Vehicle Muffler with Front-Positioned Main Chamber and Variable Valve
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Solution Overview
Problem
Conventional muffler installations at the rear of vehicles face challenges in minimizing oscillation booming noises due to limited space and interference with other vehicle components, leading to increased noise loss and difficulty in noise reduction.
Innovation Solution
A muffler design where the main muffler is positioned in front of the rear suspension, featuring a plurality of baffles dividing the interior into chambers, an inlet pipe, a discharge pipe, and a variable valve that opens based on exhaust gas back pressure, along with glass wool and punched holes to manage noise frequencies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the main muffler is installed at the rear side of the vehicle, then the installation position is determined based on limited lower structure, but the oscillation booming noise cannot be minimized and insertion loss worsens
Solution Approach 1:
The patent inverts the conventional installation position by placing the main muffler in front of the rear suspension instead of at the rear side of the vehicle. This inversion allows the exhaust pipe to pass through the muffler at an optimized angle, improving noise reduction performance while avoiding interference with the fuel tank and suspension components.
2Ease of manufacture
If the main muffler is positioned at the rear side of the vehicle, then the installation is simplified, but the volume is limited and booming noises increase
Solution Approach 1:
The patent changes the spatial dimension of muffler installation by positioning it in front of the rear suspension rather than at the rear end. This dimensional change in installation location provides additional space, increasing the muffler volume from the conventional limited rear space to a larger volume that can be accommodated in the front region near the suspension.
3Device complexity
If the main muffler is installed at the rear side, then the structure is simplified, but interference with fuel tank and suspension occurs
Solution Approach 1:
The patent extracts the main muffler from the conventional rear installation position and relocates it to the front of the rear suspension. This extraction from the problematic rear position eliminates interference with the fuel tank and suspension components while maintaining structural simplicity through the straightforward repositioning of the muffler and its connecting pipes.
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 increases the muffler volume, reduces booming noises, and effectively minimizes high-frequency flow-induced noises by optimizing exhaust gas flow and pressure management.
Implementation Method 1
a variable valve selectively opened or closed in response to a back pressure of the exhaust gas from an outlet port of the intermediate pipe
Implementation Method 2
glass wool and punched holes to manage noise frequencies
Implementation Method 3
a first array of punched holes, a second array of punched holes and a third array of punched holes may be formed on an outer circumferential surface of the inlet pipe
Data Source
AI summary
A muffler for a vehicle may include a main muffler in front of a rear suspension when viewing from a front of the vehicle, a plurality of baffles dividing an interior of the main muffler into a plurality of chambers, an inlet pipe installed substantially at an center of one side of the main muffler and passing through the plurality of the baffles, a discharge pipe installed at a lower side of the other side of the main muffler and passing through the plurality of the baffles, wherein the discharge pipe exhausts an exhaust gas flowed in the inlet pipe to an exterior of the main muffler, an intermediate pipe in fluidic communication with an outlet port of the inlet pipe, and a variable valve selectively opened or closed in response to a back pressure of the exhaust gas from an outlet port of the intermediate pipe.