Patent ID: 6910512
Filing Date: 2005-06-28
Classification: B60C,Y10S

Abstract:
1. A pneumatic tire comprising a tread including a plurality of blocks demarcated by circumferential grooves extending in a circumferential direction of the tire and grooves intersecting the circumferential grooves, wherein a peripheral protuberant portion is formed on a tread surface of each block in the vicinity of an end edge thereof so that the height of the block gradually and continuously decreases from a top of the peripheral protuberant portion to a groove wall surface of the block and from the top of the peripheral protuberant portion to a maximum depth portion in a central region of the block, and wherein said peripheral protuberant portion extending from the top of the peripheral protuberant portion to the groove wall surface defines a chamfer portion, and an angle formed by a tangential line of the chamfer portion with respect to a horizontal extension line of the surface of the top of the peripheral protuberant portion in a heightwise cross section perpendicular to the groove wall surface increases from the top of the peripheral protuberant portion to the groove wall surface; the chamfer portion having a radius of curvature R wherein the peripheral protuberant portion is disposed in vicinities of the end edges on at least one side of the block in a transverse direction of the tire; and a dimension HH