Aircraft Tire Tread Wear Resistance via Diene Elastomer

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Solution Overview

Problem

Aircraft tires face challenges in wear resistance and endurance due to extreme conditions during landing, where existing rubber compositions based on natural rubber and carbon black do not adequately address the high stress, temperature variations, and speed changes, leading to premature degradation.

Innovation Solution

Aircraft tires with treads composed of a rubber composition based on a diene elastomer containing ethylene and diene units with carbon-carbon double bonds, statistically distributed, along with a reinforcing filler and crosslinking system, enhance wear resistance and endurance by improving the mechanical properties to withstand cyclic stresses and high-speed conditions.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If conventional rubber compositions based on natural rubber and carbon black are used, then the tire can withstand basic high pressure and load conditions, but the wear resistance and endurance under extreme landing conditions are insufficient

Engineering Contradiction:

Improvewear resistanceVSAvoiddegradation under extreme conditions

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The patent changes the chemical composition parameters of the rubber by using a specific diene elastomer with at least 50 mol% ethylene units and 10-50 mol% diene units, replacing conventional natural rubber compositions. This parameter change in polymer structure provides superior wear resistance and endurance under extreme landing conditions while maintaining compatibility with existing carbon black reinforcement and crosslinking systems.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent creates a composite rubber composition by combining the diene elastomer with carbon black reinforcing filler and crosslinking agents. This composite approach leverages the enhanced base polymer properties combined with the reinforcing effects of carbon black and crosslinking to achieve superior overall performance in wear resistance and endurance under high stress, temperature variations, and speed changes.

Inventive Principle:

Principle #40Composite materials

2Strength

If the tire is designed to withstand high speed and temperature variations during landing, then the mechanical strength is improved, but the wear resistance under cyclic stresses deteriorates

Engineering Contradiction:

Improvemechanical strengthVSAvoidendurance

Core Design Contradiction:

StrengthVSDuration of action of moving object

Solution Approach 1:

The patent modifies the polymer structure parameters by incorporating a diene elastomer with specific ethylene (≥50 mol%) and diene (10-50 mol%) unit compositions. This structural parameter change provides a balanced material that maintains mechanical strength under high speed and temperature variations while simultaneously improving endurance resistance to cyclic stresses during repeated landing cycles.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent ensures continuous performance throughout the tire's service life by designing a rubber composition that maintains consistent mechanical properties and wear resistance across multiple service lives. The diene elastomer-based composition with carbon black reinforcement provides sustained performance under cyclic loading conditions, enabling the tire to withstand repeated landing stresses without degradation of either strength or endurance characteristics.

Inventive Principle:

Principle #20Continuity of useful action

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 tire composition significantly improves wear resistance and endurance, doubling the mass loss performance in high-speed abrasion tests, effectively extending the tire's service life and resistance to extreme landing conditions compared to conventional compositions.

Implementation Method 1

a first diene elastomer which comprises ethylene units and diene units comprising a carbon-carbon double bond

Methodology Applied

Scientific EffectElasticity: Elasticity

Implementation Method 2

a crosslinking system

Methodology Applied

Scientific EffectChemical Bonding: Chemical Bonding

Implementation Method 3

a reinforcing filler

Methodology Applied

Scientific EffectParticle Reinforcement:

Data Source

PatentEP3172061B1Tire for airplane

Publication Date: 2020.02.12 MICHELIN & CO (CIE GEN DES ESTAB MICHELIN)

AI summary

The present invention relates to an aircraft tyre, the tread of which comprises a rubber composition based on at least one first diene elastomer, a reinforcing filler and a crosslinking system, which first diene elastomer comprises ethylene units and diene units comprising a carbon-carbon double bond, which units are distributed statistically within the first diene elastomer, the ethylene units representing at least 50 mol% of all of the monomer units of the first diene elastomer. Such a tyre has a greatly improved landing performance, especially with respect to the wear resistance at very high speed.