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    PNEUMATIC TIRE
    222.
    发明授权
    PNEUMATIC TIRE 有权

    公开(公告)号：EP2639082B1

    公开(公告)日：2018-06-06

    申请号：EP11840239.5

    申请日：2011-11-08

    Applicant: Bridgestone Corporation

    Inventor： KITAHARA Kouta

    IPC: D02G3/48 ,  B60C9/20 ,  D07B1/06 ,  B60C9/00

    CPC classification number: B60C9/0007 ,  B60C9/2006 ,  B60C9/28 ,  D07B1/062 ,  D07B1/0626 ,  D07B2201/2006 ,  D07B2201/2018 ,  D07B2201/2023 ,  D07B2201/2029 ,  D07B2201/2051 ,  D07B2201/206 ,  D07B2801/12

    Abstract: To provide a pneumatic tire wherein the lightweight properties of a tire is secured while improving the plunger energy and BES resistance thereof, which is particularly suitable for tires for a large passenger car or extra load tires. A pneumatic tire comprising a carcass 1 as a skeleton, and at least two belt layers 2a, 2b each formed by rubberizing a plurality of steel cords arranged obliquely with respect to the tire circumferential direction on the outside in the tire radial direction of the crown portion of the carcass is provided. The steel cord is composed of two or more core wires and five to seven sheath wires twisted together around the core wires; the interval between adjacent steel cords in the belt layer is more than 1.0 mm and not more than 1.50 mm; and the gauge of the belt layer is not less than 1.20 mm and not more than 1.60 mm.

    STEEL CORD, COMPOSITE OF RUBBER AND STEEL CORD, AND TIRE
    230.
    发明公开
    STEEL CORD, COMPOSITE OF RUBBER AND STEEL CORD, AND TIRE 审中-公开
    STAHLKORD，VERBUND AUS GUMMI UND STAHLKORD SOWIE REIFEN

    公开(公告)号：EP2065512A1

    公开(公告)日：2009-06-03

    申请号：EP07792923.0

    申请日：2007-08-23

    Applicant: Bridgestone Corporation

    Inventor： IKEHARA, Kiyoshi

    IPC: D07B1/06 ,  B60C9/00 ,  B60C9/22

    CPC classification number: B60C9/0007 ,  B60C9/22 ,  D07B1/0613 ,  D07B1/0633 ,  D07B1/0653 ,  D07B5/10 ,  D07B2201/1004 ,  D07B2201/1076 ,  D07B2201/2006 ,  D07B2201/2018 ,  D07B2201/2023 ,  D07B2201/2024 ,  D07B2201/2029 ,  D07B2201/2039 ,  D07B2201/204 ,  D07B2201/2051 ,  D07B2201/206 ,  D07B2401/208 ,  D07B2501/2046 ,  D07B2801/12

    Abstract: A steel cord which has no production problem noted in the related art and which can be produced efficiently with stable quality, particularly a steel cord useful for the purpose of reinforcing a tire crown portion, as well as a composite of rubber and steel cord and a tire, which include the steel cord, are provided.
    A steel cord has a multi-twist structure in which N (N = 2 to 8) strands 2 are twisted, each strand 2 being formed by twisting a plurality of element wires 1 and having a substantially elliptical cross-section, wherein d1/d2 > 1.08 is satisfied, where the major diameter of the strand 2 is represented by d1 and the minor diameter is represented by d2, and ε c defined by the following equation: ϵ c = √ ⁢ - b / 2 + √ ⁢ b 2 / 4 - c - 1
    (in the equation, b represents -1 + π 2 (-4R 2 + d 2 )/P 2 , c represents π 2 d 2 k(4π 2 R 2 + P 2 )/P 4 , R represents (D - d)/2, k represents tan 2 (π/2 - π/N), and d represents (d1 + d2)/2) satisfies ε c > 0.005, where the diameter of a circle circumscribing the cord is represented by D (mm) and the twist pitch of the cord is represented by P (mm).

    Abstract translation: 现有技术中没有注意到生产问题的钢丝帘线，其质量可以高效率地生产，特别是用于加强轮胎胎冠部分的钢帘线，以及橡胶和钢帘线和 提供包括钢丝绳的轮胎。 钢帘线具有N（N = 2〜8）股2绞合的多捻结构，每股2是通过扭转多个元件丝1而形成的，具有大致椭圆形的横截面，其中d1 / d2 > 1.08，其中股2的长径由d1表示，小直径由d2表示，μc由下式定义：õc =š ¢ - b / 2 +š ¢b 2/4-c-1（在等式中，b表示-1 + -2（-4R 2 + d 2）/ P 2，c表示2 d 2 k（4 -2 R 2 + P 2）/ P 4 ，R表示（D-d）/ 2，k表示tan 2（À/ 2À/ N），d表示（d1 + d2）/ 2）满足μc> 0.005，其中， 帘线由D（mm）表示，帘线的捻距由P（mm）表示。

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