Exhaust Shut-Off Flap Using Pipe Stop Surfaces for Engine Braking
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Solution Overview
Problem
Existing exhaust gas guidance systems for internal combustion engines require complex integration of stop and sealing surfaces for butterfly valves, which complicates the design and functionality.
Innovation Solution
The system incorporates an exhaust gas shut-off valve device with pivotable shut-off valves that rest against existing stop surfaces on the exhaust pipe, eliminating the need for separate stop and sealing surfaces within the valve device.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If stop and sealing surfaces are integrated into the engine braking device, then the shut-off valve can be properly positioned and sealed, but the device complexity increases
Solution Approach 1:
The patent merges the stop surface and sealing surface functions into the exhaust pipe structure itself, rather than integrating them separately into the engine braking device. The exhaust pipe's flange surface serves as the stop surface, and the exhaust pipe wall provides the sealing surface, thereby reducing overall device complexity while maintaining reliable sealing and positioning of the shut-off valve.
2Manufacturing precision
If separate stop and sealing surfaces are provided within the valve device, then precise valve positioning is achieved, but manufacturing complexity increases
Solution Approach 1:
The exhaust pipe is designed to serve multiple functions: it conducts exhaust gas, provides the stop surface for valve positioning via its flange surface, and provides the sealing surface through its wall structure. This multi-functional design achieves precise valve positioning without requiring separate dedicated components, thereby simplifying manufacturing.
3Device complexity
If the shut-off valve rests against the exhaust pipe surface, then the design is simplified, but the exhaust pipe must bear additional functional requirements
Solution Approach 1:
The patent combines multiple functions into the exhaust pipe structure: exhaust gas conduction, provision of stop surface for valve positioning, and provision of sealing surface. The exhaust pipe's flange surface and wall are designed to simultaneously serve these purposes, simplifying overall device complexity while the exhaust pipe assumes multiple functional roles.
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 design simplifies the integration of shut-off valves, enhances sealing efficiency, and achieves high exhaust backpressure for improved engine braking performance without additional complexity.
Implementation Method 1
block or at least reduce the exhaust gas flow through the exhaust system and thereby increase exhaust gas back pressure
Implementation Method 2
In a closed position of the at least one shut-off valve, the at least one shut-off valve rests against at least one stop surface of the exhaust pipe
Data Source
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AI summary
The invention relates to a device (10) for conducting exhaust for an internal combustion engine, having an exhaust pipe (12) and an exhaust blocking flap device (14) with at least one movable blocking flap (22). The exhaust blocking flap device (14) is arranged upstream or downstream of the exhaust pipe (12), and the at least one blocking flap (22) lies on at least one stop surface (34) of the exhaust pipe (12) in a closed position of the at least one blocking flap (22). The device (10) can offer the advantage that no stop and/or seal surface for the blocking flap (12) must be integrated within the exhaust blocking flap device (14) in a costly manner. Instead, simply one surface of an exhaust pipe (14) arranged upstream or downstream can be used as the stop surface for the blocking flap (22), said surface preferably already being provided.