公开(公告)号：US20190202240A1

公开(公告)日：2019-07-04

申请号：US16323046

申请日：2017-07-27

Applicant: BRIDGESTONE CORPORATION

Inventor： Yuriko MORI

IPC: B60C9/00 ,  D07B1/06

CPC classification number: B60C9/0007 ,  B60C9/00 ,  D07B1/06 ,  D07B1/062 ,  D07B2201/2006 ,  D07B2201/203 ,  D07B2201/2051 ,  D07B2201/2061 ,  D07B2401/206 ,  D07B2401/208 ,  D07B2801/12

Abstract: Provided are: a tire steel cord having not only excellent cutting resistance and corrosion resistance but also excellent processability in plant; and a pneumatic tire including the same. The tire steel cord has a layer-twisted structure including: a core 11 composed of two core filaments 1; and a sheath 12 composed of eight sheath filaments 2 that are twisted together around the core 11, in which tire steel cord the two core filaments 1 constituting the core 11 are twisted together, the twisting direction of the core filaments 1 and that of the sheath filaments 2 are different, and a diameter (Dc) of the core filaments 1 and a diameter (Ds) of the sheath filaments 2 satisfy a relationship represented by the following Equation (1): 0.90≤Ds/Dc≤1.10  (1).

公开(公告)号：US20190176521A1

公开(公告)日：2019-06-13

申请号：US16323082

申请日：2017-07-27

Applicant: BRIDGESTONE CORPORATION

Inventor： Yuriko MORI

IPC: B60C9/00 ,  D07B1/06

Abstract: Provided is a pneumatic tire in which the crack propagation resistance of crossing belt layers is improved without deterioration of the cutting resistance and the irregular wear resistance. The pneumatic tire includes a belt composed of at least three belt layers 103 on the tire radial-direction outer side of a carcass 102, the at least three belt layers 103 including two crossing belt layers that are inclined in the opposite directions across the tire equatorial plane. In this pneumatic tire, a reinforcing material of crossing belt layers 103a and 103b is a steel cord which has a layer-twisted structure including a core composed of two core filaments and a sheath composed of eight sheath filaments that are twisted together around the core, and a steel cord amount in the crossing belt layers 103a and 103b, which is represented by the following Equation (1), is 23 to 49: Steel cord diameter (mm)×Steel cord end count (steel cords/50 mm) (1).

公开(公告)号：US20190160872A1

公开(公告)日：2019-05-30

申请号：US16323130

申请日：2017-07-27

Applicant: BRIDGESTONE CORPORATION

Inventor： Yuriko MORI

IPC: B60C9/00 ,  D07B1/06

Abstract: Provided is a pneumatic tire in which not only the cutting resistance is enhanced but also the resistance to penetration of a foreign matter is improved without deterioration of the crack propagation resistance of an outermost belt layer. The pneumatic tire is a pneumatic tire 100 including a belt composed of at least three belt layers 103 on the tire radial-direction outer side of a carcass 102. In the pneumatic tire 100, a reinforcing material of at least an outermost belt layer 103c among the at least three belt layers 103 is a steel cord which has a layer-twisted structure including a core composed of two core filaments and a sheath composed of eight sheath filaments that are twisted together around the core, and a steel cord amount in the outermost belt layer 103c, which is represented by the following Equation (1), is 37 to 49: Steel cord diameter (mm)×Steel cord end count (steel cords/50 mm) (1).