Patent ID: 9545824
Date: 2017-01-17
CPC Classifications: B60C

Claim:
1. A pneumatic tire comprising, on a tire tread surface, at least two longitudinal grooves extending along a tire equator, a plurality of transverse grooves connecting the longitudinal grooves, and a block row formed by a plurality of blocks extending along the tire equator and defined by the longitudinal grooves and the transverse grooves, wherein each block includes a reduced thickness portion in an overlapping region where the blocks overlap in projection when the block row is projected in a circumferential direction, the reduced thickness portion including at least two portions where a thickness of the block gradually decreases, and the reduced thickness portion comprises a plurality of steps, wherein an outermost step in a radial direction of the tire among the plurality of steps comprises an upper surface and two side surfaces adjacent the upper surface, the upper surface sloped with respect to the tire tread surface, the reduced thickness portion comprising the plurality of steps is formed step-wise so that a number of steps increases from a thinnest portion of the block to a thickest portion of the block from a block edge side toward a block interior side, a step closest to a groove bottom has a curved surface convexly protruding from a tread surface side of the block towards the groove bottom, the curved surface extending from the groove bottom to the tire tread surface, and the reduced thickness portion comprising the plurality of steps is formed step-wise so that the number of steps increases from a thinnest portion of the block to a thickest portion of the block in the tire circumferential direction, wherein the step closest to the groove bottom is on both sides of the outermost step in the tire circumferential direction.