Exhaust Muffler Holding Member Positioning
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Solution Overview
Problem
Conventional exhaust mufflers with foamed ceramic materials face challenges in enhancing muffling effects due to resistance in the flow of exhaust gas from the inner cylinder to the muffling member, which is exacerbated by holding members between the muffling and porous wall portions, limiting the muffling performance.
Innovation Solution
The exhaust muffler design includes an outer cylinder with an introduction chamber and a muffling member made of foamed ceramic material, where the inner cylinder has a porous wall portion with communication holes, and the holding member is positioned to avoid overlapping with the porous wall, allowing improved gas flow and reduced pressure loss, while the muffling member is supported by the inner cylinder to enhance stability and reduce weight.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a holding member is provided between the muffling member and the porous wall portion to support the muffling member, then the muffling member is supported stably, but the flow of exhaust gas from the inner cylinder to the muffling member is resisted, making it difficult to enhance the muffling effect
Solution Approach 1:
The invention extracts the holding member from the exhaust gas flow path by positioning it in a region that does not overlap with the porous wall portion axially. This allows the exhaust gas to flow freely from the inner cylinder through the porous wall portion to the muffling member without resistance from the holding member, while the holding member still provides stable support for the muffling member.
Solution Approach 2:
The invention resolves the spatial conflict between the holding member and porous wall portion by utilizing the axial dimension. The holding member is positioned in an axial region distinct from where the porous wall portion is located, allowing both components to coexist without interfering with each other's functions - the holding member provides support while the porous wall portion maintains unobstructed gas flow.
2Productivity
If the holding member is positioned to avoid overlapping with the porous wall portion, then exhaust gas flow is improved and pressure loss is reduced, but the structural complexity increases
Solution Approach 1:
The inner cylinder structure is designed to serve multiple functions: it provides the exhaust gas flow path, contains the porous wall portion for gas distribution, and positions the holding member to support the muffling member. By integrating these functions into a unified structural design, the patent avoids adding separate complex support mechanisms while maintaining improved gas flow characteristics.
3Object-generated harmful factors
If a foamed ceramic material is used as the muffling member, then a high muffling effect and light weight are achieved, but the resistance to impact forces is low
Solution Approach 1:
The patent creates an asymmetric spatial arrangement where the holding member is positioned in a region that does not overlap with the porous wall portion axially. This asymmetric positioning allows the lightweight foamed ceramic muffling member to be supported without requiring it to have high impact resistance, as the holding member bears the mechanical load while the muffling member focuses on its noise reduction function.
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
This configuration enhances the muffling effect by improving exhaust gas flow through the foamed ceramic material, stabilizing the muffling member with low resistance to impact forces, and reducing weight by allowing a lightweight outer wall and improved protection performance.
Implementation Method 1
a porous wall portion provided with communication holes communicating an inside and an outside of the inner cylinder
Implementation Method 2
the muffling member of a foamed ceramic material is arranged around the cylindrical member and exhaust gas is positively caused to flow from within the cylindrical member into and through the muffling member of the foamed ceramic material, to provide a sound absorbing effect
Data Source
AI summary
An exhaust muffler has an outer cylinder into which an exhaust gas from an engine is introduced and a muffling member made of a foamed ceramic material. The outer cylinder has an inner cylinder through which the exhaust gas passes, a part of the muffling member is supported by an outer wall of the inner cylinder via a holding member. The inner cylinder includes, in an area where the inner cylinder overlaps with the muffling member with respect to axial direction of the inner cylinder, a porous wall portion formed with communication holes communicating an inside and an outside of the inner cylinder. The holding member is arranged at a position where it does not overlap with a part of the porous wall portion, so that muffling effect is enhanced, and the muffling member having a low resistance to impact forces can be supported stably by the inner cylinder.