Tire vulcanizing mold, tire manufacturing method, and tire
AssigneeBridgestone Corporation
InventorMasatomo OSHIMA
Life of this patent
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Abstract
A tire vulcanizing mold for molding an unvulcanized tire into a pneumatic tire having a bead part with a bead heel part is provided with a side part ring for molding at least the bead part. A circumferential groove part extending in the tire circumferential direction is formed on a tire molding surface of the side part ring in a heel molding region for molding the bead heel part, the side part ring is divided into a side ring and a bead ring that abuts against the side ring, the division position of the tire molding surface of the side ring and the tire molding surface of the bead ring is located in the groove bottom of the circumferential groove part, and the cross-sectional shape of the circumferential groove part tapers toward the groove bottom.
Claims11
A tire vulcanizing mold configured to mold a tire provided with a bead part having a bead heel part from an unvulcanized tire formed as an unvulcanized pneumatic tire, comprising a side part ring which molds at least the bead part, wherein
- one circumferential direction groove part recessed toward an outer side in a tire width direction and extending in a tire circumferential direction is formed in a heel molding region, which molds the bead heel part, of a tire molding surface of the side part ring,
- the side part ring is divided into a side ring arranged at an outer side in a tire radial direction and a bead ring arranged at an inner side of the side ring in the tire radial direction and contacted with the side ring,
- a dividing position between a tire molding surface of the side ring and a tire molding surface of the bead ring is arranged on a groove bottom of the one circumferential direction groove part, and
- a cross-sectional shape of the one circumferential direction groove part is formed in a tapered shape in which a groove width becomes smaller toward the groove bottom.
A tire manufacturing method which manufactures a tire by using a tire vulcanizing mold, comprising:
- arranging an unvulcanized tire formed as an unvulcanized pneumatic tire in the tire vulcanizing mold, and
- molding the tire by vulcanizing the unvulcanized tire arranged in the tire vulcanizing mold, wherein
- the tire vulcanizing mold comprises a side part ring which molds at least the bead part,
- a one circumferential direction groove part recessed toward an outer side in a tire width direction and extending in a tire circumferential direction is formed in a heel molding region, which molds the bead heel part, of a tire molding surface of the side part ring,
- the side part ring is divided into a side ring arranged at an outer side in a tire radial direction and a bead ring arranged at an inner side of the side ring in the tire radial direction and contacted with the side ring,
- a dividing position between a tire molding surface of the side ring and a tire molding surface of the bead ring is arranged on a groove bottom of the one circumferential direction groove part, and
- a cross-sectional shape of the one circumferential direction groove part is formed in a tapered shape in which a groove width becomes smaller toward the groove bottom.
A tire comprising a bead part provided with a bead heel part, wherein
- the bead heel part has one circumferential direction projection part protruded toward an outer side in a tire width direction and extending in a tire circumferential direction, and
- a cross-sectional shape of the one circumferential direction projection part is formed in a tapered shape in which a width of the one circumferential direction projection part becomes smaller toward a distal end of the one circumferential direction projection part.
Dependencies are inferred from the claim text.