Abstract:
A machine for manufacturing a cord consisting of twisted metallic wires comprises a pair of crimping wheels with meshing toothed surfaces for crimping a plurality of wires when they are passed between said meshing toothed surfaces, and a twisting means for twisting together the wires along a twisting path downstream of the pair of crimping wheels. The pair of crimping wheels is arranged at the beginning of the twisting path and the twisting together of the wires preferably starts between the meshing toothed surfaces.
Abstract:
A (1 x n)-structure tire reinforcing steel cord which is installed by being wound at opposite side edges of the belt portion of the tire, and formed by twisting 4 to 7 strands each having a wire size of 0.20-0.45 mm, the cord having a spiral/planar waveform permanency, an elongation factor being 1.2-2.0% under a tensile load of 50 N in a tensile test based on JIS B 7721, a tensile load ranging from 50 to 250 N when the cord is linearized. The cord elongates properly by following up the expansion of the tire at tire building, and, after built, has a small elongation characteristic to thereby restrict a radial expansion caused by the high-speed continuous rotation of the tire.
Abstract translation:一种(1×n)结构的轮胎加强钢丝绳,其通过缠绕在轮胎的皮带部分的相对侧边缘而安装,并且通过扭绞4至7根线,每根线的捻度为0.20-0.45mm,绳索 在基于JIS B 7721的拉伸试验中,拉伸载荷为50N,拉伸载荷为50-250N时,拉伸系数为1.2-2.0%。 通过跟踪轮胎建造时的轮胎的膨胀,绳索适当地延伸,并且在内置之后具有小的伸长特性,从而限制由轮胎的高速连续旋转引起的径向膨胀。
Abstract:
A two-layer cord having a number of wires in the outer layer, enclosing, but not completely, a cord core formed by a plurality of core wires, and in which the core wires are not preformed, while at least some of the outer wires are preformed.
Abstract:
Tyre for motor vehicles, provided with a belt structure (3) interposed circumferentially between the carcass (2) and the tread band (4), and comprising at least one pair of belt plies (5,7) radially superimposed on each other and extending axially substantially by the same amount as said tread band. Each ply (5,7) has a plurality of cords (6,8) orientated obliquely with respect to the equatorial plane of the tyre and in opposite directions, and a reinforcing layer (10) radially external to said at least one pair of belt plies (5,7), having reinforcing elements (11) which are substantially parallel to each other and parallel to the equatorial plane. The reinforcing elements (11) of the 0° layer comprise single metal wires preformed according to a given preforming ratio, which have a high elastic modulus and a considerable elongation at low stresses.
Abstract:
A steel cord (50) comprises a core layer and an outer layer. The core layer comprises a number of first steel filaments (10) and the outer layer comprises a number of second steel filaments (20). The outer layer is helically twisted around the core layer. The first steel filaments have a twisting pitch greater than 310mm. At least one of the first steel filaments (10) is wavy preformed in one plane. At least one of the second steel filaments (20) is polygonally preformed.
Abstract:
Device for manufacturing metal cords to be used particularly for reinforcing composite elastomeric products, comprising: a supporting structure (100); a rotor (5) engaged with respect to said supporting structure (100) and rotatable according to a predefined axis; a cradle fastened to said supporting structure (100) according to an oscillation axis which coincides with the rotation axis of the rotor (5); feeding devices operatively fitted on said cradle to feed several elementary wires from the respective feeding spools (8), said elementary wires being driven onto said rotor (5) according to a stranding path with and sections (10A, 10C) coinciding with the rotation axis of the rotor (5) and with a central section (10B) distanced from said rotation axis; at least one preforming device (15) operatively engaged with the cradle and operating on one of said elementary wires in a section upstream with respect to the first end section (10A) of the stranding path. Furthermore, said at least one preforming device (15) is suitable for providing said elementary wire with a substantially sinusoidal deformation without sharp edges.
Abstract:
A steel cord (114) for the reinforcement of rubber products comprises strength elements (100, 132) and has length, a longitudinal central axis (112) and a cord pitch. Each of the elements (100) has a projection on a plane YZ perpendicular to the longitudinal central axis (112). At least one of these projections takes the form of a curve with a radius of curvature which alternates between a maximum and minimum. The curve further has a center of curvature. The radius of curvature and the center of curvature lie inside the curve so that a convex curve is obtained. The cord (114) is further characterized by one or both of the following features: (i) the distance between two minimum radii of curvature of said curve measured along the longitudinal central axis (112) is different from half the cord pitch; or (ii) if all of said elements (100) provide a convex curve, at least one of said convex curves substantially differs from another convex curve. The steel cord (114) allows full rubber penetration despite low values of cord diameter and part load elongation (PLE).
Abstract:
This invention relates to a steel cord for tire stably tight in twist, susceptible to impregnation of rubber thereinto, and less in elongation under light loading, and to a method of manufacturing such cords as above, which cord is characterized by being composed of three or more strands and one or more of them are provided with shaped parts in an approximate zigzag form along the longitudinal direction thereof; and the method of manufacturing the steel cord as above is characterized in that one or more than two stands are passed between a pair of toothed meshing surfaces of toothed-wheel-like shaping elements so as to be shaped zigzag and then the strands are twisted together while passed through twisting machine, whereby the cord is buried into the belt part of various kinds of tires for the final use.
Abstract:
The invention relates to a multi-strand steel cord comprising J central strands and K outer strands positioned around the J central strands, with J ≥1 and K ≥3. The J central strands comprise a core of L central filaments and at least a first layer of M filaments positioned around said core of L central filaments, with 1 ≤ L ≤ and 4≤ M ≤ 20. The K outer strands comprise a core of P central filaments and at least one layer of Q filaments positioned around said core of P central filaments, with 1 ≤ P≤ 5and 4≤ Q≤ 20. The circumferential surface of the core of L central filaments of the J central strands is coated with polymer material whereas the circumferential surface of the J central strands is free or substantially free of polymer material. Furthermore the K outer strands are free or substantially free of polymer material. The invention further relates to a method of manufacturing such multi-strand steel cord.