Exhaust Flap Coupling Assembly Thermal Decoupling
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Solution Overview
Problem
Existing exhaust gas flap coupling arrangements fail to provide adequate thermal decoupling while maintaining torsional strength and precise positioning of the pivot shaft, leading to inefficiencies in heat management and positional stability.
Innovation Solution
A coupling arrangement featuring two resilient coupling parts made of sheet metal, with form-fitting engagement regions and counter-locking formations, that prestress the pivot shaft away from the drive element, creating a torsionally rigid and thermally efficient connection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a coupling arrangement connects the drive element to the pivot shaft, then torsional strength and positioning precision are improved, but thermal decoupling deteriorates
Solution Approach 1:
The coupling arrangement is divided into two separate coupling parts (first coupling part connected to pivot shaft, second coupling part connected to drive element) that engage with each other through form-fitting engagement. This segmentation allows the coupling to maintain torsional rigidity through the engagement mechanism while creating thermal separation between the hot drive element and the pivot shaft, resolving the contradiction between strength and thermal decoupling.
2Manufacturing precision
If the coupling arrangement prestresses the pivot shaft away from the drive element, then positioning precision is improved, but device complexity increases
Solution Approach 1:
The coupling arrangement combines multiple functions into a single integrated structure: the two coupling parts with form-fitting engagement provide both the prestressing force (through resilient material deformation) and the positioning precision (through form-fitting geometric engagement). This merging of functions achieves precise positioning without requiring separate complex positioning mechanisms, resolving the contradiction between precision and complexity.
3Strength
If sheet metal material is used for coupling parts, then thermal decoupling and torsional strength are improved, but manufacturing complexity increases
Solution Approach 1:
The coupling parts are made from sheet metal material with specific thickness parameters and elastic properties that enable the resilient deformation needed for prestressing. By carefully selecting and optimizing the material parameters (thickness, elastic modulus), the design achieves the required torsional strength and thermal decoupling while maintaining manufacturability through standard sheet metal forming processes, resolving the contradiction between performance and ease of manufacture.
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 solution enhances torsional strength, ensures precise positioning of the pivot shaft, and facilitates efficient heat dissipation, thereby improving the operational efficiency and stability of the exhaust gas flap.
Implementation Method 1
a first coupling part made of resilient material with a first coupling area designed for coupling to the pivot shaft and a second coupling part made of resilient material with a second coupling area designed for coupling to the drive member, wherein in the coupling state the first coupling part and the second coupling part are in rotational coupling form-fitting engagement stand with each other and are resiliently supported on each other in the direction of the pivot axis
Data Source
Figure 1
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AI summary
A coupling arrangement (32) for rotary coupling of a pivot shaft (18) of a flap gate (16) of an exhaust flap (10) to be rotated about a pivot axis (A) with a drive element (34) comprises a first coupling part (36) with a first coupling area designed for coupling to the pivot shaft (18) and a second coupling part (38) with a second coupling area designed for coupling to the drive element (34), wherein in the coupling state the first coupling part (36) and the second coupling part (38) are in rotary coupling positive engagement with each other and are supported against each other in the direction of the pivot axis (A).