Sheet Metal Coupling Device for Exhaust Gas Flap Torsional Rigidity
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing coupling devices for rotary coupling of a pivot shaft of a flap diaphragm in exhaust gas flaps lack sufficient torsional rigidity and effective thermal uncoupling from the drive element.
Innovation Solution
A coupling device comprising two sheet metal coupling parts with positive-locking meshing areas, supported in the direction of the pivot axis, providing a torsionally rigid connection and axial prestress to maintain the pivot shaft's position, while allowing efficient heat dissipation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a C-shaped coupling element made of wire material is used, then the coupling device can be manufactured with simple structure, but the torsional rigidity is insufficient
Solution Approach 1:
The coupling element is divided into two separate coupling parts (first coupling part and second coupling part) that mesh with each other. This segmentation allows each part to be optimized for specific functions: one part couples with the pivot shaft while the other couples with the drive element, achieving both manufacturing simplicity and enhanced torsional rigidity through the meshing configuration
Solution Approach 2:
The coupling parts are made from sheet metal material (such as steel sheet or titanium sheet) instead of wire material. This material transition provides higher torsional rigidity and strength while maintaining ease of manufacture through sheet metal forming processes, directly resolving the contradiction between manufacturing simplicity and torsional rigidity
2Strength
If the coupling parts are made with large cross-sectional area, then the torsional rigidity is improved, but the heat dissipation capability deteriorates
Solution Approach 1:
The coupling parts exhibit different cross-sectional characteristics in different regions: the body area has sufficient thickness for torsional rigidity, while the positive-locking meshing areas have reduced cross-sectional area to minimize heat conduction paths. This local variation in geometry allows the structure to simultaneously achieve high torsional rigidity where needed and effective thermal uncoupling where heat dissipation is critical
3Temperature
If the coupling parts are made with small cross-sectional area, then the heat dissipation is improved, but the torsional rigidity deteriorates
Solution Approach 1:
The coupling parts utilize a three-dimensional configuration where the body area provides structural strength through adequate thickness, while the meshing areas extend in different spatial orientations. The positive-locking meshing areas are bent at angles relative to the body area, creating a geometry that provides torsional rigidity through spatial distribution of material rather than relying solely on cross-sectional area, thereby enabling heat dissipation without sacrificing strength
4Strength
If the coupling parts are made from sheet metal material, then the torsional rigidity and heat dissipation are improved, but the manufacturing complexity increases
Solution Approach 1:
The coupling parts are designed with specific geometric parameters that facilitate sheet metal manufacturing: the body area provides a flat or strip-shaped cross-section that is easy to form from sheet metal, and the positive-locking meshing areas are created by bending the sheet material at defined angles. These parameter choices maintain manufacturing simplicity while achieving the desired torsional rigidity and thermal uncoupling properties
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 rigidity and maintains precise positioning of the flap diaphragm during adjustments, while ensuring effective heat dissipation and stable coupling between the pivot shaft and drive element.
Implementation Method 1
it has a comparatively large surface, so that heat absorbed from the area of the exhaust gas flap can efficiently dissipate heat to the surrounding area
Data Source
AI summary
A coupling device (32) provides a rotary coupling of a pivot shaft (18) of a flap diaphragm (16) of an exhaust gas flap (10) with a drive element (34). The pivot shaft is to be rotated about a pivot axis (A). The coupling device (32) includes a first coupling part (36) with a first coupling area configured for coupling with the pivot shaft (18) and a second coupling part (38) with a second coupling area configured for coupling with the drive element (34). The first coupling part (36) and the second coupling part (38) are in a rotary coupling positive-locking meshing state with one another in the coupled state and are supported on one another in the direction of the pivot axis (A).