公开(公告)号：US20230150313A1

公开(公告)日：2023-05-18

申请号：US17989704

申请日：2022-11-18

Applicant: Sumitomo Rubber Industries, Ltd.

Inventor： Takashi SUGIURA

IPC: B60C11/03

CPC classification number: B60C11/0306 ,  B60C2200/06 ,  B60C2011/0355 ,  B60C2011/0358 ,  B60C2011/0353 ,  B60C2011/1213

Abstract: In a tire meridian cross-section in a 5% internal pressure state of a heavy duty tire, a first radius of curvature of a first ground-contact surface profile of each of a center land portion, an inner region of a first middle block, an outer region of the first middle block, and a first shoulder block can be defined. In addition, a ratio (Wa/Da) of a groove width Wa to a groove depth Da of a center circumferential groove may not be larger than 0.25. Furthermore, a ratio (Lb/La) of a maximum length Lb in a tire axial direction to a maximum length La in a tire circumferential direction in the first middle block can be defined.

公开(公告)号：US20220001697A1

公开(公告)日：2022-01-06

申请号：US17366261

申请日：2021-07-02

Applicant: SUMITOMO RUBBER INDUSTRIES, LTD.

Inventor： Takashi SUGIURA

IPC: B60C11/00 ,  B60C11/12 ,  B60C11/03

Abstract: A tire has a tread portion divided into a crown land region, shoulder land regions, and middle land regions. The crown land region comprises a crown axial central portion. The middle land region comprises a middle axial inner portion and a middle axial outer portion. The shoulder land region comprises a shoulder axial inner portion and a shoulder axial central portion. The radius Rmi of curvature of the middle axial inner portion is 0.80 to 1.20 times the radius Rcc of curvature of the crown axial central portion. The radius Rsc of curvature of shoulder axial central portion is 0.80 to 1.20 times the radius Rmo of curvature of middle axial outer portion. The radii Rsc and Rmo are less than the radii Rcc and Rmi. The radius Rsi of the shoulder axial inner portion is less than the radii Rsc and Rmo.

公开(公告)号：US20240100887A1

公开(公告)日：2024-03-28

申请号：US18373287

申请日：2023-09-27

Applicant: Sumitomo Rubber Industries, Ltd.

Inventor： Takashi SUGIURA

IPC: B60C11/13 ,  B60C11/12

CPC classification number: B60C11/1369 ,  B60C11/1204 ,  B60C11/1236 ,  B60C11/1259 ,  B60C2011/0346

Abstract: A heavy duty tire can have a tread portion that includes a plurality of circumferential grooves that zigzag, a plurality of lateral grooves connecting between zigzag vertexes of the circumferential grooves, and a plurality of hexagonal blocks formed by the circumferential grooves and the lateral grooves. A groove depth of the circumferential groove can be 21 mm or more. Each of the hexagonal blocks can include a three-dimensional sipe extending across the hexagonal block. The lateral groove can include a raised portion formed by raising a groove bottom of the lateral groove to connect between the hexagonal blocks adjacent to each other in the tire circumferential direction.