Exhaust Gas Flap Mounting Plate for Leak-Free Closure
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Solution Overview
Problem
Existing exhaust gas flaps for internal combustion engines face challenges in achieving a leak-free and acoustically tight closure, particularly when the flap diaphragm is in a closed position, due to interference between mounting areas and wing stops.
Innovation Solution
The exhaust gas flap features a pivot shaft with uncurved mounting surfaces and recesses, ensuring a complete closure by positioning flap wings symmetrically with respect to the pivot axis, and wing stops oriented along the flap tube longitudinal axis, preventing gas passage and enhancing acoustic tightness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If recesses are provided in the mounting areas to avoid interference with wing stops, then the flap diaphragm can rotate without interference, but the closure becomes incomplete and leak flows occur
Solution Approach 1:
The invention extracts the mounting area from the flap wing and relocates it to a separate mounting plate. This separation allows the wing stop to contact the flap wing edge directly without interference from the mounting area, eliminating the need for recesses while maintaining rotation functionality. The mounting plate is positioned such that its outer contour does not interfere with the wing stop contact point.
Solution Approach 2:
The mounting plate serves as an intermediary element between the pivot shaft and the flap wing. It provides the mounting connection while allowing the flap wing to extend beyond it, enabling the wing stop to contact the flap wing edge without interference from the mounting structure. This mediator resolves the conflict between rotation ease and closure tightness.
2Strength
If mounting areas extend to the pivot shaft, then the flap wing is securely mounted, but interference with wing stops prevents complete closure
Solution Approach 1:
The mounting area is extracted from the flap wing body and placed on a separate mounting plate. This allows the flap wing to have its full extent for proper contact with the wing stop, while the mounting plate provides secure attachment to the pivot shaft. The mounting plate's outer contour is designed to not interfere with the wing stop contact point.
Solution Approach 2:
The solution moves the mounting area to a different spatial dimension by using a separate mounting plate positioned radially outward from the pivot shaft. This dimensional separation allows the flap wing to extend axially to contact the wing stop without the mounting area interfering with the contact point.
3Ease of operation
If recesses are provided in mounting areas, then rotation is enabled, but the structural configuration becomes complex
Solution Approach 1:
Instead of modifying the mounting area with complex recesses, the invention extracts the mounting function to a separate mounting plate. This simplifies the overall structure by eliminating the need for recesses in the flap wing or mounting area, while still enabling rotation through the separate plate configuration.
Solution Approach 2:
The mounting function is segmented from the flap wing structure and placed on a separate mounting plate. This segmentation allows each component to have its optimal simple geometry - the flap wing for contact with the wing stop, and the mounting plate for attachment to the pivot shaft - without requiring complex integrated features.
Data Source
AI summary
An exhaust gas flap, especially for the exhaust gas stream of an internal combustion engine, includes a flap tube (22) and a flap diaphragm (24) carried in an interior of the flap tube on a pivot shaft (16) rotatable about a pivot axis. A flap wing (28, 30) is mounted on the pivot shaft (16) and a wing stop (32, 34) is associated with the flap wing (28, 30) on an inner circumferential area of the flap tube. The flap wing (28, 30) has a mounting area (56, 58) with uncurved mounting surfaces (60, 64). Opposing mounting surfaces (62, 66) or/and a mounting recess (52, 54) at the pivot shaft (16) provide an opposing mounting area that at least partially receives the flap wing mounting area (56, 58) of the flap wing (28, 30), the opposing mounting area being provided on the outer circumferential area of the pivot shaft (16).