Studded Tyre Groove Layout for Wet Grip and Dry Handling
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Solution Overview
Problem
Existing studded tires struggle to balance grip and handling properties on various road conditions, including ice, snow, water, and slush, due to inadequate land ratios and sipe densities, which can lead to reduced traction and stability.
Innovation Solution
The tire design features a specific land ratio distribution with a higher central land ratio and sipe density in the central region compared to the shoulder regions, combined with optimized groove and sipe configurations, to enhance drainage and grip on wet and snowy surfaces while maintaining handling on dry roads.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If large grooves are used to drive away water and slush, then grip on wet roads is improved, but handling on bare roads deteriorates due to reduced tread block stability
Solution Approach 1:
The patent applies different land ratio values to different regions of the tread: the central region has a first land ratio while the shoulder region has a second land ratio. This local differentiation allows the central region to provide stable handling on bare roads while the shoulder region optimizes water drainage capability, resolving the contradiction between grip on wet roads and handling on bare roads.
2Productivity
If too many grooves and large grooves are used, then water drainage is improved, but tread block stability is reduced leading to worsened handling
Solution Approach 1:
The patent implements local quality by assigning different land ratio characteristics to different tread regions. The central region's land ratio is optimized for maintaining tread block stability and handling, while the shoulder region's land ratio is optimized for water drainage efficiency, thus resolving the contradiction between drainage productivity and structural stability.
3Reliability
If softer material and more sipes are used, then grip on snow and ice is improved, but handling deteriorates
Solution Approach 1:
The patent applies local quality by differentiating sipe density between central and shoulder regions. The central region has a first sipe density while the shoulder region has a second sipe density. This allows the central region to provide enhanced grip on snow and ice through increased siping, while the shoulder region maintains adequate handling characteristics, resolving the contradiction between winter grip and handling.
Data Source
Figure 1a~1f
Figure 1g~2b
Figure 2c~2e
AI summary
A tyre (200) comprising a tread (210) comprising tread blocks (220) such that grooves (230) are arranged between the tread blocks (220) and studs (100, 100a, 100b) installed into at least some of the tread blocks (220). The tread blocks (220) define a land portion of the tread (210) an envelope surface consisting of the land portion of the tread (210) and a sea portion. An average land ratio of the tyre (200), the average land ratio being defined as a ratio (A220/A210) of the total land area (A220) to total envelope area (A210), is 55 % to 78 %.