The present invention increases tire formation precision and is a tire manufacturing method, which comprises a step S1 for forming a green tire on the outer surface of a rigid inner mold and a vulcanization step S2 for vulcanizing the green tire. The rigid inner mold comprises: an inner mold body, which is obtained from multiple segments; a core, which substantially binds the various segments; and an outer diameter adjusting means for changing the outer diameter of the core by changing the temperature of the core. Moreover. the rigid inner mold performs changes such that by expansion of the outer diameter of the core 5, the various segments move outward in the radial direction of the tire and gaps between the segments are enlarged, while by reducing the outer diameter of the core, the various segments move inward in the radial direction of the tire and the level differences R on the outer surface between adjacent segments increase. The vulcanization step S2 comprises an adjustment steps S21 for adjusting the outer diameter of the core using the outer diameter adjustment means so that the gaps G and the level differences R are within a previously established range.

A tire is provided, which includes: a circular tire frame formed from a resin material containing an olefin resin; and an exterior member formed from a thermoplastic rubber vulcanizate which contains an ethylene-propylene-diene rubber and a polyethylene-based resin, and in which a content of the ethylene-propylene-diene rubber is from 20% by mass to 45% by mass with respect to a total mass of the thermoplastic rubber vulcanizate, and a fluidity is from 1.0 g/10 min to 60 g/10 min.

To prevent rubber from becoming membrane-like mold flash between mating faces and being adhered. It is a rigid core for forming a tire which comprises an annular core main body provided in an outer surface thereof with a tire molding surface for forming a raw tire. The core main body is composed of a plurality of core segments which are divided in a circumferential direction, and each of the core segments has both circumferential end surfaces as mating faces, and the mating faces adjacent to each other in the circumferential direction are butted to each other so as to form the core main body. Each of the mating faces is provided with a border recess extending along an outer peripheral edge of the mating face and formed by cutting away a corner between the tire molding surface and the mating face.

Provided is a rigid core for tire formation that limits the rubber stuck between inner mold segments in an inner mold segment while minimizing the occurrence of unevenness in the radial direction between inner mold segments that is caused by thermal expansion. A core main body 2 is divided into: a first inner mold segment 5A in which both circumferential end surfaces 5As are inclined radially inward in a direction in which the circumferential width increases; a second inner mold segment 5B that is arranged in an alternating manner with the inner mold segment 5A and in which both circumferential end surfaces 5Bs are inclined radially inward in a direction in which the circumferential width decreases; and a butting member 6 that is arranged between the first inner mold segment 5A and the second inner mold segment 5B. Young's modulus Ea of the butting member 6 is smaller than Young's modulus Eb of the first and second inner mold segments 5A and 5B.

A pneumatic tire for resonance noise reduction, which includes a plurality of resonance noise-reducing members that are disposed along the circumferential direction of the inner liner of a tire, and are formed to protrude from the inner liner so as to reduce the interference of the resonance noises generated inside the tire. The resonance noise-reducing members are formed at an irregular interval of disposition along the circumferential direction of the inner liner. Because the resonance noise-reducing members are formed integrally with the inner liner of a tire, the resonance noise-reducing members can be prevented from falling off from the tire even during high-speed driving of the vehicle, and can reduce the resonance noises generated inside the tire by reducing the phenomenon of resonant vibration occurring inside the tire. Thus, safe driving can be realized, with reduced disturbances caused by noises made during vehicle driving.

There was a demand for: a rigid core for tire molding that is formed using lighter weight segments with sufficiently low coefficient of thermal expansion and sufficient hardness and strength instead of conventional segments that had a variety of problems; and a tire manufacturing method, which is capable of manufacturing tires with improved productivity without causing increased size of molding equipment or vulcanization equipment by using said rigid core for tire molding. A rigid core for tire molding having a core body on the outer surface of which a tire-molding surface is formed and a cylindrical core that is inserted in the central hole of the core body, the rigid core being characterized in that the core body is formed in a ring-shape by multiple core segments that are divided in the tire circumference direction and the core segments are manufactured using a carbon fiber-reinforced resin.

In an inner mold method, a pull-out force of extracting inner mold segments from a vulcanized tire is reduced. A rigid inner mold 1 is provided with an annular inner mold body 2 having a tire molding surface S. A rigid core 1 is put into a vulcanization mold B for each green tire T formed on the tire molding surface s, whereby the green tire T is vulcanization-molded between the vulcanization mold B and the inner mold body 2. The inner mold body 2 comprises a plurality of inner mold segments 5 divided in the circumferential direction. A coating layer 11 having rubber release property is formed on the tire molding surface S.

Provided is a rigid core for tire formation that limits the rubber stuck between inner mold segments in an inner mold segment while minimizing the occurrence of unevenness in the radial direction between inner mold segments that is caused by thermal expansion. A core main body 2 is divided into: a first inner mold segment 5A in which both circumferential end surfaces 5As are inclined radially inward in a direction in which the circumferential width increases; a second inner mold segment 5B that is arranged in an alternating manner with the inner mold segment 5A and in which both circumferential end surfaces 5Bs are inclined radially inward in a direction in which the circumferential width decreases; and a butting member 6 that is arranged between the first inner mold segment 5A and the second inner mold segment 5B. Young's modulus Ea of the butting member 6 is smaller than Young's modulus Eb of the first and second inner mold segments 5A and 5B.

The facility comprises a tire-building station that is configured to form an uncured tire on a core. A curing station is configured to cure the assembly formed by the core and the uncured tire so as to obtain a cured annular tire. An extraction station is configured to separate, after the curing operation, the cured tire from the core. The curing station has a first, heating, thermal source which presses against the exchange face of the core for the curing operation and is then dissociated from the core and remains in the curing station in order to leave the exchange face free again when the core and the cured tire are transferred to the extraction station so that a second, refrigerating, thermal source of the extraction station takes the place of the first thermal source in contact with the exchange face of the core so as to cool the core.