公开(公告)号：US20230286331A1

公开(公告)日：2023-09-14

申请号：US18112169

申请日：2023-02-21

Applicant: Sumitomo Rubber Industries, Ltd.

Inventor： You TOSHIMA

IPC: B60C15/06

CPC classification number: B60C15/0628 ,  B60C2015/065 ,  B60C2015/0678

Abstract: A pneumatic tire comprises a bead portion including a reinforcing rubber portion disposed adjacently to an axially outer side of a carcass ply. The reinforcing rubber portion includes an inner rubber layer and an outer rubber layer. The radially outer end of the outer rubber layer is positioned radially outside the radially outer end of the inner rubber layer.

公开(公告)号：US20230286325A1

公开(公告)日：2023-09-14

申请号：US18015617

申请日：2021-07-20

Applicant: SUMITOMO RUBBER INDUSTRIES, LTD.

Inventor： Masaki OSHIMO ,  You TOSHIMA

IPC: B60C11/13 ,  B60C1/00

CPC classification number: B60C11/13 ,  B60C1/00 ,  B60C2011/0341

Abstract: A tire having a tread composed of a rubber composition that includes a rubber component, wherein the tread has at least one circumferential main groove extending continuously in a tire circumferential direction, wherein, at a bending part in a plurality, the circumferential main groove bends and extends in the tire circumferential direction such that a center line of the circumferential main groove deviates in a tire width direction or an extending direction of the center line of the circumferential main groove changes preceding and following the bending part, and wherein the rubber composition has tan δ at 20° C. (20° C. tan δ) of 0.30 or less, and breaking strength TB (MPa) at 175° C. and elongation at break EB (%) at 175° C. satisfying a relational expression of TB x EB/2 ≥ 600.

公开(公告)号：US20220305850A1

公开(公告)日：2022-09-29

申请号：US17656408

申请日：2022-03-24

Applicant: Sumitomo Rubber Industries, Ltd.

Inventor： You TOSHIMA ,  Shingo Nobukuni

IPC: B60C15/06

Abstract: Provided is a pneumatic tire enabling improvement of side cut resistance and suppression of increase in mass. A pneumatic tire 1 includes: a tread portion 2; a pair of sidewall portions 3; a pair of bead portions 4 having respective bead cores 5 embedded therein; and a toroidal carcass 6 disposed between the pair of bead portions 4. The carcass 6 includes a first ply 11 extending on and between the pair of bead portions 4, and a second ply 12 disposed, in the tread portion 2, outward of the first ply 11 in a tire radial direction and extending on and between the pair of bead portions 4. The first ply 11 is formed as a layer of first cords. The second ply 12 is formed as a layer of second cords. A thickness of each second cord is 1.1 to 2.0 times a thickness of each first cord.