Vehicle Seat Armrest Bracket Layout to Reduce Side Frame Bending
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Solution Overview
Problem
The existing armrest attaching structures for vehicle seats transmit rotational forces to the side frame element at a higher level, resulting in a large bending moment and load applied to the lower end portion of the seat back frame, which can lead to structural stress and potential damage.
Innovation Solution
An armrest attaching structure with a bracket that has a connecting portion positioned closer to the lower end of the side frame element, reducing the transmission of forces to the side frame element at a lower level, thereby minimizing the bending moment and load applied to the seat back frame.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the bracket is fixedly attached to the side frame element at a higher level, then the armrest can be stably supported, but a large bending moment is produced at the lower end portion of the side frame element
Solution Approach 1:
Instead of attaching the bracket at a higher level on the side frame element, the invention inverts the attachment position to a lower level, specifically at the lower end portion of the side frame element. This inversion resolves the contradiction by reducing the bending moment while maintaining support stability through proper force transmission path design.
Solution Approach 2:
The invention introduces a new dimensional consideration by extending the bracket structure downward beyond the traditional attachment point. The connecting portion reaches to the lower end portion of the side frame element, creating a longer force transmission path that reduces bending moment while maintaining armrest support functionality.
2Strength
If the bracket is welded at both upper and lower portions to the side frame element, then the connection is strong, but a large load is applied to the side frame element
Solution Approach 1:
The invention extracts the upper welding connection from the bracket design, retaining only the lower welding connection at the lower end portion of the side frame element. This extraction reduces the load on the side frame element while maintaining sufficient connection strength through the optimized lower attachment configuration.
Solution Approach 2:
The invention changes the attachment parameters by positioning the connecting portion at the lower end portion of the side frame element rather than at both upper and lower portions. This parameter change optimizes the force distribution, reducing the overall load on the side frame element while maintaining connection integrity.
3Strength
If the connecting portion is positioned closer to the lower end portion of the side frame element, then the bending moment is reduced, but the bracket structure becomes more complex
Solution Approach 1:
The invention merges the armrest attaching portion and the connecting portion into a single integrated bracket structure. This combining approach reduces device complexity by eliminating the need for separate components while achieving the beneficial effect of reduced bending moment through the optimized lower end portion attachment.
Data Source
AI summary
An armrest attaching structure for attaching an armrest to a vehicle seat having a seat back frame, the seat back frame having a side frame element that is connected to a base member at a lower end portion thereof, may include an armrest attachment member having an armrest attaching portion and a connecting portion. The armrest attaching portion is connected to the armrest. The connecting portion is connected to the side frame element of the seat back frame at a position closer to the lower end portion of the side frame element than the armrest attaching portion.