초록 ▼

A heavy load pneumatic radial tire which has excellent wear resistance against heavy loads is herein disclosed. The radial tire has a tread portion which comprises long and short blocks for forming grooves which allow platforms to be disposed therein. Each of the platforms has predetermined height a

A heavy load pneumatic radial tire which has excellent wear resistance against heavy loads is herein disclosed. The radial tire has a tread portion which comprises long and short blocks for forming grooves which allow platforms to be disposed therein. Each of the platforms has predetermined height and length so that the total area of the grooves is decreased as the tread portion of the tire is worn.

대표청구항 ▼

A heavy load pneumatic radial tire provided with a tread portion having an outer peripheral configuration which is formed to have a radius of curvature ranging from 195 to 255 percentage of the width of said tire; said tread portion being constructed by a long block group and a short block group whi

A heavy load pneumatic radial tire provided with a tread portion having an outer peripheral configuration which is formed to have a radius of curvature ranging from 195 to 255 percentage of the width of said tire; said tread portion being constructed by a long block group and a short block group which are alternately arranged at substantially equal intervals in the circumferential direction of said tread portion; said long block group consisting of a plurality of long blocks staggeredly arranged and extending substantially laterally across the mid-circumferential plane of said tread portion from opposite sides of said tread portion, each of said long blocks being formed by a base portion extending substantially laterally from a said side toward said mid-circumferential plane and a V-shaped portion extending from said base portion over said mid-circumferential plane, said V-shaped portion having a laterally outer half adjacent said base portion and a laterally inner half remote from said base portion and intersected by said mid-circumferential plane; said V-shaped portion also having an inner side face and an outer side face, the inner side face of said laterally inner half of said V-shaped portion being spaced apart from and in face-to-face and substantially parallel relationship to the outer side face of the laterally inner half of the V-shaped portion of an adjacent long block; said short block group consisting of a plurality of short blocks staggeredly arranged between two adjacent long blocks and extending substantially laterally from a said side toward and terminating outwardly from said mid-circumferential plane, each of said short blocks being formed by a base portion adjacent a said side and spaced apart from and in parallel relationship to adjacent said base portions of said long blocks and a slanted portion extending toward said mid-circumferential plane in parallel relationship to said laterally outer halves of the V-shaped portions of adjacent said long blocks; each of said short blocks having a lateral inner end face which is spaced apart from and in face-to-face relationship with an opposed face of said V-shaped portion of a long block for forming a first groove, said first groove having a center spaced apart from that of an adjacent first groove in the lateral direction of said tread portion at a predetermined lateral distance which ranges from 30 to 42 percentage of the width of said tread portion.