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    MOTORCYCLE TIRE
    1.
    发明申请
    MOTORCYCLE TIRE 审中-公开

    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.

    MOTORCYCLE TIRE
    2.
    发明申请
    MOTORCYCLE TIRE 有权

    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.

    PNEUMATIC TIRE FOR TWO-WHEELED MOTOR VEHICLES
    4.
    发明申请
    PNEUMATIC TIRE FOR TWO-WHEELED MOTOR VEHICLES 审中-公开

    公开(公告)号：US20190322139A1

    公开(公告)日：2019-10-24

    申请号：US16502121

    申请日：2019-07-03

    Applicant: Bridgestone Corporation

    Inventor： Yasufumi TOKITOH

    IPC: B60C9/06 ,  B60C15/04 ,  B60C15/06

    Abstract: Provided is a pneumatic tire for two-wheeled motor vehicles in which the durability of bead portions is improved than in conventional tires. This pneumatic tire includes: a tread portion formed in an annular shape; side wall portions and bead portions, which continuously extend on the respective ends of the tread portion; a carcass 1 composed of at least three layers of carcass plies 1a, 1b and 1c which toroidally extend on the tire radial-direction inner side of the tread portion; a belt 2 composed of at least two belt layers 2a and 2b which are arranged on the tire radial-direction outer side of the carcass 1; and bead cores 3 embedded in the bead portions. In this pneumatic tire, the carcass plies 1a, 1b and 1c; have a bias structure and include at least two layers of turn-up carcass plies 1a and 1b which are folded back around the bead cores 3, and at least one layer of down carcass ply 1c which is arranged on the tire radial-direction outer side of the turn-up carcass plies and terminated on the tire width-direction outer side of the bead portions without being folded back around the bead cores 3.

    TWO-WHEELED VEHICLE TIRE
    6.
    发明申请
    TWO-WHEELED VEHICLE TIRE 有权

    公开(公告)号：US20210138840A1

    公开(公告)日：2021-05-13

    申请号：US17041029

    申请日：2019-02-19

    Applicant: BRIDGESTONE CORPORATION

    Inventor： Tomoyuki WAKABAYASHI ,  Yasufumi TOKITOH

    IPC: B60C11/03 ,  B60C11/11

    Abstract: A two-wheeled vehicle tire achieves a further improvement particularly in the traction performance during turning on soft ground. A two-wheeled vehicle tire includes a tread portion formed in an annular shape. The tread portion includes: center land portions arranged on a tire equator CL; middle land portions arranged on the tire width-direction outer side of the center land portions; and shoulder land portions arranged on the tire width-direction outer side of the middle land portions, and T-shaped or Y-shaped land portions each constituted by three partial land portions connected at one end are arranged between the center land portions and the shoulder land portions.

    MOTORCYCLE TIRE AND TIRE SET
    7.
    发明申请
    MOTORCYCLE TIRE AND TIRE SET 审中-公开

    公开(公告)号：US20180326791A1

    公开(公告)日：2018-11-15

    申请号：US15515613

    申请日：2015-08-10

    Applicant: BRIDGESTONE CORPORATION

    Inventor： Shintaro HAYASHI ,  Yasufumi TOKITOH

    IPC: B60C11/03

    CPC classification number: B60C11/0304 ,  B60C5/00 ,  B60C11/03 ,  B60C2011/0372 ,  B60C2011/0381 ,  B60C2200/10

    Abstract: A tire used for the motorcycle tire and tire set includes: a crossing groove and a non-crossing groove. A groove group of the crossing groove and the non-crossing groove is repeatedly provided in tire circumferential direction so that adjacent groove groups are symmetric with respect to a tire equatorial plane. First, second, and fifth groove portions extend toward one side in tire circumferential direction and third and fourth groove portions extend toward the other side in tire circumferential direction. A first bend portion is located in a shoulder region nearer the one tread edge, a second bend portion is located in a middle region nearer the one tread edge, and a third bend portion is located in a middle region nearer the other tread edge. Inclination angles of the second, fourth and fifth groove portions are each larger than an inclination angle of the first groove portion.

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