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US 6,896,836 B2Granted
Vulcanization process for pneumatic tire and mold therefor
AssigneeBridgestone Corporation
InventorsHiroo Matsunaga, Takeshi Hamachi, Miyoji Kishimoto
Life of this patent
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Abstract
A pneumatic tire comprising a tread portion, a pair of sidewall portions and a pair of bead portions is manufactured by conducting the venting in a portion of a green tire placed in a vulcanization mold prior to vulcanization and corresponding to the sidewall portion in at least one place in a radial direction of the tire during the vulcanization.
Claims15
A process for vulcanization of a pneumatic tire comprising a tread portion, a pair of sidewall portions and a pair of bead portions, comprising:
- venting a gas in a vulcanization mold received with an uncured product of the pneumatic tire at a position corresponding to the sidewall portion from a venting gap formed between two or more sub-rings of a side portion ring of the vulcanization mold in at least one location of the side portion ring in a radial direction of the tire so as to extend over a full circumference of the ring, and to extend across a full width of the side portion ring;
- wherein one of said two or more sub-rings contacts a tread ring of the vulcanization mold for forming the tread portion and another of said two or more sub-rings contacts a bead portion ring of the vulcanization mold for forming one of the bead portions.
A vulcanization mold for a pneumatic tire comprising:
- a tread ring comprised of plural segments reciprocatively displacing in a radial direction and contributing to shape a tread portion;
- a pair of side portion rings mainly contributing to shape a pair of sidewall portions, and each comprised of two or more sub-rings;
- and
- a bead portion ring contributing to shape a bead portion,
- in which a venting gap is arranged between the two or more sub-rings in at least one location of the side portion ring in the radial direction so as to extend over a full circumference of the ring and pass through the ring from the inside toward the outside thereof, and to extend across a full width of the side portion ring, wherein one of said two or more sub-rings contacts the tread ring and another of said two or more sub-rings contacts the bead portion ring.
2 more elements
A process for vulcanization of a pneumatic tire comprising a tread portion, a pair of sidewall portions and a pair of bead portions using a vulcanization mold, comprising:
- venting a gas in the vulcanization mold received with an uncured product of the pneumatic tire at a position corresponding to the sidewall portion from a venting gap formed between two or more sub-rings of a side portion ring of the vulcanization mold in at least one location of the side portion ring in a radial direction of the tire, the venting gap extending over a full circumference of the side portion ring and passing through the side portion ring from the inside toward the outside thereof,
- wherein the sub-rings are placed inward and outward in the radial direction, and opposed surfaces of the mutual sub-rings are slant faces inclining with respect to the radial direction, and at least one sub-ring among these sub-rings is energized by a spring or the like so as to enlarge the venting gap.
A vulcanization mold for a pneumatic tire comprising:
- a tread ring comprised of plural segments reciprocatively displacing in a radial direction and contributing to shape a tread portion;
- a pair of side portion rings mainly contributing to shape a pair of sidewall portions, and each comprised of two or more sub-rings;
- and
- a bead portion ring contributing to shape a bead portion,
- in which a venting gap is arranged between the two or more sub-rings in at least one location of the side portion ring in the radial direction so as to extend over a full circumference of the ring and pass through the ring from the inside toward the outside thereof,
- wherein the sub-rings are positioned inward and outward in the radial direction, and opposed surfaces of the sub-rings are slant faces inclining with respect to the radial direction, and at least one of the sub-rings is energized by a spring or the like so as to enlarge the venting gap.
3 more elements
A vulcanization mold for a pneumatic tire comprising:
- a tread ring comprised of plural segments reciprocatively displacing in a radial direction and contributing to shape a tread portion;
- a pair of side portion rings mainly contributing to shape a pair of sidewall portions, and each comprised of two or more sub-rings;
- and
- a bead portion ring contributing to shape a bead portion,
- in which a venting gap is arranged between the two or more sub-rings in at least one location of the side portion ring in the radial direction so as to extend over a full circumference of the ring and pass through the ring from the inside toward the outside thereof, and to extend across the side ring portion and open to an outside of the mold;
- wherein the sub-rings are positioned inward and outward in the radial direction, and opposed surfaces of the sub-rings are slant faces inclining with respect to the radial direction, and at least one of the sub-rings is energized by a spring or the like so as to enlarge the venting gap.
3 more elements
Dependencies are inferred from the claim text.