Patent ID: 9010390
Filing Date: 2015-04-21
Classification: B60C

Abstract:
1. A pneumatic tire, wherein plural blocks demarcated by circumferential direction grooves and transverse grooves are formed in a tread portion, in the blocks, there is formed at least one sipe in which bidirectional ridge portion rows are formed in one sipe wall surface and bidirectional valley portion rows that engage with the bidirectional ridge portion rows are formed in another sipe wall surface, and in the one sipe wall surface, there is formed a first pair of inclined ridge portions, the first pair of inclined ridge portions merged at a merged portion, and the first pair of inclined ridge portions respectively extending linearly from the merged portion toward different sipe-lengthwise-direction end sides so that the first inclined ridge portions become farther apart as the first inclined ridge portions extend in the radial direction away from the block ground-contacting surface; in the one sipe wall surface, there is formed a ground-contacting surface side ridge portion that extends from the merged portion toward a block ground-contacting surface side, wherein the ground-contacting surface side ridge portion is orthogonal to the block ground-contacting surface; and in the one sipe wall surface, there is formed an inclined valley portion that is adjacent to and arranged parallel to one of the first inclined ridge portions; in the one sipe wall surface, there is formed another inclined valley portion that is adjacent to and arranged parallel to another of the first inclined ridge portions, the inclined valley portions provided outside the inclined ridge portions with respect to the outer sipe-lengthwise-direction end sides; in the one sipe wall surface, there is formed a pair of ground-contacting surface side valley portions that respectively extend from the inclined valley portions toward the block ground-contacting surface side, wherein the ground-contacting surface side valley portions are orthogonal to the block ground-contacting surface; in the one sipe wall surface, there is formed a second pair of inclined ridge portions respectively adjacent to and arranged parallel to the inclined valley portions, the second pair of inclined ridge portions respectively extending linearly toward different sipe-lengthwise-direction end sides so that the second inclined ridge portions become farther apart as the second inclined ridge portions extend in the radial direction away from the block ground-contacting surface; and a pair of ground-contacting surface side ridge portions that respectively extend from the second inclined ridge portions toward the block ground-contacting surface side, wherein the ground-contacting surface side ridge portions are orthogonal to the block ground-contacting surface; in the one-sipe wall surface, one of the first pair of inclined ridge portions, one of the inclined valley portions, and one of the second pair of inclined ridge portions form a V shape in a direction perpendicular to the length direction of the sipe.