Variable Pitch Tire Reinforcement for Wear and Grip
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Solution Overview
Problem
Motorcycle tires face challenges in wear and grip performance due to conventional radial carcass reinforcement designs with constant pitch, which affect endurance, stability, and driving comfort.
Innovation Solution
A tire design featuring a radial carcass reinforcement with a crown reinforcement layer of circumferential elements distributed at a variable pitch, where the pitch varies between different parts of the layer, increasing stiffness in certain areas and reducing it in others, optimizing circumferential stiffness and density for improved wear and grip.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional radial carcass reinforcement with constant pitch is used, then manufacturing simplicity is maintained, but wear resistance and grip performance are insufficient
Solution Approach 1:
The patent applies local quality by varying the pitch of circumferential reinforcing elements in different axial regions of the tire. The pitch is smaller in the intermediate parts (higher density) and larger in the axially outer parts (lower density), creating region-specific reinforcement that optimizes wear resistance and grip where needed while reducing material usage in less critical areas.
2Reliability
If constant pitch design is used, then material usage is simplified, but grip performance and stability are compromised
Solution Approach 1:
The invention divides the crown reinforcement into distinct regions (central part, intermediate parts, and axially outer parts) with different pitch values. This local differentiation ensures optimal grip performance in the intermediate regions where higher reinforcing element density provides enhanced stability, while maintaining acceptable performance in other regions.
3Reliability
If higher density of circumferential reinforcing elements is used, then wear resistance improves, but material usage and manufacturing costs increase
Solution Approach 1:
The patent optimizes material usage by applying higher density (smaller pitch) of circumferential reinforcing elements only in the intermediate parts where wear resistance is most critical, while using lower density (larger pitch) in the axially outer parts. This selective reinforcement reduces overall material consumption while maintaining necessary wear resistance in high-stress regions.
Solution Approach 2:
The invention changes the pitch parameter of the circumferential reinforcing elements along the axial direction, creating a gradient distribution. This parameter variation allows optimization of material distribution, concentrating reinforcing elements where they provide maximum benefit for wear resistance while minimizing unnecessary material usage in less critical areas.
Data Source
AI summary
A tire with radial carcass reinforcement comprises a crown reinforcement including a layer of circumferential reinforcing elements distributed axially at a variable pitch. The layer of circumferential reinforcing elements is radially crowned by a tread strip, which is connected to two beads by two sidewalls. The layer of circumferential reinforcing elements comprises five parts, including a central part, two intermediate parts and two axially outer parts. The value of the pitch in the two intermediate parts is less than a value of the pitch in the two axially outer parts. Each axially outer part is axially separated from the central part by a corresponding intermediate part. The value of the pitch in each intermediate part is less than a value of the pitch in the central part, and the value of the pitch in each axially outer part is less than the value of the pitch in the central part.