WO2001014169A1 - Ecran thermique pour vehicules a moteur - Google Patents

Ecran thermique pour vehicules a moteur Download PDF

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Publication number
WO2001014169A1
WO2001014169A1 PCT/EP2000/007946 EP0007946W WO0114169A1 WO 2001014169 A1 WO2001014169 A1 WO 2001014169A1 EP 0007946 W EP0007946 W EP 0007946W WO 0114169 A1 WO0114169 A1 WO 0114169A1
Authority
WO
WIPO (PCT)
Prior art keywords
heat shield
heat
perforation
motor vehicles
different
Prior art date
Application number
PCT/EP2000/007946
Other languages
German (de)
English (en)
Inventor
Helmut W. Diedrichs
Matthias Etzel
Original Assignee
Diedrichs Helmut W
Matthias Etzel
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Diedrichs Helmut W, Matthias Etzel filed Critical Diedrichs Helmut W
Publication of WO2001014169A1 publication Critical patent/WO2001014169A1/fr

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N13/00—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
    • F01N13/14—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00 having thermal insulation
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62D—MOTOR VEHICLES; TRAILERS
    • B62D25/00—Superstructure or monocoque structure sub-units; Parts or details thereof not otherwise provided for
    • B62D25/20—Floors or bottom sub-units
    • B62D25/2072—Floor protection, e.g. from corrosion or scratching
    • 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
    • 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

Definitions

  • the invention relates to a heat shield for motor vehicles for shielding exhaust gas-carrying parts of motor vehicles, consisting of a sheet metal part which is at least partially provided with a perforation.
  • Such heat shields are used to keep the heat radiation from exhaust gas-carrying parts of motor vehicles, in particular the exhaust system, from an adjacent body wall, for example a floor panel of the floor assembly of the motor vehicle. This heat shielding effect is strongest when the heat shield is designed as an unperforated sheet metal part.
  • the heat shields should also absorb the sound emitted by the exhaust gas-carrying parts as effectively as possible.
  • the sound absorbers used here for sound absorption are arranged on the back of the heat shield facing away from the exhaust gas-carrying part. Different embodiments are known for this, for example several metal foil layers with special structures or combinations with knitted mesh or expanded metal or also inorganic absorber materials. In order for these sound absorbers to be effective, it is necessary to establish a sound-permeable connection to the front of the heat shield on which the exhaust gas-carrying part is arranged.
  • the well-known heat shield is therefore provided with a perforation. Adequate sound coupling is only achieved if the perforated area is sufficiently large. Usually more than 25% of the area must be perforated.
  • the holes are made with a diameter of 2.5 - 5 mm.
  • Helmholtz resonators are also known to arrange Helmholtz resonators on the back of the perforated sheet metal part for sound absorption of heat shields.
  • the production and the cost of materials are also relatively high here.
  • the space required for the Helmholtz resonators, in particular when designing for low frequencies, is high; in many cases the required space is not available on the motor vehicle.
  • the object of the invention is therefore to design a heat shield of the type mentioned in such a way that very effective sound absorption is achieved without noticeably impairing the heat shielding effect and without requiring additional space.
  • This object is achieved in that the heat shield is designed as a micro-perforated sheet metal part with hole diameters of less than 1.5 mm, preferably less than 0.7 mm and that there is a cavity between the heat shield and the adjacent body wall.
  • the design of the perforation as microperforation with very small hole sizes means that the heat shielding effect of the heat shield is only very little compared to an unperforated design and is therefore not noticeably impaired in practice.
  • the heat shield forms a highly perforated micro-perforated sound absorber. Sound absorption takes place in that the air mass oscillating between the front of the heat shield and the cavity on the back is so strongly damped by shear forces in the very small holes that broadband sound absorption is achieved.
  • the arrangement of sound absorption elements behind the heat shield is therefore completely eliminated; this space at the back of the heat shield remains as a cavity.
  • microperforated panels as broadband sound absorbers is known per se (DE-GM G 93 20 543.0).
  • this known sound absorber consists of several thin, completely flat plates that are attached to a rigid frame.
  • the multi-layer, complex structure excludes the use in spatially shaped heat shields.
  • the resonance space on the back of the microperforated plate, which is required for a microperforated plate, can be formed in the heat shield according to the invention by the space already present between the heat shield and the adjacent body wall, which - since no separate sound absorption element is required in this area - as an air-filled cavity Available. This eliminates the need for a separate rear wall for sound absorbers with microperforated panels.
  • the heat shield thus constituted is a one-piece molded sheet metal part that retains the high heat shielding effect of an unperforated molded sheet part almost without restriction, but at the same time forms a broadband, very effective sound absorber without the need for an additional sound absorption element.
  • the space required for the cavity to be provided on the back of the sheet metal part is relatively small.
  • the heat shield can be arranged relatively close to the body wall to be shielded. The calculation methods developed for sound absorbers with micro-perforated plates make it possible to predict the sound absorption effect relatively accurately with little effort.
  • the cavity existing between the heat shield and the adjacent wall has different widths. Due to this fact, which can be produced in a simple manner due to the usual shape of body wall sections in motor vehicle construction and / or by suitable shape of the heat shield, the sound absorption effect can also be very simple, particularly with regard to its bandwidth and very particularly with regard to the absorption effect for low frequencies Agents are influenced and adapted to the respective application.
  • the heat shield can be designed without perforation in its area arranged directly above the exhaust gas-carrying part, if a completely unrestricted heat shielding effect is desired in this area.
  • Exemplary embodiments of the invention are illustrated below, which are shown in the drawing. It shows:
  • FIG. 2-9 in a simplified representation different embodiments of the perforation of the heat shield and
  • Fig. 10 in a section corresponding to Fig. 1, a modified version.
  • an exhaust gas-carrying part for example an exhaust line 1 of a motor vehicle, is shielded from an adjacent body wall 2, in the example shown a portion of the bottom wall of a motor vehicle, by a heat shield 3, which is attached to the body wall 2 at its edges ,
  • the heat shield 3 consists, for example, of aluminum and is a sheet metal part which is provided with a perforation 4 at least in some areas.
  • the perforation 4 is designed as a micro perforation.
  • Their holes 5 have hole diameters of, for example, 0.7 mm.
  • the cavity 6 Between the heat shield 3 and the adjacent body wall 2 there is a cavity 6 whose width B, which is determined by the distance between the heat shield 3 and the body wall 2, is different. In a departure from the exemplary embodiment shown, the cavity 6 can also be open on the side and / or front and rear.
  • the different width B of the cavity 6 in different areas of the heat shield 3 leads to a particularly large bandwidth of the absorption effect.
  • FIG. 7 shows an embodiment in which an unperforated area of the heat shield 3 is provided over the exhaust line 1, while its remaining areas show, for example, a uniform hole arrangement.
  • the perforation can also be omitted in the area of breakpoints and folds.
  • the heat shield 3 has only been shown schematically. It is understood that this is usually a spatially deformed sheet metal part.
  • the selected hole sizes can be chosen to be constant or different in the entire heat shield 3 in all the exemplary embodiments shown. This enables the sound attenuation to be influenced in a targeted manner for different frequencies.
  • FIG. 10 shows, in a sectional illustration corresponding to FIG. 1, in addition to the heat shield 5 described, a further heat shield 5 ′ which is arranged below the exhaust line 1 and which prevents heat emission from the exhaust line 1 downward. This precludes material that is located under the vehicle floor, for example leaves or dry grass, from being ignited by the heat radiated from the exhaust line 1.
  • a wall 2 ' is arranged at a distance from the heat shield 3' on the rear of the heat shield 3 ', ie on the underside of the vehicle.
  • a cavity 3 ' is formed in between.
  • the heat shield 3 ' is provided in the manner already described with a perforation 4' designed as a microperforation, the holes 5 'of which, for example, also have a diameter of 0.7 mm.
  • the heat shield 3 ' is attached to the underside of the exhaust line 1, for example by riveting or screwing.
  • the heat shield 3 ' is made together with the wall 2' from a one-piece sheet metal part.
  • the additional heat shield 3 extends laterally to close to the heat shield 3, so that the space surrounding the exhaust line 1 is largely closed.
  • This space can be ventilated and cooled in that the space is open at its front and rear ends, so that an air flow occurs during the journey.
  • the wall 2 'lies approximately in the plane of the floor surface of the motor vehicle, so that the underside of the vehicle is largely smooth, even in the area of the exhaust line 1.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • General Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Transportation (AREA)
  • Vehicle Interior And Exterior Ornaments, Soundproofing, And Insulation (AREA)
  • Exhaust Silencers (AREA)
  • Soundproofing, Sound Blocking, And Sound Damping (AREA)

Abstract

Ecran thermique (3) pour véhicules à moteur, qui sert à isoler les parties (1) servant à l'évacuation des gaz d'échappement et à l'absorption acoustique. Ledit écran (3) se présente sous forme de morceau de tôle pourvu de micro-perforations dont le diamètre est inférieur à 1,5 mm. L'écran thermique (3) et la paroi voisine (2) sont séparés par un espace vide (6) dont la largeur varie selon les différentes zones de l'écran thermique (3).
PCT/EP2000/007946 1999-08-20 2000-08-16 Ecran thermique pour vehicules a moteur WO2001014169A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19939482.2 1999-08-20
DE1999139482 DE19939482B4 (de) 1999-08-20 1999-08-20 Anordnung zur Abschirmung von abgasführenden Teilen von Kraftfahrzeugen

Publications (1)

Publication Number Publication Date
WO2001014169A1 true WO2001014169A1 (fr) 2001-03-01

Family

ID=7919001

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2000/007946 WO2001014169A1 (fr) 1999-08-20 2000-08-16 Ecran thermique pour vehicules a moteur

Country Status (2)

Country Link
DE (1) DE19939482B4 (fr)
WO (1) WO2001014169A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102012206617A1 (de) 2012-04-23 2013-10-24 Federal-Mogul Sealing Systems Gmbh Abschirmelement für Wärme und Schall

Families Citing this family (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10344036B4 (de) * 2003-09-23 2005-09-15 Aksys Gmbh Vorrichtung zur Schalldämpfung bei Kraftfahrzeugen
FR2860036B1 (fr) * 2003-09-24 2005-11-18 Cera Ecran de protection thermique et acoustique comprenant un complexe cousu
DE10349743A1 (de) * 2003-10-23 2005-06-02 Carcoustics Tech Center Gmbh Akustisch wirksame Unterbodenverkleidung für Kraftfahrzeuge
EP1655178A1 (fr) 2004-11-05 2006-05-10 Peugeot Citroen Automobiles SA Pièce d'équipement de véhicule automobile ayant des caractéristiques d'absorption acoustique, son procédé de fabrication, et application à un pareboue
FR2877594B1 (fr) * 2004-11-05 2007-01-26 Peugeot Citroen Automobiles Sa Piece d'equipement de vehicule automobile ayant des caracteristiques, d'absorption acoustique, et son procede de fabrication
FR2877595B1 (fr) * 2004-11-05 2007-01-26 Peugeot Citroen Automobiles Sa Pare-boue perfectionne de vehicule automobile
DE102006029087A1 (de) * 2006-06-24 2008-01-03 Elringklinger Ag Strukturbauteil, insbesondere Abschirmteil in Form eines Hitzeschildes
US7635048B2 (en) 2006-10-19 2009-12-22 Caterpillar Inc. Sound suppression device for internal combustion engine system
DE202007009806U1 (de) * 2007-06-01 2008-07-03 Bdd Beteiligungs Gmbh Isoliervorrichtung für ein Maschinenelement, insbesondere Abgasrohr
JP4601707B2 (ja) * 2008-04-21 2010-12-22 三和パッキング工業株式会社 加工用素材及びそれを用いる成型部材
FR3059977A1 (fr) * 2016-12-12 2018-06-15 Peugeot Citroen Automobiles Sa Ecran aerodynamique d’echappement et ligne d’echappement equipee de vehicule automobile
DE102017126433A1 (de) 2017-11-10 2019-05-16 Elringklinger Ag Abschirmvorrichtung und Verfahren zu dessen Herstellung

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE8900894U1 (de) * 1989-01-27 1990-05-31 Gerhardi & Cie GmbH & Co KG, 58511 Lüdenscheid Dämmschild für einen Kraftfahrzeugunterboden
DE9107484U1 (de) * 1991-06-18 1991-08-29 Diedrichs, Helmut W., 6100 Darmstadt Hitzeschild
DE4035177A1 (de) * 1990-11-06 1992-05-14 Helmut W Diedrichs Hitzeschild
DE4119783A1 (de) * 1991-06-15 1992-12-17 Irbit Research & Consulting Ag Schalldaemm- bzw. -daempfelement
US5196253A (en) * 1990-01-22 1993-03-23 Matec Holdikng Ag Sound absorbing heat shield with perforate support layer
DE4137706A1 (de) * 1991-11-15 1993-05-19 Bayerische Motoren Werke Ag Schallabsorbierende waermeisolierung

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3821468C2 (de) * 1988-06-25 1995-10-12 Helmut W Diedrichs Isolierformteil
DE9320543U1 (de) * 1993-04-20 1994-11-03 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung eV, 80636 München Schallabsorbierendes Bauteil
DE19722037A1 (de) * 1997-05-27 1998-12-03 Hecralmat Fa Hitzeschild mit Schallisolierung
DE19754107C1 (de) * 1997-12-05 1999-02-25 Fraunhofer Ges Forschung Schallabsorber

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE8900894U1 (de) * 1989-01-27 1990-05-31 Gerhardi & Cie GmbH & Co KG, 58511 Lüdenscheid Dämmschild für einen Kraftfahrzeugunterboden
US5196253A (en) * 1990-01-22 1993-03-23 Matec Holdikng Ag Sound absorbing heat shield with perforate support layer
DE4035177A1 (de) * 1990-11-06 1992-05-14 Helmut W Diedrichs Hitzeschild
DE4119783A1 (de) * 1991-06-15 1992-12-17 Irbit Research & Consulting Ag Schalldaemm- bzw. -daempfelement
DE9107484U1 (de) * 1991-06-18 1991-08-29 Diedrichs, Helmut W., 6100 Darmstadt Hitzeschild
DE4137706A1 (de) * 1991-11-15 1993-05-19 Bayerische Motoren Werke Ag Schallabsorbierende waermeisolierung

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102012206617A1 (de) 2012-04-23 2013-10-24 Federal-Mogul Sealing Systems Gmbh Abschirmelement für Wärme und Schall
WO2013159978A2 (fr) 2012-04-23 2013-10-31 Federal-Mogul Sealing Systems Gmbh Élément de protection contre la chaleur et le bruit

Also Published As

Publication number Publication date
DE19939482B4 (de) 2007-09-13
DE19939482A1 (de) 2001-03-01

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