Shielded Cable Waterproofing via Resin-Filled Braided Wire

Solution Overview

Problem

Conventional waterproofing structures for shielded cables in vehicles are complex, costly, and heavy due to the need for multiple parts and increased man-hours, particularly relying on rubber waterproofing plugs that complicate the design.

Innovation Solution

A waterproofing structure for shielded cables that uses a braided wire as a shielding member, with a waterproofing filler such as thermoplastic resin or swelling agents applied to the gaps between the braided wire strands and a grommet, eliminating the need for additional components like rubber plugs, thereby simplifying the design and reducing parts and labor costs.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a rubber waterproofing plug is used to cover the waterproofed portion of the shielded cable, then waterproofing reliability is improved, but the number of parts increases, manufacturing cost increases, and the structure becomes more complex and heavier

Engineering Contradiction:

Improvewaterproofing reliabilityVSAvoidstructure complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The invention extracts and eliminates the rubber waterproofing plug from the shielded cable structure. Instead of using a separate plug component, the waterproofing function is integrated directly into the braided wire by filling its gaps with waterproofing filler, thereby removing the unnecessary component while maintaining waterproofing effectiveness.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The invention merges the waterproofing function with the braided wire structure. The waterproofing filler is incorporated into the gaps of the braided wire, combining the shielding function and waterproofing function into a single integrated structure, eliminating the need for separate waterproofing components.

Inventive Principle:

Principle #5Merging (Combining)

2Reliability

If a rubber waterproofing plug is used to cover the waterproofed portion of the shielded cable, then waterproofing reliability is improved, but the number of parts increases and manufacturing cost increases

Engineering Contradiction:

Improvewaterproofing reliabilityVSAvoidnumber of parts

Core Design Contradiction:

ReliabilityVSQuantity of substance

Solution Approach 1:

The invention extracts and eliminates the rubber waterproofing plug from the shielded cable structure. Instead of using a separate plug component, the waterproofing function is integrated directly into the braided wire by filling its gaps with waterproofing filler, thereby removing the unnecessary component while maintaining waterproofing effectiveness.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The invention merges the waterproofing function with the braided wire structure. The waterproofing filler is incorporated into the gaps of the braided wire, combining the shielding function and waterproofing function into a single integrated structure, eliminating the need for separate waterproofing components.

Inventive Principle:

Principle #5Merging (Combining)

3Reliability

If a rubber waterproofing plug is used to cover the waterproofed portion of the shielded cable, then waterproofing reliability is improved, but the structure becomes heavier

Engineering Contradiction:

Improvewaterproofing reliabilityVSAvoidcable weight

Core Design Contradiction:

ReliabilityVSWeight of moving object

Solution Approach 1:

The invention extracts and eliminates the rubber waterproofing plug from the shielded cable structure. Instead of using a separate plug component, the waterproofing function is integrated directly into the braided wire by filling its gaps with waterproofing filler, thereby removing the unnecessary component while maintaining waterproofing effectiveness.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The invention merges the waterproofing function with the braided wire structure. The waterproofing filler is incorporated into the gaps of the braided wire, combining the shielding function and waterproofing function into a single integrated structure, eliminating the need for separate waterproofing components.

Inventive Principle:

Principle #5Merging (Combining)

4Reliability

If a rubber waterproofing plug is used to cover the waterproofed portion of the shielded cable, then waterproofing reliability is improved, but the number of parts increases and man-hours increase

Engineering Contradiction:

Improvewaterproofing reliabilityVSAvoidmanufacturing efficiency

Core Design Contradiction:

ReliabilityVSProductivity

Solution Approach 1:

The invention extracts and eliminates the rubber waterproofing plug from the shielded cable structure. Instead of using a separate plug component, the waterproofing function is integrated directly into the braided wire by filling its gaps with waterproofing filler, thereby removing the unnecessary component while maintaining waterproofing effectiveness.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The invention merges the waterproofing function with the braided wire structure. The waterproofing filler is incorporated into the gaps of the braided wire, combining the shielding function and waterproofing function into a single integrated structure, eliminating the need for separate waterproofing components.

Inventive Principle:

Principle #5Merging (Combining)

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

This solution reduces the number of parts and man-hours required, making the structure more compact and lighter while effectively preventing water infiltration, thus lowering costs and enhancing the overall efficiency of the waterproofing system.

Implementation Method 1

A waterproofing filler is disposed on at least one of an inner side and an outer side of a waterproofed portion of the braided wire. At least gaps between a plurality of strands of the braided wire out of the gaps between the plurality of strands of the braided wire and a gap between the braided wire and the waterproofing member are filled with the waterproofing filler.

Methodology Applied

Scientific EffectCapillary action: Capillary Action

Implementation Method 2

filling at least gaps between a plurality of strands of the braided wire out of the gap between the plurality of strands of the braided wire and a gap between the braided wire and the waterproofing member with the waterproofing filler

Methodology Applied

Scientific EffectAdhesion: Adhesive

Data Source

PatentUS11177056B2Waterproofing structure and waterproofing method for shielded cable

Publication Date: 2021.11.16 YAZAKI CORP

AI summary

A waterproofing structure for shielded cable includes: a shielded cable including one or more cables and a braided wire serving as a shielding member and covering the cables; and a grommet serving as a waterproofing member covering a waterproofed portion of the braided wire. Thermoplastic resins serving as waterproofing fillers are respectively disposed on an inner side and an outer side of the waterproofed portion of the braided wire. The gaps between the plurality of strands of the braided wire and the gap between the braided wire and the small-diameter cylindrical portion of the grommet are filled with the thermoplastic resin melted by heating.