Diffuser assembly and vehicle

Abstract

The present disclosure relates to the technical field of automobile parts, and provides a diffuser assembly and a vehicle. The diffuser assembly comprises a bottom guard plate, a diffuser and a connecting plate. The bottom guard plate, the connecting plate and the diffuser are arranged in sequence along the length direction of the vehicle body, and the connecting plate connects the diffuser and the bottom guard plate. The bottom surface of the bottom guard plate, the bottom surface of the connecting plate and the bottom surface of the diffuser are connected to form a flat surface. The diffuser assembly and the vehicle have the advantages that the vehicle body structure can be kept compact when running at low speed, the airflow flowing through the bottom of the vehicle can be prevented from moving upward along the diffuser too early in the lower area of the rear bumper when running at high speed, the wind resistance and energy consumption of the vehicle when running at high speed are reduced, and the like.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to the technical field of automobile parts, and particularly relates to a diffuser assembly and a vehicle. BACKGROUND

[0002] The diffuser is a covering part located at the lower part of the rear bumper of the automobile, which can optimize the air flow through the bottom of the automobile to reduce the wind resistance of the vehicle.

[0003] However, in the prior art, in order to ensure the passability of the automobile, the diffuser at the lower part of the rear bumper of the automobile is often lifted high to form a large departure angle. Thus, when the automobile is running at high speed, the air flow passing through the bottom of the automobile moves upward along the diffuser at the lower part of the rear bumper too early, which is not conducive to improving the flow speed of the air, reducing the wind resistance, and reducing the energy consumption of the automobile. SUMMARY

[0004] In order to solve or at least partially solve the above technical problems, the present disclosure provides a diffuser assembly and a vehicle.

[0005] The diffuser assembly provided by the present disclosure comprises a bottom guard plate, a diffuser, and a connecting plate.

[0006] The bottom guard plate, the connecting plate, and the diffuser are arranged in sequence along the length direction of the vehicle body, and the connecting plate connects the diffuser and the bottom guard plate.

[0007] The bottom surface of the bottom guard plate, the bottom surface of the connecting plate, and the bottom surface of the diffuser are connected to form a flat surface extending along the length direction of the vehicle body.

[0008] In a possible design, the diffuser assembly further comprises a driving device.

[0009] The driving device is connected with the diffuser and drives the diffuser to reciprocate along the length direction of the vehicle body between a first position and a second position.

[0010] The side of the bottom guard plate is further provided with a receiving part for receiving the connecting plate.

[0011] In the first position, the connecting plate is received in the receiving part, and one side of the diffuser is in butt joint with the edge of the bottom guard plate.

[0012] In the second position, the connecting plate is extended out of the receiving part under the driving of the diffuser, and the bottom surface of the bottom guard plate, the bottom surface of the connecting plate, and the bottom surface of the diffuser are connected to form a flat surface.

[0013] In a possible design, one of the receiving part and the connecting plate is provided with a guide head, and the other is provided with a guide slot.

[0014] The guide head is slidingly inserted into the guide slot.

[0015] In a possible design, the receiving part is a protruding table provided on one side of the bottom guard plate.

[0016] The side table wall of the protruding table opposite to the bottom guard plate is a receiving wall for receiving the connecting plate, and the protruding height of the protruding table gradually decreases in a direction gradually approaching the tail of the bottom guard plate.

[0017] In a possible design, the guide slot is provided on each of the two side table walls of the protruding table corresponding to the width direction of the bottom guard plate.

[0018] The guide head is provided on each of the two side plate walls of the connecting plate corresponding to the guide slot.

[0019] In a possible design, the driving device is connected to the diffuser through a transmission mechanism, and the transmission mechanism is a four-bar linkage mechanism.

[0020] The diffuser is switched from the first position to the second position by the four-bar linkage mechanism in a manner of downward rotation and simultaneously moving away from the bottom guard plate, or the diffuser is switched from the second position to the first position by the four-bar linkage mechanism in a manner of upward rotation and simultaneously moving close to the bottom guard plate.

[0021] In a possible design, the four-bar linkage mechanism includes a limiting block, a connecting rod holder, a first connecting rod, and a second connecting rod.

[0022] The limiting block is fixedly arranged above the bottom guard plate.

[0023] The connecting rod holder is fixedly arranged on one side of the diffuser.

[0024] The first connecting rod has a first end hinged to the limiting block and a second end hinged to the connecting rod holder.

[0025] The second connecting rod has a third end hinged to the limiting block and a fourth end hinged to the connecting rod holder.

[0026] The length of the first connecting rod is greater than the length of the second connecting rod, and the height of the first end is higher than the height of the third end.

[0027] In a possible design, a plurality of four-bar linkage mechanisms are arranged along the width direction of the bottom guard plate, and the driving device is drivingly connected to at least one of the four-bar linkage mechanisms.

[0028] In a possible design, the diffuser assembly further includes a rear bumper

[0029] In the first position, a first side of the diffuser is butted against a tail of the underguard in a horizontal direction, and a second side of the diffuser is butted against the rear bumper in a vertical direction.

[0030] In the second position, the second side of the diffuser is spaced apart from the rear bumper in the vertical direction.

[0031] In addition, the application further provides a vehicle including a vehicle body and the diffuser assembly.

[0032] In a possible design, the vehicle further includes a controller.

[0033] The controller is electrically connected to a speedometer in the vehicle body and the driving device in the diffuser assembly, respectively.

[0034] The controller can regulate the working state of the driving device according to the detection information of the speedometer.

[0035] Compared with the prior art, the technical scheme provided by the embodiments of the present disclosure has the following advantages:

[0036] The underguard, the connecting plate and the diffuser in the embodiments of the present disclosure are arranged in sequence along the length direction of the vehicle body, and the connecting plate connects the diffuser and the underguard, and the bottom surface of the underguard, the bottom surface of the connecting plate and the bottom surface of the diffuser are connected to form a flat surface. One side of the diffuser is connected to the underguard in the same direction through the connecting plate, so that the bottom surface of the underguard, the bottom surface of the connecting plate and the bottom surface of the diffuser are connected to form a flat surface to form a longer and gapless flat area, which can effectively prevent the airflow flowing through the bottom of the vehicle from moving upward along the diffuser too early in the lower area of the rear bumper, and finally achieve the effects of improving the flow speed of the air and reducing the wind resistance, thereby reducing the energy consumption of the vehicle during high-speed driving.

[0037] In addition, the embodiments of the present disclosure further provide a vehicle, which all include the above-mentioned diffuser assembly and can achieve all the beneficial effects of the diffuser assembly, which will not be described here. BRIEF DESCRIPTION OF DRAWINGS

[0038] The accompanying drawings, which are incorporated into and form a part of the specification, illustrate embodiments consistent with the present disclosure and, together with the description, serve to explain the principles of the disclosure.

[0039] In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, for those of ordinary skill in the art, other drawings can also be obtained based on these drawings without any creative effort.

[0040] Figure 1 A cross-sectional view of a diffuser assembly according to an embodiment of the present disclosure in a first position;

[0041] Figure 2 A cross-sectional view of a diffuser assembly according to an embodiment of the present disclosure in a second position;

[0042] Figure 3 A schematic view of a diffuser assembly according to an embodiment of the present disclosure in a first position;

[0043] Figure 4 A schematic view of a diffuser assembly according to an embodiment of the present disclosure in a second position;

[0044] Figure 5 A schematic view of a transmission mechanism in a diffuser assembly according to an embodiment of the present disclosure.

[0045] Reference signs:

[0046] 1, drive device; 11, transmission mechanism; 111, limit block; 112, first connecting rod; 113, second connecting rod; 114, connecting rod frame; 2, diffuser; 21, connecting plate; 3, bottom guard plate; 31, storage part; 311, guide groove; 4, rear bumper. DETAILED DESCRIPTION

[0047] In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, for those of ordinary skill in the art, other drawings can also be obtained based on these drawings without any creative effort; and the embodiments in the specification are only a part of the embodiments of the present disclosure, rather than all the embodiments.

[0048] In the following description, many specific details are set forth in order to fully understand the present disclosure, but the present disclosure can also be implemented in other ways different from those described herein; obviously, the embodiments in the specification are only a part of the embodiments of the present disclosure, rather than all the embodiments.

[0049] In combination with Figure 1 , Figure 2 , Figure 3 and Figure 4As shown, the embodiment of the present disclosure provides a diffuser assembly, which comprises a bottom guard plate 3, a diffuser 2 and a connecting plate 21; the bottom guard plate 3, the connecting plate 21 and the diffuser 2 are arranged in sequence along the length direction of the vehicle body, and the connecting plate 21 connects the diffuser 2 and the bottom guard plate 3; wherein the bottom surface of the bottom guard plate 3, the bottom surface of the connecting plate 21 and the bottom surface of the diffuser 2 are connected to form a flat surface extending along the length direction of the vehicle body.

[0050] Compared with the prior art, the bottom surface of the bottom guard plate, the bottom surface of the connecting plate and the bottom surface of the diffuser are connected to form a flat surface, which forms a longer and gapless flat area, so that the air flow passing through the bottom of the vehicle can be effectively prevented from moving upward along the diffuser too early in the lower area of the rear bumper, and finally the effect of improving the flow speed of the air and reducing the wind resistance is realized, thereby reducing the energy consumption of the vehicle when driving at high speed.

[0051] Further, the diffuser assembly further comprises a driving device 1; the diffuser 2 is movably connected to the bottom guard plate 3 through the connecting plate 21; the driving device 1 is drivingly connected to the diffuser 2 through a transmission mechanism 11 and drives the diffuser 2 to reciprocate along the length direction of the vehicle body between a first position and a second position.

[0052] Wherein, one side of the bottom guard plate 3 is further provided with a receiving portion 31 for receiving the connecting plate 21; in the first position, the connecting plate 21 is received in the receiving portion 31, and one side of the diffuser 2 is directly flushly connected to the bottom guard plate 3; in the second position, the connecting plate 21 extends out of the receiving portion 31, and one side of the diffuser 2 is connected to the bottom guard plate 3 through the connecting plate 21.

[0053] The diffuser assembly can be applied to various types of vehicles, specifically but not limited to small cars, SUVs and the like, and the diffuser assembly can be switched and adjusted according to the driving state of the vehicle during use. Specifically, when the vehicle is in a low-speed state, the wind speed at the bottom guard plate 3 is low, and the wind resistance of the vehicle body is small. At this time, the diffuser 2 can be switched and kept in the first position by the driving device 1, so that the connecting plate 21 is accommodated in the accommodation portion 31, one side of the diffuser 2 is directly connected with the tail of the bottom guard plate 3, the bottom guard plate 3 and the diffuser 2 form an integral shape, and the vehicle body can keep a compact structure; when the vehicle is in a high-speed state, the wind speed at the bottom guard plate 3 is high, and the wind resistance of the vehicle body is large. At this time, the diffuser 2 can be switched and kept in the second position by the driving device 1, so that the connecting plate 21 extends out of the accommodation portion 31, and one side of the diffuser 2 is connected with the bottom guard plate 3 in the same direction through the connecting plate 21, so that the bottom guard plate 3 and the diffuser 2 form a longer and gapless flat area, which can effectively prevent the airflow flowing through the bottom of the car from moving upward along the diffuser too early in the lower area of the rear bumper, and finally achieve the effect of improving the flow speed of the air and reducing the wind resistance, thereby reducing the energy consumption of the vehicle during high-speed driving.

[0054] In summary, the diffuser assembly provided by the embodiments of the present disclosure can switch the position of the diffuser 2 according to the different driving speeds of the vehicle, so that the vehicle can keep a compact vehicle body structure when driving at low speed, avoid the airflow flowing through the bottom of the car from moving upward along the diffuser too early in the lower area of the rear bumper when driving at high speed, and reduce the wind resistance and energy consumption of the vehicle when driving at high speed.

[0055] In addition, it is worth noting that the driving device 1 switches the actual position of the diffuser 2 through the transmission mechanism 11, which can be manually controlled by the driver or automatically controlled by an electric control device. Moreover, the specific connection mode of the diffuser 2 and the connecting plate 21 can be hinged, flexibly connected, or elastically bent and connected, and the like, which will not be described too much here.

[0056] In an optional scheme of the present embodiment, one of the accommodation portion 31 and the connecting plate 21 is provided with a guide head, and the other is provided with a guide groove 311; the guide head is slidingly inserted into the guide groove 311.

[0057] Specifically, in combination with Figure 1 , Figure 2 and Figure 5Further in detail, at this time, the guide head is arranged in the connecting plate 21, and the guide groove 311 is arranged in the receiving portion 31. The guide head can be specifically arranged as a columnar clamping head, and the guide groove 311 can be specifically arranged as a linear groove. In order to ensure that the guide groove 311 and the guide head can guide and limit the receiving portion 31 and the connecting plate 21 sufficiently, the guide groove 311 and the guide head can be arranged in multiple groups one by one, or one guide groove 311 corresponds to multiple guide heads.

[0058] By arranging the guide groove 311 and the guide head in the receiving portion 31 and the connecting plate 21, the connecting plate 21 can be retracted in the receiving portion 31 more stably, or the connecting plate 21 can be extended from the receiving portion 31 more smoothly, so as to avoid the problem that the connecting plate 21 deviates or is stuck during retraction, thereby affecting the position switching of the diffuser 2.

[0059] In an optional scheme of the embodiment, the receiving portion 31 is a protruding table arranged on one side of the bottom guard plate 3. The table wall on the side opposite to the bottom guard plate 3 is a receiving wall for receiving the connecting plate 21. In addition, along the direction gradually close to the tail of the bottom guard plate 3, the protruding height of the protruding table gradually decreases.

[0060] Specifically, in combination with Figure 1 , Figure 2 and Figure 5 Further in detail, at this time, the receiving portion 31 is specifically arranged as a three-prism-shaped inclined protruding table. In addition, along the direction gradually close to the tail of the bottom guard plate 3, the protruding height of the protruding table uniformly decreases. When the connecting plate 21 is gradually received and moved along the receiving wall in the protruding table, the connecting plate 21 gradually slides obliquely upward. When the connecting plate 21 is completely received in the receiving portion 31, the connecting plate 21 occupies a smaller space in the horizontal direction, so that the internal space utilization rate of the diffuser assembly is higher.

[0061] Alternatively, in the same size of horizontal space, a connecting plate 21 of a larger size specification can be received, so that when the connecting plate 21 is completely extended from the receiving portion 31, the bottom guard plate 3 and the diffuser 2 can form a longer and gapless flat area, so as to better avoid that the airflow flowing through the bottom of the automobile moves upward along the diffuser too early in the lower area of the rear bumper.

[0062] The specific arrangement of the receiving portion 31 has the beneficial effects of simple structure, smaller horizontal space occupied by the received connecting plate 21, or larger size specification of the received connecting plate 21.

[0063] In an optional scheme of the embodiment, the protruding table is respectively provided with a guide groove 311 on the two side table walls corresponding to the width direction of the bottom guard plate 3. The connecting plate 21 is respectively provided with a guide head corresponding to the two side plate walls of the guide groove 311.

[0064] Specifically, in combination withFigure 1 、 Figure 2 and Figure 5 Further details, the guide groove 311 is opened in the two side walls of the convex table and the bottom guard plate 3 extending direction parallel, so that the two mutually facing guide groove 311 can limit the guide head in the vertical direction, horizontal direction at the same time, so that the guide head can only reciprocating motion along the extension direction of the guide groove 311, thereby avoiding the disengagement, limit the problem of jamming in the process of connecting plate 21 received or extended in the convex table.

[0065] In addition, it is worth mentioning that the specific extension direction of the above-mentioned guide groove 311 can be a single inclined upward straight line direction, or can be set to an extension direction of two sections of "inclination + straightness", which can be specifically set flexibly according to different interior space distribution of the vehicle body, and no more limitation is described here.

[0066] In an optional scheme of the embodiment, the driving device 1 is connected with the diffuser 2 through the transmission mechanism 11, and the transmission mechanism 11 is a four-bar linkage mechanism; the diffuser 2 is switched from the first position to the second position by the four-bar linkage mechanism in a manner of downward rotation and simultaneously moving away from the bottom guard plate 3, or the diffuser 2 is switched from the second position to the first position by the four-bar linkage mechanism in a manner of upward rotation and simultaneously moving close to the bottom guard plate 3.

[0067] Specifically, in combination with Figure 1 、 Figure 2 and Figure 5 Further details, the transmission mechanism 11 is specifically set to a four-bar linkage mechanism, and the diffuser 2 is switched from the first position to the second position by the four-bar linkage mechanism in a manner of downward rotation and simultaneously moving away from the bottom guard plate 3, or the diffuser 2 is switched from the second position to the first position by the four-bar linkage mechanism in a manner of upward rotation and simultaneously moving close to the bottom guard plate 3, the diffuser 2 can complete the switching of the position in a more narrow and complex space through the movement path of "rotation + translation", which can avoid the problems of movement interference and limit collision between the diffuser 2 and the bottom guard plate 3 and the rear bumper 4, and can also set more components between the diffuser 2 and the rear bumper 4, such as sealing components for improving sealing performance, butt joint components for increasing butt joint area, etc.

[0068] Of course, the above-mentioned transmission mechanism 11 can also be set to a single translation mechanism, a single rotation mechanism or a double transmission mechanism of translation and rotation, as long as the movement path of the diffuser 2 is fully calculated when being arranged to avoid the problem of movement interference.

[0069] In an optional solution of the embodiment, the four-bar linkage mechanism comprises a limiting block 111, a connecting rod frame 114, a first connecting rod 112 and a second connecting rod 113; the limiting block 111 is fixedly arranged above the bottom guard plate 3; the connecting rod frame 114 is fixedly arranged on one side of the diffuser 2; the first connecting rod 112 has a first end hinged to the limiting block 111 and a second end hinged to the connecting rod frame 114; the second connecting rod 113 has a third end hinged to the limiting block 111 and a fourth end hinged to the connecting rod frame 114; wherein the length of the first connecting rod 112 is greater than the length of the second connecting rod 113, and the height of the first end is higher than the height of the third end.

[0070] Specifically, in combination with Figure 1 , Figure 2 and Figure 5 further details, the limiting block 111 can be fixedly arranged in the vehicle body by screw connection (i.e. fixedly arranged above the bottom guard plate 3), the connecting rod frame 114 can be arranged on the inner side of the diffuser 2 by integral connection, the first connecting rod 112 and the second connecting rod 113 are respectively hinged to the limiting block 111 and the connecting rod frame 114 in the vertical direction, so that the limiting block 111, the connecting rod frame 114, the first connecting rod 112 and the second connecting rod 113 form a four-bar linkage mechanism, and the length of the first connecting rod 112 is greater than the length of the second connecting rod 113, and the height of the first end is higher than the height of the third end, so that the driving device 1 can be specifically set as a single rotating motor, and when the first end of the first connecting rod 112 is rotated, the connecting rod frame 114 can realize the "rotation + translation" reciprocating motion path.

[0071] The specific arrangement of the above four-bar linkage mechanism has the advantages of simple structure and stable transmission. Moreover, the limiting block 111, the connecting rod frame 114, the first connecting rod 112 and the second connecting rod 113 can all be made of metal or high-strength engineering plastic to ensure the structural strength while minimizing the self-weight.

[0072] In an optional solution of the embodiment, multiple four-bar linkage mechanisms are arranged along the width direction of the bottom guard plate 3, and the driving device 1 is drivingly connected with at least one four-bar linkage mechanism.

[0073] Specifically, in combination with Figure 5 further details, multiple four-bar linkage mechanisms are arranged along the width direction of the bottom guard plate 3, and the driving device 1 is drivingly connected with one four-bar linkage mechanism, so that the remaining four-bar linkage mechanisms not drivingly connected with the driving device 1 are essentially auxiliary virtual constraints between the diffuser 2 and the vehicle body, which can be driven to move to improve the installation stability of the diffuser 2.

[0074] Of course, the above-mentioned drive device 1 can also be provided with two, three or more, through a drive device 1 and a four-bar linkage driving connection, as long as the start-stop position, initial position of each drive device 1 and four-bar linkage are consistent.

[0075] In an optional embodiment of the present embodiment, the diffuser assembly further comprises a rear bumper 4, in the first position, the first side of the diffuser 2 is connected to the tail of the bottom guard plate 3 in the horizontal direction, and the second side of the diffuser 2 is connected to the rear bumper 4 in the vertical direction; in the second position, the second side of the diffuser 2 is spaced apart from the rear bumper 4 in the vertical direction.

[0076] Specifically, in combination with Figure 1 , Figure 2 , Figure 3 and Figure 4 further detailed description, the diffuser 2 is connected to the tail of the bottom guard plate 3 in the horizontal direction in the first position, which can ensure the compactness of the vehicle body structure, and the diffuser 2 is spaced apart from the rear bumper 4 in the vertical direction in the second position, which can avoid the airflow flowing through the bottom of the vehicle moving upward along the diffuser too early in the lower area of the rear bumper.

[0077] Moreover, in order to improve the stability of the connection between the rear bumper 4 and the diffuser 2 in the first position, a connecting inner wall for increasing the connection area can also be provided at the connecting position of the two.

[0078] In addition, the present embodiment also provides a vehicle comprising a vehicle body and the above-mentioned diffuser assembly.

[0079] The vehicle comprises the above-mentioned diffuser assembly, which can realize all the beneficial effects thereof, and will not be described here.

[0080] In an optional embodiment of the present embodiment, the vehicle further comprises a controller; the controller is electrically connected with a speedometer in the vehicle body and the drive device 1 in the diffuser assembly; wherein the controller can control the working state of the drive device 1 according to the detection information of the speedometer.

[0081] Specifically, the controller can be given a judgment threshold, specifically but not limited to 50km / h, when the speedometer in the vehicle body detects that the vehicle speed is greater than 50km / h, the controller controls the working state of the drive device 1 according to the detection information of the speedometer, and drives the diffuser 2 to switch from the first position to the second position; when the speedometer in the vehicle body detects that the vehicle speed is less than 50km / h, the controller controls the working state of the drive device 1 according to the detection information of the speedometer, and drives the diffuser 2 to switch from the second position to the first position.

[0082] The controller is arranged to automatically switch the position of the diffuser 2 according to the real-time driving speed, so that the vehicle can keep a compact structure at low speed, and the diffuser 2 can extend to avoid the air flow passing through the bottom of the vehicle to move upward along the diffuser at the lower part of the rear bumper too early when the vehicle is at high speed, so as to improve the air flow speed and reduce the wind resistance and energy consumption of the vehicle at high speed.

[0083] In summary, the diffuser assembly provided by the embodiments of the present disclosure can switch the position of the diffuser 2 according to different driving positions of the vehicle, so that the vehicle can keep a compact body structure at low speed, and the diffuser 2 can extend to avoid the air flow passing through the bottom of the vehicle to move upward along the diffuser at the lower part of the rear bumper too early when the vehicle is at high speed, so as to reduce the wind resistance and energy consumption of the vehicle at high speed.

[0084] It should be noted that, in this document, relational terms such as“first” and“second”, and the like, are used solely to distinguish one entity or action from another entity or action, without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms“comprises”,“comprising”,“includes”,“including” or any other variation thereof, are intended to cover a non-exclusive inclusion such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but can include other elements not expressly listed or inherent to such process, method, article, or apparatus. An element proceeded by“comprises a...” does not, without more constraints, exclude the existence of additional identical elements in the process, method, article, or apparatus that comprises the element.

[0085] The above description is merely that of the specific embodiments of the present disclosure, and enables a person skilled in the art to understand or implement the present disclosure. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present disclosure. Accordingly, the present disclosure is not intended to be limited to the embodiments described herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A diffuser assembly, characterized in that, include: Bottom guard plate; Diffuser; A connecting plate, the underbody protection plate, the connecting plate, and the diffuser are arranged sequentially along the length of the vehicle body, and the connecting plate connects the diffuser to the underbody protection plate. The bottom surface of the underbody protection plate, the bottom surface of the connecting plate, and the bottom surface of the diffuser are connected to form a flat surface extending along the length of the vehicle body; It also includes a drive unit; The drive device is connected to the diffuser and can drive the diffuser to reciprocate along the length of the vehicle body at a first position and a second position. One side of the bottom protective plate is also provided with a storage part for storing the connecting plate; In the first position, the connecting plate is housed in the housing portion, and one side of the diffuser is abutted against the edge of the bottom protective plate; In the second position, the connecting plate extends out of the receiving part under the action of the diffuser, and the bottom surface of the bottom protective plate, the bottom surface of the connecting plate, and the bottom surface of the diffuser are connected to form a flat surface.

2. The diffuser assembly according to claim 1, characterized in that, In the storage section and the connecting plate, one is provided with a guide head and the other is provided with a guide groove; The guide head is slidably inserted into the guide groove.

3. The diffuser assembly according to claim 2, characterized in that, The storage section is a protrusion provided on one side of the bottom protective plate; The side wall of the raised platform facing away from the bottom protective plate is a receiving wall for accommodating the connecting plate, and the protrusion height of the raised platform gradually decreases along the direction that gradually approaches the tail of the bottom protective plate.

4. The diffuser assembly according to claim 3, characterized in that, The guide grooves are respectively provided in the two side walls of the protruding platform and the bottom guard plate in the width direction; The guide head is respectively provided in the two side walls of the connecting plate and the guide groove.

5. The diffuser assembly according to claim 1, characterized in that, The drive device is connected to the diffuser via a transmission mechanism, and the transmission mechanism is a four-bar linkage. The diffuser switches from the first position to the second position via the four-bar linkage by rotating downwards while simultaneously translating away from the bottom guard plate, or the diffuser switches from the second position to the first position via the four-bar linkage by rotating upwards while simultaneously translating closer to the bottom guard plate.

6. The diffuser assembly according to claim 5, characterized in that, The four-bar linkage includes: A limiting block is fixedly installed above the bottom protective plate; A connecting rod frame is fixedly mounted on one side of the diffuser; The first link has a first end hinged to the limiting block and a second end hinged to the link frame; The second link has a third end hinged to the limiting block and a fourth end hinged to the link frame; The length of the first link is greater than the length of the second link, and the height of the first end is greater than the height of the third end.

7. The diffuser assembly according to any one of claims 1 to 6, characterized in that, The diffuser assembly also includes a rear bumper. In the first position, the first side of the diffuser is horizontally aligned with the rear of the bottom guard plate, and the second side of the diffuser is vertically aligned with the rear bumper. In the second position, the second side of the diffuser is spaced from the rear bumper in a vertical direction.

8. A vehicle, characterized in that, Includes the vehicle body and the diffuser assembly as described in any one of claims 1 to 6.

9. The vehicle according to claim 8, characterized in that, It also includes the controller; The controller is electrically connected to the speed detector in the vehicle body and the drive device in the diffuser assembly, respectively. The controller is used to adjust the working state of the drive device based on the detection information from the speedometer.

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