Sumitomo Rubber Industries Limited

Masayuki Sakamoto

Toshihiko Omokawa

Yutaka Kuroda

Kazuya Suzuki

Masahiro Hanya

Takamichi Sagawa

Susumu Tanaka

Katsuhito Miura

Kenji Ueda

Hideaki Sugihara

Hideaki Yoshikawa

Yukio Endo

Seiki Yamada

Shinzo Kajiwara

Atsushi Yamakage

Ryo Ono

Takuya Mizuta

Tomoo Tanaka

Takuma Konishi

Nobuaki Minami

Takayuki Nagase

Takafumi Taguchi

Tsutomu Iseki

Toru Nishikawa

Takeshi Kuroki

Kazuaki Yarimizu

Hiroshi Matsui

Yasuhiro Narahara

Gaku Tanaka

Yuichi Takai

Takuji Kusumoto

Sakae Okubo

Hideo Nobuchika

Saki Okudaira

Toshiyuki Mafune

Norikatsu Nakata

Emiko Yamamoto

Yoshiyuki Kawai

Toshiaki Ono

Kotaro Hirose

Osamu Togawa

Hisanobu Uenosono

Hiroki Miura

A tire repairing apparatus includes: a tire support portion rotatably supporting a pneumatic tire; and an application mechanism configured to apply an additive that has a softening effect, to a tread portion of the pneumatic tire supported by the tire support portion, thereby causing the additive to permeate into the tread portion.

Tire processing apparatus, tire repairing apparatus, repair sheet, tire repairing method, and tire manufacturing method

The extruder includes: a cylinder having a first end portion and a second end portion respectively formed at two ends of the cylinder in an axial direction, and an ejection port formed in the first end portion; a screw including a shaft that is configured to rotate within the cylinder, and a screw blade that is provided on an outer circumferential surface of the shaft; a supplier that is attached to the second end portion side of the cylinder and is configured to supply a kneading target to an inside of the cylinder; and a plurality of protruding members that protrude from an inner wall surface of the cylinder.

Extruder

A method for producing a rubber member according to the present invention includes the steps of: supplying a rubber composition to a cylinder provided in an extruder; extruding the rubber composition to a downstream side of the cylinder while kneading the rubber composition in an internal space of the cylinder that includes a plurality of protruding members protruding from an inner wall surface of the cylinder; compressing the rubber composition at least once in the step of extruding the rubber composition to the downstream side; discharging a gas generated from the compressed rubber composition to outside of the cylinder; discharging, through a discharge outlet of the cylinder, the rubber composition after the gas has been generated; and molding the rubber composition that has been discharged through the discharge outlet into a predetermined rubber member shape.

Method for producing rubber member

A pneumatic tire manufacturing method is provided in which raw cover molding is suitably performed with no, or a minimal amount of, down-stitching in the manufacture of SOT-structure pneumatic tires; also provided is a pneumatic tire. This pneumatic tire manufacturing method involves a first cover molding step for molding a first cover having a sidewall, an inner lining, a ply, beads and a tread-side edge, a tread ring forming step for forming a tread ring having a breaker, a band and a tread center part, a shaping step for pressure-bonding the tread ring and the first cover to mold this to the shape of the raw cover, and a turn-up step for bonding the side wall to the lateral surface of the first cover, wherein the tread-side edge is formed in a position adjacent to the end of the tread center portion in the shaping step, and in the turn-up step, the tread-side edge and the tread center part are bonded together.

Pneumatic tire manufacturing method, and pneumatic tire

A pneumatic tire manufacturing method is provided in which winding collapse is prevented, there is no possibility of adverse effects on the FV, a current-carrying layer can be formed easily, and down-stitching can be dispensed with or minimized in the manufacture of SOT-structure pneumatic tires having a base-pen structure in the tread. This pneumatic tire manufacturing method involves: a step in which a sidewall, an inner liner, and a ply are bonded on a first molding drum, beads are set, and the tread side part that will form the current-carrying layer is formed on the side wall, forming a first cover; a step in which a breaker and band are bonded on a second molding drum and the tread center part is formed on the band, shaping the tread ring; a step in which the first cover is inserted inside of the tread ring and inflated to bond to the tread ring with pressure; and a step in which the sidewall is bonded to the lateral surface of the first cover, and the tread side part and the tread center part are bonded together.

A pneumatic tire manufacturing method is provided in which raw cover molding is suitably performed with no, or a minimal amount of, down-stitching in the manufacture of SOT-structure pneumatic tires; also provided is a pneumatic tire. This pneumatic tire manufacturing method involves: a step in which a sidewall, an inner liner, and a ply are bonded on a first molding drum, a pair of beads is set, and the tread side part is formed on the side wall, forming a first cover; a step in which a breaker and band are bonded on a second molding drum and the tread center part is formed on the band, shaping the tread ring; a step in which the first cover is inserted inside of the tread ring and the first cover is inflated, bonding the tread ring and the first cover with pressure; and a step in which the sidewall is folded back towards the lateral surface of the inflated first cover and bonded to the lateral surface of the first cover, and the tread side part and the tread center part are bonded together.

A technique for easily taking out a main body of a core mold is proposed. An annular core-mold main portionhaving a molding surfacefor shaping an inner surface of a pneumatic tire is included, and the core-mold main portionis composed of a plurality of segments each of which is taken out toward the inside in a radial direction. In the molding surfaceof the core-mold main portion, a ratio Bd/W of a maximum width W lying in regions for shaping sidewall portions and a width Bd in the tire axial direction measured at toe-end shaping positionsfor shaping toe ends of bead portions is not less than 0.80. In an inside zonefrom the toe-end shaping positionof the molding surfaceto the position of the maximum width W, the angle &#x3b1; of a tangent T drawn to the molding surfaceis not more than 15 degrees. The inside zoneincludes an oblique partin which the angle &#x3b1; of the tangent T is 30 to 45 degrees, and a ratio h/H of a length h in a radial direction of the oblique partand a length H from the toe-end shaping positionto an intersecting point P of a line drawn in the tire radial direction from the toe-end shaping positionoutwardly in the radial direction with the molding surfaceis less than 0.25.

Rigid core mold and method for manufacturing pneumatic tire using the same

According to the present invention, the cycle time is reduced for a core removal step while suppressing displacement of the affixing position for the rubber member during a green-tire forming step. This rigid core has a ring-shaped core body having a tire forming surface for molding the inner surface of a pneumatic tire. The core body is formed from a plurality of core segments that are split in the circumferential direction and movable in the tire radius direction. The surface roughness (Ra) of the outer surface of the core segments forming the tire forming surface is 2.0-20.0 &#x3bc;m.

Rigid core and method for manufacturing pneumatic tire using same

A pneumatic tireis provided in a bead portionwith a bead coreformed of a bead wire. The bead corehas a wound single bead wire structure formed from turns of the single bead wire, and has at least three wire layers. Each side face of the bead corehas a shape such that it is possible to draw a common tangentto at least two turns of the bead wireappearing in the side facewhich common tangent is substantially parallel with the tire radial direction. The turns of the bead wirein the 1st wire layerare alternated with the turns of the bead wirein the 2nd wire layerdisposed on the outside of the 1st wire layer. The 1st wire layerincludes a turnhaving the winding-start endof the bead wire, which turnis positioned between adjacent two turnsof the bead wire in the 2nd wire layer

Pneumatic tire

A method for manufacturing a tire having a sidewall portion provided with a projecting marking is disclosed. A stencil plate for molding the projecting marking is made of a thin metallic plate whose thickness is 0.2 to 0.8 mm and mounted in a recess formed in a sidewall molding surface of the tire vulcanization mold. A concave marking part for molding the projecting marking is formed by press working upon the metallic plate. Edge portions of the stencil plate are turned back. The backward extension Hof the turnback is substantially the same as the depth of the concave marking part.

Method for manufacturing tire and pneumatic tire manufactured thereby

The present invention enhances noise performance and anti-uneven wear performance. A pneumatic tireincludes a belt layerincluding at least one belt ply in which belt cordsare arranged at an angle of 10 to 40&#xb0; with respect to a tire equator C. A tread pattern formed on a surface of the tread portionincludes a pitch linein which at least two kinds of pattern-constituting unitshaving different pitches in a circumferential direction of the tire are arranged in the circumferential direction of the tire. The belt cordsare arranged relatively densely on an inner side of the pattern-constituting unithaving a small pitch, and relatively thinly on an inner side of the pattern-constituting unithaving a large pitch.

Pneumatic tire and producing method thereof

A green tire includes a surface layer defining a green tire surface and made up of a plurality of windings of an unvulcanized rubber tape. A part of each of the windings is exposed on the green tire surface so that the exposed part has a width of from 50% to 80% of the width Wof the rubber tape. Each of the windings has a substantially rhomboid cross section and has one end at an acute angle corner exposed on the green tire surface and the other end at the opposing acute angle corner. An angle theta of a diagonal line of the rhomboid drawn between the one end and the other end is not more than 30 degrees with respect to a tangential line to a profile line of the green tire surface.

Green tire and method for manufacturing pneumatic tire

A method for manufacturing a pneumatic tire with a noise damper on the inside of the tread portion, comprises the steps of: building a raw tire on an annular tire building core; placing the raw tire within a vulcanizing mold together with the core; and heating the raw tire in the mold. The tire building core has a molding face for molding an inner surface of the tread portion. The molding face is provided with a groove extending in the tire circumferential direction. In the step of building the raw tire, an expandable damper material is placed in the groove. During heating the raw tire to be vulcanized, the damper material expands in the groove, whereby the expanded material forms the noise damper integrated into the radially inside of the tread portion.

Method for manufacturing pneumatic tire

A method and an apparatus for butt-jointing edges of an elastic material sheet is disclosed. The elastic material sheet is supported such that the two edges to be butt-jointed are oppositely opposed. By moving a pair of counterrotating conical surfaces along the edges, the surfaces of the edges portions are drawn toward the center between the two edges so that the edges are butt-jointed. Between the conical surfaces, a small space is provided so as to form a small rib-like protrusion along the butt-joint. Then, the small rib-like protrusion of the elastic material is pressed down to flatten. Therefore, at the butt-joint interface, the elastic material irregularly interfuses to increase the strength of the butt-joint.

Method and apparatus for butt-jointing edges of elastic material sheet

A manufacturing method of a rubber member for a tire includes a winding step in which a rubber strip is spirally winding and overlapping around a surface of a to-be wound body, thereby forming a tire rubber member around which the rubber strip is overlapped. A plurality of air-vent grooves are formed on at least one of surfaces of the rubber strip. Each air-vent groove extends at an angle &#x3b8; of 20 to 90&#xb0; with respect to the longitudinal direction of the rubber strip, the maximum groove width of the air-vent groove is 0.3 to 3.0 mm, and the maximum groove depth thereof is 0.1 to 3.0 mm.

Growing community of inventors

Kobe, Japan

Masayuki Sakamoto