Motorcycle Tire Cord Angle Layout for High-Speed Turn Stability
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current motorcycle tires face challenges in maintaining steering stability, especially during high-speed turns, where existing designs do not adequately address the need for improved stability and comfort.
Innovation Solution
The design incorporates a toroidal carcass with specific carcass and belt cord angles and configurations, including a jointless band ply and belt layer with intersecting cords, to enhance steering stability and hoop effect, while maintaining comfort during high-speed turns.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional belt layer designs are used, then manufacturing is simpler, but steering stability during high-speed turns deteriorates
Solution Approach 1:
The belt layer is segmented into multiple belt plies with different cord arrangements. Specifically, the patent uses a first belt ply with belt cords extending in a first direction and a second belt ply with belt cords extending in a second direction different from the first direction. This segmentation allows each ply to contribute differently to steering stability, with the angular difference between plies optimized for high-speed turning performance.
Solution Approach 2:
Different regions of the belt layer are given different local qualities through varying cord angles and ply configurations. The first and second belt plies have different cord extension directions, creating localized variations in mechanical properties that enhance steering stability in critical turning regions while maintaining overall structural integrity.
2Reliability
If higher steering stability is achieved through complex cord arrangements, then high-speed turning performance improves, but manufacturing complexity increases
Solution Approach 1:
The patent optimizes specific parameters of the belt layer construction, including the angular difference between the first and second belt plies, and the orientation of belt cords within each ply. By carefully selecting these parameters (cord angles, ply angles), the design achieves enhanced high-speed turning stability while keeping the manufacturing process within practical limits.
3Reliability
If the band layer uses traditional wound structures, then manufacturing is easier, but high-speed stability deteriorates
Solution Approach 1:
The band layer is designed with a dynamic structure where band cords are wound in multiple directions to adapt to different operational conditions. The patent specifies that band cords extend in first and second directions, creating a flexible yet stable structure that responds dynamically to high-speed turning forces while maintaining structural coherence.
Data Source
AI summary
A motorcycle tire includes a tread portion, a pair of sidewall portions, a pair of bead portions, a toroidal carcass extending between the pair of bead portions, and a belt layer and a band layer disposed outwardly in the tire radial direction of the carcass in the tread portion. The carcass includes a plurality of carcass cords. The band layer includes a jointless band ply having a band cord wound spirally at an angle equal to or less than 5 degrees with respect to a tire circumferential direction. The belt layer includes a plurality of belt cords arranged in a direction intersecting with the carcass cords. The belt cords intersect with the carcass cords at an intersection angle θc in a tread crown region, and intersect with the carcass cords at an intersection angle θs in tread shoulder regions, and the intersection angle θc is greater than the intersection angle θs.