Muffler Flat Lightweight Panel Sandwich Structure
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Solution Overview
Problem
Mufflers for internal combustion engine exhaust systems face challenges in achieving a lightweight construction while maintaining structural integrity and reducing noise emission due to vibrations, especially in constrained underbody spaces of vehicles.
Innovation Solution
The use of a flat lightweight panel with a sandwich structure for the muffler's housing, featuring an inner shell, outer shell, and a support structure, which provides high flexural rigidity and low weight, along with the option of gas-tight films for non-flat wall areas to minimize support functions and enhance gas-tightness, and a self-supporting framework structure to relieve the lightweight panels of support duties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a conventional solid housing is used to ensure structural integrity, then strength and stability are improved, but weight increases
Solution Approach 1:
The patent applies composite materials by using a sandwich structure consisting of an inner shell, outer shell, and support structure (such as honeycomb or cellular patterns). This composite construction provides high strength-to-weight ratio, ensuring structural integrity while significantly reducing the overall weight of the muffler housing compared to conventional solid materials.
Solution Approach 2:
The support structure within the sandwich panel employs porous or cellular patterns (honeycomb, cellular structures) that provide structural support through distributed voids. This porous architecture maintains strength and stiffness while minimizing material usage and weight, resolving the contradiction between structural integrity and weight reduction.
2Weight of stationary object
If a lightweight panel is used to reduce weight, then weight is reduced, but vibration resistance and stability worsen
Solution Approach 1:
The sandwich structure combines lightweight materials (inner and outer shells) with a rigid support structure (honeycomb or cellular pattern) to create a composite panel that resists vibration and maintains stability. The support structure acts as a rigid framework that prevents deformation under vibrational loads, ensuring the lightweight panel maintains the necessary stability and vibration resistance.
Solution Approach 2:
The cellular or honeycomb support structure within the lightweight panel provides rigidity and vibration resistance through its geometric pattern. The porous architecture distributes vibrational stresses across multiple cells, preventing localized deformation and maintaining overall structural stability while keeping the panel lightweight.
3Adaptability or versatility
If the muffler housing is made flat to fit underbody constraints, then adaptability to installation space is improved, but structural complexity increases
Solution Approach 1:
The muffler housing is segmented into modular components: a flat base panel and attachable wall sections. The flat base panel provides the primary mounting surface adapted to underbody constraints, while separate wall sections can be attached as needed. This segmentation allows the housing to be customized for different installation configurations without increasing overall structural complexity, as each module is simple in design but flexible in combination.
Solution Approach 2:
The flat base panel serves multiple functions: it provides the primary mounting surface for the muffler, acts as a structural support for attachable wall sections, and offers a standardized interface for various configurations. This multi-functionality reduces structural complexity by consolidating multiple roles into a single component, making the housing adaptable to different installation spaces without requiring complex custom designs for each scenario.
Data Source
AI summary
A muffler (1) for an exhaust system of an internal combustion engine, especially of a motor vehicle, has a housing (2), which encloses a muffler volume (7) and has at least one flat wall area (6), with at least one inlet tube (3) and with at least one outlet tube (4) and with at least one bracket (5) for fastening the muffler (1) to a holding structure. A lightweight construction is simplified if at least one wall section (11) of such a flat wall area (6) is formed by a flat lightweight panel (12) with sandwich structure.