公开(公告)号：US20200316996A1

公开(公告)日：2020-10-08

申请号：US16303755

申请日：2017-02-22

Applicant: BRIDGESTONE CORPORATION

Inventor： Keisuke KAWASHIMA

IPC: B60C1/00 ,  B60C5/00 ,  B60C9/02 ,  C08F236/08 ,  C08F236/20 ,  C08L7/00 ,  C08K5/00 ,  C08K5/09 ,  C08K3/04 ,  C08K3/36 ,  C08L93/04 ,  C08L23/20 ,  C08L67/00 ,  C08L77/00 ,  C08L75/04

Abstract: Provided is a tire having good fuel efficiency that, even though a resin material is used therein, has improved ride comfort and dry handling performance without wet performance deterioration. The tire includes an annular tire frame (10), a reinforcement layer (20) outward of the tire frame (10) in a tire radial direction, and tread rubber (30) outward of the reinforcement layer (20) in the tire radial direction. The reinforcement layer (20) includes a reinforcement member (21) coated with a resin composition containing 50-100 mass % of a resin material. For the tread rubber (30), a storage modulus (E′0° C.) and loss tangent (tan θ0° C.) during 1% strain at 0° C. are no greater than 30 MPa and 0.5, respectively, and a value (tan δ30° C.-tan δ60° C.) obtained by subtracting a loss tangent during 1% strain at 60° C. from a loss tangent during 1% strain at 30° C. is no greater than 0.08.

公开(公告)号：US20220314699A1

公开(公告)日：2022-10-06

申请号：US17596120

申请日：2020-06-18

Applicant: BRIDGESTONE CORPORATION

Inventor： Keisuke KAWASHIMA

IPC: B60C11/03 ,  B60C11/00

Abstract: Provided is a tire having excellent rolling resistance and improved pass-by noise performance. A tire comprises a tread portion that includes a base rubber and a cap rubber located on an outer side of the base rubber in a tire radial direction, wherein a thickness of the base rubber in the tire radial direction is 1 mm or more, 30° C. tan δ of the base rubber is 0.20 or less, and a ratio 0° C. tan δ/30° C. tan δ of 0° C. tan δ to 30° C. tan δ of the base rubber is 2.90 or more, where the 30° C. tan δ is tan δ at 10 Hz and 30° C., and the 0° C. tan δ is tan δ at 10 Hz and 0° C.

公开(公告)号：US20220016929A1

公开(公告)日：2022-01-20

申请号：US17312730

申请日：2019-12-13

Applicant: BRIDGESTONE CORPORATION

Inventor： Yoshiki NAKATA ,  Keisuke KAWASHIMA ,  Kohei SUZUKI

IPC: B60C3/04 ,  B60C11/03

Abstract: An outer diameter of the pneumatic tire is 350 mm or more and 600 mm or less, and as RW is defined by a rim width of a rim wheel assembled to the pneumatic tire and SW is defined by a tire width of the pneumatic tire, the relation of 0.78≤RW/SW≤0.99 is satisfied, and at least two circumferential main grooves extending to the tire circumferential direction are formed in the tread. The circumferential main groove is formed closer to a tire equatorial line than an outer end in the tire width direction of the belt layer.

公开(公告)号：US20220055407A1

公开(公告)日：2022-02-24

申请号：US17312876

申请日：2019-12-12

Applicant: BRIDGESTONE CORPORATION

Inventor： Kohei SUZUKI ,  Masayuki HASHIMOTO ,  Keisuke KAWASHIMA

IPC: B60C3/04

Abstract: OD is defined by an outer diameter of the pneumatic tire, RW is defined by a rim width of a rim wheel assembled to the pneumatic tire, SW is defined by a tire width of the pneumatic tire, and RD is defined by a rim diameter of the pneumatic tire, the OD is 350 mm or more and 600 mm or less, the relation of 0.78≤RW/SW≤0.99; and the relation of 0.56≤RD/OD≤0.75 are satisfied.

公开(公告)号：US20190276647A1

公开(公告)日：2019-09-12

申请号：US16302915

申请日：2017-02-22

Applicant: BRIDGESTONE CORPORATION

Inventor： Keisuke KAWASHIMA

IPC: C08L7/00 ,  C08L9/06 ,  C08K5/31 ,  C08K5/47 ,  B60C5/01 ,  B60C1/00

Abstract: Provided is a tire that has excellent high-speed durability even though a resin material is used therein. The tire includes a tire frame (10) having an annular shape, a reinforcement layer (20) located outward of the tire frame (10) in a tire radial direction, and tread rubber (30) located outward of the reinforcement layer (20) in the tire radial direction. The reinforcement layer (20) includes a reinforcement member (21) that is coated with a resin composition containing from 50 mass % to 100 mass % of a resin material. The tread rubber (30) has a loss tangent (tan δ60° C.) during 1% strain at 60° C. and a storage modulus (E′30° C. (MPa)) during 1% strain at 30° C. that satisfy a relationship in a formula: 27.5×tan δ60° C.+1.125≤E′30° C.≤27.5×tan δ60° C.+11.25.

公开(公告)号：US20220314698A1

公开(公告)日：2022-10-06

申请号：US17596031

申请日：2020-06-18

Applicant: BRIDGESTONE CORPORATION

Inventor： Keisuke KAWASHIMA

IPC: B60C11/00 ,  B60C11/03

Abstract: Provided is a tire having excellent rolling resistance and improved pass-by noise performance. The tire is a pneumatic tire comprising a side rubber provided on an outer side of a carcass in a tire width direction, in a sidewall portion, wherein a thickness of the side rubber in the tire width direction at a tire maximum width position is 1 mm or more, and a ratio 0° C. tan δ/30° C. tan δ of 0° C. tan δ to 30° C. tan δ of the side rubber is 2.00 or more, where the 0° C. tan δ is tan δ at 10 Hz and 0° C., and the 30° C. tan δ is tan δ at 10 Hz and 30° C.

公开(公告)号：US20220024261A1

公开(公告)日：2022-01-27

申请号：US17296309

申请日：2019-11-27

Applicant: BRIDGESTONE CORPORATION

Inventor： Keisuke KAWASHIMA

IPC: B60C19/00 ,  B60C11/04 ,  B60C11/03 ,  B60C11/12

Abstract: A tire including a land part partitioned between two main grooves extending in the tire circumferential direction S of the tire and resonators formed in the land part. A resonator has a cavity part separated from the two main grooves and is opened at the surface of the land part, a 1st sipe that is opened at one main groove and the cavity part, and a 2nd sipe that is opened at the other main groove and the cavity part. Depths of the main grooves are 3 mm or more and 6.5 mm or less. A volume value of the cavity part is more than 3 times or more and 5 times or less a sum of the cross-sectional areas of the two main grooves with the land part in between, and lengths of the 1st sipe and the 2nd sipe are 10 mm or more and 25 mm or less.