Bridgestone Corporation

Hidetoshi Yoda

Tomonori Aoki

Naoya Ochi

Hiroaki Ono

Tetsuhiko Sato

Side lug rows are provided at both side regions of a tread surface and are formed by a plurality of lugs defined by lug grooves opening to edges in the tread width direction, and a central block row aligned on the tire equator and formed by a plurality of blocks is disposed between positions at &#xbc; of the tread surface width from the tire equator. The tire has a directional tread pattern, with a designated rotation direction, formed by circumferential grooves and width direction grooves that define the blocks of the central block row and are narrow grooves with a narrower groove width than the lug grooves. The distance from the tire equator to the groove wall in each of the circumferential grooves defining the blocks is set to be larger at a leading edge of each block than at a trailing edge of each block.

Heavy load pneumatic tire for construction vehicles

Tire tread

Tread portion of an automobile tire

A heavy duty pneumatic radial tire comprising a carcass, a tread and a belt layer consisting of four belt plies piled radially one above another and containing steel cords therein. The four belt plies consist of a large belt ply having a width wider than that of the other belt plies, a middle belt ply arranged radially inward of the large belt ply and having steel cords oblique in the same directions as those of steel cords of the large belt ply, a first small belt ply arranged between the large belt ply and the middle belt ply and having steel cords oblique in opposite directions to those of the cords of the large belt ply and a width smaller than that of the middle ply, a second small belt ply arranged radially inward of the middle belt ply and having steel cords oblique in opposite directions to those of the cords of the large belt ply and a width smaller than that of the middle belt ply.

Heavy duty pneumatic radial tires with a belt comprising four steel cord

Growing community of inventors

Tokyo, Japan

Hidetoshi Yoda