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US 11,850,892 B2Granted
Pneumatic tire
AssigneeSumitomo Rubber Industries, Ltd.
InventorKoji Matsuura
Life of this patent
Estimating the term…
Abstract
A pneumatic tire comprises a carcass, a bead apex rubber, and a bead reinforcing cord layer. The bead apex rubber has a radially outer edge positioned at a radial height of 15% to 25% of the tire section height. The bead reinforcing cord layer comprises an axially inner first part disposed on the axially outside of a carcass ply main portion, and an axially outer second part disposed on the axially inside of a carcass ply turned-up portion. The radially outer edge of the axially outer second part is radially outwardly spaced apart from the radially outer edge of the carcass ply turned-up portion by at least 5 mm.
Claims20
A pneumatic tire comprising:
- a pair of bead portions with a bead core embedded therein,
- a carcass extending between the pair of bead portions, and
- a bead apex rubber disposed in each of the bead portions and extending radially outwardly from the bead core therein, and
- a bead reinforcing cord layer disposed in each of the bead portions and composed of a ply of cords,
- wherein
- the carcass comprises
- a first carcass ply extending between the bead portions and turned up around the bead core in each of the bead portions from the axially inside to the axially outside so as to have a pair of turned-up portions and a main portion therebetween, and
- a second carcass ply disposed outside the first carcass ply and extending between the bead portions without being turned up around the respective bead cores so as to have radially inner edges terminated axially outside the respective bead cores,
- the bead apex rubber has a radially outer edge at a radial height of from 15% to 25% of a tire section height, each height measured radially outwardly from the bead base line,
- the bead reinforcing cord layer comprises
- an axially inner first part disposed on the axially outside of the main portion of the first carcass ply, and
- an axially outer second part disposed on the axially inside of the turned-up portion of the first carcass ply and extending from the axially inner first part through a radially inner side of the bead core, and
- the axially outer second part has a radially outer edge which is radially outwardly spaced apart from the radially outer edge of the turned-up portion by at least 5 mm in a radial direction of the tire,
- wherein
- each of the bead portions is provided with an axially outer rubber layer disposed axially outside the turned-up portion and axially inside the second carcass ply, and
- each sidewall portion of the tire is provided with a sidewall rubber disposed on the axially outside of the second carcass ply.
13 more elements
A pneumatic tire comprising:
- a pair of bead portions with a bead core embedded therein,
- a carcass extending between the pair of bead portions, and
- a bead apex rubber disposed in each of the bead portions and extending radially outwardly from the bead core therein, and
- a bead reinforcing cord layer disposed in each of the bead portions and composed of a ply of cords,
- wherein
- the carcass comprises
- a first carcass ply extending between the bead portions and turned up around the bead core in each of the bead portions from the axially inside to the axially outside so as to have a pair of turned-up portions and a main portion therebetween, and
- a second carcass ply disposed inside the first carcass ply and extending between the bead portions and turned up around the bead core in each of the bead portions from the axially inside to the axially outside so as to have a pair of turned-up portions and a main portion therebetween,
- the bead apex rubber has a radially outer edge at a radial height of from 15% to 25% of a tire section height, each height measured radially outwardly from the bead base line,
- the bead reinforcing cord layer comprises
- an axially inner first part disposed on the axially outside of the main portion of the first carcass ply, and
- an axially outer second part disposed on the axially inside of the turned-up portion of the first carcass ply and extending from the axially inner first part through a radially inner side of the bead core, and
- the axially outer second part has a radially outer edge which is radially outwardly spaced apart from the radially outer edge of the turned-up portion by at least 5 mm in a radial direction of the tire,
- wherein
- each of the bead portions is provided with an axially outer rubber layer disposed axially outside the turned-up portion of the first carcass ply and axially inside the turned-up portion of the second carcass ply, and
- each sidewall portion of the tire is provided with a sidewall rubber disposed on the axially outside of the turned-up portion of the second carcass ply.
13 more elements
Dependencies are inferred from the claim text.