Sound absorption device and vehicle

Abstract

The utility model relates to the technical field of vehicles, and provides a sound absorption device and a vehicle, the sound absorption device comprises a surface layer part, the sound absorption device is further provided with a resonant cavity, the resonant cavity is used for absorbing low-frequency sound waves, and the resonant cavity is formed on the side, away from the surface layer part, facing the interior space of the vehicle. According to the technical scheme, the resonant cavity is formed in the side, away from the surface layer part and facing the space in the vehicle, of the surface layer part, low-frequency sound waves can be absorbed, the frequency band of the sound waves capable of being absorbed by the sound absorption device is effectively expanded, the sound absorption effect is good, and the NVH performance of the whole vehicle is effectively improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of vehicles, in particular to an acoustic absorption device and a vehicle. BACKGROUND

[0002] In the case of noise generated outside the vehicle, such as through the floor constituting the floor surface of the vehicle, being transmitted into the vehicle as transmission sound, the comfort of the passengers can be affected by the transmission sound, and therefore some carpets are provided to block the noise from entering the vehicle space.

[0003] In the related art, the acoustic absorption effect of the carpet in the vehicle is poor. CONTENT OF THE UTILITY MODEL

[0004] The embodiments of the present application provide an acoustic absorption device, which improves the noise frequency band of the acoustic absorption device to at least partially solve the above technical problems.

[0005] In order to achieve the above-mentioned purpose, according to the first aspect of the present application, an acoustic absorption device is provided, comprising:

[0006] a surface layer, arranged towards a vehicle space;

[0007] The acoustic absorption device further has:

[0008] a resonance cavity for absorbing low-frequency sound waves;

[0009] The resonance cavity is formed on the side of the surface layer away from the vehicle space.

[0010] Optionally, the acoustic absorption device further comprises:

[0011] a first acoustic absorption structure having a first resonance cavity in communication with an external environment at one end, for absorbing first frequency band sound waves; and

[0012] a second acoustic absorption structure having a second resonance cavity independent of the external environment, for absorbing second frequency band sound waves different from the first frequency band sound waves;

[0013] The first acoustic absorption structure and the second acoustic absorption structure are arranged in layers on the side of the surface layer away from the vehicle space.

[0014] Optionally, the first acoustic absorption structure is arranged away from the surface layer relative to the second acoustic absorption structure.

[0015] Optionally, the first acoustic absorption structure comprises:

[0016] a bottom layer arranged away from the vehicle space relative to the surface layer;

[0017] a first forming layer located between the bottom layer and the surface layer, for forming the first resonance cavity;

[0018] The bottom layer member has a through hole for the first resonant cavity to communicate with the external environment.

[0019] Optionally, the second sound absorption structure comprises:

[0020] A second forming member is located on the side of the first forming member away from the bottom layer member, and is used to form the second resonant cavity.

[0021] A secondary bottom layer member is located between the first forming member and the second forming member.

[0022] The secondary bottom layer member is used to make the second resonant cavity independent of the external environment.

[0023] Optionally, the first forming member has:

[0024] A plurality of first cavities arranged along a first direction, and two ends of the first cavities are arranged in an open manner along a second direction.

[0025] The bottom layer member blocks one of the openings, and the secondary bottom layer member is used to block the other opening to form the first resonant cavity which communicates with the external environment through the through hole of the bottom layer member.

[0026] Optionally, the second forming member and the secondary bottom layer member define a second cavity therebetween.

[0027] The secondary bottom layer member is also used to block the second cavity to form the second resonant cavity which is independently arranged from the external environment.

[0028] Optionally, the sound absorption device further comprises:

[0029] A third sound absorption structure is located in the second cavity.

[0030] The third sound absorption structure has a sound absorption cavity for absorbing third frequency band sound waves different from the first frequency band sound waves and the second frequency band sound waves.

[0031] Optionally, the third sound absorption structure comprises a third forming member for forming the sound absorption cavity.

[0032] The secondary bottom layer member covers at least the surface of the third forming member facing the first forming member to block the second cavity.

[0033] Optionally, the first forming member is made of gel material or paperboard material.

[0034] Optionally, the second forming member and / or the third forming member are made of porous material.

[0035] Optionally, the vertical distance between the secondary forming member and the sub-bottom member is set to 6mm to 10mm.

[0036] Optionally, the thickness of the tertiary forming member is 6mm to 10mm.

[0037] Optionally, the surface layer member is bonded between the secondary forming member.

[0038] Optionally, the sound absorption device comprises a carpet.

[0039] According to a second aspect of the present application, a vehicle is provided, comprising a sound absorption device as described above.

[0040] The present application has the beneficial effect of providing a sound absorption device with good sound absorption effect.

[0041] More specifically, some embodiments of the present application can have the following specific beneficial effects:

[0042] In the sound absorption device of the embodiments of the present application, the sound absorption device comprises a surface layer member, and further comprises a resonance cavity, wherein the resonance cavity is used for absorbing low-frequency sound waves, and the resonance cavity is formed on the side away from the surface layer member and towards the vehicle interior space. Through the above technical solution, the resonance cavity is formed on the side away from the surface layer member and towards the vehicle interior space, which can absorb low-frequency sound waves, effectively expand the frequency band of sound waves that can be absorbed by the sound absorption device, have good sound absorption effect, and effectively improve the overall vehicle NVH performance.

[0043] Other features and advantages of the present application will be described in detail in the following specific embodiments. BRIEF DESCRIPTION OF DRAWINGS

[0044] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments description. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor on the basis of these drawings.

[0045] In order to more completely understand the present application and its beneficial effects, the following will be described in conjunction with the drawings, wherein the same reference numerals in the following description represent the same parts.

[0046] Figure 1 is the overall structure cross-sectional view of the sound absorption device provided in the exemplary embodiments of the present application;

[0047] Figure 2 is the cross-sectional exploded view of the sound absorption device provided in the exemplary embodiments of the present application;

[0048] Figure 3Fig. 1 is a structural schematic diagram of a primary resonant cavity and a secondary resonant cavity of a sound absorption device provided in an exemplary embodiment of the present application;

[0049] Figure 4 Fig. 2 is a structural schematic diagram of a resonant cavity of a sound absorption device provided in an exemplary embodiment of the present application

[0050] Figure 5 Fig. 3 is a structural schematic diagram of a primary forming member located between a bottom layer member and a sub-bottom layer member provided in an exemplary embodiment of the present application;

[0051] Figure 6 Fig. 4 is a structural schematic diagram of a primary forming member provided in an exemplary embodiment of the present application; Figure 5

[0052] Figure 7 Fig. 5 is a structural schematic diagram of a whole vehicle provided in an exemplary embodiment of the present application.

[0053] Figure 8 Fig. 6 is a structural schematic diagram of a whole vehicle provided in an exemplary embodiment of the present application.

[0054] BRIEF DESCRIPTION OF THE DRAWINGS

[0055] 100, a sound absorption device;

[0056] 110, a surface layer member; 100a, a resonant cavity;

[0057] 120, a primary sound absorption structure; 120a, a primary resonant cavity; 120b, a primary cavity;

[0058] 121, a bottom layer member; 122, a primary forming member; 121a, a via hole;

[0059] 130, a secondary sound absorption structure; 130a, a secondary resonant cavity; 130b, a secondary cavity;

[0060] 131, a secondary forming member; 132, a sub-bottom layer member;

[0061] 140, a tertiary sound absorption structure; 141, a tertiary forming member;

[0062] 10, a vehicle. DETAILED DESCRIPTION

[0063] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by a person skilled in the art without creative labor fall within the protection scope of the present application.

[0064] ​According to a first aspect of the present application, an acoustic absorption device 100 is provided, which can effectively improve the overall vehicle NVH performance, referring to Figures 1 to 7 The acoustic absorption device 100 comprises a surface layer 110, and further comprises a resonance cavity 100a for absorbing low-frequency sound waves, wherein the resonance cavity 100a is formed on the side of the surface layer 110 away from the vehicle interior space.

[0065] By forming the resonance cavity 100a on the side of the surface layer 110 away from the vehicle interior space, low-frequency sound waves can be absorbed, effectively expanding the frequency band of sound waves that can be absorbed by the acoustic absorption device 100, and improving the acoustic absorption effect and the overall vehicle NVH performance.

[0066] Exemplarily, the surface layer 110 can be a needle-punched carpet surface layer made of polyester material with a thickness of 1.8 mm and a density of 550 kg / m3. The surface layer 110 can also absorb low-frequency sound waves, further improving the acoustic absorption effect of the acoustic absorption device 100.

[0067] In the present application, Figure 1 Z in the formula is the direction of sound wave transmission.

[0068] In some embodiments, referring to Figures 1 to 7 The acoustic absorption device 100 comprises a primary acoustic absorption structure 120 and a secondary acoustic absorption structure 130, wherein the surface layer 110 is arranged towards the vehicle interior space, the primary acoustic absorption structure 120 has a primary resonance cavity 120a connected to the external environment at one end for absorbing first frequency sound waves, and the secondary acoustic absorption structure 130 has a secondary resonance cavity 130a independent of the external environment for absorbing second frequency sound waves different from the first frequency sound waves, wherein the primary acoustic absorption structure 120 and the secondary acoustic absorption structure 130 are arranged in layers on the side of the surface layer 110 away from the vehicle interior space.

[0069] By arranging the primary acoustic absorption structure 120 and the secondary acoustic absorption structure 130 in layers on the side of the surface layer 110 away from the vehicle interior space, the primary resonance cavity 120a of the primary acoustic absorption structure 120 and the secondary resonance cavity 130a of the secondary acoustic absorption structure 130 can be used to absorb first frequency sound waves and second frequency sound waves of different frequency bands, thereby improving the acoustic absorption effect and the overall vehicle NVH performance.

[0070] It can be understood that the sound waves of the noise excite the primary resonance cavity 120a of the primary acoustic absorption structure 120 and the secondary resonance cavity 130a of the secondary acoustic absorption structure 130 to produce vibrations and maximize the amplitude, thereby widening the sound absorption frequency band and improving the acoustic absorption performance of the acoustic absorption device 100.

[0071] The attracting device in the present application can include a carpet, and the carpet is placed in the carpet and described by the carpet when introducing the effect.

[0072] The first frequency band of sound waves absorbed by the first-order resonance cavity 120a of the first-order sound-absorbing structure 120 is in tens of hertz to hundreds of hertz, and the resonance peak of the second-order resonance cavity 130a of the second-order sound-absorbing structure 130 is 350 Hz. Therefore, the second frequency band of sound waves corresponds to the mid-frequency noise in the range of 250 Hz to 2000 Hz. In this way, the frequency band of sound waves that can be absorbed by the sound-absorbing device 100 as a whole is widened, the problem of lack of low-frequency sound-absorbing capability of the previous car carpet is effectively improved, the low-frequency sound-absorbing capability of the car carpet is significantly improved, the strong low-frequency sound-absorbing performance is realized, and the overall acoustic performance of the car carpet is optimized.

[0073] In some embodiments, the first-order sound-absorbing structure 120 is arranged away from the surface layer 110 relative to the second-order sound-absorbing structure 130.

[0074] Reference Figure 1 By arranging the first-order sound-absorbing structure 120 away from the surface layer 110 relative to the second-order sound-absorbing structure 130, after the noise enters the first-order resonance cavity 120a, the first-order frequency band of sound waves is absorbed in the first-order resonance cavity 120a, and the second-order frequency band of sound waves passes through the first-order sound-absorbing structure 120 and enters the second-order resonance cavity 130a of the second-order sound-absorbing structure 130, and is absorbed by the second-order resonance cavity 130a. The sound-absorbing level is clear, and the sound-absorbing frequency band is wide.

[0075] In some embodiments, with reference to Figure 1 and Figure 2 The first-order sound-absorbing structure 120 includes a bottom layer 121 and a first-order forming part 122.

[0076] The bottom layer 121 is arranged away from the interior space of the vehicle relative to the surface layer 110, and the first-order forming part 122 is located between the bottom layer 121 and the surface layer 110 and is used to form the first-order resonance cavity 120a.

[0077] The bottom layer 121 has a through hole 121a corresponding to the first-order resonance cavity 120a, so that the first-order resonance cavity 120a is in communication with the external environment.

[0078] By arranging the through hole 121a in the bottom layer 121 corresponding to the first-order resonance cavity 120a, the first-order resonance cavity 120a can be in communication with the external environment, forming a perforated plate resonance structure, which can absorb low-frequency sound waves and has good absorption effect.

[0079] Exemplarily, the bottom layer 121 can be a hard polyester fiber felt plate with a thickness of 0.5 mm and a density of 1100 kg / m3. The perforation rate of the hard polyester fiber felt plate is 1%, the hole diameter is 1 mm, and the perforation spacing is 9 mm.

[0080] In some embodiments, referring to Figure 1 and Figure 2 The secondary sound absorption structure 130 comprises a secondary forming member 131 and a secondary bottom member 132.

[0081] The secondary forming member 131 is located on the side of the primary forming member 122 away from the bottom member 121, and the secondary resonant cavity 130a is formed by the secondary forming member 131. The secondary bottom member 132 is located between the primary forming member 122 and the secondary forming member 131, and the secondary bottom member 132 can make the secondary resonant cavity 130a independent of the external environment.

[0082] By using the secondary forming member 131 to form the secondary resonant cavity 130a independent of the external environment, the secondary resonant cavity 130a independent of the external environment can absorb sound waves with a second frequency band greater than the first frequency band, thereby widening the sound absorption frequency band of the sound absorption device 100.

[0083] Exemplarily, the secondary bottom member 132 can be a film, such as a polyester film, with a thickness of 0.1 mm, which can form a film resonant structure to absorb more sound waves.

[0084] In some embodiments, referring to Figure 7 The primary forming member 122 has a plurality of primary cavities 120b.

[0085] The plurality of primary cavities 120b are arranged along the first direction, and the two ends of the primary cavities 120b are arranged to be open along the second direction. One opening is blocked by the bottom member 121, and the other opening is blocked by the secondary bottom member 132 to form a primary resonant cavity 120a connected to the external environment through a via hole 121a of the bottom member 121.

[0086] By arranging the plurality of primary cavities 120b along the first direction on the primary forming member 122, a honeycomb-shaped primary sound absorption structure 120 can be formed, which can connect the plurality of primary cavities 120b in parallel, and the structure can widen the sound absorption frequency band.

[0087] In some embodiments, referring to Figure 1 , Figure 4 A secondary cavity 130b is defined between the secondary forming member 131 and the secondary bottom member 132, and the secondary bottom member 132 can also block the secondary cavity 130b to form a secondary resonant cavity 130a independent of the external environment.

[0088] The secondary bottom layer member 132 is used to block the secondary cavity 130b, so that the secondary cavity 130a is formed independently from the external environment, the secondary bottom layer member 132 is reused, and the first sound absorption structure 120 and the secondary sound absorption structure 130 are connected in series to absorb sound waves in multiple frequency bands.

[0089] The film and the secondary cavity 130b form a resonance system, and the resonance system has a large sound absorption effect near the system resonance frequency. The sound wave excites the resonance sound absorption structure to produce vibration and maximize the amplitude, thereby absorbing sound by consuming sound energy. The resonance peak of the structure is about 350 Hz, and the low-frequency sound absorption effect can be obviously improved.

[0090] Specifically, the secondary forming member 131 can be a hard fiber felt layer, and the space between the hard fiber felt layer and the film is used as the secondary cavity 130b, thereby forming a film cavity resonance structure.

[0091] In some embodiments, referring to Figure 2 , the sound absorption device 100 further includes a third sound absorption structure 140.

[0092] The third sound absorption structure 140 is located in the secondary cavity 130b, and the third sound absorption structure 140 has a sound absorption cavity for absorbing third frequency band sound waves different from the first frequency band sound waves and the second frequency band sound waves.

[0093] By arranging the third sound absorption structure 140 in the secondary cavity 130b, and the third sound absorption structure 140 having a sound absorption cavity, third frequency band sound waves different from the first frequency band sound waves and the second frequency band sound waves can be absorbed, and the effect of the resonance cavity composite sound absorption cavity on absorbing multiple frequency band sound waves is achieved.

[0094] In some embodiments, referring to Figure 2 , the third sound absorption structure 140 includes a third forming member 141 for forming a sound absorption cavity.

[0095] The secondary bottom layer member 132 covers at least a surface of the third forming member 141 facing the first forming member 122 to block the secondary cavity 130b.

[0096] By using the third forming member 141 to form the sound absorption cavity, and using the secondary bottom layer member 132 to cover at least the surface of the third forming member 141 facing the first forming member 122 to block the secondary cavity 130b, the blocking method is simple and easy to operate.

[0097] Exemplarily, the third forming member 141 can be a fiber felt layer, and the surface of the fiber felt layer is covered by the film, thereby achieving the effect of blocking the secondary cavity 130b, and the secondary resonance cavity 130a and the sound absorption cavity can absorb low-frequency and medium-high-frequency sound waves.

[0098] The sound absorption cavity composed of the sound absorption cavity resonance sound absorption structure composite fiber felt sound absorption layer widens the audio absorption frequency band, improves the low frequency sound absorption effect, and ensures the sound absorption ability of the carpet in the medium and high frequency. Thus, the wide frequency range sound absorption effect of 20-20000Hz considering high frequency and low frequency is realized.

[0099] In some embodiments, the first forming piece 122 is made of gel material or paperboard material.

[0100] Exemplarily, the first forming piece 122 adopts gel material, which can improve the overall tread comfort of the carpet. Thus, the sound absorption and comfort of the new carpet solution coexist.

[0101] The gel material can be TPE material.

[0102] In some embodiments, the second forming piece 131 is made of porous material, and the third forming piece 141 is made of porous material.

[0103] In the present application, the second forming piece 131 is made of porous material, which can constitute the second resonance cavity 130a and also absorb sound waves by itself.

[0104] Exemplarily, the second forming piece 131 in the present application can adopt a hard fiber felt layer, which is made of polyester fiber, has a thickness of 2mm, and has a density of 400kg / m3.

[0105] The third forming piece 141 can adopt a fiber felt layer, which is made of polyester fiber and has a density of 80-120kg / m3.

[0106] In some embodiments, the vertical distance between the second forming piece 131 and the secondary bottom piece 132 is set to 6mm to 10mm.

[0107] By setting the vertical distance between the second forming piece 131 and the secondary bottom piece 132 to 6mm to 10mm, a second cavity 130b with a thickness of 6mm to 10mm can be formed, which can be used to absorb sound waves and also place the third forming piece 141, realizing the combined use of the second resonance cavity 130a and the sound absorption cavity.

[0108] In some embodiments, the thickness of the third forming piece 141 is 6mm to 10mm.

[0109] By setting the thickness of the third forming piece 141 to 6mm to 10mm, as many sound absorption cavities as possible can be formed to improve the sound absorption effect.

[0110] Exemplarily, the third forming member 141 can adopt polyester fibers, which have sound absorption cavities capable of absorbing sound waves in a medium-high frequency band, and the fiber fineness is 3-10 denier, while the second resonant cavity 130a is compounded to absorb low-frequency sound waves, so as to widen the sound absorption frequency and realize a wide-range sound absorption effect.

[0111] In some embodiments, the surface layer member 110 is bonded with the second forming member 131.

[0112] In the present application, the top surface of the bottom layer member 121 is connected with the bottom surface of the first forming member 122 by adhesive connection, the top surface of the first forming member 122 is connected with the bottom surface of the sub-bottom layer member 132 by regional adhesive connection, the top surface of the sub-bottom layer member 132 is connected with the bottom surface of the third forming member 141 by regional adhesive connection, the top surface of the third forming member 141 is connected with the bottom surface of the second forming member 131 by low-melting-point PE powder melting bonding, and the top surface of the second forming member 131 is connected with the bottom surface of the surface layer member 110 by needle punching compounding.

[0113] In some embodiments, the sound absorption device 100 comprises a carpet.

[0114] The carpet comprises two cavity resonance sound absorption structures, one being a perforated plate cavity resonance sound absorption structure and the other being a thin film cavity resonance sound absorption structure. The double-layer cavity resonance composite sound absorption structure can significantly improve the low-frequency sound absorption effect of the carpet relative to a single-layer sound absorption structure.

[0115] The surface layer member 110 in the present application adopts a needle-punched carpet surface layer, the needle punching density is 1100 pokes / cm2, the needle punching holes are similar to microporous plates, and have a certain low-frequency sound absorption effect, the sound absorption coefficient is high at 200-300 Hz and can reach above 0.3.

[0116] According to a second aspect of the present application, referring to Figure 8 , a vehicle 10 is provided, which comprises the sound absorption device 100 as described above.

[0117] The vehicle 10 comprises the sound absorption device 100 described above. The vehicle 10 has all the beneficial effects of the sound absorption device 100 described above, which will not be repeated here.

[0118] The vehicle 10 can be a fuel automobile, a plug-in hybrid electric vehicle or a new energy vehicle, which is not specifically limited in the present application.

[0119] In the description of the present application, the terms "first" and "second" are only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features. Therefore, the features defined as "first" and "second" can explicitly or implicitly include one or more features. In the description of the present application, the meaning of "multiple" is two or more, unless otherwise specifically limited.

[0120] In the above embodiments, the description of each embodiment has its own focus, and the parts not described in detail in a certain embodiment can be referred to the relevant description of other embodiments.

[0121] The embodiments, implementation manners and related technical features of the present application can be combined or replaced with each other without conflict.

[0122] The above is only the preferred embodiment of the present application, and does not limit the present application in any form. Any simple modification, equivalent change and modification made to the above embodiment without departing from the technical solution content of the present application and in accordance with the technical essence of the present application still belongs to the scope of the technical solution of the present application.

Claims

1. A sound absorbing device, characterized in that: include: The surface part is arranged toward the interior space of the vehicle; The sound absorbing device further comprises: Resonance cavity, used to absorb low-frequency sound waves; The resonance cavity is formed on a side away from the surface member and facing the vehicle interior space.

2. The sound absorbing device according to claim 1, characterized in that The sound absorbing device comprises: a primary sound-absorbing structure having a primary resonance cavity with one end connected to the external environment, for absorbing sound waves in a first frequency band; and A secondary sound-absorbing structure having a secondary resonance cavity independent of the external environment, for absorbing sound waves of a second frequency band different from the sound waves of the first frequency band; The primary sound absorbing structure and the secondary sound absorbing structure are stacked and arranged on a side of the surface member away from the surface member and facing the vehicle interior space.

3. The sound absorbing device according to claim 2, characterized in that The primary sound absorbing structure is arranged away from the surface member relative to the secondary sound absorbing structure.

4. The sound absorbing device according to claim 2, characterized in that The primary sound absorbing structure comprises: A bottom layer member is arranged relative to the surface layer member and away from the vehicle interior space; a primary forming member, located between the bottom layer member and the surface layer member, and used to form the primary resonant cavity; Wherein, the bottom component has a through hole corresponding to the primary resonant cavity, so that the primary resonant cavity is connected with the external environment.

5. The sound absorbing device according to claim 4, characterized in that: The secondary sound absorbing structure comprises: a secondary forming member, located on a side of the primary forming member away from the bottom member, and used to form the secondary resonant cavity; a secondary bottom member located between the primary forming member and the secondary forming member; The sub-bottom layer is used to make the secondary resonant cavity independent from the external environment.

6. The sound absorbing device according to claim 5, characterized in that The primary forming member has: A plurality of primary cavities are arranged along a first direction, and both ends of the primary cavities are opened along a second direction; The bottom component blocks one of the openings, and the secondary bottom component blocks the other opening, so as to form the primary resonant cavity connected to the external environment through the via hole of the bottom component.

7. The sound absorbing device according to claim 6, characterized in that A secondary cavity is defined between the secondary forming member and the secondary bottom member; The secondary bottom member is further used to seal the secondary cavity to form a secondary resonance cavity that is independently provided from the external environment.

8. The sound absorbing device according to claim 7, characterized in that Also includes: A third-level sound-absorbing structure is located in the secondary cavity; Wherein, the three-stage sound absorption structure has a sound absorption cavity.

9. The sound absorbing device according to claim 8, characterized in that The three-stage sound absorbing structure includes three-stage forming members for forming the sound absorbing cavity; Wherein, the secondary bottom layer at least covers the surface of the tertiary forming member facing the primary forming member to block the secondary cavity.

10. The sound absorbing device according to claim 8, characterized in that The primary forming member is made of gel material or cardboard material.

11. The sound absorbing device according to claim 9, characterized in that The secondary forming member and / or the tertiary forming member are made of a porous material.

12. The sound absorbing device according to claim 5, characterized in that The vertical distance between the secondary forming part and the secondary bottom part is set to 6mm to 10mm.

13. The sound absorbing device according to claim 9, characterized in that The thickness of the tertiary formed member is 6 mm to 10 mm.

14. The sound absorbing device according to claim 5, characterized in that The surface layer member and the secondary forming member are bonded to each other.

15. The sound absorbing device according to any one of claims 1 to 14, characterized in that: The sound absorbing device includes a carpet.

16. A vehicle, characterized in that: The sound absorbing device comprises the sound absorbing device according to any one of claims 1 to 15.

Images