Exhaust-Gas Flap Coupling with Preload and Thermal Isolation
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Solution Overview
Problem
Existing coupling arrangements for exhaust-gas flaps in internal combustion engines face challenges in maintaining defined positioning and minimizing heat transfer between coupling elements while ensuring rotational coupling and axial stability.
Innovation Solution
A coupling arrangement with a first and second coupling element, each having rotational coupling projections and cutouts, and a preload element that generates peripheral and axial forces to ensure transverse positioning and reduce heat transfer through radial support regions and T-shaped cutouts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If radial support regions are added to support coupling elements transverse to the pivot axis, then positioning stability is improved, but heat transfer between coupling elements increases
Solution Approach 1:
The coupling elements are segmented into distinct functional regions: peripheral support regions for rotational coupling, radial support regions for transverse positioning, and T-shaped cutouts for heat isolation. This segmentation allows each region to perform its specific function independently, enabling stable positioning while minimizing heat transfer through strategic thermal breaks.
Solution Approach 2:
Different regions of the coupling elements are given different thermal and mechanical properties. The peripheral support regions provide mechanical contact for rotation, while the T-shaped cutouts create localized thermal breaks. The radial support regions provide transverse positioning without continuous thermal pathways, allowing localized optimization of both mechanical stability and thermal isolation.
2Object-generated harmful factors
If coupling elements are supported in peripheral direction only, then heat transfer is minimized, but transverse positioning is not sufficiently defined
Solution Approach 1:
The solution transitions from one-dimensional peripheral support to two-dimensional support by adding radial support regions that extend in the transverse direction. This dimensional expansion provides defined positioning in both peripheral and radial directions, while T-shaped cutouts strategically interrupt thermal pathways to maintain heat isolation despite the increased contact area.
3Manufacturing precision
If additional contact points are introduced for transverse support, then positioning precision is improved, but thermal conduction increases
Solution Approach 1:
The T-shaped cutouts act as thermal intermediaries or breakers between the radial support regions. These cutouts interrupt continuous thermal pathways while allowing mechanical contact for positioning. The design creates a mechanical bridge for precision positioning while maintaining a thermal break, enabling high positioning precision without proportional increase in thermal conduction.
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 provides stable and defined positioning of coupling elements transverse to the pivot axis while minimizing heat transfer, ensuring efficient rotational coupling and axial stability, despite additional contact points.
Implementation Method 1
a preload element for generating a force which acts on the first coupling element and the second coupling element substantially in a peripheral direction with respect to one another
Data Source
AI summary
A coupling arrangement is disclosed for rotationally coupling a drive element of a pivoting drive of an exhaust-gas flap for the exhaust-gas flow to a pivot shaft that is rotatable about a pivot axis. A first coupling element has a coupling region coupled to the pivot shaft for conjoint rotation about the pivot axis and a second coupling element has a coupling region coupled to the drive element for conjoint rotation about the pivot axis. A preload element acts on the first coupling element and the second coupling element substantially in a peripheral direction with respect to one another. One of the coupling elements has two rotational coupling projections which extend radially outward with respect to the coupling region of the coupling element. The other coupling element includes, so as to be assigned to each rotational coupling projection, a rotational coupling cutout which receives the corresponding rotational coupling projection.