Patent ID: 7077180
Filing Date: 2006-07-18
Classification: B60C,Y10S

Abstract:
1. A pneumatic tire including multiple blocks formed on a tread face and defined by and between a plurality of main grooves extending in a circumferential direction of the tire and by and between a plurality of sub grooves intersecting the main grooves, in which zigzag sipes extending in a width direction of the tire are provided on and into surfaces of the blocks, wherein the sipes are formed by shifting pitches of a zigzag shape on a tread face side of the sipe and a zigzag shape on a bottom side thereof in the width direction of the tire, and in the case of viewing concave and convex points according to a visual direction E along the circumferential direction of the tire, connecting a convex flexion point of the zigzag shape on the tread side and a concave flexion point of the zigzag shape on the bottom side which are facing each other, a concave flexion point of the zigzag shape on the tread side and a convex flexion point of the zigzag shape on the bottom side which are facing each other, and the convex points of the both zigzag shapes which are adjacent to each other, severally with edge lines, and interlinking the edge lines serially by planes in the width direction of the tire, wherein one of wall surfaces sectioned by the sipe is formed into a concavo-convex face A in which convex triangular pyramids and convex reverse triangular pyramids are alternately arranged in the width direction of the tire, and the other wall surface is formed into a concavo-convex face B in which concave triangular pyramids and concave reverse triangular pyramids are alternately arranged in the width direction of the tire, wherein a plurality of the concavo-convex faces A sectioned to be adjacent by the sipes are disposed in each of the two outermost positions in the circumferential direction of the block to be oriented outward from the block, and wherein angles of inclination of the edge lines, which severally connect the convex flexion points and the concave flexion points between the zigzag shapes on the tread face side and the bottom side facing one another, with respect to a direction of diameter of the tire are set in a range from 10° to 35° when the edge lines are projected onto a plane orthogonal to a direction extending from the sipe.