Shift Device Magnetic Shielding for Compact Design
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Solution Overview
Problem
Existing shift devices face challenges in reducing size while preventing magnetic fields outside the rotation shaft from reaching the detection section.
Innovation Solution
The shift device incorporates a generation section to create a magnetic field, a detection section to detect the shift position, and a suppressing section to prevent external magnetic fields from reaching the detection section, with the suppressing section covering the apex and side faces of the detection section and being disposed around the generation section.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a suppressing section is added to prevent external magnetic fields from reaching the detection section, then detection precision is improved, but device size increases
Solution Approach 1:
The suppressing section is integrated into the rotation shaft structure, with the detection section nested within the suppressing section. The generation section is positioned on the rotation shaft such that the suppressing section surrounds it. This nested configuration allows the suppressing function to be incorporated without adding external components, thereby preventing external magnetic fields from reaching the detection section while avoiding an increase in overall device size.
2Volume of moving object
If the detection section is positioned close to the generation section for compact design, then device size is reduced, but detection precision deteriorates due to external magnetic field interference
Solution Approach 1:
The suppressing section acts as an intermediary between the external environment and the detection section. It is positioned between external magnetic field sources and the detection section, effectively blocking external magnetic field interference while allowing the detection section to remain close to the generation section for compact design. This mediator structure enables both compact size and high detection precision to be achieved simultaneously.
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 a reduction in device size while effectively suppressing external magnetic fields, enhancing detection precision and simplifying the device configuration.
Implementation Method 1
a generation section that is disposed at the rotation shaft and that generates a magnetic field
Implementation Method 2
a detection section that is disposed at the rotation shaft, that has a changeable placement relative to the generation section when the rotation shaft is rotated, and that is configured to detect the shift position of the shift body by detecting the magnetic field generated by the generation section
Implementation Method 3
a suppressing section that is disposed at the rotation shaft, and that suppresses a magnetic field outside the rotation shaft from reaching the detection section
Data Source
AI summary
In a shift device, the placement of magnets relative to sensors can be changed by rotating a ball shaft of a lever. The sensors detect magnetic fields generated by the magnets in order to detect a shift position of the lever. Shields suppress a magnetic field outside the ball shaft from reaching the sensors. The magnets, the sensors, and the shields are disposed on the ball shaft. This enables a reduction in the size of the shift device.