Abstract: A tread rubber of a pneumatic tire is formed by a ribbon rubber which is spirally wound around a tire rotating axis. The ribbon rubber is wound toward one side in a tire width direction from a start point which is positioned closer to a center side than tread ends in a tire meridian cross section, is next folded back to the other side in the tire width direction at the tread end on the one side, is wound toward the tread end on the other side beyond the start point, is next folded back to the one side in the tire width direction at the tread end on the other side, and is wound toward an end point. The ribbon rubber has the winding start end and the winding terminal end at tread end vicinity portions avoiding the tread ends and a tread center portion.

Abstract: A rubber composition for a tire sidewall includes 100 parts by mass of a rubber component comprising from 40 to 70% by mass of natural rubber and/or an isoprene rubber, and from 60 to 30% by mass of a butadiene rubber having 96% or more of cis-1,4 bond content, polymerized using a rare earth element-based catalyst, from 25 to 50 parts by mass of a filler comprising carbon black and/or silica, and from 0.3 to 3 parts by mass of a vulcanization accelerator, wherein the vulcanization accelerator comprises from 0.1 to 1.5 parts by mass of a sulfenimide compound represented by the following formula (1) and a sulfenamide-based vulcanization accelerator; wherein R represents a hydrocarbon group having from 1 to 18 carbon atoms.

Abstract: The invention can surely accomplish lamination without the generation of voids in building a tire constructed to comprise a plurality of rubber members for a tire when a ribbon-shaped rubber strip (R) is spirally wound and laminated, and uses holding rolls (30) and two sets of stitching rolls (40a), (40b) arranged in parallel with a center of a rubber strip width (W) therebetween to enable performing of an independent pressing motion, such that the rubber strip (R) is pressed and bonded by the holding rolls (30) in a position, in which the rubber strip (R) is wound, and the stitching roll (40a) or (40b) positioned fore in an advancing direction of traverse movement, out of the two sets, is caused to perform a pressing motion in a regional part just after the press whereby a fore part of the rubber strip in the advancing direction is pressed and bonded.

Abstract: An installation members 20 is structured detachably by a fitting structure between a groove portion 12 and a projection 21 extending in a tire peripheral direction CD, with respect to a tire side wall surface 10. a structure in which the groove portion 12 and the projection 21 interfere with each other in the tire peripheral direction is provided between the groove portion 12 and the projection 21.

Abstract: A pneumatic tire is disclosed. In one sidewall part, a sidewall rubber is formed by a black rubber over the whole circumference in a tire circumferential direction. In the other sidewall part, a different color rubber part for indicating marks on a tire outer surface is provided. The different color rubber part is divided into several sections in the circumferential direction, and the different color rubber part and the black rubber part are alternately and adjacently arranged in the circumferential direction. Side surfaces at both sides in the circumferential direction of the different color rubber part are formed into inclined surface shapes in a direction such that the side surfaces approach each other toward a tire inner surface side, thereby a size in the circumferential direction of the different color rubber part is decreased toward the tire inner surface side.

Abstract: A liquid-sealed vibration isolation device including: a cylindrical outer tube member; a boss member; a vibration isolation base body ; a diaphragm; a partition member; an orifice; a decompressing-cum-pouring hole allowing the liquid-sealed chamber to communicate with the outside; and a sealer sealing the decompressing-cum-pouring hole. In the liquid-sealed vibration isolation device, an annular attaching member is provided to which the diaphragm is vulcanizingly adhered on the inner peripheral side and which is formed into an annular shape when viewed in the axial direction and attached to the upper end side of the outer tube member, and the decompressing-cum-pouring hole is disposed in the annular attaching member.

Abstract: An annular rubber member is molded, across a through hole, on a support surface of a support device that includes the support surface and the through hole which opens to the support surface. The rubber member molded on the support surface is arranged so as to oppose a sidewall unit of a shaped tire intermediate body. The support device is moved close to the tire intermediate body and the rubber member on the support surface is brought into contact with the sidewall unit. The rubber member is adhered to the sidewall by moving the press member that presses the rubber member to the side wall unit via the through hole, in a tire radial direction.

Abstract: A manufacturing method of a pneumatic tire comprises a forming step of a tread rubber which includes a two-shot stage of simultaneously winding a first rubber ribbon constructed by a nonconductive rubber, and a second rubber ribbon constructed by a nonconductive rubber. In the two-shot stage, the first rubber ribbon and the second rubber ribbon which are adjacent to each other are spirally wound in such a manner as to come into contact with each other, and a ribbon winding position passes through an L-shaped route. A conductive rubber is partly provided in the first rubber ribbon in the winding process when the ribbon winding position passes through the L-shaped route. A conductive portion which spirally and continuously extends to the tread end from the ground-contacting surface and intermittently appears in the tire meridian cross section is formed by the conductive rubber.

Abstract: Two extruders are located at positions which are mutually shifted by 180 degrees around a rotation shaft of a rotary support, and are arranged at the same position in the rotation shaft direction of the rotary support, and each time the rotary support is rotated 180 degrees, the two extruders and the rotary support are caused to relatively move in the rotation shaft direction of the rotary support. In this manner, at least a portion of the pneumatic tire is molded by winding the rubber strip members onto the rotary support.

Abstract: A manufacturing apparatus of a rubber member includes an extruder that kneads and feeds a rubber material; a mouthpiece that discharges the rubber material supplied from the extruder; a support member that has a support surface opposing the mouthpiece; a rubber collection chamber that is formed between the mouthpiece and the support surface, that collects the rubber material discharged from the mouthpiece, and that has an opening in a front movement direction of the support surface with respect to the mouthpiece; and a shutter that opens and closes the opening. A plate-like rubber member is molded using the rubber material discharged from the mouthpiece onto the support surface by relatively moving the support surface and the mouthpiece.

Abstract: To provide a vibration isolation unit capable of reducing the number of parts, man-hour and material cost, and suppressing the product cost. One side of a stopper rubber member continues to the outer edge of a diaphragm. Accordingly, because they can be vulcanizingly molded simultaneously, the number of parts can be reduced. Also, because the diaphragm is attached to an outer tube member, the stopper rubber member also can be fixed simultaneously, and therefore the man-hour can be reduced. Further, because one side of the stopper rubber member continues to the outer edge of the diaphragm, overlapping of them in an axial view can be avoided, and a rubber material can be used efficiently. Thus, the number of parts, man-hour and material cost can be reduced and the product cost of the overall vibration isolation unit can be suppressed.

Abstract: A diametrical conductive portion extending in a tire diametrical direction in a tire meridian cross section is provided at least in a nonconductive position in a side rubber portion which is constructed by a side wall rubber and a rim strip rubber, a conductive branch portion is provided so as to be branched from the diametrical conductive portion, extend to at least one in a thickness direction of the side rubber portion and pass through an inner portion of the side rubber portion, and the conductive branch portion is arranged at a position which sections at least half position in the thickness direction of the side rubber portion into an outer side in a tire diametrical direction and an inner side in the tire diametrical direction, and is formed by a conductive rubber which has a different hardness from a rubber hardness of the side rubber portion.

Abstract: A rubber composition for adhering a steel cord that improves wet heat-resistant adhesioness, particularly heat-resistant adhesioness, by preventing adhesion deterioration due to heat, as well as initial adhesioness between a steel cord and a rubber, is disclosed. The rubber composition comprising 100 parts by weight of a diene rubber component and from 0.1 to 30 parts by weight of composite graphite particles containing boron, obtained by heating and graphitizing carbon black together with boron or a compound containing boron.