Sumitomo Rubber Industries Limited

Ikuji Ikeda

Kiyoshi Ueyoko

Kazuki Numata

Yukio Endo

Yoshio Ohara

Naohiko Kikuchi

Yoshikazu Tanaka

In a method for forming a green tread rubber comprised of a cap rubber layer which outer surface forms a tread surface and a base rubber layer that adjoins the same inside thereof in the radial direction, a cap rubber having a rubber component of styrene/butadiene rubber or being a mixed rubber of natural rubber and butadiene rubber is used as the cap rubber layer. The base rubber layer is formed as an annular body in which a strap-like rubber extruded body of wide width, which is extruded from a rubber extruder and is cut into constant size, is wound around a molding drum by a single round with their end portions in a circumferential direction being joined with each other. The cap rubber layer is formed as a strip layered body in which a long strap-like rubber strip of narrow width, which is extruded from an rubber extruder, is successively wound by overlapping the same on the annular body in the circumferential direction and in a spiral manner. A thickness Tof the base rubber layer on a tire equator is defined to be 0.05 to 0.7 times a thickness Tof the green tread rubber on the tire equator.

Method for forming a green tread rubber and a pneumatic tire formed by using green tread rubber

A method of manufacturing a pneumatic tire comprises assembling unvulcanized rubber components to make a green tire, vulcanizing the green tire, and winding an unvulcanized rubber tape so that the windings collectively have a predetermined cross sectional shape for at least one of the unvulcanized rubber components to thereby make said at least one of the unvulcanized rubber components.

Method of manufacturing pneumatic tire

A tread rubber G has a short-fiber-mixed rubber portionforming a grounding surface. In a region Ybetween an outer grounding end Eo and a tire equator C located outside of a vehicle when a tire is mounted to the vehicle, the short fibers f are inclined and oriented at an angle &#x3b1; outward of the vehicle radially outward of the tire, and an angle &#x3b1;of the short fibers f in the outer grounding end Eo is greater than an angle &#x3b1;of the short fibers f in the tire equator C.

Pneumatic tire and method of manufacturing the tire

A rubber-coated fabricfor a tire, obtained by rubber-coating a rattan blind woven stuffin which weftsand warpsmade of tire cordsare woven into a rattan blind form. The weftshave a break elongation of 4 to 30% and a break strength of 3 to 15 N.

Tire-use rubber-covered fabric, production method therefor, production method for pneumatic tire using rubber-covered fabric, and pneumatic tire

A pneumatic tire comprises a carcass ply extending between bead portions and is turned up around a bead core in each bead portion to form two turnup portions and a main portion therebetween; each of the turnup portion extends radially outwardly and adjoins the main portion from a certain height above the bead core; a space is surrounded by the carcass ply main portion, and each turnup portion and the bead core is filled with a small size bead apex rubber or a gas; and the bead portion is provided between the carcass ply and the bead core with a bead core cover for preventing the carcass cords from direct contacting with the bead core.

Pneumatic tire with specified bead portion

A heavy-duty pneumatic radial tire and rim assembly ha s a support ring within the tire to support the tire in a deflated condition, wherein the inner diameter Di of the inside bead portion which is inside with respect to the vehicle is substantially 80 to 200 mm larger than the inner diameter Do of the outside bead portion.

Heavy-duty pneumatic radial tire and wheel rim assembly with support ring

A pneumatic tire comprises a carcass ply extending between bead portions and is turned up around a bead core in each bead portion to form two turnup portions and a main portion therebetween; each of the turnup portions extends radially outwardly and adjoins the main portion from a certain height above the bead core; a space is surrounded by the carcass ply main portion, and each turnup portion and the bead core is filled with a small size bead apex rubber or a gas; and the bead portion is provided between the carcass ply and the bead core with a bead core cover for preventing the carcass cords from direct contacting with the bead core.

Growing community of inventors

Kobe, Japan

Ikuji Ikeda