Electrical Connection Box Cover Locking Mechanism
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Solution Overview
Problem
Conventional electrical connection boxes fail to securely fit the end of an exterior member, such as a corrugated tube, externally fitted to electric wires, leading to potential disengagement and water ingress.
Innovation Solution
An electrical connection box design featuring a casing with a stacked structure, an insertion port, and a cover member with locking units that interpose and hold the exterior member's end between the cover and the casing, along with a pressing wall that presses the end of the cover member toward the casing, ensuring a secure fit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional electrical connection box with a simple opening and protection cover is used, then the structure is simple and easy to manufacture, but the exterior member end cannot be firmly fitted, leading to potential disengagement and water ingress
Solution Approach 1:
The connection box is divided into multiple functional components: a casing with stacking members, a separate cover member with locking units, and a pressing wall mechanism. This segmentation allows each component to perform its specific function while maintaining overall structural integrity and fitting reliability
Solution Approach 2:
The exterior member end is interposed and held between the cover member and the first member before final locking occurs. The pressing wall pre-positions the end to be pressed, ensuring proper alignment and firm fitting before the locking units engage, preventing disengagement and water ingress
2Reliability
If the cover member is simply locked to the exterior installation unit, then the locking mechanism is simple, but the end of the exterior member is not securely held, allowing disengagement
Solution Approach 1:
Multiple securing functions are merged into a single integrated locking mechanism. The locking units both lock the cover member to the exterior installation unit and simultaneously secure the end of the exterior member by interposing it between the cover member and the first member, achieving dual functionality
Solution Approach 2:
The end of the exterior member acts as an intermediary element that is interposed between the cover member and the first member. This intermediary positioning ensures secure holding while allowing the locking units to engage properly, preventing disengagement without requiring complex additional mechanisms
Data Source
AI summary
An electrical connection box applied to a wire harness includes a casing and a cover member. The casing is provided with a first member that houses an electronic component and a second member and an insertion port formed on the first member, and an exterior installation unit formed outside the insertion port of the first member with an end of an exterior member of which being arranged in a stacking direction. The cover member has a pair of locking units, and is locked to the exterior installation unit via the pair of locking units and holds an end of the exterior member between the cover member and the first member. The second member includes a pressing wall that interposes an end to be pressed of the cover member between the pressing wall and the first member and that presses the end to be pressed toward the first member side.