EP0125517B1 - Reinforcement cord with lapping wire - Google Patents

Reinforcement cord with lapping wire Download PDF

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Publication number
EP0125517B1
EP0125517B1 EP84104319A EP84104319A EP0125517B1 EP 0125517 B1 EP0125517 B1 EP 0125517B1 EP 84104319 A EP84104319 A EP 84104319A EP 84104319 A EP84104319 A EP 84104319A EP 0125517 B1 EP0125517 B1 EP 0125517B1
Authority
EP
European Patent Office
Prior art keywords
steel wires
hardness
wrapping wire
wire
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.)
Expired
Application number
EP84104319A
Other languages
German (de)
French (fr)
Other versions
EP0125517A3 (en
EP0125517A2 (en
Inventor
Wolfgang Dr. Weidenhaupt
Peter Dismon
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.)
Akzo GmbH
Original Assignee
Akzo GmbH
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
Priority to DE3317744A priority Critical patent/DE3317744C2/de
Priority to DE3317744 priority
Application filed by Akzo GmbH filed Critical Akzo GmbH
Publication of EP0125517A2 publication Critical patent/EP0125517A2/en
Publication of EP0125517A3 publication Critical patent/EP0125517A3/en
Application granted granted Critical
Publication of EP0125517B1 publication Critical patent/EP0125517B1/en
Expired legal-status Critical Current

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Classifications

    • DTEXTILES; PAPER
    • D07ROPES; CABLES OTHER THAN ELECTRIC
    • D07BROPES OR CABLES IN GENERAL
    • D07B1/00Constructional features of ropes or cables
    • D07B1/06Ropes or cables built-up from metal wires, e.g. of section wires around a hemp core
    • D07B1/0606Reinforcing cords for rubber or plastic articles
    • D07B1/0613Reinforcing cords for rubber or plastic articles the reinforcing cords being characterised by the rope configuration
    • DTEXTILES; PAPER
    • D07ROPES; CABLES OTHER THAN ELECTRIC
    • D07BROPES OR CABLES IN GENERAL
    • D07B2201/00Ropes or cables
    • D07B2201/10Rope or cable structures
    • D07B2201/1012Rope or cable structures characterised by their internal structure
    • D07B2201/102Rope or cable structures characterised by their internal structure including a core
    • DTEXTILES; PAPER
    • D07ROPES; CABLES OTHER THAN ELECTRIC
    • D07BROPES OR CABLES IN GENERAL
    • D07B2201/00Ropes or cables
    • D07B2201/20Rope or cable components
    • D07B2201/2095Auxiliary components, e.g. electric conductors or light guides
    • D07B2201/2097Binding wires
    • D07B2201/2098Binding wires characterized by special properties or the arrangements of the binding wire
    • DTEXTILES; PAPER
    • D07ROPES; CABLES OTHER THAN ELECTRIC
    • D07BROPES OR CABLES IN GENERAL
    • D07B2501/00Application field
    • D07B2501/20Application field related to ropes or cables
    • D07B2501/2046Tire cords
    • YGENERAL 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
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10STECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S57/00Textiles: spinning, twisting, and twining
    • Y10S57/902Reinforcing or tire cords

Description

  • The invention relates to a reinforcing cord made of a plurality of steel wires for reinforcing elastomeric products, consisting of steel wires and at least one flat metal wrapping wire, the hardness of which is significantly lower than the hardness of the steel wires, one of the broad sides of the wrapping wire touching the steel wires.
  • Such reinforcing cords are known from FR-A-731 314, which serve as bead reinforcement in car tires. It is particularly important here that in the reinforcing cords, even if they are embedded in the bead, the steel wires reinforcing the bead remain in a parallel arrangement. This can be ensured, for example, by wrapping very flat strips of a significantly softer material around the steel wires in such a way that part of the material of the flat strips is pressed into the cavities formed by the steel wires, as a result of which the steel wires are held in their position.
  • The known reinforcement cords have not yet been used for the tread of tires.
  • There are only known from DE-C-803 801 reinforcement cords with flat loop wire. The loop wire fulfills the task of holding the cord assembly together and preventing the steel wires from being spliced. If such a cord is embedded in an elastomeric material, there is a risk of fretting corrosion when this material, for example a pneumatic vehicle tire, is loaded. Fretting corrosion is one of the causes that reduce the life of reinforcing cords reinforced elastomeric products.
  • Fretting corrosion is always present when two metal surfaces come into contact with one another, these two metal surfaces being subjected to a slight mutual displacement under load. Such a condition occurs between the metal wires of the reinforcing cord, which take up the load in the elastomeric product, and the looping wires when the reinforced elastomeric product is dynamically stressed.
  • The object of the present invention is to provide a reinforcing cord of the type mentioned at the outset, in which the risk of fretting corrosion in the supporting steel wires is largely reduced, while at the same time maintaining the other good properties of the reinforcing cord. The service life of the reinforced elastomeric material is to be increased.
  • This object is achieved in the case of reinforcing cords of the type mentioned at the outset in that each loop wire is flattened, that the hardness of each loop wire is approximately 30 to 60% of the hardness of the steel wires, and the ratio of thickness to width of each loop wire between 0.4 and 0. 7 lies.
  • The hardness of each loop wire is preferably approximately 30 to 50% of the hardness of the steel wires and / or the ratio of thickness and width of each loop wire is between 0.5 to 0.6.
  • The hardness of the steel wires used for pneumatic tires for reinforcing cords is between 795 and 917 HV 0.05. The Vickers hardness is given here. It is determined according to DIN 50133 sheet 2. Such steel wires have tensile strengths that are between 2,600 to 3,000 N / mm 2 . Steel wires with a higher tensile strength, for example 3,400 N / mm 2 , have recently also been used. These steel wires then have a correspondingly higher hardness.
  • If, for example, steel wires with a hardness of about 917 HV 0.05 and a tensile strength of about 3,000 N / mm 2 are used to produce a reinforcing cord, the loop wire according to the invention should have a hardness of 275 to 509 HV 0.05, preferably up to 459 HV Have 0.05. Such a loop wire then has a tensile strength which is between 900 and 1,800 N / mm 2 , preferably up to 1,500 N / m M2.
  • If, according to the invention, a steel wire is also used for the wrap wire, the hardness and the tensile strength can be adjusted in a known manner by selecting the type of steel (amount of carbon content, amount of alloy additives), reducing the pre-deformation or using a suitable heat treatment. Another metallic material with corresponding hardness properties or tensile strengths can also be used for the wrapping wires.
  • In the reinforcement cord described in the above-mentioned DE-PS 803 801, a flat loop wire can also be used as the loop wire, by means of which, in addition to an increase in the resistance to the splice effect, a reduction in the overall diameter is achieved.
  • Not only the lower hardness of the loop wire within the specified limits, but also the flat design of the loop wire reduces the risk of fretting corrosion with reinforcement cords if certain geometrical size ratios are maintained for the cross section of the loop wire, because in contrast to the loop wire with a circular cross section when using the loop wire with a flat cross-section no longer point-like, but linear contact between the loop wire and the supporting steel wires is achieved. With dynamic loading, corresponding to the stress conditions in the tire, the forces acting from outside are distributed over a larger area, which reduces the specific surface loading both for the load-bearing steel wires and for the wrapping wires. The fact that Depending on the lay length, the twisted flat wire always has higher elongation values than a comparable round wire. This leads to better ductile behavior and thus to greater stress resistance.
  • This flattened loop wire can be applied either by twisting the loop wire around the rope or by laying the loop wire with the broad side on the rope rotating about its own axis.
  • The wrap wire can be flattened by rolling a wire with a round cross-section flat or by pulling a drawing die with a rectangular cross-section in the drawing hole can.
  • The reduction in the risk of fretting corrosion in the manner according to the invention can be used practically for all reinforcing cord constructions which have loop wires.
  • In order to demonstrate the variety of possible reinforcement cord constructions according to the invention, the following constructions are mentioned below, for example:
    Figure imgb0001
  • Here, d means the diameter of the steel wires, which is between 0.15 and 0.25 mm for conventional reinforcing cords.
  • U is the wrap wire or the wrap wires, which in the embodiment have the usual round cross section and have a diameter of 0.12 or 0.15 mm and are flattened.
  • However, this invention is not limited to the specified diameters of the steel wires or the wrapping wires.
  • The cross-sectional area of the flattened loop wire is approximately the same size as the cross-sectional area of the wire with a round cross-section used for flattening, and is preferably approximately 0.01 to 0.02 mm 2 .
  • The lay length of the round as well as the flat loop wires is advantageously 2.5 to 5 mm. The reinforcing cords equipped with such wrapping wires are advantageously used in the carcass in pneumatic vehicle tires.
  • As a rule, the metal wires also consist of a carbon alloy steel wire for reinforcing cords according to the invention. The steel wires must bond well with the elastomeric material. For this reason, the steel wires are coated with a second material, plastic or another material, a good binding property having to be present between the steel wire and the coating material on the one hand and the coating material and elastomeric material on the other hand. Steel wires coated with brass are preferred.
  • In all of the reinforcement cords according to the invention described above, it was found that the other properties of the reinforcement cords, for example tensile strength, penetration of the elastomeric material or compression modulus, were at most insignificantly influenced.
  • The compression modulus is determined in the following way: A reinforcing cord or rope is embedded in an elastomeric material with defined properties. During the embedding, the elastomeric material is formed into a cylindrical sample, the cross section of which is circular, and in whose axis the reinforcement cord or the reinforcement cable is arranged and embedded. The sample has a defined length and a defined diameter. The maximum possible load is determined by the pressure load on the two (circular) end faces. As a rule, the maximum possible load is reached when the sample bends sideways.
  • The reinforcing cords according to the invention are preferably used in the manufacture of pneumatic vehicle tires, in particular pneumatic tires for trucks or earthmoving machines.
  • The invention is explained in more detail with reference to the following figures. Show it:
    • 1 is a reinforcing cord construction according to the invention in four cross sections,
    • 2 shows the reinforcement cord according to the invention according to FIG. 1 in plan view,
    • Fig. 3 shows the schematic structure of a tire.
    • Fig. 1 shows a cord construction according to the invention in cross section, which consists of seven strands 2, each with four individual steel wires 1, which is wrapped helically by a loop wire 3, which is flattened, one of the broad sides of the loop wire 3 touching the steel wires. Here, four cross sections perpendicular to the rope axis are shown according to the characteristic twist angles 0 °, 90 °, 180 ° and 270 °, the twisting direction of the loop wire coinciding with that of the arrow.
    • FIG. 2 shows the reinforcement cord according to FIG. 1 in a top view, here again the characteristic twist angles 0 °, 90 °, 180 ° and 270 ° are marked. At the same time, the lay length of the loop wire is denoted by S.
    • 3 schematically shows the structure of a tire in which reinforcement parts are embedded according to the invention. 4 with the tread of the tire, which is shown here as a radial tire. In the tread 4 two layers 5 and 6 of reinforcing cords are embedded, which at a certain angle to Circumferential direction. This angle depends on the area of application of the tire. Reinforcement cords 7 according to the invention are embedded in a carcass 8 in the circumferential direction of the tire cross section. The reinforcing cords according to the invention can also be used in the belt layers 5 and 6.

Claims (6)

1. A reinforcing cord composed of several steel wires for reinforcing elastomeric products, consisting of steel wires and at least one flat wrapping wire composed of metal of which the hardness is considerably lower than the hardness of the steel wires, wherein one of the wide sides of the wrapping wire contacts the steel wires, characterised in that each wrapping wire is flattened, the hardness of each wrapping wire is about 30 to 60% of the hardness of the steel wires and the ratio of thickness to width of each wrapping wire lies between 0.4 and 0.7.
2. A reinforcing cord according to claim 1, characterised in that the hardness of each wrapping wire is about 30 to 50% of the hardness of the steel wires.
3. A reinforcing cord according to claim 1 or 2, characterised in that the ratio of thickness to width of each wrapping wire lies between 0.5 and 0.6.
4. A reinforcing cord according to one or more of claims 1 to 3, characterised in that the cross- sectional area of each wrapping wire is about 0.01 to 0.02 mm2.
5. A reinforcing cord according to one or more of claims 1 to 4 for the production of pneumatic tyres for vehicles, in particular of pneumatic tyres for lorries or earth moving machinery.
6. Pneumatic tyre, characterised in that it contains reinforcing cords according to one or more of claims 1 to 4.
EP84104319A 1983-05-16 1984-04-17 Reinforcement cord with lapping wire Expired EP0125517B1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
DE3317744A DE3317744C2 (en) 1983-05-16 1983-05-16
DE3317744 1983-05-16

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
AT84104319T AT32923T (en) 1983-05-16 1984-04-17 Reinforcing cord with string wire.

Publications (3)

Publication Number Publication Date
EP0125517A2 EP0125517A2 (en) 1984-11-21
EP0125517A3 EP0125517A3 (en) 1985-10-09
EP0125517B1 true EP0125517B1 (en) 1988-03-09

Family

ID=6199073

Family Applications (1)

Application Number Title Priority Date Filing Date
EP84104319A Expired EP0125517B1 (en) 1983-05-16 1984-04-17 Reinforcement cord with lapping wire

Country Status (6)

Country Link
US (1) US4679387A (en)
EP (1) EP0125517B1 (en)
JP (1) JPS6034689A (en)
AT (1) AT32923T (en)
CA (1) CA1246945A (en)
DE (1) DE3317744C2 (en)

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Publication number Priority date Publication date Assignee Title
JPH0663187B2 (en) * 1985-12-23 1994-08-17 東京製鋼株式会社 Steel cord for reinforcing plastics
US4744805A (en) * 1986-05-22 1988-05-17 Air Products And Chemicals, Inc. Selective adsorption process using an oxidized ion-exchanged dehydrated chabizite adsorbent
US4747854A (en) * 1986-05-22 1988-05-31 Air Products And Chemicals, Inc. Selective chromatographic process using an ion-exchanged, dehydrated chabazite adsorbent
GB8624529D0 (en) * 1986-10-13 1986-11-19 Bekaert Sa Nv Flat cord for tyres
ES2028252T3 (en) * 1987-05-20 1992-07-01 N.V. Bekaert S.A. Intermediate steel wire coating.
DE8810534U1 (en) * 1988-08-19 1988-10-06 Sp Reifenwerke Gmbh, 6450 Hanau, De
US5082713A (en) * 1990-07-23 1992-01-21 Pirelli Armstrong Tire Corporation Wide monofilament reinforcing cords employing high performance thermoplastics and tire belts made therefrom
JP2746764B2 (en) * 1991-02-20 1998-05-06 不二精工株式会社 Bead wire
DE4212846C2 (en) * 1992-04-16 1997-08-14 Sp Reifenwerke Gmbh Reinforcement cord for elastomeric products
US6399886B1 (en) 1997-05-02 2002-06-04 General Science & Technology Corp. Multifilament drawn radiopaque high elastic cables and methods of making the same
US6215073B1 (en) 1997-05-02 2001-04-10 General Science And Technology Corp Multifilament nickel-titanium alloy drawn superelastic wire
US6019736A (en) * 1995-11-06 2000-02-01 Francisco J. Avellanet Guidewire for catheter
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
US6049042A (en) * 1997-05-02 2000-04-11 Avellanet; Francisco J. Electrical cables and methods of making same
US6313409B1 (en) 1997-05-02 2001-11-06 General Science And Technology Corp Electrical conductors and methods of making same
US5994647A (en) 1997-05-02 1999-11-30 General Science And Technology Corp. Electrical cables having low resistance and methods of making same
US6763875B2 (en) * 2002-02-06 2004-07-20 Andersen Corporation Reduced visibility insect screen
US20050098277A1 (en) * 2002-02-06 2005-05-12 Alex Bredemus Reduced visibility insect screen
US7250213B2 (en) * 2003-10-16 2007-07-31 American Wire Tie Inc. Textured wire tie and methods of making same
JP4776455B2 (en) * 2006-06-29 2011-09-21 株式会社ブリヂストン Heavy duty pneumatic radial tire
EP2145120A1 (en) * 2007-05-16 2010-01-20 Thyssenkrupp Elevator Capital Corporation Actively damped tension member
US8387216B1 (en) 2008-10-08 2013-03-05 Nite Ize, Inc. Tie wrap for bundling objects
US9174781B2 (en) 2008-10-08 2015-11-03 Nite Ize, Inc. Tie wrap for bundling objects
US8806723B2 (en) 2008-10-08 2014-08-19 Nite Ize, Inc. Tie wrap for bundling objects
USD774879S1 (en) * 2008-10-08 2016-12-27 Nite Ize, Inc. Tie wrap for bundling objects
USD863946S1 (en) 2008-10-08 2019-10-22 Nite Ize, Inc. Tie
USD863945S1 (en) 2008-10-08 2019-10-22 Nite Ize, Inc. Tie
CN102009570B (en) * 2009-09-04 2014-02-26 青岛双星轮胎工业有限公司 Steel wire ring for tires
USD745866S1 (en) 2011-08-02 2015-12-22 Nite Ize, Inc. Cantilevered snap fit case
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Also Published As

Publication number Publication date
AT32923T (en) 1988-03-15
CA1246945A (en) 1988-12-20
JPS6034689A (en) 1985-02-22
EP0125517A3 (en) 1985-10-09
DE3317744A1 (en) 1984-11-22
US4679387A (en) 1987-07-14
EP0125517A2 (en) 1984-11-21
CA1246945A1 (en)
DE3317744C2 (en) 1985-08-22

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