EP0311797B1 - Sound damping covering element - Google Patents

Sound damping covering element Download PDF

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Publication number
EP0311797B1
EP0311797B1 EP19880114906 EP88114906A EP0311797B1 EP 0311797 B1 EP0311797 B1 EP 0311797B1 EP 19880114906 EP19880114906 EP 19880114906 EP 88114906 A EP88114906 A EP 88114906A EP 0311797 B1 EP0311797 B1 EP 0311797B1
Authority
EP
European Patent Office
Prior art keywords
layer
sound
flexible
core layer
produced
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.)
Expired - Lifetime
Application number
EP19880114906
Other languages
German (de)
French (fr)
Other versions
EP0311797A3 (en
EP0311797A2 (en
Inventor
Peter Dr.-Ing. Baur
Detlef Dr. Rer. Nat. Guhl
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
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 Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP0311797A2 publication Critical patent/EP0311797A2/en
Publication of EP0311797A3 publication Critical patent/EP0311797A3/en
Application granted granted Critical
Publication of EP0311797B1 publication Critical patent/EP0311797B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/16—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/162—Selection of materials
    • G10K11/168—Plural layers of different materials, e.g. sandwiches

Definitions

  • the invention relates to a sound-absorbing cover according to the generic preamble of the main claim.
  • an insulation board for sound and heat insulation for motor vehicles and the like which consists of several layers of differently porous and differently filled rubber or rubber-like plastic. What is essential for this known insulation board is the combination of two adjacent layers of foam, one of which contains a high proportion of filler, while the other is unfilled.
  • the invention has for its object to provide a sound-absorbing cover with very good sound insulation, which also has good mechanical properties, in particular high mechanical stability.
  • This object is achieved by the characterizing features of claim 1, wherein on the one hand through the central arrangement of an elastic layer with great damping capacity and a high degree of filling the required damping and on the other hand through the layers applied in an advantageous manner inside and outside the core layer the desired mechanical stability can be achieved.
  • Advantageous further developments have been achieved by the measures listed in the subclaims, both with regard to the layer structure of the cover and with regard to its manufacture.
  • the drawing shows a schematic section of a sound-absorbing cover element.
  • a sound-absorbing cover element 10 is shown schematically, which is designed here as a cylinder head cover for internal combustion engines.
  • the cover element 10 has a three-layer sandwich structure and consists of a core layer 11 which has an outer layer 12 on its outside and an inner layer 13 on its inside.
  • the outer layer 11 and / or the inner layer 13 consists of a thermosetting or thermoplastic plastic or instead of a e.g. deep-drawn metal foil.
  • the core layer 11 is formed from an elastic layer with high damping capacity and here consists of a rubber filled with fillers.
  • the term "rubber” includes materials of this type made of synthetic rubber, rubber or plastic, insofar as these have a rubber-elastic behavior that is specific to rubber.
  • the rubber as part of the core layer 11 is designed to be very soft. It has a very low Shore A hardness.
  • the filler has a high density, for example in the order of up to 3.8 g / cm3.
  • the filler consists of barium sulfate. It has been shown that a core layer 11 designed in this way enables very good sound insulation.
  • the cover element 10 can be produced in the compression molding or injection molding process, using a tool provided with plunging edges (so-called engagement tool), which allows the three layers 11, 12 and 13 of the sandwich to be applied one after the other.
  • the core layer 11 is first produced.
  • the outer layer 12 and inner layer 13 are then applied. If they consist of thermoplastic material, they are e.g. sprayed on or in foil form, e.g. in the form of thermoformed films.
  • the cover element 10 in particular as a cylinder head cover for internal combustion engines, provides very good sound insulation.
  • the cover element 10 is intended for other noise-reducing purposes, e.g. as a cover in the area of the oil pan or at other points in the engine of an internal combustion engine. All other applications for the sound-absorbing cover element 10 are also within the scope of the invention.

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Multimedia (AREA)
  • Cylinder Crankcases Of Internal Combustion Engines (AREA)
  • Vibration Dampers (AREA)
  • Laminated Bodies (AREA)

Description

Stand der TechnikState of the art

Die Erfindung geht aus von einer schalldämmenden Abdeckhaube nach dem gattungsbildenden Oberbegriff des Hauptanspruchs.The invention relates to a sound-absorbing cover according to the generic preamble of the main claim.

Aus der DE-A 26 58 379 ist eine Dämmplatte zur Schall- und Wärmeisolierung für Kraftfahrzeuge und dergleichen bekannt, welche aus mehreren Schichten aus unterschiedlich porösem und unterschiedlich hoch gefülltem Gummi oder gummiähnlichem Kunststoff besteht. Wesentlich für diese bekannte Dämmplatte ist die Kombination von zwei benachbarten Schaumstoffschichten, von denen eine einen hohen Füllstoffanteil enthält, während der andere Schaumstoff ungefüllt ist.From DE-A 26 58 379 an insulation board for sound and heat insulation for motor vehicles and the like is known, which consists of several layers of differently porous and differently filled rubber or rubber-like plastic. What is essential for this known insulation board is the combination of two adjacent layers of foam, one of which contains a high proportion of filler, while the other is unfilled.

Der Erfindung liegt die Aufgabe zugrunde, eine schalldämmende Abdeckhaube mit sehr guter Schalldämmung zu schaffen, welche gleichzeitig auch gute mechanische Eigenschaften, insbesondere eine hohe mechanische Stabilität aufweist. Diese Aufgabe wird gelöst durch die kennzeichnenden Merkmale des Anspruchs 1, wobei einerseits durch die zentrale Anordnung einer elastischen Schicht mit großem Dämpfungsvermögen und einem hohen Füllgrad die erforderliche Dämpfung und andererseits durch die in vorteilhafter Weise aufgebrachten Schichten innerhalb und außerhalb der Kernschicht die gewünschte mechanische Stabilität erreicht werden. Durch die in den Unteransprüchen aufgeführten Maßnahmen sind vorteilhafte Weiterbildungen erzielt worden sowohl hinsichtlich des Schichtaufbaus der Abdeckhaube als auch hinsichtlich ihrer Herstellung.The invention has for its object to provide a sound-absorbing cover with very good sound insulation, which also has good mechanical properties, in particular high mechanical stability. This object is achieved by the characterizing features of claim 1, wherein on the one hand through the central arrangement of an elastic layer with great damping capacity and a high degree of filling the required damping and on the other hand through the layers applied in an advantageous manner inside and outside the core layer the desired mechanical stability can be achieved. Advantageous further developments have been achieved by the measures listed in the subclaims, both with regard to the layer structure of the cover and with regard to its manufacture.

Zeichnungdrawing

Ein Ausführungsbeispiel der Erfindung ist in der Zeichnung dargestellt und in der nachfolgenden Beschreibung näher erläutert. Die Zeichnung zeigt einen schematischen Schnitt eines schalldämmenden Abdeckelementes.An embodiment of the invention is shown in the drawing and explained in more detail in the following description. The drawing shows a schematic section of a sound-absorbing cover element.

Beschreibung des AusführungsbeispielsDescription of the embodiment

In der Zeichnung ist schematisch ein schalldämmendes Abdeckelement 10 gezeigt, das hier als Zylinderkopfhaube für Brennkraftmaschinen ausgebildet ist. Das Abdeckelement 10 hat einen dreischichtigen Sandwichaufbau und besteht aus einer Kernschicht 11, die auf ihrer Außenseite eine Außenschicht 12 und auf ihrer Innenseite eine Innenschicht 13 aufweist.In the drawing, a sound-absorbing cover element 10 is shown schematically, which is designed here as a cylinder head cover for internal combustion engines. The cover element 10 has a three-layer sandwich structure and consists of a core layer 11 which has an outer layer 12 on its outside and an inner layer 13 on its inside.

Die Außenschicht 11 und/oder die Innenschicht 13 besteht aus einem duroplastischen oder thermoplastischen Kunststoff oder statt dessen aus einer z.B. tiefgezogenen Metallfolie.The outer layer 11 and / or the inner layer 13 consists of a thermosetting or thermoplastic plastic or instead of a e.g. deep-drawn metal foil.

Die Kernschicht 11 ist aus einer elastischen Schicht mit großem Dämpfungsvermögen gebildet und besteht hier aus einem mit Füllstoffen gefüllten Gummi. Der Begriff "Gummi" schließt Materialien dieser Art aus Kunstgummi, Kautschuk oder Kunststoff ein, soweit diese ein dem Gummi eigenes gummielastisches Verhalten haben. Der Gummi als Teil der Kernschicht 11 ist sehr weich ausgelegt. Er hat eine sehr niedrige Shore A Härte. Der Füllstoff weist eine große Dichte auf, z.B. in der Größenordnung bis zu 3,8 g/cm³. Der Füllstoff besteht hier aus Bariumsulfat. Es hat sich gezeigt, daß eine so gestaltete Kernschicht 11 eine sehr gute Schalldämmung ermöglicht.The core layer 11 is formed from an elastic layer with high damping capacity and here consists of a rubber filled with fillers. The term "rubber" includes materials of this type made of synthetic rubber, rubber or plastic, insofar as these have a rubber-elastic behavior that is specific to rubber. The rubber as part of the core layer 11 is designed to be very soft. It has a very low Shore A hardness. The filler has a high density, for example in the order of up to 3.8 g / cm³. The filler consists of barium sulfate. It has been shown that a core layer 11 designed in this way enables very good sound insulation.

Das Abdeckelement 10 ist bei Verwendung heißhärtender Materialien im Preß- oder Spritzgießverfahren herstellbar, wobei man sich eines mit Tauchkanten versehenen Werkzeuges (sog. Eingriffswerkzeug) bedient, welches es gestattet, die drei Schichten 11, 12 und 13 des Sandwiches nacheinander aufzubringen.When using thermosetting materials, the cover element 10 can be produced in the compression molding or injection molding process, using a tool provided with plunging edges (so-called engagement tool), which allows the three layers 11, 12 and 13 of the sandwich to be applied one after the other.

Bei einer anderen Methode wird zunächst die Kernschicht 11 hergestellt. Danach werden die Außenschicht 12 und Innenschicht 13 aufgebracht. Bestehen diese aus thermoplastischem Kunststoff, so werden diese z.B. aufgespritzt oder in Folienform, z.B. in Form von Tiefziehfolien, aufgebracht.In another method, the core layer 11 is first produced. The outer layer 12 and inner layer 13 are then applied. If they consist of thermoplastic material, they are e.g. sprayed on or in foil form, e.g. in the form of thermoformed films.

Das Abdeckelement 10, insbesondere als Zylinderkopfhaube für Brennkraftmaschinen, bewirkt eine sehr gute Schalldämmung. Bei einem anderen, nicht gezeigten Ausführungsbeispiel ist das Abdeckelement 10 für andere geräuschdämmende Zwecke bestimmt, z.B. als Abdeckung im Bereich der Ölwanne oder an anderen Stellen des Motors einer Brennkraftmaschine. Auch alle übrigen Anwendungen für das schalldämmende Abdeckelement 10 liegen im Rahmen der Erfindung.The cover element 10, in particular as a cylinder head cover for internal combustion engines, provides very good sound insulation. In another embodiment, not shown, the cover element 10 is intended for other noise-reducing purposes, e.g. as a cover in the area of the oil pan or at other points in the engine of an internal combustion engine. All other applications for the sound-absorbing cover element 10 are also within the scope of the invention.

Claims (6)

  1. Sound-damping cover, in particular a cylinder-head cover for internal-combustion engines, having an inner layer, a core layer and an outer layer, characterized in that a flexible layer with great damping characteristics forms the core layer, in that the outer layer (12) and the inner layer (13) are formed by a heat-curing thermoplastic material processed by injection moulding, and in that the flexible core layer (11) consists of a rubber layer which is filled with fillers and is likewise produced by injection moulding.
  2. Sound-damping cover according to Claim 1, characterized in that the rubber of the flexible layer (11) has a very low Shore A hardness.
  3. Sound-damping cover according to Claim 1 or 2, characterized in that the filler of the flexible core layer (11) has a great density, for example of the order of magnitude of up to 3.8 g/cm³.
  4. Sound-damping cover according to one of the preceding claims, characterized in that the filler consists of barium sulphate.
  5. Production process of a sound-damping cover according to one of Claims 1 to 4, characterized in that first of all the core layer (11), consisting of the flexible, filled layer, is produced and thereafter the remaining layers (12, 13) are applied.
  6. Production process according to Claim 5, characterized in that a three-layered sandwich is produced by the injection-moulding process in a mould provided with vertical flash faces and the three layers (11 to 13) of the sandwich are thereby produced one after the other.
EP19880114906 1987-10-10 1988-09-13 Sound damping covering element Expired - Lifetime EP0311797B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19873734312 DE3734312A1 (en) 1987-10-10 1987-10-10 SOUND-INSULATING COVER ELEMENT
DE3734312 1987-10-10

Publications (3)

Publication Number Publication Date
EP0311797A2 EP0311797A2 (en) 1989-04-19
EP0311797A3 EP0311797A3 (en) 1990-09-12
EP0311797B1 true EP0311797B1 (en) 1995-03-08

Family

ID=6338053

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19880114906 Expired - Lifetime EP0311797B1 (en) 1987-10-10 1988-09-13 Sound damping covering element

Country Status (3)

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EP (1) EP0311797B1 (en)
DE (1) DE3734312A1 (en)
ES (1) ES2070122T3 (en)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE9213804U1 (en) * 1992-10-13 1994-02-10 M. Faist GmbH & Co KG, 86381 Krumbach Recycle-oriented laminate element for sound insulation
DE4404502C2 (en) * 1994-02-12 2002-02-28 Bosch Gmbh Robert Sound absorbing cover
DE19712472C2 (en) * 1997-03-25 2002-07-04 Greiner Gmbh Process for producing a heavy layer molded part for structure-borne noise insulation
DE102004007602B4 (en) * 2004-02-17 2014-06-18 Volkswagen Ag Cover for an internal combustion engine of a motor vehicle
DE102006039756A1 (en) * 2006-08-24 2008-02-28 Elringklinger Ag Shielding component, in particular heat shield
AT503644B1 (en) * 2006-09-25 2007-12-15 Trumpf Maschinen Austria Gmbh Method for operating bending presses uses sensors determining restoring force on press beam, uprights and drive system and reactive force of workpiece at beam reversing position and reducing to allow rapid return of ram to upper position

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE810661C (en) * 1948-10-02 1951-10-25 Siemens & Halske A G Sound and vibration isolating component, especially for walls or the like.
GB1451707A (en) * 1974-07-26 1976-10-06 British Uralite Ltd Noise control materials
DE2658379A1 (en) * 1976-12-23 1978-06-29 Phoenix Gummiwerke Ag INSULATION PANEL FOR SOUND AND HEAT INSULATION
DE2818252A1 (en) * 1978-04-26 1979-11-08 Helmut Pelzer Motor vehicle body noise suppressing panel - has outer layers of different hardness and low bulk density laminated to inner layer of foamed plastics or felt
US4223073A (en) * 1978-10-30 1980-09-16 Minnesota Mining And Manufacturing Company High-temperature damping composite
US4303723A (en) * 1980-02-04 1981-12-01 The Goodyear Tire & Rubber Company Sound barrier material
US4452841A (en) * 1982-12-20 1984-06-05 The Goodyear Tire & Rubber Company Unsupported shaped sound barrier component

Also Published As

Publication number Publication date
EP0311797A3 (en) 1990-09-12
EP0311797A2 (en) 1989-04-19
DE3734312C2 (en) 1991-08-08
DE3734312A1 (en) 1989-04-27
ES2070122T3 (en) 1995-06-01

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