Three-Arc Tread Profile for High-Load Dry Grip and Wear Control
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Solution Overview
Problem
Existing pneumatic tires experience uneven wear and reduced dry grip performance when subjected to high loads, particularly in circuit racing conditions.
Innovation Solution
The tire design incorporates a tread portion with specific arc radii and connection points, ensuring a smooth ground contact beyond the tread ends, enhancing uneven wear resistance and dry grip performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the tread portion has a conventional profile design, then the manufacturing is simpler, but uneven wear resistance and dry grip performance are insufficient under high load conditions
Solution Approach 1:
The tread profile is segmented into three distinct arc portions (first arc from equator to first connection point, second arc from first connection point to second connection point, third arc from second connection point to tread end) with different radius of curvature ratios. Each arc segment is optimized independently to control ground contact pressure distribution, preventing uneven wear while maintaining manufacturing feasibility through standardized arc construction methods
Solution Approach 2:
Different regions of the tread profile are assigned different radius of curvature characteristics: the first arc has a larger radius for overall stability, the second arc has a medium radius for transition zone control, and the third arc has a smaller radius for tread end pressure distribution. This local differentiation optimizes wear resistance and grip performance in each specific region without requiring complete redesign of the entire profile
2Reliability
If the tread profile is optimized for dry grip performance, then cornering force improves, but ground contact pressure becomes uneven causing localized wear
Solution Approach 1:
The invention changes the geometric parameters of the tread profile by controlling the radius of curvature ratios between different arc segments. Specifically, the first arc has radius R1, the second arc has radius R2 where 0.5 < R2/R1 < 0.8, and the third arc has radius R3 where 0.3 < R3/R2 < 0.6. These parameter relationships optimize both dry grip performance through improved contact pressure distribution and prevent uneven wear by avoiding excessive localization of stress
Data Source
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AI summary
A pneumatic tire 1 includes a first profile P1 extending from the tire equator C toward a first tread end T1. The first profile P1 includes a first arc 11, a second arc 12, and a third arc 13. A radius TR2 of curvature of the second arc 12 is 30% to 40% of a radius TR1 of curvature of the first arc 11. A radius TR3 of curvature of the third arc 13 is 25% to 40% of the radius TR2 of curvature of the second arc 12. A second connection point 15 at which the second arc 12 and the third arc 13 are connected to each other is disposed inward of the first tread end T1 in the tire axial direction. A distance La by which the second connection point 15 and the tire equator C are distant in the tire axial direction is 30% to 34% of a cross-sectional width of the tire. The third arc 13 extends outward in the tire axial direction beyond the first tread end T1.