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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
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.
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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
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.
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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
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.
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Patent Agency Ranking
公开(公告)号：EP1714801A4
公开(公告)日：2008-12-31
申请号：EP05709868
申请日：2005-02-08
Applicant: BRIDGESTONE CORP
Inventor： ONUMA SHUICHI , SUZUKI TORU
IPC: B60C11/00
CPC classification number: B60C11/00 , B60C11/005 , B60C11/0075 , B60C2200/02
Abstract: A pneumatic tire for aircraft capable of increasing the number of landings for each tread by preventing the durability against heating of a top tread from being deteriorated when the depth of a groove is increased. The top tread (2) comprises a double layer structure formed by stacking a base tread layer (11) and a cap tread layer (12) in that order from the inner surface side at least partly in the lateral direction of the tire. At least one of peripheral grooves (4a) to (4d) is formed in the surface of the top tread (2), and the base tread layer (11) and the cap tread layer (12) fulfill requirements expressed by the following expressions (1) and (2). 1.05
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公开(公告)号：DE60027641T2
公开(公告)日：2007-05-03
申请号：DE60027641
申请日：2000-06-21
Applicant: BRIDGESTONE CORP
Inventor： ONUMA SHUICHI , OBANA NAOHIKO , YOSHIDA CHIHIRO
IPC: D07B1/06
Abstract: A steel cord (1) comprising a core (3) formed by bundling three or more filaments (2) side by side without twisting and a sheath (5) of at least one layer comprised of plural filaments (4) wound around the core, characterized in that an arrangement of the filaments (2) constituting the core (3) at a section perpendicular to a longitudinal direction of the core differs between at least a part in the longitudinal direction of the core and the other part thereof, and all filaments (2) constituting the core (3) in all section parts are arranged in a rectangle having a long side of d x (n+1) and a short side of d x (1+1/2 ) when the diameter of the filament is d and the number of the filaments in the core is n. Such steel cords are used in a belt of a pneumatic tire. Also, these cords are produced by a tubular-type twisting machine having a specified structure.
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公开(公告)号：ES2262487T3
公开(公告)日：2006-12-01
申请号：ES00305258
申请日：2000-06-21
Applicant: BRIDGESTONE CORP
Inventor： ONUMA SHUICHI , OBANA NAOHIKO , YOSHIDA CHIHIRO
IPC: D07B1/06
Abstract: Hilo de acero (1) que comprende un alma (3) que es formada reuniendo en forma de manojo tres o más filamentos (2) lado a lado sin retorsión y un revestimiento (5) de al menos una capa que consta de una pluralidad de filamentos (4) arrollados en torno al alma; estando dicho hilo de acero caracterizado por el hecho de que la disposición de los filamentos (2) que constituyen el alma (3) es desordenada y están mezcladas en la dirección longitudinal del alma distintas secciones transversales en la disposición relativa de los filamentos de forma tal que todos los filamentos (2) que constituyen el alma (3) en todas partes en sección están dispuestos en un rectángulo que tiene un lado mayor de no más de d x (n+1) y un lado menor de no más de d x (1+1/2) cuando el diámetro del filamento es d y el número de filamentos del alma es n.
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公开(公告)号：DE60027641D1
公开(公告)日：2006-06-08
申请号：DE60027641
申请日：2000-06-21
Applicant: BRIDGESTONE CORP
Inventor： ONUMA SHUICHI , OBANA NAOHIKO , YOSHIDA CHIHIRO
IPC: D07B1/06
Abstract: A steel cord (1) comprising a core (3) formed by bundling three or more filaments (2) side by side without twisting and a sheath (5) of at least one layer comprised of plural filaments (4) wound around the core, characterized in that an arrangement of the filaments (2) constituting the core (3) at a section perpendicular to a longitudinal direction of the core differs between at least a part in the longitudinal direction of the core and the other part thereof, and all filaments (2) constituting the core (3) in all section parts are arranged in a rectangle having a long side of d x (n+1) and a short side of d x (1+1/2 ) when the diameter of the filament is d and the number of the filaments in the core is n. Such steel cords are used in a belt of a pneumatic tire. Also, these cords are produced by a tubular-type twisting machine having a specified structure.
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公开(公告)号：JPH07189141A
公开(公告)日：1995-07-25
申请号：JP32873793
申请日：1993-12-24
Applicant: BRIDGESTONE METALPHA CORP , BRIDGESTONE CORP
Inventor： ONUMA SHUICHI , OBANA NAOHIKO , FUJITA KAZUTO , BUNDO MOTONORI
Abstract: PURPOSE:To obtain a steel cord remarkably different in flexural rigidity between both the directions mutually crossing in the cross section of the cord and capable of producing a tire belt having a high in-plane flexural rigidity and a low out-plane flexural rigidity without especially using a filament having a large diameter or having an oval cross section as the belt material. CONSTITUTION:This steel cord is produced by intertwisting three or more steel filaments to obtain a strand, arranging plural number of the resultant strands in one plane in a state in which they are in contact with each other to form a bundle and spirally winding a wrapping filament around the bundle.
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