Exhaust Perforated Cover Movable Support for Thermal Expansion
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Solution Overview
Problem
Existing exhaust system components face challenges with thermal expansions, leading to high loads on perforated covers due to differing thermal expansion coefficients of materials used, such as ferritic and austenitic steel alloys, which can cause premature wear and noise.
Innovation Solution
A support system is introduced that allows the perforated cover to shift parallel to the component's wall, with a clearance to accommodate thermal expansions, using a push-fit mechanism and a frame-like support to prevent uncontrolled movement and vibration, while being cost-effectively manufactured with sheet metal components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the perforated cover is rigidly welded to the wall, then reliable fastening is achieved, but high thermal expansion loads cause premature wear and noise
Solution Approach 1:
The support structure incorporates a movable connection that allows the perforated cover to shift dynamically in response to thermal expansion. The clearance between the cover and support enables controlled movement, transforming the rigid static connection into a dynamic adaptive connection that accommodates dimensional changes without generating harmful loads.
Solution Approach 2:
The invention changes the connection parameter from rigid fixed to movable with clearance. By introducing a defined gap between the perforated cover and the support structure, the system allows thermal expansion-induced displacement while maintaining reliable fastening through the support's restraining function.
2Object-affected harmful factors
If the perforated cover is allowed to move freely, then thermal expansion is accommodated, but uncontrolled movement and vibration occur
Solution Approach 1:
The support structure creates a controlled dynamic system where the perforated cover can move within defined limits (clearance) but is restrained from uncontrolled movement. The movable connection allows thermal expansion while the support's geometric constraints prevent excessive displacement and vibration.
Solution Approach 2:
The thin-walled support structure acts as a flexible constraint that allows controlled movement through the clearance while maintaining structural integrity. The support's geometry provides gentle restraint that accommodates expansion without creating rigid constraints that would cause stress concentration.
3Object-generated harmful factors
If a complex fastening system is used to prevent vibration, then noise is reduced, but manufacturing complexity and cost increase
Solution Approach 1:
The fastening function is segmented into two independent elements: the support structure that provides fastening and positioning, and the clearance that provides vibration damping and thermal expansion accommodation. This segmentation eliminates the need for complex vibration-damping mechanisms while maintaining both fastening reliability and noise reduction.
Solution Approach 2:
The clearance acts as an intermediary element between the perforated cover and the support structure. This gap serves multiple functions simultaneously: allowing thermal expansion, reducing vibration transmission, and simplifying the overall fastening system by eliminating the need for additional damping components.
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 ensures reliable fastening and minimizes mechanical stress and noise by allowing thermal expansion while preventing premature wear and vibration, thus enhancing the durability and noise reduction of the exhaust system components.
Implementation Method 1
high loads may act onto the perforated cover when thermal expansions occur. The higher the difference of the thermal expansion coefficients is, the more critical is the effect of the loads
Data Source
AI summary
A component of an exhaust system for a combustion engine has a wall in which at least one opening is provided, and a perforated cover which is associated with the opening. A support is provided by which the perforated cover is mounted to the wall of the component. Further, a clearance is provided between the support and the cover such that the cover can shift parallel to the wall of the component.