Fusible Link Unit Hinge Section Stress Reduction
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional fusible link units face issues with positional variability and stress concentration on the hinge section due to bending, leading to potential deformation, disconnection, and reduced strength, making them unsuitable for low current applications.
Innovation Solution
The fusible link unit incorporates recessed and projected guides near the hinge section to maintain consistent positional relationships between bodies, reducing stress on the hinge and enhancing overall strength, with engagement units ensuring proper alignment and locking without requiring precise dimensional fitting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the two bodies are pivoted at the hinge section to determine positional relationship, then the unit can be assembled with flexible positioning, but the positional relationship varies significantly depending on bending manner, causing connection issues and stress concentration
Solution Approach 1:
The patent introduces engagement units as intermediary components between the two bodies. These engagement units include engagement protrusions and engagement recesses that mate together to maintain a fixed positional relationship between the two bodies after pivoting, eliminating the variability caused by different bending manners while preserving assembly flexibility
Solution Approach 2:
The engagement units are designed to be engaged after pivoting to preliminarily establish and maintain the positional relationship. By performing the engagement action after pivoting, the system ensures proper alignment while preventing subsequent positional drift, thus resolving the contradiction between assembly flexibility and positional stability
2Strength
If the plate thickness of the busbar is increased to reduce stress concentration on the hinge section, then the overall strength increases, but the fusible link unit cannot be applied to low current fuse applications
Solution Approach 1:
The patent segments the structural support function from the stress concentration points by introducing engagement units at positions distant from the hinge section. This segmentation allows the busbar to maintain adequate strength without requiring excessive thickness, as the engagement units provide additional support points that distribute mechanical loads away from the hinge section, enabling use in low current applications
3Strength
If engagement units are provided at positions distant from the hinge section, then stress on the hinge section is reduced, but the positional relationship between bodies may become unstable without proper guiding near the hinge section
Solution Approach 1:
The patent introduces recessed and projected guides as intermediary guiding features near the hinge section. These guides work in conjunction with the engagement units positioned distant from the hinge, providing the necessary positional stability during assembly while allowing the engagement units to reduce stress on the hinge section by distributing loads away from it
Data Source
AI summary
A hinge section including bending sections at both side edges of a band plate section is provided in center of a busbar. On both sides of the hinge section, two fuse circuit constituting plate sections are integrally formed to be linked thereto. Two resin housings are assembled by insert molding to the respective fuse circuit constituting plate sections, thus forming two bodies. The two bodies are pivoted in the same direction at the bending sections, and engagement units are locked, thus constituting a fusible link unit having a U-shaped plan view. The two bodies are engaged with each other in vicinity areas of the hinge section in the opposed surfaces of the opposed resin housing when the two bodies are pivoted. The fusible link unit also includes recessed and projected guides guiding the two resin housings to proper positions.