PNEUMATIC TIRE TREAD

摘要

A pneumatic tire tread capable of mitigating air column resonance and maintaining drainage performance while ensuring that the flexible fences are abraded to a similar extent to the tread portion is formed from a rubber composition, and has a tread portion in which a primary groove is formed and multiple flexible fences is formed in the primary groove; the flexible fences are formed from at least a rubber composition for fences that is different from the rubber composition for the tread portion; the rubber composition for fences of the flexible fences has an abrasion index that is more than or equal to twice the abrasion index of the rubber composition of the tread portion; and the rubber composition for fences comprises a filler composition that is based on (a) a diene elastomer, (b) a filler A, which is more than 50 phr of filler A in which the filler particles are nanoparticles having an average grain size (by weight average) smaller than 500 nm; and (c) a filler B, which is more than 50 phr of filler B in which the filler particles are microparticles having a median grain size (by weight average) larger than 1 μm.

主权项

1. A pneumatic tire having a tread that is formed from a rubber composition and that contacts the road surface when the tire rolls, comprising:
a tread portion, in which is formed at least one primary groove of depth D and width W having a base surface and two opposing walls, and multiple flexible fences of thickness E, which extend inside the primary groove such that at least 70% of the cross-sectional area of the primary groove is blocked and which are disposed at intervals such that at least one of the multiple flexible fences is in the primary groove in the tread contact patch when the tire is rolling, wherein the multiple flexible fences are formed from at least a rubber composition for fences that is different from the rubber composition for the tread portion; the rubber composition of the flexible fences has an abrasion index that is greater than or equal to twice the abrasion index of the rubber composition of the tread portion; and the rubber composition for fences comprises a filler composition that is based on (a) a diene elastomer, (b) a filler A, which is more than 50 phr of filler A in which the filler particles are nanoparticles having an average grain size (by weight average) smaller than 500 nm; and (c) a filler B, which is more than 50 phr of filler B in which the filler particles are microparticles having a median grain size (by weight average) larger than 1 μm.