CA2638295A1 - Heat shield - Google Patents
Heat shield Download PDFInfo
- Publication number
- CA2638295A1 CA2638295A1 CA002638295A CA2638295A CA2638295A1 CA 2638295 A1 CA2638295 A1 CA 2638295A1 CA 002638295 A CA002638295 A CA 002638295A CA 2638295 A CA2638295 A CA 2638295A CA 2638295 A1 CA2638295 A1 CA 2638295A1
- Authority
- CA
- Canada
- Prior art keywords
- heat shield
- metal layer
- shield according
- area
- embossments
- Prior art date
- 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.)
- Abandoned
Links
- 229910052751 metal Inorganic materials 0.000 claims abstract description 81
- 239000002184 metal Substances 0.000 claims abstract description 81
- 238000009826 distribution Methods 0.000 claims description 8
- 238000009413 insulation Methods 0.000 abstract description 8
- NMFHJNAPXOMSRX-PUPDPRJKSA-N [(1r)-3-(3,4-dimethoxyphenyl)-1-[3-(2-morpholin-4-ylethoxy)phenyl]propyl] (2s)-1-[(2s)-2-(3,4,5-trimethoxyphenyl)butanoyl]piperidine-2-carboxylate Chemical compound C([C@@H](OC(=O)[C@@H]1CCCCN1C(=O)[C@@H](CC)C=1C=C(OC)C(OC)=C(OC)C=1)C=1C=C(OCCN2CCOCC2)C=CC=1)CC1=CC=C(OC)C(OC)=C1 NMFHJNAPXOMSRX-PUPDPRJKSA-N 0.000 description 8
- 229910000831 Steel Inorganic materials 0.000 description 7
- 239000010959 steel Substances 0.000 description 7
- 238000010521 absorption reaction Methods 0.000 description 4
- 238000005336 cracking Methods 0.000 description 3
- 239000004744 fabric Substances 0.000 description 3
- 239000000835 fiber Substances 0.000 description 3
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
- 239000006096 absorbing agent Substances 0.000 description 2
- 230000006978 adaptation Effects 0.000 description 2
- 229910045601 alloy Inorganic materials 0.000 description 2
- 239000000956 alloy Substances 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 239000002131 composite material Substances 0.000 description 2
- 238000004049 embossing Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 229910000680 Aluminized steel Inorganic materials 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 230000000712 assembly Effects 0.000 description 1
- 238000000429 assembly Methods 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 230000003197 catalytic effect Effects 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 238000013016 damping Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000012774 insulation material Substances 0.000 description 1
- 238000003698 laser cutting Methods 0.000 description 1
- 239000010445 mica Substances 0.000 description 1
- 229910052618 mica group Inorganic materials 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 230000001012 protector Effects 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 239000000523 sample Substances 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010455 vermiculite Substances 0.000 description 1
- 229910052902 vermiculite Inorganic materials 0.000 description 1
- 235000019354 vermiculite Nutrition 0.000 description 1
- 230000003313 weakening effect Effects 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B77/00—Component parts, details or accessories, not otherwise provided for
- F02B77/11—Thermal or acoustic insulation
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L59/00—Thermal insulation in general
- F16L59/08—Means for preventing radiation, e.g. with metal foil
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Acoustics & Sound (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Exhaust Silencers (AREA)
- Shielding Devices Or Components To Electric Or Magnetic Fields (AREA)
Abstract
The invention relates to a heat shield for shielding an object against heat and for absorbing noise, which comprises two metal layers situated directly adjacent to one another. A
first of the metal layers has at least one perforated area, and the second of the metal layers is provided in at least a partial area with protrusions pointing in the direction toward the first metal layer, whose apices press against the first metal layer. The heat shield according to the invention does not have any further layers in addition to the two metal layers, in particular no nonmetallic insulation layer.
first of the metal layers has at least one perforated area, and the second of the metal layers is provided in at least a partial area with protrusions pointing in the direction toward the first metal layer, whose apices press against the first metal layer. The heat shield according to the invention does not have any further layers in addition to the two metal layers, in particular no nonmetallic insulation layer.
Description
HEAT SHIELD
The invention relates to a heat shield for shielding an object against heat and/or noise, which has two metal layers directly adjacent to one another.
Heat shields of this type are used as noise and/or heat protectors for other components. Heat shields are used, for example, in engine compartments of motor vehicles, in particular in the area of the exhaust system, to protect adjacent temperature-sensitive components and assemblies from excessive heating. The heat shields are often used simultaneously as a noise absorber.
To be able to absorb noise and shield heat to a sufficient extent, heat shields of this type frequently have an at least three-layered structure. The two cover layers typically comprise metal, in particular steel, aluminum-plated steel, or aluminum (alloy). A
nonmetallic insulation layer is embedded between the cover layers. It comprises, for example, mica or vermiculite, temperature-resistant cardboard, inorganic or organic fiber composite materials, or other suitable insulation materials such as fabrics, knitted fabrics, and/or warp knitted fabrics made of temperature-resistant fibers.
The nonmetallic inlays cause increased effort in regard to the recycling of the heat shields and are therefore often undesirable.
There is therefore a need for an entirely metallic recyclable heat shield, which, at the lowest possible weight and without fiber inlay and/or without porous absorber, is nonetheless as stable as possible and offers good noise and heat protection.
The object of the invention is accordingly to specify a heat shield which does not have the above disadvantages and is producible simply.
This object is achieved by the heat shield according to Claim 1. Preferred embodiments are described in the subclaims.
The invention relates to a heat shield for shielding an object against heat and/or noise, which has two metal layers directly adjacent to one another.
Heat shields of this type are used as noise and/or heat protectors for other components. Heat shields are used, for example, in engine compartments of motor vehicles, in particular in the area of the exhaust system, to protect adjacent temperature-sensitive components and assemblies from excessive heating. The heat shields are often used simultaneously as a noise absorber.
To be able to absorb noise and shield heat to a sufficient extent, heat shields of this type frequently have an at least three-layered structure. The two cover layers typically comprise metal, in particular steel, aluminum-plated steel, or aluminum (alloy). A
nonmetallic insulation layer is embedded between the cover layers. It comprises, for example, mica or vermiculite, temperature-resistant cardboard, inorganic or organic fiber composite materials, or other suitable insulation materials such as fabrics, knitted fabrics, and/or warp knitted fabrics made of temperature-resistant fibers.
The nonmetallic inlays cause increased effort in regard to the recycling of the heat shields and are therefore often undesirable.
There is therefore a need for an entirely metallic recyclable heat shield, which, at the lowest possible weight and without fiber inlay and/or without porous absorber, is nonetheless as stable as possible and offers good noise and heat protection.
The object of the invention is accordingly to specify a heat shield which does not have the above disadvantages and is producible simply.
This object is achieved by the heat shield according to Claim 1. Preferred embodiments are described in the subclaims.
The invention thus relates to a heat shield for shielding an object against heat and for absorbing noise, which comprises two metal layers situated directly adjacent to one another. A first of the metal layers has at least one perforated area, and the second of the metal layers is provided with at least one partial area having protrusions pointing in the direction of the first metal layer, whose apices press against the first metal layer.
Besides the two metal layers, the heat shield according to the invention has no further layers, in particular no nonmetallic insulation layer. Surprisingly, it has been established that such an insulation layer is not required at all for good noise and heat absorption if the two metal layers are implemented and oriented to one another in the way described. The first metal layer provided with the perforated area is situated toward the noise source and, through its perforation, allows noise not to be reflected, but rather be able to reach the interior of the heat shield and be absorbed therein. The resonance chambers formed between the protrusions of the second metal layer are used for setting the frequencies to be absorbed. The air cushion in the interior of the heat shield simultaneously forms an outstanding insulation layer against heat.
To ensure the best and most complete possible noise absorption, the perforated area preferably extends over the entire area of the first metal layer. The flow resistance with which noise may penetrate into the interior of the heat shield, and thus the absorption, may be set in a targeted manner via the design of the perforated area. The number, size, and shape of the holes and their distribution in the perforated area may be varied. If the entire first metal layer is not perforated, multiple perforated areas may also be distributed over the first metal layer, the design of the holes - except for a variation within each area - being able to differ from area to area. Perforated areas are expediently situated above all where high noise incidence is to be expected. Non-perforated or only slightly perforated areas may be provided where especially strong three-dimensional deformations of the heat shield are required for the overall shape of the heat shield and otherwise cracking would be a concern due to the weakening of the first metal layer because of the perforation.
Besides the two metal layers, the heat shield according to the invention has no further layers, in particular no nonmetallic insulation layer. Surprisingly, it has been established that such an insulation layer is not required at all for good noise and heat absorption if the two metal layers are implemented and oriented to one another in the way described. The first metal layer provided with the perforated area is situated toward the noise source and, through its perforation, allows noise not to be reflected, but rather be able to reach the interior of the heat shield and be absorbed therein. The resonance chambers formed between the protrusions of the second metal layer are used for setting the frequencies to be absorbed. The air cushion in the interior of the heat shield simultaneously forms an outstanding insulation layer against heat.
To ensure the best and most complete possible noise absorption, the perforated area preferably extends over the entire area of the first metal layer. The flow resistance with which noise may penetrate into the interior of the heat shield, and thus the absorption, may be set in a targeted manner via the design of the perforated area. The number, size, and shape of the holes and their distribution in the perforated area may be varied. If the entire first metal layer is not perforated, multiple perforated areas may also be distributed over the first metal layer, the design of the holes - except for a variation within each area - being able to differ from area to area. Perforated areas are expediently situated above all where high noise incidence is to be expected. Non-perforated or only slightly perforated areas may be provided where especially strong three-dimensional deformations of the heat shield are required for the overall shape of the heat shield and otherwise cracking would be a concern due to the weakening of the first metal layer because of the perforation.
In principle, the shape of the holes is arbitrary. Polygonal or rounded external contours and symmetrical or asymmetrical shapes are possible. Circular holes are preferred in regard to simple production. The diameter of the holes typically lies in a range from 0.05 mm to 3 mm, in particular from 0.08 mm to 1 mm. For asymmetrical holes, the largest diameter of the hole is used as the diameter. In general, the perforated area will contain 1 to 200 and in particular 3 to 100 holes per square centimeter. The area occupied by the holes is preferably between 0.1 % and 20 %, in particular between 0.2 % and 10 % of the total area of the first metal layer. The perforated metal layer is preferably smooth. If the perforation is generated using piercing or laser cutting, however, an additional surface structure may arise, in which the immediate surroundings of the particular holes may be shaped out of the plane of the metal layer. The structures arising in this way are an immediate continuation of the hole course transversely through the particular sheet. Intentional and/or targeted production of embossments on the perforated metal layer does not occur, however.
It is especially preferable if the implementation of the at least one perforated area, both in regard to its location and also the design of the perforation, is adapted to the implementation of the second metal layer. The adaptation is performed in particular in regard to optimized noise and heat absorption by the two-layer heat shield. The design of the resonance chamber, which lies behind the at least one perforated area of the first metal layer viewed from the noise source, bears special significance. The size and shape of the resonance chamber enclosed between first and second metal layers is important above all. It is designed in such a way that the noise oscillates in the perforation of the first metal layer and more or less "dies out" in the spring volume standing on this resonance chamber. The resonance chambers are used simultaneously as an insulation layer against heat, the heat source fundamentally being able to be located on either the side of the first or the second metal layer. The second metal layer is used as a noise and heat barrier and does not have any openings at least in those areas which are opposite to the perforated areas. The second metal layer is preferably entirely free of perforations except for those openings which are used for the passage of fasteners or components such as probes or the like.
These openings -which are also significantly larger than the microperforations of the first metal layer - pass through both metal layers as a whole, however, and the metal layers are typically sealed to one another in the area around these openings, so that noise and heat may not penetrate to the outside unobstructed here.
According to the invention, the resonance chambers between the first and second metal layers of the heat shield are generated in that protrusions are shaped into the second metal layer. 10 to 100 %, but preferably approximately 45 to 55 % of the protrusions point in the direction toward the first metal layer, against which the apices of the protrusions press. The resonance chambers, whose configuration, size, and shape is a function of the location, size, and shape of the protrusions, arise around the protrusions.
The protrusions are typically shaped into a planar blank of the second metal layer which has not yet been three-dimensionally deformed, by embossing, for example. The second metal layer is subsequently connected to the first metal layer, which is also not yet three-dimensionally deformed. The connection between both metal layers may be performed in ways typical per se, for example, in that the edge of one metal layer is flanged at least sectionally around the edge of the other. Subsequently, both metal layers are jointly deformed three-dimensionally into the final shape of the heat shield. The shape and the volume of the resonance chambers located between both layers may alter during this deformation. These alterations are to be considered beforehand in the design of the protrusions, so that the resonance chambers in the finished heat shield have the desired form. In specific applications, it may be advisable to connect the two metal layers to one another not only at their edges, but rather also in the area of their surfaces, so that the metal layers do not unintentionally move away from one another during the deformation. For this purpose, for example, spot welds may be placed in critical areas to connect both metal layers.
However, this is not preferable due to the additional effort.
The shape and size of the protrusions is selected in consideration of the above aspects. In addition, the intended three-dimensional deformation of the heat shield plays a further role in the design of the protrusions. The protrusions are expediently placed in such a way that they do not obstruct the desired shaping. Except for this, the shape of the protrusions may be selected freely and is not especially restricted. For example, the protrusions may have the shape of round or oval embossments which at least sectionally laterally delimit the resonance chambers. It is not fundamentally necessary for the resonance chambers to be completely separated from one another. Rather, they may also pass into one another and be largely open to one another. In a preferred embodiment of the invention, for example, the protrusions are implemented as embossments. Resonance chambers which are largely open to one another result between the first and second metal layers, similar to a column-supported vault.
The volume between first and second metal layers is preferably primarily predefined via the height of the protrusions and especially the embossments. The height may be and is generally varied over the area of the first and second metal layers. The cross-section of the embossments may also vary within an embossment and/or from embossment to embossment. The embossments preferably have a round or oval cross-section. For oval shapes, the maximum cross-section is not to be more than three times, preferably not more than twice, especially preferably not more than 1.5 times the maximum extension in the direction perpendicular thereto. For example, the following dimensions may be mentioned for the embossments: a diameter of 2 mm to 20 mm, in particular 3 mm to 8 mm, and a height of 1 mm to 20 mm, in particular 1.5 mm to 6 mm. The diameter is determined as the maximum diameter between the base points of the embossment. Base points are those points at which the slope of the embossment flanks passes through zero or its sign changes. The height of the embossments is measured as the maximum height between a base point and the embossment apex point or the embossment apex face.
Like the holes in the first metal layer, the distribution of the embossments over the area of the second metal layer may also change. 1 to 10, in particular 1 to 5 embossments are typically provided per square centimeter of the second metal layer. At least one of the two layers, but preferably both, does not have a pattern relationship in relation to the entire heat shield in regard to its embossments and/or holes. It may also be advantageous if the configuration of the embossments changes independently of the configuration of the holes in the adjacent layer. By targeted variation of dimensions and/or distribution of holes and/or embossments over the area occupied thereby and adaptation of these features to one another, a heat shield may be obtained which displays outstanding noise damping and heat protection effects, although it only comprises two layers and does not have a nonmetallic insulation layer.
The materials typical up to this point in the prior art may be used as materials for the metallic layers. For example, they comprise steel, aluminum-plated steel, or aluminum (alloys). Hot-dip aluminized steel is especially widely distributed. Stainless steels are preferred for fields of use having a high risk of corrosion and increased temperature strain, nickel-rich steels for high temperature applications. Aluminum-plated steel has special reflection properties. Because of the lack of the insulation layer, the two metallic layers may be formed comparatively thick, if the same thickness as for a three-layer heat shield is to be achieved. The danger of cracking during the three-dimensional deformation is thus reduced. Vice versa, in comparison to a three-layer heat shield, the total thickness of the heat shield or at least its weight may be reduced while maintaining the thickness of the metal layers. The metal layers of the heat shield typically have a thickness of 0.15 to 0.6 mm, preferably 0.25 to 0.4 mm. It is a function of the particular application whether equal sheet thicknesses or different sheet thicknesses are selected for both layers. The individual sheet thicknesses are selected as a function of the elasticity required for the three-dimensional deformation and the rigidity required for the deformed component in such a way that cracking is avoided in the finished part under usage conditions, but the most regular and reproducible possible pleating is made possible. The processing is performed in the way typical up to this point using tools typical up to this point. The protrusions are expediently embossed, the holes are preferably needled or stamped.
The heat shield according to the invention is typically used in the area of the internal combustion engine and exhaust system in motor vehicles. The heat shield may be used for shielding the exhaust manifold, the turbocharger, and add-on parts such as catalytic converter, precatalytic converter, particulate filter, or other components.
The invention is explained in greater detail hereafter on the basis of drawings. These drawings are used exclusively to illustrate preferred exemplary embodiments of the invention, without the invention being restricted thereto. Identical parts are provided with identical reference numerals in the drawings.
In the schematic figures:
Figure 1 shows a perspective view of a heat shield according to the invention, Figure 2 shows a partial top view of an area, provided with protrusions, of the second metal layer of the heat shield according to the invention from Figure 1 from the rear side, and Figure 3 shows a partial cross-section of the heat shield of Figure 1 along line A-A.
Figure 1 shows a heat shield 1 according to the invention. The heat shield comprises two metallic layers 2 and 3, which comprise aluminum-plated steel, for example. The two metallic layers 2 and 3 are connected to one another by flanging an edge area of one metallic layer around the edge of the other metallic layer, for example. A projecting edge area of the embossed layer 3 is preferably flanged around the edge of the perforated layer 2. The implementation of the flange in the opposite way is also fundamentally possible. The flange preferably runs around the entire edge of the heat shield, but may also be left out in individual sections. The flange in the area of the edge 10 of the heat shield 1 is not shown in detail here. The heat shield 1 essentially has a saddle-like shape. The three-dimensional deformation was generated by embossing from a planar and flat blank, which comprises a composite of metal layer 2 and metal layer 3. The heat shield 1 is a heat shield which is used in the area of an exhaust system of a motor vehicle, for example.
Fastener openings 8 are provided in the heat shield 1 for fastening in this area, through which fastening screws are guided and screwed to the vehicle body, for example.
To be able to absorb the noise of a noise source situated in front of the heat shield 1 in the direction toward the observer, such as an exhaust pipe, the first metal layer 2 facing toward the noise source has a perforated area 4. In the case shown, holes 7 are provided distributed essentially uniformly over the entire area of the metal layer 2. The entering noise is absorbed by the holes 7 of the heat shield. The cavity 9, which forms a resonance chamber for absorbing the noise, is obtained in that a plurality of protrusions 5 is embossed in the second metal layer 3, which comprises a metal sheet which is not provided with holes (except for the fastener openings 8). The protrusions 5 have the shape of round embossments here. The circles only indicate the location of the embossments 5, but not their precise size. The embossments 5 were already embossed in a planar blank of the metal layer 3 before the three-dimensional deformation of the heat shield 1 into its final saddle-like shape. In the example shown, the embossments 5 all have identical sizes and shapes and are distributed essentially uniformly over the area of the metal layer 3. Only in the area of the outside edges of the heat shield 1, directly adjoining the fastener openings 8, and in the areas which are three-dimensionally deformed especially strongly (indicated in Figure 1, for example, by the solid lines running over the metal layers 2 and 3), there are no protrusions 5.
The apices 6 of the embossments 5 point in the direction toward the first metal layer 2 and press against it. If necessary, both metal layers 2 and 3 may be fastened to one another at individual points over their surface. This is advisable above all in those areas which are three-dimensionally deformed especially strongly and in which the danger exists that the metal layers 2 and 3 will move away from one another upon deformation. Figure 3 shows an example of such a connection point in the form of a spot weld 11.
It is especially preferable if the implementation of the at least one perforated area, both in regard to its location and also the design of the perforation, is adapted to the implementation of the second metal layer. The adaptation is performed in particular in regard to optimized noise and heat absorption by the two-layer heat shield. The design of the resonance chamber, which lies behind the at least one perforated area of the first metal layer viewed from the noise source, bears special significance. The size and shape of the resonance chamber enclosed between first and second metal layers is important above all. It is designed in such a way that the noise oscillates in the perforation of the first metal layer and more or less "dies out" in the spring volume standing on this resonance chamber. The resonance chambers are used simultaneously as an insulation layer against heat, the heat source fundamentally being able to be located on either the side of the first or the second metal layer. The second metal layer is used as a noise and heat barrier and does not have any openings at least in those areas which are opposite to the perforated areas. The second metal layer is preferably entirely free of perforations except for those openings which are used for the passage of fasteners or components such as probes or the like.
These openings -which are also significantly larger than the microperforations of the first metal layer - pass through both metal layers as a whole, however, and the metal layers are typically sealed to one another in the area around these openings, so that noise and heat may not penetrate to the outside unobstructed here.
According to the invention, the resonance chambers between the first and second metal layers of the heat shield are generated in that protrusions are shaped into the second metal layer. 10 to 100 %, but preferably approximately 45 to 55 % of the protrusions point in the direction toward the first metal layer, against which the apices of the protrusions press. The resonance chambers, whose configuration, size, and shape is a function of the location, size, and shape of the protrusions, arise around the protrusions.
The protrusions are typically shaped into a planar blank of the second metal layer which has not yet been three-dimensionally deformed, by embossing, for example. The second metal layer is subsequently connected to the first metal layer, which is also not yet three-dimensionally deformed. The connection between both metal layers may be performed in ways typical per se, for example, in that the edge of one metal layer is flanged at least sectionally around the edge of the other. Subsequently, both metal layers are jointly deformed three-dimensionally into the final shape of the heat shield. The shape and the volume of the resonance chambers located between both layers may alter during this deformation. These alterations are to be considered beforehand in the design of the protrusions, so that the resonance chambers in the finished heat shield have the desired form. In specific applications, it may be advisable to connect the two metal layers to one another not only at their edges, but rather also in the area of their surfaces, so that the metal layers do not unintentionally move away from one another during the deformation. For this purpose, for example, spot welds may be placed in critical areas to connect both metal layers.
However, this is not preferable due to the additional effort.
The shape and size of the protrusions is selected in consideration of the above aspects. In addition, the intended three-dimensional deformation of the heat shield plays a further role in the design of the protrusions. The protrusions are expediently placed in such a way that they do not obstruct the desired shaping. Except for this, the shape of the protrusions may be selected freely and is not especially restricted. For example, the protrusions may have the shape of round or oval embossments which at least sectionally laterally delimit the resonance chambers. It is not fundamentally necessary for the resonance chambers to be completely separated from one another. Rather, they may also pass into one another and be largely open to one another. In a preferred embodiment of the invention, for example, the protrusions are implemented as embossments. Resonance chambers which are largely open to one another result between the first and second metal layers, similar to a column-supported vault.
The volume between first and second metal layers is preferably primarily predefined via the height of the protrusions and especially the embossments. The height may be and is generally varied over the area of the first and second metal layers. The cross-section of the embossments may also vary within an embossment and/or from embossment to embossment. The embossments preferably have a round or oval cross-section. For oval shapes, the maximum cross-section is not to be more than three times, preferably not more than twice, especially preferably not more than 1.5 times the maximum extension in the direction perpendicular thereto. For example, the following dimensions may be mentioned for the embossments: a diameter of 2 mm to 20 mm, in particular 3 mm to 8 mm, and a height of 1 mm to 20 mm, in particular 1.5 mm to 6 mm. The diameter is determined as the maximum diameter between the base points of the embossment. Base points are those points at which the slope of the embossment flanks passes through zero or its sign changes. The height of the embossments is measured as the maximum height between a base point and the embossment apex point or the embossment apex face.
Like the holes in the first metal layer, the distribution of the embossments over the area of the second metal layer may also change. 1 to 10, in particular 1 to 5 embossments are typically provided per square centimeter of the second metal layer. At least one of the two layers, but preferably both, does not have a pattern relationship in relation to the entire heat shield in regard to its embossments and/or holes. It may also be advantageous if the configuration of the embossments changes independently of the configuration of the holes in the adjacent layer. By targeted variation of dimensions and/or distribution of holes and/or embossments over the area occupied thereby and adaptation of these features to one another, a heat shield may be obtained which displays outstanding noise damping and heat protection effects, although it only comprises two layers and does not have a nonmetallic insulation layer.
The materials typical up to this point in the prior art may be used as materials for the metallic layers. For example, they comprise steel, aluminum-plated steel, or aluminum (alloys). Hot-dip aluminized steel is especially widely distributed. Stainless steels are preferred for fields of use having a high risk of corrosion and increased temperature strain, nickel-rich steels for high temperature applications. Aluminum-plated steel has special reflection properties. Because of the lack of the insulation layer, the two metallic layers may be formed comparatively thick, if the same thickness as for a three-layer heat shield is to be achieved. The danger of cracking during the three-dimensional deformation is thus reduced. Vice versa, in comparison to a three-layer heat shield, the total thickness of the heat shield or at least its weight may be reduced while maintaining the thickness of the metal layers. The metal layers of the heat shield typically have a thickness of 0.15 to 0.6 mm, preferably 0.25 to 0.4 mm. It is a function of the particular application whether equal sheet thicknesses or different sheet thicknesses are selected for both layers. The individual sheet thicknesses are selected as a function of the elasticity required for the three-dimensional deformation and the rigidity required for the deformed component in such a way that cracking is avoided in the finished part under usage conditions, but the most regular and reproducible possible pleating is made possible. The processing is performed in the way typical up to this point using tools typical up to this point. The protrusions are expediently embossed, the holes are preferably needled or stamped.
The heat shield according to the invention is typically used in the area of the internal combustion engine and exhaust system in motor vehicles. The heat shield may be used for shielding the exhaust manifold, the turbocharger, and add-on parts such as catalytic converter, precatalytic converter, particulate filter, or other components.
The invention is explained in greater detail hereafter on the basis of drawings. These drawings are used exclusively to illustrate preferred exemplary embodiments of the invention, without the invention being restricted thereto. Identical parts are provided with identical reference numerals in the drawings.
In the schematic figures:
Figure 1 shows a perspective view of a heat shield according to the invention, Figure 2 shows a partial top view of an area, provided with protrusions, of the second metal layer of the heat shield according to the invention from Figure 1 from the rear side, and Figure 3 shows a partial cross-section of the heat shield of Figure 1 along line A-A.
Figure 1 shows a heat shield 1 according to the invention. The heat shield comprises two metallic layers 2 and 3, which comprise aluminum-plated steel, for example. The two metallic layers 2 and 3 are connected to one another by flanging an edge area of one metallic layer around the edge of the other metallic layer, for example. A projecting edge area of the embossed layer 3 is preferably flanged around the edge of the perforated layer 2. The implementation of the flange in the opposite way is also fundamentally possible. The flange preferably runs around the entire edge of the heat shield, but may also be left out in individual sections. The flange in the area of the edge 10 of the heat shield 1 is not shown in detail here. The heat shield 1 essentially has a saddle-like shape. The three-dimensional deformation was generated by embossing from a planar and flat blank, which comprises a composite of metal layer 2 and metal layer 3. The heat shield 1 is a heat shield which is used in the area of an exhaust system of a motor vehicle, for example.
Fastener openings 8 are provided in the heat shield 1 for fastening in this area, through which fastening screws are guided and screwed to the vehicle body, for example.
To be able to absorb the noise of a noise source situated in front of the heat shield 1 in the direction toward the observer, such as an exhaust pipe, the first metal layer 2 facing toward the noise source has a perforated area 4. In the case shown, holes 7 are provided distributed essentially uniformly over the entire area of the metal layer 2. The entering noise is absorbed by the holes 7 of the heat shield. The cavity 9, which forms a resonance chamber for absorbing the noise, is obtained in that a plurality of protrusions 5 is embossed in the second metal layer 3, which comprises a metal sheet which is not provided with holes (except for the fastener openings 8). The protrusions 5 have the shape of round embossments here. The circles only indicate the location of the embossments 5, but not their precise size. The embossments 5 were already embossed in a planar blank of the metal layer 3 before the three-dimensional deformation of the heat shield 1 into its final saddle-like shape. In the example shown, the embossments 5 all have identical sizes and shapes and are distributed essentially uniformly over the area of the metal layer 3. Only in the area of the outside edges of the heat shield 1, directly adjoining the fastener openings 8, and in the areas which are three-dimensionally deformed especially strongly (indicated in Figure 1, for example, by the solid lines running over the metal layers 2 and 3), there are no protrusions 5.
The apices 6 of the embossments 5 point in the direction toward the first metal layer 2 and press against it. If necessary, both metal layers 2 and 3 may be fastened to one another at individual points over their surface. This is advisable above all in those areas which are three-dimensionally deformed especially strongly and in which the danger exists that the metal layers 2 and 3 will move away from one another upon deformation. Figure 3 shows an example of such a connection point in the form of a spot weld 11.
Claims (13)
1. A heat shield (1) for shielding an object against heat and for absorbing noise, comprising two metal layers (2, 3) situated directly adjacent to one another, wherein a first of the metal layers (2) has at least one perforated area (4) and the second of the metal layers (3) is provided in at least one partial area with protrusions (5) pointing in the direction toward the first metal layer (2), whose apices (6) press against the first metal layer (2).
2. The heat shield according to Claim 1, wherein the perforated area (4) extends over the entire area of the first metal layer (2).
3. The heat shield according to Claim 1 or 2, characterized in that the perforated area (4) contains 1 to 200, in particular 3 to 100 holes (7) per square centimeter.
4. The heat shield according to one of the preceding claims, wherein the area occupied by the holes (7) is between 0.1 % and 20 %, in particular between 0.2 % and 10 % of the total area of the first metal layer.
5. The heat shield according to one of the preceding claims, wherein the holes (7) have a diameter of 0.05 mm to 3 mm, in particular 0.08 mm to 1 mm.
6. The heat shield according to one of the preceding claims, wherein the protrusions (5) are implemented as embossments.
7. The heat shield according to Claim 6, wherein the embossments have at least one of the following properties:
- a diameter of 2 mm to 20 mm, in particular 3 nun to 8 mm, - a height of 1 mm to 10 mm, in particular 1.5 mm to 6 mm.
- a diameter of 2 mm to 20 mm, in particular 3 nun to 8 mm, - a height of 1 mm to 10 mm, in particular 1.5 mm to 6 mm.
8. The heat shield according to Claim 6 or 7, wherein 1 to 10, in particular 1 to 6 embossments are provided per square centimeter of the second metal layer (3).
9. The heat shield according to one of the preceding claims, wherein dimensions and/or distribution of holes (7) and/or embossments (5) change over the area occupied thereby.
10. The heat shield according to the preceding claims, wherein dimensions and/or distribution of holes (7) and/or embossments (5) change over the area occupied thereby in such a way that the distribution and/or dimension on at least one layer of the heat shield does not have a pattern relationship.
11. The heat shield according to one of Claims 9 through 10, wherein dimensions and/or distribution of holes (7) and dimensions and/or distribution of embossments (5) change independently of one another.
12. The heat shield according to one of the preceding claims, wherein the two metal layers (2, 3) are connected to one another in such a way that the edge of one of the two metal layers (2, 3) is at least sectionally folded around the edge of the other metal layer (3, 2).
13. The heat shield according to the preceding claim, wherein the edge of the second metal layer (3) is at least sectionally folded around the edge of the first metal layer (2).
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP07014702.0 | 2007-07-26 | ||
EP07014702A EP2019193A1 (en) | 2007-07-26 | 2007-07-26 | Heat shield |
Publications (1)
Publication Number | Publication Date |
---|---|
CA2638295A1 true CA2638295A1 (en) | 2009-01-26 |
Family
ID=39048866
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CA002638295A Abandoned CA2638295A1 (en) | 2007-07-26 | 2008-07-25 | Heat shield |
Country Status (5)
Country | Link |
---|---|
US (1) | US20090029139A1 (en) |
EP (1) | EP2019193A1 (en) |
BR (1) | BRPI0802438A2 (en) |
CA (1) | CA2638295A1 (en) |
MX (1) | MX2008009608A (en) |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2007134391A1 (en) * | 2006-05-23 | 2007-11-29 | Bellmax Acoustic Pty Ltd | An acoustic shield |
EP2022957B1 (en) * | 2007-07-26 | 2010-04-21 | Reinz-Dichtungs-Gmbh | Method of making a heat shield |
US10427778B2 (en) * | 2016-03-14 | 2019-10-01 | The Boeing Company | Heat shield assembly and method |
DE102017126433A1 (en) * | 2017-11-10 | 2019-05-16 | Elringklinger Ag | Shielding device and method for its production |
EP3636364A1 (en) * | 2018-10-09 | 2020-04-15 | Outokumpu Oyj | Method for manufacturing a crash frame of a battery compartment for battery electric vehicles |
US20230108070A1 (en) * | 2021-10-01 | 2023-04-06 | GM Global Technology Operations LLC | Bubble cover to reduce noise and vibration |
Family Cites Families (16)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1833143A (en) * | 1929-06-08 | 1931-11-24 | Burgess Lab Inc C F | Sound absorbing construction |
US2887173A (en) * | 1957-05-22 | 1959-05-19 | G A Societa Per Azioni Sa | Sound absorbing and insulating panel |
US3074339A (en) * | 1959-12-24 | 1963-01-22 | Gomma Antivibranti Applic | Sound-proofing, ventilating and conditioning |
US3507355A (en) * | 1969-05-22 | 1970-04-21 | Rohr Corp | Multi-layer face material for sound absorptive duct lining material |
DE2112393A1 (en) * | 1970-03-13 | 1971-10-28 | Rolls Royce | Soundproofing lining, in particular for gas turbine jet engines |
US4433751A (en) * | 1981-12-09 | 1984-02-28 | Pratt & Whitney Aircraft Of Canada Limited | Sound suppressor liner |
CH680918A5 (en) * | 1990-01-22 | 1992-12-15 | Matec Holding | |
DE69100377T2 (en) * | 1990-01-22 | 1994-01-20 | Atd Corp | Pillow-shaped structure with heat-conducting zones and thermal insulation zones and deformable laminate. |
DE4035177C2 (en) * | 1990-11-06 | 1996-04-11 | Helmut W Diedrichs | Shielding exhaust gas-carrying parts on a motor vehicle |
US5939212A (en) * | 1997-06-09 | 1999-08-17 | Atd Corporation | Flexible corrugated multilayer metal foil shields and method of making |
WO1998056573A1 (en) * | 1997-06-09 | 1998-12-17 | Atd Corporation | Shaped multilayer metal foil shield structures and method of making |
US6555246B1 (en) * | 1999-02-02 | 2003-04-29 | Rieter Automotive (International) Ag | Method of producing a sound-absorbent insulating element and insulating element produced according to this method |
ATE221006T1 (en) * | 1999-05-06 | 2002-08-15 | Faist Automotive Gmbh & Co Kg | SOUND SHIELDING ELEMENT, USE THEREOF AND METHOD FOR THE PRODUCTION THEREOF |
DE19925492A1 (en) * | 1999-06-04 | 2000-12-07 | Vaw Ver Aluminium Werke Ag | Heat shielding sheet comprises two microstructured metal sheets joined at discrete points along their surface |
DE20319319U1 (en) * | 2003-12-12 | 2005-04-28 | Carcoustics Tech Center Gmbh | Sound absorbing heat shield |
EP2022957B1 (en) * | 2007-07-26 | 2010-04-21 | Reinz-Dichtungs-Gmbh | Method of making a heat shield |
-
2007
- 2007-07-26 EP EP07014702A patent/EP2019193A1/en not_active Withdrawn
-
2008
- 2008-07-25 US US12/220,546 patent/US20090029139A1/en not_active Abandoned
- 2008-07-25 CA CA002638295A patent/CA2638295A1/en not_active Abandoned
- 2008-07-25 MX MX2008009608A patent/MX2008009608A/en not_active Application Discontinuation
- 2008-07-28 BR BRPI0802438-3A patent/BRPI0802438A2/en not_active IP Right Cessation
Also Published As
Publication number | Publication date |
---|---|
MX2008009608A (en) | 2009-02-26 |
US20090029139A1 (en) | 2009-01-29 |
BRPI0802438A2 (en) | 2009-06-16 |
EP2019193A1 (en) | 2009-01-28 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US20090029139A1 (en) | Heat shield | |
US7972708B2 (en) | Heat shield | |
US20080096451A1 (en) | Acoustic and Thermal Shielding Device | |
US5590524A (en) | Damped heat shield | |
US5233832A (en) | Damped heat shield | |
CA2339557C (en) | Laminate having shapability | |
US6966402B2 (en) | Acoustical heat shield | |
CA2840822C (en) | Two-layer composite heat shield for underbody of a vehicle | |
US6391469B1 (en) | Corrugated multilayer metal foil insulation panels and methods of making | |
EP1957317B1 (en) | Protective shield for thermal and acoustic shielding of components of an internal combustion engine | |
US20080292832A1 (en) | Structural component in the form of a heat shield | |
KR20070108265A (en) | Multi-layer dimpled heat shield | |
WO2011019783A2 (en) | Embossed thermal shield and methods of contruction and installation | |
US20100233430A1 (en) | Structured component, in particular heat shield | |
EP2734417B1 (en) | Sound and heat protection shield | |
KR101912620B1 (en) | A heat protector | |
JP5139063B2 (en) | Metal foil with different indentations | |
JP2012519626A (en) | Temperature vibration isolation element | |
US6090495A (en) | Flat structure made of foil or sheet metal to be used as a heat shield | |
US20100203286A1 (en) | Structured component, in particular a shielding element in the form of a heat shield | |
US6099809A (en) | Catalytic converter having a metal foil substrate | |
JP3553177B2 (en) | Automotive sound and heat insulation | |
EP1100700B1 (en) | Heat shields | |
US7739929B2 (en) | Structural component, a shielding component in particular | |
CA2414160A1 (en) | Multi-layered embossed heat shield for a vehicle exhaust system and other heat insulation applications |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
FZDE | Discontinued |
Effective date: 20130725 |