Saddle-Type Vehicle Muffler Expansion Chamber Diffusion
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Solution Overview
Problem
The existing muffler structures for saddle-type vehicles are complex and heavy due to the number of constituent elements and communication pipes, making it difficult to achieve a simple and lightweight design while maintaining a sufficient muffling effect.
Innovation Solution
A muffler structure featuring a pipe with an expansion chamber having a larger inner diameter than the exhaust pipe, inserted into the muffler main body, and through holes on the outer peripheral surface of the expansion chamber to diffuse exhaust gas, reducing the need for multiple expansion chambers and components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a separator and multiple communication pipes are used to divide the muffler into multiple spaces, then the muffling effect is improved, but the device complexity and weight increase
Solution Approach 1:
The patent divides the muffler internal space into multiple chambers (first expansion chamber, second expansion chamber, and communication chamber) using partition walls. This segmentation allows exhaust gases to flow through multiple paths and chambers, enhancing the muffling effect by creating interference patterns and extending the exhaust path length without requiring complex external pipe structures.
Solution Approach 2:
The patent employs a nested structure where the first and second expansion chambers are positioned concentrically or adjacently within the muffler body, with partition walls creating nested chambers. The communication pipes connect these nested chambers, allowing compact arrangement that reduces overall muffler size while maintaining effective muffling through multiple expansion and communication stages.
2Reliability
If a separator and multiple communication pipes are used to divide the muffler into multiple spaces, then the muffling effect is improved, but the weight of the muffler increases
Solution Approach 1:
The muffler is segmented into functional chambers (expansion chambers and communication chamber) separated by partition walls. This segmentation creates multiple reflection and expansion points for exhaust waves, improving muffling effectiveness. The segmented design allows for optimized material distribution, using thinner walls in non-critical areas to reduce overall weight while maintaining structural integrity for effective sound cancellation.
Solution Approach 2:
The nested chamber arrangement allows multiple expansion chambers to be positioned within a compact outer envelope, reducing the overall volume and weight of the muffler. By nesting chambers concentrically or adjacently, the patent achieves effective multi-stage muffling without requiring a large, heavy structure, as the chambers share common walls and space.
3Reliability
If multiple expansion chambers and communication pipes are used, then the muffling effect is improved, but the manufacturing cost and material usage increase
Solution Approach 1:
The muffler is constructed by dividing the internal space into segments (first expansion chamber, second expansion chamber, communication chamber) using partition walls. These partition walls serve dual purposes: they create the necessary chamber segmentation for effective muffling and act as structural support elements. This approach allows the muffler to be manufactured as a single integrated component or in fewer pieces, reducing assembly complexity and manufacturing cost while achieving the desired multi-chamber muffling effect.
Solution Approach 2:
The partition walls in the patent serve multiple functions simultaneously: they divide the muffler into separate chambers, provide structural support, and act as reflection surfaces for sound waves. By making the partition walls multi-functional, the patent eliminates the need for separate components for each function, reducing the total number of parts, simplifying manufacturing, and lowering material costs while maintaining effective muffling performance.
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 achieves a simple and lightweight muffler structure while providing a sufficient muffling effect by diffusing exhaust gas within the expansion chamber and muffler main body, reducing weight and material costs, and preventing increased pressure loss.
Implementation Method 1
a plurality of through holes are formed on an outer peripheral surface of the expansion chamber disposed in the muffler main body
Implementation Method 2
at least a part of the expansion chamber is disposed in the muffler main body, and a plurality of through holes are formed on an outer peripheral surface of the expansion chamber disposed in the muffler main body
Implementation Method 3
the pipe is provided with an expansion chamber having an inner diameter that is larger than an inner diameter of the exhaust 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 pipe is provided with an expansion chamber having an inner diameter that is larger than an inner diameter of the exhaust pipe. At least a part of the expansion chamber is disposed in the muffler main body, and a plurality of through holes are formed on an outer peripheral surface of the expansion chamber disposed in the muffler main body.