Asymmetric Tread Groove Layout for Dry and Wet Racing Tire Grip
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Solution Overview
Problem
Racing tires face challenges in achieving compatible dry and wet performance, as existing designs often compromise on traction in dry conditions to enhance wet handling.
Innovation Solution
The tire design features a biased arrangement of first and second circumferential grooves, with the second groove located further inward in the vehicle width direction, increasing the groove area ratio on the inner side for improved wet performance while enhancing traction on the outer side for dry conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If peripheral grooves are added to the tread contact surface to improve wet performance, then wet handling is enhanced, but dry traction deteriorates due to reduced ground contact area
Solution Approach 1:
The patent applies asymmetry by positioning the first circumferential groove at distance D1 from the equatorial plane and the second circumferential groove at distance D2 where D2 > D1. This asymmetric arrangement creates different groove area ratios on the inner side (improving wet performance) while maintaining sufficient ground contact area on the outer side (preserving dry traction), thereby resolving the contradiction between wet handling and dry grip.
Solution Approach 2:
The patent implements local quality by creating different groove configurations in different regions of the tread. The inner side features a larger groove area ratio for enhanced water evacuation and wet performance, while the outer side maintains adequate ground contact for dry traction. This regional differentiation allows simultaneous optimization of both wet and dry performance characteristics.
2Reliability
If groove area ratio on the inner side is increased to improve wet performance, then water evacuation is enhanced, but ground contact area on the outer side must be maintained for dry conditions
Solution Approach 1:
The asymmetric groove positioning with D2 > D1 creates an unequal distribution of groove areas across the tread width. This allows the inner side to have a higher groove area ratio for effective water evacuation while the outer side maintains sufficient ground contact area, simultaneously addressing wet performance enhancement and dry traction preservation.
Solution Approach 2:
The patent resolves the area conflict by transitioning from a uniform groove distribution to a dimensional arrangement where groove positions are optimized in the radial direction (distance from equatorial plane). By controlling distances D1 and D2 differently, the invention creates selective groove area ratios at different radial positions, enabling independent optimization of wet and dry performance areas.
Data Source
AI summary
A tire includes a mounting direction indicator indicating a tire mounting direction with respect to a vehicle. Additionally, the tire includes a first circumferential groove and a second circumferential groove extending intermittently or continuously in a tire circumferential direction. Additionally, the second circumferential groove is located further on an inner side than the first circumferential groove in a vehicle width direction in a state in which the tire is mounted on a vehicle. In addition, a distance D1 from the tire equatorial plane to the groove center line of the first circumferential groove and a distance D2 from the second circumferential groove to the groove center line have the relationship D1<D.