Electric Connection Box Lid Notch Design for Sealing
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Solution Overview
Problem
Existing electric connection boxes face issues with the hook mechanism becoming unlocked during both rotational and vertical fitting, leading to decreased water tightness due to interference between the lid's inner wall and the housing's side wall, which compromises the sealing performance.
Innovation Solution
The electric connection box design incorporates a polygonal opening housing with a lock protruding plate, a frame-shaped hook, and an inner wall with notches on the lid, allowing for secure engagement and locking in both fitting modes while maintaining watertight sealing through the use of a packing mechanism that prevents interference between the inner wall and the housing's side wall.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the hook is elastically deformed outward during vertical fitting, then the inner hole can be engaged with the lock protruding plate, but the inner wall of the lid is pulled and moved outward causing interference with the housing side wall and potential unlocking
Solution Approach 1:
The inner wall is divided into multiple sections with notches created at specific positions. These notches segment the inner wall structure, allowing it to flex locally during hook engagement while maintaining overall structural integrity and preventing the entire inner wall from being pulled outward and interfering with the housing side wall.
Solution Approach 2:
The notches are strategically positioned at specific locations on the inner wall where local flexibility is needed during vertical fitting. This creates local quality variations in the inner wall structure, allowing controlled deformation at notch positions while maintaining rigidity in other areas to prevent interference with the housing side wall.
2Object-affected harmful factors
If the inner wall is made shorter to avoid interference with the housing side wall, then interference is reduced, but the packing may be separated from the packing abutment end surface resulting in decreased water tightness
Solution Approach 1:
The notches are pre-formed on the inner wall at positions that anticipate the deformation needs during vertical fitting. This preliminary structural preparation allows the inner wall to flex appropriately during assembly without needing to be made shorter, thereby maintaining both interference avoidance and proper packing engagement for water tightness.
Solution Approach 2:
The notches modify the physical parameters of the inner wall by creating localized flexibility zones. This changes the deformation characteristics of the inner wall, allowing it to accommodate hook engagement forces without requiring a shorter overall length, thus maintaining both interference avoidance and sealing effectiveness.
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
The solution ensures reliable locking of the hook in both rotational and vertical fitting scenarios, enhancing the waterproof performance by preventing interference between the inner wall and the housing's side wall, thus maintaining a stable sealing surface.
Implementation Method 1
the lid 505 is rotated about the hook 507 in a frontward direction f
Implementation Method 2
The hook 507 pressed against the lock protruding plate 509 from right above is elastically deformed outward
Data Source
AI summary
An electric connection box includes a housing having an opening defined by an upper end of side walls, a lock protruding plate, a lid including a hanging wall and to be attached to the housing, a hook, an inner wall protruding from the lid and a notch being obtained by cutting a lower tip end of the inner wall. The hanging wall is, when the lid is attached to the housing, to cover an outer side of side walls. The hook is to rotate the lid such that the lid is attached to the housing. The inner wall is to, when the lid is attached to the housing, to sandwich the one of the plurality side walls between the hanging wall. The notch is formed on the inner wall in a second portion corresponding to a first portion of the hanging wall on which the hook is provided.