Patent ID: 8708011
Filing Date: 2014-04-29
Classification: B60C

Abstract:
1. A pneumatic tire comprising: a plurality of land portions partitioned by grooves and formed in its tread surface; and at least one sipe formed in each of said land portions, wherein said sipe is formed so that sipe inner wall surfaces are formed perpendicularly to the tread surface, one or more recesses exposed on the tread surface are formed in at least one of said sipe inner wall surfaces opposed to each other, said one or more recesses have a sectional area gradually decreasing from an opening end of the sipe toward a sipe bottom and converges on the sipe inner wall surface before reaching the sipe bottom, wherein the length of said one or more recesses in the sipe depth direction is one third or more of the sipe depth, wherein the width of the one or more recesses gradually decreases from the opening end of the sipe toward the sipe b bottom, and wherein one or more inverted recesses having a sectional area gradually decreasing from the sipe bottom toward the sipe opening in a direction opposite to a direction of said one or more recesses are formed from the sipe bottom of said at least one of said sipe inner wall surfaces so as to converge on the sipe inner wall surface before reaching the opening end of the sipe.