Headrest Support Tube Structure for Load-Induced Deformation
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Solution Overview
Problem
Conventional headrest support structures in vehicles experience deformation when a load is applied, particularly from the stay extending downward from the headrest, which compromises their rigidity and stability.
Innovation Solution
The headrest support structure incorporates a tubular portion with projection and connection portions that are strategically arranged to enhance rigidity, including first to third projection portions and connection portions, which are designed to be flush with each other and integrated into the tubular shape, providing additional support and preventing deformation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a simple tubular support structure is used, then the device complexity is reduced and manufacturing is easier, but the rigidity and resistance to deformation deteriorate when load is applied
Solution Approach 1:
The tubular portion is designed with projection portions at specific locations (upper part, middle part, lower part) that create local structural variations. These projection portions protrude inward to provide localized reinforcement where loads are applied, while the majority of the tubular structure remains simple and lightweight. This resolves the contradiction by adding complexity only where necessary to improve rigidity.
Solution Approach 2:
The tubular portion is segmented into multiple functional zones by the projection portions, which divide the structure into distinct sections (upper, middle, lower). Each projection portion acts as an independent reinforcement element that can be optimized for specific load conditions, allowing the overall structure to achieve high rigidity without requiring complete structural complexity throughout.
2Strength
If projection portions are added to the tubular portion, then the rigidity is improved and deformation is suppressed, but the device complexity and manufacturing difficulty increase
Solution Approach 1:
The projection portions are integrated directly into the tubular portion as a unified structure, eliminating the need for separate reinforcement components. This merging of the projection portions with the main tubular body simplifies manufacturing by allowing the entire assembly to be produced as a single piece or pre-assembled unit, reducing the number of parts and assembly steps despite the enhanced structural complexity.
3Reliability
If multiple projection portions are strategically arranged, then the deformation suppression is enhanced and reliability is improved, but the device complexity increases
Solution Approach 1:
Projection portions are positioned at specific locations (upper part, middle part, lower part) where loads are most likely to be applied. This localized reinforcement strategy provides high reliability at critical stress points without requiring uniform complexity throughout the entire structure. The projection portions create local structural variations that precisely address the load distribution patterns.
Solution Approach 2:
The projection portions extend in the radial dimension (inward from the outer surface) to create three-dimensional structural reinforcement. This adds a dimensional element to the otherwise simple tubular structure, providing enhanced rigidity and load distribution capabilities without significantly increasing overall structural complexity. The projection portions utilize the radial dimension to create effective reinforcement with minimal material addition.
Data Source
AI summary
It is to suppress the deformation of a tubular support. A headrest support structure includes: a stay extending downward from a headrest; a bracket provided to a backrest so as to be formed in a tubular shape, and extending vertically; a tubular portion having an insertion hole in which the stay is inserted, the tubular portion being fitted into the bracket, and extending vertically; a first projection portion projecting from an outer peripheral surface of an upper part of the tubular portion, and facing to an inner surface of the bracket; a second projection portion projecting from the outer peripheral surface of a middle part in an up-and-down direction of the tubular portion, and facing to the inner surface of the bracket; a third projection portion projecting from the outer peripheral surface of a lower part of the tubular portion, and facing to the inner surface of the bracket; a first connection portion located between the first projection portion and the second projection portion; and a second connection portion located between the second projection portion and the third projection portion.