Vehicle Seat Slide Position Detection Bracket Design
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Solution Overview
Problem
Existing slide position detecting devices for vehicle seats face issues with maintaining a stable distance between the magnetic detector and detected body due to manufacturing variations, especially when the bracket is attached to the upper rail, leading to deviations from the allowable range.
Innovation Solution
A slide position detecting device with a magnetic detector and detected portion positioned on the upper rail, utilizing an attachment bracket with a bottom plate and side plate combination, where the angle between these components is set to match the angle of the seat-side member, and the rigidity is adjusted to maintain stability, allowing for flexible positioning and absorption of manufacturing variations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the bracket is configured with the attachment point apart from the detected body to accommodate manufacturing variations, then the adaptability improves, but the distance stability deteriorates
Solution Approach 1:
The bracket is designed with flexible connection portions that can dynamically adjust their angle to match the actual angle between the upper rail and seat-side member during assembly. This dynamic adaptability allows the bracket to accommodate manufacturing variations in the angle (within a range including 90 degrees) while maintaining stable positioning of the magnetic detector relative to the detected body, thus resolving the contradiction between adaptability and distance stability.
2Manufacturing precision
If the angle between bracket components is made fixed to maintain distance stability, then the distance stability improves, but the ease of manufacture deteriorates
Solution Approach 1:
The bracket's connection portions are designed with variable angle capability rather than a fixed angle. The angle between the bottom plate portion and side plate portion can change within a specific range to match the actual angle between the upper rail and seat-side member during assembly. This parameter flexibility simplifies the assembly process and accommodates manufacturing variations without requiring high-precision fixed-angle manufacturing, thus resolving the contradiction between distance stability and ease of manufacture.
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 ensures a stable position for the magnetic detector and detected portion, preventing significant changes in the distance between them, even with manufacturing variations, thereby maintaining detection accuracy and flexibility in positioning.
Implementation Method 1
a magnetic detector attached to a movable rail; and a detected portion attached to a fixed rail at a position facing the magnetic detector. When the movable rail slides on the fixed rail, a slide position is detected by detecting whether or not the detected portion is placed at the position facing the magnetic detector.
Data Source
AI summary
In a slide position detecting device for a vehicle seat, an angle between a bottom plate portion and a side plate portion of an attachment bracket is set to a maximum angle in a range of an angle between a bottom wall portion and a side wall portion of a seat-side member; rigidity maintaining the angle between the bottom plate portion and the side plate portion is set to be lower than rigidity maintaining the angle between the bottom wall portion and the side wall portion; and when the side plate portion is fixed to the side wall portion, the bottom plate portion contacts the bottom wall portion or a top face portion of an upper rail, and is fixed in a state where the angle between the bottom plate portion and the side plate portion coincides with the angle between the bottom wall portion and the side wall portion.