Vehicle Headrest Mounting Structure With Dynamic Gap Occupying Part
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Solution Overview
Problem
Conventional headrest mounting structures for vehicle seats require increased insertion force to prevent rattling, which reduces workability and may lead to instability and poor load distribution during collisions.
Innovation Solution
Incorporating gap occupying parts on the support that move between advanced and retracted positions to reduce insertion force and prevent rattling, while providing stability and accurate mounting by deforming to contact the holder's inner surface, thereby maintaining contact points even under load.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If protrusions are formed on the support to prevent rattle, then rattle prevention is improved, but insertion force increases
Solution Approach 1:
The support incorporates a movable gap occupying part that dynamically adjusts its position. During insertion, it moves to a retracted position to reduce interference and insertion force. After insertion, it moves to an advanced position to occupy the gap and prevent rattle, thus dynamically resolving the contradiction between easy insertion and rattle prevention.
Solution Approach 2:
The gap occupying part changes its positional parameter between two states: retracted position during insertion and advanced position during operation. This parameter change allows the support to have different characteristics at different stages, reducing insertion force while maintaining rattle prevention.
2Ease of operation
If gap occupying part is retracted to reduce insertion force, then insertion workability is improved, but gap formation may cause instability
Solution Approach 1:
The gap occupying part dynamically transitions from retracted to advanced position after insertion. This dynamic behavior ensures that during insertion the part is retracted for easy operation, but after insertion it moves to advanced position to occupy the gap and ensure mounting stability, preventing both rattling and tilting.
Solution Approach 2:
The gap occupying part is designed to automatically move to the advanced position after insertion through elastic restoring force. This preliminary positioning action ensures that the gap is occupied and stability is maintained before any load is applied or collision occurs.
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
The solution effectively suppresses the increase in insertion force, prevents rattling, enhances mounting accuracy, and improves the headrest's ability to support occupants by maintaining contact points, reducing the likelihood of rearward tilt during collisions.
Implementation Method 1
the gap occupying part that moves pushes the inner surface of the support hole of the holder. Accordingly, even when the above gap is formed, it is possible to prevent a rattle caused by the gap. The gap occupying part may be formed integrally with the support so as to return to the advanced position with a restoring force of elastic deformation
Data Source
AI summary
A headrest is mounted to a seat back by inserting a support into a support hole of a holder and inserting a stay of the headrest into to stay hole of the support inserted into the support hole of the holder. A gap occupying part provided in the support moves between an advanced position at which the gap occupying part protrudes from an outer wall of the support and is capable of touching an inner surface of the support hole, and a retracted position at which the gap occupying part is retracted to an inner side of the stay hole from the advanced position. The gap occupying part moves toward the retracted position from the advanced position when the support is inserted into the support hole, and moves toward the advanced position when the stay is inserted into the stay hole.