US20120279799A1 - Sound-absorbing shielding element - Google Patents
Sound-absorbing shielding element Download PDFInfo
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- US20120279799A1 US20120279799A1 US13/289,665 US201113289665A US2012279799A1 US 20120279799 A1 US20120279799 A1 US 20120279799A1 US 201113289665 A US201113289665 A US 201113289665A US 2012279799 A1 US2012279799 A1 US 2012279799A1
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- Prior art keywords
- approximately
- microperforated sheet
- shielding element
- microperforated
- sheet
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Classifications
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- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
- G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
- G10K11/16—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
- G10K11/162—Selection of materials
- G10K11/168—Plural layers of different materials, e.g. sandwiches
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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
- B32B15/00—Layered products comprising a layer of metal
- B32B15/20—Layered products comprising a layer of metal comprising aluminium or copper
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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
- B32B3/00—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar form; Layered products having particular features of form
- B32B3/26—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar form; Layered products having particular features of form characterised by a particular shape of the outline of the cross-section of a continuous layer; characterised by a layer with cavities or internal voids ; characterised by an apertured layer
- B32B3/266—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar form; Layered products having particular features of form characterised by a particular shape of the outline of the cross-section of a continuous layer; characterised by a layer with cavities or internal voids ; characterised by an apertured layer characterised by an apertured layer, the apertures going through the whole thickness of the layer, e.g. expanded metal, perforated layer, slit layer regular cells B32B3/12
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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
- B60R13/0838—Insulating elements, e.g. for sound insulation for engine compartments
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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
- B32B2307/00—Properties of the layers or laminate
- B32B2307/10—Properties of the layers or laminate having particular acoustical properties
- B32B2307/102—Insulating
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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
- B32B2605/00—Vehicles
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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
- B60R13/0876—Insulating elements, e.g. for sound insulation for mounting around heat sources, e.g. exhaust pipes
Definitions
- the invention relates to sound-absorbing shielding elements. More specifically the invention relates to sound-absorbing shielding elements for fitting into a motor vehicle. Such shielding elements generally have a layered construction.
- a sound-absorbing shielding element according to the invention is used in particular in a motor vehicle in order at least to reduce the propagation of sound, which is caused by a source of sound, for example by the exhaust systems in the engine compartment, into the passenger compartment.
- Various elements which are acoustically effective, i.e. act as sound absorbers are known.
- sound absorbers consisting of porous materials, such as foams or nonwoven materials, are known.
- microperforated sheets for example microperforated aluminium foils, are acoustically effective and can serve as sound absorbers.
- Microperforated sheets of this type have a very small thickness in the submillimetre range and have a perforation with holes, the individual diameters of which likewise lie in the submillimetre range, and which have a hole area ratio of less than 10% or even less than 1%.
- the hole area ratio is understood as meaning the ratio of the entire area of the holes in a surface region with respect to the area of this surface region of the sheet.
- Sound-absorbing shielding elements which consist of a combination of porous materials, such as foams or nonwoven materials, and microperforated sheets, are also known, such as those known from DE 10 2004 050 649 A1.
- the sound-absorbing shielding element known from DE 10 2004 050 649 A1 has, in the following order: a support plate, a microperforated sheet, an acoustically effective porous absorber layer and a further microperforated sheet.
- This known sound-absorbing shielding element is intended, firstly, to be effective as a heat shield, in order to shield the passenger compartment from the heat arising in the engine compartment, and, secondly, is intended to have sound-absorbing properties, wherein the shielding element is intended to be able to optimally absorb sound over a broad acoustic frequency band.
- the invention is therefore based on the object of further improving a sound-absorbing shielding element in respect of the sound-absorbing properties thereof.
- a sound-absorbing shielding element comprising a layered construction having a support plate, an acoustically effective porous absorber layer having a first side and a second side opposite the first side, an acoustically effective first microperforated sheet arranged on the first side of the absorber layer, an acoustically effective second microperforated sheet arranged on the first side of the absorber layer.
- the layered construction is selected in such a manner that at least two microperforated sheets are arranged on at least one side of the absorber layer, i.e. on that side of the absorber layer which faces the support plate and/or on that side of the absorber layer which faces away from the support plate. It has turned out in this case that, by means of the arrangement of at least two microperforated sheets on one and the same side of the porous absorber layer, the sound-absorbing properties of the shielding element are significantly improved in relation to the known shielding element which has only one microperforated sheet on both sides of the absorber layer.
- the support plate can preferably be provided with a macroperforation with holes which have a diameter of several millimetres, for example approximately 5 mm.
- the porous absorber layer of the sound-absorbing shielding element according to the invention can be, for example, a fibrous material or a sponge-like foam, in particular a melamine foam.
- the thickness of the porous absorber layer can be matched to the need and the particular requirements of the fitting situation in a motor vehicle.
- microperforated sheets which are arranged on the same side of the absorber layer can be microperforated sheets such as are already known for sound absorption purposes.
- first microperforated sheet and the second microperforated sheet are immediately adjacent.
- the two microperforated sheets rest directly on each other without one or more further layers being arranged therebetween.
- This arrangement has proven particularly effectively acoustically with regard to the sound absorption in the sound-absorbing shielding element according to the invention.
- first microperforated sheet and second microperforated sheet is immediately adjacent to the absorber layer.
- the sequence of layers, as seen from the absorber layer is therefore: porous absorber layer—second microperforated sheet—first microperforated sheet.
- a third microperforated sheet is arranged on the second side of the absorber layer, which side faces away from the first side of the absorber layer.
- the sound-absorbing shielding element according to the invention therefore has at least three microperforated sheets, of which two are arranged on one side of the absorber layer and the at least one third is arranged on the other side of the absorber layer.
- the sound-absorbing shielding element according to the invention it is, of course, possible for at least two microperforated sheets to be arranged on both sides of the absorber layer.
- the first side of the absorber layer is that side of the absorber layer which faces away from the support plate.
- the support plate is arranged facing the source of sound, for example the exhaust system in the engine compartment of the motor vehicle.
- the following sequence of layers of the layered construction of the sound-absorbing shielding element according to the invention is preferred: the support plate, optionally the third microperforated layer, the absorber layer, the second microperforated sheet and the first microperforated sheet.
- the first microperforated sheet, which forms the top sheet is a heat sealing sheet.
- “Sealing sheet” means that the second microperforated sheet can be joined to the support plate, for example in the edge region, by hot adhesive bonding or hot melt adhesive bonding.
- the second microperforated sheet and, if present, the third microperforated sheet are preferably also a heat sealing sheet.
- the first side of the absorber layer is that side of the absorber layer which faces the support plate, and therefore the at least two microperforated sheets are arranged on that side of the absorber layer which faces the support plate.
- the first microperforated sheet and/or the second microperforated sheet and/or optionally the third mircroperforated sheet has a thickness within a range of approximately 20 ⁇ m to approximately 150 ⁇ m, preferably within a range of approximately 20 ⁇ m to approximately 100 ⁇ m, furthermore preferably within a range of approximately 20 ⁇ m to approximately 80 ⁇ m, and furthermore preferably within a range of approximately 40 ⁇ m to approximately 60 ⁇ m.
- the first microperforated sheet and the second microperforated sheet and also the third microperforated sheet each have a thickness of approximately 50 ⁇ m.
- the thicknesses of the first microperforated sheet, of the second microperforated sheet and optionally of the third microperforated sheet can be identical to one another but may also vary from sheet to sheet within the stated ranges.
- the first microperforated sheet and/or the second microperforated sheet has a perforation with holes which have an individual diameter within a range of approximately 50 ⁇ m to approximately 200 ⁇ m, preferably within a range of approximately 50 ⁇ m to approximately 150 ⁇ m, furthermore preferably within a range of approximately 60 ⁇ m to approximately 120 ⁇ m, and furthermore preferably within a range of approximately 80 ⁇ m to approximately 100 ⁇ m.
- the first microperforated sheet and/or the second microperforated sheet each have/has a perforation with holes which have an individual diameter of 90 ⁇ m.
- the individual diameters of the holes in the perforations in the sheets may be identical or different within the same sheet and/or may be identical or different from the first microperforated sheet to the second microperforated sheet.
- the latter has a perforation with holes which have an individual diameter within the range of approximately 50 ⁇ m to approximately 200 ⁇ m, preferably within the range of approximately 50 ⁇ m to approximately 150 ⁇ m, furthermore preferably within the range of approximately 60 ⁇ m to approximately 140 ⁇ m, and furthermore preferably within the range of approximately 80 ⁇ m to approximately 130 ⁇ m.
- the third microperforated sheet has a perforation with holes which have an individual diameter of 110 ⁇ m.
- the respective holes have a surface covering within a range of approximately 20 to approximately 80 holes per cm 2 , preferably within a range of approximately 30 to approximately 70 holes per cm 2 , and furthermore preferably within a range of approximately 40 to approximately 60 holes per cm 2 .
- the surface covering of the holes in all three abovementioned microperforated sheets is 52 holes per cm 2 .
- the surface covering of the holes may be different among the sheets.
- microperforated sheets provided in the sound-absorbing shielding element according to the invention are preferably manufactured from aluminium.
- a sound-absorbing shielding element comprising a layered construction having a support plate, an acoustically effective porous absorber layer, an acoustically effective first microperforated sheet arranged on the first side of the absorber layer, an acoustically effective second microperforated sheet arranged between the absorber layer and the first microperforated sheet, and an acoustically effectice third microperforated sheet arranged between the support plate and the absorber layer.
- the second microperforated sheet preferably is immediately adjacent to the first microperforated sheet and to the absorber layer.
- the first microperforated sheet preferably is a heat sealing sheet made of aluminium.
- FIG. 1 shows an exemplary embodiment of a sound-absorbing shielding element in an arrangement between a source of sound and a motor vehicle body part, wherein the individual layers of the layered construction of the shielding element are illustrated in section and, for the sake of clarity, separately from one another; and
- FIG. 2 shows an edge region of the shielding element, wherein the individual layers of the sound-shielding element are illustrated in an assembly with one another.
- FIGS. 1 and 2 illustrate a sound-absorbing shielding element provided with the general reference number 10 .
- FIG. 1 shows the shielding element 10 in a central region
- FIG. 2 shows the shielding element 10 in an edge region.
- the shielding element 10 is preferably used in a motor vehicle.
- the shielding element 10 serves to prevent sound which is produced by a source of sound 12 , for example the exhaust system in the engine compartment of the motor vehicle, from propagating into a passenger compartment 14 of the motor vehicle, or to at least greatly damp the sound produced by the source of sound 12 .
- the shielding element 10 is correspondingly arranged between the source of sound 12 and a body part 16 to which the passenger compartment 14 is connected.
- the shielding element 10 has a layered construction which has a support plate 18 , an acoustically effective porous absorber layer 20 , a first microperforated sheet 22 , a second microperforated sheet 24 and a third microperforated sheet 26 .
- the shielding element 10 consists exclusively of the abovementioned components 18 , 20 , 22 , 24 and 26 .
- the support plate 18 faces the source of sound 12
- the second microperforated sheet 24 faces away from the source of sound 12 .
- the first microperforated sheet 22 and the second microperforated sheet 24 are arranged on a first side 28 of the absorber layer 20 , wherein the first side 28 faces away from the support plate 18 .
- the first microperforated sheet 22 and the second microperforated sheet 24 are directly adjacent to each other (also see FIG. 2 ), and the arrangement consisting of the first microperforated sheet 22 and the second microperforated sheet 24 , for its part, is directly adjacent to the absorber layer 20 .
- the third microperforated sheet 26 is arranged on a second side 30 of the absorber layer 20 , wherein the second side 30 faces the support plate 18 .
- the third microperforated sheet 26 is directly adjacent both to the absorber layer 20 and to the support plate 18 .
- the second microperforated sheet 24 it is also possible for the second microperforated sheet 24 to be arranged between the third microperforated sheet 26 and the absorber layer 20 such that two microperforated sheets are arranged on the second side 30 of the absorber layer 20 .
- microperforated sheet 26 it is likewise conceivable for the third microperforated sheet 26 to be omitted, and therefore two microperforated sheets are arranged only on the side 28 of the absorber layer 20 .
- the support plate 18 is manufactured from metal and has a thickness D 1 of a few mm or approximately 1 mm.
- the support plate may be provided with knobs in the edge region 18 a while the support plate 18 may be embossed in the region in which it overlaps with the absorber layer 20 .
- the support plate 18 has a macroperforation with holes 32 which have an individual diameter D 2 of approximately 5 mm.
- the support plate 18 can be manufactured in particular from aluminium.
- the absorber layer 20 is constructed from a porous material, for example from a sponge-like foam.
- the absorber layer 20 can be manufactured in particular from melamine foam.
- the absorber layer 20 has a thickness D 3 which can be within the range of several mm, for example approximately 5 mm.
- the absorber layer 20 may also be manufactured from a fibrous material, for example a nonwoven, wherein the choice of material and the thickness D 3 of the absorber layer 20 are selected in accordance with the requirements of the fitting situation.
- the first microperforated sheet 22 is manufactured from a metal sheet, for example aluminium foil.
- the first microperforated sheet 22 has a thickness D 4 which lies within a range of approximately 20 ⁇ m to approximately 150 ⁇ m, preferably within a range of approximately 20 ⁇ m to approximately 100 ⁇ m, furthermore preferably within a range of approximately 20 ⁇ m to approximately 80 ⁇ m, and furthermore preferably within a range of approximately 40 ⁇ m to approximately 60 ⁇ m.
- the first microperforated sheet 22 has a perforation with holes 34 which have an individual diameter D 5 within the range of approximately 50 ⁇ m to 200 ⁇ m, preferably within a range of approximately 50 ⁇ m to approximately 150 ⁇ m, furthermore preferably within a range of approximately 60 ⁇ m to approximately 120 ⁇ m, and furthermore preferably within a range of approximately 80 ⁇ m to approximately 100 ⁇ m.
- the holes 34 in the microperforated sheet 22 may be circular or may have a shape differing therefrom.
- the first microperforated sheet 22 has a thickness D 4 of 50 ⁇ m, and the holes 34 have an individual diameter of 90 ⁇ m.
- the microperforation of the first microperforated sheet 22 has a surface covering of the holes within a range of approximately 20 to approximately 80 holes per cm 2 , preferably within a range of approximately 30 to approximately 70 holes per cm 2 , and furthermore preferably within a range of approximately 40 to approximately 60 holes per cm 2 .
- the surface covering of the holes 34 in the perforation in the microperforated sheet 22 is 52 holes per cm 2 .
- the second microperforated sheet 24 has a perforation with holes 36
- the third microporated sheet 26 has a perforation with holes 38 .
- the thickness D 6 of the second microperforated sheet 24 lies within the abovementioned parameter ranges for the thickness D 4 of the microperforated sheet 22 .
- the thickness D 6 may be identical to the thickness D 4 or differ therefrom.
- the thickness D 7 of the third microperforated sheet 26 likewise lies within the abovementioned parameter ranges for the thickness D 4 .
- the thickness D 6 is 50 ⁇ m
- the thickness D 7 is likewise 50 ⁇ m.
- the holes 36 in the perforation in the second microperforated sheet 24 have an individual diameter which lies within the abovementioned parameter ranges of the individual diameters of the holes 34 in the perforation in the first microperforated sheet 22 .
- the surface covering of the holes 36 in the perforation in the second microperforated sheet 24 likewise lies within the abovementioned parameter ranges for the surface covering of the holes 34 in the perforation of the first microperforated sheet 22 .
- the individual diameter of the holes 36 in the perforation in the second microperforated sheet 24 is 90 ⁇ m with a surface covering of 52 holes per cm 2 .
- the surface covering and the individual diameters of the holes 36 in the perforation in the second microperforated sheet 24 may be identical to or differ from the corresponding sizes of the holes 34 in the perforation in the first microperforated sheet 22 .
- the holes 38 in the perforation in the third microperforated sheet 26 have an individual diameter within a range of approximately 50 ⁇ m to approximately 200 ⁇ m, preferably within a range of approximately 50 ⁇ m to approximately 150 ⁇ m, furthermore preferably within a range of approximately 60 ⁇ m to approximately 140 ⁇ m, and furthermore preferably within a range of approximately 80 ⁇ m to approximately 130 ⁇ m.
- the holes 38 have an individual diameter of 110 ⁇ m.
- the holes 38 it is also possible for the holes 38 to have the same individual diameters as the holes 34 and/or the holes 36 .
- the surface covering of the holes 38 lies within the above-mentioned parameter ranges for the surface covering of the holes 34 in the perforation in the first microperforated sheet 22 .
- the surface covering of the holes 38 is 52 holes per cm 2 .
- the absorber layer 20 and the first microperforated sheet 22 do not extend into the edge region 18 a of the support plate 18 .
- the support plate 18 preferably has the holes 32 only in the overlapping region with the absorber layer 20 .
- the first microperforated sheet 22 which forms the top sheet in the layered construction of the shielding element 10 , is a heat sealing sheet which is adhesively bonded to the support plate 18 in the edge region 18 a by means of a metal hot melt adhesive.
- the outer edge 18 b of the support plate 18 is crimped around the end 22 a of the first microperforated sheet 22 .
- the second microperforated sheet 24 and/or the third microperforated sheet 26 are likewise heat sealing sheets, if the need arises, when an intimate assembly of the components of the shielding 10 is expedient.
- the third microperforated sheet 26 is mounted with the edge 26 a thereof between the second microperforated sheet 24 and the support plate 18 .
- the sound-absorbing shielding element 10 has particularly good sound absorption properties over the relevant frequency range of the sound caused by the source of sound 12 , specifically owing to the fact that there are two microperforated sheets, such as here the first microperforated sheet 22 and the second microperforated sheet 24 , on at least one side of the absorber layer 20 .
Abstract
A sound-absorbing shielding element, in particular for fitting into a motor vehicle, comprises a layered construction which has a support plate, an acoustically effective porous absorber layer and at least one acoustically effective first microperforated sheet which is arranged on a first side of the absorber layer. An acoustically effective second microperforated sheet is arranged on the first side of the absorber layer.
Description
- This application claims priority from
German patent application 10 2010 051 583.3 filed on Nov. 5, 2010. The entire contents of these priority application are incorporated herein by reference. - The invention relates to sound-absorbing shielding elements. More specifically the invention relates to sound-absorbing shielding elements for fitting into a motor vehicle. Such shielding elements generally have a layered construction.
- A sound-absorbing shielding element according to the invention is used in particular in a motor vehicle in order at least to reduce the propagation of sound, which is caused by a source of sound, for example by the exhaust systems in the engine compartment, into the passenger compartment. Various elements which are acoustically effective, i.e. act as sound absorbers, are known. For example, sound absorbers consisting of porous materials, such as foams or nonwoven materials, are known. Furthermore, it is also known that microperforated sheets, for example microperforated aluminium foils, are acoustically effective and can serve as sound absorbers.
- Microperforated sheets of this type have a very small thickness in the submillimetre range and have a perforation with holes, the individual diameters of which likewise lie in the submillimetre range, and which have a hole area ratio of less than 10% or even less than 1%. In this case, the hole area ratio is understood as meaning the ratio of the entire area of the holes in a surface region with respect to the area of this surface region of the sheet.
- Sound-absorbing shielding elements which consist of a combination of porous materials, such as foams or nonwoven materials, and microperforated sheets, are also known, such as those known from DE 10 2004 050 649 A1.
- According to one exemplary embodiment, the sound-absorbing shielding element known from DE 10 2004 050 649 A1 has, in the following order: a support plate, a microperforated sheet, an acoustically effective porous absorber layer and a further microperforated sheet.
- This known sound-absorbing shielding element is intended, firstly, to be effective as a heat shield, in order to shield the passenger compartment from the heat arising in the engine compartment, and, secondly, is intended to have sound-absorbing properties, wherein the shielding element is intended to be able to optimally absorb sound over a broad acoustic frequency band.
- However, it has been shown in practice that specifically the sound-absorbing properties of said known sound-absorbing shielding element are not optimum over wide acoustic frequency ranges.
- The invention is therefore based on the object of further improving a sound-absorbing shielding element in respect of the sound-absorbing properties thereof.
- According to an aspect, a sound-absorbing shielding element is provided, comprising a layered construction having a support plate, an acoustically effective porous absorber layer having a first side and a second side opposite the first side, an acoustically effective first microperforated sheet arranged on the first side of the absorber layer, an acoustically effective second microperforated sheet arranged on the first side of the absorber layer.
- Thus, in the sound-absorbing shielding element, the layered construction is selected in such a manner that at least two microperforated sheets are arranged on at least one side of the absorber layer, i.e. on that side of the absorber layer which faces the support plate and/or on that side of the absorber layer which faces away from the support plate. It has turned out in this case that, by means of the arrangement of at least two microperforated sheets on one and the same side of the porous absorber layer, the sound-absorbing properties of the shielding element are significantly improved in relation to the known shielding element which has only one microperforated sheet on both sides of the absorber layer.
- In the shielding element according to the invention, the support plate can preferably be provided with a macroperforation with holes which have a diameter of several millimetres, for example approximately 5 mm.
- The porous absorber layer of the sound-absorbing shielding element according to the invention can be, for example, a fibrous material or a sponge-like foam, in particular a melamine foam. The thickness of the porous absorber layer can be matched to the need and the particular requirements of the fitting situation in a motor vehicle.
- The two abovementioned microperforated sheets which are arranged on the same side of the absorber layer can be microperforated sheets such as are already known for sound absorption purposes.
- In a preferred refinement, the first microperforated sheet and the second microperforated sheet are immediately adjacent.
- In this refinement, the two microperforated sheets rest directly on each other without one or more further layers being arranged therebetween. This arrangement has proven particularly effectively acoustically with regard to the sound absorption in the sound-absorbing shielding element according to the invention.
- It is likewise furthermore preferred if the arrangement consisting of the first microperforated sheet and second microperforated sheet is immediately adjacent to the absorber layer.
- In this refinement, the sequence of layers, as seen from the absorber layer, is therefore: porous absorber layer—second microperforated sheet—first microperforated sheet. This refinement has proven particularly advantageous in conjunction with the previously mentioned refinement with regard to the sound-absorbing properties of the sound-absorbing shielding element according to the invention.
- An even further improvement of the sound-absorbing properties of the sound-absorbing shielding element according to the invention can be achieved in that a third microperforated sheet is arranged on the second side of the absorber layer, which side faces away from the first side of the absorber layer.
- In this refinement, the sound-absorbing shielding element according to the invention therefore has at least three microperforated sheets, of which two are arranged on one side of the absorber layer and the at least one third is arranged on the other side of the absorber layer. Within the context of the invention, it is, of course, possible for at least two microperforated sheets to be arranged on both sides of the absorber layer.
- In a further preferred refinement, the first side of the absorber layer is that side of the absorber layer which faces away from the support plate.
- This refinement is advantageous in particular if, in the fitting situation of the sound-absorbing shielding element, the support plate is arranged facing the source of sound, for example the exhaust system in the engine compartment of the motor vehicle.
- In conjunction with the previously mentioned refinement, the following sequence of layers of the layered construction of the sound-absorbing shielding element according to the invention is preferred: the support plate, optionally the third microperforated layer, the absorber layer, the second microperforated sheet and the first microperforated sheet.
- In this context, it is furthermore preferred if the first microperforated sheet, which forms the top sheet, is a heat sealing sheet.
- “Sealing sheet” means that the second microperforated sheet can be joined to the support plate, for example in the edge region, by hot adhesive bonding or hot melt adhesive bonding.
- The second microperforated sheet and, if present, the third microperforated sheet are preferably also a heat sealing sheet.
- In an alternative to the refinement of the at least two microperforated sheets being arranged on that side of the absorber layer which faces away from the support plate, it is also possible for the first side of the absorber layer to be that side of the absorber layer which faces the support plate, and therefore the at least two microperforated sheets are arranged on that side of the absorber layer which faces the support plate.
- In a further preferred refinement, the first microperforated sheet and/or the second microperforated sheet and/or optionally the third mircroperforated sheet has a thickness within a range of approximately 20 μm to approximately 150 μm, preferably within a range of approximately 20 μm to approximately 100 μm, furthermore preferably within a range of approximately 20 μm to approximately 80 μm, and furthermore preferably within a range of approximately 40 μm to approximately 60 μm.
- In a preferred refinement, the first microperforated sheet and the second microperforated sheet and also the third microperforated sheet each have a thickness of approximately 50 μm.
- It goes without saying that the thicknesses of the first microperforated sheet, of the second microperforated sheet and optionally of the third microperforated sheet can be identical to one another but may also vary from sheet to sheet within the stated ranges.
- In further preferred refinements, the first microperforated sheet and/or the second microperforated sheet has a perforation with holes which have an individual diameter within a range of approximately 50 μm to approximately 200 μm, preferably within a range of approximately 50 μm to approximately 150 μm, furthermore preferably within a range of approximately 60 μm to approximately 120 μm, and furthermore preferably within a range of approximately 80 μm to approximately 100 μm.
- It goes without saying that the holes do not inevitably have to be circular, and therefore individual diameter is understood as meaning the largest dimension of the holes.
- In a preferred refinement, the first microperforated sheet and/or the second microperforated sheet each have/has a perforation with holes which have an individual diameter of 90 μm.
- It furthermore goes without saying that the individual diameters of the holes in the perforations in the sheets may be identical or different within the same sheet and/or may be identical or different from the first microperforated sheet to the second microperforated sheet.
- In another preferred refinement in conjunction with the refinement of the third microperforated sheet being provided, the latter has a perforation with holes which have an individual diameter within the range of approximately 50 μm to approximately 200 μm, preferably within the range of approximately 50 μm to approximately 150 μm, furthermore preferably within the range of approximately 60 μm to approximately 140 μm, and furthermore preferably within the range of approximately 80 μm to approximately 130 μm.
- In a preferred refinement, the third microperforated sheet has a perforation with holes which have an individual diameter of 110 μm.
- With regard to the hole area ratio, it is preferred in the first microperforated sheet and/or the second microperforated sheet and/or optionally the third microperforated sheet if the respective holes have a surface covering within a range of approximately 20 to approximately 80 holes per cm2, preferably within a range of approximately 30 to approximately 70 holes per cm2, and furthermore preferably within a range of approximately 40 to approximately 60 holes per cm2.
- In a preferred refinement, the surface covering of the holes in all three abovementioned microperforated sheets is 52 holes per cm2.
- It goes without saying that the surface covering of the holes may be different among the sheets.
- The microperforated sheets provided in the sound-absorbing shielding element according to the invention are preferably manufactured from aluminium.
- According to another aspect, a sound-absorbing shielding element is provided, comprising a layered construction having a support plate, an acoustically effective porous absorber layer, an acoustically effective first microperforated sheet arranged on the first side of the absorber layer, an acoustically effective second microperforated sheet arranged between the absorber layer and the first microperforated sheet, and an acoustically effectice third microperforated sheet arranged between the support plate and the absorber layer.
- The second microperforated sheet preferably is immediately adjacent to the first microperforated sheet and to the absorber layer.
- The first microperforated sheet preferably is a heat sealing sheet made of aluminium.
- Further features and advantages emerge from the description below and the attached drawing.
- It goes without saying that the features mentioned above and those which have yet to be explained below can be used not only in the respectively stated combination but also in different combinations or on their own without departing from the scope of the present invention.
- An exemplary embodiment of the invention is illustrated in the drawing and is described in more detail hereinbelow with reference thereto. In the drawing:
-
FIG. 1 shows an exemplary embodiment of a sound-absorbing shielding element in an arrangement between a source of sound and a motor vehicle body part, wherein the individual layers of the layered construction of the shielding element are illustrated in section and, for the sake of clarity, separately from one another; and -
FIG. 2 shows an edge region of the shielding element, wherein the individual layers of the sound-shielding element are illustrated in an assembly with one another. -
FIGS. 1 and 2 illustrate a sound-absorbing shielding element provided with thegeneral reference number 10.FIG. 1 shows the shieldingelement 10 in a central region, andFIG. 2 shows the shieldingelement 10 in an edge region. - The shielding
element 10 is preferably used in a motor vehicle. In a motor vehicle, the shieldingelement 10 serves to prevent sound which is produced by a source ofsound 12, for example the exhaust system in the engine compartment of the motor vehicle, from propagating into apassenger compartment 14 of the motor vehicle, or to at least greatly damp the sound produced by the source ofsound 12. The shieldingelement 10 is correspondingly arranged between the source ofsound 12 and abody part 16 to which thepassenger compartment 14 is connected. - The shielding
element 10 has a layered construction which has asupport plate 18, an acoustically effectiveporous absorber layer 20, afirst microperforated sheet 22, asecond microperforated sheet 24 and athird microperforated sheet 26. - In the exemplary embodiment shown, the shielding
element 10 consists exclusively of theabovementioned components - In the shown fitted position of the shielding
element 10, thesupport plate 18 faces the source ofsound 12, and thesecond microperforated sheet 24 faces away from the source ofsound 12. - The
first microperforated sheet 22 and thesecond microperforated sheet 24 are arranged on afirst side 28 of theabsorber layer 20, wherein thefirst side 28 faces away from thesupport plate 18. Thefirst microperforated sheet 22 and thesecond microperforated sheet 24 are directly adjacent to each other (also seeFIG. 2 ), and the arrangement consisting of thefirst microperforated sheet 22 and thesecond microperforated sheet 24, for its part, is directly adjacent to theabsorber layer 20. - The
third microperforated sheet 26 is arranged on asecond side 30 of theabsorber layer 20, wherein thesecond side 30 faces thesupport plate 18. Thethird microperforated sheet 26 is directly adjacent both to theabsorber layer 20 and to thesupport plate 18. - In an alternative refinement, it is also possible for the
second microperforated sheet 24 to be arranged between thethird microperforated sheet 26 and theabsorber layer 20 such that two microperforated sheets are arranged on thesecond side 30 of theabsorber layer 20. - It is likewise conceivable for the
third microperforated sheet 26 to be omitted, and therefore two microperforated sheets are arranged only on theside 28 of theabsorber layer 20. - The
support plate 18 is manufactured from metal and has a thickness D1 of a few mm or approximately 1 mm. The support plate may be provided with knobs in theedge region 18 a while thesupport plate 18 may be embossed in the region in which it overlaps with theabsorber layer 20. - The
support plate 18 has a macroperforation withholes 32 which have an individual diameter D2 of approximately 5 mm. - The
support plate 18 can be manufactured in particular from aluminium. - The
absorber layer 20 is constructed from a porous material, for example from a sponge-like foam. Theabsorber layer 20 can be manufactured in particular from melamine foam. Theabsorber layer 20 has a thickness D3 which can be within the range of several mm, for example approximately 5 mm. Theabsorber layer 20 may also be manufactured from a fibrous material, for example a nonwoven, wherein the choice of material and the thickness D3 of theabsorber layer 20 are selected in accordance with the requirements of the fitting situation. - The
first microperforated sheet 22 is manufactured from a metal sheet, for example aluminium foil. Thefirst microperforated sheet 22 has a thickness D4 which lies within a range of approximately 20 μm to approximately 150 μm, preferably within a range of approximately 20 μm to approximately 100 μm, furthermore preferably within a range of approximately 20 μm to approximately 80 μm, and furthermore preferably within a range of approximately 40 μm to approximately 60 μm. - The
first microperforated sheet 22 has a perforation withholes 34 which have an individual diameter D5 within the range of approximately 50 μm to 200 μm, preferably within a range of approximately 50 μm to approximately 150 μm, furthermore preferably within a range of approximately 60 μm to approximately 120 μm, and furthermore preferably within a range of approximately 80 μm to approximately 100 μm. - The
holes 34 in themicroperforated sheet 22 may be circular or may have a shape differing therefrom. - In a practical application, the
first microperforated sheet 22 has a thickness D4 of 50 μm, and theholes 34 have an individual diameter of 90 μm. - The microperforation of the
first microperforated sheet 22 has a surface covering of the holes within a range of approximately 20 to approximately 80 holes per cm2, preferably within a range of approximately 30 to approximately 70 holes per cm2, and furthermore preferably within a range of approximately 40 to approximately 60 holes per cm2. - In a practical application, the surface covering of the
holes 34 in the perforation in themicroperforated sheet 22 is 52 holes per cm2. - The
second microperforated sheet 24 has a perforation withholes 36, and thethird microporated sheet 26 has a perforation with holes 38. - The thickness D6 of the
second microperforated sheet 24 lies within the abovementioned parameter ranges for the thickness D4 of themicroperforated sheet 22. The thickness D6 may be identical to the thickness D4 or differ therefrom. - The thickness D7 of the
third microperforated sheet 26 likewise lies within the abovementioned parameter ranges for the thickness D4. - In a practical application, the thickness D6 is 50 μm, and the thickness D7 is likewise 50 μm.
- The
holes 36 in the perforation in thesecond microperforated sheet 24 have an individual diameter which lies within the abovementioned parameter ranges of the individual diameters of theholes 34 in the perforation in thefirst microperforated sheet 22. - The surface covering of the
holes 36 in the perforation in thesecond microperforated sheet 24 likewise lies within the abovementioned parameter ranges for the surface covering of theholes 34 in the perforation of thefirst microperforated sheet 22. - In a practical application, the individual diameter of the
holes 36 in the perforation in thesecond microperforated sheet 24 is 90 μm with a surface covering of 52 holes per cm2. - The surface covering and the individual diameters of the
holes 36 in the perforation in thesecond microperforated sheet 24 may be identical to or differ from the corresponding sizes of theholes 34 in the perforation in thefirst microperforated sheet 22. - The
holes 38 in the perforation in thethird microperforated sheet 26 have an individual diameter within a range of approximately 50 μm to approximately 200 μm, preferably within a range of approximately 50 μm to approximately 150 μm, furthermore preferably within a range of approximately 60 μm to approximately 140 μm, and furthermore preferably within a range of approximately 80 μm to approximately 130 μm. - In a practical application, the
holes 38 have an individual diameter of 110 μm. - However, it is also possible for the
holes 38 to have the same individual diameters as theholes 34 and/or theholes 36. - The surface covering of the
holes 38 lies within the above-mentioned parameter ranges for the surface covering of theholes 34 in the perforation in thefirst microperforated sheet 22. - In a practical application, the surface covering of the
holes 38 is 52 holes per cm2. - As illustrated in
FIG. 2 , theabsorber layer 20 and thefirst microperforated sheet 22 do not extend into theedge region 18 a of thesupport plate 18. - The
support plate 18 preferably has theholes 32 only in the overlapping region with theabsorber layer 20. - The
first microperforated sheet 22, which forms the top sheet in the layered construction of the shieldingelement 10, is a heat sealing sheet which is adhesively bonded to thesupport plate 18 in theedge region 18 a by means of a metal hot melt adhesive. For this purpose, theouter edge 18 b of thesupport plate 18 is crimped around theend 22 a of thefirst microperforated sheet 22. - The
second microperforated sheet 24 and/or thethird microperforated sheet 26 are likewise heat sealing sheets, if the need arises, when an intimate assembly of the components of the shielding 10 is expedient. - The
third microperforated sheet 26 is mounted with theedge 26 a thereof between thesecond microperforated sheet 24 and thesupport plate 18. - The sound-absorbing
shielding element 10 according to the previously described exemplary embodiment has particularly good sound absorption properties over the relevant frequency range of the sound caused by the source ofsound 12, specifically owing to the fact that there are two microperforated sheets, such as here thefirst microperforated sheet 22 and thesecond microperforated sheet 24, on at least one side of theabsorber layer 20.
Claims (24)
1. A sound-absorbing shielding element, comprising
a layered construction having:
a support plate,
an acoustically effective porous absorber layer having a first side and a second side opposite the first side,
an acoustically effective first microperforated sheet arranged on the first side of the absorber layer,
an acoustically effective second microperforated sheet arranged on the first side of the absorber layer.
2. The shielding element of claim 1 , wherein the first microperforated sheet and the second microperforated sheet are immediately adjacent to one another.
3. The shielding element of claim 2 , wherein the second microperforated sheet is immediately adjacent to the absorber layer.
4. The shielding element of claim 1 , wherein the layered construction further has a third microperforated sheet arranged on the second side of the absorber layer.
5. The shielding element of claim 1 , wherein the first side of the absorber layer faces away from the support plate.
6. The shielding element of claim 1 , wherein the first microperforated sheet is a heat sealing sheet.
7. The shielding element of claim 4 , comprising a sequence of layers in the following order: the support plate, the third microperforated sheet, the absorber layer, the second microperforated sheet and the first microperforated sheet.
8. The shielding element of claim 7 , wherein the first microperforated sheet is a heat sealing sheet.
9. The shielding element of claim 1 , wherein the first side of the absorber layer faces the support plate.
10. The shielding element of claim 1 , wherein the first microperforated sheet has a thickness within a range of approximately 20 μm to approximately 150 μm.
11. The shielding element of claim 1 , wherein the first microperforated sheet has a thickness within a range of approximately 40 μm to approximately 60 μm.
12. The shielding element of claim 1 , wherein the second microperforated sheet has a thickness within a range of approximately 20 μm to approximately 150 μm.
13. The shielding element of claim 1 , wherein the second microperforated sheet has a thickness within a range of approximately 40 μm to approximately 60 μm.
14. The shielding element of claim 1 , wherein the first microperforated sheet has a perforation with holes which have an individual diameter within a range of approximately 50 μm to approximately 200 μm.
15. The shielding element of claim 1 , wherein the first microperforated sheet has a perforation with holes which have an individual diameter within a range of approximately 80 μm to approximately 100 μm.
16. The shielding element of claim 1 , wherein the second microperforated sheet has a perforation with holes which have an individual diameter within a range of approximately 50 μm to approximately 200 μm.
17. The shielding element of claim 1 , wherein the second microperforated sheet has a perforation with holes which have an individual diameter within a range of approximately 80 μm to approximately 100 μm.
18. The shielding element of claim 1 , wherein the first microperforated sheet has a perforation with holes which have a surface covering within a range of approximately 20 to approximately 80 holes per cm2.
19. The shielding element of claim 1 , wherein the first microperforated sheet has a perforation with holes which have a surface covering within a range of 40 to approximately 60 holes per cm2.
20. The shielding element of claim 1 , wherein the second microperforated sheet has a perforation with holes which have a surface covering within a range of approximately 20 to approximately 80 holes per cm2.
21. The shielding element of claim 1 , wherein the second microperforated sheet has a perforation with holes which have a surface covering within a range of 40 to approximately 60 holes per cm2.
22. A sound-absorbing shielding element, comprising
a layered construction having:
a support plate,
an acoustically effective porous absorber layer,
an acoustically effective first microperforated sheet arranged on the first side of the absorber layer,
an acoustically effective second microperforated sheet arranged between the absorber layer and the first microperforated sheet, and
an acoustically effectice third microperforated sheet arranged between the support plate and the absorber layer.
23. The shielding element of claim 22 , wherein the second microperforated sheet is immediately adjacent to the first microperforated sheet and to the absorber layer.
24. The shielding element of claim 23 , wherein the first microperforated sheet is a heat sealing sheet made of aluminium.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102010051583.3 | 2010-11-05 | ||
DE102010051583A DE102010051583A1 (en) | 2010-11-05 | 2010-11-05 | Sound-absorbing shield element used in motor vehicle e.g. car, has acoustic effect micro-perforated films that are arranged on portion of porous absorbing layer |
Publications (1)
Publication Number | Publication Date |
---|---|
US20120279799A1 true US20120279799A1 (en) | 2012-11-08 |
Family
ID=45971172
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US13/289,665 Abandoned US20120279799A1 (en) | 2010-11-05 | 2011-11-04 | Sound-absorbing shielding element |
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US (1) | US20120279799A1 (en) |
DE (1) | DE102010051583A1 (en) |
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US20110100749A1 (en) * | 2008-05-22 | 2011-05-05 | 3M Innovative Properties Company | Multilayer sound absorbing structure comprising mesh layer |
US20140246268A1 (en) * | 2012-07-12 | 2014-09-04 | Howa Textile Industry Co., Ltd. | Soundproof body and insulator for motor vehicles |
CN105788587A (en) * | 2014-12-24 | 2016-07-20 | 北京市劳动保护科学研究所 | Porous composite sound absorption structure |
US20160355148A1 (en) * | 2015-05-08 | 2016-12-08 | Yazaki Corporation | SOUNDPROOF MATERIAL FOR VEHICLE and WIRE-HARNESS ASSEMBLY |
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US20220366887A1 (en) * | 2019-09-03 | 2022-11-17 | 3M Innovative Properties Company | Assembly including acoustic baffles |
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DE112014002785T5 (en) * | 2013-06-11 | 2016-03-10 | Reinz-Dichtungs-Gmbh | heat shield |
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Owner name: PROGRESS-WERK OBERKIRCH AG, GERMANY Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:GRAF, JOERG;REEL/FRAME:027572/0720 Effective date: 20111104 |
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