Multi-Layer Tire Tread Managing Wear and Temperature
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Solution Overview
Problem
Heavy-duty tires face issues with increased temperature and wear due to shear stresses and hysteresis losses, leading to premature degradation and reduced endurance, especially in high-speed applications, which complicates retreading and optimizes tread material usage.
Innovation Solution
A tire design featuring a tread with three radially superposed elastomeric compounds, where the outer layer has high stiffness for wear resistance, the middle layer has lower hysteresis to manage temperature, and the inner layer reduces rolling resistance and cohesion, allowing for extended distance before retreading and optimized regrooving.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the tread is made of high-stiffness elastomeric compound for wear resistance, then wear resistance is improved, but temperature increase due to hysteresis losses worsens
Solution Approach 1:
The tread is segmented into multiple radially superposed layers, each with different elastomeric compounds having distinct tan(δ) characteristics. The outer layer uses high-stiffness compound for wear resistance while inner layers use lower-hysteresis compounds to manage temperature, thereby resolving the contradiction between wear resistance and temperature control through functional segmentation.
Solution Approach 2:
Different regions of the tread (radial layers) are assigned different material properties tailored to local requirements. The outer layer positioned at the wear interface has high stiffness for abrasion resistance, while inner layers have optimized hysteresis properties for temperature management, applying local quality differentiation to simultaneously achieve both wear resistance and temperature control.
2Strength
If the tread material has high hysteresis for wear resistance, then wear resistance is improved, but rolling resistance increases
Solution Approach 1:
The tread structure is segmented into multiple layers with differentiated hysteresis properties. The outer layer maintains higher tan(δ) for wear resistance while inner layers use compounds with lower tan(δ) to reduce hysteresis losses and rolling resistance, thereby resolving the energy loss contradiction through layered segmentation.
Solution Approach 2:
The hysteresis parameter (tan(δ)) is changed radially across different tread layers. By varying this parameter from the outer layer to inner layers, the patent optimizes the balance between wear resistance (requiring higher tan(δ)) and rolling resistance (benefiting from lower tan(δ)), allowing both requirements to be satisfied simultaneously through parameter differentiation.
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 a compromise between wear resistance and temperature management, extending the distance before retreading and improving rolling resistance, while maintaining satisfactory performance and enabling regrooving opportunities.
Implementation Method 1
the said second elastomeric compound having a maximum value of tan(δ), denoted tan(δ)max, at least 10% lower than that of the first elastomeric compound
Data Source
AI summary
A tire the tread of which contains at least three circumferential grooves, having at least three radially superposed layers of elastomeric compounds.A first elastomeric compound constituting the first layer forming the radially outer part of the tread has a maximum value of tan(δ)max, greater than 0.110, a second elastomeric compound constituting the second layer radially on the inside has a tan(δ)max at least 10% lower than the first elastomeric compound, the radially innermost third layer of the tread consists of at least two first parts and of at least three second parts axially, each one in contact with at least one of the at least two first parts, the at least two first parts axially centered on a radial plane passing through one of the at least three circumferential grooves consisting of the second compound and the at least three second parts consisting of a third elastomeric compound having a maximum value of tan(δ), denoted tan(δ)max, at least 10% lower than the second elastomeric compound.