T-Shaped Baffle Silencer Layout for Exhaust Vibration
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing engine exhaust devices with box-shaped silencers have limited degree of freedom in layout and arrangement of expansion chambers, leading to insufficient exhaust gas expansion and reduced silencing effect due to small front-rear lengths of expansion chambers.
Innovation Solution
The engine exhaust device employs a T-shaped baffle plate to divide the internal space of the silencer into three expansion chambers, with one chamber having a larger capacity than the others, allowing exhaust gas to expand and attenuate energy effectively, while maintaining sufficient distances between the exhaust pipe and partition walls to reduce vibration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If expansion chambers are arranged in the front-rear direction with partition walls, then the silencer structure is simplified, but the front-rear lengths of expansion chambers become small reducing exhaust gas expansion and silencing effect
Solution Approach 1:
The patent transitions from a one-dimensional front-rear arrangement of expansion chambers to a two-dimensional layout by introducing partition walls that extend in the left-right direction. This allows expansion chambers to be arranged both in the front-rear and left-right directions, increasing the degree of freedom of layout and enabling sufficient front-rear lengths for effective exhaust gas expansion while maintaining a compact overall structure.
2Adaptability or versatility
If partition walls are placed close together to fit components, then the degree of freedom of layout increases, but exhaust gas does not expand sufficiently reducing silencing effect
Solution Approach 1:
The patent resolves this contradiction by utilizing two-dimensional spatial arrangement with partition walls extending in multiple directions. This enables expansion chambers to be compact in the left-right direction (increasing layout freedom) while maintaining sufficient length in the front-rear direction (preserving silencing effect), as exhaust gas flows primarily in the front-rear direction through the expansion chambers.
3Adaptability or versatility
If expansion chambers are made compact, then component arrangement flexibility increases, but surface area of expansion chambers decreases reducing sound attenuation
Solution Approach 1:
The patent achieves this balance by arranging expansion chambers in a two-dimensional configuration where they can be compact in the left-right direction (providing component arrangement flexibility) while maintaining adequate surface area in the front-rear direction (ensuring sound attenuation). The partition walls are positioned to optimize both compactness and surface area exposure to exhaust gas flow.
4Volume of stationary object
If exhaust pipe is positioned close to partition walls, then space utilization improves, but vibration of partition walls increases
Solution Approach 1:
The patent applies this principle by creating asymmetric positioning of the exhaust pipe relative to the partition walls. The exhaust pipe is positioned at a specific distance from the partition walls to balance space utilization with vibration suppression. The partition walls are designed with sufficient spacing from the exhaust pipe in critical areas to reduce vibration while maintaining compact overall dimensions for efficient space utilization.
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 silencing effect by reducing the surface area of the expansion chambers, increasing the degree of freedom in layout and arrangement of components, and suppressing vibration of partition walls, resulting in improved sound attenuation.
Implementation Method 1
The plural divisional spaces constitute respective expansion chambers where to expand exhaust gas
Implementation Method 2
another one of the at least two spaces is larger in capacity than each of the two spaces defined by the second partition wall; and a downstream end of the exhaust pipe is open in the another one of the at least two spaces
Data Source
AI summary
An engine exhaust device includes an exhaust pipe attached to a vehicle engine and a silencer connected to a downstream side of the exhaust pipe; the silencer includes a first partition wall which partitions an internal space of the silencer into at least two spaces in a first direction and a second partition wall which partitions one of the at least two spaces into two spaces in a second direction that crosses the first direction; another one of the at least two spaces is larger in capacity than each of the two spaces defined by the second partition wall; and a downstream end of the exhaust pipe is open in the another one of the at least two spaces.