Bottom guard plate structure with turbulence and noise reduction functions and vehicle

Abstract

The utility model discloses a bottom guard plate structure with turbulent flow and noise reduction functions and a vehicle, and relates to the field of automobile parts. The bottom protection plate structure specifically comprises a bottom protection plate and a spoiler, the spoiler is detachably installed at the bottom of the bottom protection plate, notches are formed in the two sides of the rear end of the bottom protection plate, the spoiler extends along the edges of the notches, and a plurality of spoiler openings are formed in the spoiler. According to the utility model, the spoiler with a spoiler effect is designed on the bottom guard plate, and the vortex sound coupling generation condition is changed, so that the problem of low-frequency noise of the pure electric vehicle under the high-speed working condition is solved from an excitation source.

Description

Technical Field

[0001] The utility model relates to the field of automobile parts, in particular to an underbody guard plate structure with spoiler and noise reduction function and a vehicle. Background Art

[0002] In recent years, pure electric vehicles have achieved vigorous development. Most pure electric vehicles have a high starting point and a high-intelligence development foundation, and they are constantly impacting the high-end automobile market. Customers in the high-end market have higher expectations and stricter requirements for automobile performance, and the low-frequency noise generated by pure electric vehicles under high-speed conditions may exceed 60 decibels, which seriously affects the ride comfort of the vehicle and greatly reduces the driving pleasure of the vehicle. On the other hand, it also reduces the brand power of the OEM and brings huge cost pressure to after-sales maintenance. For this reason, a solution with mature and reliable technology, low cost and controllable weight is urgently needed to solve the low-frequency noise problem under high-speed conditions. At present, there is no technology that can perfectly solve the low-frequency noise problem of pure electric vehicles under high-speed conditions. Utility Model Content

[0003] In view of this, the utility model provides an underbody guard plate structure and a vehicle with spoiler noise reduction, by designing a spoiler with spoiler effect on the underbody guard plate, changing the conditions for vortex-acoustic coupling, thereby solving the low-frequency noise problem of pure electric vehicles under high-speed conditions from the excitation source.

[0004] The utility model provides a bottom guard plate structure with spoiler and noise reduction, comprising a bottom guard plate and a spoiler, wherein the spoiler is detachably mounted on the bottom of the bottom guard plate, notches are arranged at both sides of the rear end of the bottom guard plate, the spoiler is extended along the edge of the notch, and the spoiler is provided with a plurality of spoiler openings.

[0005] Furthermore, the spoiler is provided with a first mounting hole, and the bottom guard plate is provided with a second mounting hole corresponding to the first mounting hole, and the spoiler is detachably mounted on the bottom guard plate through the cooperation of the first mounting hole, the second mounting hole, and the mounting piece.

[0006] Furthermore, the spoiler includes a transverse plate and a vertical plate, the transverse plate is mounted on the bottom guard plate and arranged parallel to the bottom guard plate, the vertical plate is vertically connected to the outer side of the transverse plate, and the spoiler port is arranged on the vertical plate.

[0007] Furthermore, the vertical board includes a vertical board upper portion and a vertical board lower portion, and the height of the vertical board lower portion is greater than the height of the vertical board upper portion.

[0008] Furthermore, the spoiler opening is in a U-shaped structure with an opening facing upward, and a plurality of spoiler openings are distributed at intervals on the upper portion of the vertical plate.

[0009] Furthermore, the spoiler opening is in a U-shaped structure, and a plurality of spoiler openings are distributed at intervals on the upper portion of the vertical plate.

[0010] Furthermore, the notch is in a C-shaped structure with its opening facing outward.

[0011] Further, the first mounting hole is arranged on the transverse plate, the mounting member is a bolt, and the first mounting hole and the second mounting hole are bolt holes matched with the bolt.

[0012] Further, the notch includes a first notch and a second notch, the spoiler includes a first spoiler and a second spoiler, the first spoiler and the second spoiler are respectively extended along the edges of the first notch and the second notch, and the spoiler port includes a first spoiler port and a second spoiler port, the first spoiler port and the second spoiler port are respectively arranged on the first spoiler and the second spoiler.

[0013] The utility model also provides a vehicle, comprising the bottom guard plate structure with spoiler and noise reduction as described above.

[0014] Compared with the existing technology, the utility model has the following beneficial technical effects:

[0015] The utility model provides a bottom guard plate structure and vehicle with spoiler noise reduction. By analyzing the mechanism of low-frequency noise in high-speed working conditions of pure electric vehicles, it is confirmed that the excitation source is the self-excited oscillation phenomenon of vortex-acoustic coupling when the stable incoming flow passes through the cavity formed by the bottom guard plate and the rear bumper. According to this excitation principle, a spoiler with spoiler effect is designed on the bottom guard plate to change the conditions for vortex-acoustic coupling, thereby completely solving the low-frequency noise problem in high-speed working conditions of pure electric vehicles from the excitation source; the utility model is easy to install and can be applied to research models and mass-produced models with a wide range of adaptation. The spoiler can be formed using materials such as PP or PP+PET, and the raw materials are easy to obtain, the processing is simple, and the cost is low. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of the structure of a cavity formed by the underbody guard and the rear bumper of a pure electric vehicle;

[0017] Figure 2 A schematic diagram of the principle of self-excited oscillation of a stable airflow through a cavity;

[0018] Figure 3 It is a schematic diagram of a bottom guard plate structure with spoiler and noise reduction according to the utility model;

[0019] Figure 4 It is a structural schematic diagram of the first spoiler in the utility model;

[0020] Figure 5It is a structural schematic diagram of the second spoiler in the utility model;

[0021] Figure 6 The effect diagram of the bottom guard plate structure provided for this practical model on the spoiler noise reduction of pure electric vehicles.

[0022] Among them: 10-bottom guard plate; 11-notch; 11a-first notch; 11b-second notch; 20-spoiler; 20a-first spoiler; 20b-second spoiler; 21-spoiler port; 21a-first spoiler port; 21b-second spoiler port; 22-horizontal plate; 23-vertical plate; 231-upper part of vertical plate; 232-lower part of vertical plate; 30-mounting part; 40-rear bumper; 50-body; 60-cavity; 70-pressure relief valve; 80-airflow; 90-sound wave. DETAILED DESCRIPTION

[0023] The following is a further detailed description of the specific implementation of the present invention in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0024] In the description of the present invention, it should be noted that the orientation or position relationship indicated in the description is based on the orientation or position relationship shown in the accompanying drawings, and is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the referred parts or elements must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0025] See also Figure 1-2 Due to the envelope of the existing suspension movement, the rear part of the chassis of the existing pure electric vehicle forms an obvious cavity 60 by the bottom guard plate 10, the rear bumper 40 and the body 50. Since the chassis of the pure electric vehicle is flat and has a strong combing effect, the stable incoming flow of the flat chassis combing flow passes through the cavity 60 formed by the bottom guard plate 10 and the rear bumper 40, and the vortex-acoustic coupling self-excited oscillation phenomenon occurs. The self-excited oscillation excitation is coupled with the longitudinal first-order mode of the interior space of the vehicle through the pressure relief valve 70, which will form a very obvious low-frequency noise in the vehicle. Self-excited oscillation means that when the airflow 80 passes through the leading edge of the cavity 60, the shedding vortex continuously moves toward the trailing edge of the cavity 60, and breaks after colliding with the trailing edge and propagates sound waves to the surroundings at the local sound speed. When the propagated sound wave 90 forms a certain phase relationship with the shedding vortex at the leading edge of the cavity 60, it continuously stimulates the shedding vortex of the airflow 80 at the leading edge of the cavity 60, forming a vortex-acoustic coupling self-excited oscillation phenomenon with a feedback enhancement mechanism.

[0026] See also Figure 3In order to solve the problem of high-speed low-frequency noise of pure electric vehicles, the utility model provides a bottom guard plate structure with spoiler noise reduction, which can destroy the formation conditions of self-excited oscillation in principle, thereby solving the problem of low-frequency noise. The bottom guard plate structure specifically includes: a bottom guard plate 10 and a spoiler 20, the spoiler 20 is detachably installed at the bottom of the bottom guard plate 10, and notches 11 are provided at the positions on both sides of the rear end of the bottom guard plate 10. The spoiler 20 is extended along the edge of the notch 11, and the spoiler 20 is provided with a plurality of spoiler ports 21. Among them, the rear end of the bottom guard plate 10 refers to the end of the bottom guard plate 10 close to the rear bumper 40, and the notch 11 is provided to provide an installation space for the suspension device, and a cavity 60 is formed between the notch 11 and the rear bumper 40 and the vehicle body 50. The utility model arranges a spoiler 20 at the notch 11 of the bottom guard plate 10, and arranges a plurality of spoiler ports 21 on the spoiler 20. When a stable airflow 80 flows through the edge of the bottom guard plate 10, the spoiler ports 21 can disrupt the stable airflow 80 to form turbulent flow, so that the airflow 80 cannot stably form a shedding vortex at the edge of the notch 11, and self-excited oscillation cannot be formed. Therefore, the flow resistance can be reduced and the problem of low-frequency noise can be solved.

[0027] Furthermore, the spoiler 20 is provided with a first mounting hole, and the bottom guard plate 10 is provided with a second mounting hole corresponding to the first mounting hole. The spoiler 20 is detachably mounted on the bottom guard plate 10 through the cooperation of the first mounting hole, the second mounting hole, and the mounting member 30, so as to strengthen the stability between the spoiler 20 and the bottom guard plate 10 and prevent the spoiler 20 from falling off during use. Specifically, the mounting member 30 can be a bolt, a screw or other mounting device. When the mounting member 30 is a bolt, the first mounting hole and the second mounting hole are bolt holes that cooperate with the bolt. It should be noted that the number of mounting members 30 used is not limited, and can be determined according to the specific conditions of the vehicle body and the size of the airflow 80 at the bottom of the bottom guard plate 10. Accordingly, the number of the first mounting holes and the second mounting holes can be determined according to the number of mounting members 30.

[0028] Further, the spoiler 20 includes a transverse plate 22 and a vertical plate 23. The transverse plate 22 is mounted on the bottom guard plate 10 and arranged parallel to the bottom guard plate 10, so as to guide the airflow 80 to flow along the transverse plate 22. The vertical plate 23 is vertically connected to the outer side of the transverse plate 22. The spoiler port 21 is arranged on the vertical plate 23. The airflow 80 flowing on the transverse plate 22 will flow out from the spoiler port 21. The stable airflow 80 forms turbulence through the action of the spoiler port 21. The vertical plate 23 includes a vertical plate upper portion 231 and a vertical plate lower portion 232. The height of the vertical plate lower portion 232 is less than the height of the vertical plate upper portion 231. The vertical plate lower portion 232 is used for drainage. Most of the airflow flows out through the spoiler port 21 of the vertical plate upper portion 231 to form turbulence. The shape and size of the spoiler port 21 and the arrangement position on the vertical plate upper portion 231 are not limited, and can be determined according to the specific conditions of the vehicle body and the size of the airflow 80 at the bottom of the bottom guard plate 10. For example, the spoiler 21 is in a U-shaped structure with an opening upward, and a plurality of spoiler ports 21 are spaced apart on the upper part 231 of the vertical plate. Alternatively, the spoiler 21 is in a U-shaped structure, and a plurality of spoiler ports 21 are spaced apart on the upper part 231 of the vertical plate. In the present embodiment, the spoiler 21 is in a U-shaped structure with an opening upward, and is spaced apart. When the airflow 80 passes through the edge of the bottom of the bottom guard plate 10, it will pass through a plurality of spoiler ports 21, and the plurality of spoiler ports 21 can disturb the airflow 80 to form turbulence, so that the airflow 80 cannot stably form a shedding vortex at the edge of the notch 11.

[0029] Please also read Figure 4-5 , both sides of the rear end of the bottom guard plate 10 are provided with notches 11, specifically including a first notch 11a and a second notch 11b, and correspondingly, the spoiler 20 includes a first spoiler 20a and a second spoiler 20b, and the first spoiler 20a and the second spoiler 20b are fixed to the edges of the first notch 11a and the second notch 11b respectively. The spoiler port 21 includes a first spoiler port 21a and a second spoiler port 21b, and the first spoiler port 21a and the second spoiler port 21b are respectively arranged on the first spoiler 20a and the second spoiler 20b. In the utility model, the notch 11 is specifically a C-shaped structure with the notch 11 opening outward, so the spoiler 20 in the utility model is also a C-shaped structure with the notch 11 opening outward, and the spoiler 20 is arranged in a shape corresponding to the edge of the notch 11, so that the airflow 80 cannot stably form a shedding vortex at the edge of the notch 11.

[0030] After the above description and Figure 6It can be known that the utility model provides a bottom guard plate structure with spoiler noise reduction. By analyzing the mechanism of low-frequency noise problems in high-speed working conditions of pure electric vehicles, it is confirmed that the excitation source is a self-excited oscillation phenomenon of vortex-acoustic coupling when the stable incoming flow passes through the cavity 60 formed by the bottom guard plate 10 and the rear bumper 40. According to this excitation principle, a spoiler 20 with a spoiler effect is designed on the bottom guard plate 10 to change the conditions for vortex-acoustic coupling, thereby completely solving the low-frequency noise problem of pure electric vehicles under high-speed working conditions from the excitation source; the utility model is easy to install, applicable to research models and mass-produced models, and has a wide range of adaptation. The spoiler 20 can be formed using materials such as PP or PP+PET, and the raw materials are easy to obtain, the processing is simple, and the cost is low.

[0031] The utility model also provides a vehicle, including the bottom guard plate structure with spoiler and noise reduction as described above. For other technical features of the vehicle, please refer to the prior art and will not be described in detail here.

[0032] The above are only preferred embodiments of the present invention, and are not intended to limit the present invention in any form. Although the present invention has been disclosed as a preferred embodiment, it is not intended to limit the present invention. Any technician familiar with the profession can make some changes or modifications to equivalent embodiments of equivalent changes using the technical contents disclosed above without departing from the scope of the technical solution of the present invention. However, any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A bottom guard plate structure with spoiler and noise reduction, characterized in that: The invention comprises a bottom guard plate (10) and a spoiler (20), wherein the spoiler (20) is detachably mounted on the bottom of the bottom guard plate (10), notches (11) are arranged at both sides of the rear end of the bottom guard plate (10), the spoiler (20) is extended along the edge of the notch (11), and the spoiler (20) is provided with a plurality of spoiler openings (21).

2. The bottom guard plate structure with spoiler and noise reduction according to claim 1 is characterized in that: The spoiler (20) is provided with a first mounting hole, and the bottom guard plate (10) is provided with a second mounting hole corresponding to the first mounting hole. The spoiler (20) is detachably mounted on the bottom guard plate (10) through the cooperation of the first mounting hole, the second mounting hole, and the mounting member (30).

3. The bottom guard plate structure with spoiler and noise reduction according to claim 2 is characterized in that: The spoiler (20) comprises a transverse plate (22) and a vertical plate (23); the transverse plate (22) is mounted on the bottom guard plate (10) and arranged in parallel with the bottom guard plate (10); the vertical plate (23) is vertically connected to the outer side of the transverse plate (22); and the spoiler port (21) is arranged on the vertical plate (23).

4. The bottom guard plate structure with spoiler and noise reduction according to claim 3 is characterized in that: The vertical plate (23) comprises a vertical plate upper portion (231) and a vertical plate lower portion (232), and the height of the vertical plate lower portion (232) is smaller than the height of the vertical plate upper portion (231).

5. The bottom guard plate structure with spoiler and noise reduction according to claim 4 is characterized in that: The spoiler opening (21) is in a U-shaped structure with its opening upward, and a plurality of spoiler openings (21) are distributed at intervals on the upper portion (231) of the vertical plate.

6. The bottom guard plate structure with spoiler and noise reduction according to claim 4 is characterized in that: The spoiler opening (21) is in a U-shaped structure, and a plurality of spoiler openings (21) are distributed at intervals on the upper portion (231) of the vertical plate.

7. The bottom guard plate structure with spoiler and noise reduction according to claim 1, characterized in that: The notch (11) is in a C-shaped structure with its opening facing outward.

8. The bottom guard plate structure with spoiler and noise reduction according to claim 3 is characterized in that: The first mounting hole is arranged on the transverse plate (22), the mounting member (30) is a bolt, and the first mounting hole and the second mounting hole are bolt holes matched with the bolt.

9. The bottom guard plate structure with spoiler and noise reduction according to claim 7, characterized in that: The notch (11) comprises a first notch (11a) and a second notch (11b); the spoiler (20) comprises a first spoiler (20a) and a second spoiler (20b); the first spoiler (20a) and the second spoiler (20b) are respectively extended along the edges of the first notch (11a) and the second notch (11b); the spoiler opening (21) comprises a first spoiler opening (21a) and a second spoiler opening (21b); the first spoiler opening (21a) and the second spoiler opening (21b) are respectively arranged on the first spoiler (20a) and the second spoiler (20b).

10. A vehicle, characterized in that: It comprises a bottom guard plate structure with spoiler and noise reduction as described in any one of claims 1 to 9.

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