Patent ID: 7431577

Claim:
A die for manufacturing a core including: a ring-shaped supporting member that is formed by a plate-like member, that is disposed inside a pneumatic tire, and that supports the pneumatic tire by allowing an inner side of a tire tread portion to be brought into contact with an outer peripheral surface of the supporting member at the time of a deformation of the pneumatic tire due to a decrease of an internal pressure of the tire; and ring-shaped rubber portions that are respectively joined to both widthwise direction edge portions of the supporting member, the die comprising: a ring-shaped core die that is brought into contact with the supporting member from radial inner side directions thereof to support the supporting member while maintaining a non-contact state with the both widthwise direction edge portions of the supporting member; first and second transfer-molding dies that are disposed so as to hold the core die therebetween from the core die axial direction and form cavities between the first transfer-molding die and the core die as well as between the second transfer-molding die and the core die, the cavities being used for forming the rubber portions respectively at one edge portion and the other edge portion of the supporting member; and a transfer part that injects a rubber material into runners that are respectively formed at the first and second transfer-molding dies and simultaneously transfers the rubber material into the cavities, wherein the rubber material injected into the cavities is vulcanized and molded.