connecting plates having a plurality of connecting holes, at least one of the two oppositely disposed side connecting plates having at least one machining groove, a portion of the connecting holes being formed at the bottom of the machining groove; wherein, the inner surface of the side connecting plate with the machining groove facing the installation space is angled to the outer surface of the side facing away from the installation space, the machining groove is formed on the outer surface, the plane of the bottom of the machining groove is parallel to the inner surface, at least one machining groove having a draft platform, at least a portion of the draft platform extending circumferentially along the connecting holes, the draft platform being angled to the inner surface.

[0006] Furthermore, the rear plate is integrally cast with the rear crossbeam and the rear extension beam.

[0007] Furthermore, the distance between the inner and outer surfaces is set to gradually increase from top to bottom along the height direction of the rear floor, and the distance between the draft platform and the plane containing the bottom of the machining groove is set to gradually increase from top to bottom along the height direction of the rear floor.

[0008] Furthermore, the distance between the inner and outer surfaces is D, and the distance between the draft platform and the plane containing the bottom of the machined groove is H, where 0.8D≤H≤0.82D.

[0009] Furthermore, along the height direction of the rear floor, a first machining groove is formed at the end of the side connecting plate with the machining groove away from the bottom connecting plate, and a second machining groove is formed at the end of the side connecting plate with the machining groove near the bottom connecting plate. The first machining groove and the second machining groove are spaced apart along the height direction of the rear floor. A drafting platform is provided in the second machining groove, and the drafting platform is connected to the groove wall of the second machining groove.

[0010] Furthermore, there is an angle α between the inner surface and the outer surface, wherein 5.8°≤α≤6.2°, and / or, there is an angle β between the inner surface and the vertical plane perpendicular to the horizontal plane, and an angle γ between the outer surface and the vertical plane perpendicular to the horizontal plane, wherein 2.8°≤β≤3.2° and 2.8°≤γ≤3.2°.

[0011] Furthermore, there is an angle δ between the draft platform and the plane containing the bottom of the second machining groove, where 3.8°≤δ≤4.2°.

[0012] Furthermore, the draft angle of the plane where the draft platform is located is 0.8°~1.2°, and the draft angle of the outer surface is 2.8°~3.2°.

[0013] Furthermore, the two side connecting plates located on both sides of the same installation space have parallel side surfaces, while the other side connecting plate has an inner surface and an outer surface on its two sides respectively.

[0014] Furthermore, the geometric center line of the connecting hole located in the second machining groove is perpendicular to the inner surface in the axial direction.

[0015] According to another aspect of the present invention, a vehicle is provided having an integrated rear floor, wherein the integrated rear floor is the aforementioned integrated rear floor.

[0016] Applying the technical solution of this invention, the integrated rear floor is connected to the rear longitudinal beam of the vehicle frame via a rear extension beam. The rear extension beam includes two side connecting plates and a bottom connecting plate. The two side connecting plates and the bottom connecting plate enclose an installation space, allowing the rear longitudinal beam to extend into this space. The connection between the rear longitudinal beam and the rear extension beam is achieved through connecting holes on the side and bottom connecting plates. To ensure a stable connection between the rear extension beam and the rear longitudinal beam, the thicker side connecting plate is machined to have the plane containing the connecting holes machined parallel to the connecting surface of the rear longitudinal beam. This ensures that the connector can tightly connect the side connecting plate and the rear longitudinal beam through the connecting holes. Furthermore, a draft platform is provided within the machining groove. This draft platform extends circumferentially along the connecting holes and is positioned at a distance from them to allow for installation space for the connector. This allows the draft platform to minimize the machining allowance of the side connecting plates without affecting the connection strength between the rear longitudinal beam and the rear extension beam, thereby reducing the cutting depth and optimizing machining performance. Attached Figure Description

[0017] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:

[0018] Figure 1 A structural schematic diagram of an embodiment of the integrated rear floor according to the present invention is shown;

[0019] Figure 2 It shows Figure 1 Enlarged diagram of point A in the middle.

[0020] The above figures include the following reference numerals:

[0021] 10. Rear panel;

[0022] 20. Rear crossbeam;

[0023] 30. Rear extension beam; 300. Installation space; 31. Side connecting plate; 310. Connecting hole; 311. Inner surface; 312. Outer surface; 32. Bottom connecting plate; 33. Machining groove; 330. Draft platform; 331. First machining groove; 332. Second machining groove. Detailed Implementation

[0024] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0025] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0026] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such terms can be used interchangeably where appropriate so that the embodiments of this application described herein can be implemented, for example, in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover a non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0027] Exemplary embodiments according to this application will now be described in more detail with reference to the accompanying drawings. However, these exemplary embodiments may be implemented in many different forms and should not be construed as being limited to the embodiments set forth herein. It should be understood that these embodiments are provided so that the disclosure of this application is thorough and complete, and that the concept of these exemplary embodiments is fully conveyed to those skilled in the art. In the drawings, for clarity, the thickness of layers and regions may be exaggerated, and the same reference numerals are used to denote the same devices, and therefore their description will be omitted.

[0028] Combination Figures 1 to 2 As shown, according to a specific embodiment of this application, an integrated rear floor is provided.

[0029] Specifically, such as Figure 1 , Figure 2As shown, the integrated rear floor includes a rear panel 10, a rear crossbeam 20, and a rear extension beam 30. The rear crossbeam 20 is connected to the rear panel 10; the rear extension beam 30 is connected to at least one of the rear panel 10 and the rear crossbeam 20. At least a portion of the rear extension beam 30 extends along the length of the rear floor. The rear extension beam 30 includes two side connecting plates 31 and a bottom connecting plate 32. Each side of the bottom connecting plate 32 is connected to one of the side connecting plates 31 to form an installation space 300. The two side connecting plates 31 are arranged opposite each other along the width of the rear floor. The side connecting plates 31 have multiple connecting holes 310. At least one of the two oppositely arranged side connecting plates 31... At least one machining groove 33 is provided on the side connecting plate 31 with the machining groove 33. Part of the connecting hole 310 is provided at the bottom of the machining groove 33. The inner surface 311 of the side connecting plate 31 with the machining groove 33 facing the installation space 300 is set at an angle to the outer surface 312 away from the installation space 300. The machining groove 33 is provided on the outer surface 312. The plane where the bottom of the machining groove 33 is located is parallel to the inner surface 311. At least one machining groove 33 is provided with a draft platform 330. At least part of the draft platform 330 extends circumferentially along the connecting hole 310. The draft platform 330 is set at an angle to the inner surface 311.

[0030] Applying the technical solution of this embodiment, the integrated rear floor is connected to the rear longitudinal beam of the frame by setting a rear extension beam 30. The rear extension beam 30 includes two side connecting plates 31 and a bottom connecting plate 32. The two side connecting plates 31 and the bottom connecting plate 32 enclose an installation space 300, which allows the rear longitudinal beam to extend into the installation space 300. The connection between the rear longitudinal beam and the rear extension beam 30 is achieved through the connection holes 310 on the side connecting plates 31 and the bottom connecting plate 32. In order to ensure a stable connection between the rear extension beam 30 and the rear longitudinal beam, the thicker side connecting plate 31 needs to be machined to make the plane where the connection hole 310 is located parallel to the connection surface of the rear longitudinal beam, so as to ensure that the connector can tightly connect the side connecting plate 31 and the rear longitudinal beam through the connection hole 310. Furthermore, by providing a draft platform 330 within the machining slot 33, extending circumferentially along the connecting hole 310 and spaced apart from it to allow for the installation of the connector, the draft platform 330 minimizes the machining allowance of the side connecting plate 31 without affecting the connection strength between the rear longitudinal beam and the rear extension beam 30, thereby reducing the cutting depth and optimizing machining performance.

[0031] It should be noted that the connector connects the rear extension beam 30 to the rear longitudinal beam through the connecting hole 310. The connector can be a screw, a pin, or a rivet. The bottom of the machined groove 33 is machined to be parallel to the surface of the rear longitudinal beam, so that the head of the screw, the pin, or the rivet can fit tightly against the outer surface 312 of the side connecting plate 31.

[0032] Those skilled in the art should understand that draft angle and demolding angle are parameters in the casting process used to ensure that the casting is smoothly removed from the mold without sticking or damaging the surface of the casting. By designing them to have a certain angle, it can be ensured that when the floor is cast as a whole, the casting can be smoothly demolded while maintaining the required non-parallel relationship between the two sides of the side connecting plate 31 to meet the requirements of subsequent machining and assembly.

[0033] Specifically, the rear plate 10 is integrally cast with the rear crossbeam 20 and the rear extension beam 30. Integrating the rear plate 10, rear crossbeam 20, and rear extension beam 30 into a single unit improves assembly efficiency and connection strength, reduces the number of subsequent assembly steps and time, and thus lowers manufacturing costs.

[0034] Optionally, the rear panel 10, rear crossbeam 20, and rear extension beam 30 are all integrally cast from aluminum alloy. The aluminum alloy material can reduce the overall weight of the rear floor to meet the standard requirements for lightweighting, thereby reducing fuel consumption, improving fuel economy, and also reducing the material cost of the rear floor.

[0035] Furthermore, such as Figure 2 As shown, the distance between the inner surface 311 and the outer surface 312 gradually increases from top to bottom along the height direction of the rear floor, and the distance between the draft platform 330 and the plane containing the bottom of the machining groove 33 also gradually increases from top to bottom along the height direction of the rear floor. The gradual increase in the distance between the inner surface 311 and the outer surface 312 along the height direction of the rear floor, through the design of the draft angle to decrease from top to bottom, ensures that sufficient molten metal material is retained where it is most needed (e.g., the bottom of the side connecting plate 31 where the wall thickness is greater), thereby improving the rigidity of the part and reducing deformation during machining. Meanwhile, the distance between the draft platform 330 and the bottom plane of the machining groove 33 is gradually increased from top to bottom along the height direction of the rear floor. This allows the draft platform 330 to maintain its own draft angle in the height direction of the rear floor. Even when the casting wall thickness is large, it can ensure that the structure around the connecting hole 310 has better machinability, thereby avoiding chatter and deformation during processing and improving processing efficiency and part quality.

[0036] It should be noted that the outer surface 312 of the side connecting plate 31 has its own draft angle, and the draft platform 330 can also have its own draft angle. Setting the draft platform 330 to have its own draft angle and reducing the draft angle of the draft platform 330 can reduce the cutting depth, thereby optimizing the machining performance.

[0037] Specifically, the distance between the inner surface 311 and the outer surface 312 is D, and the distance between the draft platform 330 and the plane containing the bottom of the machining groove 33 is H, where 0.8D ≤ H ≤ 0.82D. By optimizing the structure of the draft platform 330 around the connecting hole 310 and adjusting the draft angle to a lower angle, the originally required machining allowance is significantly reduced, especially near the thicker lower connecting hole 310. This reduces material waste and processing costs, and also effectively improves the stability of the thin-walled structure during processing, avoiding processing deformation and chatter.

[0038] In one exemplary embodiment of this application, by controlling the machining depth of the draft platform 330, the machining allowance can be minimized while ensuring the stability of the original connection structure, reducing material waste and machining time. The maximum cutting depth can be reduced by approximately 19%, thereby improving machining efficiency and ensuring machining accuracy. For the connection between the integrated rear floor and the rear longitudinal beam, the manufacturing process and product quality can be significantly optimized while maintaining its maintenance economy, and production costs can also be reduced.

[0039] Furthermore, such as Figure 2 As shown, along the height direction of the rear floor, a first machining groove 331 is formed at the end of the side connecting plate 31 with machining groove 33 away from the bottom connecting plate 32, and a second machining groove 332 is formed at the end of the side connecting plate 31 with machining groove 33 near the bottom connecting plate 32. The first machining groove 331 and the second machining groove 332 are spaced apart along the height direction of the rear floor. A draft platform 330 is provided inside the second machining groove 332, and the draft platform 330 is connected to the groove wall of the second machining groove 332. The draft platform 330, located near the bottom connecting plate 32, provides a stable support surface during the casting process, helping the casting to be easily demolded from the mold. Since the second machining groove 332 is located below the floor, the wall thickness is greater here, and the challenges of deformation and chatter during machining are more severe. Therefore, setting a draft platform inside the groove not only ensures the smoothness of the casting process but also provides additional structural stability and support before machining, reducing the difficulties of subsequent processing. The first machining groove 331 is located at the end of the side connecting plate 31 away from the bottom connecting plate 32. Since the first machining groove 331 is not in the position closest to the bottom connecting plate 32, the wall thickness here may be less than that at the bottom. Therefore, the design of the first machining groove 331 does not need to consider the material rigidity issue too much.

[0040] Specifically, there is an angle α between the inner surface 311 and the outer surface 312, where 5.8° ≤ α ≤ 6.2°, and / or, there is an angle β between the inner surface 311 and a vertical surface perpendicular to the horizontal plane, and an angle γ between the outer surface 312 and a vertical surface perpendicular to the horizontal plane, where 2.8° ≤ β ≤ 3.2° and 2.8° ≤ γ ≤ 3.2°. Angles α, β, and γ can be used to represent the draft angles of the side connecting plate 31, the inner surface 311, and the outer surface 312. By setting specific angles for α, β, and γ, it can be ensured that the casting can be easily demolded after the integrated floor is cast, while maintaining the required non-parallel relationship between the two sides of the connecting wall. The setting of angles β and γ also gives the side connecting plate 31 a certain draft angle in the vertical direction, enhancing the demolding performance of the casting. Simultaneously, during machining, since angles β and γ are small, the machining amount caused by the casting draft angle can be reduced, thereby reducing material waste and improving machining efficiency.

[0041] Preferably, the angle α between the inner surface 311 and the outer surface 312 is 6°, the angle β between the inner surface 311 and the vertical plane perpendicular to the horizontal plane is 3°, and the angle γ between the outer surface 312 and the vertical plane perpendicular to the horizontal plane is 3°.

[0042] Furthermore, there is an angle δ between the plane containing the draft platform 330 and the bottom of the second machining groove 332, where 3.8°≤δ≤4.2°. The plane containing the draft platform 330 has its own tilt angle δ. The existence of angle δ ensures that the draft platform 330 has an appropriate tilt during the casting process, which helps the casting to be smoothly removed from the mold. Since the second machining groove 332 is located on the thicker part of the side connecting plate 31, deformation and chatter problems are prone to occur during machining, especially when the machining tool is close to the bottom of the groove. By setting angle δ, it is possible to ensure that a reasonable contact angle is maintained between the tool and the workpiece during machining, which helps to improve the stability and accuracy of machining and reduce adverse effects during machining.

[0043] In one embodiment of this application, the draft angle of the plane containing the draft platform 330 is 0.8°~1.2°, and the draft angle of the outer surface 312 is 2.8°~3.2°. The angle difference between δ and γ is approximately 2°, which means that the draft angle of the draft platform 330 is reduced from 3° to approximately 1° compared to the draft angle of the outer surface 312. When the 1° draft angle occupies only a small area, it has almost no impact on casting performance, and the maximum cutting depth can be reduced by approximately 19%, maximizing the optimization of machining performance.

[0044] Furthermore, the geometric center line of the connecting hole 310 located in the second machining groove 332 is perpendicular to the inner surface 311 in the axial direction. In this embodiment, the connector is a bolt, and the connecting hole 310 is a threaded hole. The center line of the threaded hole is perpendicular to the inner surface 311, which ensures that the bolt is perpendicular to the inner surface of the side connecting plate 31 when tightened, thereby forming the maximum contact area between the bolt and the side connecting plate 31, enhancing the fastening effect of the connector, and improving the structural strength and stability of the connection. At the same time, the vertically aligned center line of the connecting hole means that during machining, the tool can machine along a preset vertical path, simplifying the machining process and improving machining efficiency.

[0045] According to another specific embodiment of this application, a vehicle is also provided, which has an integrated rear floor, the integrated rear floor being the same as the one described in the above embodiment. The integrated rear floor described in the above embodiment is applied to a commercial vehicle, and the integrated rear floor is connected to the rear crossbeam of the vehicle frame via a rear extension beam 30. The rear extension beam 30 includes two side connecting plates 31 and a bottom connecting plate 32, which together form an installation space 300. The side connecting plates 31 have multiple connecting holes 310, and at least one side connecting plate 31 has a machining groove 33 on its outer surface 312, with some connecting holes 310 located at the bottom of the machining groove 33. A draft platform 330 is disposed within the machining groove 33, extending circumferentially along the connecting holes 310. The angle formed between the draft platform 330 and the inner surface 311 optimizes the demolding performance of the casting, while significantly reducing the machining allowance around the bolt holes. By adjusting the draft angle of the draft platform 330 from 3° to 1°, the maximum cutting depth is reduced by 19%. This improvement effectively reduces deformation and chatter during processing, improving processing efficiency and quality.

[0046] The casting process of the integrated rear floor in the above embodiments is as follows:

[0047] When machining the integrated floor, the casting is first formed in a mold, and then the extension beam 30, including two side connecting plates 31 and a bottom connecting plate 32, together constitutes the installation space 300. During the casting process, the side connecting plates 31 of the casting are designed with a certain draft angle, that is, there is an angle α between the inner surface 311 and the outer surface 312, to ensure that the casting can be smoothly removed from the mold. After the casting is formed, the outer surface 312 around the bolt holes needs to be machined to ensure that the axial center line of the connecting hole 310 is perpendicular to the inner surface 311, meeting the requirements for reliable bolt fastening. In order to reduce the machining allowance, around some bolt holes, that is, in the lower area where the wall thickness of the side connecting plate 31 is relatively thick, the draft angle is reduced from 3° to 1°, and a machining groove 33 is provided on the outer surface 312 of the side connecting plate 31, with some connecting holes 310 located at the bottom of the machining groove 33. During machining, the circumferential extension design of the draft platform 330 and the connecting hole 310 in the machining groove 33 can effectively control the cutting depth, reduce the maximum cutting depth by up to 19%, and optimize machining efficiency and quality.

[0048] When the casting is placed on the machining equipment, the side connecting plate 31 is first positioned to ensure the accurate placement of the machining groove 33 on the outer surface 312. Subsequently, the machining tool performs precision machining along the bottom of the groove to form bolt holes. Simultaneously, by controlling the tool path, the depth of cut is reduced, minimizing material removal. During this machining process, the contact surface between the tool and the casting is confined within the machining groove 33, effectively preventing deformation and chatter of the thin-walled structure during machining and ensuring the machining accuracy of the bolt holes. Finally, after machining, the integrated floor maintains perpendicularity between the two sides of the side connecting plate 31 and the bolt hole axis, meeting the requirements for connection strength and reliability. This significantly reduces material consumption and machining time, achieving efficient and high-quality machining results.

[0049] As can be seen from the above description, the integrated floor in the above embodiments has the following beneficial effects:

[0050] By optimizing the draft angle of the draft platform 330 during the casting stage, the machining efficiency and quality of the castings were significantly improved. By locally adjusting the draft angle to 1°, the maximum depth of cut was reduced by approximately 19% without affecting demolding performance. This effectively avoided deformation and chatter issues in thin-walled structures during machining, ensuring precise machining of bolt holes and improving the reliability of connections. Furthermore, the one-piece casting design not only simplifies the manufacturing process but also enhances the stability and durability of the overall structure, reduces production costs, and improves the overall performance and maintenance economy of the vehicle.

[0051] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0052] In addition to the above, it should be noted that the terms "one embodiment," "another embodiment," and "embodiment" used in this specification refer to specific features, structures, or characteristics described in connection with that embodiment, which are included in at least one embodiment described in the general description of this application. The appearance of the same expression in multiple places in the specification does not necessarily refer to the same embodiment. Furthermore, when a specific feature, structure, or characteristic is described in connection with any embodiment, the intention is to suggest that implementing such a feature, structure, or characteristic in conjunction with other embodiments also falls within the scope of this invention.

[0053] In the above embodiments, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0054] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. An integrated flooring, characterized in that, include: Rear plate (10); Rear crossbeam (20), the rear crossbeam (20) is connected to the rear plate (10); A rear extension beam (30) is connected to at least one of the rear plate (10) and the rear crossbeam (20). At least a portion of the rear extension beam (30) extends along the length direction of the rear floor. The rear extension beam (30) includes two side connecting plates (31) and a bottom connecting plate (32). The two sides of the bottom connecting plate (32) are respectively connected to one of the side connecting plates (31) to form an installation space (300). The two side connecting plates (31) are arranged opposite to each other along the width direction of the rear floor. A plurality of connecting holes (310) are provided on the side connecting plates (31). At least one of the two oppositely arranged side connecting plates (31) is provided with at least one machined groove (33). A portion of the connecting holes (310) are provided at the bottom of the machined groove (33). The side connecting plate (31) with the machining groove (33) is angled between its inner surface (311) facing the mounting space (300) and its outer surface (312) away from the mounting space (300). The machining groove (33) is opened on the outer surface (312). The plane where the bottom of the machining groove (33) is located is parallel to the inner surface (311). At least one of the machining grooves (33) is provided with a draft platform (330). At least a portion of the draft platform (330) extends circumferentially along the connecting hole (310). The draft platform (330) is angled with the inner surface (311).

2. The integrated flooring according to claim 1, characterized in that, The rear plate (10) is integrally cast with the rear crossbeam (20) and the rear extension beam (30).

3. The integrated flooring according to claim 1 or 2, characterized in that, The distance between the inner surface (311) and the outer surface (312) is gradually increased from top to bottom along the height direction of the rear floor, and the distance between the draft platform (330) and the plane where the bottom of the machining groove (33) is located is gradually increased from top to bottom along the height direction of the rear floor.

4. The integrated flooring according to claim 3, characterized in that, The distance between the inner surface (311) and the outer surface (312) is D, and the distance between the draft platform (330) and the plane where the bottom of the machined groove (33) is located is H, wherein 0.8D≤H≤0.82D.

5. The integrated flooring according to claim 4, characterized in that, Along the height direction of the rear floor, the side connecting plate (31) with the machining groove (33) has a first machining groove (331) at the end away from the bottom connecting plate (32), and the side connecting plate (31) with the machining groove (33) has a second machining groove (332) at the end near the bottom connecting plate (32). The first machining groove (331) and the second machining groove (332) are spaced apart along the height direction of the rear floor. The second machining groove (332) is provided with a draft platform (330), and the draft platform (330) is connected to the groove wall of the second machining groove (332).

6. The integrated flooring according to claim 5, characterized in that, There is an angle α between the inner surface (311) and the outer surface (312), wherein 5.8°≤α≤6.2°, and / or, there is an angle β between the inner surface (311) and the vertical surface perpendicular to the horizontal plane, and an angle γ between the outer surface (312) and the vertical surface perpendicular to the horizontal plane, wherein 2.8°≤β≤3.2°, 2.8°≤γ≤3.2°.

7. The integrated flooring according to claim 6, characterized in that, The plane between the draft platform (330) and the bottom of the second machining groove (332) has an angle δ, where 3.8°≤δ≤4.2°.

8. The integrated flooring according to claim 7, characterized in that, The draft angle of the plane where the draft platform (330) is located is 0.8°~1.2°, and the draft angle of the outer surface (312) is 2.8°~3.2°.

9. The integrated flooring according to any one of claims 1, 2, 4-8, characterized in that, The two side connecting plates (31) located on both sides of the same installation space (300) have parallel side surfaces, and the other side connecting plate (31) has an inner surface (311) and an outer surface (312) formed on both sides respectively.

10. The integrated flooring according to any one of claims 5-7, characterized in that, The geometric center line of the connecting hole (310) located in the second machining groove (332) in the axial direction is perpendicular to the inner surface (311).

11. A vehicle, characterized in that, The vehicle has an integrated rear floor, which is the integrated rear floor as described in any one of claims 1-10.

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