Seat Sensor Bracket Design for Accurate Position Detection
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Solution Overview
Problem
Conventional seat sliding mechanisms face restrictions in detection range due to limited attachment space, leading to inaccurate position sensing, especially when components like foot brackets are present, as the supporting structure for position sensors is not robust enough to withstand deflection.
Innovation Solution
The seat sliding mechanism includes a sensor bracket with a base fixed to the lower rail, a detected portion, and a supporting portion that is angled upward and forward or rearward, featuring a bead and flange for enhanced rigidity and reduced deflection, allowing for accurate detection even with restricted attachment positions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the position sensor is arranged orthogonally to the slide rails, then the sensor can detect the seat body position, but the detection range is restricted when another member is provided on the upper rail
Solution Approach 1:
The sensor bracket is designed to extend in the front-rear direction (longitudinal dimension) rather than only laterally (lateral dimension), creating a multi-dimensional arrangement that allows the detected portion to reach areas blocked by foot brackets while maintaining detection accuracy
2Measurement precision
If the bracket supporting the position sensor is made more rigid, then detection accuracy improves, but the complexity of the supporting structure increases
Solution Approach 1:
The sensor bracket is divided into functionally distinct segments: a base portion for mounting, a supporting portion for structural rigidity, and a detected portion for sensing. This segmentation allows each part to be optimized independently - the supporting portion provides necessary rigidity while the detected portion maintains simplicity for accurate sensing
Solution Approach 2:
Rigidity is concentrated in the supporting portion of the bracket where structural strength is needed, while the detected portion maintains a simpler geometry that facilitates accurate position detection. This localized differentiation of structural properties resolves the contradiction between rigidity and simplicity
3Measurement precision
If the detected portion is positioned closer to the position sensor, then detection accuracy improves, but the attachment position becomes more restricted due to foot brackets
Solution Approach 1:
The sensor bracket utilizes the front-rear longitudinal dimension to extend the detected portion forward or backward, allowing it to bypass foot brackets that occupy lateral space. This dimensional approach enables close positioning for accurate detection while maintaining attachment flexibility
Data Source
AI summary
A seat sliding mechanism includes a lower rail, an upper rail, a position sensor and a sensor bracket. The lower rail is provided on a side of a vehicle floor. The upper rail is provided at a lower part of a seat body and is slidably supported by the lower rail along front and rear directions. The position sensor is provided on the upper rail and detects a position along front and rear directions. The sensor bracket is provided on the lower rail and its proximity state to the position sensor is to be detected. The sensor bracket includes a base, a detected portion and a supporting portion. The base is fixed to a bottom of the lower rail. The detected portion is detected by the position sensor. The supporting portion supports the detected portion.