US 11,850,892 B2
Pneumatic tire
Koji Matsuura, Kobe (JP)
Assigned to SUMITOMO RUBBER INDUSTRIES, LTD., Kobe (JP)
Filed by Sumitomo Rubber Industries, Ltd., Kobe (JP)
Filed on Mar. 22, 2021, as Appl. No. 17/207,800.
Claims priority of application No. 2020-074290 (JP), filed on Apr. 17, 2020.
Prior Publication US 2021/0323359 A1, Oct. 21, 2021
Int. Cl. B60C 15/00 (2006.01); B60C 15/06 (2006.01)
CPC B60C 15/0628 (2013.01) [B60C 15/0036 (2013.01); B60C 2015/0685 (2013.01)] 20 Claims
OG exemplary drawing
 
10. 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.