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US 6,779,573 B2Granted
Pneumatic tires
AssigneeBridgestone Corporation
InventorsKazuomi Kobayashi, Tomohisa Nishikawa, Kenji Matsuo
Life of this patent
Estimating the term…
Abstract
A pneumatic tire having an aspect ratio of not less than 60 comprises a radial carcass of one or more plies, a belt, a bead filler rubber and a rubber reinforcing layer of substantially a crescent shape in section extending from a position near to a bead core to a position near to a tread end along an inner surface of an innermost carcass ply, wherein at least one rubber protection sheet being relatively soft is disposed between the bead filler rubber and the carcass ply surrounding it and/or between the rubber reinforcing layer and the carcass ply nearest thereto.
Claims21
A run-flat pneumatic tire comprising;
- a radial carcass extending between a pair of bead cores embedded in the respective bead portions to reinforce a pair of sidewall and a tread portion comprised of one or more rubberized cord plies,
- a belt arranged on an outer peripheral surface of the carcass to reinforce the tread portion,
- a bead filler taperingly extending from a position just above the bead core toward the end of the tread portion,
- a rubber reinforcing layer arranged at an inner surface side of an innermost carcass ply from a position near to the bead core in the bead portion near to a position near to the end of the tread portion and having substantially a crescent shape at section thereof, and
- a rubber protection sheet being softer than the rubber reinforcing layer, an entirety of said rubber protection sheet being disposed between the rubber reinforcing layer and the carcass ply nearest thereto and within a zone extending inward from a position of a line segment in parallel to the rotating axial line of the tire passing through an outer end by the bead filler rubber in the radial direction of the tire, and
- wherein the rubber protection sheet has tan δ at 25° C. of 0.04-0.11.
3 more elements
A run-flat pneumatic tire comprising:
- a radial carcass extending between a pair of bead cores embedded in the respective bead portions to reinforce a pair of sidewall portions and a tread portion comprised of one or more rubberized cord plies,
- a belt arranged on an outer peripheral surface of the carcass to reinforce the tread portion,
- a bead filler rubber taperingly extending from a position just above the bead core toward an end of the tread portion,
- a rubber reinforcing layer arranged at an inner surface side of an innermost carcass ply from a position near to the bead core in the bead portion to a position near to the end of the tread portion and having substantially a crescent shape at section thereof,
- a rubber protection sheet being softer than the rubber reinforcing layer, an entirety of said rubber protection sheet being disposed between the rubber reinforcing layer and the carcass ply nearest thereto and within a zone extending inward from a position of a line segment in parallel to the rotating axial line of the tire passing through an outer end by the bead filler rubber in the radial direction of the tire, and
- a second rubber protection sheet being softer than the bead filler rubber and disposed between the bead filler rubber and the carcass ply surrounding it.
3 more elements
A run-flat pneumatic tire comprising:
- a radial carcass extending between a pair of bead cores embedded in the respective bead portions to reinforce a pair of sidewall portions and a tread portion comprised of one or more rubberized cord plies,
- a belt arranged on an outer peripheral surface of the carcass to reinforce the tread portion,
- a bead filler rubber taperingly extending from a position just above the bead core toward an end of the tread portion,
- a rubber reinforcing layer arranged at an inner surface side of an innermost carcass ply from a position near to the bead core in the bead portion to a position near to the end of the tread portion and having substantially a crescent shape at section thereof, and
- at least one rubber protection sheet being softer than the bead filler rubber, and disposed between the bead filler rubber and the carcass ply surrounding it, within a zone extending inward from a position of a line segment in parallel to the rotating axial line of the tire passing through an outer end by the bead filler rubber in the radial direction of the tire,
- wherein the at least one rubber protection sheet has tan δ at 25° C. of 0.04-0.11.
3 more elements
A run-flat pneumatic tire comprising:
- a radial carcass extending between a pair of bead cores embedded in the respective bead portions to reinforce a pair of sidewall and a tread portion comprised of one or more rubberized cord plies,
- a belt arranged on an outer peripheral surface of the carcass to reinforce the tread portion,
- a bead filler rubber taperingly extending from a position just above the bead core toward an end of the tread portion,
- a rubber reinforcing layer arranged at an inner surface side of an innermost carcass ply from a position near to the bead core in the bead portion to a position near to the end of the tread portion and having substantially a crescent shape at section thereof, and
- a rubber protection sheet being softer than the rubber reinforcing layer and being disposed between the rubber reinforcing layer and the carcass ply nearest thereto and within a zone extending inward from a position of a line segment in parallel to the rotating axial line of the tire passing through an outer end by the bead filler rubber in the radial direction of the tire,
- wherein the rubber protection sheet has a thickness of 0.4-4.0 mm
- wherein the rubber protection sheet has tan δ at 25° C. of 0.04-0.11.
4 more elements
Dependencies are inferred from the claim text.