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Steel wire and automobile tyre

A steel wire and monofilament technology, applied in the direction of special tires, tire parts, reinforcement layers of pneumatic tires, etc., can solve problems such as detachment, fatigue fracture, and discontinuity in the length direction, and achieve the reduction of load resistance. Prevents disappearance of helical or wavy bends and inhibits the extension of steel wires

Active Publication Date: 2007-07-25
TOKUSEN IND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Moreover, in order to solve this problem, when the bending height is increased, as shown in FIG. 14 , a part of the monofilament having a small helical or wavy bend protrudes from the monofilament to a larger amount, and the protrusion caused by the protrusion becomes larger in the longitudinal direction. Discontinuity on the top, the stress concentrates on the protrusion, which becomes the starting point and is highly likely to cause fatigue fracture
In addition, if there are such discontinuous large protrusions in the length direction, in the kneading process of rubber product processing, the wire will not vibrate along the roller surface or the fixed rod surface, which not only becomes the arrangement of the wire in the length The cause of unevenness in direction, and sometimes the cause of accidents in which the wire is detached from the roll

Method used

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  • Steel wire and automobile tyre
  • Steel wire and automobile tyre
  • Steel wire and automobile tyre

Examples

Experimental program
Comparison scheme
Effect test

no. 1 approach

[0055] Fig. 1 is a sectional view of a steel wire according to the first embodiment of the present invention, and Fig. 2 is a view showing the locus of the monofilament on the projected plane when the twisted monofilament is arranged horizontally and projected on a horizontal plane.

[0056] In the steel wire of this embodiment, as shown in FIG. 1, for example, in a steel wire 110 having a 1×3 structure formed by twisting three monofilaments 111, 112, and 113 (filaments), one monofilament 111 has a Small helical or wavy monofilaments different from the helical curvature of wire twisting, and the other two monofilaments 112, 113 are straight monofilaments without bending except for the helical bending used for wire twisting ( normal yarns) are formed by twisting them firmly in a manner that the monofilaments are roughly close to each other at most of the twisted parts. Here, the small helical bend is a three-dimensional helical bend. The direction of the helical bending may be...

no. 2 approach

[0075] 3 is a cross-sectional view of a steel wire according to a second embodiment of the present invention, and FIG. 4 is a view showing a locus of the monofilament on a projected plane when the twisted monofilament is arranged horizontally and projected on a horizontal plane.

[0076] The steel wire of this embodiment, as shown in FIG. 3, is a core formed by twisting, for example, three core monofilaments 211a to 211c (steel wires) and nine sheath monofilaments 212a to 212i (steel wires) twisted around the core. ) of the steel wire 210 with a 3+9 structure, the core is densely packed with three core monofilaments 211a to 211c using straight monofilaments (normal filaments) that have no bends other than the helical bends used for wire twisting. The sheath is formed by twisting, and the sheath passes through three sheath monofilaments 212a, 212d, 212g among the nine sheath monofilaments 212a-212i to be monofilaments having a small helical or wavy bend (bend) different from the...

no. 3 approach

[0094] Fig. 5 is a cross-sectional view (a) of a steel wire of an example of the third embodiment of the present invention and a cross-sectional view (b) of a steel wire of another example, and Fig. 6 shows a monofilament having a bend after twisting the steel wire A diagram of the trajectory of a monofilament on the projected plane when it is configured horizontally and projected on a horizontal plane.

[0095] In the steel wire of this embodiment, as shown in FIG. Steel wire 310 of 3 / 9 structure in which core monofilaments 311a to 311c and sheath monofilaments 312a to 312i are twisted simultaneously in the same direction and at the same pitch. Straight monofilaments (normal filaments) without bending are densely twisted to form core, sheath monofilaments 312a to 312i, through which three sheath monofilaments 312c, 312f, and 312i are used for twisting and twisting. small helical or wavy-bent monofilaments (curved monofilaments) with different helical bends, and the other six...

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Abstract

By adjusting line periphery extruding amount of monofilaments having small twist or wave-shaped curves in advance and of at least one monofilament (111) of a 1n steel lines (110), at least one of sheath monofilament (212a-212i) of steel lines (210) having a m+n structure, or at least one of sheath monofilament (312a-312i) of steel lines (310) having a m / n structure, one can ensure that positions with a ratio L / d more than 0.7 do not exist at the whole monofilament perigon and more than two positions having a ratio L / d in the range of 0.07-0.7 exist at each space between twist helixes, wherein L represents a deviation amplitude between the track of monofilaments (111) which have been twisted up and have curves at a projection plane and a datum line of helix curve used in thread twisting, and d is a monofilament diameter. Therefore, rubber product reinforced steel cords exhibiting enough rubber accessibility and excellent fatigue resistance and tires for vehicles using said steel cords are obtained.

Description

technical field [0001] The present invention relates to a steel wire used as an embedding reinforcement material for rubber products such as automobile tires, and in particular to a steel wire having both sufficient rubber penetration and excellent fatigue resistance, and an automobile tire using the steel wire. Background technique [0002] As steel wires for reinforcing rubber products such as automobile tires and conveyor belts, for example, steel wires of a closed twist structure (so-called closed type) in which 3 to 6 monofilaments (steel wires) are densely twisted in a single layer has been widely used. The steel wire is formed into a composite sheet after a plurality of parallel parallel wires are covered with a rubber material, and then embedded in the rubber product. Therefore, the steel wire twisted with three steel wires is called a 1×3 structure. In addition, according to the single wire Quantity, and called 1 × 4, 1 × 5, 1 × 6 structure, usually called 1 × n st...

Claims

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Application Information

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IPC IPC(8): D02G3/48D07B1/06D07B1/10B29C70/20B60C1/00B60C9/00
CPCD07B1/0646D07B2201/2022D07B2201/2008D07B2201/2007
Inventor 石井功藤田昌也
Owner TOKUSEN IND CO LTD