US3922841A - Steel cord - Google Patents

Steel cord Download PDF

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Publication number
US3922841A
US3922841A US489325A US48932574A US3922841A US 3922841 A US3922841 A US 3922841A US 489325 A US489325 A US 489325A US 48932574 A US48932574 A US 48932574A US 3922841 A US3922841 A US 3922841A
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US
United States
Prior art keywords
filaments
core strand
strand
lay
outer layer
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.)
Expired - Lifetime
Application number
US489325A
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English (en)
Inventor
Tomoaki Katsumata
Norihisa Matsushima
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.)
Sumitomo Electric Industries Ltd
Original Assignee
Sumitomo Electric Industries Ltd
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 Sumitomo Electric Industries Ltd filed Critical Sumitomo Electric Industries Ltd
Application granted granted Critical
Publication of US3922841A publication Critical patent/US3922841A/en
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • D07B1/0613—Reinforcing cords for rubber or plastic articles the reinforcing cords being characterised by the rope 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
    • D07B2201/2095—Auxiliary components, e.g. electric conductors or light guides
    • D07B2201/2097—Binding wires
    • D07B2201/2098—Binding wires characterized by special properties or the arrangements of the binding wire
    • 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
    • D07B2401/2065—Reducing wear
    • D07B2401/207—Reducing wear internally
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S57/00—Textiles: spinning, twisting, and twining
    • Y10S57/902—Reinforcing or tyre cords

Definitions

  • ABSTRACT A steel cord for reinforcing rubber or plastic goods having a core strand consisting of a plurality of wire filaments, and a plurality of outer strands cabled to gether around the core strand and each of which consisting of a plurality of wire filaments.
  • the direction of lay of the outer layer of the core strand filaments and the direction of lay of the outer layer of the outer strands are made opposite to each other, and the former direction is same with that of the cabling of the outer strands.
  • the number of the wire filaments constituting the outer layer of the core strand is the same as the number of the outer strands.
  • the lay length of the core strand, the outer strands and of the cabling are so selected that the filaments in the outer layer of the core strand and the corresponding filaments in the outer strands have linear contact over their whole length. Thanks to the linear contact of the filaments, fretting of the filaments is less likely to appear resulting in improvement in fatigue endurance and breaking strength. Adhesion to the rubber or the plastic material is also improved and the overall diameter of the cord can be reduced for a given effective crosssectional area ratio.
  • the present invention relates to steel cords, and more particularly to steel cords for reinforcing rubber or plastic goods such as tires for vehicles.
  • cords of the multi-strand type (or stranded rope structure) have been used which consist of a cord strand in which a plurality of wire filaments are stranded together, and a plurality of outer strands which are cabled to encircle the core strand and each of which consists of a plurality of wire filaments.
  • Such cords of multistrand type thus comprises 28 7X4 38 (lX3+5X7 wire filaments and so on.
  • the cords of conventional structure very often show, after a long distance run of the vehicle, fretting marks in the wire filaments which are caused by mutual abrasion of those wire filaments, and usually some of the frettings are found to have developed to fatigue breakmg.
  • a steel cord for reinforcing rubber or plastic goods comprising a core strand consisting of a plurality of wire filaments stranded together, and a plurality of outer strands cabled together to encircle the core strand and each of which consists of a plurality of wire filaments, characterized in that the lay direction of outer layers of said core strand and of each of said outer strands are opposite to each other, that the lay direction of said cabling of said outer strands is the same as that of the outer layer of said core strand, that the number of wire filaments in the outer layer of said core strand is the same as the number of said outer strands, and that the lay length of said outer layers of said core strand and outer strands and the lay length of said cabling of the outer strands is so selected that the wire filaments in said two outer layers forming linear contact with each other over their entire length.
  • the wire filaments may be made of iron, steel, or alloy steel such as stainless steel.
  • the number of wire filaments included in one core strand and one outer strand is preferably three through seven, respectively, but this is not exclusive.
  • cord of multi-strand type may further be wrapped helically by a wire filament and that such modification is within the scope of the invention.
  • those wire filaments of the outer strand, which are positioned to contact those wire filaments of the core strand are orientated to make linear contact with the later, since the wire filaments in the outer layers of core and outer strands have opposite or reverse lay directions with each other and since the lay direction of the cabling of the outer strands is the same as the direction of lay of outer layer of the core strand.
  • the present invention provides an improved steel cord in which the mutually contacting wire filaments in the core strand and the outer strands are layed perfectly in parallel with each other, making linear contact, by suitably selecting the number of the wire filaments and lay length.
  • FIG. 1 shows a cross section of a steel cord embodying the present invention, in which 32 wire filaments (l X 7 6 X 4 1) are employed.
  • FIG. 2 shows a cross section of another steel cord embodying the present invention, in which 27 wire filaments(l +1 X 5+ 5 X 4+ 1) are employed.
  • a steel cord comprises a core strand 1 consisting of wire filaments and six outer strands 2, each of which consist of four wire filaments and are cabled around the core strand.
  • the direction of lay of the outer layer of the core strand is 2, while the direction of lay the outer strands is S, and the direction of lay of the cabling of the outer strands is Z.
  • the convex portions or crests of the core strand 1 are regularly positioned at the concave portions or valleys of outer strands 2, as seen from FIG. 1, or vice versa.
  • the number of wire filaments stranded in the outer layer of the core strand is m
  • the number of wire filaments stranded in the outer layer of the outer strand is n
  • the lay length of the lay cabling is A
  • the length of the outer layer of the outer strand is B
  • the lay length of the outer layer of the core strand is C, respectively.
  • both the core strand and each of the outer strands are solid rod
  • lines of contact of the core strand with the outer strands would be M in number and extend spirally along the periphery of the core strand. It will be understood that the regularity is obtained when the number of crests or valleys of both strands emerging on a spiral line of contact are equal to each other.
  • the outer strand makes l/A turns around the core strand in the unit length of the steel cord. Since the directions are the same for the lay of the outer layer of the core strand and the lay of groupstrand, the number of the crests or valleys of the core strand which intersect a spiral line of contact is given by the following equation.
  • the diameters of the core and the outer strands, number of the wire filaments and the diameter of the wire filaments are determined suitably taking the geometric conditions into account, as is the case of conventional stranded ropes.
  • the outer diameter of the core strand 0 through 5% larger than the theoretical diameter. Namely, since the crests formed by the wire filaments in the core strand are conveniently and regularly received by the valleys formed between adjacent wire filaments in the outer strand, no gaps, which would otherwise inevitably exist between the core and outer strands, are formed, thereby presenting a compact or close stranding. In other words, the sectional area ratio of the wire filaments is high as compared to conventional steel cords.
  • the reference numeral 3 in FIG. 1 designates a filament spirally wrapping around said steel cord.
  • the breaking strength of the first core was measured to be 202 Kg, which amounts to 95.1% of the sum of the breaking strength of wire elements.
  • This embodiment consisting of 3 1 wire filaments of the same diameter is free from the problem of mingling of the filaments of the different diameter, and easy to manufacture.
  • breaking strength and the fatigue endurance are considerably higher than those of the conventional cords.
  • the linear contact between the filaments of the core and the outer strands which is obtained by suitably selecting the number of filaments, directions of lays, and the length of lay, the following advantageous are obtained.
  • the steel cord of the invention suffers less reduction of the breaking strength from the stranding and cabling than the conventional arrangement, and the breaking strength reaches almost to the sum of strengths of all filaments. More strictly, the breaking strength of the cords of the invention amounts to 95 through 98% of the sum of strengths of the filaments, whereas in the conventional arrangement only 90 through 93% of the sum is available for the breaking strength of the cord.
  • both strands would be even and regular in the sheared surface of the cord when the later is sheared as necessitated.
  • the larger effective cross-sectional area can be obtained as compared to the conventional arrangement.
  • the sectional area ratio is considerably higher than that of the conventional arrangement. This feature is particularly advantageous for the use in tires of vehicles where the end numbers per inch is limited.
  • a reinforcing steel cord including a core strand consisting of a plurality of wire filaments, a plurality of outer strands cabled together around said core strand, each outer strand consisting of a plurality of wire filaments, the improvement wherein; said core strand comprises a core filament and an outer layer of filaments, the lay direction of the outer layer of the core strand filaments and the lay direction of the outer strand filaments are opposite to each other, the lay direction of the cabling of the said outer strands is the same as that of the outer layer of said core strand filaments, the number of said filaments constituting said outer layer of said core strand is the same as the number of said outer strands, and the lay length of the core strand, the lay length of the outer strands and the cabling of the outer strands are so selected that the filaments in the outer layer of the core strand and the corresponding filaments in the outer strands contact each other linearly over their whole length.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Ropes Or Cables (AREA)
US489325A 1973-07-17 1974-07-17 Steel cord Expired - Lifetime US3922841A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP48081957A JPS604312B2 (ja) 1973-07-17 1973-07-17 補強用スチ−ルコ−ド

Publications (1)

Publication Number Publication Date
US3922841A true US3922841A (en) 1975-12-02

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Family Applications (1)

Application Number Title Priority Date Filing Date
US489325A Expired - Lifetime US3922841A (en) 1973-07-17 1974-07-17 Steel cord

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US (1) US3922841A (enrdf_load_stackoverflow)
JP (1) JPS604312B2 (enrdf_load_stackoverflow)

Cited By (23)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0040877A1 (en) * 1980-05-26 1981-12-02 Gencord S.p.A. Metal wire cord having strands with parallel filaments
US4311001A (en) * 1978-12-08 1982-01-19 Glushko Mikhail F Method for manufacturing twisted wire products and product made by this method
US4543298A (en) * 1983-08-24 1985-09-24 Stahlcord Betriebsgesellschaft M.B.H. Metal cord
US4679387A (en) * 1983-05-16 1987-07-14 Akzo Nv Reinforcing cord with wrapping wire
US4749016A (en) * 1982-08-10 1988-06-07 Bridgestone Corporation Radial tire having an improving durability
US4809492A (en) * 1986-09-13 1989-03-07 Vereinigte Drahtseilwerke Gmbh Torsionally balanced wire rope or cable
US4828001A (en) * 1985-08-06 1989-05-09 Toyo Tire & Rubber Co., Ltd. Steel cord for reinforcing an automobile tire
US5461850A (en) * 1992-12-18 1995-10-31 N.V. Bekaert S.A. Multi-strand steel cord having a core and peripheral strands surrounding the core
US5994647A (en) * 1997-05-02 1999-11-30 General Science And Technology Corp. Electrical cables having low resistance and methods of making same
US6019736A (en) * 1995-11-06 2000-02-01 Francisco J. Avellanet Guidewire for catheter
US6049042A (en) * 1997-05-02 2000-04-11 Avellanet; Francisco J. Electrical cables and methods of making same
US6137060A (en) * 1997-05-02 2000-10-24 General Science And Technology Corp Multifilament drawn radiopaque highly elastic cables and methods of making the same
FR2795751A1 (fr) 1999-06-29 2001-01-05 Michelin Soc Tech Cable d'acier multicouches pour carcasse de pneumatique
US6215073B1 (en) 1997-05-02 2001-04-10 General Science And Technology Corp Multifilament nickel-titanium alloy drawn superelastic wire
US6313409B1 (en) 1997-05-02 2001-11-06 General Science And Technology Corp Electrical conductors and methods of making same
US6399886B1 (en) 1997-05-02 2002-06-04 General Science & Technology Corp. Multifilament drawn radiopaque high elastic cables and methods of making the same
US6449834B1 (en) 1997-05-02 2002-09-17 Scilogy Corp. Electrical conductor coils and methods of making same
US6739433B1 (en) * 1998-02-26 2004-05-25 Otis Elevator Company Tension member for an elevator
US20040206579A1 (en) * 1998-02-26 2004-10-21 Baranda Pedro S. Tension member for an elevator
US7028542B2 (en) 2004-07-30 2006-04-18 Metni N Alan Reduced drag cable for use in wind tunnels and other locations
US7874404B1 (en) 1998-09-29 2011-01-25 Otis Elevator Company Elevator system having drive motor located between elevator car and hoistway sidewall
US20120211310A1 (en) * 2009-10-14 2012-08-23 Danilo Peric Elevator system and load bearing member for such a system
EP3133205A4 (en) * 2014-04-14 2017-12-27 Jiangsu Fasten Technology Development Center Co. Ltd. Steel wire rope for conveyor belt

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
LU79218A1 (fr) * 1978-03-13 1979-10-29 Bekaert Sa Nv Cordage metallique de renforcement et son mode de fabrication
JPS6445883A (en) * 1987-08-07 1989-02-20 Toyo Tire & Rubber Co Radial tire for car
JP2988593B2 (ja) * 1991-03-19 1999-12-13 ブリヂストンメタルファ株式会社 耐腐食疲労性に優れたスチールコード

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3352098A (en) * 1964-12-23 1967-11-14 American Chain & Cable Co Multi-element wire line having compacted strands
US3391530A (en) * 1966-09-29 1968-07-09 Cf & I Steel Corp Wire rope
US3778993A (en) * 1971-12-07 1973-12-18 M Glushko Method of manufacturing twisted wire products
US3834149A (en) * 1971-11-30 1974-09-10 Dawson & Usher Improvements in wire ropes, strands and wire ropes produced therefrom

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3209528A (en) * 1963-04-26 1965-10-05 Armco Steel Corp Flexible wire rope core
US3295310A (en) * 1964-03-27 1967-01-03 Bethlehem Steel Corp Wire rope particularly useful for independent wire rope core
BE654920A (enrdf_load_stackoverflow) * 1964-10-28 1965-02-15
US3306022A (en) * 1965-04-30 1967-02-28 United States Steel Corp Wire rope

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3352098A (en) * 1964-12-23 1967-11-14 American Chain & Cable Co Multi-element wire line having compacted strands
US3391530A (en) * 1966-09-29 1968-07-09 Cf & I Steel Corp Wire rope
US3834149A (en) * 1971-11-30 1974-09-10 Dawson & Usher Improvements in wire ropes, strands and wire ropes produced therefrom
US3778993A (en) * 1971-12-07 1973-12-18 M Glushko Method of manufacturing twisted wire products

Cited By (27)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4311001A (en) * 1978-12-08 1982-01-19 Glushko Mikhail F Method for manufacturing twisted wire products and product made by this method
EP0040877A1 (en) * 1980-05-26 1981-12-02 Gencord S.p.A. Metal wire cord having strands with parallel filaments
US4749016A (en) * 1982-08-10 1988-06-07 Bridgestone Corporation Radial tire having an improving durability
US4679387A (en) * 1983-05-16 1987-07-14 Akzo Nv Reinforcing cord with wrapping wire
US4543298A (en) * 1983-08-24 1985-09-24 Stahlcord Betriebsgesellschaft M.B.H. Metal cord
US4828001A (en) * 1985-08-06 1989-05-09 Toyo Tire & Rubber Co., Ltd. Steel cord for reinforcing an automobile tire
US4809492A (en) * 1986-09-13 1989-03-07 Vereinigte Drahtseilwerke Gmbh Torsionally balanced wire rope or cable
US5461850A (en) * 1992-12-18 1995-10-31 N.V. Bekaert S.A. Multi-strand steel cord having a core and peripheral strands surrounding the core
US6019736A (en) * 1995-11-06 2000-02-01 Francisco J. Avellanet Guidewire for catheter
US5994647A (en) * 1997-05-02 1999-11-30 General Science And Technology Corp. Electrical cables having low resistance and methods of making same
US6049042A (en) * 1997-05-02 2000-04-11 Avellanet; Francisco J. Electrical cables and methods of making same
US6137060A (en) * 1997-05-02 2000-10-24 General Science And Technology Corp Multifilament drawn radiopaque highly elastic cables and methods of making the same
US6449834B1 (en) 1997-05-02 2002-09-17 Scilogy Corp. Electrical conductor coils and methods of making same
US6215073B1 (en) 1997-05-02 2001-04-10 General Science And Technology Corp Multifilament nickel-titanium alloy drawn superelastic wire
US6248955B1 (en) 1997-05-02 2001-06-19 General Science And Technology Corp Electrical cables having low resistance and methods of making the same
US6313409B1 (en) 1997-05-02 2001-11-06 General Science And Technology Corp Electrical conductors and methods of making same
US6399886B1 (en) 1997-05-02 2002-06-04 General Science & Technology Corp. Multifilament drawn radiopaque high elastic cables and methods of making the same
US6739433B1 (en) * 1998-02-26 2004-05-25 Otis Elevator Company Tension member for an elevator
US20040206579A1 (en) * 1998-02-26 2004-10-21 Baranda Pedro S. Tension member for an elevator
US20090107776A1 (en) * 1998-02-26 2009-04-30 Baranda Pedro S Tension member for an elevator
US9352935B2 (en) 1998-02-26 2016-05-31 Otis Elevator Company Tension member for an elevator
US7874404B1 (en) 1998-09-29 2011-01-25 Otis Elevator Company Elevator system having drive motor located between elevator car and hoistway sidewall
FR2795751A1 (fr) 1999-06-29 2001-01-05 Michelin Soc Tech Cable d'acier multicouches pour carcasse de pneumatique
US7028542B2 (en) 2004-07-30 2006-04-18 Metni N Alan Reduced drag cable for use in wind tunnels and other locations
US20120211310A1 (en) * 2009-10-14 2012-08-23 Danilo Peric Elevator system and load bearing member for such a system
EP3133205A4 (en) * 2014-04-14 2017-12-27 Jiangsu Fasten Technology Development Center Co. Ltd. Steel wire rope for conveyor belt
RU2665900C2 (ru) * 2014-04-14 2018-09-04 Цзянсу Фастен Текнолоджи Девелопмент Сентер Ко., Лтд Стальной проволочный трос для конвейерной ленты

Also Published As

Publication number Publication date
JPS5029855A (enrdf_load_stackoverflow) 1975-03-25
JPS604312B2 (ja) 1985-02-02

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