Multi-layer Acoustic Thermal Insulation Capsule for Engine Noise Heat
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Solution Overview
Problem
Current sound and thermal insulation solutions for internal combustion engines in vehicles lack a combined capsule effect, leading to inefficiencies in noise reduction and heat management, particularly due to the use of individual components with no intentional coupling of acoustic and thermal insulation, which affects fuel consumption and environmental compatibility.
Innovation Solution
A multi-layer acoustically and thermally effective insulation system comprising at least three layers with varying flow resistances and thicknesses, including an air gap for mechanical decoupling, and optionally featuring micro-perforated metal foils for enhanced heat reflection, to create a thermally and acoustically closed space around the engine.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If individual sound insulations are installed separately without intentional coupling, then installation flexibility is improved, but acoustic and thermal insulation effectiveness deteriorates
Solution Approach 1:
The patent combines multiple individual sound insulations into a single integrated capsule structure that encloses the internal combustion engine. This merging approach maintains installation flexibility while significantly improving acoustic and thermal insulation effectiveness by creating a unified barrier that prevents noise and heat transmission more efficiently than separate components.
Solution Approach 2:
The capsule is constructed using composite material structures that integrate different insulation materials with varying flow resistances. This composite approach allows the single component to address multiple harmful factors (noise and heat) simultaneously while maintaining ease of installation as one pre-assembled unit.
2Object-affected harmful factors
If multiple layers with different flow resistances are used, then acoustic absorption is improved, but structural complexity increases
Solution Approach 1:
The capsule incorporates multiple layers with different flow resistances segmented into specific positions: a first layer with flow resistance of 50-150 kNs/m⁴, a second layer with 200-600 kNs/m⁴, and optionally a third layer. This segmentation of acoustic absorption functions into distinct layers improves sound pressure level reduction while the entire multi-layer structure is pre-integrated into a single capsule, managing structural complexity through modular design.
Solution Approach 2:
Different layers are positioned at specific locations within the capsule based on their flow resistance characteristics. The first layer faces the engine block, the second layer is positioned to handle mid-range frequencies, and the third layer (when present) addresses higher frequencies. This local optimization of material properties at different positions maximizes acoustic absorption effectiveness while maintaining a manageable overall structure.
3Object-affected harmful factors
If an air gap is introduced for mechanical decoupling, then vibration transmission is reduced, but thermal insulation effectiveness may deteriorate
Solution Approach 1:
The air gap acts as an intermediary element between the engine block and the first insulation layer, providing mechanical decoupling that reduces vibration and structure-borne noise transmission. Meanwhile, the capsule's enclosed structure and multi-layer insulation materials compensate for the thermal insulation effect of the air gap, ensuring that engine warm-up behavior remains optimal by trapping heat within the capsule while still allowing mechanical vibration isolation.
4Object-affected harmful factors
If the engine is completely encapsulated, then acoustic and thermal insulation are improved, but fuel consumption increases
Solution Approach 1:
The capsule serves multiple functions simultaneously: it provides acoustic insulation to reduce noise transmission, thermal insulation to maintain engine temperature, and mechanical decoupling through the air gap to reduce vibration. This multi-functionality allows a single encapsulation structure to address multiple harmful factors (noise, heat loss, vibration) without requiring separate systems, thereby minimizing the overall impact on fuel consumption while achieving comprehensive insulation effectiveness.
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 solution significantly reduces sound pressure levels inside and outside the vehicle, improves engine warm-up behavior, and achieves a balanced reduction in fuel consumption and emissions, with the potential to lower fuel consumption by 9-16% while maintaining optimal engine temperature regulation.
Implementation Method 1
a multi-layer acoustically and thermally effective insulation comprising at least three layers which are connected to one another over their entire surface and have different flow resistances
Implementation Method 2
with an air gap with a thickness of at least 1 mm, a layer in contact with it
Implementation Method 3
optionally featuring micro-perforated metal foils for enhanced heat reflection
Data Source
Figure 1
Figure 2~4
AI summary
The invention relates to a multi-layered acoustically and thermally effective insulation with a defined layer structure, in particular for internal combustion engines of motor vehicles.