Patent ID: 7481257
Filing Date: 2009-01-27
Classification: B29D,B60C,Y10S

Abstract:
1. A pneumatic tire which is cured and molded by a sectional type tire mold including an annular side mold section having a tread forming surface for forming a tread surface, the side mold section comprising a plurality of sectors into which the side mold section is divided along a circumferential direction of the side mold section, the tread forming surface of the side mold section having sector divisional position vicinity regions including sector divisional positions and sector divisional position distant regions located therebetween, the pneumatic tire having a tread surface which includes first regions formed by the sector divisional position vicinity regions, where the first regions extend along an entire axial width of the tread surface, and second regions formed by the sector divisional position distant regions, where the second regions extend along the entire axial width of the tread surface, the tread surface having lands defined by at least one circumferential groove which extends in a circumferential direction of the tire, sipes which extend from the at least one circumferential groove into at least one of the lands with their extension ends located within the at least one land being disposed at predetermined intervals along the tire circumferential direction, wherein the sipes comprise first sipes and second sipes, and each first sipe has a tire widthwise direction length W wherein the first sipes are disposed only in the first regions, and the second sipes are disposed only in the second regions, and further wherein said first region and said second region are alternately arranged in the circumferential direction of the tire, the first region being a region located between a position on the tread surface corresponding to the sector divisional position and a position ranging from 20 to 40 mm from said position corresponding to the sector divisional position on each side thereof in the circumferential direction of the tire.