Vehicle Sun Visor Reinforcement Ribs Mirror Detachment
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Solution Overview
Problem
Conventional vehicle sun visors lack planar rigidity, leading to stress concentration at mirror corners when impacted from the lower edge, which can result in the mirror detaching and flying off during accidents.
Innovation Solution
The vehicle sun visor incorporates reinforcement ribs and bosses in the lower surface area, with a greater plate thickness in the middle reinforcement part, and additional reinforcement ribs and bosses that cross each other, enhancing planar rigidity and preventing mirror detachment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the sun visor body is made lightweight and simple in structure, then manufacturing cost and ease of manufacture are improved, but planar rigidity deteriorates, leading to stress concentration at mirror corners during impact
Solution Approach 1:
The patent applies local quality by providing reinforcement ribs only in the lower surface area below the mounting part, rather than reinforcing the entire sun visor body. This localized reinforcement increases planar rigidity where it is most needed to prevent mirror detachment during impact, while keeping other areas lightweight and simple for easy manufacture.
Solution Approach 2:
The reinforcement structure is segmented into multiple parallel reinforcement ribs spaced at predetermined intervals, rather than using a single solid reinforcement. This segmentation provides adequate rigidity while reducing material usage and maintaining ease of manufacture compared to a fully solid structure.
2Reliability
If reinforcement structures are added to improve planar rigidity, then mirror detachment is prevented, but device complexity increases
Solution Approach 1:
Reinforcement ribs are provided only in the lower surface area below the mounting part where stress concentration occurs during impact, rather than throughout the entire sun visor body. This localized approach improves mirror attachment reliability while minimizing structural complexity in non-critical areas.
Solution Approach 2:
The reinforcement is divided into multiple discrete parallel ribs with spaces between them, rather than a continuous solid structure. This segmentation achieves the necessary rigidity to prevent mirror detachment while keeping the overall structure simpler and easier to manufacture than a fully solid reinforcement.
Data Source
AI summary
A vehicle sun visor includes a sun visor body supported with respect to a vehicle ceiling so as to be freely rotated between a storage position and a use position, and a mirror mounted in a mounting part provided in the sun visor body. If an area that is a part below the mounting part of the surface of the sun visor body located in the use position is designated a lower surface area, a plurality of reinforcement ribs extending in a short-axis direction of the sun visor body are provided in the lower surface area in parallel with one another at a predetermined interval in the long-axis direction of the sun visor body. The predetermined interval is shorter than a distance in a short-axis direction of the lower surface area.