Bridgestone Tire Company Limited

Bridgestone Corporation

Minoru Togashi

Kenshiro Kato

Shin-ichi Furuya

Kuninobu Kadota

Hiroshi Hayakawa

Shinichi Furuya

Takashi Takusagawa

Nobumasa Ikeda

Masahiro Kuroda

Toshio Kita

Takeshi Takanami

Yoshiharu Goto

A bias tire for an aircraft includes a laminate formed by laminating a plurality of plies intersecting with each other and reinforced by organic fiber cords having a large thermal contraction coefficient. Both ends of the plies are turned up around bead cores. A profile curve I of a representative ply corresponding to that number counted from an innermost ply of the laminate plus one, which is one half of a total number of the plies when the tire mounted on a normal rim is filled with 1% of a normal inner pressure is constructed by a smoothly changing crown profile curve J and a smoothly changing side profile curves K. The crown profile curve J intersects a natural equilibrium profile curve H and is positioned between natural equilibrium profile curves E and H between both shoulder ends. The side profile curves K contact both the natural equilibrium profile curves E and H at rim points and smoothly connecting with the crown profile curve J and are positioned outwardly of the natural equilibrium profile curves E and H between the shoulder ends and rim points.

Bias tire for aircraft

A heavy duty pneumatic radial tire includes a carcass consisting of at least one layer of metal cords substantially radially arranged, a breaker consisting of at least two layers of metal cords to form a main reinforcement with the carcass, and bead portions including hard and soft stiffeners. The carcass has a particular radial profile having a ratio of radii R/R' determined by a radius R' of a standard circle and a radius R determined by a particular definition and has a maximum distance f between an arc of the standard circle and the remaining carcass line smoothly extending from the profile curvature of the shoulder. Moreover a radial profile over a radially inner zone of the sidewall of 20-45% of the radial height SH has a curvature 1/.rho. less than 6.times.10.sup.-3 mm.sup.-1 at a location 32.5% of the radial height corresponding to a center of the profile.

Reduced rolling resistance pneumatic radial tire

A pneumatic radial tire is adapted to improve or reduce the rolling resistance and simultaneously to improve the steering stability and riding comfortability against vibration during running without adversely affecting the wet performance and durability by making higher the carcass maximum width position and the carcass curvature reverse position, or enlarging the curvature of the carcass in the radially outer zone of the carcass maximum width position and simultaneously the carcass curvature reverse extent in the radially inner zone of the sidewalls so as to intentionally deviate from the naturally equilibrated configuration. A method of manufacturing a reduced rolling resistance pneumatic radial tire uses a mold for vulcanizing and forming the tire therein, which mold has a particular shape of cavity having a foot width 20-50% wider than a rim width and diverging progressively from shoulder corresponding portions to the wider foot portion of the cavity.

A pneumatic radial tire for passenger cars having a low rolling resistance and an excellent wet skid resistance is disclosed. The radial tire comprises a carcass of a radial construction toroidally extending between a pair of bead cores with the ends turned thereover, a tread portion arranged outside a crown portion of the carcass and having a two laminate structure of tread base rubber and tread cap rubber, and a reinforcing belt layer embedded in the tread base rubber and superimposed about the crown portion of the carcass. The tread base rubber and tread cap rubber have resiliences of not less than 65% and not more than 60%, respectively. The tread portion has a sectional ratio of a sectional area of the tread cap rubber occupied in the equatorial section of tire to a total sectional area of the tread portion of not less than 50% and a negative ratio of not more than 45%. The belt layer has a flatness of not more than 15%.

Pneumatic radial tires for passenger cars having low rolling resistance

Reduced rolling resistance pneumatic radial tire and method of

Growing community of inventors

Tokyo, Japan

Minoru Togashi