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.

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.

A method supports a tire building assembly. The method comprises the steps of: supporting one end portion of a radially collapsible building drum for assembling a green tire; moving the end portion in a first direction by an actuator acting in the first direction; and moving the end portion in a second direction by the actuator acting in the first direction.

A method supports a tire building assembly. The method comprises the steps of: supporting one end portion of a radially collapsible building drum for assembling a green tire; moving the end portion in a first direction by an actuator acting in the first direction; and moving the end portion in a second direction by the actuator acting in the first direction.

In a tire, a ribbon rubber includes a first inclining portion which inclines with respect to a tire-circumferential direction from an outside second row of a tire-width direction toward an outside first row in a winding direction; and a first parallel portion placed parallel to the tire-circumferential direction to configure the outside first row of the tire-width direction, a winding-start end of the first parallel portion being connected to a winding-finishing end of the first inclining portion, the winding-finishing end of the first parallel portion is placed closer to the winding direction than the winding-finishing end of the first inclining portion, or is placed at the same position as the winding-finishing end.

In a tire, a ribbon rubber includes a first inclining portion which inclines with respect to a tire-circumferential direction from an outside second row of a tire-width direction toward an outside first row in a winding direction; and a first parallel portion placed parallel to the tire-circumferential direction to configure the outside first row of the tire-width direction, a winding-start end of the first parallel portion being connected to a winding-finishing end of the first inclining portion, the winding-finishing end of the first parallel portion is placed closer to the winding direction than the winding-finishing end of the first inclining portion, or is placed at the same position as the winding-finishing end.

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.

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.