CN106427817A - Sound-insulating cushion of automobile front wall - Google Patents
Sound-insulating cushion of automobile front wall Download PDFInfo
- Publication number
- CN106427817A CN106427817A CN201611060669.5A CN201611060669A CN106427817A CN 106427817 A CN106427817 A CN 106427817A CN 201611060669 A CN201611060669 A CN 201611060669A CN 106427817 A CN106427817 A CN 106427817A
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- China
- Prior art keywords
- layer
- sound
- sound absorbing
- absorbing layer
- front wall
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
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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
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- Physics & Mathematics (AREA)
- Acoustics & Sound (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Soundproofing, Sound Blocking, And Sound Damping (AREA)
- Vehicle Interior And Exterior Ornaments, Soundproofing, And Insulation (AREA)
Abstract
The invention discloses a sound-insulating cushion of an automobile front wall. The sound-insulating cushion comprises an outer sound-absorbing layer, a reflecting layer, a shock absorption layer and an inner sound-absorbing layer, wherein the reflecting layer is arranged on the inner side of the outer sound-absorbing layer so that part of noise can be reflected back to the outer sound-insulating layer; the shock absorption layer is arranged on the inner side of the reflecting layer and used for reducing vibration of the reflecting layer; the inner sound-insulating layer is arranged on the inner side of the shock absorption layer so as to further absorb the noise. The sound-insulating cushion of the automobile front wall has a good sound-insulating effect, and is low in density and weight, fireproof, not prone to combustion and mildewing, resistant to corrosion and free of volatile gas.
Description
Technical field
The present invention relates to technical field of vehicle, particularly to a kind of automobile dash board sound insulating pad.
Background technology
Come into huge numbers of families with automobile, to automotive needs more and more higher, driving noise also slowly obtains user and closes client
Note.Automobile dash board sound insulating pad in correlation technique has that quality is big, volatility is high, odor profiles difference, easily mouldy and sound-absorbing
Performance not comprehensively the shortcomings of.
Content of the invention
It is contemplated that at least solving one of technical problem in correlation technique to a certain extent.For this reason, the present invention carries
Go out a kind of automobile front wall sound-isolation pad, this automobile front wall sound-isolation pad has good soundproof effect, and density is low, lightweight, fire prevention
Nonflammable, be not easy mouldy, corrosion-resistant, non-volatility gas.
According to the automobile front wall sound-isolation pad of the present invention, including：Outer sound absorbing layer；Reflecting layer, described reflecting layer is arranged on described
The inner side of outer sound absorbing layer is to be reflected back described outer sound absorbing layer by partial noise；Damping layer, described damping layer is arranged on described reflection
The inner side of layer and the vibration for reducing described reflecting layer；And interior sound absorbing layer, described interior sound absorbing layer is arranged on described damping layer
Inner side with further absorption of noise.
According to the automobile front wall sound-isolation pad of the present invention, by setting gradually outer sound absorbing layer from inside to outside, reflecting layer, vibration damping
Layer and interior sound absorbing layer are so that automobile front wall sound-isolation pad can have good soundproof effect, and density is low, lightweight, and fire prevention is not
Easy firing, it is not easy mouldy, corrosion-resistant, non-volatility gas.
In addition, the technical characteristic adding as follows can also be had according to the automobile front wall sound-isolation pad of the present invention：
According to one embodiment of present invention, described outer sound absorbing layer is metal foaming layer, and described reflecting layer is metallic reflection
Layer.
According to one embodiment of present invention, described outer sound absorbing layer is aluminum foaming layer.
According to one embodiment of present invention, described reflecting layer is aluminium sheet.
According to one embodiment of present invention, the thickness of described outer sound absorbing layer is t1, and described t1 meets：3mm≤t1≤
5mm.
According to one embodiment of present invention, the thickness in described reflecting layer is t2, and described t2 meets：0.5mm≤t2≤
2mm.
According to one embodiment of present invention, described damping layer and described interior sound absorbing layer are aerosil layer,
And the density of described damping layer is more than the density of described interior sound absorbing layer.
According to one embodiment of present invention, described interior sound absorbing layer has loose structure.
According to one embodiment of present invention, the thickness of described damping layer is t3, and described t3 meets：2mm≤t3≤3mm.
According to one embodiment of present invention, the thickness of described interior sound absorbing layer is t4, and described t4 meets：t4≥20mm.
The additional aspect of the present invention and advantage will be set forth in part in the description, and partly will become from the following description
Obtain substantially, or recognized by the practice of the present invention.
Brief description
The above-mentioned and/or additional aspect of the present invention and advantage will become from reference to the description to embodiment for the accompanying drawings below
Substantially and easy to understand, wherein：
Fig. 1 is the comparison diagram of new material according to embodiments of the present invention and traditional material performance.
Fig. 2 is the schematic diagram of automobile front wall sound-isolation pad according to embodiments of the present invention；
Fig. 3 is the sectional view of automobile front wall sound-isolation pad according to embodiments of the present invention；
Fig. 4 is the Making programme figure of automobile front wall sound-isolation pad according to embodiments of the present invention.
Reference：Automobile front wall sound-isolation pad 100, outer sound absorbing layer 110, reflecting layer 120, damping layer 130, interior sound absorbing layer
140.
Specific embodiment
Embodiments of the invention are described below in detail, the example of described embodiment is shown in the drawings.Below with reference to
The embodiment of Description of Drawings is exemplary it is intended to be used for explaining the present invention, and is not considered as limiting the invention.
In describing the invention it is to be understood that term " " center ", " longitudinal ", " horizontal ", " length ", " width ",
" thickness ", " on ", D score, "front", "rear", "left", "right", " vertical ", " level ", " top ", " bottom " " interior ", " outward ", " up time
The orientation of instruction such as pin ", " counterclockwise ", " axial ", " radially ", " circumferential " or position relationship be based on orientation shown in the drawings or
Position relationship, is for only for ease of the description present invention and simplifies description, rather than the device of instruction or hint indication or element must
Must have specific orientation, with specific azimuth configuration and operation, be therefore not considered as limiting the invention.
Additionally, term " first ", " second " are only used for describing purpose, and it is not intended that indicating or hint relative importance
Or the implicit quantity indicating indicated technical characteristic.Thus, define " first ", the feature of " second " can express or
Implicitly include at least one this feature.In describing the invention, " multiple " are meant that at least two, such as two, three
Individual etc., unless otherwise expressly limited specifically.
In the present invention, unless otherwise clearly defined and limited, term " installation ", " being connected ", " connection ", " fixation " etc.
Term should be interpreted broadly, for example, it may be being fixedly connected or being detachably connected or integral；Can be that machinery connects
Connect or electrically connect or can communicate each other；Can be to be joined directly together it is also possible to be indirectly connected to by intermediary, permissible
It is the connection of two element internals or the interaction relationship of two elements, limit unless otherwise clear and definite.For this area
For those of ordinary skill, above-mentioned term concrete meaning in the present invention can be understood as the case may be.
Adopting acoustical cotton traditional front wall sound-isolation pad and fire wall, ethylene-vinyl acetate copolymer, felt, chemistry are handed over more
Connection polyethylene foam-material, polyurethanes or glass fibre etc. are made, and before this kind, wall sound-isolation pad and fire wall generally there are
Quality is big, volatility is high, odor profiles difference, easily mouldy and attracting performance not comprehensively the shortcomings of.
Additionally, the solvent of traditional expanded material all contains benezene material, lead to product volatility high, when different materials are carried out
Mixed using glue when compound, lead to content of formaldehyde in product higher, and traditional expanded material porosity is not high, in leading to
The sound-absorbing effect of low frequency noise is not enough.
For this reason, the present invention proposes a kind of new automobile front wall sound-isolation pad, this new automobile front wall sound-isolation pad can have
Effect solves deficiency and the defect that traditional material exists.
With reference to Fig. 1 to Fig. 4, the automobile front wall sound-isolation pad 100 of the embodiment of the present invention is described in detail.
Automobile front wall sound-isolation pad 100 according to embodiments of the present invention can include outer sound absorbing layer 110, reflecting layer 120, vibration damping
Layer 130 and interior sound absorbing layer 140.
Wherein, as shown in Figures 2 and 3, outer sound absorbing layer 110, reflecting layer 120, damping layer 130 and interior sound absorbing layer 140 are from extroversion
Inside set gradually, outer sound absorbing layer 110 tentatively can reduce noise, outer sound absorbing layer 110 is loose structure, and then noise can spread out
Penetrate and reflect to reduce the purpose of noise.
Reflecting layer 120 is arranged in the inner side of outer sound absorbing layer 110 so that partial noise is reflected back outer sound absorbing layer 110, outer sound-absorbing
Layer 110 can not possibly necessarily have partial noise and pass through outer sound absorbing layer 110, reflecting layer 120 can be by portion fully by noise absorption
Divide the noise through outer sound absorbing layer 110 to be reflected back outer sound absorbing layer 110, so that outer sound absorbing layer 110 again this partial noise is spread out
Penetrate and reflect, to reduce noise further.
Damping layer 130 is arranged on the inner side in reflecting layer 120 and the vibration for reducing reflecting layer 120, and partial noise is passed through
After the reflection in reflecting layer 120, reflecting layer 120 can be made to vibrate, and damping layer 130 is close to reflecting layer 120 setting and can be had
Effect reduces the vibration in reflecting layer 120.
Interior sound absorbing layer 140 is arranged on the inner side of damping layer 130 with further absorption of noise, and noise is through absorbing layer by layer and anti-
Penetrate, still suffer from partial noise and enter into interior sound absorbing layer 140, interior sound absorbing layer 140 can absorb this partial noise further.
The operation principle of automobile front wall sound-isolation pad 100 is briefly described below.
Noise first passes through outer sound absorbing layer 110, can effectively reduce noise through the absorption of outer sound absorbing layer 110, partly make an uproar
Sound passes through outer sound absorbing layer 110 to reach reflecting layer 120, through the outer sound absorbing layer 110 that reflects back in reflecting layer 120, continues by outer suction
Sound-absorbing layer 110 absorbs；
Also can vibrate while the transmitting noise of reflecting layer 120, damping layer 130 laminating reflecting layer 120 setting can have
Effect reduces the vibration in reflecting layer 120；
Through absorption layer by layer and reflection, partial noise is still had to enter into interior sound absorbing layer 140, interior sound absorbing layer 140 can enter one
Step absorbs noise.
Automobile front wall sound-isolation pad 100 according to embodiments of the present invention, by setting gradually outer sound absorbing layer from inside to outside
110th, reflecting layer 120, damping layer 130 and interior sound absorbing layer 140 are so that automobile front wall sound-isolation pad 100 can have good sound insulation
Effect, and density is low, lightweight, fire prevention is nonflammable, be not easy mouldy, corrosion-resistant, non-volatility gas.
In some embodiments of the invention, outer sound absorbing layer 110 is metal foaming layer, and reflecting layer 120 is metallic reflection plate.
Specifically, outer sound absorbing layer 110 is aluminum foamed board, and reflecting layer 120 is aluminium sheet.Aluminum metal foaming easily and intensity high,
Density is little, significantly reduces the weight in outer sound absorbing layer 110 and reflecting layer 120.
Further, the thickness of outer sound absorbing layer 110 is t1, and described t1 meets：3mm≤t1≤5mm.Preferably, t1=
3mm.The thickness of the outer sound absorbing layer 110 of the embodiment of the present invention meets above range, can be maximum while ensureing sound-absorbing effect
Raw material is saved on degree ground.
Further, the thickness in reflecting layer 120 is t2, and described t2 meets：0.5mm≤t2≤2mm.Preferably, reflect
The thickness of layer 120 is 0.5mm.
In some embodiments of the invention, damping layer 130 and interior sound absorbing layer 140 are aerosil layer, and
The density of damping layer 130 is more than the density of interior sound absorbing layer 140.
Damping layer 130 is made using aerosil, the damping effect of damping layer 130 can be greatly improved it is ensured that
The Oscillation Amplitude of reflecting plate is farthest reduced.
Further, interior sound absorbing layer 140 has loose structure, thus to not absorbed by outer sound absorbing layer 110 and can reflect
The noise of layer 120 reflection is absorbed, and further increases the soundproof effect of automobile front wall sound-isolation pad 100.
Further, the thickness of damping layer 130 is t3, and described t3 meets：2mm≤t3≤3mm.Preferably, damping layer
130 thickness t3=2mm.
The thickness of interior sound absorbing layer 140 is t4, and described t4 meets：t4≥20mm.Preferably, t4=20mm.Interior sound absorbing layer 140
Thickness thicker, its attract effect better, but only thickness in 20mm about when, could guarantee sound-absorbing effect preferably with
When, at utmost reduce the utilization rate of raw material.
The outer sound absorbing layer 110 of the embodiment of the present invention and reflecting layer 120 are alumiaum article, and damping layer 130 and interior sound absorbing layer 140 are
Aerosil part.Fig. 1 is the new material of the present invention and the performance comparison of traditional material.
The processing technology of the automobile front wall sound-isolation pad 100 of the embodiment of the present invention is briefly described with reference to Fig. 4.
Outer sound absorbing layer 110 and the preparation in reflecting layer 120：In order to ensure not produce between outer sound absorbing layer 110 and reflecting layer 120
The foaming of exciting, therefore metallic aluminium and metallic aluminium must pass through high pressure and be combined with each other.First press by aluminium powder with titantium hydride during production
Ratio mixing, is then compound to metallic aluminum surface by High Temperature High Pressure.
Damping layer 130 and the preparation of interior sound absorbing layer 140：Damping layer 130 is high density aerosil and porous type
The composite bed of aerosil, both complete double-component by supercritical drying simultaneously and are combined.By ethanol and silicon during production
Acetoacetic ester is allocated uniformly in proportion, is then mixed and made into solution with water.Two kinds of differences are obtained by the ratio adjusting ethanol close
Degree and the solution of porosity, then make solution gelatinizing by losing alcohol polycondensation reaction, after gel are layered the aeroge of different densities
Overlay on metallic aluminium, enter horizontal high voltage lyophilization simultaneously.Complete the making of metallic aluminium and aerogel composite.
Finally, according to actually used demand, by composite compacting and be cut into the automobile front wall of various overall dimensions every
Sound pad 100.
By way of laminated freezing is dried, produce many components aerosil that different structure is composited,
Many components aeroge is used for the aspects such as auto sound (can be fabricated to multiple composite beds of different densities, porosity, elasticity), with
Meet the demand absorbing different frequency noise.
By freezing high pressure, foaming metal aluminum and many components aeroge are combined, reach different materials and be combined.This composite square
Method is not required to add binding agent, can effectively reduce VOC and the volatile flavor of product.
In the description of this specification, reference term " embodiment ", " some embodiments ", " example ", " specifically show
The description of example " or " some examples " etc. means specific features, structure, material or the spy describing with reference to this embodiment or example
Point is contained at least one embodiment or the example of the present invention.In this manual, to the schematic representation of above-mentioned term not
Identical embodiment or example must be directed to.And, the specific features of description, structure, material or feature can be in office
Combine in an appropriate manner in one or more embodiments or example.Additionally, in the case of not conflicting, the skill of this area
The feature of the different embodiments described in this specification or example and different embodiment or example can be tied by art personnel
Close and combine.
Although embodiments of the invention have been shown and described above it is to be understood that above-described embodiment is example
Property it is impossible to be interpreted as limitation of the present invention, those of ordinary skill in the art within the scope of the invention can be to above-mentioned
Embodiment is changed, changes, replacing and modification.
Claims (10)
1. a kind of automobile front wall sound-isolation pad is it is characterised in that include：
Outer sound absorbing layer；
Reflecting layer, described reflecting layer is arranged on the inner side of described outer sound absorbing layer so that partial noise is reflected back described outer sound absorbing layer；
Damping layer, described damping layer is arranged on the inner side in described reflecting layer and the vibration for reducing described reflecting layer；And
Interior sound absorbing layer, described interior sound absorbing layer is arranged on the inner side of described damping layer with further absorption of noise.
2. automobile front wall sound-isolation pad according to claim 1 it is characterised in that described outer sound absorbing layer be metal foaming layer,
Described reflecting layer is metallic reflector.
3. automobile front wall sound-isolation pad according to claim 2 is it is characterised in that described outer sound absorbing layer is aluminum foaming layer.
4. automobile front wall sound-isolation pad according to claim 2 is it is characterised in that described reflecting layer is aluminium sheet.
5. automobile front wall sound-isolation pad according to claim 3 it is characterised in that described outer sound absorbing layer thickness be t1, institute
State t1 to meet：3mm≤t1≤5mm.
6. automobile front wall sound-isolation pad according to claim 4 is it is characterised in that the thickness in described reflecting layer is t2, described
T2 meets：0.5mm≤t2≤2mm.
7. automobile front wall sound-isolation pad according to claim 1 is it is characterised in that described damping layer and described interior sound absorbing layer are equal
For aerosil layer, and the density of described damping layer is more than the density of described interior sound absorbing layer.
8. automobile front wall sound-isolation pad according to claim 7 is it is characterised in that described interior sound absorbing layer has loose structure.
9. automobile front wall sound-isolation pad according to claim 7 is it is characterised in that the thickness of described damping layer is t3, described
T3 meets：2mm≤t3≤3mm.
10. automobile front wall sound-isolation pad according to claim 7 it is characterised in that described interior sound absorbing layer thickness be t4, institute
State t4 to meet：t4≥20mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611060669.5A CN106427817A (en) | 2016-11-25 | 2016-11-25 | Sound-insulating cushion of automobile front wall |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611060669.5A CN106427817A (en) | 2016-11-25 | 2016-11-25 | Sound-insulating cushion of automobile front wall |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN106427817A true CN106427817A (en) | 2017-02-22 |
Family
ID=58218911
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201611060669.5A Pending CN106427817A (en) | 2016-11-25 | 2016-11-25 | Sound-insulating cushion of automobile front wall |
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| Country | Link |
|---|---|
| CN (1) | CN106427817A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107521432A (en) * | 2017-08-23 | 2017-12-29 | 柳州市日海汽配有限责任公司 | Automotive trim sound insulating member |
| CN113669178A (en) * | 2021-07-22 | 2021-11-19 | 一汽解放汽车有限公司 | Automobile-used air intake system and car |
| CN113682004A (en) * | 2021-09-29 | 2021-11-23 | 无锡吉兴汽车部件有限公司 | Lightweight sound insulation pad and preparation method and application thereof |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63235665A (en) * | 1987-03-24 | 1988-09-30 | Nippon Denso Co Ltd | Ignition distributor for internal combustion engine |
| CN202038253U (en) * | 2010-11-08 | 2011-11-16 | 浙江吉利汽车研究院有限公司 | Automobile front wall sound-isolation pad |
| CN202428736U (en) * | 2011-12-28 | 2012-09-12 | 上海新安汽车隔音毡有限公司 | Lamellar sound insulation heat insulation pad used in engine cabin |
| CN102966410A (en) * | 2011-09-01 | 2013-03-13 | 现代自动车株式会社 | Muffler for an exhaust system of vehicle |
| CN204622744U (en) * | 2015-04-30 | 2015-09-09 | 广德天运新技术股份有限公司 | Wall sound-isolation pad before a kind of automobile cab of heat insulation silencing and damping |
| CN204712540U (en) * | 2015-06-15 | 2015-10-21 | 四川科宁泰科技有限公司 | A kind of heat insulation felt pan |
| CN105802484A (en) * | 2014-09-22 | 2016-07-27 | 现代自动车株式会社 | Engine radiation noise reduction structure |
-
2016
- 2016-11-25 CN CN201611060669.5A patent/CN106427817A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63235665A (en) * | 1987-03-24 | 1988-09-30 | Nippon Denso Co Ltd | Ignition distributor for internal combustion engine |
| CN202038253U (en) * | 2010-11-08 | 2011-11-16 | 浙江吉利汽车研究院有限公司 | Automobile front wall sound-isolation pad |
| CN102966410A (en) * | 2011-09-01 | 2013-03-13 | 现代自动车株式会社 | Muffler for an exhaust system of vehicle |
| CN202428736U (en) * | 2011-12-28 | 2012-09-12 | 上海新安汽车隔音毡有限公司 | Lamellar sound insulation heat insulation pad used in engine cabin |
| CN105802484A (en) * | 2014-09-22 | 2016-07-27 | 现代自动车株式会社 | Engine radiation noise reduction structure |
| CN204622744U (en) * | 2015-04-30 | 2015-09-09 | 广德天运新技术股份有限公司 | Wall sound-isolation pad before a kind of automobile cab of heat insulation silencing and damping |
| CN204712540U (en) * | 2015-06-15 | 2015-10-21 | 四川科宁泰科技有限公司 | A kind of heat insulation felt pan |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107521432A (en) * | 2017-08-23 | 2017-12-29 | 柳州市日海汽配有限责任公司 | Automotive trim sound insulating member |
| CN113669178A (en) * | 2021-07-22 | 2021-11-19 | 一汽解放汽车有限公司 | Automobile-used air intake system and car |
| CN113669178B (en) * | 2021-07-22 | 2023-02-17 | 一汽解放汽车有限公司 | Automobile-used air intake system and car |
| CN113682004A (en) * | 2021-09-29 | 2021-11-23 | 无锡吉兴汽车部件有限公司 | Lightweight sound insulation pad and preparation method and application thereof |
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Application publication date: 20170222 |
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