Muffler Partition Wall Suppresses Whistling Noise
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Solution Overview
Problem
Conventional mufflers for internal combustion engines in vehicles suffer from abnormal noise issues like whistling sounds due to pressure fluctuations between the tail pipe and tail cover, which are difficult to suppress without compromising design aesthetics or making exhaust gas sampling inspections cumbersome.
Innovation Solution
A muffler design featuring a partition wall that compartmentalizes the space between the tail pipe and tail cover into multiple sections, reducing the volume affected by pressure fluctuations and incorporating a pipe-shaped partition wall for easier manufacturing and noise suppression, along with a fold portion to prevent air from being directly affected by pressure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the tail pipe is extended more rear than the tail cover, then abnormal noise is suppressed, but the rear end portion of the tail pipe is exposed from the tail cover, unsatisfying design requirements
Solution Approach 1:
The space between the tail pipe and tail cover is segmented into multiple independent spaces by partition walls. This segmentation reduces the volume of each individual space, thereby suppressing abnormal noise while allowing the tail pipe to remain shorter than the tail cover for better design appearance.
2Object-affected harmful factors
If the gap between the tail cover and tail pipe is narrowed to prevent abnormal noise, then noise suppression is improved, but it becomes difficult to insert a tube for exhaust gas sampling inspection
Solution Approach 1:
The gap space is divided into multiple smaller spaces by partition walls. This segmentation reduces the volume of air affected by pressure fluctuations, suppressing abnormal noise while maintaining sufficient gap width for tube insertion during exhaust gas sampling inspection.
3Shape
If the tail pipe rear edge is positioned more front than the tail cover rear edge, then design is improved by preventing exposure, but pressure fluctuation becomes larger
Solution Approach 1:
By dividing the space into multiple smaller spaces using partition walls, the volume of air subjected to pressure fluctuation is reduced. This allows the tail pipe to be positioned more front for better design while the segmented structure mitigates the impact of pressure fluctuations.
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
Effectively suppresses abnormal noise occurrences while allowing for smooth exhaust gas sampling inspections and improving muffler design by reducing pressure fluctuation impact, simplifying manufacturing, and enhancing noise reduction without exposing the tail pipe.
Implementation Method 1
a partition wall (24) disposed in a space (23) formed between the tail pipe (21) and the tail cover (22)... making a volume of a space affected by pressure fluctuation at an exhaust time smaller... suppress an occurrence of an abnormal noise such as a whistling sound
Data Source
AI summary
A muffler (16) of an internal combustion engine is characterized in having a muffler main body (18) connected to a rear end of an exhaust pipe of the internal combustion engine, a tail pipe (21) extended from a rear end surface (20)of the muffler main body, and a tail cover (22) covering an outer periphery of the tail pipe, the muffler comprises a partition wall (24) compartmentalizing a space (23) formed between the tail pipe and the tail cover into at least two or more spaces (34, 35).