Vehicle Muffler Bracket Mountain Shape Diffusion
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Solution Overview
Problem
Existing vehicle mufflers face challenges in reducing noise without increasing the volume of the expansion chamber, as increasing the chamber's volume is difficult due to mounting space constraints, and current solutions fail to effectively suppress radiation sound caused by exhaust gas vibrations.
Innovation Solution
A muffler design featuring a bracket with a mountain shape on the inner surface of the expansion chamber, inclining from the top surface toward the corners, which diffuses exhaust gas evenly and increases sound reduction without expanding the chamber volume, while also enhancing the rigidity of end plates to suppress radiation sound.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the volume of the expansion chamber is increased to increase sound reduction, then the amount of sound reduction is improved, but the mounting space requirement increases
Solution Approach 1:
The patent applies local quality by creating a mountain-shaped bracket with specific geometric features (peak position, slope angles, extension length) at a localized position within the expansion chamber. This localized structural modification changes the flow characteristics and sound reduction properties in that specific region without requiring overall chamber expansion, thereby achieving improved sound reduction within constrained volume.
Solution Approach 2:
The patent introduces a three-dimensional mountain-shaped bracket structure that protrudes into the expansion chamber from the inner wall. This adds a new spatial dimension to the flow path and sound wave interaction, creating complex flow patterns and enhancing sound reduction through multi-dimensional turbulence and reflection without increasing the chamber's external volume.
2Object-generated harmful factors
If a plate member with projection and recesses is attached to increase rigidity and suppress radiation sound, then the radiation sound is suppressed, but the device complexity increases
Solution Approach 1:
The patent merges the bracket structure with the end plate by forming an integrated mountain-shaped bracket that is attached to the inner surface of the end plate. This combination serves dual functions: the bracket structure suppresses radiation sound through its geometric configuration while simultaneously reinforcing the end plate's rigidity, eliminating the need for separate reinforcement components and reducing overall device complexity.
Solution Approach 2:
The mountain-shaped bracket serves multiple functions: it acts as a flow diffuser to reduce turbulence, provides structural reinforcement to the end plate to suppress vibration, and creates specific flow patterns to minimize radiation sound. This multi-functionality reduces the need for additional components and simplifies the overall muffler design.
3Object-affected harmful factors
If the bracket extends over the center line to diffuse exhaust gas to corners, then the sound reduction is improved, but the bracket length increases
Solution Approach 1:
The patent positions the peak of the mountain-shaped bracket at a specific location that is offset from the center line toward the inlet pipe side. This preliminary positioning strategically directs the exhaust flow toward the corners of the expansion chamber before the flow reaches the outlet, achieving effective flow diffusion and sound reduction with a more compact bracket configuration that does not need to extend symmetrically across the entire chamber.
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 design effectively increases sound reduction and suppresses radiation sound without increasing the expansion chamber's volume, enhancing noise reduction for vehicles by diffusing exhaust gases and reducing end plate vibrations.
Implementation Method 1
the exhaust gas flowing into the expansion chamber from the inlet pipe can be introduced to the corner of the expansion chamber along the inclined surface of the bracket, and, consequently, the exhaust gas can be diffused to an entire region of the expansion chamber
Implementation Method 2
by forming the closed cross-sectional structure by the bracket and the end plate, it is possible to increase the rigidity of the end plate, and to consequently suppress vibration of the end plate and to reduce the radiation sound
Implementation Method 3
the exhaust gas from the inlet pipe can be caused to contact an end plate in an inclined manner, and thus, it is possible to suppress generation of the radiation sound due to vibration of the end plate caused by a dynamic pressure of the exhaust gas
Data Source
AI summary
A muffler for a vehicle includes a first expansion chamber in which an exhaust gas flowing in from an inlet pipe is expanded, and a bracket that is placed on an inner surface of the first expansion chamber to oppose a blow-off port of the inlet pipe and that has a mountain shape protruding toward a side of the inlet pipe. The bracket includes a top surface which opposes the blow-off port of the inlet pipe, and inclined surfaces which incline from the top surface toward corners of the first expansion chamber.