Auxiliary frame assembly and vehicle

Abstract

The utility model discloses an auxiliary frame assembly and a vehicle, the auxiliary frame assembly comprises a first cross beam, a second cross beam and a bottom guard plate, the first cross beam and the second cross beam are respectively provided with a connecting surface, and the connecting surfaces are planes; the bottom protection plate is arranged between the first cross beam and the second cross beam, and the two ends of the bottom protection plate are connected with the connecting faces of the corresponding ends respectively. Therefore, the bottom guard plate of the auxiliary frame assembly is connected with the connecting face of the first cross beam and the connecting face of the second cross beam in a welded mode, the connecting face is a plane, the welding difficulty between the bottom guard plate and the first cross beam and the welding difficulty between the bottom guard plate and the second cross beam are lowered, the welding quality of the tail ends of welding seams is guaranteed, and the contact area between the bottom guard plate and the first cross beam and the contact area between the bottom guard plate and the second cross beam are increased. Meanwhile, the welding seam can avoid the fillet positions of the first cross beam and the second cross beam, stress concentration of the tail end of the welding seam when the tail end is loaded is effectively reduced, durability of the welding seam is improved, and the product quality of the auxiliary frame assembly is guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of vehicles, in particular to a subframe assembly and a vehicle. Background Art

[0002] In the prior art, the fillet welding between the vehicle upper bottom plate and the upper cross beam of the subframe assembly is prone to cracking and failure at the welding joint, and the flange width on the bottom guard plate is small, resulting in poor structural strength of the bottom guard plate. Utility Model Content

[0003] The utility model aims to solve at least one of the technical problems existing in the prior art. To this end, the first purpose of the utility model is to provide a subframe assembly that can improve the connection strength between the bottom guard plate and the first crossbeam and the second crossbeam, thereby enhancing the structural strength of the subframe assembly.

[0004] The second objective of the present utility model is to provide a vehicle, comprising the subframe assembly described in the above embodiment.

[0005] According to a first aspect of the utility model, a subframe assembly includes: a first crossbeam, a second crossbeam and a bottom guard plate, wherein the first crossbeam and the second crossbeam both have a connecting surface, and the connecting surface is a plane; the bottom guard plate is arranged between the first crossbeam and the second crossbeam, and the two ends of the bottom guard plate are respectively connected to the connecting surfaces at the corresponding ends.

[0006] According to the sub-frame assembly of the embodiment of the utility model, the bottom guard plate of the sub-frame assembly is respectively welded to the connection surface of the first cross beam and the second cross beam, and the connection surface is a plane, so as to reduce the welding difficulty between the bottom guard plate and the first cross beam and the second cross beam, ensure the welding quality of the end of the weld, and increase the contact area between the bottom guard plate and the first cross beam and the second cross beam. At the same time, the weld can avoid the fillet position of the first cross beam and the second cross beam, effectively reduce the stress concentration at the end of the weld when subjected to load, improve the durability of the weld, and ensure the product quality of the sub-frame assembly.

[0007] In some embodiments, the connecting surface includes: a first connecting surface and a second connecting surface, the first connecting surface is located on a side of the first beam adjacent to the second beam; the second connecting surface is located on a side of the second beam adjacent to the first beam, the first connecting surface is opposite to the second connecting surface, one end of the bottom guard plate is connected to the first connecting surface, and the other end of the bottom guard plate is connected to the second connecting surface.

[0008] In some embodiments, the bottom guard plate includes: a guard plate body, a first flange and a second flange, the first flange being arranged at one end of the guard plate body adjacent to the first cross beam, the first flange being arranged at both sides of the guard plate body along the width direction of the guard plate body and being bent respectively toward and away from the center of the guard plate body, and the first flange being connected to the first connecting surface; the second flange being arranged at one end of the guard plate body adjacent to the second cross beam, the second flange being arranged at both sides of the guard plate body along the width direction of the guard plate body and being bent respectively toward and away from the center of the guard plate body, and the second flange being connected to the second connecting surface.

[0009] In some embodiments, the width of the first flange is L1, and L1 satisfies: 15mm≤L1≤20mm; and / or the width of the second flange is L2, and L2 satisfies: 15mm≤L2≤20mm.

[0010] In some embodiments, the bottom guard plate also includes: a third flange, the third flange is arranged on both sides of the guard plate body along the width direction of the guard plate body, one end of the third flange is connected to the guard plate body, and the other end of the third flange extends along the thickness direction of the guard plate body and bends toward the center of the guard plate body.

[0011] In some embodiments, the width of the third flange is L3, and L3 satisfies: 10mm≤L3≤15mm.

[0012] In some embodiments, the first flange, the second flange and the third flange transition with the guard plate body in a circular arc.

[0013] In some embodiments, it also includes: a fourth flange, which is arranged at both ends of the guard plate body along the length direction of the guard plate body, and the fourth flange is respectively connected to the first flange and the second flange at the corresponding end.

[0014] In some embodiments, the bottom guard plate is an integrally formed piece.

[0015] A vehicle according to an embodiment of the second aspect of the utility model comprises a subframe assembly according to an embodiment of the first aspect of the utility model.

[0016] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0018] Figure 1 It is a schematic diagram of a subframe assembly according to an embodiment of the utility model.

[0019] Figure 2 yes Figure 1 Schematic diagram of the enlarged P region.

[0020] Figure 3 It is a schematic diagram of a subframe assembly according to another perspective of an embodiment of the utility model.

[0021] Figure 4 yes Figure 3 Magnified schematic diagram of the middle area.

[0022] Figure 5 It is a schematic diagram of a bottom guard plate according to an embodiment of the utility model.

[0023] Reference numerals:

[0024] 100. Subframe assembly;

[0025] 10. a first crossbeam; 11. a first connecting surface;

[0026] 20. second cross beam; 21. second connecting surface;

[0027] 30, bottom guard plate; 31, guard plate body; 32, first flange; 321, first sub-flange; 322, second sub-flange; 33, second flange; 331, third sub-flange; 332, fourth sub-flange; 34, third flange; 341, fifth sub-flange; 342, sixth sub-flange; 35, fourth flange; 351, seventh sub-flange; 352, eighth sub-flange;

[0028] A. Length direction; B. Width direction; C. Height direction. DETAILED DESCRIPTION

[0029] The embodiments of the present invention are described in detail below. The embodiments described with reference to the accompanying drawings are exemplary. Figure 1-Figure 5 The sub-frame assembly 100 according to the embodiment of the present invention is described, comprising: a first cross beam 10, a second cross beam 20 and a bottom guard plate 30. The sub-frame assembly 100 has a length direction A, a width direction B and a thickness direction C.

[0030] Specifically, if Figure 1-Figure 5 As shown, the first cross beam 10 and the second cross beam 20 both have a connecting surface, which is a plane; the bottom guard plate 30 is arranged between the first cross beam 10 and the second cross beam 20, and the two ends of the bottom guard plate 30 are respectively connected to the connecting surfaces of the corresponding ends.

[0031] Combination Figure 1-5, the first crossbeam 10 and the second crossbeam 20 extend along the width direction B of the sub-frame assembly 100, and the first crossbeam 10 and the second crossbeam 20 are arranged at intervals along the length direction A of the sub-frame assembly 100. The connection surface of the first crossbeam 10 and the second crossbeam 20 is arranged on the side where the first crossbeam 10 and the second crossbeam 20 are adjacent to each other along the length direction A of the sub-frame assembly 100. The bottom guard plate 30 and the first crossbeam 10 and the second crossbeam 20 brackets are fixedly connected by welding. The welding connection method has the characteristics of high connection strength, low production cost, adaptability to various complex structures and simple and quick operation, which can make the connection between the bottom guard plate 30 and the first crossbeam 10 and the second crossbeam 20 reliable and firm.

[0032] According to the sub-frame assembly 100 of the embodiment of the utility model, the bottom guard plate 30 of the sub-frame assembly 100 is respectively welded to the connection surfaces of the first cross beam 10 and the second cross beam 20, and the connection surfaces are planes, so as to reduce the difficulty of welding between the bottom guard plate 30 and the first cross beam 10 and the second cross beam 20, ensure the welding quality of the end of the weld, and increase the contact area between the bottom guard plate 30 and the first cross beam 10 and the second cross beam 20. At the same time, the weld can avoid the fillet position of the first cross beam 10 and the second cross beam 20, effectively reduce the stress concentration at the end of the weld when subjected to load, improve the durability of the weld, and ensure the product quality of the sub-frame assembly 100.

[0033] According to some embodiments of the present invention, Figure 1-4 As shown, the connecting surface includes: a first connecting surface 11 and a second connecting surface 21, the first connecting surface 11 is located on the side of the first beam 10 adjacent to the second beam 20; the second connecting surface 21 is located on the side of the second beam 20 adjacent to the first beam 10, the first connecting surface 11 is opposite to the second connecting surface 21, one end of the bottom guard plate 30 is connected to the first connecting surface 11, and the other end of the bottom guard plate 30 is connected to the second connecting surface 21.

[0034] The first connection surface 11 of the first cross beam 10 is located at a side of the first cross beam 10 adjacent to the center of the sub-frame assembly 100 along the length direction A of the sub-frame assembly 100, and the second connection surface 21 of the second cross beam 20 is located at a side of the second cross beam 20 adjacent to the first cross beam 10 along the length direction A of the sub-frame assembly 100. The first connection surface 11 and the second connection surface 21 are arranged opposite to each other along the length direction A of the sub-frame assembly 100. One end of the bottom guard plate 30 along the length direction A of the sub-frame assembly 100 is connected to the first connection surface 11, and the other end of the bottom guard plate 30 along the length direction A of the sub-frame assembly 100 is connected to the second connection surface 21.

[0035] Therefore, the setting of the first connecting surface 11 and the second connecting surface 21 facilitates the connection between the bottom guard plate 30 and the first cross beam 10 and the second cross beam 20, which can simplify the assembly difficulty of the bottom guard plate 30, enhance the connection strength between the bottom guard plate 30 and the first cross beam 10 and the second cross beam 20, and improve the overall structural strength of the subframe assembly 100.

[0036] According to some embodiments of the present invention, Figure 2 and Figure 4 As shown, the bottom guard plate 30 includes: a guard plate body 31, a first flange 32 and a second flange 33. The first flange 32 is arranged at one end of the guard plate body 31 adjacent to the first cross beam 10, and the first flange 32 is arranged on both sides of the guard plate body 31 along the width direction B of the guard plate body 31 and is respectively bent toward the center away from the guard plate body 31, and the first flange 32 is connected to the first connecting surface 11; the second flange 33 is arranged at one end of the guard plate body 31 adjacent to the second cross beam 20, and the second flange 33 is arranged on both sides of the guard plate body 31 along the width direction B of the guard plate body 31 and is respectively bent toward the center away from the guard plate body 31, and the second flange 33 is connected to the second connecting surface 21.

[0037] The width direction B of the guard plate body 31 is the same as the width direction B of the sub-frame assembly 100. The first flange 32 is provided at one end of the guard plate body 31 adjacent to the first connecting surface 11 along the length direction A. The first flange 32 is formed by bending a portion of the guard plate body 31 along the width direction B toward a direction away from the center of the guard plate body 31. The first flange 32 and the first connecting surface 11 are arranged opposite to each other along the length direction A of the sub-frame assembly 100. A side surface of the first flange 32 adjacent to the first crossbeam 10 along the length direction A contacts and connects with the first connecting surface 11. The first flange 32 includes a first sub-flange 321 and a second sub-flange 322, which are respectively located on both sides of the guard plate body 31 along the width direction B.

[0038] The second flange 33 is arranged at the other end of the guard plate body 31 adjacent to the second connecting surface 21 along the length direction A. The second flange 33 is formed by bending a portion of the guard plate body 31 along the width direction B toward a direction away from the center of the guard plate body 31. The second flange 33 and the second connecting surface 21 are arranged opposite to each other along the length direction A of the sub-frame assembly 100. A side surface of the second flange 33 adjacent to the second cross beam 20 along the length direction A is in contact with and connected to the second connecting surface 21. The second flange 33 includes a third sub-flange 331 and a fourth sub-flange 332, which are respectively located on both sides of the guard plate body 31 along the width direction B.

[0039] Therefore, the setting of the first flange 32 is convenient for increasing the contact area between the bottom guard plate 30 and the first cross beam 10, and the setting of the second flange 33 is convenient for increasing the contact area between the bottom guard plate 30 and the second cross beam 20, thereby enhancing the connection strength between the bottom guard plate 30 and the first cross beam 10 and the second cross beam 20.

[0040] According to some embodiments of the present invention, Figure 2 As shown, the width of the first flange 32 is L1, L1 satisfies: 15mm≤L1≤20mm; or the width of the second flange 33 is L2, L2 satisfies: 15mm≤L2≤20mm. Or the widths of the first flange 32 and the second flange 33 are both within the range of 15mm-20mm.

[0041] If the widths L1 and L2 of the first flange 32 and the second flange 33 are less than 15 mm, the widths of the first flange 32 and the second flange 33 are small, resulting in too small a contact area between the first flange 32 and the first connection surface 11, and between the second flange 33 and the second connection surface 21, which is not conducive to the connection strength between the first flange 32 and the first connection portion, and between the second flange 33 and the second connection surface 21. If the widths L1 and L2 of the first flange 32 and the second flange 33 are greater than 20 mm, the contact area between the first flange 32 and the first connection surface 11, and between the second flange 33 and the second connection surface 21 is too large, resulting in a waste of material of the bottom guard plate 30. For example, L1 = 18 mm, L2 = 18 mm.

[0042] Therefore, by limiting the width of the first flange 32 and the second flange 33 , the production cost of the bottom guard plate 30 can be reduced while ensuring the connection strength between the bottom guard plate 30 and the first cross beam 10 and the second cross beam 20 .

[0043] According to some embodiments of the present invention, Figure 4 and Figure 5 As shown, the bottom guard plate 30 also includes: a third flange 34, the third flange 34 is arranged on both sides of the guard plate body 31 along the width direction B of the guard plate body 31, one end of the third flange 34 is connected to the guard plate body 31, and the other end of the third flange 34 extends along the thickness direction C of the guard plate body 31 and is bent toward the center of the guard plate body 31.

[0044] The guard plate body 31 has a length direction A and a thickness direction C, and the length direction A and the thickness direction C of the guard plate body 31 are the same as the length direction A and the thickness direction C of the sub-frame assembly 100. The third flange 34 extends along the length direction A of the guard plate body 31, and the third flange 34 is formed by bending a part of both ends of the guard plate body 31 along the width direction B toward one side of the guard plate body 31 along the thickness direction C of the guard plate body 31. The third flange 34 includes a fifth sub-flange 341 and a sixth sub-flange 342, and the fifth sub-flange 341 and the sixth sub-flange 342 are respectively located on both sides of the guard plate body 31 along the width direction B. One end of the fifth sub-flange 341 along the length direction A of the guard plate body 31 is connected to the first sub-flange 321, and the other end of the fifth sub-flange 341 along the length direction A of the guard plate body 31 is connected to the third sub-flange 331. One end of the sixth sub-flange 342 along the length direction A of the guard plate body 31 is connected to the second sub-flange 322 , and the other end of the sixth sub-flange 342 along the length direction A of the guard plate body 31 is connected to the fourth sub-flange 332 .

[0045] Therefore, the setting of the third flange 34 is used to improve the overall rigidity of the bottom guard plate 30, which can reduce the stress concentration at the ends of the weld between the first flange 32 and the second flange 33 of the bottom guard plate 30 when the load is applied, prevent the weld between the bottom guard plate 30 and the first cross beam 10 and the second cross beam 20 from cracking, avoid problems such as abnormal noise or welding failure of the bottom guard plate 30, and extend the service life of the sub-vehicle assembly.

[0046] According to some embodiments of the present invention, Figure 4 As shown, the width of the third flange 34 is L3, and L3 satisfies: 10mm≤L3≤15mm. If the width L3 of the third flange 34 is less than 10mm, the width of the third flange 34 is small, resulting in a weak structural strength of the third flange 34, a poor load bearing capacity of the third flange 34, a small rigidity of the bottom guard plate 30 guard plate body 31, and easy deformation and damage. If the width L3 of the third flange 34 is greater than 15mm, the width of the third flange 34 is too wide, which is not conducive to reducing the production cost of the bottom guard plate 30.

[0047] Therefore, by limiting the width of the third flange 34, the structure of the bottom guard plate 30 can be optimized, the load-bearing capacity of the bottom guard plate 30 can be enhanced, and the structural strength of the weld between the bottom guard plate 30 and the first crossbeam 10 and the second crossbeam 20 can be ensured while satisfying the structure and fatigue strength of the bottom guard plate 30.

[0048] According to some embodiments of the present invention, Figure 4 and Figure 5As shown, the first flange 32, the second flange 33 and the third flange 34 have an arc transition with the guard plate body 31. The connection between the first flange 32, the second flange 33 and the main board part is an arc transition. Therefore, the setting of the arc transition at the connection between the first flange 32, the second flange 33 and the third flange 34 and the guard plate body 31 can reduce the sudden change of shape, avoid the edge stress and welding stress concentration at the corner of the first flange 32, the second flange 33 and the third flange 34 and the guard plate body 31, so as to improve the reliability and stability of the connection between the first flange 32, the second flange 33 and the third flange 34 and the guard plate body 31, and can also improve the overall aesthetics of the bottom guard plate 30.

[0049] According to some embodiments of the present invention, Figure 2 and Figure 5 As shown, it also includes: a fourth flange 35, which is arranged at both ends of the guard plate body 31 along the length direction A of the guard plate body 31, and the fourth flange 35 is connected to the first flange 32 and the second flange 33 respectively.

[0050] The fourth flange 35 is formed by a portion of the two end portions of the guard plate body 31 along the length direction A extending away from the center of the guard plate body 31 along the length direction A. The fourth flange 35 extends along the width direction B of the guard plate body 31. The fourth flange 35 includes a seventh sub-flange 351 and an eighth sub-flange 352. The seventh sub-flange 351 is connected to the first flange 32, and the eighth sub-flange 352 is connected to the second flange 33. The first flange 32, the second flange 33 and the fourth flange 35 are in arc transition. The connection between the first flange 32, the second flange 33 and the fourth flange 35 is adapted to the fillet area of ​​the first crossbeam 10 and the second crossbeam 20. The fourth flange 35 is connected to the first crossbeam 10 and the second crossbeam 20 along the side surface of the thickness direction C of the sub-frame assembly 100.

[0051] Therefore, the setting of the fourth flange 35 can further increase the contact area between the bottom guard plate 30 and the first cross beam 10 and the second cross beam 20, and strengthen the connection strength between the bottom guard plate 30 and the first cross beam 10 and the second cross beam 20. The fourth flange 35 is respectively connected to the first flange 32 and the second flange 33 and can also enhance the structural strength of the first flange 32 and the second flange 33, reduce the stress on the first flange 32 and the second flange 33, enhance the overall stiffness of the bottom guard plate 30, and extend the service life of the bottom guard plate 30.

[0052] According to some embodiments of the present invention, Figure 5 As shown, the bottom guard plate 30 is an integrally formed part.

[0053] The one-piece molding process is relatively simple, and the processing of the guard plate body 31, the first flange 32, the second flange 33, the third flange 34 and the fourth flange 35 can be completed in one mold, which can greatly reduce the production time and cost of the bottom guard plate 30, and at the same time improve the production accuracy and consistency of the bottom guard plate 30. In addition, there are no interfaces or other structures inside the one-piece molded part, and there is no problem of weak points at the interface. Therefore, the bottom guard plate 30 is an one-piece molded part, which is conducive to improving the structural strength of the bottom guard plate 30, improving the manufacturing accuracy of the bottom guard plate 30, stabilizing the product dimensional accuracy, and ensuring the product quality of the bottom guard plate 30. At the same time, the one-piece molded part does not require an assembly process and can be directly installed, which is convenient for the production and subsequent maintenance of the bottom guard plate 30.

[0054] The vehicle according to the second embodiment of the utility model comprises the subframe assembly 100 according to the first embodiment of the utility model.

[0055] The subframe assembly 100 is arranged at the bottom of the vehicle. When the vehicle is traveling on an unpaved road or a road with relatively bad conditions, the bottom of the vehicle often drags. The subframe assembly 100 is provided with a bottom guard plate 30 to protect the chassis and other key parts of the vehicle from damage.

[0056] According to the vehicle of the embodiment of the utility model, by applying the subframe assembly 100 described in the above embodiment, the structural strength of the subframe assembly 100 can be enhanced, the installation of the bottom guard plate 30 on the subframe assembly 100 can be made more reliable and stable, the protective effect of the bottom guard plate 30 on the vehicle can be enhanced, the damage to the vehicle during driving can be reduced, and the later maintenance cost of the vehicle can be reduced, thereby improving the reliability of the vehicle.

[0057] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0058] In the description of the present utility model, "first feature" and "second feature" may include one or more of the features. In the description of the present utility model, "plurality" means two or more. In the description of the present utility model, the first feature "above" or "below" the second feature may include the first and second features being in direct contact, or the first and second features being in contact not directly but through another feature between them. In the description of the present utility model, the first feature "above", "above" and "above" the second feature include the first feature being directly above and obliquely above the second feature, or simply means that the first feature is higher in level than the second feature.

[0059] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example.

[0060] Although the embodiments of the present invention have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A subframe assembly, characterized in that: include: A first crossbeam and a second crossbeam, wherein the first crossbeam and the second crossbeam both have a connecting surface, and the connecting surface is a plane; A bottom guard plate is arranged between the first cross beam and the second cross beam, and two ends of the bottom guard plate are respectively connected to the connecting surfaces at corresponding ends.

2. The subframe assembly according to claim 1, characterized in that: The connection surface comprises: a first connecting surface, the first connecting surface being located on a side of the first crossbeam adjacent to the second crossbeam; A second connecting surface, the second connecting surface is located on a side of the second cross beam adjacent to the first cross beam, the first connecting surface is opposite to the second connecting surface, one end of the bottom guard plate is connected to the first connecting surface, and the other end of the bottom guard plate is connected to the second connecting surface.

3. The subframe assembly according to claim 2, characterized in that: The bottom guard plate comprises: Guard plate body; A first flange, the first flange being arranged at one end of the guard plate body adjacent to the first crossbeam, the first flange being arranged at two sides of the guard plate body along the width direction of the guard plate body and respectively bent away from the center of the guard plate body, the first flange being connected to the first connecting surface; The second flange is arranged at one end of the guard plate body adjacent to the second cross beam, the second flange is arranged on both sides of the guard plate body along the width direction of the guard plate body and is bent toward and away from the center of the guard plate body, and the second flange is connected to the second connecting surface.

4. The subframe assembly according to claim 3, characterized in that: The width of the first flange is L1, and L1 satisfies: 15mm≤L1≤20mm, and / or The width of the second flange is L2, and L2 satisfies: 15mm≤L2≤20mm.

5. The subframe assembly according to claim 3, characterized in that: The bottom guard plate also includes: a third flange, which is arranged on both sides of the guard plate body along the width direction of the guard plate body, one end of the third flange is connected to the guard plate body, and the other end of the third flange extends along the thickness direction of the guard plate body and is bent toward the center of the guard plate body.

6. The subframe assembly according to claim 5, characterized in that: The width of the third flange is L3, and L3 satisfies: 10mm≤L3≤15mm.

7. The subframe assembly according to claim 5, characterized in that: The first flange, the second flange and the third flange are in arc transition with the guard plate body.

8. The subframe assembly according to claim 3, characterized in that: Also includes: A fourth flange, wherein the fourth flange is arranged at both ends of the guard plate body along the length direction of the guard plate body, and the fourth flange is respectively connected to the first flange and the second flange at the corresponding end.

9. The subframe assembly according to any one of claims 1 to 8, characterized in that: The bottom guard plate is an integrally formed part.

10. A vehicle, characterized in that: It comprises a subframe assembly according to any one of claims 1-9.

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