Patent ID: 9527349
Filing Date: 2016-12-27
CPC Classification: B60C,Y10S

Claim Text:
1. A pneumatic tire comprising: a land portion formed in a tread surface; and a closed sipe provided in the land portion with at least three cuts extending in a radiation direction from an imaginary axis that extends in a depth direction of the land portion, and that terminate in the land portion, wherein the cuts of the closed sipe are provided with a spiral-like twist in the depth direction, centered on the imaginary axis, wherein the closed sipe forms the spiral-like twist, a twist angle of the cuts from a top surface to a bottom surface of the land portion is not less than 10° and less than 120°, a width of the cuts is formed larger at a tread surface side than at a bottom surface side in a depth direction of the closed sipes, and the width of the cuts becomes smaller in a gradual or stepwise manner from the tread surface side toward the bottom surface side of the spiral-like twist of the closed sipe.