Electrical Junction Box Bus Bar Protection Segmentation
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Solution Overview
Problem
Conventional electrical junction boxes face challenges in protecting bus bars while maintaining a compact size, as they require deep slits or increased block sizes to cover the bus bar, leading to strength and accuracy issues.
Innovation Solution
The electrical junction box design features a terminal reception part that allows the bus bar to protrude and be covered by a U-shaped protector within the casing, eliminating the need for deep slits and enabling compactness, with separate dies for the terminal reception part and casing for easier maintenance and material flexibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the bus bar is completely covered by the insulating block, then the bus bar is protected from exposure, but the insulating block size increases
Solution Approach 1:
The protection function is segmented between two components: the insulating block provides partial coverage, while a dedicated protector component provides protection for the protruding end portion. This segmentation allows each component to be optimized independently, preventing the insulating block from needing to be oversized while still achieving complete bus bar protection.
Solution Approach 2:
A protector component is introduced as an intermediary element between the bus bar and the external environment. This mediator specifically covers the protruding end portion of the bus bar, enabling the insulating block to maintain a compact size while the bus bar remains fully protected through the combined action of both components.
2Reliability
If a deep slit is formed in the insulating block to receive the bus bar, then the bus bar can be inserted and protected, but the insulating block strength and manufacturing accuracy deteriorate
Solution Approach 1:
The protection function for the bus bar end portion is extracted from the insulating block structure and implemented by a separate protector component. This extraction eliminates the need to form deep slits in the insulating block, thereby preserving the block's structural strength and manufacturing accuracy while still enabling bus bar insertion and protection.
Solution Approach 2:
The protector acts as an intermediary that receives and protects the bus bar end portion without requiring structural modifications to the insulating block. This intermediary component solves the insertion and protection needs while maintaining the integrity of the insulating block.
3Reliability
If the insulating block covers the whole bus bar, then the bus bar is protected, but the terminal reception part size increases
Solution Approach 1:
The terminal reception part is segmented into functional zones: the insulating block handles the main body and connection terminals, while the protector handles the bus bar end portion. This segmentation allows the terminal reception part to remain compact while achieving complete bus bar protection through coordinated coverage by both components.
Solution Approach 2:
Instead of increasing the insulating block's coverage in all dimensions, the solution adds protection in a different dimension by introducing the protector component that specifically addresses the protruding end portion. This dimensional approach allows compact overall design while maintaining complete protection.
Data Source
AI summary
Provided is an electrical junction box that enables appropriate protection of a bus bar and also enables downsizing. The electrical junction box includes a terminal reception block (11) that accommodates a connection terminal, and a casing (12) that accommodates the terminal reception block (11). The terminal reception block (11) is configured such that a bus bar (19) is inserted into the terminal reception block (11) and an end portion of the bus bar (19) at the side opposite to the direction of insertion protrudes from the terminal reception block (11). The casing (12) includes a protector (20) that is configured to cover the end portion of the bus bar (19) protruding from the terminal reception block (11). Making the terminal reception block (11) accommodated in the casing (12) causes the end portion of the bus bar (19) to be covered with the protector (20).