CN110154935B - Enclose before automobile body and give sound insulation and fill up and have its electric automobile - Google Patents
Enclose before automobile body and give sound insulation and fill up and have its electric automobile Download PDFInfo
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- CN110154935B CN110154935B CN201910504542.5A CN201910504542A CN110154935B CN 110154935 B CN110154935 B CN 110154935B CN 201910504542 A CN201910504542 A CN 201910504542A CN 110154935 B CN110154935 B CN 110154935B
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- 238000009413 insulation Methods 0.000 title claims abstract description 60
- 238000010521 absorption reaction Methods 0.000 claims abstract description 31
- 238000000034 method Methods 0.000 claims abstract description 6
- 230000008569 process Effects 0.000 claims abstract description 6
- 239000004743 Polypropylene Substances 0.000 claims description 8
- 239000011358 absorbing material Substances 0.000 claims description 8
- 239000004698 Polyethylene Substances 0.000 claims description 7
- 229920000742 Cotton Polymers 0.000 claims description 6
- -1 polyethylene Polymers 0.000 claims description 6
- 229920000139 polyethylene terephthalate Polymers 0.000 claims description 6
- 239000005020 polyethylene terephthalate Substances 0.000 claims description 6
- 239000011810 insulating material Substances 0.000 claims description 3
- 229920000573 polyethylene Polymers 0.000 claims description 2
- 229920001155 polypropylene Polymers 0.000 claims description 2
- 239000012212 insulator Substances 0.000 claims 4
- 239000000463 material Substances 0.000 abstract description 23
- 239000012774 insulation material Substances 0.000 abstract description 6
- 239000010410 layer Substances 0.000 description 72
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- 239000005038 ethylene vinyl acetate Substances 0.000 description 3
- 229920001200 poly(ethylene-vinyl acetate) Polymers 0.000 description 3
- 150000001875 compounds Chemical class 0.000 description 2
- 239000012814 acoustic material Substances 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000012938 design process Methods 0.000 description 1
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- 239000002356 single layer Substances 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
- B32B27/08—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/12—Layered products comprising a layer of synthetic resin next to a fibrous or filamentary layer
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/32—Layered products comprising a layer of synthetic resin comprising polyolefins
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/36—Layered products comprising a layer of synthetic resin comprising polyesters
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B33/00—Layered products characterised by particular properties or particular surface features, e.g. particular surface coatings; Layered products designed for particular purposes not covered by another single class
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
- B32B5/02—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by structural features of a fibrous or filamentary layer
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
- B32B5/22—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by the presence of two or more layers which are next to each other and are fibrous, filamentary, formed of particles or foamed
- B32B5/24—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by the presence of two or more layers which are next to each other and are fibrous, filamentary, formed of particles or foamed one layer being a fibrous or filamentary layer
- B32B5/26—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by the presence of two or more layers which are next to each other and are fibrous, filamentary, formed of particles or foamed one layer being a fibrous or filamentary layer another layer next to it also being fibrous or filamentary
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
- B32B7/02—Physical, chemical or physicochemical properties
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
- B60R13/00—Elements for body-finishing, identifying, or decorating; Arrangements or adaptations for advertising purposes
- B60R13/08—Insulating elements, e.g. for sound insulation
- B60R13/0884—Insulating elements, e.g. for sound insulation for mounting around noise sources, e.g. air blowers
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2262/00—Composition or structural features of fibres which form a fibrous or filamentary layer or are present as additives
- B32B2262/08—Animal fibres, e.g. hair, wool, silk
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2307/00—Properties of the layers or laminate
- B32B2307/10—Properties of the layers or laminate having particular acoustical properties
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2307/00—Properties of the layers or laminate
- B32B2307/10—Properties of the layers or laminate having particular acoustical properties
- B32B2307/102—Insulating
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2605/00—Vehicles
- B32B2605/08—Cars
Landscapes
- Physics & Mathematics (AREA)
- Acoustics & Sound (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Vehicle Interior And Exterior Ornaments, Soundproofing, And Insulation (AREA)
Abstract
The invention discloses a front wall sound insulation pad for a vehicle body, which comprises a first sound absorption layer, a second sound absorption layer stacked on the first sound absorption layer, a first sound insulation layer stacked on the second sound absorption layer, a second sound insulation layer stacked on the first sound insulation layer and a third sound insulation layer stacked on the second sound insulation layer. The front wall sound insulation pad for the vehicle body adopts a multi-layer sound insulation material and sound absorption material structure, so that the noise generated by a driving motor in the driving process of the electric vehicle can be effectively reduced, and the NVH (noise, vibration and harshness) performance of the electric vehicle is improved. The invention also discloses an electric automobile.
Description
Technical Field
The invention belongs to the technical field of new energy automobiles, and particularly relates to a front wall sound insulation pad of an automobile body and an electric automobile with the same.
Background
Along with the popularization of new energy automobiles, the improvement of the NVH performance of the automobiles is indispensable. The core difference between the conventional automobile and the electric automobile is that the driving source is switched from an engine to a motor. Motors are easily a new source of noise for two reasons:
1. under the condition of non-sinusoidal power supply, a motor has high-frequency electromagnetic force components, electromagnetic noise is easily formed, and complex reverberation is formed in a cab through radiation and structural propagation;
2. the electric automobile pursues lightweight and high power density, the motor mass and rigidity are reduced, and the frame, the rear axle and the like are lighter than the traditional automobile, so that large vibration response is easier to be excited.
Although the vibration sources of the two automobiles are different, the vibration transmission mode and the dynamic mechanism are the same, so that how to reduce the noise and the vibration of the electric automobile and how to shield the high-frequency noise of the motor is a great problem in the design process of the electric automobile.
The conventional sound insulation material for the electric automobile is an EVA (ethylene vinyl acetate) single-layer material for sound insulation, the gram weight of the EVA material is more than 3000 g/square meter, and a better sound insulation effect can be achieved only by generally requiring more than 3mm, and the weight of a single piece is too heavy, so that the self weight of the electric automobile is increased, and the cruising burden of a battery is increased; the common sound-absorbing material for the electric automobile is 10mm in gram weight of 400 g/square meter, the sound-absorbing effect is not ideal, and the NVH performance of the electric automobile is poor.
Disclosure of Invention
The present invention is directed to solving at least one of the problems of the prior art. Therefore, the invention provides the front wall sound insulation pad suitable for the electric automobile, and the NVH performance of the electric automobile is improved.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows: enclose acoustic celotex pad before automobile body, including first sound absorbing layer, range upon range of second sound absorbing layer on first sound absorbing layer, range upon range of first acoustic celotex layer on the second sound absorbing layer, range upon range of second acoustic celotex layer on first acoustic celotex layer and range upon range of third acoustic celotex layer on the second acoustic celotex layer.
The first sound insulation layer is made of PE.
The second sound insulation layer is made of PP.
The third sound insulation layer is made of PET.
The thickness of the third soundproof layer is smaller than the thickness of the second soundproof layer and larger than the thickness of the first soundproof layer.
The thickness of third puigging is 1.8 ~ 2.2mm, the thickness of second puigging is 2.3 ~ 2.7mm, the thickness of first puigging is 0.4 ~ 0.6 mm.
The thickness of third puigging is 2.0mm, the thickness of second puigging is 2.5mm, the thickness of first puigging is 0.5 mm.
The first sound absorption layer is made of sound absorption cotton, and the second sound absorption layer is made of felt.
The thickness of the second sound absorption layer is 14-16 mm, and the thickness of the first sound absorption layer is 9-11 mm.
The invention also provides an electric automobile which comprises the automobile body front wall sound insulation pad.
The front wall sound insulation pad for the vehicle body adopts a multi-layer sound insulation material and sound absorption material structure, so that the noise generated by a driving motor in the driving process of the electric vehicle can be effectively reduced, the NVH (noise, vibration and harshness) performance of the electric vehicle is improved, the noise generated in the driving process of the vehicle is reduced, and the comfort experience of passengers is improved.
Drawings
FIG. 1 is a schematic view of the assembly of the body cowl acoustic mat of the present invention with a vehicle body;
FIG. 2 is an enlarged view at A in FIG. 1;
the labels in the above figures are: 1. a front baffle of the vehicle body; 2. a third sound insulating layer; 3. a second sound insulating layer; 4. a first sound insulating layer; 5. a second sound absorbing layer; 6. a first sound absorbing layer.
Detailed Description
The following detailed description of the embodiments of the present invention will be given with reference to the accompanying drawings for a purpose of helping those skilled in the art to more fully, accurately and deeply understand the concept and technical solution of the present invention and to facilitate its implementation.
It should be noted that, in the following embodiments, the terms "first", "second" and "third" do not denote absolute differences in structure and/or function, nor do they denote a sequential order of execution, but rather are used for convenience of description.
As shown in fig. 1 and 2, the present invention provides a sound insulating mat for a vehicle body cowl suitable for an electric vehicle, including a first sound absorbing layer 6, a second sound absorbing layer 5 laminated on the first sound absorbing layer 6, a first sound insulating layer 4 laminated on the second sound absorbing layer 5, a second sound insulating layer 3 laminated on the first sound insulating layer 4, and a third sound insulating layer 2 laminated on the second sound insulating layer 3.
Specifically, as shown in fig. 1 and 2, the third sound-insulating layer 2 is fixedly connected to the dash panel 1, the third sound-insulating layer 2 faces the cab of the vehicle, the dash panel 1 is positioned between the third sound-insulating layer 2 and the cab of the electric vehicle, and the first sound-absorbing layer 6 faces the engine compartment. In the driving process of the electric automobile, high-frequency noise generated by the driving motor is absorbed by the sound-absorbing material, and then low-frequency noise is isolated by the sound-insulating material.
The principle of sound insulation and absorption is as follows:
1. sound insulation material: materials that can be used to block noise are collectively referred to as sound insulation materials. In a strict sense, almost all materials have a sound-insulating effect, and the difference is that the sound volume of the intervals of different materials is different. The sound insulation amount of the same material is greatly changed due to different areal densities. The sound insulation quantity follows the principle of mass law, namely, the larger the unit dense area density of the sound insulation material is, the larger the sound insulation quantity is, and the area density and the sound insulation quantity are in direct proportion.
2. The sound absorbing material is a sound absorbing material, sound is originated from vibration of an object, the sound absorbing material causes the vibration of adjacent air to form sound waves, and the sound waves propagate to the periphery in an air medium. When sound is transmitted to the surface of the member material, a portion of the sound energy is reflected, a portion penetrates the material, and a portion of the sound energy is converted to heat energy by friction with the surrounding medium due to vibration of the member material or the sound propagating therein, and the sound energy is lost, i.e., the sound is absorbed by the material. The silencing material is mostly a loose and porous material, the silencing mechanism is that sound waves go deep into pores of the material, the pores are mostly open pores which are communicated with each other inside, and the sound energy is converted into heat energy by air molecule friction and viscous resistance and by mechanical vibration of fine fibers. The silencing coefficient of the porous silencing material generally increases from low frequency to high frequency, so that the porous silencing material has good silencing effect on high-frequency and medium-frequency sound.
Preferably, the first sound-insulating layer 4 is made of PE (polyethylene), the second sound-insulating layer 3 is made of PP (polypropylene), and the third sound-insulating layer 2 is made of PET (polyethylene terephthalate). The thickness of third puigging 2 is less than the thickness of second puigging 3, and the thickness of third puigging 2 is greater than the thickness of first puigging 4, with the double-deck acoustic material stack reinforcing syllable-dividing effect of PP + PE, and the gram weight requirement to the individual layer material reduces moreover, and corresponding weight reduces to some extent, is favorable to realizing electric automobile's lightweight.
The thickness of the third sound-proof layer 2 is 1.8-2.2 mm, the thickness of the second sound-proof layer 3 is 2.3-2.7 mm, and the thickness of the first sound-proof layer 4 is 0.4-0.6 mm. Preferably, the thickness of the third sound-insulating layer 2 is 2.0mm, the thickness of the second sound-insulating layer 3 is 2.5mm, the thickness of the first sound-insulating layer 4 is 0.5mm, the grammage of the third sound-insulating layer 2 is 650 g/square meter, the grammage of the second sound-insulating layer 3 is 1200 g/square meter, and the grammage of the first sound-insulating layer 4 is 150 g/square meter. The third puigging is used for isolated low frequency noise, and the isolated high frequency noise of second puigging mainly used, and first puigging plays supplementary syllable-dividing effect, considers compound technology, and PE material self decomposes under the high temperature condition and produces the adhesion and felt and PP material can compound completely, so place first puigging in the middle of second puigging and the felt. Due to the limited arrangement space, the total thickness needs to be controlled to be about 5mm, and the thickness of the material and the gram weight are in a corresponding relation according to the product characteristics, and the larger the gram weight is, the larger the thickness is. Considering the electric vehicle field, the probability of high-frequency sound is large, and the thickness of the PP material is larger than that of the PET material.
As shown in fig. 1 and 2, the first sound absorbing layer 6, the second sound absorbing layer 5, the first sound insulating layer 4, the second sound insulating layer 3, and the third sound insulating layer 2 are arranged in this order, and preferably, the first sound absorbing layer 6 is made of sound absorbing cotton, the second sound absorbing layer 5 is made of felt, and the sound absorbing effect is enhanced by superimposing the felt and the sound absorbing cotton double-layer sound absorbing material.
The thickness of the second sound absorption layer 5 is 14-16 mm, and the thickness of the first sound absorption layer 6 is 9-11 mm. Preferably, the thickness of the second sound absorbing layer 5 is 15mm, the thickness of the first sound absorbing layer 6 is 10mm, the grammage of the second sound absorbing layer 5 is 750 g/square meter, and the grammage of the first sound absorbing layer 6 is 400 g/square meter. The felt is used for adsorbing high-frequency noise, the sound-absorbing cotton is used for adsorbing low-frequency noise, the arrangement space is limited, the total thickness needs to be controlled to be about 30mm, the thickness of the material and the gram weight are in a corresponding relation according to the product characteristics, and the larger the gram weight is, the larger the thickness is. Considering the electric motor car field, the probability that high frequency sound appears is big, inhales the sound cotton relatively, requires felt thickness to be a little bit.
When carrying out the preparation of sound insulating pad, adopt current mould pressing technology to make up first sound-absorbing layer 6, second sound-absorbing layer 5, first sound-insulating layer 4, second sound-insulating layer 3 and third sound-insulating layer 2 together, the sound-absorbing layer is pressed close to the engine compartment sound-insulating layer during the assembly after, earlier with sound-absorbing material absorption high frequency noise, the isolated low frequency noise of reuse sound-insulating material.
The invention also provides an electric automobile which comprises the automobile body front wall sound insulation pad with the structure. The specific structure of the front wall sound insulation pad of the vehicle body can refer to fig. 1 and 2, and is not described in detail herein. Since the electric vehicle of the present invention includes the cowl sound insulating mat in the above embodiment, it has all the advantages of the cowl sound insulating mat described above.
The invention has been described above with reference to the accompanying drawings, it is obvious that the invention is not limited to the specific implementation in the above-described manner, and it is within the scope of the invention to apply the inventive concept and solution to other applications without substantial modification.
Claims (5)
1. Enclose before the automobile body and give sound insulation and fill up its characterized in that: the sound insulation structure comprises a first sound absorption layer, a second sound absorption layer laminated on the first sound absorption layer, a first sound insulation layer laminated on the second sound absorption layer, a second sound insulation layer laminated on the first sound insulation layer and a third sound insulation layer laminated on the second sound insulation layer;
the third sound insulation layer is fixedly connected with the front baffle of the automobile body, the third sound insulation layer faces the direction of the automobile cab, the front baffle of the automobile body is positioned between the third sound insulation layer and the cab of the electric automobile, and the first sound absorption layer faces the engine compartment; in the running process of the electric automobile, high-frequency noise generated by the driving motor is absorbed by the sound-absorbing material, and then low-frequency noise is isolated by the sound-insulating material;
the sound insulation structure comprises a first sound absorption layer, a second sound absorption layer, a first sound insulation layer, a second sound insulation layer and a third sound insulation layer which are sequentially arranged, wherein the first sound insulation layer is made of PE (polyethylene), the second sound insulation layer is made of PP (polypropylene), the third sound insulation layer is made of PET (polyethylene terephthalate), the thickness of the third sound insulation layer is smaller than that of the second sound insulation layer, the thickness of the third sound insulation layer is larger than that of the first sound insulation layer, the first sound absorption layer is made of sound absorption cotton, and the second sound absorption layer is made of felt; the third sound insulation layer is used for isolating low-frequency noise, the second sound insulation layer is used for isolating high-frequency noise, and the first sound insulation layer plays a role in assisting sound insulation;
the thickness of the third sound insulation layer is 1.8-2.0 mm, the thickness of the second sound insulation layer is 2.3-2.5 mm, the thickness of the first sound insulation layer is 0.4-0.5 mm, the thickness of the second sound absorption layer is 14-16 mm, the thickness of the first sound absorption layer is 9-11 mm, the gram weight of the third sound insulation layer is 650 g/square meter, the gram weight of the second sound insulation layer is 1200 g/square meter, and the gram weight of the first sound insulation layer is 150 g/square meter;
when the sound insulation pad is manufactured, the first sound absorption layer, the second sound absorption layer, the first sound insulation layer, the second sound insulation layer and the third sound insulation layer are combined together by adopting the existing mould pressing process.
2. The acoustic insulator mat for vehicle body cowl according to claim 1, characterized in that: the thickness of third puigging is 2.0mm, the thickness of second puigging is 2.5mm, the thickness of first puigging is 0.5 mm.
3. The acoustic insulator mat for vehicle bodies according to claim 1 or 2, characterized in that: the thickness of the second sound absorption layer is 15mm, and the thickness of the first sound absorption layer is 10 mm.
4. The acoustic insulator mat for vehicle body cowl according to claim 3, characterized in that: the gram weight of the second sound absorbing layer is 750 grams per square meter, and the gram weight of the first sound absorbing layer is 400 grams per square meter.
5. Electric automobile, its characterized in that: comprising the acoustic insulator mat for a front wall of a vehicle body according to any one of claims 1 to 4.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910504542.5A CN110154935B (en) | 2019-06-12 | 2019-06-12 | Enclose before automobile body and give sound insulation and fill up and have its electric automobile |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910504542.5A CN110154935B (en) | 2019-06-12 | 2019-06-12 | Enclose before automobile body and give sound insulation and fill up and have its electric automobile |
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| Publication Number | Publication Date |
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| CN110154935A CN110154935A (en) | 2019-08-23 |
| CN110154935B true CN110154935B (en) | 2021-06-01 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113246554A (en) * | 2021-06-23 | 2021-08-13 | 智己汽车科技有限公司 | Sound absorption and insulation material with multilayer composite structure |
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| CN204978478U (en) * | 2015-06-18 | 2016-01-20 | 重庆佩尔哲汽车内饰系统有限公司 | Wallboard gives sound insulation and fills up before automobile |
| CN206475833U (en) * | 2016-12-22 | 2017-09-08 | 重庆佩尔哲汽车内饰系统有限公司 | A kind of sound insulating pad of front wall board of automobile |
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2019
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|---|---|---|---|---|
| US5554830A (en) * | 1990-07-19 | 1996-09-10 | Matec Holding Ag | Noise-reducing covering for vehicle interior |
| CN1511092A (en) * | 2001-05-22 | 2004-07-07 | �����ɷ� | Sound absorptive protective mat |
| CN201646596U (en) * | 2009-12-16 | 2010-11-24 | 浙江吉利汽车研究院有限公司 | A kind of car front wall sound insulation pad |
| CN102792366A (en) * | 2010-03-09 | 2012-11-21 | 欧拓管理公司 | Automotive insulating trim part |
| CN201736923U (en) * | 2010-06-23 | 2011-02-09 | 浙江吉利汽车研究院有限公司 | Automotive front wall sound insulation pad |
| CN105034971A (en) * | 2014-04-23 | 2015-11-11 | 现代自动车株式会社 | Dash pad for vehicle |
| CN106113841A (en) * | 2016-08-15 | 2016-11-16 | 昆山同昌汽车新材料有限公司 | A kind of sound insulation automobile front wall |
| CN109130340A (en) * | 2018-07-20 | 2019-01-04 | 无锡吉兴汽车声学部件科技有限公司 | A kind of absorbing sound and lowering noise decorative panel and its preparation method and application |
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| CN110154935A (en) | 2019-08-23 |
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