Vehicle Switch Spherical Contact for Magnet Alignment
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Solution Overview
Problem
Conventional vehicle switches experience positional discrepancies between the magnet and detector due to the oblique movement of the operating shaft, leading to errors in detecting magnetic flux density when the brake pedal is operated, affecting the reliable on/off switching of the stop lamp.
Innovation Solution
The vehicle switch design includes a movable body with a spherical press contact portion that maintains vertical movement, ensuring the magnet remains aligned with the detector, preventing positional discrepancies and ensuring accurate detection of magnetic flux density changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the operating shaft is allowed to move obliquely in the gap between its outer peripheral part and the internal peripheral part of cylindrical part, then the ease of operation is improved, but the measurement precision of magnetic flux density deteriorates due to positional discrepancy between magnet and detector
Solution Approach 1:
A spherical press contact portion is introduced as an intermediary element between the operating shaft and the movable body. This sphere maintains point or line contact that guides the movable body to move vertically along the central axis, preventing oblique movement while preserving operational ease. The spherical interface acts as a mediator that converts potentially oblique shaft movement into precise vertical motion of the magnet-bearing movable body.
Solution Approach 2:
The press contact portion is formed as a spherical surface, which allows for point or line contact with the operating shaft. This curved geometry enables the contact to self-align and guide vertical movement of the movable body, preventing lateral displacement. The spherical shape accommodates minor misalignments while maintaining the vertical motion path necessary for accurate magnet-detector alignment.
2Adaptability or versatility
If the operating shaft is pressed obliquely, then the adaptability to different operating conditions is improved, but the reliability of switch operation deteriorates due to errors in detecting magnetic flux density
Solution Approach 1:
The spherical press contact portion serves as a mediator that decouples the oblique operating shaft movement from the movable body motion. It allows the shaft to be pressed in various directions (improving adaptability) while ensuring the movable body moves only vertically (maintaining reliability). The sphere converts multidirectional input forces into unidirectional vertical motion, preserving detection accuracy.
Solution Approach 2:
The spherical geometry of the press contact portion provides mechanical guidance that maintains vertical alignment of the movable body regardless of the direction of force applied to the operating shaft. This curved contact surface allows adaptability to different pressing directions while ensuring the magnet remains properly aligned with the detector, thereby maintaining reliable operation.
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 ensures secure and error-free operation of the stop lamp switching mechanism by maintaining vertical movement of the movable body, even when the operating shaft is pushed obliquely, thereby preventing positional discrepancies between the magnet and detector.
Implementation Method 1
Spring 9 in a coil shape is disposed slightly compressed between a bottom face of operating body 2 and an inner bottom of case 1, resiliently pushing operating body 2 upward.
Implementation Method 2
Magnet 3 is attached to a lower left side of operating body 2. Detector 6 composed of a hall element is formed facing magnet 3.
Implementation Method 3
Detector 6 composed of a hall element is formed facing magnet 3.
Data Source
AI summary
A vehicle switch has a case, a movable body, a spring, a magnet, a detector, and an operating shaft. The movable body is reciprocably accommodated in the case. The spring pushes the movable body in a direction away from an internal bottom of the case. The magnet is attached to the movable body. The detector detects a magnetic flux density generated from the magnet. A lower end of the operating shaft is in contact with the movable body. The movable body has a press contact portion with which the operating shaft is in contact at a point or along a line.