Internal Combustion Engine Mixing Valve Coupling Rod Design
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Solution Overview
Problem
Existing mixing valves for internal combustion engines require complex structures and many components, leading to high structural outlay and instability.
Innovation Solution
A coupling device with a coupling rod for direct transmission of control lever movements, where the control lever of the exhaust flap and coupling rod are at an obtuse angle and the intake flap's control lever and coupling rod are at an acute angle, eliminating the need for idle travel, damping, or spring elements, allowing for greater exhaust duct opening and delayed intake duct closure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a driver with idle travel and spring element is used to couple the control levers, then the intake flap can be preloaded and controlled, but the structural outlay and complexity increase significantly
Solution Approach 1:
The patent removes the idle travel mechanism and spring element from the coupling device, extracting the unnecessary components that caused complexity while retaining the essential coupling function between control levers through a simplified rod connection
Solution Approach 2:
The coupling rod directly transmits movement between control levers without requiring external spring elements or idle travel mechanisms, allowing the system to self-regulate the flap movements through direct mechanical coupling
2Productivity
If the control levers are arranged at specific angles with the coupling rod, then the exhaust duct opens to a greater degree than the intake duct closes, achieving delayed closure, but the geometric configuration becomes complex
Solution Approach 1:
The patent optimizes the angular parameters between control levers and coupling rod, specifically setting the exhaust flap control lever at an obtuse angle and the intake flap control lever at an acute angle, to achieve the desired differential movement ratio without complex mechanisms
3Device complexity
If direct transmission of movements between control levers is implemented, then the number of components is reduced and stability increases, but the ability to provide idle travel and preloading is lost
Solution Approach 1:
The patent extracts and removes the idle travel mechanism from the system, recognizing that direct transmission achieves the core function without requiring the complexity of idle travel mechanisms, while the angular configuration provides the necessary movement differential
Data Source
AI summary
A mixing valve of an exhaust-gas recirculation device of an internal combustion engine of a motor vehicle includes an intake flap and an exhaust-gas flap coupled rigidly to one another via a coupling rod. During driving of the exhaust-gas flap, the intake flap is first pivoted in the opposite direction via the coupling rod. The exhaust-gas flap and intake flap are pivoted in the same direction only above a provided pivoting angle.