Muffler Base Wall Opening Edge for Exhaust Pipe Press Fit
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Solution Overview
Problem
Existing muffler designs for internal combustion engine exhaust systems fail to effectively prevent noise generation due to inadequate connections between base walls and exhaust pipes, leading to relative movements that cause impact or rattling noises.
Innovation Solution
A muffler design featuring a base wall with an opening edge region bent in the direction of the housing longitudinal axis, providing a press fit for the exhaust pipe, which ensures a stable and noise-reducing connection without the need for additional bonding measures, and optionally allowing for a material connection like welding for added security.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a base wall opening is made oversized to receive an exhaust pipe with play, then the exhaust pipe can be easily installed, but relative movements occur causing impact noises or rattling noises
Solution Approach 1:
The opening edge region is bent in the direction of the housing longitudinal axis to create a press fit connection. This changes the geometric parameter of the opening edge from a straight cylindrical shape to a tapered shape that generates radial compression force on the exhaust pipe, eliminating play and preventing relative movements that cause noise
Solution Approach 2:
The opening edge region is pre-bent during manufacturing to create a tapered geometry that will generate compressive force when the exhaust pipe is inserted. This preliminary deformation prepares the base wall to automatically create a noise-preventing press fit connection without requiring additional components or post-assembly adjustments
2Reliability
If welding or material connection is used to firm bond the exhaust pipe to the base wall, then a stable connection is achieved, but the device complexity and manufacturing difficulty increase
Solution Approach 1:
The opening edge region is designed to automatically generate a press fit connection through its own geometric configuration. When the exhaust pipe is inserted, the tapered shape causes the opening edge to compress radially inward, creating self-retaining force that firms the connection without requiring external welding equipment, additional bonding materials, or complex assembly procedures
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
The press fit connection effectively prevents noise generation by maintaining constant bearing contact and providing a stable bond, while allowing for easy installation and resistance to high temperatures and aggressive exhaust gases.
Implementation Method 1
an opening edge region which is bent at an essentially plane base wall region of the base wall essentially in the direction of the housing longitudinal axis
Implementation Method 2
receives an exhaust pipe with a press fit
Implementation Method 3
which prevents the generation of noise... because of constantly present bearing contact which is under pressure or pretension
Data Source
AI summary
A muffler for an exhaust system of an internal combustion engine includes a muffler housing with a peripheral wall which extends longitudinally in the direction of a housing longitudinal axis. At least one base wall is surrounded by the peripheral wall or/and retained on the peripheral wall and delimits a chamber in the muffler housing. At least one base wall opening is surrounded by an opening edge region which is bent at an essentially plane base wall region of the base wall essentially in the direction of the housing longitudinal axis. The at least one base wall opening receives an exhaust pipe with a press fit in at least one base wall.