Offset Layered Fusible Link for Automotive Fuse Circuit
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Solution Overview
Problem
The compact design of fusible links in automotive electrical circuits poses a challenge as the close spacing of fuse circuits leads to adjacent fusible portions being affected by heat from an overcurrent, resulting in reduced fusing time and unreliable operation.
Innovation Solution
The fusible link design includes offsetting the fusible portions of adjacent fuse circuits perpendicularly to the layering direction, along with offsetting the connection plates, to minimize heat transfer and maintain a compact structure, allowing for reliable fusing time and easy inspection and maintenance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the fuse circuits are layered with a smaller space therebetween to achieve a compact fusible link, then the housing depth is reduced, but the fusible portions of adjacent fuse circuits come close to each other causing heat transfer that reduces fusing time and reliability
Solution Approach 1:
The fusible portions of adjacent layered fuse circuits are offset from each other in a direction perpendicular to the layering direction. This spatial offset in the third dimension (width direction) prevents direct heat transfer between adjacent fusible portions while maintaining compact vertical layering, thus resolving the contradiction between compact housing depth and reliable fusing time
2Reliability
If the fusible portions of adjacent fuse circuits are offset perpendicularly to the layering direction, then heat transfer between adjacent circuits is reduced and fusing time is maintained, but the connection plates must also be offset increasing structural complexity
Solution Approach 1:
The connection plates are segmented with cutouts positioned at the locations where fusible portions are offset. This segmentation allows each connection plate to be independently formed with the specific offset pattern needed for its associated fusible portion, reducing the complexity of creating a single complex unified connection plate structure
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This design ensures stable and reliable operation of fusible portions by reducing heat transfer between adjacent circuits, maintaining a compact form while ensuring appropriate fusing time and facilitating easy maintenance by allowing simultaneous visibility of upper and lower fusible portions.
Implementation Method 1
When a fusible portion is fused by an overcurrent running in one of the electric circuits
Implementation Method 2
the heat generated by a fusible portion of a lower one of the fuse circuits has a less effect on a fusible portion of an upper one of fuse circuits
Data Source
AI summary
A plurality of fuse circuits are layered with a space therebetween in a housing. A fusible portion of one of the layered fuse circuits is offset from a fusible portion of an adjacent one of the layered fuse circuits perpendicularly to a direction in which the fuse circuits are layered. A connection plate of one of the layered fuse circuits is offset from a connection plate of an adjacent one of the layered fuse circuits perpendicularly to a direction in which the fuse circuits are layered. The connection plate has a U-shaped extended portion.