A vehicle

Abstract

The application discloses an automobile. The automobile provided by the application comprises a cover, a ventilation cover plate and a noise reduction assembly. Specifically, the ventilation cover plate is arranged on the lower side of the cover, and a cavity is formed between the cover and the ventilation cover plate; the noise reduction assembly is arranged in the cavity and is used for plugging the cavity. In the application, the noise reduction assembly is arranged in the cavity between the cover and the ventilation cover plate to plug the cavity. When the cavity under the cover is reduced, the airflow entering the cavity is also reduced. In this way, the vortex in the cavity can be reduced, the energy of the noise source can be reduced, and thus the wind noise can be reduced, so that the influence on the driver and the passenger can be reduced, and the practicality is high.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of automobile performance optimization, and particularly relates to an automobile. BACKGROUND

[0002] With the rapid development of new energy vehicles, the competition in the automobile industry is becoming increasingly fierce, and consumers pay more and more attention to various performances and functions of automobiles. Automobile NVH (Noise, Vibration, Harshness) becomes an important performance reference for customers to select and purchase vehicles. With the development of automobile manufacturing technology, the design of automobile NVH is becoming more and more sophisticated. Near the front windshield of the automobile, especially in the vent cover part, the turbulence intensity is large, and the wind noise generated is relatively strong. This area is close to the front passengers, and the front side window is a weak part of sound insulation, and it is difficult to use measures to enhance sound absorption on the glass. Therefore, the wind noise of the vent cover has a significant impact on the noise inside the passenger compartment, so the design of the shape of the vent cover is very critical.

[0003] In the prior art, such as patent document "air flow guide" (its publication number: "CN201720103799.6"), an air flow guide is disclosed, which is arranged on the hood of a vehicle engine to constitute air flow guidance between the hood and the front windshield on which a wiper is installed. The air flow guide has a main body and a flow guide surface, wherein the main body is fixed on the hood and extends along the width direction of the vehicle; the flow guide surface is formed on the side of the main body close to the head of the vehicle and extends upward from the hood to guide the air flow to the front windshield above the wiper.

[0004] Therefore, in the prior art, in order to improve the wind noise at the vent cover, the air flow is generally guided to the top of the front windshield glass. However, vortexes are still generated in the cavity of the vent cover and the front windshield glass, and the noise of the vortexes is still relatively large. SUMMARY

[0005] In view of the problems in the background art, the purpose of the present application is to provide an automobile to solve the problem in the prior art that, during driving, the air flow is guided to the top of the front windshield glass, but vortexes are still generated in the cavity of the vent cover and the front windshield glass, and the noise of the vortexes is still relatively large.

[0006] To solve the above technical problems, one technical scheme adopted by the present application is to provide an automobile, which comprises a hood, a vent cover and a noise reduction assembly. The vent cover is arranged on the lower side of the hood, and a cavity is formed between the hood and the vent cover. The noise reduction assembly is arranged in the cavity and is used to seal the cavity.

[0007] In some specific embodiments, the noise reduction assembly is connected with the hood.

[0008] In some specific embodiments, the shape of the upper surface of the noise reduction assembly is adapted to the shape of the lower surface of the cover, so that the upper surface of the noise reduction assembly is fitted to the lower surface of the cover, and there is a gap between the lower surface of the noise reduction assembly and the upper surface of the vent cover plate.

[0009] In some specific embodiments, the noise reduction assembly is formed with a receiving cavity, and the surface of the noise reduction assembly is provided with a plurality of noise reduction holes communicating with the receiving cavity.

[0010] In some specific embodiments, a partition is arranged in the receiving cavity, and the partition divides the noise reduction assembly into a first noise reduction part and a second noise reduction part, and the first noise reduction part is closer to the opening of the cavity than the second noise reduction part, wherein the surface of the first noise reduction part is provided with first noise reduction holes communicating with the receiving cavity, and the surface of the second noise reduction part is provided with second noise reduction holes communicating with the receiving cavity, and the aperture of the first noise reduction holes is larger than the aperture of the second noise reduction holes.

[0011] In some specific embodiments, the aperture of the first noise reduction holes ranges from 1mm to 3mm.

[0012] In some specific embodiments, the aperture of the second noise reduction holes is less than 1mm.

[0013] In some specific embodiments, the depth of the receiving cavity corresponding to the first noise reduction part is greater than the depth of the receiving cavity corresponding to the second noise reduction part, and the depth direction of the receiving cavity is the spacing direction of the cover and the vent cover plate.

[0014] In some specific embodiments, the receiving cavity is provided with sound-absorbing material.

[0015] In some specific embodiments, the side of the noise reduction assembly close to the opening of the cavity is inclined to the outside of the cavity in the direction from the cover to the vent cover plate.

[0016] The automobile provided by the present application has the following beneficial effects: Different from the prior art, the automobile provided by the present application comprises a cover, a vent cover plate and a noise reduction assembly. The vent cover plate is arranged on the lower side of the cover, and a cavity is formed between the cover and the vent cover plate. The noise reduction assembly is arranged in the cavity and is used for plugging the cavity. In the automobile provided by the present application, the noise reduction assembly is arranged in the cavity formed by the cover and the vent cover plate to plug the cavity. This kind of arrangement can reduce the airflow of the entering air, so as to reduce the vortex flow in the cavity and reduce the vortex noise, and has strong practicability. BRIEF DESCRIPTION OF DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed to be used in the embodiments description will be briefly introduced. Obviously, the drawings in the following description are some embodiments of the present application, and other drawings can be obtained by those skilled in the art without any creative effort.

[0018] Figure 1 is a structural schematic diagram of an automobile when no noise reduction component is placed between the hood and the vent cover plate;

[0019] Figure 2 is a structural schematic diagram of an embodiment of an automobile provided by the present application;

[0020] Figure 3 is a structural schematic diagram of another embodiment of an automobile provided by the present application.

[0021] BRIEF DESCRIPTION OF DRAWINGS: 10, automobile; 1, hood; 21, vent cover plate; 2, wiper; 3, front windshield; 5, front cross beam; 6, hood sealing strip; 7, first noise reduction piece; 701, first noise reduction hole; 8, second noise reduction piece; 801, second noise reduction hole; 70, noise reduction component; 101, cavity; 71, partition; 9, sound-absorbing material. DETAILED DESCRIPTION

[0022] The present application will be further described in details below in conjunction with the drawings and embodiments. It is particularly pointed out that the following embodiments are only used to illustrate the present application, but do not limit the scope of the present application. Similarly, the following embodiments are only some embodiments of the present application, but not all embodiments of the present application, and all other embodiments obtained by those skilled in the art without any creative effort are within the scope of protection of the present application.

[0023] In this document, reference to“an embodiment” means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase“in an embodiment” in various places in the specification are not necessarily all referring to the same embodiment, nor are they necessarily mutually exclusive of one another. Those skilled in the art will appreciate that embodiments described herein can be combined with other embodiments in various ways.

[0024] In the description of the present application, it is necessary to point out that, unless otherwise explicitly specified and limited, the terms“mounting”,“setting”,“connecting”,“connecting” should be understood broadly, for example, it can be fixedly connected, it can be detachably connected, or integrally connected; it can be mechanically connected, or electrically connected; it can be directly connected, or connected through an intermediate medium. For those skilled in the art, the above-mentioned specific meanings can be connected according to the specific circumstances.

[0025] In the description of the application, the description of the terms "one embodiment", "some embodiments", "an example", "a specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the application. In the description, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any suitable manner in any one or more embodiments or examples. In addition, different embodiments or examples described in the specification and the features of different embodiments or examples can be combined and combined by those skilled in the art without contradiction.

[0026] In addition, the terms "first", "second" are only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined with "first", "second" can explicitly or implicitly include at least one of the features. In the description of the application, the meaning of "multiple" is at least two, for example, two, three, etc., unless otherwise specifically limited.

[0027] The cavity along the lower edge of the hood of the automobile is one of the main wind noise sources on the automobile. The airflow flowing through the hood adheres to the front windshield after separation at the edge thereof, because there is a large cavity along the lower edge of the hood, the pressure inside the cavity is low, the cavity will suck the external airflow into the cavity, and strong pressure pulsation and wind noise will be generated in the area where the front windshield is located. Since the sound insulation ability of the front windshield is relatively weak, the pressure pulsation and wind noise of the airflow outside the vehicle can easily affect the inside of the vehicle. Therefore, the shape of the hood and the cavity along the lower edge of the hood are very critical to the wind noise of the whole vehicle. If the shape of the rear edge of the hood is not well designed, the separation of the airflow at the rear end of the hood is caused, that is, the airflow cannot flow along the hood, the airflow will generate vortex sound due to separation, and at the same time, the airflow will be sucked into the cavity along the lower edge of the hood, thereby generating wind noise, which will bring a poor driving experience to the passengers.

[0028] The application provides an automobile, which places a noise reduction assembly between the hood and the vent cover plate, and the noise reduction assembly has a double noise reduction function. Specifically, the noise reduction assembly can have a specific optimized shape, which can make the airflow along the rear edge of the hood flow more smoothly, and the airflow can flow less into the cavity of the hood and the wiper cover plate. Many regular holes can be opened on the noise reduction assembly, and special porous sound-absorbing materials can also be arranged in the noise reduction assembly, so that the noise reduction assembly can have the ability to absorb the noise of the airflow at the lower edge of the hood. The structure of the noise reduction assembly of the application is simple, the cost is low, and the noise reduction effect is good.

[0029] The type of the automobile provided in the application can be an internal combustion engine automobile, an electric automobile, a hybrid automobile, a plug-in hybrid automobile, and a fuel cell automobile, etc. The internal combustion engine automobile refers to an automobile using gasoline or diesel as fuel. The electric automobile refers to an automobile relying on electricity for driving. The hybrid automobile refers to an automobile using an internal combustion engine and an electric motor as power sources. The plug-in hybrid automobile refers to an automobile that can be externally charged, and the electric motor and the internal combustion engine can drive the automobile. The fuel cell automobile refers to an automobile using a hydrogen fuel cell as a power source.

[0030] The specific structure of the noise reduction assembly in the automobile provided in the application will be described in detail below.

[0031] Please refer to Figure 1 , as shown in the figure, Figure 1 is a structural schematic diagram of an automobile when no noise reduction assembly is placed between the hood and the vent cover plate. The automobile 10 includes a hood 1, a vent cover plate 21, a wiper shaft 2, a front windshield 3, a wiper cover plate 4, a front cross beam 5, a hood sealing strip 6, etc.

[0032] Among them, the vent cover plate 21 is arranged on the lower side of the hood 1, and a cavity 101 is formed between the hood 1 and the vent cover plate 21. As Figure 1 shown, when the automobile 10 is running, the airflow will be divided into two directions after passing the rear edge of the hood 1, and the two directions are airflow direction A and airflow direction B. The airflow direction A hits the front windshield 3 along the rear edge of the hood 1. The airflow direction B enters the cavity 101 between the hood 1 and the vent cover plate 21, and the airflow entering the cavity 101 will swirl, forming a vortex noise. Because there is a relatively large cavity 101 below the hood 1 of the automobile 10, when the airflow from the hood 1 flows through the cavity 101, a vortex sound of the cavity 101 will be generated. The frequency of the vortex noise is 500-2000 Hz, which is a noise that can be easily perceived by the human ear, and therefore has a greater impact on the driver and the passenger.

[0033] In the application, as Figure 2 shown, Figure 2 is a structural schematic diagram of an embodiment of an automobile provided in the application. Specifically, in the application, a noise reduction assembly 70 is added between the hood 1 and the vent cover plate 21 of the automobile 10, and the noise reduction assembly 70 is arranged in the cavity 101 between the hood 1 and the vent cover plate 21, and the noise reduction assembly 70 is used to block the cavity 101. The cavity 101 between the hood 1 and the vent cover plate 21 is reduced, which means that the airflow entering the cavity 101 will also be reduced. In this way, the energy of the noise source can be reduced, which can reduce the noise source in the first level.

[0034] Further, the upper surface of the noise reduction assembly 70 is connected with the lower surface of the hood 1 to fix the noise reduction assembly 70. In other embodiments, a fixing member (not shown) can be arranged in the cavity 101 to mount the noise reduction assembly 70 on the fixing member.

[0035] Optionally, the upper surface of the noise reduction assembly 70 is adapted to the shape of the lower surface of the hood 1 to fit the upper surface of the noise reduction assembly 70 with the lower surface of the hood 1. That is, the upper surface of the noise reduction assembly 70 abuts the lower surface of the hood 1 to avoid the air flow into the gap between them to form vortex flow, thereby reducing the wind noise. Optionally, the upper surface of the noise reduction assembly 70 can be fixed to the lower surface of the hood 1 by bonding. In this way, the fixing structure is simple, and the assembly of the noise reduction assembly 70 is simplified. In other embodiments, the upper surface of the noise reduction assembly 70 can be fixed to the lower surface of the hood 1 by welding. In this way, the fixing reliability is high. In other embodiments, the noise reduction assembly 70 can be fixed to the lower surface of the hood 1 by the cooperation of the assembly hole and the fastener. In this way, the noise reduction assembly 70 and the hood 1 are detachably connected, so that the assembly and disassembly of the noise reduction assembly 70 are facilitated. The fixing manner of the noise reduction assembly 70 and the hood 1 can be selected according to actual needs, which is not limited herein.

[0036] The lower surface of the noise reduction assembly 70 and the upper surface of the vent cover plate 21 have a gap to enable the vent cover plate 21 to normally ventilate. The gap should be designed as small as possible, but at least should meet the need of normal ventilation of the vent cover plate 21.

[0037] The side of the noise reduction assembly 70 close to the opening of the cavity 101 is inclined to the outside of the cavity 101 in the direction from the hood 1 to the vent cover plate 21. That is, the noise reduction assembly 70 further comprises a side surface (not shown), which connects the upper surface and the lower surface of the noise reduction assembly 70, and is located at the opening of the cavity 101. The distance between the side surface of the noise reduction assembly 70 and the front windshield 3 gradually decreases in the direction from the upper surface to the lower surface of the noise reduction assembly 70. That is, the side surface of the noise reduction assembly 70 is inclined to the side close to the front windshield 3, so that the air flow can be guided to reduce the air flow into the cavity 101.

[0038] Although the noise reduction assembly 70 is arranged in the cavity 101 in the above embodiments, part of the air flow will still enter the cavity 101 between the vent cover plate 21 and the hood 1. In order to reduce the noise of the part of the air flow, the structure of the noise reduction assembly 70 is further improved in the present application. The further improvement of the noise reduction assembly 70 will be described in detail below.

[0039] Specifically, the noise reduction assembly 70 is formed with a receiving cavity (not shown), such as Figure 2As shown, the accommodating cavity is provided with a partition plate 71, the partition plate 71 is used for separating the noise reduction assembly 70 into a first noise reduction piece 7 and a second noise reduction piece 8, the second noise reduction piece 8 is arranged on the side of the first noise reduction piece 7 away from the front windshield 3, that is, the second noise reduction piece 8 is arranged at the front end, and the first noise reduction piece 7 is arranged at the rear end. The height of the first noise reduction piece 7 in the vertical direction is greater than that of the second noise reduction piece 8. The first noise reduction piece 7 is arranged at a position with a greater depth of the cavity 101, and the second noise reduction piece 8 is arranged at a position with a smaller depth of the cavity 101. The depth of the cavity 101 here refers to the width of the spacing direction of the hood 1 and the ventilation cover plate 21. That is, the average height of the first noise reduction piece 7 is greater than that of the second noise reduction piece 8. The height here refers to the length along the spacing direction of the hood 1 and the ventilation cover plate 21.

[0040] Further, as shown, Figure 2 The surface of the first noise reduction piece 7 is provided with a first noise reduction hole 701 communicating with the accommodating cavity, and the surface of the second noise reduction piece 8 is provided with a second noise reduction hole 801 communicating with the accommodating cavity, and the first noise reduction hole 701 and the second noise reduction hole 801 are regularly arranged. The aperture of the first noise reduction hole 701 is greater than the aperture of the second noise reduction hole 801. Since the first noise reduction piece 7 is located at an upper position, the airflow just enters the cavity 101 at this time, and the noise frequency generated is relatively low, generally 500-1000Hz, and the size of the opening (the first noise reduction hole 701) of the first noise reduction piece 7 is relatively large to reduce low-frequency noise. The corresponding noise frequency of the second noise reduction piece 8 which is relatively low in the vertical direction is relatively high, and the size of the surface opening (the second noise reduction hole 801) of the second noise reduction piece 8 is relatively small to correspond to the high-frequency noise source. By opening noise reduction holes of different sizes on the surface of the noise reduction assembly 70, different frequency noise sources can be corresponded.

[0041] Further, the aperture of the first noise reduction hole 701 is about 1-3mm, for example, the aperture of the first noise reduction hole 701 can be 1mm, 1.5mm, 2mm, 2.5mm or 3mm, etc. to reduce low-frequency noise. The aperture of the second noise reduction hole 801 is less than 1mm, for example, the aperture of the second noise reduction hole 801 can be 0.9mm, 0.8mm, 0.7mm, 0.6mm, 0.5mm, etc. to absorb high-frequency noise.

[0042] The depth of the accommodating cavity corresponding to the first noise reduction piece 7 is greater than the depth of the accommodating cavity corresponding to the second noise reduction piece 8, wherein the depth direction of the accommodating cavity is the spacing direction of the hood 1 and the ventilation cover plate 21. In this way, the first noise reduction piece 7 can absorb low-frequency noise, and the second noise reduction piece 8 can absorb high-frequency noise. The principle of the design of the first noise reduction piece 7 and the second noise reduction piece 8 will be described in detail below.

[0043] Each resonance structure has a certain inherent frequency, which is determined by the small hole aperture d of the resonance structure, the plate thickness t of the resonance structure, and the depth L of the accommodating cavity formed by the resonance structure. When the frequency of the external sound wave is the same as the inherent frequency of the resonance sound absorption, resonance phenomenon occurs, the amplitude is the largest, the speed of the air column in the aperture reciprocating motion is the largest, the friction loss is the largest, and the sound energy absorbed also reaches the maximum value. The sound frequency absorbed by the resonance structure is calculated according to the following formula:

[0044] f0=c / 2π(P / (t+0.8d)L)0.5

[0045] Wherein: f0 is the frequency of the sound absorbed by the resonance structure; L represents the depth of the accommodating cavity formed by the resonance structure; t is the plate thickness of the resonance structure, d is the small hole aperture d of the resonance structure, c is the sound speed, and P is the perforation rate (perforated area / total area).

[0046] It can be seen that the sound absorption frequency of the resonance structure is inversely proportional to the depth of the accommodating cavity formed by the resonance structure and the small hole aperture of the resonance structure. The larger the opening size of the resonance structure is, the deeper the depth of the accommodating cavity formed by the resonance structure is, and the lower the frequency noise can be absorbed. The smaller the opening size of the resonance structure is, the smaller the depth of the accommodating cavity formed by the resonance structure is, and the higher the frequency noise can be absorbed.

[0047] Therefore, through the above design, the depth of the accommodating cavity corresponding to the first noise reduction piece 7 is greater than the depth of the accommodating cavity corresponding to the second noise reduction piece 8, the size of the first noise reduction hole 701 opened on the first noise reduction piece 7 is greater than the size of the second noise reduction hole 801 opened on the second noise reduction piece 8, so that the first noise reduction piece 7 can absorb low-frequency noise, and the second noise reduction piece 8 can absorb high-frequency noise. For the noise entering the rear edge of the cover 1, the relatively low-frequency noise is first absorbed, and the relatively high-frequency noise is absorbed for the noise entering the inside of the cavity 101. In this way, the second level of noise source reduction can be achieved.

[0048] Further, as shown in Figure 3 , the sound-absorbing material 9 can also be arranged in the accommodating cavity formed by the noise reduction assembly 70 to further enhance the sound-absorbing effect. The waterproof and mildew-proof porous sound-absorbing material 9 filled in the accommodating cavity can further fully absorb the noise entering the inside of the noise reduction assembly 70. This is the third level of noise source reduction.

[0049] The sound-absorbing material 9 can be a porous sound-absorbing material, wherein the porous sound-absorbing material is a material widely used in the field of acoustics, which absorbs sound waves through its unique porous structure to reduce noise. In some specific embodiments, the sound-absorbing material 9 can include four types of organic fibers, inorganic fibers, inorganic foams, and foam plastics. Among them, the organic fiber sound-absorbing material mainly refers to natural plant fibers and synthetic fibers. The foam plastic sound-absorbing material is made of resin as a base material and auxiliary materials such as foaming agents, such as polyurethane foam sound-absorbing material.

[0050] The first noise reduction hole 701 and the second noise reduction hole 801 are opened on the surface of the noise reduction assembly 70, and the accommodating cavity formed by the noise reduction assembly 70 acts as a resonance cavity. When the sound wave is transmitted to the noise reduction assembly 70, the gas in the noise reduction hole reciprocates under the pressure of the sound wave, and through the friction and damping effect of the hole wall surface, a part of the sound energy is converted into heat energy and consumed. If the accommodating cavity is filled with the sound-absorbing material 9, the sound-absorbing material 9 mainly relies on the space structure formed by the porous medium to generate viscous force on the incident sound wave, consumes sound energy to achieve sound absorption effect. Within a certain range, the larger the porosity of the sound-absorbing material 9, the more porous it is, and the better the sound absorption effect. The sound-absorbing material 9 in the accommodating cavity can further improve the sound absorption efficiency, and the noise reduction effect is further enhanced.

[0051] The noise reduction holes are opened on the noise reduction assembly 70, and the air layer (accommodating cavity) is arranged behind the plate. If necessary, the porous sound-absorbing material is added in the accommodating cavity, which can form a resonance sound-absorbing structure of the noise reduction assembly 70. Since there is an air layer corresponding to each opening hole, each noise reduction assembly 70 is a parallel Helmholtz resonance cavity. Each Helmholtz resonance cavity is a resonance system composed of mass and spring. The air in the open pipe vibrates with the sound wave, which is a sound mass element. The pressure in the open pipe changes with the expansion and contraction of the air, which is a sound compliance element. The pressure in the accommodating cavity vibrates with the sound wave to a certain extent. The vibration friction of the air on the opening wall surface will cause the loss of sound energy due to the viscous effect and heat conduction effect. Its acoustic effect is a sound resistance. When the frequency of the incident wave is consistent with the resonance frequency of the system, the air column in the aperture vibrates strongly, the air in the noise reduction assembly 70 vibrates strongly, the absorption effect is enhanced, an absorption peak is formed, and the sound energy is significantly attenuated. If the sound-absorbing material 9 is placed in the noise reduction assembly 70 to increase the sound resistance, the structure absorption band will be widened. The sound mass and sound compliance of the accommodating cavity are increased, the end impedance of the noise reduction hole on the noise reduction assembly 70 is also increased, the effective depth of the accommodating cavity is increased, the effective length of the noise reduction hole is increased, the resonance frequency moves to the low frequency direction, the sound absorption coefficient is improved, and the sound absorption effect is enhanced.

[0052] In the application, the noise reduction assembly 70 is added under the cover 1 to reduce the cavity 101 at the lower edge of the cover 1, the airflow pressure absorbed by the cavity 101 at the lower edge of the cover 1 is reduced, the airflow entering the cavity 101 after flowing through the cover 1 is reduced, and in this way, the wind noise at the end of the cover 1 can be reduced. The noise reduction holes (the first noise reduction hole 701 and the second noise reduction hole 801) with two kinds of apertures are opened on the noise reduction assembly 70, because the frequency of the airflow initially entering the cavity 101 of the cover 1 is low, the first noise reduction piece 7 absorbing low-frequency noise is used, the size of the first noise reduction hole 701 on the first noise reduction piece 7 is small, and it is aimed at low-frequency noise. The airflow enters the inside of the cavity 101, the noise frequency generated by the airflow is high frequency, the second noise reduction piece 8 absorbing high-frequency noise is used, the size of the second noise reduction hole 801 on the second noise reduction piece 8 is small, and it is aimed at high-frequency noise, in this way, different frequency noises can be absorbed. The sound-absorbing material 9 can also be added in the accommodating cavity, the addition of the sound-absorbing material 9 can further enhance the sound-absorbing effect of the noise reduction assembly 70. In the automobile 10 provided in the application, the noise reduction assembly 70 is added, the structure of the noise reduction assembly 70 is simple, the cost is low, the assembly is simple, the wind noise can be greatly reduced, the influence on the driver and the passenger is reduced, and the noise reduction assembly 70 has strong practicability.

[0053] The above-described embodiments do not constitute a limitation on the protection scope of the technical solutions. Any modification, equivalent replacement and improvement made within the spirit and principles of the above-described embodiments shall be included in the protection scope of the technical solutions.

Claims

1. A car, characterized in that: The car includes: hood; a ventilation cover plate, arranged on the lower side of the machine cover, with a cavity formed between the machine cover and the ventilation cover plate; A noise reduction component is provided in the cavity, the noise reduction component is used to block the cavity, the noise reduction component is formed with a receiving cavity, a surface of the noise reduction component is provided with a plurality of noise reduction holes connected to the receiving cavity, a partition is provided in the receiving cavity, the partition separates the noise reduction component into a first noise reduction component and a second noise reduction component, the first noise reduction component is closer to the opening of the cavity than the second noise reduction component, A first noise reduction hole communicating with the accommodating cavity is provided on the surface of the first noise reduction component, and a second noise reduction hole communicating with the accommodating cavity is provided on the surface of the second noise reduction component, wherein the aperture of the first noise reduction hole is larger than the aperture of the second noise reduction hole.

2. The automobile according to claim 1, characterized in that The noise reduction component is connected to the machine cover.

3. The automobile according to claim 2, characterized in that The shape of the upper surface of the noise reduction component is adapted to the shape of the lower surface of the cover, so that the upper surface of the noise reduction component is in contact with the lower surface of the cover. A gap is formed between the lower surface of the noise reduction component and the upper surface of the ventilation cover.

4. The automobile according to claim 1, characterized in that The aperture of the first noise reduction hole ranges from 1 to 3 mm.

5. The automobile according to claim 1, characterized in that The aperture of the second noise reduction hole is less than 1 mm.

6. The automobile according to claim 1, characterized in that The depth of the accommodating cavity corresponding to the first noise reduction component is greater than the depth of the accommodating cavity corresponding to the second noise reduction component, wherein the depth direction of the accommodating cavity is the spacing direction of the machine cover and the ventilation cover plate.

7. The automobile according to claim 1, characterized in that Sound-absorbing material is provided in the accommodating cavity.

8. The automobile according to claim 3, characterized in that A side of the noise reduction component close to the opening of the cavity is inclined toward the outside of the cavity in a direction from the machine cover to the ventilation cover plate.

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