Patent ID: 7347238
Filing Date: 2008-03-25
Classification: B60C,Y10S

Abstract:
1. A pneumatic tire in which at least a pair of circumferential main grooves extending along a tire circumferential direction is formed on a tread, the tread is defined into at least a plurality of land portion rows comprising at least a central land portion row at the tire equatorial plane side and bilateral land portion rows disposed at tire axial direction outer sides of the central land portion row, and a plurality of lateral grooves extending along the tire axial direction is formed in the central land portion row and the bilateral land portion rows, in the tire circumferential direction, wherein the lateral grooves which are formed on at least the central land portion row are extended from land portion both edges to land portion inner sides by at least 15% or more of the central land portion row tire axial direction width, and the central land portion row is defined into blocks or false blocks, and the blocks or the false blocks form chamfer portions, each having a depth gradually increasing toward the circumferential main groove and each facing the circumferential main groove, in surfaces of the tire circumferential direction one side corner portions of the central land portion row, whereby the vicinities of both sides in a tire width direction of the central land portion row are made uneven in the tire circumferential direction, and wherein the central land portion row chamfer portion is formed in the vicinity of an obtuse angled corner portion of the block or the false block as seen from a tread plan view of the block or the false block, is formed into a substantially trapezoid shaped tread plan view configuration whose upside faces the circumferential main groove side and whose base is substantially parallel to the tire circumferential direction, and has a planar shape which is inclined at a constant angle with respect to a tread surface.