Toyo Tire Rubber Co., Ltd.

Shigeo Kudo

Tetsuo Tatara

Osamu Fujiki

Mitsuru Hitotsuyanagi

Toshiyuki Tanaka

Masami Tanabe

Yasuhide Ohtake

An object is to reduce a cycle time for fabricating a low rolling resistance pneumatic tire and to provide the same pneumatic tire. As a means therefor, in building a tread portion by winding spirally a rubber strip material whose cross section is divided into a first region made of a conductive rubber and a second region made of a non-conductive rubber in a tire circumferential direction in a partially overlapping fashion by the use of an extruding machine which extrudes continuously the rubber strip material, an area ratio of the first region relative to the cross section of the rubber strip material is made to change in a tire width direction.

Method of fabricating pneumatic tire and pneumatic tire

An object is to provide a pneumatic tire which can exhibit a static elimination function in an ensured fashion and be fabricated easily. As a means therefor, there is provided a pneumatic tire in which a conductive layerand a non-conductive layerare wound alternately in a tire circumferential direction in a partially overlapping fashion at least in part of a tread portion, characterized in that the conductive layeris provided wider than the non-conductive layer

Pneumatic tire

When forming a rubber member which is made up of a combination of a plurality of rubber compounds by winding spirally a ribbon-shaped unvulcanized rubber strip material in an overlapping fashion, the number of times of winding is reduced so as to shorten a fabrication cycle time of the rubber member to thereby increase the productivity thereof. As a means therefore, a rubber strip material whose cross section is divided into two or more regions which are made up of different rubber compounds is wound spirally on to a drum in an overlapping fashion so as to build a green tire or a tire rubber member.

Rubber strip material

The invention provides a radial tire, in which a single rubber coated cord (C) is used to form a carcass layer () without generating any material jointed portion and which is favorable in weight balance, external appearance, and quality and excellent in productivity, the carcass layer () is formed from at least one cord row layer (A) formed by cutting a rubber coated cord (C), which is formed to make an external shape of a cross section elliptical, one by one, to align and bond the same in a tire circumference direction, and the cord row layer is jointed only in a single location on a tire circumference to generate little overlap.

Radial tire and method of manufacturing the same

The invention is made to accelerate extrusion forming by reducing a friction between a forming rubber formed to cover a cord or formed to extrude and an inner wall face of a path at inside of a die as the die used for an extrusion forming head, a portion of an upstream portion of a rubber forming path () reaching a front end outlet () from a rubber storing portion () at inside of a die main bodyis provided with a fluid sending inlet () for sending a fluid between an outer peripheral face of a forming rubber (R) at inside of the rubber forming path () and an inner wall face of the path and a resistance of passing the forming rubber (R) on a downstream side is reduced by the fluid.

Die for extrusion forming head

The invention can efficiently provide a carcass member constituting a carcass layer of a radial tire, particularly, a carcass member a direction of a cord of which constitutes an angle of substantially 90&#xb0; relative to a tire circumferential direction, and can easily adjust a length in accordance with a size, one piece of a cord (C) is continuously passed through a rubber coating die () to coat rubber on the cord, the rubber coated cord (C) is shaped such that a sectional outer shape thereof constitutes an elliptical shape, the rubber coated cord (C) is wound around an aligning drum () while adjusting a direction of the elliptical shape by way of an aligning guide () to bond without producing a gap to form a cylinder-like member (A), thereafter, the cylinder-like member (A) is cut in a direction in parallel with the drum axis center to constitute a sheet-like shape.

Method and apparatus of fabricating carcass member for tire

A method and device for manufacturing tire's annular member having a stretch mainly in radial direction by use of simple devices and simple way of pressing with high precision and easiness, as to produce tire product in high quality with no fluctuation of mass and/or uniformity, comprising: a first mold including a profile mold having an annular recess; a second mold which faces the first mold; and an extruder that continuously extrudes a rubber body into the recess of the profile mold. Concurrent with such extruding, the profile mold is rotated by one turn so as to charge the rubber body into the annular recess in a manner as annularly continuous. Then, the first and the second molds are brought abut each other so as to press the rubber body between the profile and second molds; thus shaping the rubber body into a shape defined by the profile mold.

Method and device for forming tire's annular member

Method for forming a rubber strip which enables a wider rubber of small thickness without lowering an extruding speed and enables to reduce a building cycle time, thereby increasing the efficiency of tire manufacturing. Temperatures at a main-part casing, a screw shaftand a head region included with the dieare controlled to be different from each other in a manner that: the temperature as controlled in the main-part casingis higher than that in the screw shaft; and the temperature as controlled in the head region is higher than that in the main-part casing, when continuously extruding a rubber material in a form of a ribbon in forming a rubber strip

Method of and apparatus for forming rubber strip materials for building tires and method of building tires

The invention eliminates the drawbacks that strip-like members develop curling sets during storage and that the amounts of shrink of strip-like members vary, and minimizes the amounts of remnants of strip-like members after formation of one lot and the number of length measuring and cutting devices for strip-like members. A strip-like member 12 is formed in long size and cut into predetermined lengths during transfer on conveyers 13 an 14. The resulting strip-like members 12 of predetermined length are placed one by one on smooth-surfaced pallets 20, the latter being transferred to a tire building machine. One end of such strip-like member 12 on the pallet is brought into contact with the lower surface of the building drum 30. The building drum is rotated while the pallet is moved in the direction of the length.

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Osaka, Japan

Shigeo Kudo