Muffler Resonance Chambers for Low-Frequency Noise Reduction
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Solution Overview
Problem
The existing automotive exhaust system mufflers often have insufficient capacity in the space functioning as a branch pipe, leading to inadequate reduction of sound waves with certain frequencies.
Innovation Solution
A muffler configuration featuring a cylindrical exhaust pipe with closed spaces formed between the pipe and a space forming member, which communicate via a single communication hole, allowing for increased capacity and effective muffling of sound waves by functioning as resonance chambers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a double pipe structure with a space between inner pipe and outer pipe is used, then the structure is simple, but the space capacity is deficient and muffling capability is insufficient
Solution Approach 1:
The patent applies nesting by placing multiple closed spaces within the annular space between the inner and outer pipes. Each closed space is positioned at different angular positions around the inner pipe, creating a nested configuration where multiple resonance chambers occupy the available volume efficiently. This resolves the contradiction by maximizing the use of the annular space to provide sufficient total capacity while maintaining the simple double-pipe overall structure.
2Volume of moving object
If the space between inner pipe and outer pipe functions as a branch pipe, then the structure is compact, but the capacity is likely to be deficient
Solution Approach 1:
The patent segments the annular space into multiple closed spaces by dividing it angularly. Instead of having one large continuous space, the annular region is partitioned into several smaller closed spaces positioned at different angular locations. Each closed space communicates with the inner pipe through its own communication hole. This segmentation allows the total effective capacity to be increased while maintaining a compact overall muffler size, as the spaces are distributed within the annular region rather than requiring a single large volume.
3Reliability
If multiple closed spaces are arranged in radial or circumferential direction, then the capacity is increased, but the arrangement complexity increases
Solution Approach 1:
The patent merges the functions of multiple closed spaces into a unified structure where all closed spaces are contained within the annular region between the inner and outer pipes. The outer pipe serves as a common boundary for all closed spaces, and the inner pipe serves as the common communication path. This merging approach increases capacity through multiple spaces while avoiding arrangement complexity by maintaining a regular annular geometry rather than irregular distributed positioning.
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 capability of sound waves with specific frequencies, enabling a more efficient reduction of noise caused by exhaust gases, particularly low-frequency sounds.
Implementation Method 1
The closed spaces function as resonance chambers. The capacity of the space, which functions as the branch pipe, can be easily reserved by providing the closed spaces, and thus a capability of muffling sound waves with the certain frequency can be improved.
Implementation Method 2
a capability of muffling sound waves with the certain frequency can be improved
Data Source
AI summary
One aspect of the present disclosure provides a muffler including an exhaust pipe and a space forming member. The exhaust pipe has a cylindrical shape having a flow passage inside through which exhaust gas passes. The space forming member forms closed spaces between itself and the exhaust pipe, the closed spaces being branched from the flow passage and adjacent to the flow passage. Each of the closed spaces and the flow passage communicate with one another via a single communication hole.