Bridgestone Tire Company Limited

Muneyoshi Maeda

Masaru Abe

Hiroshi Kojima

Toshio Hayakawa

Hikaru Tansei

Shigeo Watanabe

Toshiyuki Sogi

Kazuyuki Endo

Hidenori Takahashi

A heavy duty pneumatic radial tire is disclosed, which comprises a carcass composed of at least one rubberized ply containing cords arranged substantially in a radial plane of the tire and a belt superimposed about a crown portion of the carcass just beneath a tread and composed of at least three rubberized belt plies. In this tire, metal cords of a first belt ply nearest to the carcass among the above belt plies are arranged at an angle of 25.degree.-50.degree. without crossing with metal cords of a second belt ply near the carcass next to the first belt ply with respect to a central circumferential line of the tire, and metal cords of the second belt ply and a third belt ply near the carcass next to the second belt ply, a tensile strength of each of which being 1.5-2 times that of the metal cord of the first belt ply, are arranged at an angle of 10.degree.-30.degree. and smaller than the cord angle of the first belt ply with crossing with each other between these two belt plies with respect to the central circumferential line of the tire.

Heavy duty pneumatic radial tires

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.

Heavy load pneumatic radial tire

Vehicle tire

A pneumatic radial tire for heavy load vehicles comprises a carcass and a belt for reinforcement of the carcass, said belt including tension members composed of at least two rubberized metal cords crossing with each other at a cord angle of not more than 25.degree. with respect to equatorial plane of tire, in which said metal cords is coated with a rubber having a modulus of elasticity of 40-80 Kg/cm.sup.2, a distance between the cords in each tension member is widened to 0.2-0.75 d based on a diameter d of the cord, and an interlaminar cord distance D between the tension members is uniformly shortened to 0.2-0.4 d at a central region extending within 50-80% of a superposed width of the tension members.

Pneumatic radial tire for heavy load vehicles

Growing community of inventors

Kodaira, Japan

Muneyoshi Maeda