Shield Conduction Path Waterproofing via Segmented Sealing
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Solution Overview
Problem
Conventional shield conduction paths are vulnerable to water ingress due to the elastic attachment of the cylindrical rubber member to the shield pipe, which can allow water to enter through gaps and flow along the outer peripheral surface, potentially reaching the inside of the shield pipe.
Innovation Solution
A shield conduction path design featuring a shield pipe with an obliquely opened connecting end portion, a flexible braided wire fastened by a swaging ring, a rubber shield grommet, a synthetic resin tube, and an adhesive tape wound in a liquid-tight manner to prevent water entry, ensuring a secure waterproof seal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the end portion of the cylindrical rubber member is closely attached to the outer periphery of the shield pipe only elastically, then the structure is simple and easy to manufacture, but water may enter through gaps between the rubber member and shield pipe, compromising waterproofing reliability
Solution Approach 1:
The waterproofing structure is divided into multiple segments: the cylindrical rubber member (first waterproofing means), the tube (second waterproofing means), and the adhesive tape (third waterproofing means). Each segment provides a layer of protection, creating multiple barriers against water ingress while maintaining manufacturing simplicity through modular assembly.
Solution Approach 2:
The waterproofing components are nested within each other: the tube surrounds the cylindrical rubber member, and the adhesive tape wraps around both the tube and rubber member. This nested configuration creates overlapping waterproof barriers that prevent water from reaching the shield pipe connection, enhancing reliability without significantly complicating manufacturing.
2Reliability
If multiple waterproofing components (shield grommet, tube, adhesive tape) are added to prevent water ingress, then waterproofing reliability is improved, but device complexity increases
Solution Approach 1:
The patent employs flexible waterproofing components: the cylindrical rubber member (shield grommet) made of elastic material, the flexible tube made of synthetic resin, and the adhesive tape. These flexible elements can conform to the shield pipe and surrounding structures, providing effective waterproofing while maintaining a relatively simple overall structure that is easy to install and integrate.
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 design effectively prevents water from reaching the connecting end portion of the shield pipe and shield member by directing water flow along the adhesive tape and tube peripheries, ensuring a reliable waterproof seal even when exposed to water.
Implementation Method 1
an adhesive tape wound in a liquid tight manner from an outer periphery of the upper end portion of the tube over an outer periphery of the shield grommet
Implementation Method 2
water, which reaches an upper end of the shield grommet along the outer periphery of the shield pipe, flows on the outer periphery of the shield grommet, the outer periphery of the adhesive tape, and the outer periphery of the tube
Data Source
AI summary
A connecting end portion of a shield pipe with respect to a shield member is waterproofed. A shield conduction path includes: a shield pipe having a connecting end portion opened obliquely downward; a braided wire fasten to an outer periphery of the portion by a swaging ring; a plurality of wires inserted into the pipe and braided wire; a rubber shield grommet and surrounding a fastening region between the braided wire and swaging ring; a binding band that fixes an upper end portion of the grommet to an outer periphery of the pipe in a liquid tight manner; a tube formed of synthetic resin surrounding the braided wire and having an upper end portion surrounding a lower end of the grommet; and exterior adhesive tape wound in a liquid tight manner from an outer periphery of the upper end portion of the tube over an outer periphery of the grommet.