Aircraft Tyre Tread Ozone Resistance via Radial Composition
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Solution Overview
Problem
Aircraft tires face significant challenges with ozone resistance, particularly in the radially outer portions of the tread, which can lead to glazing and cracking, and existing anti-ozone waxes may not be sufficient under high exposure conditions without compromising other essential properties like wear resistance and thermal stability.
Innovation Solution
A tire tread composition with a radially outer portion and a radially inner portion, where the radially inner portion includes a specific elastomeric matrix containing diene elastomer, a salt of an alkali, alkaline earth, or lanthanide metal, and a crosslinking system, while the radially outer portion has a different composition without the salt, enhancing ozone resistance without compromising other mechanical properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If anti-ozone waxes are used to protect the tread, then ozone resistance is improved, but wear resistance and thermal stability may be compromised
Solution Approach 1:
The patent applies different compositions to different radial portions of the tread. The radially outer portion (exposed to ozone) contains anti-ozone waxes and salts for ozone protection, while the radially inner portion maintains natural rubber composition for optimal wear resistance and thermal stability. This local differentiation resolves the contradiction by providing ozone resistance only where needed without compromising overall tire performance.
Solution Approach 2:
The patent creates a composite tread structure with two distinct rubber compositions. The first composition (radially outer) combines natural rubber with anti-ozone waxes and salts, while the second composition (radially inner) uses pure natural rubber. This composite approach allows the tire to simultaneously achieve ozone resistance at the surface and maintain mechanical properties in the bulk material.
2Reliability
If the entire tread is made of natural rubber for optimal wear resistance and thermal stability, then mechanical properties are improved, but ozone resistance deteriorates
Solution Approach 1:
The patent modifies only the radially outer portion of the tread that is exposed to ozone, while keeping the radially inner portion as pure natural rubber. This localized modification ensures that the bulk of the tread maintains optimal mechanical properties for wear and heat resistance, while only the necessary surface layer receives ozone protection additives.
Solution Approach 2:
The tread is segmented into two distinct radial zones with different compositions. The segmentation allows each zone to be optimized for its specific function: the outer zone for ozone protection and the inner zone for mechanical performance. This resolves the contradiction by separating the protective function from the structural function.
3Object-affected harmful factors
If anti-ozone waxes are applied to the tread surface, then ozone resistance is improved, but the composition becomes more complex
Solution Approach 1:
The patent merges the anti-ozone protection function with the tread rubber matrix by incorporating salts and waxes directly into the rubber composition during manufacturing. This integration eliminates the need for separate surface applications or coatings, simplifying the overall structure while maintaining effective ozone protection. The protective agents become part of the tread material itself rather than external additives.
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 proposed composition significantly improves ozone resistance while maintaining the necessary mechanical properties for aircraft tires, reducing cracking and ensuring optimal wear resistance and thermal stability.
Implementation Method 1
the radially inner portion (22) consisting of a composition based on: an elastomeric matrix comprising at least diene elastomer, from 0.2 to 10 phr of at least one salt of an alkali, alkaline earth or lanthanide metal
Data Source
Figure 1~2
AI summary
The invention relates to a tyre (1) having improved ozone resistance, said tyre being provided with a tread (2) having circumferential grooves (4) having a depth P, and comprising a radially outer portion having a thickness EE and a radially inner portion having a thickness EI <sb />, the radially inner portion consisting of a composition based on an elastomeric matrix comprising at least one diene elastomer, 0.2 to 10 phr of at least one salt of an alkali, alkaline-earth or lanthanide metal, at least one reinforcing filler, and a crosslinking system.