Tire Component Thickness and Rubber Aging for Stable Handling
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Solution Overview
Problem
Long-term maintenance of handling stability is crucial for safety, as tires degrade over time and existing technologies fail to consistently maintain handling stability after degradation.
Innovation Solution
A tire with a rubber composition that has a rate of change in elongation at break (ΔEB) of 8.0% or lower after heat aging, combined with a product (ΔEB × Tt) of less than 30, where Tt is the thickness of the tire component, to maintain handling stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional rubber compositions are used, then initial handling performance is achieved, but handling stability deteriorates after degradation
Solution Approach 1:
The invention changes the chemical composition parameters of the rubber compound by incorporating specific antioxidants (6ppd and 77pd in defined ratios) and sulfur compounds, which fundamentally alters how the rubber degrades thermally. This parameter change ensures that elongation at break remains above 40% after heat aging, directly resolving the contradiction between initial performance and long-term stability.
Solution Approach 2:
The invention uses a composite antioxidant system combining 6ppd and 77pd with specific sulfur compounds, creating a synergistic effect that provides both initial protection and long-term stability. This composite approach allows the rubber to maintain handling stability after degradation while preserving elongation properties, resolving the technical contradiction.
2Strength
If rubber thickness is increased to improve durability, then strength is improved, but handling stability after degradation worsens due to greater cumulative degradation
Solution Approach 1:
By changing the chemical parameters of the rubber compound through specific antioxidant and sulfur compound combinations, the invention enables thinner rubber sections to achieve the same durability as thicker sections. The controlled degradation rate means that even thinner components maintain handling stability, resolving the contradiction between strength and long-term reliability.
3Ease of operation
If rubber composition is optimized for initial performance, then handling performance is improved, but degradation resistance worsens
Solution Approach 1:
The invention applies preliminary protective action by incorporating specific antioxidants (6ppd and 77pd) and sulfur compounds into the rubber compound before the tire is put into service. This preliminary protection prevents degradation from occurring rapidly, allowing the rubber to maintain both handling performance and degradation resistance throughout its service life.
Solution Approach 2:
The invention optimizes the chemical parameters of the rubber compound by defining specific ratios of antioxidants and sulfur compounds, creating a composition that simultaneously delivers excellent initial handling performance and superior degradation resistance, resolving the contradiction between these two requirements.
Data Source
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AI summary
Provided is a tire having excellent handling stability after degradation. The tire includes a tire component that includes a rubber composition, the rubber composition having a rate of change ΔEB in elongation at break between before and after heat aging of 8.0% or lower, the tire having a product (ΔEB × Tt) of the ΔEB (%) and a thickness Tt (mm) of the tire component of less than 30.