Motorcycle Tyre Tread Structure for Wet Grip and Hot-Road Durability
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Solution Overview
Problem
High-performance motorcycle tires face challenges in balancing handling and road holding on both dry, hot surfaces and wet, cold conditions, with existing solutions often compromising one set of requirements for another, and traditional high-silica compounds failing to provide adequate grip and durability on dry, hot roads.
Innovation Solution
A 'cap-and-base' tread band structure with radially inner and outer portions made from vulcanized elastomeric materials containing high amounts of white fillers, such as silica and silicates, optimized with specific dynamic mechanical properties to enhance grip and durability across varying conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If carbon black filler is used in tread rubber compound for high-performance tyres in dry conditions and high temperatures, then grip and durability on dry, hot roads is improved, but handling and road holding in wet and cold conditions deteriorates
Solution Approach 1:
The tread band is divided into different zones with different rubber compounds: the central crown portion uses a compound optimized for wet and cold conditions with higher silica content and lower carbon black, while the shoulder portions use a compound optimized for dry conditions with higher carbon black content. This local differentiation allows each zone to perform optimally in its specific operating conditions.
Solution Approach 2:
The tyre uses composite rubber compounds combining silica and carbon black fillers in different proportions across different tread zones. The crown portion uses a composite with higher silica content for wet/cold performance, while shoulder portions use composites with higher carbon black for dry grip, creating a multi-composite structure that addresses multiple conflicting requirements.
2Adaptability or versatility
If white fillers such as silica and silicates are used in tread rubber compound for wet and cold conditions, then handling and road holding in wet and cold conditions is improved, but grip and durability on dry, hot roads deteriorates
Solution Approach 1:
The tread band is divided into different zones with different rubber compounds: the central crown portion uses a compound optimized for wet and cold conditions with higher silica content and lower carbon black, while the shoulder portions use a compound optimized for dry conditions with higher carbon black content. This local differentiation allows each zone to perform optimally in its specific operating conditions.
Solution Approach 2:
The tyre uses composite rubber compounds combining silica and carbon black fillers in different proportions across different tread zones. The crown portion uses a composite with higher silica content for wet/cold performance, while shoulder portions use composites with higher carbon black for dry grip, creating a multi-composite structure that addresses multiple conflicting requirements.
3Ease of operation
If rigid tyre structure is used on track with deflated tyres, then ground-contacting area and readiness to extreme maneuvers is improved, but comfort and ability to absorb stresses on different road surfaces deteriorates
Solution Approach 1:
The tyre structure incorporates dynamic elements including a flexible tread band design with optimized groove patterns that allow the tyre to adapt its rigidity and contact characteristics based on operating conditions. The tread pattern includes grooves that can deform and flex under load, providing both stability during extreme maneuvers and compliance with road surface variations.
Solution Approach 2:
The tyre design optimizes parameters such as groove depth, groove width, and groove spacing to balance rigidity and flexibility. The groove dimensions are specifically engineered to provide structural support during high-performance maneuvers while maintaining enough compliance to absorb vibrations and stresses from varied road surfaces during normal operation.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The tire achieves improved handling and road holding on wet and cold surfaces while maintaining performance on dry, hot surfaces, with controlled deformations and hysteresis reducing heat generation and enhancing overall tire longevity.
Implementation Method 1
controlled deformations and hysteresis reducing heat generation
Data Source
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AI summary
A motorcycle tyre (1) is described comprising an equatorial plane (X-X) and a tread band (8) comprising a radially inner portion (13) and a radially outer portion (11) respectively comprising a first and a second vulcanized elastomeric material obtained by vulcanizing respective elastomeric materials comprising 100 phr of at least one elastomeric diene polymer, from 30 to 130 phr of at least one reinforcing filler comprising an amount greater than 75% or, respectively, equal to or greater than 80% of a white filler. In the tyre (1) the ratio R1 between the dynamic elastic modulus (E') and the tandelta measured at a frequency of 10 Hz and at 70°C of the first vulcanized elastomeric material is comprised between 27 and 35, whereas the ratio R2 between the dynamic elastic modulus (E') and the tandelta measured at a frequency of 10 Hz and at 70°C of the second vulcanized elastomeric material is comprised between 15 and 30, the ratio R1/R2 being greater than or equal to 1.1.