Two-Layer Multi-Strand Cable for Flexible Tire Reinforcement
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Solution Overview
Problem
Existing cables used in tire reinforcement are rigid, leading to increased sensitivity to aggression at the tire's center and inadequate flexibility, which compromises the tire's endurance performance, especially its resistance to cleavage.
Innovation Solution
A two-layer multi-strand cable design with helically wound inner and outer layers of metallic wires, providing a structural elongation of at least 1.0% to enhance flexibility and metal mass while maintaining sufficient breaking strength, achieved through a specific winding configuration and composition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If rigid cables with low structural elongation are used, then breaking strength is sufficient, but flexibility is reduced and sensitivity to aggression increases
Solution Approach 1:
The cable is segmented into multiple independent strands (at least 7 strands) wound helically around a central element. Each strand contains multiple wires that can deform independently, allowing the cable to maintain overall strength while gaining flexibility. The segmentation enables each strand to accommodate deformation without compromising the entire cable's breaking strength.
Solution Approach 2:
The cable structure transitions from a rigid configuration to a dynamic one where strands and wires can move relative to each other during deformation. The helical winding arrangement allows strands to unwind and redistribute stress dynamically, enabling the cable to achieve structural elongation of at least 1.0% while maintaining breaking strength through progressive deformation of individual wires.
2Force
If rigid cables are used to relieve tension on working layers, then tension relief is achieved, but circumferential rigidity increases leading to sensitivity to aggression
Solution Approach 1:
The cable incorporates local quality variations through strands with different construction characteristics. Some strands have tighter wire arrangements for strength, while others have more flexible configurations. This local differentiation allows the cable to provide tension relief in specific areas while maintaining overall flexibility to reduce sensitivity to localized aggression in the apex block.
3Ease of operation
If thin wires are used, then flexibility in bending is improved, but metal mass and breaking strength are reduced
Solution Approach 1:
The cable employs a composite structure combining multiple thin wires within each strand, and multiple strands within the cable. This composite architecture allows the use of thin individual wires for flexibility while the collective arrangement of numerous wires and strands provides sufficient metal mass and breaking strength. The composite structure enables both thin wire flexibility and overall cable strength to coexist.
Data Source
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AI summary
The invention relates to a multi-strand cable (50) with two multi-strand layers, the cable (50) comprising: - an inner layer (CI) of the cable, made up of X = 1 multi-strand (M1) comprising K > 1 strands (T1) helically wound around a main axis (A), each strand (T1) being a strand with at least two layers (C1, C3), with the strands (T1) being helically wound around an axis (B); and - an outer layer (CE) of the cable, made up of Y > 1 multi-strands (M2) wound around the inner layer (CI) of the cable, each multi-strand (M2) comprising L > 1 strands (T2) helically wound around a main axis (A'), each strand (T2) being a strand with at least two layers (C1'; C3'), with the multi-strands (T2) being helically wound around the main axis (A). The cable (50) has a structural elongation As such that As ≥ 1.0%.