LU82707A1 - SINGLE-LEADED WIRE ROPE SUITABLE FOR REINFORCING ELASTOMERIC PRODUCTS - Google Patents

Description

Single-strand wire rope suitable for reinforcing elastomeric products

The present invention relates to a reinforcement for elastomeric products, in particular motor vehicle tires, pressure hoses, conveyor belts and the like. suitable single-strand wire rope.

It is known to use metal strands for reinforcing and reinforcing deformable goods made of rubber-like material. These consist of several, usually 3, 4

A

or 5 twisted, individual metal wires, the metal wires preferably being coated with brass to increase the adhesive force between the metal wire and the rubber-like material. The manufacture of these strands is based on very thin steel wires, which generally have a diameter between 0.10 and 0.40 mm. These wires are combined into a single rotating device to form the strands described.

20th

The requirements placed on these metal strands relate to tensile stresses, bending loads, axial compression, but also internal wear, corrosion, fatigue and other loads.

25th

Due to the progressive development, mainly in the automobile tire construction, various corrosion-promoting interventions in the traffic system like the salting of icy streets, as well as the general economic efficiency in the master price 30, the manufacturers are forced to new strand designs. One of the desired properties of new types of strands is the total wettability of the steel component by the elastomer component. In order to achieve this property, as described in DE-OS 26 19 086 35, the structure of the strand which is as open as possible has been sought. The advantage of these metal strands is thus based on the principle of a structure that is as open as possible and the increased wettability as a result, whereby the strength of the wires integrated in the construction should be as high as possible.

- 2 - r

The rope described in said DE-OS consists of helically shaped wires and one or more individual steel wrapping wires which are wound on two or more individual steel core wires, 5 but which are not themselves wound around one another. The core wires are of the same helical shape. They are arranged side by side and against each other so that each of the. Core wires are in linear contact with at least one other core wire, the contact line running parallel to the direction of the core wires and the wrapping wires being helical.

The aim of the invention was to propose a reinforcement rope which can be produced in a lightweight construction and which has a completely open stranding shape and generally fully supports the strength of all the wires entering the construction.

This goal is achieved by the wire rope 20 according to the invention, which is characterized in that three steel wires arranged parallel to one another, generally lying in a plane, form an untwisted strand and is wrapped by a fourth steel wire with a lay length such that the length of the fourth Wire exceeds the entire 25 rope length by a maximum of 3%, with at least two of the three parallel wires being crossed at least once over a section of at most 15 cm and all wires being in pre-deformed and pressed-together form.

'30 The three parallel wires and the fourth wire have preferably identical diameters, which are generally between 0.10-0.40 mm.

Since, according to the invention, the three parallel wires lie next to one another 35 and the fourth wire surrounding them has a large lay length, it is a practically completely open construction which meets the requirements with regard to wettability.

- 3 - r

The three parallel wires touch each other as a result of the construction form according to the invention essentially via linear contact surfaces.

5 Furthermore, the construction form of the metal wire according to the invention, in which all the wires are carried, results in a lower loss of breaking strength compared to known designs, which leads to a. The fatigue strength increases, but the modulus of elasticity 10 is not changed significantly compared to conventional designs.

The developed metal wire is twist-free and straight in the relieved state, which creates an ideal prerequisite for the manufacture of car tires, for example with regard to the manufacture of calendered layers.

The lack of twist and straightness result from the following combined measures during production: 20 - The three parallel wires lying on one plane are exchanged for certain lengths, which also compensates for length and quality differences; 2g - The wrapping wire is firmly pressed onto the * parallel wires and subjected to a pre-deformation together with them.

Through this type of manufacture of the constructed according to the invention. 2o metal wire gives it a very high mechanical stability.

Further advantages and features emerge from the description of the drawings, in which FIGS. 1, 2 and 3 show cross sections through conventional wire strands; 35 FIG. 4 is a view of that shown in FIG. 2

Construction; FIG. 5 shows a cross section through the wire rope according to the invention, while FIG. 6 shows a view of the same.

t - 4 -

In the previously known metal strands shown in FIGS. 1, 2, 3 and 4, 3, 4 or 5 twisted wires form a strand. These all have a center that forms a free space and leads to the disadvantages 5 described.

In contrast to these known designs, the metal wire according to the invention, in its cross section shown in FIG. 5, has a completely open construction, due to the 10 parallel wires (1-2-3) lying in one plane, which are “by the wrapping wire” (4) achieve their mechanical stability.

This winding is illustrated in FIG. 6, the% 15 lay length and the phase being selected such that there is no bulge of the strand at the cross points of the three parallel wires.

As can be seen, the construction of the strand according to the invention shown in FIGS. 5 and 6 20, in contrast to twisted strands, is completely open and, during calendering, allows complete wetting by means of rubber-like material of all the wires involved in it. There are no central cavities. The rubber-like material can wet anywhere, 25 which means that the metal wires are permanently protected against corrosion and the adhesion to the rubber-like material, which is considerably impaired by them, is prevented.

Since the rubber-wetted parallel wires only had line contact at-1 30, the wear resistance is reduced and since, as already stated, the individual, processed wires generally contribute fully with their strength to the quality of the strand, this results in a strand with the smallest possible diameter, which is the case with calendered material price-35 has a favorable effect.

- 5 - /

The strand is manufactured in a simple way of production that fully meets the economic requirements.

»%

Claims (7)

1. For the reinforcement of elastomeric goods, in particular vehicle tires, pressure hoses, conveyor belts, suitable 5 single-stranded wire rope, characterized in that three steel wires arranged parallel to one another and generally lying in a plane form an untwisted strand which is wrapped by a fourth steel wire. 10th 2. Steel wire rope according to claim 1, characterized in that the length of the fourth wire exceeds the entire rope length by at most 3%. 3. Steel wire rope according to claims 1 and 2, characterized in that at least two of the three parallel wires are crossed at least once on a section of maximum 15 cm. 4. Steel wire rope according to claims 1-3, characterized in that all the wires are in pre-deformed form and pressed together. 5. Steel wire rope according to claims 1-4, characterized in that the three parallel wires and the fourth wire preferably have identical diameters. 6. Steel wire rope according to claims 1-5, characterized 30 indicates that the wire diameter is between 0.1 and 0.4 mm. 7. steel wire rope according to claims 1-6, characterized in that the lay length and the lay phase of the fourth wire run between the cross points of the three parallel wires.