US20090029139A1 - Heat shield - Google Patents

Heat shield Download PDF

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Publication number
US20090029139A1
US20090029139A1 US12/220,546 US22054608A US2009029139A1 US 20090029139 A1 US20090029139 A1 US 20090029139A1 US 22054608 A US22054608 A US 22054608A US 2009029139 A1 US2009029139 A1 US 2009029139A1
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US
United States
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
Application number
US12/220,546
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English (en)
Inventor
Franz Schweiggart
Thomas Dietrich-Radt
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Individual
Original Assignee
Individual
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Filing date
Publication date
Application filed by Individual filed Critical Individual
Publication of US20090029139A1 publication Critical patent/US20090029139A1/en
Abandoned legal-status Critical Current

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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

Definitions

  • 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.
  • 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.
  • the object of the invention is accordingly to specify a heat shield which does not have the above disadvantages and is producible simply.
  • 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.
  • FIG. 1 shows a perspective view of a heat shield according to the invention
  • FIG. 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 FIG. 1 from the rear side, and
  • FIG. 3 shows a partial cross-section of the heat shield of FIG. 1 along line A-A.
  • 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.
  • 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.
  • 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.
  • 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.
  • the implementation of the at least one perforated area 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.
  • 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.
  • 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.
  • the shape and size of the protrusions is selected in consideration of the above aspects.
  • 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.
  • the shape of the protrusions may be selected freely and is not especially restricted.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • FIG. 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.
  • the first metal layer 2 facing toward the noise source has a perforated area 4 .
  • 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 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.
  • 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 FIG. 1 , for example, by the solid lines running over the metal layers 2 and 3 ), there are no protrusions 5 .
  • 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.
  • FIG. 3 shows an example of such a connection point in the form of a spot weld 11 .

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  • 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)
US12/220,546 2007-07-26 2008-07-25 Heat shield Abandoned US20090029139A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP07014702.0 2007-07-26
EP07014702A EP2019193A1 (de) 2007-07-26 2007-07-26 Hitzeschild

Publications (1)

Publication Number Publication Date
US20090029139A1 true US20090029139A1 (en) 2009-01-29

Family

ID=39048866

Family Applications (1)

Application Number Title Priority Date Filing Date
US12/220,546 Abandoned US20090029139A1 (en) 2007-07-26 2008-07-25 Heat shield

Country Status (5)

Country Link
US (1) US20090029139A1 (de)
EP (1) EP2019193A1 (de)
BR (1) BRPI0802438A2 (de)
CA (1) CA2638295A1 (de)
MX (1) MX2008009608A (de)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20090075041A1 (en) * 2007-07-26 2009-03-19 Franz Schweiggart Heat shield
US20110139542A1 (en) * 2006-05-23 2011-06-16 Bellmax Acoustic Pty Ltd Acoustic shield
EP3219600A1 (de) * 2016-03-14 2017-09-20 The Boeing Company Hitzeschildanordnung und -verfahren
DE102017126433A1 (de) * 2017-11-10 2019-05-16 Elringklinger Ag Abschirmvorrichtung und Verfahren zu dessen Herstellung
US20210351469A1 (en) * 2018-10-09 2021-11-11 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

Citations (13)

* Cited by examiner, † Cited by third party
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
US3748213A (en) * 1970-03-13 1973-07-24 Rolls Royce Acoustic linings
US4433751A (en) * 1981-12-09 1984-02-28 Pratt & Whitney Aircraft Of Canada Limited Sound suppressor liner
US5196253A (en) * 1990-01-22 1993-03-23 Matec Holdikng Ag Sound absorbing heat shield with perforate support layer
US5800905A (en) * 1990-01-22 1998-09-01 Atd Corporation Pad including heat sink and thermal insulation area
US6451447B1 (en) * 1997-06-09 2002-09-17 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
US6660403B2 (en) * 1997-06-09 2003-12-09 Atd Corporation Flexible corrugated multilayer metal foil shields and method of making
US20070122568A1 (en) * 2003-12-12 2007-05-31 Bloemeling Heinz Sound absorbing heat shield
US20090075041A1 (en) * 2007-07-26 2009-03-19 Franz Schweiggart Heat shield

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4035177C2 (de) * 1990-11-06 1996-04-11 Helmut W Diedrichs Abschirmung von abgasführenden Teilen an einem Kraftfahrzeug
ATE221006T1 (de) * 1999-05-06 2002-08-15 Faist Automotive Gmbh & Co Kg Schallabschirmelement, verwendung desselben und verfahren zu dessen herstellung
DE19925492A1 (de) * 1999-06-04 2000-12-07 Vaw Ver Aluminium Werke Ag Wärmeabschirmblech

Patent Citations (13)

* Cited by examiner, † Cited by third party
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
US3748213A (en) * 1970-03-13 1973-07-24 Rolls Royce Acoustic linings
US4433751A (en) * 1981-12-09 1984-02-28 Pratt & Whitney Aircraft Of Canada Limited Sound suppressor liner
US5196253A (en) * 1990-01-22 1993-03-23 Matec Holdikng Ag Sound absorbing heat shield with perforate support layer
US5800905A (en) * 1990-01-22 1998-09-01 Atd Corporation Pad including heat sink and thermal insulation area
US6451447B1 (en) * 1997-06-09 2002-09-17 Atd Corporation Shaped multilayer metal foil shield structures and method of making
US6660403B2 (en) * 1997-06-09 2003-12-09 Atd Corporation Flexible corrugated multilayer metal foil shields 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
US20070122568A1 (en) * 2003-12-12 2007-05-31 Bloemeling Heinz Sound absorbing heat shield
US20090075041A1 (en) * 2007-07-26 2009-03-19 Franz Schweiggart Heat shield

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20110139542A1 (en) * 2006-05-23 2011-06-16 Bellmax Acoustic Pty Ltd Acoustic shield
US20090075041A1 (en) * 2007-07-26 2009-03-19 Franz Schweiggart Heat shield
US7972708B2 (en) * 2007-07-26 2011-07-05 Dana Automotive Systems Group, Llc Heat shield
EP3219600A1 (de) * 2016-03-14 2017-09-20 The Boeing Company Hitzeschildanordnung und -verfahren
US10427778B2 (en) 2016-03-14 2019-10-01 The Boeing Company Heat shield assembly and method
US11279462B2 (en) 2016-03-14 2022-03-22 The Boeing Company Heat shield assembly and method
DE102017126433A1 (de) * 2017-11-10 2019-05-16 Elringklinger Ag Abschirmvorrichtung und Verfahren zu dessen Herstellung
US20210351469A1 (en) * 2018-10-09 2021-11-11 Outokumpu Oyj Method for manufacturing a crash frame of a battery compartment for battery electric vehicles
US11967727B2 (en) * 2018-10-09 2024-04-23 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

Also Published As

Publication number Publication date
MX2008009608A (es) 2009-02-26
CA2638295A1 (en) 2009-01-26
BRPI0802438A2 (pt) 2009-06-16
EP2019193A1 (de) 2009-01-28

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