Compact Muffler Structure Using Integrated Resonator for Saddle-Type Vehicles
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Solution Overview
Problem
The existing muffler structures for saddle-type vehicles are complex and large, making it difficult to achieve a simple and compact design while maintaining effective muffling performance.
Innovation Solution
A muffler structure featuring a cylindrical portion with a reduced diameter portion and an expansion chamber formed by the space near the tail pipe, where the pipe includes a center pipe passing through the cylindrical portion and a tail pipe in the reduced diameter portion, allowing for efficient diffusion of exhaust gas and improved appearance performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a separator and multiple communication pipes are used to divide the inner part of the muffler into multiple spaces, then the muffling effect is improved, but the structure becomes complicated and the size increases
Solution Approach 1:
The patent merges the separator and multiple communication pipes into a single integrated resonator structure. The resonator includes a resonant chamber and communication passages that directly connect the inlet to the resonant chamber, eliminating the need for separate separators and multiple pipes while maintaining the muffling effect through resonance principles
Solution Approach 2:
The resonator serves multiple functions simultaneously: it acts as both the separator and the communication pathway for exhaust gases. The resonant chamber provides both the separation function and the muffling function through acoustic resonance, reducing the overall number of components needed
2Reliability
If a separator and multiple communication pipes are used to divide the inner part of the muffler into multiple spaces, then the muffling effect is improved, but the size of the muffler increases
Solution Approach 1:
The patent merges the separator and multiple communication pipes into a single integrated resonator structure. The resonator includes a resonant chamber and communication passages that directly connect the inlet to the resonant chamber, eliminating the need for separate separators and multiple pipes while maintaining the muffling effect through resonance principles
Solution Approach 2:
The communication passages are nested within the resonator structure, with the inlet passage and outlet passage integrated into the resonant chamber. This nesting arrangement allows the communication pathways to be contained within the overall resonator volume, reducing the total muffler size
3Device complexity
If a simple and compact muffler structure is adopted, then the size and complexity are reduced, but the muffling effect may be compromised
Solution Approach 1:
The patent changes the geometric parameters of the resonator, including the cross-sectional area of the resonant chamber and the dimensions of the communication passages. By optimizing these parameters, the resonator achieves effective muffling at a compact size, maintaining the muffling effect while simplifying the overall structure
Solution Approach 2:
The resonator utilizes acoustic resonance and vibration principles to achieve muffling. The resonant chamber is designed to resonate at specific frequencies, creating acoustic interference that reduces noise. This allows a simple structure to achieve effective muffling through controlled vibration and resonance phenomena
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 enables a simple and compact muffler design while maintaining effective muffling performance, reducing weight and manufacturing costs, and enhancing appearance by utilizing the space around the tail pipe as an expansion chamber.
Implementation Method 1
an expansion chamber is formed by a space in the reduced diameter portion in the vicinity of the tail pipe
Data Source
AI summary
There is provided a muffler structure of a saddle-type vehicle. The muffler structure is disposed at a downstream side of an exhaust pipe extending from an exhaust port of a cylinder head. A pipe is connected to the exhaust pipe and inserted into a muffler main body. The muffler main body includes a cylindrical portion and a reduced diameter portion joined to a downstream side end portion of the cylindrical portion and having a diameter reduced toward the downstream side thereof. The pipe includes a center pipe passing through the cylindrical portion, and a tail pipe disposed in the reduced diameter portion. An expansion chamber is formed by a space in the reduced diameter portion in the vicinity of the tail pipe.