Pneumatic Tire Groove Inclination and Width for Hydroplaning
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Solution Overview
Problem
Existing tire designs that enhance anti-hydroplaning performance often compromise noise performance and steering stability, as increased groove width and depth degrade these aspects on dry road surfaces.
Innovation Solution
A pneumatic tire design featuring a block pattern with center and shoulder circumferential main grooves, center and shoulder lateral grooves, and improved inclination of these grooves relative to the belt cords, along with specific groove widths and angles to balance anti-hydroplaning and steering stability while maintaining noise performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If groove width and groove depth of tread grooves are increased to improve anti-hydroplaning performance, then drainage performance is enhanced, but steering stability performance and noise performance on dry road surface are degraded
Solution Approach 1:
The tread pattern divides the tread portion into multiple functional zones: center land portion with circumferential ribs for steering stability, intermediate land portions with inclined grooves for anti-hydroplaning, and shoulder land portions for additional drainage. Each zone has optimized groove characteristics tailored to its specific function, allowing simultaneous achievement of steering stability and anti-hydroplaning performance without compromising overall tire performance
2Reliability
If groove width and groove depth of tread grooves are increased to improve anti-hydroplaning performance, then drainage performance is enhanced, but noise performance on dry road surface is degraded
Solution Approach 1:
Different groove configurations are applied to different regions: the center land portion uses circumferential ribs that continuously extend to minimize noise generation, while intermediate and shoulder land portions use inclined grooves optimized for water evacuation. This localized differentiation allows the tire to achieve excellent anti-hydroplaning performance without the noise penalty that would result from uniformly increasing groove dimensions across the entire tread
3Reliability
If pattern rigidity is reduced to improve drainage performance, then anti-hydroplaning performance is enhanced, but steering stability is degraded
Solution Approach 1:
The tread pattern segments the tread portion into distinct land portions and groove systems. The center land portion is segmented into circumferential ribs that maintain high pattern rigidity for steering stability, while intermediate land portions are segmented with inclined grooves that provide drainage pathways. This segmentation allows different regions to have different rigidity characteristics optimized for their specific functions
Solution Approach 2:
Pattern rigidity is locally optimized: the center land portion maintains high rigidity through circumferential ribs for steering stability, while intermediate and shoulder land portions have reduced rigidity with inclined grooves to facilitate water evacuation. This localized differentiation in rigidity allows the tire to achieve both steering stability and anti-hydroplaning 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 achieves improved anti-hydroplaning performance, maintains high steering stability, and reduces noise through controlled air flow and resonance, while preventing degradation of noise and steering stability.
Implementation Method 1
compressed air from the inclined grooves e is blocked from flowing into the inner circumferential groove b1, air-column resonance in the inner circumferential groove b1 is controlled and noise performance is improved
Data Source
AI summary
A pneumatic tire tread includes center lateral grooves inclined to the reverse direction of the belt cords of the outermost belt ply of the belt, a groove width Wyc of the center lateral grooves being from 1.0 to 6.0 mm, shoulder lateral grooves being inclined to the same direction of the belt cords of the outermost belt ply, the shoulder lateral grooves having a narrow-width portion having a groove width Wys1 of from 0.4 to 1.5 mm at a position where it connects to a shoulder circumferential main groove, and a wide-width portion having a groove width Wys2 of from 2.0 to 8.0 mm which is connected to the narrow-width portion and extends beyond the tread ground-contact edge.