Electric Connection Box Frame Cover Alignment
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Solution Overview
Problem
The existing electric connection boxes face inefficiencies in the assembly process of the frame and cover, particularly in aligning and fitting the guide protrusion portion into the guide groove, which can be time-consuming.
Innovation Solution
An electric connection box design featuring a frame with a cylindrical outer wall and a cover with a protruded portion having side portions and edge portions, where the edge portions have facing surfaces that align and position the cover relative to the frame, facilitating easier assembly by controlling the positional displacement and preventing erroneous fitting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a guide protrusion portion is guided by a guide groove configuration, then the cover can be positioned on the frame, but the assembly work takes time and efficiency is reduced
Solution Approach 1:
The protruded portion with facing surfaces is prepared in advance on the frame before assembly. This preliminary preparation allows the cover to be quickly and accurately positioned without requiring time-consuming alignment operations during assembly, thus resolving the contradiction between positioning precision and assembly efficiency
2Manufacturing precision
If a guide protrusion portion and guide groove configuration is used, then positioning is possible, but the assembly process becomes complex and time-consuming
Solution Approach 1:
The positioning function is segmented into two independent surfaces: the first facing surface for positioning in one direction and the second facing surface for positioning in another direction. This segmentation simplifies the overall assembly process by breaking down the complex alignment task into simpler, independent positioning actions, reducing assembly process complexity while maintaining alignment precision
Data Source
AI summary
An electric connection box includes a frame having a cylindrical outer wall, and a cover having a side wall fitted into one end in an axial direction of the outer wall. The outer wall has a plate-shaped protruded portion, and the protruded portion has a pair of side portions respectively placed at one end and the other end in a width direction. The side wall has a pair of edge portions and has a notch between the pair of edge portions. Each of the pair of edge portions has a first facing surface and a second facing surface. The first facing surface abuts on the pair of side portions in a thickness direction of the protruded portion, and the second facing surface faces the pair of side portions in the width direction and positions the cover with respect to the frame.