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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
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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
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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
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Publication date
Application filed by Akzo GmbH filed Critical Akzo GmbH
Priority to AT84104319T priority Critical patent/ATE32923T1/en
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
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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
    • D—TEXTILES; PAPER
    • D07—ROPES; CABLES OTHER THAN ELECTRIC
    • D07B—ROPES OR CABLES IN GENERAL
    • D07B2201/00—Ropes or cables
    • D07B2201/10—Rope or cable structures
    • D07B2201/1012—Rope or cable structures characterised by their internal structure
    • D07B2201/102—Rope or cable structures characterised by their internal structure including a 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
    • D07B2201/2095—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
    • D07B2501/00—Application field
    • D07B2501/20—Application field related to ropes or cables
    • D07B2501/2046—Tyre cords
    • 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

  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.

Landscapes

  • Tires In General (AREA)
  • Ropes Or Cables (AREA)
  • Yarns And Mechanical Finishing Of Yarns Or Ropes (AREA)
  • Tyre Moulding (AREA)

Abstract

A reinforcing cord made of several steel wires includes a metal wrapping wire coiled around steel wires. The hardness of the wrapping wire is substantially less than the hardness of the steel wires. Preferably the wrapping wire is a flat wire whose longer side engages the cord.

Description

Die Erfindung betrifft einen Verstärkungscord aus mehreren Stahldrähten zur Verstärkung von elastomeren Erzeugnissen, bestehend aus Stahldrähten und mindestens einem flachen Umschlingungsdraht aus Metall, dessen Härte deutlich geringer ist als die Härte der Stahldrähte, wobei eine der Breitseiten des Umschlingungsdrahtes die Stahldrähte berührt.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.

Derartige Verstärkungscorde sind aus FR-A-731 314 bekannt, welche als Wulstverstärkung im Autoreifen dienen. Hierbei kommt es besonders darauf an, dass in den Verstärkungscorden auch dann, wenn sie in den Wulst eingebettet sind, die den Wulst verstärkenden Stahldrähte in paralleler Anordnung bleiben. Dies kann zum Beispiel dadurch gewährleistet werden, dass sehr flache Bänder aus einem deutlich weicheren Werkstoff um die Stahldrähte derart gewickelt werden, dass ein Teil des Werkstoffes der flachen Bänder in die von den Stahldrähten gebildeten Hohlräume gepresstwird, wodurch die Stahldrähte in ihrer Lage festgehalten werden.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.

Die bekannten Verstärkungscorde sind bisher für die Lauffläche von Reifen nicht eingesetzt worden.The known reinforcement cords have not yet been used for the tread of tires.

Es sind lediglich aus der DE-C-803 801 Verstärkungscorde mit flachem Umschlingungsdraht bekannt geworden. Der Umschlingungsdraht erfüllt dabei die Aufgabe, den Cordverbund zusammenzuhalten und ein Spleissen der Stahldrähte zu verhindern. Wenn ein solcher Cord in ein elastomeres Material eingebettet ist, so ist bei Belastung dieses Materials, beispielsweise eines Fahrzeugluftreifens, die Gefahr der Reibkorrosion gegeben. Die Reibkorrosion ist eine der Ursachen, die zur Reduzierung der Lebensdauer von mit Verstärkungscorden verstärkten elastomeren Erzeugnissen führen.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.

Die Gefahr der Reibkorrosion ist immer dann gegeben, wenn zwei Metalloberflächen berührenden Kontakt haben, wobei diese beiden Metalloberflächen unter Belastung einer geringfügigen gegenseitigen Verschiebung unterworfen sind. Ein solcher Zustand tritt zwischen den Metalldrähten des Verstärkungscordes, welche im elastomeren Erzeugnis die Belastung aufnehmen, und den Umschlingungsdrähten bei dynamischer Beanspruchung des verstärkten elastomeren Erzeugnisses ein.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.

Aufgabe der vorliegenden Erfindung ist es, einen Verstärkungscord der eingangs genannten Art zur Verfügung zu stellen, bei welchem die Gefahr der Reibkorrosion bei den tragenden Stahldrähten weitgehend reduziert wird, wobei gleichzeitig die anderen guten Eigenschaften des Verstärkungscordes erhalten bleiben. Die Lebensdauer des verstärkten elastomeren Materials soll erhöht werden.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.

Diese Aufgabe wird bei Verstärkungscorden der eingangs genannten Art dadurch gelöst, dass jeder Umschtingungsdraht abgeflacht ist, dass die Härte jedes Umschlingungsdrahtes etwa 30 bis 60% der Härte der Stahldrähte beträgt, und das Verhältnis von Dicke zu Breite jedes Umschlingungsdrarites zwischen 0,4 und 0,7 liegt.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.

Bevorzugt beträgt die Härte jedes Umschlingungsdrahtes etwa 30 bis 50% von der Härte der Stahldrähte und/oder liegt das Verhältnis von Dikke und Breite jedes Umschlingungsdrahtes zwischen 0,5 bis 0,6.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.

Die Härte der bei Fahrzeugluftreifen für Verstärkungscorde verwendeten Stahldrähte liegen bei Werten von 795 bis 917 HV 0,05. Hierbei ist die Härte nach Vickers angegeben. Sie wird nach DIN 50133 Blatt 2 bestimmt. Solche Stahldrähte haben Zugfestigkeiten, die zwischen 2 600 bis 3 000 N/ mm2 liegen. Neuerdings werden auch Stahldrähte eingesetzt, die eine höhere Zugfestigkeit, beispielsweise 3 400 N/mm2, besitzen. Diese Stahldrähte besitzen dann eine entsprechend höhere Härte.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.

Werden beispielsweise Stahldrähte mit einer Härte von etwa 917 HV 0,05 und einer Zugfestigkeit von etwa 3 000 N/mm2 zur Herstellung eines Verstärkungscordes eingesetzt, so soll der Umschlingungsdraht erfindungsgemäss eine Härte von 275 bis 509 HV 0,05, vorzugsweise bis 459 HV 0,05 aufweisen. Ein solcher Umschlingungsdraht hat dann eine Zugfestigkeit, die zwischen 900 und 1 800 N/mm2, vorzugsweise bis 1 500 N/m M2 liegt.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.

Verwendet man erfindungsgemäss für den Umschlingungsdraht auch einen Stahldraht, so kann die Härte und die Zugfestigkeit in bekannter Weise über die Auswahl der Stahlsorte (Höhe des Kohlenstoffgehaltes, Höhe der Legierungszusätze), über eine Reduzierung der Vorverformung oder über eine geeignete Wärmenachbehandlung eingestellt werden. Für die Umschlingungsdrähte kann aber auch ein anderer metallischer Werkstoff mit entsprechenden Härteeigenschaften bzw. Zugfestigkeiten verwendet werden.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.

Bei dem in der obengenannten DE-PS 803 801 beschriebenen Verstärkungscord kann als Umschlingungsdraht auch ein flacher Umschlingungsdraht eingesetzt werden, durch welchen neben einer Erhöhung der Widerstandskraft gegenüber der Spleisswirkung eine Verringerung des Gesamtdurchmessers erreicht wird.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.

Nicht nur die geringere Härte des Umschlingungsdrahtes in den angegebenen Grenzen, sondern auch die flache Ausbildung des Umschlingungsdrahtes verringert die Gefahr der Reibkorrosion bei Verstärkungscorden, wenn beim Querschnitt des Umschlingungsdrahtes bestimmte geometrische Grössenverhältnisse eingehalten werden, weil im Gegensatz zum Umschlingungsdraht mit kreisförmigem Querschnitt beim Einsatz des Umschlingungsdrahtes mit flachem Querschnitt nicht mehr punktförmiger, sondern linienförmiger Kontakt zwischen Umschlingungsdraht und tragenden Stahldrähten erreicht wird. Bei dynamischer Belastung, entsprechend den Beanspruchungsverhältnissen im Reifen, verteilen sich die von aussen einwirkenden Kräfte somit auf eine grössere Fläche, wodurch die spezifische Flächenbelastung sowohl für die tragenden Stahldrähte als auch für die Umwicklungsdrähte verringert wird. Begünstigend wirkt sich dabei aus, dass der gedrehte Flachdraht je nach Schlaglänge in jedem Fall höhere Dehnwerte aufweist als ein vergleichbarer runder Draht. Dies führt zu einem besseren duktilen Verhalten und somit zu einer höheren Beanspruchbarkeit.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.

Das Aufbringen dieses abgeflachten Umschlingungsdrahtes kann dadurch geschehen, dass entweder der Umschlingungsdraht um das Seil gezwirnt wird oder der Umschlingungsdraht auf das um seine eigene Achse rotierende Seil mit der Breitseite abgelegt wird.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.

Die Abflachung des Umschlingungsdrahtes kann dadurch bewerkstelligt werden, dass ein Draht mit rundem Querschnitt flachgewalzt oder durch einen Ziehstein dessen Ziehloch rechteckigen Querschnitt aufweist, gezogen wird, wobei in Breitenrichtung quer zur Laufrichtung des Drahtes auf einen Formzwang verzichtet wird und dieses Drahtmaterial in dieser Richtung frei fliessen kann.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.

Die Verringerung der Gefahr der Reibkorrosion auf erfindungsgemässe Weise lässt sich praktisch bei allen Verstärkungscord-Konstruktionen anwenden, welche Umschlingungsdrähte aufweisen.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.

Um die Vielfalt der möglichen erfindungsgemässen Verstärkungscord-Konstruktionen aufzuzeigen, werden nachfolgend beispielsweise folgende Konstruktionen genannt:

Figure imgb0001
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

Hierin bedeutet d der Durchmesser der Stahldrähte, welcher bei üblichen Verstärkungscorden zwischen 0,15 und 0,25 mm liegt.Here, d means the diameter of the steel wires, which is between 0.15 and 0.25 mm for conventional reinforcing cords.

Mit U ist der Umschlingungsdraht bzw. die Umschlingungsdrähte bezeichnet, welche in der Ausführungsform mit üblichen rundem Querschnitt einen Durchmesser von 0,12 bzw. 0,15 mm aufweisen und abgeflacht sind.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.

Diese Erfindung beschränkt sich jedoch nicht auf die angegebenen Durchmesser der Stahldrähte bzw. der Umschlingungsdrähte.However, this invention is not limited to the specified diameters of the steel wires or the wrapping wires.

Die Querschnittsfläche des abgeflachten Umschlingungsdrahtes ist etwa gleich gross wie die Querschnittsfläche des zur Abflachung verwendeten Drahtes mit rundem Querschnitt und beträgt vorzugsweise etwa 0,01 bis 0,02 mm2.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 .

Die Schlaglänge der runden wie der flachen Umschlingungsdrähte liegt vorteilhafterweise bei 2,5 bis 5 mm. Die mit derartigen Umschlingungsdrähten ausgestatteten Verstärkungscorde werden bei Fahrzeugluftreifen vorteilhafterweise in der Karkasse eingesetzt.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.

In der Regel bestehen die Metalldrähte auch für erfindungsgemässe Verstärkungscorde aus einem kohlenstofflegierten Stahldraht. Die Stahldrähte müssen eine gute Bindung mit dem elastomeren Material eingehen. Deshalb werden die Stahldrähte mit einem zweiten Material, Kunststoff oder einem anderen Material beschichtet, wobei zwischen Stahldraht und Beschichtungswerkstoff einerseits und Beschichtungswerkstoff und elastomeren Material andererseits eine gute Bindungseigenschaft vorhanden sein muss. Mit Messing beschichtete Stahldrähte finden bevorzugt Anwendung.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.

Bei allen oben beschriebenen erfindungsgemässen Ausgestaltungen der Verstärkungscorde wurde festgestellt, dass die übrigen Eigenschaften der Verstärkungscorde beispielsweise Zugfestigkeit, Durchdringung des elastomeren Materials oder Kompressionsmodul höchstens in unwesentlicher Weise beeinflusst wurden.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.

Der Kompressionsmodul wird auf folgende Weise bestimmt: Ein Verstärkungscord bzw. Verstärkungsseil wird in ein elastomeres Material mit definierten Eigenschaften eingebettet. Das elastomere Material wird bei der Einbettung zu einer zylinderförmigen Probe geformt, deren Querschnitt kreisförmig ist, und in deren Achse der Verstärkungscord bzw. das Verstärkungsseil angeordnet und eingebettet ist. Die Probe hat definierte Länge und definierten Durchmesser. Durch Druckbelastung der beiden (kreisförmigen) Stirnflächen wird die maximal mögliche Belastung ermittelt. In der Regel wird die maximal mögliche Belastung dann erreicht, wenn die Probe seitlich ausknickt.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.

Die erfindungsgemässen Verstärkungscorde finden bevorzugt Verwendung bei der Herstellung von Fahrzeugluftreifen, insbesondere von Luftreifen für Lastkraftwagen oder Erdbewegungsmaschinen.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.

Die Erfindung wird anhand der nachfolgenden Figuren näher erläutert. Es zeigen:

  • Fig. 1 eine erfindungsgemässe Verstärkungscord-Konstruktion in vier Querschnitten,
  • Fig. 2 den erfindungsgemässen Verstärkungscord nach Fig. 1 in Draufsicht,
  • Fig. 3 den schematischen Aufbau eines Reifens.
  • Fig. 1 zeigt eine erfindungsgemässe Cordkonstruktion im Querschnitt, die aus sieben Litzen 2 mit jeweils vier einzelnen Stahldrähten 1 besteht, welche von einem Umschlingungsdraht 3, der abgeflacht ist, wendelförmig umwickelt ist, wobei eine der Breitseiten des Umschlingungsdrahtes 3 die Stahldrähte berührt. Hierbei sind vier Querschnitte senkrecht zur Seilachse nach den charakteristischen Verdrehungswinkeln 0°, 90°, 180° und 270° dargestellt, wobei die Zwirnrichtung des Umschlingungsdrahtes mit der des Pfeiles übereinstimmt.
  • Fig. 2 zeigt den Verstärkungscord nach Fig. 1 in Draufsicht, wobei hier wiederum die charakteristischen Verdrehungswinkel 0°, 90°, 180° und 270° markiert sind. Gleichzeitig ist die Schlaglänge des Umschlingungsdrahtes mit S bezeichnet.
  • Fig. 3 zeigt schematisch den Aufbau eines Reifens, in welchem erfindungsgemäss Verstärkungsteile eingebettet sind. Mit 4 ist die Lauffläche des Reifens bezeichnet, welcher hier als Radialreifen abgebildet ist. In die Lauffläche 4 sind zwei Lagen 5 und 6 von Verstärkungscorden eingebettet, welche unter einem bestimmten Winkel zur Umfangsrichtung verlaufen. Dieser Winkel richtet sich nach dem Einsatzgebiet des Reifens. In eine Karkasse 8 sind erfindungsgemässe Verstärkungscorde 7 in Umfangsrichtung des Reifenquerschnitts eingebettet. Die erfindungsgemässen Verstärkungscorde lassen sich auch in den Gürtellagen 5 und 6 einsetzen.
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 (1)

Application Number Priority Date Filing Date Title
AT84104319T ATE32923T1 (en) 1983-05-16 1984-04-17 REINFORCEMENT CORD WITH WRAP WIRE.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3317744 1983-05-16
DE3317744A DE3317744C2 (en) 1983-05-16 1983-05-16 Reinforcement cord with wrapping 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) ATE32923T1 (en)
CA (1) CA1246945A (en)
DE (2) DE3317744C2 (en)

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Also Published As

Publication number Publication date
ATE32923T1 (en) 1988-03-15
JPS6034689A (en) 1985-02-22
EP0125517A3 (en) 1985-10-09
US4679387A (en) 1987-07-14
CA1246945A (en) 1988-12-20
DE3317744A1 (en) 1984-11-22
DE3469769D1 (en) 1988-04-14
DE3317744C2 (en) 1985-08-22
EP0125517A2 (en) 1984-11-21

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