Pneumatic Tire Tread Round Chamfers for Early Wear Control

The patent applies curvature by forming round chamfers with a specific radius of curvature (0.5mm to 2.0mm) on the end edges of lands. This curved geometry replaces the conventional plane chamfer or sharp edge, distributing contact pressure more evenly across the land edge. The rounded profile prevents stress concentration at sharp corners, thereby suppressing uneven wear and rapid ground contact shape changes during early tire wear while maintaining manufacturing feasibility through standard molding processes.

The patent applies local quality by providing round chamfers selectively on specific end edges of lands (those extending in the tire circumferential direction) while maintaining other land features. The chamfer radius is optimized within a specific range (0.5mm to 2.0mm) to achieve the right balance: large enough to distribute pressure and prevent uneven wear, but small enough to preserve sufficient edge sharpness for traction. This localized application ensures wear uniformity without compromising the edge effect needed for grip.

The patent resolves this contradiction by introducing a controlled curvature (round chamfer) at the land end edges. The rounded profile with radius 0.5mm to 2.0mm eliminates stress concentration at sharp corners while preserving sufficient edge definition for traction. The curved surface distributes contact pressure along the rounded edge rather than concentrating it at a single point, thereby preventing rapid wear and ground contact shape changes while maintaining the edge effect necessary for grip through mechanisms like edge cutting and rubber deformation.