Bottom protection plate, vehicle chassis and vehicle

Abstract

The invention relates to the technical field of vehicles, in particular to a bottom protection plate, a vehicle chassis and a vehicle. The bottom protection plate comprises an oil tank protection plate which is installed on a vehicle chassis and located at the bottom of an oil tank; the fuel tank protection plate comprises a front end close to the head of a vehicle and a tail end close to the tail of the vehicle. The oil tank protection plate obliquely extends in the direction away from the oil tank in the direction from the front end to the tail end. When airflow approaches the oil tank protection plate, at least part of the inclined oil tank protection plate can slowly guide the airflow to flow, the airflow is prevented from vertically impacting the oil tank protection plate to form a high-pressure area, the size of a positive-pressure area of the oil tank protection plate is reduced, and the wind resistance coefficient can be effectively reduced.

Description

Technical Field

[0001] The present disclosure relates to the field of vehicle technology, and in particular to an underbody guard plate, a vehicle chassis and a vehicle. Background Art

[0002] In the extended-range vehicle platform, the fuel tank of the vehicle chassis is usually lower than other parts of the vehicle due to the Z-direction space limitation and the volume limitation of the fuel tank. The bottom guard of the fuel tank is usually U-shaped, resulting in a side plate facing the airflow direction. When the vehicle is driving, the airflow hits the side plate vertically, which will increase the wind resistance and thus increase the energy consumption. Summary of the invention

[0003] In order to solve the above technical problems, the present disclosure provides an underbody guard plate, a vehicle chassis and a vehicle.

[0004] A first aspect of the present disclosure provides a bottom guard plate, comprising:

[0005] A fuel tank guard is installed on the vehicle chassis and is located at the bottom of the fuel tank;

[0006] The fuel tank guard plate includes a front end close to the head of the vehicle and a rear end close to the rear of the vehicle;

[0007] Along the direction from the front end to the rear end, the fuel tank guard plate extends obliquely in a direction away from the fuel tank.

[0008] Furthermore, a connecting plate is provided at the front end of the fuel tank guard plate, and both the connecting plate and the fuel tank guard plate extend along the front-rear direction X of the vehicle;

[0009] Along the front-rear direction X of the vehicle, a first connection portion is formed at the rear end of the connection plate, a second connection portion is formed at the front end of the fuel tank guard plate, and the first connection portion is connected to the second connection portion;

[0010] Along the height direction Z of the vehicle, the height of the area of ​​the connecting plate close to the first connecting part is lower than the height of the area of ​​the fuel tank guard plate close to the second connecting part, and the end of the connecting plate away from the first connecting part is higher than the height of the area of ​​the fuel tank guard plate close to the second connecting part.

[0011] Furthermore, the angle α between the fuel tank guard plate and the horizontal direction satisfies: 3°≤α≤17°.

[0012] Furthermore, a first flange is provided at the front end of the connecting plate, and the first flange extends from the front end of the connecting plate toward the vehicle chassis, and a smooth transition is formed between the first flange and the connecting plate;

[0013] And / or, a second flange is provided at the rear end of the fuel tank guard plate, and the second flange extends from the rear end of the fuel tank guard plate toward the vehicle chassis, and a smooth transition is formed between the second flange and the fuel tank guard plate.

[0014] Furthermore, along the height direction Z of the vehicle, the front end of the connecting plate is flush with the bottom surface of the battery pack.

[0015] Furthermore, along the height direction Z of the vehicle, a distance L from the rear end of the fuel tank guard plate to the plane where the bottom surface of the battery pack is located satisfies: L≥30mm.

[0016] Furthermore, a raised portion protruding toward the vehicle chassis is formed in the area of ​​the fuel tank guard plate near the rear end, and the raised portion is provided with a plurality of first mounting grooves, the first mounting grooves are conical in shape, and a first mounting hole is provided at the bottom end of the first mounting groove.

[0017] Furthermore, the raised portion includes a side plate and a top plate connected to each other, and the angle between the side plate and the top plate is an obtuse angle.

[0018] Furthermore, the connecting plate is provided with a plurality of second mounting grooves, the second mounting grooves are conical, and the bottom ends of the second mounting grooves are provided with second mounting holes;

[0019] And / or, the fuel tank guard plate is provided with a plurality of first reinforcing ribs, the first reinforcing ribs extend in a direction from the front end to the rear end, and the plurality of first reinforcing ribs are arranged at intervals perpendicular to the direction from the front end to the rear end;

[0020] And / or, a surface of the fuel tank guard plate facing the vehicle chassis is provided with a plurality of second reinforcing ribs, and the second reinforcing ribs extend in a direction perpendicular to the front end to the rear end.

[0021] Further, along the width direction (Y) of the vehicle, one end of the fuel tank guard plate is connected to the exhaust pipe guard plate;

[0022] The two ends of the fuel tank guard plate and the exhaust pipe guard plate that are away from each other are respectively provided with a first avoidance portion and a second avoidance portion for forming a rear wheel cover avoidance space;

[0023] The first avoidance portion is formed with a first overlapping edge, and the second avoidance portion is formed with a second overlapping edge;

[0024] A third escape portion for forming an escape space for the exhaust pipe is formed at a connection portion between the oil tank guard plate and the exhaust pipe guard plate.

[0025] Furthermore, one side of the front end of the connecting plate extends forward to form an extension plate, and the extension plate forms a plug-in portion, and the plug-in portion is used to plug and cooperate with the battery side guard plate.

[0026] Furthermore, the extension plate is provided with a plurality of third reinforcing ribs, and the third reinforcing ribs are arranged along a direction from the front end to the tail end, and the plurality of third reinforcing ribs are arranged at intervals along a direction perpendicular to the direction from the front end to the tail end.

[0027] A second aspect of the present disclosure provides a vehicle chassis, comprising the bottom guard plate described in the first aspect.

[0028] A third aspect of the present disclosure provides a vehicle, comprising the vehicle chassis described in the second aspect.

[0029] Compared with the prior art, the technical solution provided by the embodiments of the present disclosure has the following advantages:

[0030] The bottom guard plate provided by the embodiment of the present disclosure includes a fuel tank guard plate, which is installed on the chassis of the vehicle and is located at the bottom of the fuel tank; the fuel tank guard plate includes a front end close to the head of the vehicle and a rear end close to the rear of the vehicle; along the direction from the front end to the rear end, the fuel tank guard plate extends obliquely in a direction away from the fuel tank. When the airflow approaches the fuel tank guard plate, the at least partially inclined fuel tank guard plate can slowly guide the airflow to avoid the airflow vertically hitting the fuel tank guard plate to form a high-pressure area, thereby reducing the size of the positive pressure area of ​​the fuel tank guard plate and effectively reducing the wind resistance coefficient. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] 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.

[0032] 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.

[0033] Figure 1 It is a structural schematic diagram of the bottom guard plate according to an embodiment of the present disclosure;

[0034] Figure 2 A schematic diagram of a cross-sectional structure of the bottom guard plate in the embodiment of the present disclosure along the direction from the front end to the rear end;

[0035] Figure 3 Another structural schematic diagram of the bottom guard plate described in the embodiment of the present disclosure.

[0036] Figure numerals: 1. connecting plate; 11. first flange; 12. second mounting groove; 13. extension plate; 131. third reinforcing rib; 132. plug-in portion; 2. fuel tank guard plate; 21. second flange; 22. side plate; 23. top plate; 231. first mounting groove; 24. first reinforcing rib; 25. second reinforcing rib; 26. first avoidance portion; 261. first overlapping edge; 27. water leakage hole; 3. exhaust pipe guard plate; 31. second avoidance portion; 32. third avoidance portion; 321. second overlapping edge; 4. battery side guard plate. DETAILED DESCRIPTION

[0037] 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.

[0038] 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.

[0039] Combination Figure 1 , Figure 2 and Figure 3 As shown, the bottom guard plate provided by the embodiment of the present disclosure includes a fuel tank guard plate 2, which is installed on the chassis of the vehicle and is located at the bottom of the fuel tank; the fuel tank guard plate 2 includes a front end close to the head of the vehicle and a rear end close to the rear of the vehicle; along the direction from the front end to the rear end, the fuel tank guard plate 2 extends obliquely away from the fuel tank, that is, along the front and rear direction of the vehicle, at least part of the fuel tank guard plate 2 is inclined away from the fuel tank. When the airflow approaches the fuel tank guard plate 2, the at least partially inclined fuel tank guard plate 2 can slowly guide the airflow to avoid the airflow vertically hitting the fuel tank guard plate 2 to form a high-pressure area, thereby reducing the size of the positive pressure area of ​​the fuel tank guard plate 2 and effectively reducing the wind resistance coefficient.

[0040] Among them, the drag coefficient is an important coefficient for calculating the air resistance of a car. It is a mathematical parameter determined by wind tunnel experiments and gliding experiments, which can be used to calculate the air resistance of a car when it is driving. The size of the drag coefficient depends on the shape of the car. The larger the drag coefficient, the greater the air resistance.

[0041] In some specific embodiments, a connecting plate 1 is provided at the front end of the fuel tank guard plate 2, and both the connecting plate 1 and the fuel tank guard plate 2 extend along the front-to-back direction X of the vehicle; along the front-to-back direction X of the vehicle, a first connecting portion is formed at the rear end of the connecting plate 1, and a second connecting portion is formed at the front end of the fuel tank guard plate 2, and the first connecting portion is connected to the second connecting portion; along the height direction Z of the vehicle, the height of the area of ​​the connecting plate 1 close to the first connecting portion is lower than the height of the area of ​​the fuel tank guard plate 2 close to the second connecting portion, and the end of the connecting plate 1 away from the first connecting portion is higher than the height of the area of ​​the fuel tank guard plate 2 close to the second connecting portion, so that the first connecting portion and the second connecting portion form a step shape, which can increase the strength of the fuel tank guard plate 2 on the one hand, and on the other hand, the step shape can divert part of the airflow and reduce the airflow directly blowing on the fuel tank guard plate 2, which can optimize the aerodynamic resistance of the whole vehicle during road driving and play a role in improving power economy.

[0042] In some specific embodiments, the angle α between the fuel tank guard plate 2 and the horizontal direction satisfies: 3°≤α≤17°. In the case of unchanged fuel tank height, when the angle α between the fuel tank guard plate 2 and the horizontal direction is <3°, if the fuel tank needs to be completely shielded in the X direction of the vehicle, a longer fuel tank bottom guard plate is required, and the fuel tank bottom guard plate will occupy a longer distance in the X direction of the vehicle; when the angle α between the fuel tank guard plate 2 and the horizontal direction is >17°, if the fuel tank needs to be completely shielded in the X direction of the vehicle, the distance between the fuel tank bottom guard plate and the ground is too close. Therefore, in this embodiment, 3°≤α≤17°. This angle range can just allow the fuel tank guard plate 2 to cover the entire fuel tank. Using the principle of the Coanda effect, the fuel tank guard plate 2 slowly guides the airflow to prevent the airflow from hitting the fuel tank guard plate 2 to form a high-pressure area, and at the same time prevent the airflow from separating and failing in the fuel tank guard plate 2 area. In addition, by adjusting the angle α between the fuel tank guard plate 2 and the horizontal direction to ≥3°, the fuel tank guard plate 2 can block the rear suspension lower arm to avoid directly impacting the turbulent area formed after the rear suspension arm of the subframe, thereby effectively optimizing the aerodynamic resistance of the entire vehicle during road driving and playing a role in improving power economy.

[0043] In addition, if the angle α between the fuel tank guard 2 and the horizontal direction is less than 3°, the airflow may not completely bypass the rear suspension arm under the guidance of the fuel tank guard 2, thus forming a turbulent area after impacting the rear suspension arm of the subframe. If the angle α between the fuel tank guard 2 and the horizontal direction is greater than 17°, the windward surface of the fuel tank guard 2 will increase, which is not conducive to reducing the wind resistance coefficient.

[0044] In some specific embodiments, a first flange 11 is provided at the front end of the connecting plate 1, and the first flange 11 extends from the front end of the connecting plate 1 toward the direction close to the vehicle chassis. A smooth transition is provided between the first flange 11 and the connecting plate 1, which can guide the airflow from the first flange 11 to the connecting plate 1, reduce the airflow entering the area between the fuel tank guard plate 2 and the fuel tank, reduce the possibility of turbulence formation, and reduce the drag coefficient.

[0045] In some specific embodiments, a second flange 21 is provided at the rear end of the fuel tank guard plate 2, and the second flange 21 extends from the rear end of the fuel tank guard plate 2 toward the direction close to the vehicle chassis. A smooth transition is formed between the second flange 21 and the fuel tank guard plate 2 to prevent airflow from entering the area between the fuel tank guard plate 2 and the fuel tank, reduce the possibility of turbulence formation, and reduce the drag coefficient.

[0046] In some specific embodiments, along the height direction Z of the vehicle, the front end of the connecting plate 1 is flush with the bottom surface of the battery pack. The high-speed airflow enters the chassis area through the front lip area of ​​the car. The front area of ​​the car's fuel tank guard plate 2 is the lower surface of the battery pack. The surface is relatively flat, and the airflow can pass smoothly without obstruction. Then the airflow passes through the connecting plate 1 located at the front end of the fuel tank guard plate 2. The front end is flush with the bottom surface of the battery pack, which allows the airflow to pass smoothly without obstruction. Then the airflow is guided by the fuel tank guard plate 2 to flow backward. The fuel tank guard plate 2 can slowly guide the airflow to avoid the airflow vertically hitting the fuel tank guard plate 2 to form a high-pressure area, reducing the size of the positive pressure area of ​​the fuel tank guard plate 2, and can effectively reduce the wind resistance coefficient.

[0047] In some specific embodiments, along the height direction Z of the vehicle, the distance L from the rear end of the fuel tank guard plate 2 to the plane where the bottom surface of the battery pack is located satisfies: L ≥ 30 mm. The fuel tank guard plate 2 can shield the lower arm to prevent the airflow from directly impacting the turbulent area formed after the rear suspension arm of the subframe, thereby effectively optimizing the aerodynamic resistance of the vehicle during road driving and improving the power economy.

[0048] In some specific embodiments, a raised portion that rises toward the vehicle chassis is formed near the rear end of the fuel tank guard 2 to reduce the distance between the fuel tank guard 2 and the vehicle chassis. The raised portion is provided with a plurality of first mounting grooves 231, which can reduce the distance between the bottom end of the first mounting groove 231 and the vehicle chassis, thereby improving the stability of the connection between the fuel tank guard 2 and the vehicle chassis. The first mounting groove 231 is conical, and a first mounting hole is provided at the bottom end of the first mounting groove 231. The conical first mounting groove 231 can form a guiding function to facilitate the installation of the fastener. When the fastener is installed, the head of the fastener can be located in the first mounting groove 231 to prevent the airflow from impacting the fastener, thereby reducing the possibility of turbulence and reducing the wind resistance coefficient.

[0049] In some specific embodiments, the raised portion includes a side plate 22 and a top plate 23 connected to each other, and the angle between the side plate 22 and the top plate 23 is an obtuse angle, which is convenient for the derivation of airflow and can reduce the wind resistance coefficient. The first mounting groove 231 is provided on the top plate 23, so that the distance between the first mounting groove 231 and the vehicle chassis is reduced, thereby improving the stability of the connection between the fuel tank guard plate 2 and the vehicle chassis.

[0050] The second flange 21 is connected to the top plate 23 to prevent airflow from entering the area between the fuel tank guard plate 2 and the fuel tank, thereby reducing the possibility of turbulence and lowering the wind resistance coefficient.

[0051] In some specific embodiments, the connecting plate 1 is provided with a plurality of second mounting grooves 12, so that the distance between the bottom end of the second mounting groove 12 and the vehicle chassis can be reduced, thereby improving the stability of the connection between the connecting plate 1 and the vehicle chassis. The second mounting groove 12 is conical, and a second mounting hole is provided at the bottom end of the second mounting groove 12. The conical second mounting groove 12 can form a guiding function, which is convenient for the installation of the fastener. When the fastener is installed, the head of the fastener can be located in the second mounting groove 12, so as to avoid the airflow from impacting the fastener, thereby reducing the possibility of turbulence and reducing the wind resistance coefficient.

[0052] In some specific embodiments, the fuel tank guard plate 2 is provided with a plurality of first reinforcing ribs 24. The strength of the fuel tank guard plate 2 can be improved. The first reinforcing ribs 24 extend in the direction from the front end to the rear end, which is conducive to guiding the airflow, thereby facilitating reducing the wind resistance coefficient of the whole vehicle. The plurality of first reinforcing ribs 24 are arranged at intervals in the direction perpendicular to the front end to the rear end, that is, the plurality of first reinforcing ribs 24 are arranged at intervals in the width direction of the vehicle, which is conducive to guiding the airflow. Preferably, the plurality of first reinforcing ribs 24 are evenly spaced in the width direction of the vehicle.

[0053] In some specific embodiments, the fuel tank guard plate 2 is provided with a plurality of water leakage holes 27, through which the accumulated water in the vehicle chassis area covered by the fuel tank guard plate 2 can be promptly discharged when the vehicle is wading, thereby preventing the fuel tank guard plate 2 from being damaged or deformed.

[0054] In some specific embodiments, the surface of the fuel tank guard 2 facing the vehicle chassis is provided with a plurality of second reinforcing ribs 25. Optionally, the surface of the connecting plate 1 and / or the fuel tank guard 2 facing the vehicle chassis is provided with a plurality of second reinforcing ribs 25. The second reinforcing ribs 25 extend in a direction perpendicular to the front end to the rear end, that is, the second reinforcing ribs 25 extend in the width direction of the vehicle, which can improve the strength of the fuel tank guard 2. The second reinforcing ribs 25 are arranged on the surface facing the vehicle chassis instead of on the surface away from the vehicle chassis, so that the fuel tank guard 2 does not affect the flow of airflow while increasing its strength. When the second reinforcing ribs 25 are added to the surface of the fuel tank guard 2 away from the vehicle chassis, the airflow will impact the second reinforcing ribs 25 to form a high-pressure area when passing through, thereby increasing the wind resistance coefficient.

[0055] In some specific embodiments, along the width direction Y of the vehicle, that is, along the direction perpendicular to the front end to the rear end, one end of the fuel tank guard plate 2 is connected to the exhaust pipe guard plate 3; the two ends of the fuel tank guard plate 2 and the exhaust pipe guard plate 3 that are far away from each other are respectively provided with a first avoidance portion 26 and a second avoidance portion 31 for forming a rear wheel cover avoidance space; the first avoidance portion 26 and the second avoidance portion 31 are respectively arranged on both sides opposite to the width of the vehicle. The first avoidance portion 26 is formed with a first overlapping edge 261, and the second avoidance portion 31 is formed with a second overlapping edge 311; the first overlapping edge 261 and the second overlapping edge 311 are respectively connected to the rear wheel cover, which can improve the stability of the connection. The connection portion of the fuel tank guard plate 2 and the exhaust pipe guard plate 3 is formed with a third avoidance portion 32 for forming an exhaust pipe avoidance space, which facilitates the connection of the fuel tank guard plate 2 and the exhaust pipe guard plate 3 with the vehicle chassis.

[0056] In some specific embodiments, one side of the front end of the connecting plate 2 extends forward to form an extension plate 13, and the extension plate 13 is formed with a plug-in portion 132, and the plug-in portion 132 is used to plug and match with the battery side guard plate 4. After the extension plate 13 is plugged into the battery side guard plate 4 and connected to the vehicle chassis, the stability of the connection can be improved.

[0057] The extension plate 13 is arranged on the connecting plate 1, so that the connecting plate 1 is connected to the battery side guard plate 4 and then connected to the vehicle chassis, which can improve the stability of the connection.

[0058] In some specific embodiments, the extension plate 13 is provided with a plurality of third reinforcing ribs 131, which can improve the strength of the extension plate 13. The third reinforcing ribs 131 are arranged along the direction from the front end to the rear end, and the plurality of third reinforcing ribs 131 are arranged at intervals perpendicular to the direction from the front end to the rear end. This is beneficial to guiding the airflow, thereby facilitating the reduction of the wind resistance coefficient of the vehicle. The plurality of third reinforcing ribs 131 are arranged at intervals along the width direction of the vehicle, which is beneficial to guiding the airflow. Preferably, the plurality of first reinforcing ribs 24 are evenly spaced along the width direction of the vehicle.

[0059] The vehicle chassis provided by the embodiment of the present disclosure includes the bottom guard plate provided by the embodiment of the present disclosure. The vehicle provided by the embodiment of the present disclosure includes the vehicle chassis provided by the embodiment of the present disclosure. Since the vehicle chassis provided by the embodiment of the present disclosure includes the bottom guard plate provided by the embodiment of the present disclosure. The vehicle provided by the embodiment of the present disclosure includes the vehicle chassis provided by the embodiment of the present disclosure.

[0060] 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 "comprising" 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 "comprising a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0061] The above are only specific embodiments 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 can 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 these embodiments herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A bottom guard plate, characterized in that: include: A fuel tank guard is installed on the vehicle chassis and is located at the bottom of the fuel tank; The fuel tank guard plate includes a front end close to the head of the vehicle and a rear end close to the rear of the vehicle; Along the direction from the front end to the rear end, the fuel tank guard plate extends obliquely in a direction away from the fuel tank.

2. The bottom guard plate according to claim 1, characterized in that: A connecting plate is provided at the front end of the fuel tank guard plate, and both the connecting plate and the fuel tank guard plate extend along the front-rear direction (X) of the vehicle; Along the front-to-rear direction (X) of the vehicle, a first connection portion is formed at the rear end of the connection plate, a second connection portion is formed at the front end of the fuel tank guard plate, and the first connection portion is connected to the second connection portion; Along the height direction (Z) of the vehicle, the height of the area of ​​the connecting plate close to the first connecting part is lower than the height of the area of ​​the fuel tank guard plate close to the second connecting part, and the end of the connecting plate away from the first connecting part is higher than the height of the area of ​​the fuel tank guard plate close to the second connecting part.

3. The bottom guard plate according to claim 1, characterized in that: The angle α between the oil tank guard plate and the horizontal direction satisfies: 3°≤α≤17°.

4. The bottom guard plate according to claim 2, characterized in that: A first flange is provided at the front end of the connecting plate, and the first flange extends from the front end of the connecting plate toward the vehicle chassis, and a smooth transition is formed between the first flange and the connecting plate; And / or, a second flange is provided at the rear end of the fuel tank guard plate, and the second flange extends from the rear end of the fuel tank guard plate toward the vehicle chassis, and a smooth transition is formed between the second flange and the fuel tank guard plate.

5. The bottom guard plate according to claim 2, characterized in that: Along the height direction (Z) of the vehicle, the front end of the connecting plate is flush with the bottom surface of the battery pack.

6. The bottom guard plate according to claim 5, characterized in that: Along the height direction (Z) of the vehicle, the distance L from the rear end of the fuel tank guard plate to the plane where the bottom surface of the battery pack is located satisfies: L≥30mm.

7. The bottom guard plate according to claim 1, characterized in that: A raised portion raised toward the vehicle chassis is formed in the area of ​​the fuel tank guard plate near the rear end, and the raised portion is provided with a plurality of first mounting grooves, the first mounting grooves are conical, and a first mounting hole is provided at the bottom end of the first mounting groove.

8. The bottom guard plate according to claim 7, characterized in that: The raised portion includes a side plate and a top plate connected to each other, and the angle between the side plate and the top plate is an obtuse angle.

9. The bottom guard plate according to claim 2, characterized in that: The connecting plate is provided with a plurality of second mounting grooves, the second mounting grooves are conical, and the bottom ends of the second mounting grooves are provided with second mounting holes; And / or, the fuel tank guard plate is provided with a plurality of first reinforcing ribs, the first reinforcing ribs extend in a direction from the front end to the rear end, and the plurality of first reinforcing ribs are arranged at intervals perpendicular to the direction from the front end to the rear end; And / or, a surface of the fuel tank guard plate facing the vehicle chassis is provided with a plurality of second reinforcing ribs, and the second reinforcing ribs extend in a direction perpendicular to the front end to the rear end.

10. The bottom guard plate according to claim 1, characterized in that: Along the width direction (Y) of the vehicle, one end of the fuel tank guard plate is connected to the exhaust pipe guard plate; The two ends of the fuel tank guard plate and the exhaust pipe guard plate that are away from each other are respectively provided with a first avoidance portion and a second avoidance portion for forming a rear wheel cover avoidance space; The first avoidance portion is formed with a first overlapping edge, and the second avoidance portion is formed with a second overlapping edge; A third escape portion for forming an escape space for the exhaust pipe is formed at a connection portion between the oil tank guard plate and the exhaust pipe guard plate.

11. The bottom guard plate according to claim 2, characterized in that: One side of the front end of the connecting plate extends forward to form an extension plate, and the extension plate forms a plug-in portion, and the plug-in portion is used for plugging and matching with the battery side guard plate.

12. The bottom guard plate according to claim 11, characterized in that: The extension plate is provided with a plurality of third reinforcing ribs, the third reinforcing ribs are along a direction from the front end to the rear end, and the plurality of third reinforcing ribs are arranged at intervals along a direction perpendicular to the direction from the front end to the rear end.

13. A vehicle chassis, characterized in that: Comprising the bottom guard plate described in any one of claims 1 to 12.

14. A vehicle, characterized in that: Comprising the vehicle chassis as claimed in claim 13.

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