Tire Lug Groove Angle Optimization for Snow Grip and Anti-Hydroplaning
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Solution Overview
Problem
Conventional tires with diagonal lug grooves face a trade-off between snow grip performance and anti-hydroplaning performance, where smaller angles improve acceleration on snow but reduce water expulsion efficiency, and larger angles enhance anti-hydroplaning but compromise snow grip.
Innovation Solution
The tire features V-shaped lug grooves with varying diagonal angles across different tread portions, ensuring larger differences in the center and second portions for improved snow grip and smaller differences in the shoulder portion for enhanced anti-hydroplaning, with specific angle ranges and groove configurations to balance both performance metrics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If smaller diagonal angles for lug grooves are used to secure acceleration performance on snow, then grip performance on snow is improved, but water expulsion efficiency is reduced leading to lowered anti-hydroplaning performance
Solution Approach 1:
The patent applies local quality by differentiating lug groove diagonal angles across different tread portions. The center portion uses a first diagonal angle range (10° to 30°) optimized for snow grip, while the shoulder portion uses a second diagonal angle range (30° to 60°) optimized for water expulsion. This spatial variation in groove geometry allows each region to perform its specialized function effectively.
Solution Approach 2:
The tread pattern is segmented into distinct functional zones: a center portion for snow acceleration and a shoulder portion for hydroplaning resistance. Each segment has independently optimized lug groove angles, creating a multi-functional tread design that addresses conflicting performance requirements through spatial division of labor.
2Productivity
If larger diagonal angles for lug grooves are used to improve anti-hydroplaning performance, then water expulsion efficiency is improved, but grip performance on snow is reduced leading to inadequate acceleration performance on snow
Solution Approach 1:
The patent implements local quality by assigning different diagonal angle characteristics to different tread regions. The shoulder portion employs larger diagonal angles (30° to 60°) to maximize water evacuation capability, while the center portion uses smaller angles (10° to 30°) to maintain optimal snow grip. This localized optimization resolves the contradiction by allowing each region to excel at its primary function.
Solution Approach 2:
The tread is divided into functionally segregated zones where the shoulder portion handles water expulsion with steeper groove angles and the center portion handles snow traction with gentler angles. This segmentation enables simultaneous optimization of both anti-hydroplaning and snow acceleration performance without compromise.
Data Source
Figure 1
Figure 2~3
Figure 4A~4B
AI summary
A tire having V-shaped lug grooves displays both improved grip performance on snow and anti-hydroplaning performance. To that end, an absolute value of difference between a lug groove diagonal angle (θLG), which is an angle of diagonal lug grooves (13) in a tread (11) surface with respect to a tire axial direction, and a profile line diagonal angle (θFP), which is an angle of a normal line of a leading-end profile line of a contact patch shape of the tire (10) with respect to the tire axial direction, is set to 0° or more and 60° or less at respective positions in the tire axial direction. And diagonal lug grooves (13) are formed such that absolute values of difference in a center portion, which is defined to be 20% in width of a contact patch width (W) with an equatorial plane at a center, and an intermediate portion, which is defined to be 20% of the contact patch width (W) on each axially outer side adjacent to the center portion, are larger than an absolute value of difference in a shoulder portion, which is defined to be 20% of the contact patch width (W) on each axially outer side adjacent to the intermediate portion.