US20080066844A1 - Steel Cord for Reinforcing Rubber Article, and Pneumatic Tire - Google Patents

Steel Cord for Reinforcing Rubber Article, and Pneumatic Tire Download PDF

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Publication number
US20080066844A1
US20080066844A1 US11/597,707 US59770705A US2008066844A1 US 20080066844 A1 US20080066844 A1 US 20080066844A1 US 59770705 A US59770705 A US 59770705A US 2008066844 A1 US2008066844 A1 US 2008066844A1
Authority
US
United States
Prior art keywords
cord
core
steel cord
rubber article
reinforcing
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Abandoned
Application number
US11/597,707
Other languages
English (en)
Inventor
Naohiko Obana
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Bridgestone Corp
Original Assignee
Bridgestone Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Bridgestone Corp filed Critical Bridgestone Corp
Assigned to BRIDGESTONE CORPORATION reassignment BRIDGESTONE CORPORATION ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: OBANA, NAOHIKO
Publication of US20080066844A1 publication Critical patent/US20080066844A1/en
Abandoned legal-status Critical Current

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Classifications

    • D—TEXTILES; PAPER
    • D07—ROPES; CABLES OTHER THAN ELECTRIC
    • D07B—ROPES OR CABLES IN GENERAL
    • D07B1/00—Constructional features of ropes or cables
    • D07B1/06—Ropes or cables built-up from metal wires, e.g. of section wires around a hemp core
    • D07B1/0606—Reinforcing cords for rubber or plastic articles
    • D07B1/062—Reinforcing cords for rubber or plastic articles the reinforcing cords being characterised by the strand configuration
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
    • B60C9/00—Reinforcements or ply arrangement of pneumatic tyres
    • B60C9/0007—Reinforcements made of metallic elements, e.g. cords, yarns, filaments or fibres made from metal
    • D—TEXTILES; PAPER
    • D07—ROPES; CABLES OTHER THAN ELECTRIC
    • D07B—ROPES OR CABLES IN GENERAL
    • D07B2201/00—Ropes or cables
    • D07B2201/20—Rope or cable components
    • D07B2201/2015—Strands
    • D07B2201/2023—Strands with core
    • D—TEXTILES; PAPER
    • D07—ROPES; CABLES OTHER THAN ELECTRIC
    • D07B—ROPES OR CABLES IN GENERAL
    • D07B2201/00—Ropes or cables
    • D07B2201/20—Rope or cable components
    • D07B2201/2015—Strands
    • D07B2201/2024—Strands twisted
    • D07B2201/2029—Open winding
    • D—TEXTILES; PAPER
    • D07—ROPES; CABLES OTHER THAN ELECTRIC
    • D07B—ROPES OR CABLES IN GENERAL
    • D07B2201/00—Ropes or cables
    • D07B2201/20—Rope or cable components
    • D07B2201/2015—Strands
    • D07B2201/2038—Strands characterised by the number of wires or filaments
    • D07B2201/2039—Strands characterised by the number of wires or filaments three to eight wires or filaments respectively forming a single layer
    • D—TEXTILES; PAPER
    • D07—ROPES; CABLES OTHER THAN ELECTRIC
    • D07B—ROPES OR CABLES IN GENERAL
    • D07B2201/00—Ropes or cables
    • D07B2201/20—Rope or cable components
    • D07B2201/2047—Cores
    • D07B2201/2052—Cores characterised by their structure
    • D07B2201/2059—Cores characterised by their structure comprising wires
    • D07B2201/206—Cores characterised by their structure comprising wires arranged parallel to the axis
    • D—TEXTILES; PAPER
    • D07—ROPES; CABLES OTHER THAN ELECTRIC
    • D07B—ROPES OR CABLES IN GENERAL
    • D07B2201/00—Ropes or cables
    • D07B2201/20—Rope or cable components
    • D07B2201/2047—Cores
    • D07B2201/2052—Cores characterised by their structure
    • D07B2201/2059—Cores characterised by their structure comprising wires
    • D07B2201/2061—Cores characterised by their structure comprising wires resulting in a twisted structure
    • D—TEXTILES; PAPER
    • D07—ROPES; CABLES OTHER THAN ELECTRIC
    • D07B—ROPES OR CABLES IN GENERAL
    • D07B2401/00—Aspects related to the problem to be solved or advantage
    • D07B2401/20—Aspects related to the problem to be solved or advantage related to ropes or cables
    • D07B2401/208—Enabling filler penetration
    • D—TEXTILES; PAPER
    • D07—ROPES; CABLES OTHER THAN ELECTRIC
    • D07B—ROPES OR CABLES IN GENERAL
    • D07B2501/00—Application field
    • D07B2501/20—Application field related to ropes or cables
    • D07B2501/2046—Tire cords
    • D—TEXTILES; PAPER
    • D07—ROPES; CABLES OTHER THAN ELECTRIC
    • D07B—ROPES OR CABLES IN GENERAL
    • D07B2501/00—Application field
    • D07B2501/20—Application field related to ropes or cables
    • D07B2501/2076—Power transmissions

Definitions

  • the present invention is related to a steel cord for reinforcing a rubber article and a pneumatic tire, particularly a steel cord used as a reinforcement material for a rubber article such as pneumatic tire and industrial use belt, and a pneumatic tire comprising the steel cord as a reinforcement material.
  • the rubber article, particularly the pneumatic tire, reinforced by the steel cord achieves weight lightening without losing durability.
  • a rubber penetration structure in which rubber penetrates inward the cord well enough not to form clearance which transmits water between filaments.
  • rubber permeation is realized by loosely twisting cords to increase the clearance between the filaments.
  • This structure is especially suitable for a single twist cord of the structures of 1 ⁇ 3 and 1 ⁇ 5.
  • the steel cord of high stiffness has been required recently. It is possible to secure tensile stiffness of the belt by increasing the number of driving cord in the tire belt. However, it becomes a cause of increasing tire weight, and besides, it becomes easy to invite belt edge separation in which clearance between adjacent cords is narrow in the belt, thereby rubber separation is easily transmitted, beginning at cord edge in belt width direction.
  • Patent reference 1 proposes a steel cord of a 2+4 twisting structure as a steel cord having high stiffness. Stiffness of this steel cord is relatively higher than that of a 1 ⁇ N structure which produces softness depending on twist.
  • Patent reference 1 JP 2002-227081 A
  • Another object of the present invention is to provide a pneumatic tire which satisfies weight lightening, durability, and driving stability simultaneously by applying the above mentioned steel cord to reinforcement materials for belts.
  • the steel cord for reinforcing a rubber article related to the present invention comprises a core formed of two non-twisted core wires parallelly arranged in longitudinal direction, and a single layered sheath formed of three to five sheath wires twisted around the above mentioned core, wherein the cord for reinforcing a rubber article has a flat outline shape in a cross section orthogonal to the cord axis and an inclination of the core wire viewed from the side of the cord is 3° or less with respect to the cord axis.
  • the steel cord for reinforcing the above mentioned rubber article is used as a reinforcement material for belts.
  • the steel cord of the present invention can increase tensile stiffness of a rubber article without inviting durability deterioration due to separation generated around the cord in the rubber article, thereby capable of satisfying weight lightening, durability and driving stability simultaneously in the pneumatic tire.
  • FIG. 1 is a schematic diagram showing a steel cord of Example 1
  • FIG. 2 is an enlarged cross sectional diagram showing the steel cord of Examples 1, 3, and 4.
  • FIG. 3 is an enlarged cross sectional diagram showing the steel cord of Example 1
  • FIG. 4 is an enlarged cross sectional diagram showing the steel cord of a comparative example.
  • a steel cord for reinforcing a rubber article of the present invention comprises a core formed of two non-twisted core wires parallelly arranged in a longitudinal direction; and a single layered sheath formed of three to five sheath wires twisted around the core, wherein the cord for reinforcing a rubber article has a flat outline shape in a cross section orthogonal to the cord axis.
  • inclination of the core wire is required 3° or less preferably substantial 0° with respect to the cord axis.
  • cord elongation caused by tension applied during manufacturing tires is restricted and a closed space between the core and sheath is not formed by aligning core wires laterally and substantially straightly.
  • rubber can easily permeate between the core wire and the sheath wire to prevent separation in which water penetrated inward from outside the tire through a cut and the like corrodes the belt cords and the corroded area expands to cause removal between the cord and the rubber.
  • the sheath wires are not univromly dispersed around the core in arrangement but in uneven arrangement (Ref. to FIG. 1 in the example later described).
  • vertical thickness of the cord can be reduced and further thickness of the belt layer can be reduced, thereby capable of reducing weight of the tire.
  • improved are softness against buckling deformation of the belt and cord breakage which are occurred outside the wheel tread during cornering.
  • tensile strength of the core wire and the sheath wire is 2.9 kN/mm 2 (300 kg/mm 2 ) or more.
  • diameter of the core wire and the sheath wire is preferably in the range from 0.21 mm to 0.24 mm. It is difficult to secure belt strength with less than 0.21 mm, while stiffness of bending outward the belt face becomes too high to decrease driving stability with more than 0.24 mm. The same wire diameter between the core wire and the sheath wire is advantageous in terms of productivity.
  • the steel cord of the present invention When the steel cord of the present invention is applied to a reinforcement material for belts, it is required that lateral alignment of the core wires is arranged substantially along the belt width. With this arrangement, stiffness against inward bending deformation produced along the belt face increases to improve tire driving stability. That means, in the steel cord of the present invention, because two core wires are laterally aligned and the core wires are laterally contact with each other, friction between core wires reacts against lateral bending deformation to increase stiffness of the lateral cord bending, and thereby lateral cord alignment is substantially along the belt width direction to increase inward bending stiffness in the tire belt. Further in the steel cord of the present invention, because vertical thickness is smaller than that of the conventional steel cord having a circular section, thickness of the rubber article such as belt also becomes smaller, thereby capable of reducing weight.
  • FIG. 1 shows a steel cord of a 2+4 twisting structure.
  • (a) is a partial side view seen from the above.
  • (b) is a cross sectional view of a section orthogonal to the cord axis at positions of a-a, b-b, c-c, d-d, e-e of (a).
  • (c) is a partial side view seen from the side.
  • (d) is a cross sectional view of a section orthogonal to the core axis at a positions of a-a, b-b, c-c, d-d, e-e of (c).
  • 1 is a core wire
  • 2 is a sheath wire
  • two core wires 1 are substantially Straight along the core axis
  • two cores are held in parallel.
  • Four sheath wires 2 are twisted on the external layer of the core wires 1 with a pitch P of 14 mm.
  • winding off tension during twisting wires was set higher than that of the sheath to reduce inclination of the core cord axis direction, thereby making an after forming amount appropriate.
  • FIG. 2 shows an enlarged cross section of these steel cords with the section orthogonal to the cord axis.
  • a specification of these steel cords (wire diameter, wire tensile strength, core wire inclination viewed from the side of the cord (core inclination in a cord major axis direction and core inclination in a cord minor axis direction, where “the major axis direction” is the maximum dimension direction of the cord cross section per pitch of sheath and the “minor axis direction” is a direction orthogonal to the major axis direction)) is shown in Table 1 below.
  • the produced steel cord was applied to a belt formed of a first belt layer and a second belt layer at driving frequency shown in Table 1 for trail production of a tire of size 185/70R14.
  • the inner first belt layer was arranged on a carcass with the steel cord inclined at an angle of left 22° with respect to a tire equational plane, and the second belt layer was further arranged with the steel cord inclined at an angle of right 22° with respect to a tire equational plane.
  • the tire was filled with inner pressure corresponding to the maximum load capacity of JATMA YEAR BOOK and mounted on a passenger car. After driving 50000 km on the paved roads, the tire was analyzed to examine a cord corrosion length from a cut and a crack length at the belt edge. If the corrosion length is 10 mm or less and the crack length is 2 mm or less, there is no problem with durability.
  • feeling evaluation was made by three drivers by driving with tires in the same driving mode on the specified test road. This feeling evaluation was conducted with scores of one to ten, and calculated by medium score of three drivers. If the value is 6.5 or more, there is no practical problem.
  • FIG. 3 shows an enlarged cross section orthogonal to a cord axis of steel cord of Example 2.
  • sheath wires 2 are substantially uniformly dispersed in arrangement of this steel cord.
  • Enlarged cross sections orthogonal to a cord axis of steel cord of Examples 3 and 4 are same with FIG. 2 .
  • FIG. 4 shows an enlarged cross section orthogonal to a cord axis of steel cord of a comparative example.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Ropes Or Cables (AREA)
  • Tires In General (AREA)
US11/597,707 2004-05-28 2005-05-23 Steel Cord for Reinforcing Rubber Article, and Pneumatic Tire Abandoned US20080066844A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
JP2004-158772 2004-05-28
JP2004158772 2004-05-28
PCT/JP2005/009327 WO2005121440A1 (fr) 2004-05-28 2005-05-23 Câble d'acier pour renforcer un article en caoutchouc, et pneu

Publications (1)

Publication Number Publication Date
US20080066844A1 true US20080066844A1 (en) 2008-03-20

Family

ID=35503098

Family Applications (1)

Application Number Title Priority Date Filing Date
US11/597,707 Abandoned US20080066844A1 (en) 2004-05-28 2005-05-23 Steel Cord for Reinforcing Rubber Article, and Pneumatic Tire

Country Status (5)

Country Link
US (1) US20080066844A1 (fr)
EP (1) EP1760190A4 (fr)
JP (1) JPWO2005121440A1 (fr)
CN (1) CN1961113A (fr)
WO (1) WO2005121440A1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20100005774A1 (en) * 2006-08-31 2010-01-14 Bridgestone Corporation Steel cord
CN105408129A (zh) * 2013-07-15 2016-03-16 弘德产业株式会社 轮胎加固用钢丝绳
CN106758437A (zh) * 2017-01-19 2017-05-31 江苏兴达钢帘线股份有限公司 一种（4+3）结构的超高强度钢帘线
US20190071820A1 (en) * 2016-03-17 2019-03-07 Nv Bekaert Sa A m+n steel cord for reinforcing rubber product

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4587391B2 (ja) * 2004-11-04 2010-11-24 株式会社ブリヂストン ゴム物品補強用スチールコードの製造方法
CN102264978B (zh) * 2008-12-22 2015-11-25 株式会社普利司通 橡胶制品加强用钢丝帘线及采用该钢丝帘线的充气轮胎
RU2596651C2 (ru) * 2011-03-24 2016-09-10 Бриджстоун Корпорейшн Металлокорд для армирования резиновых изделий и пневматическая шина с радиальным расположением нитей корда с использованием данного металлокорда
JP5937395B2 (ja) * 2012-03-23 2016-06-22 株式会社ブリヂストン 空気入りラジアルタイヤ
JP5814179B2 (ja) * 2012-05-10 2015-11-17 株式会社ブリヂストン ゴム物品補強用スチールコードおよびそれを用いたタイヤ
JP6516952B2 (ja) * 2012-09-26 2019-05-22 株式会社ブリヂストン 空気入りタイヤ
KR101647091B1 (ko) * 2014-10-14 2016-08-09 홍덕산업 주식회사 타이어 보강용 스틸코드
JP6717702B2 (ja) * 2016-08-05 2020-07-01 株式会社ブリヂストン 空気入りタイヤ

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3996733A (en) * 1976-01-27 1976-12-14 Uniroyal Inc. Reinforcing cord construction
DE8810534U1 (fr) * 1988-08-19 1988-10-06 Sp Reifenwerke Gmbh, 6450 Hanau, De
JPH04370283A (ja) * 1991-06-13 1992-12-22 Tokyo Seiko Co Ltd スチールコード
JPH09156314A (ja) * 1995-12-08 1997-06-17 Toyo Tire & Rubber Co Ltd 大型ラジアルタイヤ
JP3737610B2 (ja) * 1997-07-23 2006-01-18 株式会社ブリヂストン ゴム物品補強用スチール・コードおよび該スチール・コードを用いた空気入りラジアル・タイヤ
JP3484628B2 (ja) * 1999-06-25 2004-01-06 金井 宏彰 タイヤ補強用スチールコード
JP2001234486A (ja) * 2000-02-25 2001-08-31 Tokyo Seiko Co Ltd スチールコード及びゴム複合体
JP2002227081A (ja) * 2001-01-26 2002-08-14 Bridgestone Corp ゴム補強用スチールコード

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20100005774A1 (en) * 2006-08-31 2010-01-14 Bridgestone Corporation Steel cord
US7870715B2 (en) * 2006-08-31 2011-01-18 Bridgestone Corporation Steel cord
CN105408129A (zh) * 2013-07-15 2016-03-16 弘德产业株式会社 轮胎加固用钢丝绳
US20190071820A1 (en) * 2016-03-17 2019-03-07 Nv Bekaert Sa A m+n steel cord for reinforcing rubber product
US10975519B2 (en) * 2016-03-17 2021-04-13 Nv Bekaert Sa M+N steel cord for reinforcing rubber product
CN106758437A (zh) * 2017-01-19 2017-05-31 江苏兴达钢帘线股份有限公司 一种（4+3）结构的超高强度钢帘线

Also Published As

Publication number Publication date
JPWO2005121440A1 (ja) 2008-04-10
EP1760190A4 (fr) 2009-07-15
WO2005121440A1 (fr) 2005-12-22
EP1760190A1 (fr) 2007-03-07
CN1961113A (zh) 2007-05-09

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Legal Events

Date Code Title Description
AS Assignment

Owner name: BRIDGESTONE CORPORATION, JAPAN

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:OBANA, NAOHIKO;REEL/FRAME:018831/0555

Effective date: 20061128

STCB Information on status: application discontinuation

Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION