Electronic Part Unit Shortcircuit Prevention Cover
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Solution Overview
Problem
Existing electronic part equipped units are prone to shortcircuits due to conductivity of foreign matter contacting welded portions on vehicles, as they lack effective protection for through holes and welding holes.
Innovation Solution
Incorporating a shortcircuit preventing cover that covers the bottom and side walls of the case body, including an inserting portion to cover the connecting portion of leads and ground terminals, and a portion opposing the bottom wall to cover welding holes, thereby preventing foreign matter from reaching these areas.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If welding is applied to connect leads to terminals, then connection stability is improved, but shortcircuit risk increases due to exposed welding holes
Solution Approach 1:
The patent introduces a cover member as an intermediary component that covers the welding holes after welding is completed. This cover member acts as a mediator between the welded connection (which requires open holes for welding access) and the external environment (which could cause shortcircuits through conductive foreign matter). The cover member includes through holes that allow welding access from one side while preventing foreign matter entry from the other side.
Solution Approach 2:
The patent applies preliminary action by pre-forming through holes in the cover member at positions corresponding to the welding holes in the case body, before the actual welding operation. This preliminary preparation ensures that after welding is completed, the cover member can immediately be positioned to cover and protect the welding holes, preventing shortcircuit risks without requiring additional post-welding operations.
2Ease of manufacture
If through holes are formed for welding access, then welding operation is enabled, but foreign matter can enter and cause shortcircuits
Solution Approach 1:
The patent segments the protection function by separating the welding access function (through holes in the case body) from the protection function (cover member). The case body maintains through holes for welding accessibility, while the cover member provides a separate protective layer that can be positioned after welding. This segmentation allows each component to fulfill its specific function without compromising the other.
Solution Approach 2:
The patent implements a nested structure where the cover member is positioned over the case body, with the cover member's through holes aligned with and covering the case body's welding holes. This nested arrangement allows the smaller cover member to protect the larger case body's vulnerable welding holes while maintaining the overall structural integrity and functionality of the electronic part equipped unit.
Data Source
AI summary
An electronic part equipped unit includes a case body having a first recess portion for containing an electronic part and a second recess portion for containing a relay terminal and a ground terminal which are connected to the electronic part through leads, a wire side terminal to which a middle portion of a wire is attached, a cover member to which the wire side terminal is attached, and a shortcircuit preventing cover that covers a bottom wall and a side wall of the case body at a position corresponding to the second recess portion. The wire side terminal is brought into contact with the relay terminal when the cover member to which the wire side terminal is attached is fitted to the second recess portion of the case body.