Flow guide device, bottom guard plate assembly and vehicle

Abstract

The invention relates to a flow guiding device, a bottom protection plate assembly and a vehicle, the flow guiding device comprises a bottom protection plate and at least one flow guiding main body, the flow guiding main body is arranged on the bottom protection plate, and the flow guiding main body is located on the side, close to a vehicle head, of an auxiliary frame suspension structure of the vehicle in the direction from the vehicle head to the vehicle tail of the vehicle; the windward side is formed by the face, deviating from the auxiliary frame suspension structure, of the flow guide body and is a smooth surface, so that airflow does not directly impact on the auxiliary frame suspension structure but impacts on the windward side of the flow guide body, and the airflow impacting on the windward side is finally discharged through the outer side of the auxiliary frame suspension structure. Due to the fact that the windward side is the smooth surface, airflow impacting on the windward side can form a stable flow field, the turbulent flow phenomenon is avoided, the phenomenon that airflow impacts on the auxiliary frame suspension structure, turbulent flow occurs, and wind resistance is increased is effectively avoided, the wind resistance is effectively reduced, and the economical efficiency of a vehicle is improved.

Description

Technical Field

[0001] The present disclosure relates to the technical field of guide devices, and in particular to a guide device, an underbody guard plate assembly and a vehicle. Background Art

[0002] As energy issues become increasingly severe, improving the economy of cars (fuel consumption, driving range) has become one of the key issues that OEMs at home and abroad are concerned about. There is a vital relationship between wind resistance and the economy of cars. For example, for fuel cars, reducing wind resistance can significantly reduce the fuel consumption of fuel cars when driving at high speeds; for electric cars, reducing wind resistance can increase the driving range of electric cars. Therefore, reducing the drag coefficient of cars has become a key issue that major OEMs are concerned about and studying.

[0003] Specifically, when a car is driving, since the subframe suspension structure of the car is the lowest point of the whole car, that is, the subframe suspension structure is the component with the smallest ground clearance of the whole car, the high-speed airflow generated during the driving of the car will directly impact the subframe suspension structure. Moreover, since the outer contour of the subframe suspension structure is relatively complex, the high-speed airflow impacting the subframe suspension structure will cause serious turbulence, thereby increasing wind resistance and affecting the economy of the car. Summary of the invention

[0004] In order to solve the above technical problems, the present disclosure provides a guide device, an underbody guard plate assembly and a vehicle.

[0005] In a first aspect, the present disclosure provides a flow guide device, comprising a bottom guard plate and at least one flow guide body, wherein the flow guide body is arranged on the bottom guard plate, and in a direction from the front to the rear of a vehicle, the flow guide body is located on a side of a subframe suspension structure of the vehicle close to the front of the vehicle;

[0006] A side of the flow guide body that faces away from the auxiliary frame suspension structure forms a windward surface, and the windward surface is a smooth surface.

[0007] In some embodiments, the deflector body includes a deflector protrusion arranged on the bottom surface of the bottom guard plate and extending in a direction away from the roof of the vehicle, and a side of the deflector protrusion away from the subframe suspension structure forms at least a portion of the windward surface.

[0008] In some embodiments, the guide body and the bottom guard plate are integrally formed.

[0009] In some embodiments, at least a portion of the bottom guard plate corresponding to the sub-frame suspension structure protrudes in a direction away from the roof of the vehicle to form the guide protrusion.

[0010] In some embodiments, the junction between the side edge of the guide protrusion and the bottom guard plate is smoothly transitioned; and / or the junction between the windward surface of the guide protrusion and the bottom guard plate is smoothly transitioned.

[0011] In some embodiments, in the height direction of the vehicle, the bottom surface of the flow guide body is not higher than the lowest point of the sub-frame suspension structure;

[0012] And / or, a dimension of the guide body in a height direction of the vehicle is not less than 30 mm.

[0013] In some embodiments, the subframe suspension structure includes a swing arm, and projections of both side edges of the flow guide body in the vehicle width direction are located outside the swing arm.

[0014] In some embodiments, the subframe suspension structure includes two swing arms spaced apart in the vehicle width direction;

[0015] There are two flow guide bodies, which are spaced apart on the bottom guard plate, and one flow guide body corresponds to one swing arm.

[0016] In some embodiments, the windward surface is an arc-shaped smooth surface that bulges away from the sub-frame suspension structure.

[0017] In a second aspect, the present disclosure provides a bottom guard plate assembly, including a bottom guard plate and a guide device.

[0018] In a third aspect, the present disclosure provides a vehicle including a deflector or an underbody guard plate assembly.

[0019] Compared with the prior art, the technical solution provided by the embodiments of the present disclosure has the following advantages:

[0020] The present invention provides a deflector device, an underbody guard plate assembly and a vehicle. The deflector device includes an underbody guard plate and at least one deflector body. The deflector body is arranged on the underbody guard plate of the vehicle. In the direction from the front to the rear of the vehicle, the deflector body is located on the side of the sub-frame suspension structure of the vehicle close to the front of the vehicle, so that the side of the deflector body away from the sub-frame suspension structure forms a windward surface. The windward surface is a smooth surface, so that the airflow will not directly impact the sub-frame suspension structure, but will impact the windward surface of the deflector body. The airflow impacting the windward surface is finally discharged through the outer side of the sub-frame suspension structure. Since the windward surface is a smooth surface, the airflow impacting the windward surface can form a stable flow field without turbulence, thereby effectively avoiding the phenomenon that the airflow impacts the sub-frame suspension structure and turbulence occurs, resulting in increased wind resistance, thereby effectively reducing wind resistance and improving the economy of the vehicle. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present disclosure and, together with the description, serve to explain the principles of the present disclosure.

[0022] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0023] Figure 1 It is a schematic structural diagram of the flow guide device and the bottom guard plate according to the embodiment of the present disclosure;

[0024] Figure 2 It is a schematic structural diagram of the bottom guard plate assembly and the subframe suspension structure described in the embodiment of the present disclosure.

[0025] Reference numerals:

[0026] 1. deflector body; 11. windward surface; 2. bottom guard plate; 21. first connecting hole; 22. third connecting hole; 23. first fastener; 3. subframe suspension structure; 31. swing arm; 4. reinforcement structure; 41. reinforcement rib. DETAILED DESCRIPTION

[0027] In order to more clearly understand the above-mentioned objectives, features and advantages of the present disclosure, the scheme of the present disclosure will be further described below. It should be noted that the embodiments of the present disclosure and the features in the embodiments can be combined with each other without conflict.

[0028] In the following description, many specific details are set forth to facilitate a full understanding of the present disclosure, but the present disclosure may also be implemented in other ways different from those described herein; it is obvious that the embodiments in the specification are only part of the embodiments of the present disclosure, rather than all of the embodiments.

[0029] Embodiment 1

[0030] Reference Figure 1 to Figure 2 As shown, this embodiment provides a flow guide device, including a bottom guard plate 2 and at least one flow guide body 1. The flow guide body 1 is arranged on the bottom guard plate 2, and in the direction from the front to the rear of the vehicle, the flow guide body 1 is located on the side of the sub-frame suspension structure 3 of the vehicle close to the front of the vehicle. Among them, the side of the flow guide body 1 facing away from the sub-frame suspension structure 3 forms a windward surface 11, and the windward surface 11 is a smooth surface.

[0031] That is, in the direction from the front to the rear of the vehicle, the guide body 1 is located on the side of the sub-frame suspension structure 3 of the vehicle close to the front of the vehicle, which means that in the direction of travel of the vehicle, the guide body 1 is located in front of the sub-frame suspension structure 3 (refer to Figure 1 and Figure 2 The front and rear directions are shown in the figure), so that when the airflow generated by the vehicle during driving flows from the front side to the rear side of the vehicle, the airflow first hits the side of the guide body 1 that is away from the sub-frame suspension structure 3, and the windward surface 11 formed by the side of the guide body 1 that is away from the sub-frame suspension structure 3 is a smooth surface, so that after the airflow hits the windward surface 11 with a smooth surface, a stable flow field can be formed, so as to avoid the problem that the airflow directly hits the sub-frame suspension structure 3 with a complex shape and causes turbulence, thereby increasing the wind resistance. In this way, not only the sub-frame suspension structure 3 can be protected from airflow impact, but also the wind resistance can be effectively reduced, thereby improving the economy of the vehicle.

[0032] In addition, the outer side of the subframe suspension structure 3 specifically refers to the outer side of at least one side of the subframe suspension structure 3 in the width direction of the vehicle. For example, it may be the side of the subframe suspension structure 3 in the width direction of the vehicle close to the center line of the vehicle or the side away from the center line of the vehicle, or it may be both sides of the subframe suspension structure 3 in the width direction of the vehicle.

[0033] It should be noted that the smooth surface may specifically be a plane or a smooth surface with a regular shape such as an arc-shaped smooth surface.

[0034] In specific implementation, when the guide body 1 is located in front of the sub-frame suspension structure 3, the guide body 1 can partially block the sub-frame suspension structure 3 along the width direction of the vehicle, or the guide body 1 can completely block the sub-frame suspension structure 3, so as to fully avoid the problem of increased wind resistance caused by the impact of airflow on the sub-frame suspension structure 3.

[0035] The deflector device provided in the present embodiment includes at least one deflector body 1, which is arranged on the bottom guard plate 2 of the vehicle, and the deflector body 1 is located in front of the sub-frame suspension structure 3 of the vehicle, so that the side of the deflector body 1 facing away from the sub-frame suspension structure 3 forms a windward surface 11, and the windward surface 11 is a smooth surface, so that the airflow will not directly impact the sub-frame suspension structure 3, but impact the windward surface 11 of the deflector body 1, and the airflow impacting the windward surface 11 is finally discharged through the outside of the sub-frame suspension structure 3. Since the windward surface 11 is a smooth surface, the airflow impacting the windward surface 11 can form a stable flow field without turbulence, thereby effectively avoiding the phenomenon that the airflow impacts the sub-frame suspension structure 3 and causes turbulence to increase the wind resistance, thereby effectively reducing the wind resistance and improving the economy of the vehicle.

[0036] Reference Figure 1 to Figure 2 As shown, in some embodiments, the deflector body 1 includes a deflector protrusion arranged on the bottom surface of the bottom guard plate 2 and extending in the direction away from the roof of the vehicle, and the side of the deflector protrusion facing away from the subframe suspension structure 3 is formed as at least a partial windward surface 11.

[0037] That is to say, the guide body 1 is a guide protrusion arranged on the bottom surface of the bottom guard plate 2 and extending downward, so that the overall outer contour shape of the guide body 1 is relatively regular, thereby further avoiding airflow turbulence after airflow impact.

[0038] For example, the guide bump itself can be a rectangular bump or a spherical bump or other regular bumps.

[0039] Alternatively, in other implementations, the deflector body 1 may also be a deflector vertical plate that is disposed on the bottom surface of the bottom guard plate 2 and extends in a direction away from the roof of the vehicle.

[0040] Reference Figure 1 and Figure 2 As shown, in some embodiments, at least a portion of the bottom guard plate 2 corresponding to the subframe suspension structure 3 protrudes toward a direction away from the roof of the vehicle to form a guide protrusion.

[0041] That is to say, the guide protrusion itself is formed by a downward protrusion of at least the part of the bottom guard plate 2 corresponding to the subframe suspension structure 3, and a concave cavity is formed on the back side of the guide protrusion, so that it can be easily manufactured and the problem of heavy weight and high manufacturing cost of the guide body 1 caused by the additional arrangement of the guide protrusion on the bottom guard plate 2 can be avoided.

[0042] Reference Figure 1 and Figure 2 As shown, in some embodiments, the junction between the side edge of the guide protrusion and the bottom guard plate 2 is smoothly transitioned, so that the junction is relatively smooth, so as to further avoid the phenomenon of turbulence caused by airflow impact at the junction, thereby reducing wind resistance and improving the economy of the vehicle.

[0043] For example, the side edge may refer to the guide protrusion in the width direction of the vehicle (refer to Figure 1 At least one side edge in the left-right direction (as shown).

[0044] In some embodiments, the junction between the windward surface 11 of the guide protrusion and the bottom guard plate 2 is smoothly transitioned, making the junction smoother to further avoid the occurrence of turbulence caused by airflow impact at the junction, thereby reducing wind resistance and improving the economy of the vehicle.

[0045] In addition, the junction between the windward surface 11 of the guide protrusion and the bottom guard plate 2 is smoothly transitioned, so that there is no gap between the windward surface 11 and the bottom guard plate 2, and the problem of airflow flowing backward through the gap and impacting the subframe suspension structure 3, resulting in increased wind resistance, can be avoided.

[0046] Specifically, the guide protrusion can be set on the bottom surface of the bottom guard plate 2, for example, the guide protrusion can be directly welded and fixed on the bottom surface of the bottom guard plate 2, or screwed on the bottom surface of the bottom guard plate 2, or it can be integrally formed with the bottom guard plate 2, so as to save manufacturing steps and effectively improve the structural strength of the bottom guard plate 2. In addition, by integrally forming the guide protrusion with the bottom guard plate 2, it is also unnecessary to open a mold separately, thereby reducing the manufacturing cost. In addition, the guide protrusion and the bottom guard plate 2 can be made of the same material, such as plastic, so that it is light in weight, which is conducive to realizing lightweight design and reducing the weight of the entire vehicle.

[0047] Reference Figure 1 and Figure 2 As shown, in some embodiments, in the height direction of the vehicle, the bottom surface of the guide body 1 is not higher than the lowest point of the sub-frame suspension structure 3, so that the sub-frame suspension structure 3 can be effectively shielded, so that the high-speed airflow generated during the driving of the vehicle can impact the guide body 1 and then be discharged from the outside of the sub-frame suspension structure 3, thereby bypassing the sub-frame suspension structure 3, avoiding the high-speed airflow from impacting the sub-frame suspension structure 3 to form a high-pressure area and turbulence, thereby reducing wind resistance.

[0048] In some embodiments, the dimension of the guide body 1 in the height direction of the vehicle is not less than 30 mm, so that at this height, the lowest point of the guide body 1 is lower than the lowest point of the sub-frame suspension structure 3, thereby effectively shielding the sub-frame suspension structure 3, so that the high-speed airflow generated during the driving of the vehicle can be discharged after passing through both sides of the guide body 1, thereby bypassing the sub-frame suspension structure 3, avoiding the high-speed airflow impacting the sub-frame suspension structure 3 to form a high-pressure area and turbulence, thereby reducing wind resistance and improving the economy of the vehicle.

[0049] In addition, experiments have found that by providing a guide body 1 with a height of not less than 30 mm on the front side of the subframe suspension structure 3, the drag coefficient of the entire vehicle during driving can be reduced by 0.005, and the vehicle's cruising range can be further increased by 4 kilometers, thereby effectively improving the vehicle's economy.

[0050] Exemplarily, the height of the guide body 1 can be 30 mm, or the height of the guide body 1 can be 31 mm, or the height of the guide body 1 can be 32 mm. The specific setting height of the guide body 1 can be set according to actual needs, and this embodiment does not make any specific limitation on this.

[0051] In addition, the lowest point of the guide body 1 can be flush with the lowest point of the swing arm 31 or lower than the lowest point of the swing arm 31, so as to fully shield the swing arm 31, reduce wind resistance, and improve the economy of the vehicle. Alternatively, the height difference between the lowest point of the guide body 1 and the lowest point of the swing arm 31 can also be plus or minus 5 mm, so as to effectively shield the swing arm 31.

[0052] Reference Figure 1 to Figure 2 As shown, in some embodiments, the subframe suspension structure 3 includes a swing arm 31 , and the projections of the two side edges of the guide body 1 in the vehicle width direction are located outside the swing arm 31 .

[0053] That is to say, along the width direction of the vehicle, the two side edges of the guide body 1 are flush with the outer side of the swing arm 31 along the width direction of the vehicle or protrude from the outer side of the swing arm 31 along the width direction of the vehicle, so that the guide body 1 can completely block the swing arm 31 in the width direction of the vehicle to avoid high-speed airflow impacting the swing arm 31 to form a high-pressure area and turbulence, thereby reducing wind resistance and improving the economy of the vehicle.

[0054] The two side edges of the guide body 1 mentioned here refer to the two side edges of the guide body 1 along the width direction of the vehicle (refer to Figure 1 The outer side of the swing arm 31 refers to the outer side of at least one side of the swing arm 31 in the width direction of the vehicle.

[0055] In specific implementation, the swing arm 31 of the sub-frame suspension structure 3 is usually the lowest component of the entire sub-frame suspension structure 3, so the swing arm 31 is shielded from airflow by arranging the flow guide body 1 on the front side of the swing arm 31. In addition, along the width direction of the vehicle, the width of the flow guide body 1 is not less than the width of the swing arm 31, so that the swing arm 31 can be fully shielded, so that the airflow impacts the regularly shaped windward surface 11 of the flow guide body 1 on the front side of the swing arm 31, so that a stable flow field can be formed after the airflow impacts the windward surface 11, so as to avoid the problem of turbulence caused by the airflow directly impacting the complex-shaped swing arm 31 and thus increasing the wind resistance. In this way, it can not only achieve the function of protecting the swing arm 31 from airflow impact, but also effectively reduce the wind resistance and improve the economy of the vehicle.

[0056] Reference Figure 1 and Figure 2 As shown, in some embodiments, the subframe suspension structure 3 includes two Figure 1 There are two guide bodies 1, which are spaced apart on the bottom guard plate 2, and one guide body 1 corresponds to one swing arm 31.

[0057] In a specific implementation, the sub-frame suspension structure 3 specifically includes two swing arms 31 , so two air guide bodies 1 can be provided, so that the two swing arms 31 can be shielded from airflow respectively by the two air guide bodies 1 .

[0058] In addition, in the present embodiment, the guide body 1 may be provided only on the front side of the swing arm 31 of the sub-frame suspension structure 3 to shield the airflow to the swing arm 31; the guide body 1 may also be provided on the front side of the position where the entire sub-frame suspension structure 3 is located, so that the guide body 1 can shield the airflow to the entire sub-frame suspension structure 3.

[0059] Reference Figure 1 to Figure 2 As shown, in some embodiments, the windward surface 11 is an arc-shaped smooth surface that protrudes in the direction away from the sub-frame suspension structure 3. The arc-shaped smooth surface can effectively guide and divert the airflow, so as to accelerate the rapid discharge of the airflow from the guide body 1 on both sides along the width direction of the vehicle without impacting the sub-frame suspension structure 3 on the rear side, thereby achieving the effect of reducing wind resistance, improving the economy of the vehicle, and protecting the sub-frame suspension structure 3 from airflow impact.

[0060] Exemplarily, the arc-shaped smooth surface may be, for example, an arc smooth surface, or may also be a conical smooth surface.

[0061] Reference Figure 1 and Figure 2 As shown, in some embodiments, a reinforcing structure 4 is provided on one side of the guide body 1 facing the roof of the vehicle, thereby effectively improving the structural strength of the guide body 1 and thereby avoiding structural damage after airflow impact that affects the normal use of the guide body 1.

[0062] In specific implementation, the reinforcing structure 4 can be integrally formed with the flow guide body 1 , thereby saving manufacturing steps and further effectively improving the structural strength of the flow guide body 1 .

[0063] Reference Figure 1 and Figure 2 As shown, in some embodiments, the reinforcement structure 4 includes at least two reinforcement ribs 41, and the at least two reinforcement ribs 41 are arranged at intervals along the width direction of the vehicle, so that the structural strength of the flow guide body 1 can be jointly improved by the multiple reinforcement ribs 41, so that the structural strength of the flow guide body 1 can be further improved. Specifically, the number of reinforcement ribs 41 can be two or more. The specific number of reinforcement ribs 41 can be set according to actual needs, and this embodiment does not specifically limit this.

[0064] Embodiment 2

[0065] Reference Figure 1 to Figure 2As shown, this embodiment also provides a bottom guard plate assembly, including a bottom guard plate 2 and a guide device.

[0066] The specific structure and implementation principle of the guide device in this embodiment are the same as the structure of the guide device provided in Example 1, and can bring the same or similar technical effects, which will not be described one by one here, and the details can be referred to the description of Example 1.

[0067] In specific implementation, a first connecting hole 21 can be set on the side of the bottom guard plate 2 close to the sub-frame suspension structure 3, and a second connecting hole is set on the sub-frame suspension structure 3 at a position corresponding to the first connecting hole 21. The bottom guard plate 2 is reliably connected to the sub-frame suspension structure 3 by a first fastener 23 passed through the first connecting hole 21 and the second connecting hole.

[0068] For example, the first connection hole 21 and the second connection hole may be threaded holes, and the first fastener 23 may be a screw or bolt that matches the threaded hole. Alternatively, the first connection hole 21 and the second connection hole may be plain holes, and the first fastener 23 may be a fastening pin that matches the plain hole. In addition, the first connection hole 21 and the second connection hole may both be multiple and correspond one to one, so that the connection reliability between the bottom guard plate 2 and the subframe suspension structure 3 can be further improved through the cooperation of multiple first connection holes 21 and second connection holes.

[0069] In specific implementation, a third connecting hole 22 can be set on the side of the bottom guard plate 2 away from the subframe suspension structure 3, and a fourth connecting hole can be set on the body at a position corresponding to the third connecting hole 22, and the bottom guard plate 2 is fixed to the body by a second fastener passing through the third connecting hole 22 and the fourth connecting hole.

[0070] For example, the third connection hole 22 and the fourth connection hole may be threaded holes, and the second fastener may be a screw or bolt that matches the threaded hole. Alternatively, the third connection hole 22 and the fourth connection hole may be plain holes, and the second fastener may be a fastening pin that matches the plain holes. In addition, the third connection hole and the fourth connection hole may both be multiple and correspond one to one, so that the connection reliability between the bottom guard plate 2 and the vehicle body can be further improved through the cooperation of multiple third connection holes 22 and fourth connection holes.

[0071] Embodiment 3

[0072] Reference Figure 1 to Figure 2 As shown, this embodiment also provides a vehicle, including a guide device or an underbody guard plate assembly.

[0073] The specific structure and implementation principle of the guide device in this embodiment are the same as the structure of the guide device provided in Example 1, and can bring the same or similar technical effects, which will not be described one by one here, and the details can be referred to the description of Example 1.

[0074] The specific structure and implementation principle of the bottom guard plate assembly in this embodiment are the same as the structure of the bottom guard plate assembly provided in Example 2, and can bring the same or similar technical effects, which will not be described one by one here, and the details can be referred to the description of Example 2.

[0075] It should be noted that, in this article, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the term "comprises" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0076] The above description is only a specific embodiment of the present disclosure, so that those skilled in the art can understand or implement the present disclosure. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present disclosure. Therefore, the present disclosure will not be limited to the embodiments described herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A flow guide device, characterized in that: It includes a bottom guard plate and at least one flow guide body; The deflector body is arranged on the bottom guard plate, and in the direction from the front to the rear of the vehicle, the deflector body is located on a side of the subframe suspension structure of the vehicle close to the front of the vehicle; A side of the flow guide body that faces away from the auxiliary frame suspension structure forms a windward surface, and the windward surface is a smooth surface.

2. The flow guiding device according to claim 1, characterized in that: The deflector body includes a deflector protrusion arranged on the bottom surface of the bottom guard plate and extending in a direction away from the roof of the vehicle, and a side of the deflector protrusion away from the subframe suspension structure forms at least a part of the windward surface.

3. The flow guiding device according to claim 2, characterized in that: The flow guide body and the bottom guard plate are integrally formed.

4. The flow guiding device according to claim 3, characterized in that: At least a portion of the bottom guard plate corresponding to the sub-frame suspension structure protrudes in a direction away from the roof of the vehicle to form the guide bump.

5. The flow guiding device according to claim 2, characterized in that: The junction between the side edge of the guide protrusion and the bottom guard plate is smoothly transitioned; and / or the junction between the windward surface of the guide protrusion and the bottom guard plate is smoothly transitioned.

6. The flow guiding device according to any one of claims 1 to 5, characterized in that: In the height direction of the vehicle, the bottom surface of the flow guide body is not higher than the lowest point of the sub-frame suspension structure; And / or, a dimension of the guide body in a height direction of the vehicle is not less than 30 mm.

7. The flow guiding device according to any one of claims 1 to 5, characterized in that: The sub-frame suspension structure comprises a swing arm, and projections of both side edges of the air guide body in the vehicle width direction are located outside the swing arm.

8. The flow guiding device according to any one of claims 1 to 5, characterized in that: The subframe suspension structure includes two swing arms spaced apart in the vehicle width direction; There are two flow guide bodies, which are spaced apart on the bottom guard plate, and one flow guide body corresponds to one swing arm.

9. The flow guiding device according to any one of claims 1 to 5, characterized in that: The windward surface is an arc-shaped smooth surface that protrudes in a direction away from the sub-frame suspension structure.

10. A bottom guard plate assembly, characterized in that: It comprises a bottom guard plate and a flow guiding device as claimed in any one of claims 1 to 9.

11. A vehicle, characterized in that: It comprises the deflector device as described in any one of claims 1 to 9 or the bottom guard plate assembly as described in claim 10.

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