Vehicle Sun Visor Shell Reinforcing Portions for Stress Distribution

Solution Overview

Problem

The existing sun visor for vehicles experiences cracks and abnormal noise due to stress when pins are press-fitted into bosses, and the pins can be inclined or broken due to radial stress, leading to durability issues in the joining structure.

Innovation Solution

The sun visor incorporates reinforcing portions on the shells to absorb and distribute radial stress, preventing expansion and inclination of the boss and pin, thereby enhancing the durability of the joining structure through integral molding or additional reinforcement methods.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Strength

If pins are press-fitted into bosses to join shells, then the shells are securely connected, but cracks form in the boss and abnormal noise occurs due to stress

Engineering Contradiction:

Improvejoining strengthVSAvoiddurability of joining structure

Core Design Contradiction:

StrengthVSReliability

Solution Approach 1:

The patent applies local quality by adding reinforcing portions specifically at the boss and pin locations where stress concentrates during press-fitting. These localized reinforcements strengthen the critical areas without requiring overall thickening of the shell members, thus preventing cracks in the boss and inclination of pins while maintaining manufacturing efficiency.

Inventive Principle:

Principle #3Local quality

2Reliability

If reinforcing portions are added to shells, then durability of joining structure is improved, but device complexity increases

Engineering Contradiction:

Improvedurability of joining structureVSAvoidstructural complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent applies merging by integrating the reinforcing portions directly into the shell members through integral molding. The reinforcing portions are formed as continuous structures with the shell members, eliminating the need for separate reinforcement components and their associated fastening operations, thus improving durability without significantly increasing device complexity.

Inventive Principle:

Principle #5Merging (Combining)

3Productivity

If integral molding is used for pin and boss, then manufacturing efficiency is improved, but stress concentration and crack formation occur

Engineering Contradiction:

Improvemanufacturing efficiencyVSAvoiddurability of joining structure

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The patent applies local quality by adding reinforcing portions specifically at the boss and pin locations where stress concentrates during press-fitting. These localized reinforcements strengthen the critical areas without requiring overall thickening of the shell members, thus preventing cracks in the boss and inclination of pins while maintaining manufacturing efficiency.

Inventive Principle:

Principle #3Local quality

Data Source

PatentUS8419105B2Sunvisor for vehicle

Publication Date: 2013.04.16 KYOWA SANGYO

AI summary

A sun visor for a vehicle has a sun visor body including a first shell and a second shell. The first shell includes a pin, and the second shell includes a boss having an insert hole. Further, a first reinforcing portion that extends in a given direction from at least one of the pin and the boss and a second reinforcing portion that extends in a direction intersecting with the direction of extension of the first reinforcing portion are provided.