Segmented Acoustic Thermal Cover for Engine Noise and Heat
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing acoustic and thermal cover assemblies for internal combustion engines fail to adequately attenuate noise and shield components from heat, leading to discomfort for vehicle occupants and reduced service life of engine components.
Innovation Solution
An acoustic and thermal cover assembly with a first section featuring an acoustic and thermal shield made of heat-resistant materials and a second section with a plastic shell, both integrated with an insulating layer, positioned adjacent to the engine body to absorb noise and deflect heat, with the shield section offering enhanced heat shielding near the EGR pipe and the plastic shell providing reduced heat shielding in lower temperature areas.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If a combination of foam and plastic shell is positioned adjacent to the engine, then noise attenuation is improved, but heat shielding capability is insufficient
Solution Approach 1:
The cover assembly is divided into multiple sections: a first section with an acoustic and thermal shield for high-temperature areas near the EGR pipe, and a second section with a plastic shell for lower-temperature areas. This segmentation allows each section to be optimized for its specific thermal environment while collectively providing both noise attenuation and heat shielding.
Solution Approach 2:
Different materials and structures are applied to different locations based on local requirements. The first section uses heat-resistant materials with superior thermal barrier properties where high temperatures occur, while the second section uses standard plastic shell material where temperatures are lower, achieving optimal heat shielding where needed without unnecessary material usage elsewhere.
2Object-affected harmful factors
If a fiber mat is positioned adjacent to the engine, then heat shielding is improved, but noise attenuation is insufficient
Solution Approach 1:
The acoustic and thermal shield in the first section is constructed from composite materials that combine heat-resistant properties with acoustic absorption capabilities. This composite structure provides both superior heat shielding against the EGR pipe and effective noise attenuation, resolving the contradiction between thermal and acoustic performance.
3Object-affected harmful factors
If heat-resistant materials are used throughout the cover assembly, then heat shielding is improved, but material costs increase
Solution Approach 1:
Heat-resistant materials are applied only in the first section where high temperatures from the EGR pipe occur, while the second section uses cost-effective standard plastic shell material. This localized material selection achieves adequate heat shielding in critical areas while minimizing overall material costs and simplifying manufacturing.
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
The assembly effectively reduces engine noise and protects components from heat, improving passenger comfort and extending the service life of engine components while minimizing material costs by using materials with varying heat shielding properties based on proximity to the EGR pipe.
Implementation Method 1
an insulating layer positioned between cover and the engine body
Implementation Method 2
an acoustic and thermal shield extending along the first section... shield extending along the first section, a plastic shell extending along the second section
Data Source
AI summary
An internal combustion engine having an engine body and an acoustic and thermal cover assembly are provided. The engine body includes an exhaust gas recirculation (EGR) pipe extending therefrom and the acoustic and thermal cover assembly is positioned adjacent to the engine body. The acoustic and thermal cover assembly includes a first section and a second section extending along the engine body. The assembly further includes an acoustic and thermal shield extending along the first section, a plastic shell extending along the second section, the acoustic and thermal shield and plastic shell forming a cover, and an insulating layer positioned between the cover and the engine body.