Link Mechanism Mounting Structure for Position Detection Accuracy
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Solution Overview
Problem
In link mechanisms, especially in waste gate valve control devices, the eccentricity of the rod during rotation leads to reduced detection accuracy of contactless stroke sensors due to varying intervals between the sensor and the rod, causing instability and noise in the system.
Innovation Solution
A mounting structure is designed where the lever and rod are connected such that the intermediate angle is equal to or greater than the larger of the first and second angles, reducing the deflection angle of the rod about its fulcrum, and a thrust bearing is used to support the rod, allowing oblique movement without noise or bearing wear, while a partition wall isolates the movable magnet and detecting means to minimize environmental influences.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the rod is connected orthogonally to the lever to form a neutral point, then the link mechanism achieves simple structural configuration, but the rod becomes excessively eccentric during reciprocation causing detection accuracy deterioration
Solution Approach 1:
The patent changes the symmetric orthogonal connection (90 degrees) to an asymmetric connection where the rod is inclined at a specific angle relative to the lever. This asymmetric configuration reduces the eccentricity of the rod during reciprocation, thereby improving detection accuracy while maintaining structural simplicity.
Solution Approach 2:
The patent modifies the geometric parameters of the link mechanism, specifically the angle between the rod and lever, and the position of the connecting shaft relative to the oscillation shaft. By optimizing these parameters, the rod's eccentricity is reduced, which improves the consistency of the interval between the rod and stroke sensor, thereby enhancing detection accuracy.
2Volume of moving object
If the stroke sensor is positioned close to the rod for compact design, then the device size is reduced, but the detection accuracy deteriorates due to rod eccentricity
Solution Approach 1:
By采用 asymmetric connection configuration, the rod's reciprocation path becomes more linear and less eccentric. This allows the stroke sensor to be positioned closer to the rod without sacrificing detection accuracy, as the reduced eccentricity maintains a more consistent interval between the sensor and rod throughout the reciprocation cycle.
3Area of moving object
If the connecting shaft is positioned far from the oscillation shaft, then the lever oscillating angle range is increased, but the rod eccentricity is increased causing detection instability
Solution Approach 1:
The patent optimizes the distance between the connecting shaft and oscillation shaft, and the angle of the rod relative to the lever, to achieve a balance between oscillating angle range and rod eccentricity. By carefully selecting these geometric parameters, the system achieves sufficient oscillation range while minimizing rod eccentricity to maintain detection stability.
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 stabilizes the driven body, reduces oscillation, and enhances detection accuracy by maintaining consistent intervals between the movable magnet and detecting means, improving position-detection precision and extending the life of the thrust bearing.
Implementation Method 1
a thrust bearing is used to support the rod, allowing oblique movement without noise or bearing wear
Implementation Method 2
a magnetic moving body 907 that is installed integrally with the rod 904 and includes a magnet generating a magnetic field having constant magnetic flux density
Data Source
AI summary
A mounting structure includes a lever (L1) that oscillates and a rod (R2) that can reciprocate, in which an arc endpoint of an arc close to a fulcrum (PP) is defined as a first arc endpoint (GA1), an arc endpoint of the arc distant from the fulcrum (PP) is defined as a second arc endpoint (GA2), a line perpendicular to a lever line segment (LJM) of the lever (L1) from the fulcrum (PP) is defined as a perpendicular line segment (VL), an angle between an intermediate line (PG3), which connects the fulcrum (PP) with an arc intermediate point (GA3), and the perpendicular line segment (VL) is defined as an intermediate angle (AN3), an angle between a first line segment (PG1), which connects the fulcrum (PP) with the first arc endpoint (GA1), and the perpendicular line segment (VL) is defined as a first angle (AN1), an angle between a second line segment (PG2), which connects the fulcrum (PP) with the second arc endpoint (GA2), and the perpendicular line segment (VL) is defined as a second angle (AN2), and the intermediate angle (AN3) is equal to or greater than a larger one of the first angle (AN1) and the second angle (AN2).