Sun Visor Rib Structure for Lightweight Impact Resistance
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Vehicle sun visors require a lightweight yet high-strength design to absorb impact without breaking, while minimizing weight and maintaining functionality.
Innovation Solution
The sun visor design features a visor body with a first component having a high-strength bearing part and housing part connected via a connecting rib, allowing the support shaft to break before the visor body, while the second component has a simpler structure with reduced strength to minimize weight, utilizing coupling pins and boss parts for additional strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the visor body is made with high strength to prevent breakage during impact, then the strength is improved, but the weight increases
Solution Approach 1:
The visor body is divided into two components: a first component containing the bearing part and housing part that require high strength, and a second component that can be lighter. This segmentation allows different parts to have different strength requirements, optimizing the overall weight while maintaining necessary strength where needed.
Solution Approach 2:
The first component is designed with higher strength properties specifically where needed (at the bearing part and housing part that experience impact forces), while the second component can have lower strength properties since it doesn't bear the same loads. This local differentiation of quality allows weight reduction in non-critical areas while maintaining strength where required.
2Strength
If the bearing part and housing part are both provided in the first component and connected via connecting rib, then the strength of the first component is increased, but the structural complexity increases
Solution Approach 1:
The bearing part, housing part, and connecting rib are merged into a single integrated first component. This combining of multiple functional elements into one piece simplifies the overall structure by reducing the number of separate parts and assembly steps, while still providing the necessary strength through the integrated design.
3Weight of moving object
If the second component has a simple structure with reduced strength to minimize weight, then the weight is reduced, but the strength decreases
Solution Approach 1:
The second component is designed with reduced strength properties appropriate for its specific functional requirements, since it does not bear the same impact loads as the first component. This localized reduction in quality allows for significant weight reduction in this portion of the visor body without compromising the overall strength where it is most needed.
Data Source
AI summary
A vehicle sun visor includes a visor body and a support shaft that attaches the visor body to a ceiling surface of a vehicle cabin. The visor body includes a first component and a second component that are stacked in a thickness direction. The support shaft supports the visor body such that the visor body is rotatable between a service position and a storage position. The support shaft is rotatably supported by a bearing part provided in the first component. The first component is provided with a housing part that houses a mirror. The housing part and the bearing part are connected by a connecting rib that extends in a direction orthogonal to a longitudinal direction of the support shaft. The connecting rib, the bearing part, and the housing part are all provided in the first component.