Active Muffler Diaphragm Drive Thermal Coupling
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Solution Overview
Problem
Existing active exhaust mufflers face challenges in effectively cooling heat-sensitive antinoise generators due to complex and costly cooling designs, which can lead to thermal stress and reduced lifespan.
Innovation Solution
A heat-conducting coupling element connects the diaphragm drive of the antinoise generator to an outside wall, facilitating heat transfer while preventing sound transmission, using materials like heat-conducting pastes or pads that also provide mechanical elasticity to maintain a small gap and reduce noise transfer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a cooling gap or cooling channel is designed to cool the antinoise generator, then cooling effectiveness is improved, but device complexity and manufacturing cost increase
Solution Approach 1:
The patent extracts the cooling function from a complex dedicated cooling system and implements it through a simple thermal coupling element that connects the antinoise generator housing to the exhaust pipe, utilizing the exhaust pipe's thermal mass and surface area for passive heat dissipation
Solution Approach 2:
The exhaust pipe serves dual functions: as the structural component of the exhaust system and as a heat sink for cooling the antinoise generator, eliminating the need for separate active cooling mechanisms
2Reliability
If the antinoise generator is isolated from the exhaust system to reduce thermal stress, then reliability is improved, but cooling effectiveness deteriorates
Solution Approach 1:
The patent introduces a thermal coupling element as an intermediary between the exhaust pipe and antinoise generator housing, which provides controlled thermal connection for heat dissipation while maintaining structural isolation to protect the sensitive electronics
Solution Approach 2:
The coupling element provides localized thermal management by creating a specific heat transfer path only where needed, allowing the antinoise generator to be thermally connected to the exhaust pipe for cooling while remaining isolated in other aspects
3Temperature
If the diaphragm drive is connected to the outside wall for cooling, then cooling effectiveness is improved, but sound transmission to the environment increases
Solution Approach 1:
The patent uses a flexible, vibration-damping material for the coupling element that allows thermal conduction while mechanically isolating the diaphragm drive vibrations from the outside wall, preventing noise transmission
Solution Approach 2:
The coupling element is made of composite or specially selected material that combines high thermal conductivity with high vibration damping properties, enabling simultaneous heat transfer and noise suppression
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 solution enables efficient cooling of the antinoise generator, prolonging its lifespan and maintaining the noise reduction effect by dissipating heat without compromising the muffler's compact design or increasing weight.
Implementation Method 1
The coupling element (11) is characterized in that it conducts heat and suppresses sound
Implementation Method 2
the noise reduction coupling, e.g., a mechanically elastic coupling, prevents transfer of the vibration of the diaphragm drive to the outside wall
Data Source
AI summary
The present invention relates to an active muffler for an exhaust gas system of an internal combustion engine, in particular in a motor vehicle, having at least one antinoise generator for applying antinoise to the exhaust gas, whereby the antinoise generator has a diaphragm drive with which it is coupled via at least one coupling element in a thermally conducting and noise-reducing manner to an outside wall of the muffler, which is in contact with the environment.