All-Season SUV Tire Tread with Localized Void Ratios
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Solution Overview
Problem
All-season tires for SUVs and Crossovers face the challenge of balancing performance in various road and weather conditions while minimizing wear, as they require a high number of grooves and sipes for winter traction but this leads to uneven contact pressure and wear patterns, conflicting with the need for a low void-to-rubber ratio for durability and drainage.
Innovation Solution
A tire design with a tread band featuring a central region with a low void-to-rubber ratio adjacent to medium or high void-to-rubber ratio areas, including three rows of blocks with transverse grooves and a plurality of sipes, which helps in uniform contact pressure distribution and improved traction without compromising drainage or handling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a high number of grooves and sipes are provided in the tread band to improve winter traction and snow capture, then traction on snow-covered surfaces is improved, but the void-to-rubber ratio increases leading to uneven contact pressure distribution and irregular wear
Solution Approach 1:
The tread band is divided into different zones with distinct characteristics: a central region with lower void-to-rubber ratio for even wear distribution, and shoulder regions with higher void-to-rubber ratio for enhanced snow traction. This local differentiation allows each zone to perform its specific function optimally without compromising the other.
Solution Approach 2:
The tread band is segmented into multiple circumferential ribs with varying groove and sipe configurations. The central ribs have fewer grooves and sipes compared to the shoulder ribs, creating a segmented structure that balances wear characteristics with traction performance across different regions of the tread.
2Duration of action of stationary object
If substantially slick circumferential ribs are provided in the central portion of the tread band to reduce void-to-rubber ratio and improve wear uniformity, then tyre life is extended, but contact pressure distribution in the footprint area becomes imperfect triggering early and irregular wear
Solution Approach 1:
The central ribs are designed with moderate grooving and siping rather than being completely slick, providing local quality that balances wear uniformity with adequate contact pressure distribution. This localized optimization prevents both excessive wear and poor pressure distribution.
Solution Approach 2:
The void-to-rubber ratio is carefully controlled within specific ranges (20-40% for central ribs, 40-60% for shoulder ribs) rather than using extreme values. This parameter optimization ensures both acceptable wear characteristics and sufficient contact pressure distribution.
3Reliability
If wide tyres with larger fitting diameters are used for SUVs and Crossovers to improve sporty look and high-speed cornering safety, then driving safety on dry surfaces is increased, but moving mass increases resulting in more critical tyre wear control
Solution Approach 1:
Different regions of the wide tread band are designed with different groove and sipe densities tailored to their specific functions. The central region uses a conservative approach for wear control, while the wider shoulder regions utilize higher void ratios for enhanced traction, optimizing performance across the entire wide footprint.
Solution Approach 2:
The wide tread band is divided into multiple circumferential ribs that can independently manage contact pressure and wear. This segmentation allows the wide tyre to maintain sporty characteristics and high-speed stability while controlling overall wear through distributed contact patterns.
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 design enhances mileage, traction, and braking performance on snow-covered surfaces while maintaining uniform wear and good drainage, addressing the conflicting requirements of all-season tire performance.
Implementation Method 1
increases the tyre grip on this type of surface, because small amounts of snow are captured into the sipes and friction is increased by the contact of snow against snow
Data Source
AI summary
All season tyre (1) for SUVs and Crossovers; the tyre having a tread band (7) provided with a plurality of sipes (21,22,23,24,25,26) regularly and homogeneously arranged, and a wide central region (LI) provided with three rows of blocks, at least wo of which are provided with transverse grooves only slightly inclined relative to a direction orthogonal to the equatorial plane. The central region (LI) lacks circumferential annular portions having a low void-to-rubber ratio located adjacent to central annular portions having a medium or high void-to-rubber ratio.