Pneumatic Tire Band Segmentation for Stability and Cornering
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Solution Overview
Problem
Conventional tires for two-wheeled vehicles face challenges in achieving both high-speed stability and cornering performance, with existing designs either compromising on radial holding force or torsional stiffness.
Innovation Solution
A tire design featuring a band with a center portion, intermediate portions, and outer end portions, each formed from specific band members with varying orientations and materials, including steel and aramid fibers, to enhance both stability and cornering capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a band is formed from cords helically wound in the circumferential direction, then stability during high speed running is improved, but cornering performance deteriorates due to poor torsional stiffness
Solution Approach 1:
The band is divided into multiple regions along the axial direction: a center region with cords extending in the circumferential direction for stability, and intermediate regions with cords tilted at angles to improve torsional stiffness and cornering performance. This segmentation allows different regions to fulfill different functional requirements simultaneously.
Solution Approach 2:
Different cord orientations are applied to different regions of the band. The center region uses circumferentially extending cords for high-speed stability, while the intermediate regions use tilted cords for enhanced cornering performance. This local differentiation optimizes performance for specific functional zones.
2Strength
If a band is formed with cords tilted to create a mesh-like shape, then cornering performance is improved, but stability during high speed running deteriorates due to inferior radial holding force
Solution Approach 1:
The band structure is segmented into center and intermediate regions with different cord configurations. The center region maintains circumferential cord extension for radial holding force, while intermediate regions use tilted cords for cornering enhancement, resolving the contradiction between these two performance aspects.
Solution Approach 2:
The band exhibits asymmetric cord orientation patterns, with the center region having cords predominantly in the circumferential direction and intermediate regions having cords tilted at specific angles. This asymmetric design allows optimization for different operational conditions in different zones.
Data Source
AI summary
A band 12 includes a center portion C, a pair of intermediate portions M, and a pair of outer end portions E. The center portion C is formed from a first band member 40 and that extends in a circumferential direction. Each intermediate portion M is formed from a second band member 42 and that extends so as to form a mesh-like shape. The second band member 42 includes a plurality of first tilt portions 44 extending so as to be tilted relative to the circumferential direction and a plurality of second tilt portions 46 extending so as to be tilted relative to the circumferential direction in a direction opposite to a direction in which the first tilt portions 44 are tilted. Each outer end portion E is formed from a third band member 54 and that extends in the circumferential direction.