公开(公告)号：DE69735064T2

公开(公告)日：2006-07-20

申请号：DE69735064

申请日：1997-09-25

Applicant: BRIDGESTONE CORP

Inventor： ONUMA SHUICHI ,  OBANA NAOHIKO ,  KUSABA NOBORU

IPC: D07B1/06 ,  B60C9/00 ,  B60C9/20 ,  D07B7/02

Abstract: Steel cord used as a reinforcement for a belt layer in pneumatic tires. The steel cord is manufactured by: forming a plurality of bends, per filament length equivalent to one twist pitch, on each of filaments which constitute an outer layer sheath, with the filament length equivalent to one twist pitch being a cycle; twisting these filaments while the bends belonging to the same phase are aligned in a cord axial direction; and subjecting cord side surfaces to compression processing. As a result, flat side surface portions are formed, in which a plurality of filaments forming the outer layer sheath are positioned substantially in the same plane. The steel cord thus formed is used in reinforcement plies for pneumatic radial tires such that the reinforcement plies are laminated in a manner in which the flat side surface portions are mutually parallel. Accordingly, the distribution of shearing stress acting on rubber between the flat side surface portions of the steel cord is made uniform and rigidity of a tire per amount of steel cord used is enhanced. Therefore, it is possible to reduce a weight of the steel cord used per tire, and by mounting such pneumatic radial tires on a vehicle, to improve fuel efficiency.

公开(公告)号：DE69735064D1

公开(公告)日：2006-03-30

申请号：DE69735064

申请日：1997-09-25

Applicant: BRIDGESTONE CORP

Inventor： ONUMA SHUICHI ,  OBANA NAOHIKO ,  KUSABA NOBORU

IPC: D07B1/06 ,  B60C9/00 ,  B60C9/20 ,  D07B7/02

Abstract: Steel cord used as a reinforcement for a belt layer in pneumatic tires. The steel cord is manufactured by: forming a plurality of bends, per filament length equivalent to one twist pitch, on each of filaments which constitute an outer layer sheath, with the filament length equivalent to one twist pitch being a cycle; twisting these filaments while the bends belonging to the same phase are aligned in a cord axial direction; and subjecting cord side surfaces to compression processing. As a result, flat side surface portions are formed, in which a plurality of filaments forming the outer layer sheath are positioned substantially in the same plane. The steel cord thus formed is used in reinforcement plies for pneumatic radial tires such that the reinforcement plies are laminated in a manner in which the flat side surface portions are mutually parallel. Accordingly, the distribution of shearing stress acting on rubber between the flat side surface portions of the steel cord is made uniform and rigidity of a tire per amount of steel cord used is enhanced. Therefore, it is possible to reduce a weight of the steel cord used per tire, and by mounting such pneumatic radial tires on a vehicle, to improve fuel efficiency.

公开(公告)号：EP1041194A4

公开(公告)日：2002-07-31

申请号：EP97941234

申请日：1997-09-25

Applicant: BRIDGESTONE CORP

Inventor： ONUMA SHUICHI ,  OBANA NAOHIKO ,  KUSABA NOBORU

IPC: B60C9/00 ,  B60C9/20 ,  D07B1/06 ,  D07B7/02

CPC classification number: D07B1/062 ,  B60C9/0007 ,  B60C9/2006 ,  D07B7/025 ,  D07B2201/2016 ,  D07B2201/2023 ,  Y10S57/902

Abstract: Steel cord used as a reinforcement for a belt layer in pneumatic tires. The steel cord is manufactured by forming a plurality of bends per strand length equivalent to one twist pitch on a strand, which constitutes an outer layer sheath, with the strand length equivalent to one twist pitch being a cycle, twisting these strands while the bends belonging to the same phase are aligned in a cord axial direction, and subjecting cord side surfaces to compression processing. As a result, flat side surface portions are formed, in which a plurality of strands forming the outer layer sheath are positioned substantially in the same plane. The steel cord thus formed is used in reinforcement plies for pneumatic radial tires such that the reinforcement plies are laminated so that the flat side surface portions are mutually parallel. Accordingly, the distribution of shearing stress acting on rubber between the flat side surface portions of the steel cord is made uniform and rigidity of a tire per amount of steel cord used is enhanced. Therefore, it is possible to reduce a weight of the steel cord used per tire and improve fuel efficiency by mounting such pneumatic radial tires on a vehicle.

公开(公告)号：JP2005048326A

公开(公告)日：2005-02-24

申请号：JP2003281899

申请日：2003-07-29

Applicant: Bridgestone Corp ,  株式会社ブリヂストン

Inventor： KUSABA NOBORU

IPC: D07B1/06 ,  B60C9/00 ,  B60C9/20

CPC classification number: D07B1/062 ,  D07B5/005 ,  D07B2201/2018 ,  D07B2201/2021 ,  D07B2201/2022

Abstract: PROBLEM TO BE SOLVED: To provide a pneumatic tire in which it is prevented that water is spread from flaw into the interior when a tread part suffer an external flaw such as cut flaw and development of crack from belt end is suppressed and durability is enhanced. SOLUTION: The pneumatic tire 7 is equipped with a belt 13 obtained by covering a plurality of reinforcing elements 12 parallel arranged over both width ends 11 with rubber on the outer periphery of a crown part 10 of a carcass 9. Each reinforcing element 12 is an open cord and a profile shape P3 of a virtual cross section perpendicular to the extending direction is changed along the extending direction between nearly circle and nearly ellipse in which the short axis extends to the thickness direction of the belt. When the diameter of the reinforcing element in the thickness direction of the belt 13 is defined as a vertical diameter (a) and the diameter of the reinforcing element in the direction perpendicular to the thickness direction of the belt 13 is defined as a transverse diameter (b) and a ratio (a/b) of the vertical diameter (a) to the transverse diameter (b) is defined as a flat ratio and the reinforcing element 12 is divided into both ends 15 and a central part 16, in the both ends 15, maximum value of the transverse diameter (b) is smaller and minimum value of a flat ratio (a/b) is larger, compared with the central part 16. COPYRIGHT: (C)2005,JPO&NCIPI

Abstract translation: 要解决的问题：提供一种充气轮胎，其中当胎面部遭受诸如切割缺陷的外部缺陷时，防止水从缺陷蔓延到内部，并且抑制了从皮带端部开始的裂纹和耐久性 增强了。 解决方案：充气轮胎7配备有通过在胎体9的胎冠部10的外周上用橡胶覆盖在两个宽度端部11上平行布置的多个加强元件12而获得的带13.每个增强元件 12是开放的线，并且与延伸方向垂直的虚拟横截面的轮廓形状P3沿着短轴延伸到带的厚度方向的近似圆形和近似椭圆之间的延伸方向改变。 当加强元件在带13的厚度方向上的直径被定义为垂直直径（a），并且加强元件在与带13的厚度方向垂直的方向上的直径被定义为横向直径（ b）和垂直直径（a）与横向直径（b）的比率（a / b）被定义为平坦比率，并且加强元件12被分为两端15和中心部分16 端部15，与中央部分16相比，横向直径（b）的最大值较小，平坦比（a / b）的最小值较大。（C）2005年，JPO和NCIPI

公开(公告)号：JP2002309491A

公开(公告)日：2002-10-23

申请号：JP2001116079

申请日：2001-04-13

Applicant: BRIDGESTONE CORP

Inventor： KUSABA NOBORU

IPC: D07B7/02 ,  D07B1/06

Abstract: PROBLEM TO BE SOLVED: To provide a method for producing steel cord which is used for reinforcing a rubber product, such as a pneumatic tire and a conveyor belt. SOLUTION: This method for producing the steel cord comprises giving fixation to plural strands with a forming unit (6), passing the strands through guides (6A, 6B, 6C), gathering the strands at the outlet of the guides, and twining the strands with a die (7), wherein an outer guide (6B) inward facing to the center of the strands and inner guides (6A, 6C) are arranged in a space from the fixation-giving unit to the die in such a manner that intervals between the outer and inner guides correspond to a half of the twining pitch, and peripheral edges of the guides contacting with the strands are inclined in such a manner that the edges each have a inclination corresponding to the fixation- given screwed strands, so that phases for giving the fixation to the strands are made to be shifted from each other and the strands are sequentially contacted with the outer peripheral edge of the inner guide (6A), the inner peripheral edge of the outer guide (6B), and the outer peripheral edge of the inner guide (6C). The guides are usually arranged so that their intervals correspond to a half of or similar to the twining pitch. The cord thus produced has stabilized cord quality.

公开(公告)号：JP2001055676A

公开(公告)日：2001-02-27

申请号：JP22728899

申请日：1999-08-11

Applicant: BRIDGESTONE CORP

Inventor： KUSABA NOBORU

IPC: D07B1/06 ,  B60C9/00 ,  B60C9/20

Abstract: PROBLEM TO BE SOLVED: To obtain a steel cord excellent in rubber-permeability and useful for reinforcing a belt part of a tire by twisting plural wires shaped at a prescribed amplitude at the same pitch as that at the shaping. SOLUTION: A wire 2 having 0.15-0.40 mm wire diameter d is shaped into a two-dimensional wave shape at an amplitude within the range of 2d-5d, and three to five shaped wires 2 are twisted at the same pitch Pc of 6-30 mm as that at the shaping so that the position of the neighboring wire 2 may be changed from the upper part to the lower part in order to provide the objective steel cord 1. The length of the major axis (a) in the cross section of the cord is nearly equal to the amplitude at the shaping of the wire 2, and the length of the minor axis b is nearly equal to the stack of two wires 2 in the steel cord 1 having flat cross section.