Valve Link Toggle Mechanism for Exhaust Noise and Pressure Loss
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Solution Overview
Problem
Existing valve devices for exhaust flow passages face challenges in balancing noise reduction at low engine revolutions with pressure loss reduction at high engine revolutions, and require multiple components to achieve different toggle mechanism characteristics.
Innovation Solution
A valve device with a link-type toggle mechanism using a first and second link-forming member, where the link lengths and widths are designed to allow the same components to be used in different arrangements, enabling the fabrication of multiple toggle mechanisms with varying characteristics from fewer components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the coil spring is designed to provide a larger biasing force to reduce exhaust noise in the low-revolution state, then the effect of reducing exhaust noise is improved, but the effect of reducing pressure loss in the high-revolution state is impaired
Solution Approach 1:
The patent introduces a link-type toggle mechanism that changes the mechanical parameters of the valve system. By utilizing the toggle mechanism's geometric configuration (link lengths and angles), the system achieves different mechanical advantage ratios at different valve positions, effectively changing the force transmission parameters to resolve the contradiction between noise reduction and pressure loss reduction
2Force
If the link angle formed by the first link member and the second link member is made larger to require stronger external force for opening the valve body, then the biasing force of the biasing member can be reduced, but the device complexity increases due to multiple components
Solution Approach 1:
The patent merges the first link member and the second link member into a single integrated link structure. This unified link comprises two link-forming members coupled together, forming the toggle mechanism while reducing the total number of separate components. The integration maintains the mechanical advantage of the toggle mechanism while simplifying the overall device structure
3Adaptability or versatility
If multiple kinds of toggle mechanisms having different characteristics are to be fabricated, then the adaptability is improved, but the kinds of components are inevitably increased
Solution Approach 1:
The patent designs the link with universal characteristics that allow it to function in multiple configurations. The link structure can be arranged in different orientations and configurations while maintaining its toggle mechanism functionality, enabling a single component design to serve multiple purposes and achieve different characteristics without requiring multiple specialized components
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 configuration allows for the creation of valve devices with different characteristics from common components, improving noise reduction at low engine revolutions and pressure loss reduction at high engine revolutions, while simplifying the component structure and facilitating fabrication.
Implementation Method 1
the valve body is biased in a closing direction by a coil spring
Implementation Method 2
a link-type toggle mechanism has been proposed... the larger (i.e., the closer to 180 degrees) a link angle formed by the first link member and the second link member is, the stronger external force is required to rotationally move the valve body in an opening direction
Data Source
AI summary
A link couples a support body and a valve body in a first arrangement where a first link-forming member is rotationally movably supported by the support body and in which a second link-forming member is rotationally movably supported by the valve body. The link includes: a link length that is a length of the first link-forming member, as measured between a rotation axis with respect to the support body and a rotation axis with respect to the second link-forming member; and a link length that is a length of the second link-forming member, as measured between a rotation axis with respect to the valve body and a rotation axis with respect to the first link-forming member. The link lengths differ from each other. The link is also configured to enable coupling between the support body and the valve body in a second arrangement inverted with respect to the first arrangement.