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Sound protection screen for motor vehicle engine compartment

A technology for engine compartments and motor vehicles, applied to vehicle parts, applications, household components, etc., can solve problems such as high cost and high cost of injection molding equipment

Pending Publication Date: 2021-10-29
TREVES PROD SERVICES & INNOVATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] the shell has a high cost, taking into account the amount of material involved (the shell may notably have a thickness of typically 2-3 mm) and the very high cost of injection molding equipment,

Method used

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  • Sound protection screen for motor vehicle engine compartment
  • Sound protection screen for motor vehicle engine compartment

Examples

Experimental program
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Embodiment Construction

[0034] An acoustic screen 1 for an engine compartment of a motor vehicle is now described with reference to the accompanying drawings, said screen comprising:

[0035] Molded thermoplastic material base outer shell 2,

[0036] · Elastically compressible molded polyurethane foam based inner bottom layer 3,

[0037] The screen also has the following characteristics:

[0038] the bottom layer is bonded to the back of the shell by overmolding,

[0039] the shell is based on a thermoformed sheet of thermoplastic material,

[0040] the shell has a thickness of 0.2-1 mm,

[0041] The shell optionally:

[0042] or a double shell with a polyolefin-based outer layer 4 provided on the bottom layer side with bonding to the bottom layer in order to enable bonding between the shell and the bottom layer A thermoplastic material backing layer 5 on the foam,

[0043] • Or a single-layer shell, said shell being based on polyolefin, said back side having a surface treatment capable of impr...

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Abstract

The invention relates to a screen (1) comprising: an external shell (2) based on a moulded thermoplastic material; an internal sub-layer (3) based on resiliently compressible moulded polyurethane foam, said sub-layer being associated with the rear side of said shell by over-moulding, the shell being based on a sheet of thermoformed thermoplastic material, said shell having a thickness between 0.2 and 1 mm, said shell optionally being: either a two-layered shell, said shell having an external layer (4) based on polyolefin, said external layer being provided at the side of said sub-layer, in order to allow adhesion between said shell and said sub-layer, with a rear layer (5) based on a thermoplastic material that adheres to said foam, or a single-layered shell, said shell being based on polyolefin, said rear side being subjected to a surface treatment that allows the adhesion to the sub-layer to be improved.

Description

technical field [0001] The invention relates to an acoustic screen for an engine compartment of a motor vehicle and to a montage of said screen. Background technique [0002] It is known to manufacture acoustic screens for motor vehicle engine compartments, said screens comprising: [0003] a base shell made by injection molding of thermoplastic material based especially on polyolefins for good fluid resistance, [0004] • An elastically compressible base layer of molded polyurethane foam discontinuously secured to the inner face of the shell, for example by bouterolles. [0005] This bottom layer makes it possible to provide sound insulation at the same time by absorption due to its porous structure and also by separating the shell from the external support arranged in the nacelle on which the screen is mounted. [0006] With regard to this shell, it makes it possible to provide, thanks to its airtightness: [0007] - sound insulation, [0008] -Protects the underlying ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B60R13/08B29C51/00B32B7/12B32B27/32B32B5/20
CPCB29C51/00B29L2007/002B29L2031/721B29L2031/3005B29C51/14B60R13/0838B60R2013/0807B32B27/16B32B3/08B32B5/02B32B27/34B32B2307/732B32B2307/51B32B2307/5825B32B27/302B32B5/022B32B27/32B32B2270/00B32B2307/10B32B27/40B32B2307/738B32B27/365B32B2307/72B32B3/266B32B27/36B32B2307/56B32B2605/00B32B27/12B32B27/065B32B5/20B32B2266/0278B32B2307/7265B32B27/304B32B27/08B32B2250/03B32B2250/04B32B2250/24
Inventor M·波蒂埃S·理贝斯
Owner TREVES PROD SERVICES & INNOVATION