Exhaust Gas Valve Gear Mechanism for High Opening Force
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Solution Overview
Problem
Valve devices used in exhaust gas systems of motor vehicles face issues with contaminants adhering to the valve seat, making reliable opening difficult without increasing the diaphragm area and thus the installation space.
Innovation Solution
A gear mechanism is used to connect the diaphragm to the valve closing member, translating the diaphragm's movement into a slower movement of the valve closing member, achieving a force transmission ratio greater than 1:1, allowing for reliable opening even with contaminants, while maintaining a small installation space.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If the diaphragm area is increased to generate greater opening force, then the valve can be reliably opened even with contaminants on the valve seat, but the installation space of the valve device is adversely enlarged
Solution Approach 1:
A gear mechanism is introduced as an intermediary between the diaphragm and the valve closing member. This mechanism translates the diaphragm's movement into a slower movement of the valve closing member, achieving a force transmission ratio greater than 1:1. The gear mechanism acts as a mediator that amplifies the opening force generated by the diaphragm, allowing a smaller diaphragm area to produce sufficient force to overcome contaminants on the valve seat.
Solution Approach 2:
The patent changes the transmission ratio parameter of the gear mechanism to achieve force amplification. By designing the gear mechanism with a transmission ratio that translates diaphragm movement into slower valve closing member movement, the system achieves a force transmission ratio greater than 1:1, thereby multiplying the opening force without increasing the diaphragm area.
2Force
If a gear mechanism is used to amplify force, then the opening force is increased, but the device complexity increases
Solution Approach 1:
The gear mechanism serves as a compact intermediary component that provides force amplification. While it does increase device complexity, the patent integrates this mechanism efficiently within the valve housing, using a diaphragm clamping cover that also serves as part of the gear mechanism structure, thereby minimizing the overall complexity increase.
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 ensures reliable valve opening with a smaller diaphragm surface area, providing a large force for opening the valve device, even when the valve closing member sticks to the seat, and allows for efficient fluidic connection between the inlet and outlet, while minimizing the installation space.
Implementation Method 1
a pressure difference between the first control chamber and the second control chamber, which pressure difference acts on the diaphragm surface
Implementation Method 2
a gear mechanism that comprises a translation of a movement of the diaphragm into a movement of the valve closing member of less than 1:1, as a result of which the speed of the valve closing member is lower than the speed of the diaphragm, a corresponding force transmission of more than 1:1 is achieved
Data Source
AI summary
Valve device, in particular for an exhaust gas section of an internal combustion engine, includes a valve housing with an inlet and outlet, a valve seat arranged between the inlet and outlet and having a valve opening, closeable by a valve closing member pressed against the valve seat by a predetermined force, and a diaphragm acting on the valve closing member. A first control chamber is separated from a second control chamber by the diaphragm so that the valve is switched by a pressure difference between the first control chamber and second control chamber. For reliable opening even under adverse operating conditions, the diaphragm is connected to the valve closing member, at least over a partial range of a possible stroke of the valve closing member, via a gear mechanism to translate movement of the diaphragm into movement of the valve closing member at a lower speed.