Motorcycle Tire Tread Structure for Braking and Cornering Stability
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Solution Overview
Problem
Existing motorcycle tires face challenges in achieving improved stability during braking and cornering performance, particularly as motorcycle performance has advanced.
Innovation Solution
The motorcycle tire design includes a tread reinforcing layer with a belt layer inclined to the tire circumferential direction, a band layer helically wound in the tire circumferential direction, and differentiated rubber hardness and stiffness between the crown and shoulder rubbers to enhance stability and cornering performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a tread reinforcing layer with belt layer and band layer is added, then cornering performance and braking stability are improved, but device complexity and manufacturing difficulty increase
Solution Approach 1:
The tread reinforcing layer is divided into two distinct layers: a belt layer with inclined belt cords and a band layer with helically wound band cords. This segmentation allows each layer to perform specific functions - the belt layer provides lateral stability for cornering while the band layer provides longitudinal stability for braking, resolving the contradiction by achieving improved reliability through structured complexity rather than unmanaged complexity
Solution Approach 2:
The patent combines different cord arrangements (inclined belt cords and helically wound band cords) within the tread reinforcing layer to create a composite structure. This composite approach allows the tire to simultaneously achieve cornering performance through the belt layer and braking stability through the band layer, resolving the technical contradiction by integrating multiple functional elements into a unified structure
2Reliability
If shoulder rubbers with higher stiffness are used, then braking stability is improved, but comfort and ride quality may deteriorate
Solution Approach 1:
The patent applies different rubber compound properties to different regions of the tread - the shoulder rubbers have higher stiffness (higher hardness, complex elastic modulus, and 300% modulus at elevated temperatures) compared to the crown rubber. This local quality differentiation allows the shoulder regions to provide enhanced braking stability while the crown region maintains comfort characteristics, resolving the contradiction by optimizing each region's properties for its specific function
3Manufacturing precision
If the band layer development width is reduced, then manufacturing precision is improved, but structural strength may be compromised
Solution Approach 1:
The patent creates a composite reinforcing structure where the band layer with helically wound band cords works in conjunction with the belt layer containing inclined belt cords. The band layer's primary function is to provide longitudinal stability during braking, while the belt layer provides lateral stability during cornering. This composite approach allows the band layer to be optimized for manufacturing precision without compromising overall structural strength, as the belt layer compensates for the reduced band layer width
Data Source
AI summary
A motorcycle tire can include a tread portion, sidewall portions, bead portions, and a carcass. The tread portion can include a tread reinforcing layer and a tread rubber. The tread reinforcing layer can include a belt layer and a band layer. A development width of the band layer can be smaller than that of the belt layer. The tread rubber can include a crown rubber and shoulder rubbers. A hardness at 100° C. of each shoulder rubber can be higher than a hardness at 100° C. of the crown rubber, a complex elastic modulus at 100° C. of each shoulder rubber can be higher than a complex elastic modulus at 100° C. of the crown rubber, and a 300% modulus at 100° C. of each shoulder rubber can be higher than a 300% modulus at 100° C. of the crown rubber.