Pneumatic Tire Tread Groove Segmentation for Wet Grip
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Solution Overview
Problem
Racing tires with tread patterns featuring main grooves in the circumferential direction suffer from hydroplaning and water retention issues on wet roads, leading to inadequate braking and cornering performance due to insufficient tread rigidity.
Innovation Solution
A pneumatic tire design with a center main groove and subsidiary grooves in the circumferential direction, accompanied by angled and lateral grooves that direct water laterally, and sub grooves that close on the leading side to enhance drainage and maintain block rigidity, optimizing the block edge length and groove dimensions for improved hydroplaning prevention and performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If main grooves extending in the tire circumferential direction are provided as the main constituent, then drainage capability on wet road surfaces is improved, but water pushback increases causing hydroplaning phenomenon
Solution Approach 1:
The tread pattern is segmented into multiple functional zones: center main groove for primary drainage, subsidiary main grooves for secondary drainage paths, angled grooves for lateral water redirection, and sub-grooves for fine water evacuation. This segmentation allows water to be drained through multiple pathways simultaneously, reducing water pushback while maintaining drainage capability.
Solution Approach 2:
The patent introduces angled grooves that extend in a direction opposite to the rotational direction, creating a lateral drainage dimension perpendicular to the traditional circumferential drainage path. This dimensional change enables water to be redirected sideways rather than pushed forward, effectively preventing hydroplaning while maintaining drainage efficiency.
2Ease of manufacture
If the tread portion is partitioned into a plurality of blocks by main groove and angled grooves, then water drainage is improved, but rigidity of the tread portion deteriorates
Solution Approach 1:
Different regions of the tread are assigned different groove densities and patterns: the center area has circumferential main grooves for drainage, while the lateral areas have angled and sub-grooves. The block edge length ratio is optimized locally in the center area (40-60% of total block edge length) to balance drainage and rigidity requirements in different zones.
Solution Approach 2:
The tread structure combines multiple groove types (center main groove, subsidiary main grooves, angled grooves, and sub-grooves) within a unified rubber matrix. This composite groove structure provides both drainage functionality and structural integrity, as the interconnected groove system distributes stress while maintaining water evacuation paths.
3Ease of manufacture
If blocks are partitioned by main groove and angled grooves, then drainage performance is improved, but braking and cornering performance on wet road surfaces deteriorates
Solution Approach 1:
The tread pattern is designed to dynamically adapt to different operating conditions: during straight-line wet driving, the center main groove and subsidiary grooves provide primary drainage; during cornering or braking, the angled grooves and sub-grooves activate to provide lateral water evacuation paths. This dynamic functionality ensures reliable performance across various driving scenarios.
Solution Approach 2:
The groove system performs multiple functions simultaneously: center main grooves handle primary circumferential drainage, angled grooves provide lateral water redirection, and sub-grooves offer secondary drainage paths. This multi-functional design ensures that at least some drainage paths remain effective regardless of the direction of water pressure or vehicle maneuver, maintaining braking and cornering performance.
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 effectively reduces water pushback and prevents hydroplaning, ensuring superior braking and cornering performance on wet roads by enhancing drainage and maintaining sufficient tread rigidity, while maintaining contact pressure for improved running performance.
Implementation Method 1
water cannot be drained by the main grooves in tires having a tread pattern with main grooves extending in the tire circumferential direction as a main constituent, which results in an occurrence of a hydroplaning phenomenon
Data Source
AI summary
A pneumatic tire having a designated rotational direction is disclosed, wherein an entire area having a width 85% of a total tire width and a center area having a width 30% of the total tire width are defined in a tread portion. A center main groove is positioned on a tire equatorial line and extends in a tire circumferential direction. Subsidiary main grooves are positioned on two sides of the center main groove and extend in the tire circumferential direction. Angled and lateral grooves extend at an angle, in a direction opposite the rotational direction towards an outside in the tire width direction. Lateral grooves extend from each subsidiary main groove. Sub grooves extend from the lateral grooves towards the rotational direction. A total length of a block edge in the center area is from 40% to 60% of a total length of a block edge in the entire area.