Muffler Partition Wall and Reinforcing Plate Design
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Solution Overview
Problem
Existing mufflers face challenges in reducing radiated sound, improving strength, and minimizing weight, with single-shell press mufflers being lightweight but ineffective and double-shell press mufflers being costly and heavy.
Innovation Solution
A muffler design featuring a muffler body with a partition wall and reinforcing plates welded to the outer surface of the shell, dividing the inner space into chambers and enhancing structural integrity while reducing vibration amplitude.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of stationary object
If a single-shell press muffler is used, then weight is reduced and cost is lowered, but radiated sound increases and strength decreases
Solution Approach 1:
The single-shell muffler is segmented by adding partition walls that divide the inner space into multiple chambers, and reinforcing plates are added to specific locations to create a multi-functional structure that reduces radiated sound while maintaining light weight
Solution Approach 2:
Reinforcing plates are strategically positioned at specific locations on the shell (such as at chamber intersections or high-stress areas) rather than uniformly across the entire surface, providing localized strength enhancement and radiated sound reduction where most needed while minimizing additional weight
2Weight of stationary object
If a single-shell press muffler is used, then weight is reduced, but inner pressure strength decreases
Solution Approach 1:
The shell structure is segmented by adding reinforcing plates that create additional structural support zones, effectively dividing the stress distribution across multiple reinforcement points rather than relying on uniform shell thickness
Solution Approach 2:
Reinforcing plates are positioned at specific high-stress locations (such as where partition walls meet the shell or at geometric discontinuities) to provide localized strength enhancement exactly where inner pressure creates maximum stress concentrations
3Object-generated harmful factors
If a double-shell press muffler is used, then radiated sound is reduced and strength is improved, but weight increases and cost increases
Solution Approach 1:
Instead of using two complete shells, the invention segments the single shell by adding discrete partition walls and strategically positioned reinforcing plates, achieving the frictional damping and structural benefits of a double-shell design without the full weight penalty of a second complete shell
Solution Approach 2:
Reinforcing plates are positioned at specific locations on the single shell to create localized zones of enhanced mass and damping, providing radiated sound reduction equivalent to double-shell construction at key positions while leaving other areas as single-shell to minimize weight
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 effectively reduces radiated sound, enhances strength, and minimizes weight by dispersing strain concentration and reducing vibration amplitude without increasing weight or cost.
Implementation Method 1
reducing vibration amplitude
Implementation Method 2
welded on an outer surface of the shell
Implementation Method 3
effect of low radiated sound due to its frictional damping effect
Data Source
AI summary
A muffler for an engine includes a muffler body, at least one partition wall, and at least one reinforcing plate. The muffler body has an inner space formed by a shell. The partition wall includes a flange portion which is in tight contact with an inner surface of the shell, and the partition wall divides the inner space of the muffler body into a plurality of chambers. The reinforcing plate is welded on an outer surface of the shell at a position facing the flange portion of the partition wall.