Pneumatic Tire Sipe Shift for Noise and Grip

The patent divides the tread surface into multiple land portion rows (central, intermediate, and outermost rows) with different sipe configurations. Each row is segmented to provide edge components while maintaining block integrity through strategic sipe placement and varying sipe depths in different sections.

Different land portion rows have different sipe arrangements: the central row has sipes for edge grip, the intermediate rows have selective sipe placement, and the outermost rows have reduced siping. This local differentiation allows each region to optimize for its specific function while maintaining overall block rigidity.

The patent implements different sipe configurations in different land portion rows to locally optimize noise performance. The central land portion row has sipes for edge grip, while the intermediate and outermost rows have reduced or selectively placed sipes, creating a gradient that reduces overall pattern noise while maintaining necessary edge components.

The sipe arrangements are asymmetric across different land portion rows, with the central row having more sipes than the outer rows. This asymmetric distribution reduces the uniformity of noise-generating elements across the tread, thereby reducing pattern noise while maintaining edge grip where most needed.

The patent provides sipes primarily in the central land portion row where edge grip is most critical for on-ice and on-snow performance, while reducing or eliminating sipes in the intermediate and outermost rows. This localized siping maintains block durability in regions where sipes would provide minimal performance benefit.

Instead of providing sipes throughout the entire tread surface, the patent applies sipes partially only in the central land portion row, which is sufficient to achieve the required edge component for winter performance while preserving block durability in the remaining tread areas.