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

Abstract

The utility model discloses a bottom guard plate structure with drainage 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 drainage plate, the drainage plate 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 drainage plate extends along the edges of the notches, and drainage grooves are formed in the drainage plate. According to the utility model, by designing the drainage plate with a drainage function on the bottom guard plate, vortex sound coupling generation conditions are changed, so that the problem of low-frequency noise of the pure electric vehicle under a high-speed working condition is thoroughly 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 drainage and noise reduction functions 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 drainage and noise reduction. By designing a drainage plate with drainage function on the underbody guard plate, the conditions for vortex-acoustic coupling are changed, thereby completely solving the low-frequency noise problem of pure electric vehicles under high-speed working conditions from the excitation source.

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

[0005] Furthermore, the guide plate 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 guide plate 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 drainage plate includes a bottom plate, a first side plate, and a second side plate, the bottom plate is installed on the bottom guard plate, the first side plate is vertically arranged on one side of the bottom plate, the second side plate is vertically arranged on the other side of the bottom plate, and the drainage groove is formed between the first side plate, the second side plate, and the bottom plate.

[0007] Furthermore, the drainage plate includes a bottom plate, a first side plate, a second side plate, and a partition plate, the bottom plate is installed on the bottom guard plate, the first side plate is vertically arranged on one side of the bottom plate, the second side plate is vertically arranged on the other side of the bottom plate, the partition plate is arranged between the first side plate and the second side plate, and the partition plate is vertically installed on the bottom plate, and a plurality of drainage grooves are formed between the first side plate and the second side plate through the partition plate.

[0008] Furthermore, the lengths of the plurality of drainage grooves decrease successively from the outside to the inside.

[0009] Furthermore, the notch is in a C-shaped structure with its opening facing outward.

[0010] Further, the first mounting hole is arranged on the drainage groove, the mounting member is a bolt, and the first mounting hole and the second mounting hole are bolt holes matched with the bolt.

[0011] Further, the notch includes a first notch and a second notch, the guide plate includes a first guide plate and a second guide plate, and the first guide plate and the second guide plate are respectively extended along the edges of the first notch and the second notch.

[0012] Further, the drainage groove includes a first drainage groove and a second drainage groove, and the first drainage groove and the second drainage groove are respectively arranged on the first drainage plate and the second drainage plate.

[0013] The utility model also provides a vehicle, comprising the bottom guard plate structure with drainage 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 drainage and 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 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 drainage plate with drainage function 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, applicable to research models and mass-produced models, and has a wide range of adaptation. Among them, the drainage plate can be formed using materials such as PP or PP+PET, 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 drainage and noise reduction of the utility model;

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

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

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

[0022] Among them: 10-bottom guard plate; 11-notch; 11a-first notch; 11b-second notch; 20-drainage plate; 20a-first drain plate; 20b-second drain plate; 21-drainage groove; 21a-first drain groove; 21b-second drain groove; 22-bottom plate; 23-first side plate; 24-second side plate; 25-partition; 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 1-2Due 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 3 In order to solve the problem of high-speed low-frequency noise in pure electric vehicles, the utility model provides a bottom guard plate structure with drainage and 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 drainage plate 20, the drainage plate 20 is detachably installed at the bottom of the bottom guard plate 10, a notch 11 is provided at both sides of the rear end of the bottom guard plate 10, the drainage plate 20 is extended along the edge of the notch 11, and a drainage groove 21 is provided on the drainage plate 20. 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, 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 sets a guide plate 20 at the notch 11 of the bottom guard plate 10, and sets a guide groove 21 on the guide plate 20. When the stable airflow 80 flows through the edge of the bottom guard plate 10, the guide groove 21 can guide the airflow 80 to the center of the bottom guard plate 10, so that the airflow 80 cannot stably form a shedding vortex at the edge of the notch 11, and the self-excited oscillation phenomenon cannot be formed. Therefore, the problem of low-frequency noise can be completely solved.

[0027] Furthermore, the guide plate 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 guide plate 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 guide plate 20 and the bottom guard plate 10 and prevent the guide plate 20 from falling off during use. Specifically, the first mounting hole is arranged on the guide groove 21, and 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. In addition, the guide plate 20 can also be riveted to the bottom guard plate 10.

[0028] Furthermore, the number of drainage grooves 21 in the utility model 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. If the airflow 80 is large, multiple drainage grooves 21 can be set for drainage. If the airflow 80 is small, only one drainage groove 21 can be set for drainage. In the present embodiment, a total of two drainage grooves 21 are set.

[0029] Specifically, if the airflow 80 is small and only one guide groove 21 is required, the guide plate 20 includes a bottom plate 22, a first side plate 23, and a second side plate 24. The bottom plate 22 is mounted on the bottom guard plate 10, the first side plate 23 is vertically arranged on one side of the bottom plate 22, the second side plate 24 is vertically arranged on the other side of the bottom plate 22, and the guide groove 21 is formed between the first side plate 23, the second side plate 24, and the bottom plate 22. When the airflow 80 passes through the edge of the bottom of the bottom guard plate 10, it can pass through the guide groove 21, and the guide groove 21 can guide the airflow 80 to the center of the bottom guard plate 10, so that the airflow 80 cannot stably form a shedding vortex at the edge of the notch 11.

[0030] Furthermore, if the airflow 80 is large and multiple drainage grooves 21 need to be set, the drainage plate 20 includes a bottom plate 22, a first side plate 23, a second side plate 24, and a partition 25. The bottom plate 22 is installed on the bottom guard plate 10, the first side plate 23 is vertically arranged on one side of the bottom plate 22, and the second side plate 24 is vertically arranged on the other side of the bottom plate 22. The partition 25 is arranged between the first side plate 23 and the second side plate 24. The partition 25 is vertically installed on the bottom plate 22, and multiple drainage grooves 21 are formed between the first side plate 23 and the second side plate 24 through the partition 25. The lengths of the multiple drainage grooves 21 decrease from the outside to the inside, and the front end connection lines of the multiple drainage grooves 21 remain flush, and the rear end connection lines are arranged inwardly and forwardly from the edge of the notch 11. This arrangement can facilitate the guidance of the airflow to the center of the bottom guard plate 10. When the airflow 80 passes through the edge of the bottom of the bottom guard plate 10 , it will pass through multiple drainage grooves 21 , which can guide the airflow 80 to the center of the bottom guard plate 10 , so that the airflow 80 cannot stably form a shedding vortex at the edge of the notch 11 .

[0031] 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 guide plate 20 includes a first guide plate 20a and a second guide plate 20b, and the first guide plate 20a and the second guide plate 20b are respectively extended along the edges of the first notch 11a and the second notch 11b. The drainage groove 21 includes a first drainage groove 21a and a second drainage groove 21b, and the first drainage groove 21a and the second drainage groove 21b are respectively arranged on the first drainage plate 20a and the second drainage plate 20b. In the utility model, the notch 11 is specifically a C-shaped structure with the notch 11 opening outward, so the guide plate 20 in the utility model is also a C-shaped structure with the notch 11 opening outward as a whole, and the guide plate 20 is arranged in a shape corresponding to the edge of the notch 11, which can facilitate drainage.

[0032] After the above description and Figure 6 It can be known that the utility model provides a bottom guard plate structure with drainage and 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 the 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 drainage plate 20 with drainage function 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 drainage plate 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.

[0033] The utility model also provides a vehicle, including the bottom guard plate structure with drainage 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.

[0034] 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 drainage and noise reduction, characterized in that: The invention comprises a bottom guard plate (10) and a guide plate (20), wherein the guide plate (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 guide plate (20) is extended along the edge of the notch (11), and a guide groove (21) is arranged on the guide plate (20).

2. The bottom guard plate structure with drainage and noise reduction according to claim 1 is characterized in that: The guide plate (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 guide plate (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 drainage and noise reduction according to claim 1 is characterized in that: The guide plate (20) comprises a bottom plate (22), a first side plate (23), and a second side plate (24); the bottom plate (22) is mounted on the bottom guard plate (10); the first side plate (23) is vertically arranged on one side of the bottom plate (22); the second side plate (24) is vertically arranged on the other side of the bottom plate (22); and the guide groove (21) is formed between the first side plate (23), the second side plate (24), and the bottom plate (22).

4. The bottom guard plate structure with drainage and noise reduction according to claim 1 is characterized in that: The guide plate (20) comprises a bottom plate (22), a first side plate (23), a second side plate (24), and a partition plate (25); the bottom plate (22) is mounted on the bottom guard plate (10); the first side plate (23) is vertically arranged on one side of the bottom plate (22); the second side plate (24) is vertically arranged on the other side of the bottom plate (22); the partition plate (25) is arranged between the first side plate (23) and the second side plate (24); and the partition plate (25) is vertically mounted on the bottom plate (22); a plurality of the guide grooves (21) are formed between the first side plate (23) and the second side plate (24) through the partition plate (25).

5. The bottom guard plate structure with drainage and noise reduction according to claim 4 is characterized in that: The lengths of the plurality of drainage grooves (21) decrease gradually from the outside to the inside.

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

7. The bottom guard plate structure with drainage and noise reduction according to claim 2 is characterized in that: The first mounting hole is arranged on the drainage groove (21), the mounting member (30) is a bolt, and the first mounting hole and the second mounting hole are bolt holes that cooperate with the bolt.

8. The bottom guard plate structure with drainage and noise reduction according to claim 6 is characterized in that: The notch (11) comprises a first notch (11a) and a second notch (11b); the guide plate (20) comprises a first guide plate (20a) and a second guide plate (20b); the first guide plate (20a) and the second guide plate (20b) are respectively extended along the edges of the first notch (11a) and the second notch (11b).

9. The bottom guard plate structure with drainage and noise reduction according to claim 8, characterized in that: The drainage groove (21) comprises a first drainage groove (21a) and a second drainage groove (21b), and the first drainage groove (21a) and the second drainage groove (21b) are respectively arranged on the first drainage plate (20a) and the second drainage plate (20b).

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

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