The tooling is suitable for manufacturing a toroidal tire that has a crown, a first annular bead and a second annular bead, together with a first sidewall and a second sidewall. The, tool has a core which is provided with groove-type passages that are suitable for receiving reinforcing elements, referred to as stays. The stays are designed to be permanently incorporated into the structure of the tire and to each extend in the cavity of the tire, thereby connecting a crown anchor point situated in the crown of the tire to a lateral anchor point situated in one of the sidewalls or beads of the tire.

The tooling is suitable for manufacturing a toroidal tire that has a crown, a first annular bead and a second annular bead, together with a first sidewall and a second sidewall. The, tool has a core which is provided with groove-type passages that are suitable for receiving reinforcing elements, referred to as stays. The stays are designed to be permanently incorporated into the structure of the tire and to each extend in the cavity of the tire, thereby connecting a crown anchor point situated in the crown of the tire to a lateral anchor point situated in one of the sidewalls or beads of the tire.

A technique for easily taking out a main body of a core mold is proposed. An annular core-mold main portion 11 having a molding surface 18 for shaping an inner surface of a pneumatic tire is included, and the core-mold main portion 11 is composed of a plurality of segments each of which is taken out toward the inside in a radial direction. In the molding surface 18 of the core-mold main portion 11, 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 positions 18e for shaping toe ends of bead portions is not less than 0.80. In an inside zone 30 from the toe-end shaping position 18e of the molding surface 18 to the position of the maximum width W, the angle of a tangent T drawn to the molding surface 18 is not more than 15 degrees. The inside zone 30 includes an oblique part 32 in which the angle 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 part 32 and a length H from the toe-end shaping position 18e to an intersecting point P of a line drawn in the tire radial direction from the toe-end shaping position 18e outwardly in the radial direction with the molding surface 18 is less than 0.25.

A technique for easily taking out a main body of a core mold is proposed. An annular core-mold main portion 11 having a molding surface 18 for shaping an inner surface of a pneumatic tire is included, and the core-mold main portion 11 is composed of a plurality of segments each of which is taken out toward the inside in a radial direction. In the molding surface 18 of the core-mold main portion 11, 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 positions 18e for shaping toe ends of bead portions is not less than 0.80. In an inside zone 30 from the toe-end shaping position 18e of the molding surface 18 to the position of the maximum width W, the angle of a tangent T drawn to the molding surface 18 is not more than 15 degrees. The inside zone 30 includes an oblique part 32 in which the angle 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 part 32 and a length H from the toe-end shaping position 18e to an intersecting point P of a line drawn in the tire radial direction from the toe-end shaping position 18e outwardly in the radial direction with the molding surface 18 is less than 0.25.

A process for manufacturing a tire by the steps of producing and assembling the tire structural elements on a toroidal support to form a green tire, and the step of precuring at least an inner surface of the green tire by heating the toroidal support. The radially inner surface of the toroidal support is provided with a plurality of protruding elements to reduce the time required for the outer surface of the toroidal support to reach a temperature which is suitable for ensuring a uniform and homogeneous precuring of the inner surface of the green tire, preferably of the inner surface and the bead regions of the green tire.

A process for manufacturing a tire by the steps of producing and assembling the tire structural elements on a toroidal support to form a green tire, and the step of precuring at least an inner surface of the green tire by heating the toroidal support. The radially inner surface of the toroidal support is provided with a plurality of protruding elements to reduce the time required for the outer surface of the toroidal support to reach a temperature which is suitable for ensuring a uniform and homogeneous precuring of the inner surface of the green tire, preferably of the inner surface and the bead regions of the green tire.

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.

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.

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.