公开(公告)号：US20210221178A1

公开(公告)日：2021-07-22

申请号：US16755296

申请日：2018-08-30

Applicant: BRIDGESTONE CORPORATION

Inventor： Takamitsu NAKAMURA ,  Yasufumi TOKITOH ,  Naoki SHIMAMURA

IPC: B60C11/03

Abstract: Provided is a motorcycle tire with improved wet grip performance while ensuring the rigidity during turning. Provided is a motorcycle tire in which: a tread portion is composed of a central rubber (11C) and a both-side rubber (11S) having a lower modulus than the central rubber; the boundary is from the tire equator to from ½ to ¾ of the half width of the peripheral length; a tire grounding portion includes a first groove, a second groove, and a third groove; a bent portion of the first groove and a bent portion of the second groove, an inner side end and an outer side end in the width direction of the second groove, an inner side end in the width direction of the third groove are located at positions from ⅛ to ⅜, from ¼ to ½, from 1/16 to 3/16, from ⅝ to ⅞, and from ½ to ⅝ of the half width of the peripheral length from the tire equator; the angles θ1, θ2, θ3, θ4, and θ5 formed by a long groove portion and a short groove portion of the first groove, an outer side groove portion and an inner side groove portion of the second groove, and the third groove with respect to the circumferential direction satisfy θ1≈θ2≈θ3≈θ5, and θ1>θ4; and a distance a between the first groove and the second groove, a distance b between the second groove and the third groove, and a distance c between the third groove and the first groove satisfy a≈b≈c.

公开(公告)号：US20150298509A1

公开(公告)日：2015-10-22

申请号：US14378401

申请日：2013-03-13

Applicant: BRIDGESTONE CORPORATION

Inventor： Naoki SHIMAMURA

IPC: B60C15/00 ,  B60C5/00 ,  B60C15/06

CPC classification number: B60C15/0009 ,  B60C5/00 ,  B60C15/06 ,  B60C15/0603 ,  B60C2001/005 ,  B60C2013/007 ,  B60C2015/009 ,  B60C2015/061 ,  B60C2015/0614 ,  B60C2015/0621 ,  B60C2015/0625

Abstract: A bead filler outer end 55a and a carcass outer end 45a are positioned to the inside of a rim flange ridge 215 in the tire radial direction trd. A rubber chafer outer end 75a is positioned to the outside of the rim flange ridge 215 in the tire radial direction trd. A soft rubber member 60 is provided between the carcass outer end 45a and a rubber chafer 70. The soft rubber member 60 has a hardness lower than those of the bead filler 50 and rubber chafer 70.

Abstract translation: 胎圈填料外端55a和胎体外端45a位于轮胎径向方向trd的轮辋凸缘215的内侧。 橡胶胎圈包布外端75a位于轮辋凸缘215的轮胎径向方向trd的外侧。 软胎橡胶构件60设置在胎体外端部45a和橡胶胎圈包布70之间。软橡胶构件60的硬度低于胎圈填料50和橡胶胎圈包布70的硬度。

公开(公告)号：US20200238765A1

公开(公告)日：2020-07-30

申请号：US16845337

申请日：2020-04-10

Applicant: BRIDGESTONE CORPORATION

Inventor： Takamitsu NAKAMURA ,  Yasufumi TOKITOH ,  Naoki SHIMAMURA

IPC: B60C11/03 ,  B60C11/13

Abstract: Provided is a motorcycle tire that further improves wet grip performance during turning while ensuring rigidity during turning. Provided is a motorcycle tire in which: a tread portion is composed of a central rubber (11C) and a both-side rubber (11S) having a lower modulus than the central rubber (11C); the both-side rubber extends from the tire equator to from ¼ to ½ of the half width of the peripheral length; on a tire grounding portion, a first groove, a second groove and a third groove are included; a first bent portion, a second bent portion and a third bent portion of the first groove, an inner side end in the width direction of the second groove, and an inner side end in the width direction and an outer side end in the width direction of the third groove are positioned at from ½ to ⅝, from 1/16 to 3/16, from 3/16 to 5/16, from ½ to ¾, from 1/16 to 3/16, and from ⅝ to ⅞, respectively, of the half width of the peripheral length from the tire equator; and angles formed by a first groove portion, a second groove portion, a third groove portion, a fourth groove portion, the second groove, a fifth groove portion, and a sixth groove portion with respect to the circumferential directions are from 35 to 45°, from 55 to 65°, from 20 to 30°, from 55 to 65°, from 55 to 65°, from 55 to 65°, and from 15 to 25°, respectively.