Composite Tire Cord Structure for Ride Comfort and Durability
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Solution Overview
Problem
The use of polyester fiber cords in tires can impair ride comfort and durability due to their higher modulus and poor compression fatigue resistance compared to nylon fiber cords, increasing the risk of breakage from repeated deformation.
Innovation Solution
A tire cord composed of twisted polyester and nylon fibers, with specified stress and elongation ranges, is used in the tire ply to maintain ride comfort and durability while reducing manufacturing costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If polyester fiber cords are used instead of nylon fiber cords, then manufacturing cost is reduced, but ride comfort is impaired and compression fatigue resistance deteriorates
Solution Approach 1:
The patent applies composite materials by combining polyester fiber and nylon fiber in a single cord structure. The cord contains both polyester filaments and nylon filaments twisted together, creating a composite fiber cord that leverages the cost advantage of polyester while incorporating the superior mechanical properties of nylon to maintain ride comfort and compression fatigue resistance
Solution Approach 2:
The patent specifies precise parameter ranges for the composite cord: stress at 2.5% elongation of 0.05 to 0.18 N/tex and stress at 5.0% elongation of 0.09 to 0.33 N/tex. By controlling these mechanical parameters within defined ranges, the invention optimizes the balance between cost reduction and performance maintenance
2Ease of manufacture
If polyester fiber cords are used, then manufacturing cost is reduced, but strength decreases due to repeated deformation resulting in breakage
Solution Approach 1:
The composite cord structure combines polyester and nylon fibers, where nylon provides enhanced strength and resistance to compression fatigue. This composite approach allows the cord to withstand repeated deformation without breakage while maintaining the cost benefits of polyester
Solution Approach 2:
The patent defines specific stress and elongation parameter ranges that ensure the cord maintains sufficient strength under repeated deformation conditions. The stress at 2.5% elongation (0.05 to 0.18 N/tex) and stress at 5.0% elongation (0.09 to 0.33 N/tex) are controlled to prevent breakage while reducing cost
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 specified tire cord configuration allows for equivalent ride comfort and durability to nylon fiber cords while reducing manufacturing costs, by optimizing elongation and stress within the 2.5% to 5.0% range.
Implementation Method 1
the cord includes a first filament made of a polyester fiber and a second filament made of a nylon fiber which are twisted together
Data Source
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AI summary
The present invention provides a tire cord and a tire capable of reducing a manufacturing cost of a tire while maintaining ride comfort and durability. The tire cord 11 is used for a ply 10 of a tire 1. The cord contains polyester fibers and has a stress σ1 at 2.5% elongation of 0.05 to 0.18 N/tex and a stress σ2 at 5.0% elongation of 0.09 to 0.33 N/tex.