Sound insulating vehicle body part
First Claim
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1. Inherently stable self-supporting composite part for engine hoods for acoustic screening of noise sources, comprising:
- a shaped outside sheet of thermosetting plastic material and having an inside form and an inner surface;
a noise-insulating inside packing fastened directly to the outside sheet, which inside packing has a continuous inner surface opposite said outside sheet inner surface, and where said inside packing is adapted corresponding to the inside form of the outside sheet and has countersunk deformations, which together with the outside sheet form open acoustically effective hollow spaces between said outside sheet inner surface and said inside packing continuous inner surface;
the inner packing comprising a fiber fleece adhered with a phenolic resin, and covered with a fiber mat in direct contact with said fiber fleece; and
said outer sheet and said inside packing cooperating to form a self-supporting structure, independent of the engine hood.
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Abstract
There is described a sound-insulating power vehicle part which includes a shaped outer sheet and an acoustically effective inside packing which together form an inherently stable lightweight composite part. To obtain this, a thermosetting plastic is used for the outer sheet while the inside packing is formed of a fiber-resin fleece, which is only slightly compacted in an acoustically effective main area and is closely compacted in its stabilizing areas.
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Citations
29 Claims
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1. Inherently stable self-supporting composite part for engine hoods for acoustic screening of noise sources, comprising:
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a shaped outside sheet of thermosetting plastic material and having an inside form and an inner surface; a noise-insulating inside packing fastened directly to the outside sheet, which inside packing has a continuous inner surface opposite said outside sheet inner surface, and where said inside packing is adapted corresponding to the inside form of the outside sheet and has countersunk deformations, which together with the outside sheet form open acoustically effective hollow spaces between said outside sheet inner surface and said inside packing continuous inner surface; the inner packing comprising a fiber fleece adhered with a phenolic resin, and covered with a fiber mat in direct contact with said fiber fleece; and said outer sheet and said inside packing cooperating to form a self-supporting structure, independent of the engine hood. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. An inherently stable self-supporting composite part for engine hoods for acoustic screening of noise sources, comprising:
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an outer sheet of thermosetting material, a noise-insulating inside packing comprising a fiber fleece adhered with a plastic resin and covered with a fiber mat in direct contact with said fiber fleece, said inside packing including; one or more acoustically effective countersunk deformations of a first thickness formed therein, one or more stabilizing reinforcement zones formed peripherally around said acoustically effective countersunk deformations and of a thickness less than said first thickness, and a supporting system comprising highly compacted bonded zones of a thickness less than said first thickness and surrounding said countersunk deformations and said reinforcement zones and contacting said outer sheet, wherein said outer sheet and said countersunk deformations form open free spaces therebetween which serve as Helmholtz resonators and wherein said highly compacted bonded zones contacting said outer sheet provide the only support between said inside packing and said outer sheet and cooperate to form a self-supporting structure independent of the engine hood. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21, 22, 23)
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24. Inherently stable self-supporting composite part for engine hoods for acoustic screening of noise sources, comprising a plurality of layers arranged in a normal direction:
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a shaped outside sheet of thermosetting plastic material and having an inside form; a noise-insulating inside packing fastened directly to the outside sheet, which inside packing is adapted corresponding to the inside form of the outside sheet and has countersunk deformations, which together with the outside sheet form acoustically effective hollow spaces continuous in a direction transverse to said normal direction; the inside packing comprising a fiber fleece adhered with a phenolic resin, and covered with a fiber mat; and said outside sheet and said inside packing cooperating to form a self-supporting structure, independent of the engine hood.
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25. An inherently stable composite part for engine hoods for acoustic screening of noise sources, comprising a plurality of layers arranged in a normal direction:
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an outer sheet of thermosetting material; a noise-insulating inside packing comprising a fiber fleece adhered with a plastic resin and covered with a fiber mat; said inside packing including; one or more acoustically effective countersunk deformations of a first thickness formed therein; one or more stabilizing reinforcement zones formed peripherally around said acoustically effective countersunk deformations and of a thickness less than said first thickness, and a supporting system comprising highly compacted bonded zones of a thickness less than said first thickness and surrounding said countersunk deformations and said reinforcement zones and contacting said outer sheet; wherein said outer sheet and said countersunk deformations form free spaces continuous in a direction transverse to said normal direction and which serve as Helmholtz resonators and wherein said highly compacted bonded zones contacting said outer sheet provide the only support between said inside packing and said outer sheet and cooperate to form a self-supporting structure independent of the engine hood.
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26. Inherently stable self-supporting composite part for engine hoods for acoustic screening of noise sources, comprising:
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a shaped outside sheet of thermosetting plastic material and having an inside form and an inner surface; a noise-insulating inside packing fastened directly to the outside sheet, which inside packing has a continuous inner surface opposite said outside sheet inner surface, and where said inside packing is adapted corresponding to the inside form of the outside sheet and has countersunk deformations, which together with the outside sheet form open acoustically effective hollow spaces between said outside sheet inner surface and said inside packing continuous inner surface; the inside packing comprising a fiber fleece adhered with a phenolic resin, and covered with a fiber mat in direct contact with said fiber fleece thereby providing a porous structure having a porosity formed without puncturing said inside packing; and said outside sheet and said inside packing cooperating to form a self-supporting structure, independent of the engine hood.
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27. An inherently stable self-supporting composite part for engine hoods for acoustic screening of noise sources, comprising:
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an outer sheet of thermosetting material, a noise-insulating inside packing comprising a fiber fleece adhered with a plastic resin and covered with a fiber mat in direct contact with said fiber fleece, said inside packing including; one or more acoustically effective countersunk deformations of a first thickness formed therein, one or more stabilizing reinforcement zones formed peripherally around said acoustically effective countersunk deformations and of a thickness less than said first thickness, and a supporting system comprising highly compacted bonded zones of a thickness less than said first thickness and surrounding said countersunk deformations and said reinforcement zones and contacting said outer sheet, wherein said outer sheet and said countersunk deformations form open free spaces therebetween which serve as Helmholtz resonators confined between said outer sheet and said inside packing and wherein said highly compacted bonded zones contacting said outer sheet provide the only support between said inside packing and said outer sheet and cooperate to form a self-supporting structure independent of the engine hood.
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28. Inherently stable self-supporting composite part for engine hoods for acoustic screening of noise sources, comprising a plurality of layers arranged in a normal direction;
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a shaped outside sheet of thermosetting plastic material and having an inside form; a noise-insulating inside packing fastened directly to the outside sheet, which inside packing is adapted corresponding to the inside form of the outside sheet and has countersunk deformations, which together with the outside sheet form acoustically effective hollow spaces continuous in a direction transverse to said normal direction; the inside packing comprising a fiber fleece adhered with a phenolic resin, and covered with a fiber mat wherein said inside packing has a porosity formed without puncturing said inside packing; and said outside sheet and said inside packing cooperating to form a self-supporting structure, independent of the engine hood.
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29. An inherently stable composite part for engine hoods for acoustic screening of noise sources, comprising a plurality of layers arranged in a normal direction:
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an outer sheet of thermosetting material; a noise-insulating inside packing comprising a fiber fleece adhered with a plastic resin and covered with a fiber mat; said inside packing including; one or more acoustically effective countersunk deformations of a first thickness formed therein; one or more stabilizing reinforcement zones formed peripherally around said acoustically effective countersunk deformations and of a thickness less than said first thickness, and a supporting system comprising highly compacted bonded zones of a thickness less than said first thickness and surrounding said countersunk deformations and said reinforcement zones and contacting said outer sheet; wherein said outer sheet and said countersunk deformations form free spaces continuous in a direction transverse to said normal direction and which serve as Helmholtz resonators confined between said outer sheet and said inside packing and wherein said highly compacted bonded zones contacting said outer sheet provide the only support between said inside packing and said outer sheet and cooperate to form a self-supporting structure independent of the engine hood.
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Specification