Tire Cable Pitch Optimization for Stiffness and Elongation
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Solution Overview
Problem
Tires face challenges in achieving optimal stiffness and structural elongation without increasing weight, as conventional cable constructions either lead to improper positioning during molding or compromise stress resistance, and existing solutions either add weight or fail to maintain proper tire shape under inflation.
Innovation Solution
A cable constructed with strands twisted at a pitch range of 5 mm to 7 mm and filaments at a strand pitch range of 2.9 mm to 5.9 mm, with a pitch ratio of 1.2 to 1.7, providing the necessary stiffness and structural elongation while maintaining a lightweight design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If cable diameter is increased to increase stiffness, then stiffness is improved, but weight increases
Solution Approach 1:
The patent applies parameter changes by optimizing the cable pitch (5-7 mm) and pitch ratio (1.2-1.7) to achieve the desired stiffness without increasing cable diameter. This allows the tire to maintain proper shape during inflation and molding while avoiding additional weight that would result from using thicker cables.
Solution Approach 2:
The patent uses composite construction with multiple strands twisted together at specific pitches, combining steel filaments in a configured arrangement. This composite structure provides the necessary stiffness and strength while maintaining a lightweight design compared to solid thicker cables.
2Stability of the object's composition
If cable stiffness is increased to maintain tire shape, then shape stability is improved, but molding precision deteriorates due to resistance to pressing
Solution Approach 1:
The patent optimizes the cable pitch (5-7 mm) and pitch ratio (1.2-1.7) to achieve a balance where the cable provides sufficient stiffness to maintain tire shape during inflation, while remaining flexible enough to allow proper positioning and pressing during the molding process.
Solution Approach 2:
The twisted strand structure allows the cable to dynamically adjust its flexibility based on applied forces - it can be pressed and positioned during molding, then maintains its shape-stabilizing stiffness during inflation and operation.
3Strength
If cable pitch is decreased to increase stiffness, then stiffness is improved, but structural elongation decreases
Solution Approach 1:
The patent identifies an optimal range for cable pitch (5-7 mm) and pitch ratio (1.2-1.7) that balances stiffness and structural elongation. This parameter optimization ensures the cable provides sufficient stiffness for tire shape maintenance while achieving at least 3% structural elongation for proper positioning during molding.
Data Source
AI summary
A cable as may be used in a tire, including a pneumatic tire. The cable is constructed in a manner that can provide a desired stiffness to a tire as well as a certain amount of structural elongation. The cable can be provided in a manner that does not necessarily result in an increase in the overall weight of the tire as would occur by e.g., increasing the diameter of a conventional cable construction.