Pneumatic radial tire

摘要

A pneumatic radial tire including a carcass composed of at least one carcass layer extending toroidally between a left-and-right pair of bead cores; a tread portion which is arranged on the outside in the tire radial direction of a crown region of the carcass to form a ground contacting portion; and a belt composed of two belt layers which is arranged between the tread portion and the crown region of the carcass to form a reinforcing portion. A reinforcing material constituting the belt layer is a bundle formed by arranging two cords in pairs; and, letting the diameter of a filament constituting the cord a (mm), the interval between the adjacent bundles as an expected value is increased by a/4 (mm) or larger compared to the interval represented by using the circumcircle of the cord.

主权项

1. A pneumatic radial tire comprising:
a carcass composed of at least one carcass layer extending toroidally between a left-and-right pair of bead cores; a tread portion which is arranged on the outside in the tire radial direction of a crown region of the carcass to form a ground contacting portion; and a belt composed of at least two belt layers which is arranged between the tread portion and the crown region of the carcass to form a reinforcing portion, wherein a reinforcing material constituting the belt layer is a bundle formed by arranging two cords without twisting them; each of the cords has a (1×2) structure consisting of two filaments, wherein the diameters of all filaments constituting the cord are the same, and, the diameter of each of the filaments being a (mm), an expected value of increment in bundle interval between adjacent bundles is a/4 (mm) or more greater than the interval between the adjacent bundles represented by using the circumcircle of the cord.