Segmented Acoustic Cover for Engine Mounting
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Solution Overview
Problem
Existing acoustic protection covers for motor vehicle engines face challenges due to significant rigidity and fragility, leading to difficulties in mounting and a risk of breakage, especially when dimensional dispersions occur.
Innovation Solution
A modular acoustic protection cover design featuring a porous sound-absorbing shell with elastically deformable foam underlayers that can compress and recover, allowing the cover to deform and fit various engine geometries without rupture, combined with a bonding agent like thermosetting resin or thermoplastic, and optional features like interlayers and fastening means.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the shell is made with significant rigidity using a thermosetting resin bonding agent, then the acoustic protection performance is improved, but the shell becomes fragile and difficult to mount without breaking
Solution Approach 1:
The shell is divided into multiple parts that can move relative to each other, allowing the assembly to adapt to dimensional variations during mounting while maintaining the rigidity needed for acoustic protection when assembled
Solution Approach 2:
The bonding agent transitions from a rigid thermosetting resin to a more flexible formulation or application method that allows the shell parts to be assembled without breaking, while still providing sufficient structural integrity for acoustic protection
2Stability of the object's composition
If the shell is made with significant rigidity, then the structural integrity is improved, but the risk of breakage during mounting increases
Solution Approach 1:
Dividing the shell into multiple parts reduces the risk of complete failure during mounting, as individual parts can flex independently rather than the entire structure being rigid and prone to catastrophic breakage
Solution Approach 2:
The design anticipates potential breakage risks by incorporating flexibility into the assembly process, allowing the shell parts to accommodate dimensional variations before final assembly, thereby preventing breakage before it occurs
3Ease of manufacture
If the shell has dimensional dispersions from nominal geometric definition, then manufacturing flexibility is improved, but mounting difficulties increase
Solution Approach 1:
The shell is divided into multiple parts that can move relative to each other, allowing the assembly to absorb dimensional variations from manufacturing tolerances while still achieving proper fit during mounting
Solution Approach 2:
The shell parts are designed to be movable relative to each other during assembly, allowing dynamic adjustment to accommodate dimensional dispersions from manufacturing, rather than requiring precise static fit
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Facilitates easier mounting on engines with dimensional variations while preventing shell rupture, enhancing acoustic protection through a 'mass-spring' principle and maintaining sound absorption performance.
Implementation Method 1
a sub-layer 4 of associated foam on the back of said shell over substantially its entire surface... said underlayer is based on elastically deformable foam... so that said cover can deform elastically
Implementation Method 2
a porous sound-absorbing shell based on fibers interconnected by a bonding agent
Data Source
AI summary
The invention concerns a cover (1) comprising a porous sound-absorbing shell (3) made from fibres linked together by a bonding agent and a foam sub-layer (4) associated with the back of said shell over substantially the entire surface of same, said shell comprising two parts (5a, 5b, 5c) arranged edge-to-edge so as to be able to move relative to each other, said sub-layer being made from elastically deformable foam and extending between said parts, such that said cover can be elastically deformed, in order to facilitate the assembly of same onto said engine while avoiding breaking said shell.