Rotating Electrical Connection Box Cover with Anti-Detachment Projection
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Solution Overview
Problem
Existing electrical connection boxes for automobiles face issues where the cover may come off during rotational movement, leading to potential assembly failures and compromised waterproof integrity.
Innovation Solution
The design incorporates protrusions on the cover and matching engaging portions on the frame peripheral wall, with projections to prevent falling off and elastic packing for secure sealing, ensuring stable cover retention and waterproof capability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the cover is designed to rotate and cover the opening portion, then the ease of operation is improved, but the reliability deteriorates due to the risk of the cover coming off during rotational movement
Solution Approach 1:
The projection is formed on the protrusion in advance to create a hooking structure that prevents the cover from coming off during rotational movement. This preliminary structural preparation ensures that the anti-detachment function is already in place before operation begins
Solution Approach 2:
The projection acts as an intermediary element between the protrusion and the protrusion engaging portion, creating a hooking mechanism that mediates the connection and prevents detachment while allowing rotational movement
2Ease of operation
If the protrusion and protrusion engaging portion are designed for rotational movement, then the ease of operation is improved, but the stability deteriorates as the cover may fall off during movement
Solution Approach 1:
The projection is pre-formed on the protrusion to create a hooking structure that maintains stability during rotational movement, preventing the cover from falling off while allowing ease of operation
3Ease of manufacture
If the cover is made as a separate component for rotational movement, then the ease of manufacture is improved, but the reliability deteriorates due to the risk of detachment
Solution Approach 1:
The projection is formed on the protrusion in advance to create a hooking structure that prevents detachment, allowing the cover to be manufactured as a separate component while maintaining reliability
Solution Approach 2:
The projection serves as an intermediary element that connects the separately manufactured cover to the frame, enabling both ease of manufacture and reliability through the hooking mechanism
Data Source
AI summary
A wire harness arranged in a vehicle has an electrical connection box at the terminal thereof. The electrical connection box includes an electronic component block to which a plurality of electronic components are assembled and a casing to be an assembly destination of the electronic component block. The casing has a structure in which an upper opening portion surrounded by an edge of a frame peripheral wall is rotatably moved and covered by a separate upper cover. In the casing, a protrusion is formed on one of the frame peripheral wall or the upper cover. On the other thereof, a protrusion engaging portion is formed with respect to the protrusion. The protrusion is formed so as to be engaged with the protrusion engaging portion in an inserted state. In such protrusion, a projection is integrally formed so as to at least prevent the upper cover from coming off.