Multi-Strand Tire Cable Structure for Elastomer Penetration
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Solution Overview
Problem
Existing multi-strand cables used in heavy industrial vehicle tires are susceptible to corrosion due to the entry and propagation of corrosive agents, and increasing cord diameter or number to enhance breaking force compromises flexibility and penetrability.
Innovation Solution
A two-layer multi-strand cable design with a desaturated outer layer and specific pitch ratios (0.36 ≤ (p3-p2)/p3 ≤ 0.57) to allow elastomer composition penetration, enhancing penetrability while maintaining breaking force.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the cord diameter is increased to enhance breaking force, then the breaking force is improved, but the flexibility and penetrability of the cord deteriorate
Solution Approach 1:
The cable is divided into multiple strands (at least three strands) wound around a central element, with each strand containing multiple cords. This segmentation allows the cable to maintain high breaking force through multiple load-bearing elements while improving flexibility and penetrability through the distributed, finer structure of individual strands and cords.
2Strength
If the number of cords is increased to enhance breaking force, then the breaking force is improved, but the penetrability of the strands by elastomer composition deteriorates
Solution Approach 1:
The cable structure implements local quality by having strands with different characteristics: some strands have tighter cord packing for strength, while the overall strand arrangement and helical winding create localized spaces that allow elastomer penetration. The core element and helical geometry create channels for elastomer flow without compromising the breaking force of individual cord assemblies.
3Strength
If the unit strength of each cord is increased to enhance breaking force, then the breaking force is improved, but the investment in cord manufacturing facilities increases significantly
Solution Approach 1:
Instead of using fewer high-strength cords requiring specialized manufacturing, the invention segments the load-bearing function across multiple cords within strands, and multiple strands within the cable. This allows use of standard cord manufacturing processes while achieving high breaking force through the cumulative strength of many cords working together in parallel.
Data Source
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AI summary
The cable (50) comprises: -K>1 inner strands (TI) comprising: an inner layer (C1) of Q=1 inner wire (F1), an intermediate layer (C2) of M intermediate wires (F2) wound around the inner layer (C1) with a pitch p2, an outer layer (C3) of N outer wires (F3) wound around the intermediate layer (C2) with a pitch p3, -L>1 outer strands (TE) comprising: an inner layer (C1'), an outer layer (C3'), the average inter-strand distance E separating two adjacent outer strands being greater than or equal to 30 µm; the intermediate layer (C2) of each inner strand (TI) is incomplete; the outer layer (C3) of each inner strand (TI) is incomplete; and 0.36≤(p3-p2)/p3≤0.57.