Motorcycle Tire Shoulder Reinforcing Segments for Stability
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Solution Overview
Problem
Motorcycle tires face challenges in achieving improved high-speed stability and cornering performance as they need to balance binding force and rigidity changes between the crown and shoulder reinforcing parts to enhance transient characteristics during cornering.
Innovation Solution
The tire design incorporates inner circumferentially extending segments that enhance binding force near the crown region and reduce rigidity changes at the boundary with the shoulder reinforcing parts, with specific length ratios and angles to improve high-speed stability and cornering performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the tread reinforcing layer has a mesh-like cord structure in the shoulder portions, then the torsional rigidity of the shoulder portions is enhanced and cornering performance is improved, but the binding force to the crown region is reduced and high-speed stability performance deteriorates
Solution Approach 1:
The tread reinforcing layer is divided into distinct functional segments: a center portion with spiral cord structure for high-speed stability, and shoulder portions with mesh-like cord structure for cornering performance. The inner circumferentially extending segments act as connecting elements between these segments, creating a segmented but integrated structure that resolves the contradiction between binding force and cornering performance.
Solution Approach 2:
Different regions of the tread reinforcing layer are given different cord structures and orientations to optimize local performance. The center portion uses spiral cords for stability, while shoulder portions use mesh-like cords for cornering. The inner circumferentially extending segments provide localized reinforcement at the boundary between crown and shoulder regions, creating local quality variations that resolve the force distribution contradiction.
2Stability of the object's composition
If the rigidity at the boundary between crown reinforcing part and shoulder reinforcing part changes significantly, then the mesh-like cord structure provides enhanced torsional rigidity, but the transient characteristics during cornering deteriorate
Solution Approach 1:
The cord orientation angle is used as a variable parameter that changes continuously from the crown region to the shoulder regions. The inner circumferentially extending segments have cords oriented at angles between 0-5 degrees relative to the circumferential direction, creating a gradual transition in rigidity parameters. This parameter change approach smooths the boundary between high-rigidity and low-rigidity zones, improving transient cornering characteristics while maintaining overall torsional rigidity.
Data Source
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AI summary
A motorcycle tire (1) is provided with a pair of shoulder reinforcing parts (7S). The shoulder reinforcing part (7S) comprises a plurality of inclining segments (13) in which a rubber-coated cord strip (9) is inclined, and a plurality of circumferentially extending portions (14) in which a rubber-coated cord strip (9) is substantially parallel with the tire circumferential direction. The inclining portions (13) has a mesh structure having rhombic spaces (17) surrounded by first inclining segments (15) and second inclining segments (16). Circumferentially extending portions 14 include inner circumferentially extending segments (18) extending in the tire circumferential direction and connected to axially inner ends of the first inclining segments (15) and second inclining segments (16). The circumferential length of the inner circumferentially extending segments (18) is 50% to 150% of the maximum circumferential length of the spaces (17).