Wire Harness Bracket Projecting Piece Prevents Shield Shell Pivoting
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Solution Overview
Problem
The existing wire harness design leads to decreased working efficiency during attachment due to the shield shell's tendency to pivot and become displaced from its correct position, requiring visual alignment and manual adjustment.
Innovation Solution
A wire harness design featuring a metal bracket with a projecting piece that restricts pivoting of the housing, combined with a braided member and crimping ring for enhanced electromagnetic shielding and secure attachment, ensuring the shield shell remains aligned and fixed correctly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the bracket covers the entire periphery of the holder and the shield shell covers only the side opposite to the case, then the structure is simple and easy to manufacture, but the housing can easily pivot about the bracket and the shield shell may be displaced from its correct position
Solution Approach 1:
The projecting piece is designed to preemptively prevent the pivoting motion before it can occur. By extending from the tubular portion toward the hood, it creates a mechanical stop that counteracts the tendency of the housing to rotate about the bracket, thereby maintaining alignment precision without complicating the manufacturing process
Solution Approach 2:
The projecting piece acts as an intermediary element between the bracket and the hood. It transfers and distributes the mechanical constraints, preventing direct contact and potential damage while maintaining the desired positional relationship between components
2Device complexity
If the shield shell is fixed to the case by bolts after terminal connection, then the assembly sequence is simple, but visual alignment is required which decreases working efficiency
Solution Approach 1:
The projecting piece performs the alignment function in advance, before the bolting operation. By pre-establishing the correct positional relationship between the shield shell and housing through mechanical constraint, it eliminates the need for visual alignment during the actual assembly process, thereby improving working efficiency without increasing assembly complexity
Solution Approach 2:
The bracket assembly with the projecting piece serves its own alignment function without requiring external alignment tools or operator skill. The mechanical constraint automatically guides the components into the correct position, making the assembly process self-aligning and thereby improving productivity
Data Source
AI summary
A wire harness includes a resin housing that includes a holding part that holds a terminal and an electric wire and a hood part that has an opening that exposes the terminal there inside, a metal shield shell that covers the holding part and is fixed to a case of an apparatus, and a metal bracket that covers the holding part and is attached to the shield shell. The shield shell opens toward the case and covers the holding part from the side opposite the case. The bracket has a cylindrical part through which the holding part is inserted, and a protruding piece that protrudes from the cylindrical part toward the hood part and is positioned on the side opposite the shield shell with the holding part therebetween.