Two-Core Shielded Wire Routing via Short-Axis Bending

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

Two-core parallel shielded electric wires experience increased transmission loss due to bending, particularly in the long axis direction, which is necessary for space-saving routing in applications like automobiles, leading to suboptimal signal transmission characteristics.

Innovation Solution

The routing structure involves rerouting the two-core parallel shielded electric wire by bent twisting in the short axis direction at route change points along the long axis, limiting the number of route change points to 1.43 or less per meter, thereby minimizing transmission loss without bending in the long axis direction.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If the two-core parallel shielded electric wire is bent in the long axis direction to achieve space-saving routing, then the routing flexibility and space utilization are improved, but the transmission loss increases significantly

Engineering Contradiction:

Improverouting flexibilityVSAvoidtransmission loss

Core Design Contradiction:

Adaptability or versatilityVSLoss of energy

Solution Approach 1:

Instead of bending the wire in the long axis direction (conventional approach), the patent inverts the bending direction to the short axis direction. This inversion allows route changes while maintaining transmission characteristics, as the short axis bending does not create the same strain differential between the two cores that causes transmission loss.

Inventive Principle:

Principle #13The other way round (Inversion)

Solution Approach 2:

The patent introduces asymmetric routing by allowing bending only in the short axis direction rather than symmetrically in all directions. This asymmetric constraint prevents the long axis bending that causes transmission loss while still providing sufficient routing flexibility for space-saving installations.

Inventive Principle:

Principle #4Asymmetry

2Adaptability or versatility

If the number of route change points is increased to improve routing adaptability, then the wire can navigate complex paths, but the transmission loss increases by 10% or more

Engineering Contradiction:

Improverouting adaptabilityVSAvoidtransmission loss

Core Design Contradiction:

Adaptability or versatilityVSLoss of energy

Solution Approach 1:

The patent establishes a critical parameter threshold: the number of route change points per unit length must be 1.43 or less per meter. By controlling this parameter, the patent maintains transmission loss below 10%, balancing routing adaptability with signal quality preservation.

Inventive Principle:

Principle #35Parameter changes

3Reliability

If the wire is arranged to bend only in the short axis direction to minimize transmission loss, then transmission characteristics are maintained, but routing flexibility in space-constrained environments is reduced

Engineering Contradiction:

Improvetransmission characteristicsVSAvoidrouting flexibility

Core Design Contradiction:

ReliabilityVSAdaptability or versatility

Solution Approach 1:

The patent allows partial bending freedom by permitting route change points up to 1.43 per meter in the short axis direction. This partial permission provides sufficient routing flexibility for space-saving installations while maintaining transmission characteristics, as the limited number of bends does not accumulate enough strain to cause significant loss.

Inventive Principle:

Principle #16Partial or excessive action

Data Source

PatentEP3594970B1Routing structure of two-core parallel shielded electric wire

Publication Date: 2022.06.01 YAZAKI CORP

Figure 1
Figure 2~3
Figure 4

AI summary

A routing structure (1) of a two-core parallel shielded electric wire (10) includes: two insulated electric wires that are arranged in parallel; and a shield layer that is attached around the two insulated electric wires and extends in a longitudinal direction of the two insulated electric wires. In the routing structure, the two-core parallel shielded electric wire (10) is rerouted by bent twisting the two-core parallel shielded electric wire (10) in a short axis direction at a route change point (RCP) along a long axis direction of the two-core parallel shielded electric wire (10), and a number of bent twisted points in the short axis direction is 1.43 or less per meter.