Fuse Unit Rotation Regulating Part Miniaturization
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Solution Overview
Problem
Existing fuse units for vehicles face challenges in miniaturization and assemblability due to the thickness of the rotation regulating part, which increases the size of the fuse housing and leads to molding strain, affecting the connection with the battery.
Innovation Solution
A fuse unit design featuring a metal plate-based rotation regulating part with a terminal abutting part formed by folding one edge of the external connection plate and a resin-made cover part, which provides higher strength and insulation without increasing the unit's size, preventing short circuits and molding strain.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a resin-made wall is used as the rotation regulating part to stop rotation of the screw terminal fitting, then the rotation can be regulated, but the thickness dimension must be set at a large value to ensure strength, causing upsizing of the fuse housing and potential molding strain
Solution Approach 1:
The invention changes the material parameter from resin to metal for the rotation regulating part. The metal plate-based structure provides higher strength per unit thickness, allowing the thickness dimension to be reduced while maintaining sufficient strength to stop rotation of the screw terminal fitting, thereby preventing upsizing of the fuse housing
Solution Approach 2:
The invention uses a composite structure combining metal plate (for strength) and resin cover (for insulation and protection). The metal plate provides the necessary mechanical strength for rotation regulation, while the resin cover adds insulation properties, allowing for a thinner overall design without compromising strength
2Strength
If the thickness dimension of the rotation regulating part is increased to ensure strength, then the strength is improved, but molding strain occurs in the fuse housing and assemblability to the battery decreases
Solution Approach 1:
The invention changes the material parameter from resin to metal for the rotation regulating part. Metal provides higher strength per unit thickness, allowing the use of a thinner plate that avoids creating local thick-wall conditions in the fuse housing, thereby preventing molding strain while maintaining sufficient strength
3Volume of stationary object
If a metal plate-based rotation regulating part is used to downsize the unit, then the size is reduced and molding strain is prevented, but insulation properties may be compromised
Solution Approach 1:
The invention uses a composite structure where a metal plate provides the rotation regulating function with thin profile, while a resin cover is added to provide electrical insulation. This combination allows downsizing of the fuse housing while preventing short circuits through the insulating resin cover
Data Source
AI summary
A fuse unit for connecting a battery, including a fuse element having an external connection plate part to which a screw terminal fitting is screwed, a resin-made fuse housing for supporting the fuse element, and a rotation regulating part for stopping rotation of the screw terminal fitting screwed to the external connection plate part, the rotation regulating part includes a terminal abutting part which is formed by folding one edge of the external connection plate part and stops the rotation by abutting on one side edge of the screw terminal fitting, and a cover part which is formed integrally to the fuse housing and covers a back surface of the terminal abutting part.