Multi-Layer Tire Tread for Wet Grip Across Temperature Range
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Solution Overview
Problem
Existing tire treads fail to provide satisfactory performance on non-wintry surfaces, especially in wet conditions, due to temperature dependency issues, where improvements for wintry surfaces negatively impact wet performance.
Innovation Solution
A tread design featuring a contact face with a principal groove and sub-grooves, covered by a multi-layer structure with specific modulus and glass transition temperature profiles for the outer and inner layers, optimizing edge effect and traction across a wide temperature range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If reinforcing layers with high modulus and glass transition temperature are used to improve edge effect, then wintry surface performance is improved, but performance on non-wintry surfaces at wide temperature range deteriorates
Solution Approach 1:
The multi-layer covering structure enables dynamic adaptation to different temperature conditions. At low temperatures, the first covering layer's high modulus provides edge effect. At higher temperatures, the second covering layer's lower modulus allows flexibility, preventing the hardening and brittleness that would occur with a single high-modulus layer across all temperatures
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 tread design enhances performance on non-wintry surfaces at various temperatures while maintaining or improving performance on wintry surfaces, avoiding the degradation seen in prior technologies.
Implementation Method 1
a material constituting the outer covering layer has a modulus G* at 60°C Mo and a glass transition temperature Tgo, and an inner covering layer facing to inward of the contact element, a material constituting the inner covering layer has a modulus G* at 60°C Mi and a glass transition temperature Tgi
Data Source
Figure 1
Figure 2(a)~2(c)
Figure 3
AI summary
A tread for a tire having a contact face (2) intended to come into contact with ground during rolling, a material constituting a plurality of contact elements having a modulus G* at 60°C Mb and a glass transition temperature Tgb, at least one of a contact element (5) being provided with a covering layer (6) covering at least one of a lateral face (7) of the contact element (5) facing to circumferential orientation at least partly, the covering layer (6) consists of at least two layers (61, 62), an outer covering layer (61) facing to outward of the contact element (5), a material constituting the outer covering layer (61) has a modulus G* at 60°C Mo and a glass transition temperature Tgo, and an inner covering layer (62) facing to inward of the contact element (5), a material constituting the inner covering layer (62) has a modulus G* at 60°C Mi and a glass transition temperature Tgi.