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Double-layer multi-strand cord with coated inner layer and improved performance

A cord, double-layer technology, applied in the field of multi-strand cord, can solve the problems of cord breakage and ineffectiveness

Active Publication Date: 2022-07-08
MICHELIN & CO CIE GEN DES ESTAB MICHELIN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] However, while this solution is effective against obstacles of relatively small or medium size, it has proven ineffective against obstacles of larger size
Specifically, in such cases, the load applied to the cord exceeds the hardness of the steel, so the obstacle can break the cord

Method used

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  • Double-layer multi-strand cord with coated inner layer and improved performance
  • Double-layer multi-strand cord with coated inner layer and improved performance
  • Double-layer multi-strand cord with coated inner layer and improved performance

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0115] Embodiments of tires according to the invention

[0116] The reference frames X, Y, Z are shown in the figures, which correspond to the usual axial direction (X), radial direction (Y) and circumferential direction (Z) of the tire, respectively.

[0117] The "circumferential midplane" M of the tire is the plane perpendicular to the axis of rotation of the tire and equidistant from the annular reinforcing structure of each bead.

[0118] figure 1 and figure 2 A tire according to the invention is shown with the general reference 10 .

[0119] The tire 10 is used for construction site type heavy vehicles, such as "dump truck" type heavy vehicles. Thus, the tire 10 has a size of the 53 / 80R63 type.

[0120] The tire 10 has a crown 12 reinforced by a crown reinforcement 14, two sidewalls 16 and two beads 18, each of these beads 18 being reinforced by an annular structure, in this case by a bead wire 20 . The crown reinforcement 14 is radially covered by the tread 22 an...

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Abstract

The invention relates to a double-layer multi-strand cord (50) comprising: an inner layer (CI) having two layers (C1, C3) and consisting of K > = 1 inner strands (TI), and an outer layer (CI) consisting of Lgt having two layers (C1 ', C3') and wound around the inner layer (CI); and an outer layer (CE) comprising one outer strand (TE). The cord (50) is obtained by a method comprising: a step of manufacturing a coated inner layer (CIG), in which the inner layer (CI) is surrounded by an elastomeric composition having a thickness G and then by L outer strands for forming the outer layer (CE), where L is strictly greater than Lmax, and L is greater than Lmax; lmax is the maximum number of outer strands (TE) that can be arranged on the theoretical outer layer (CET), obtained when the inner layer (CI) is in direct contact with the theoretical outer layer (CET).

Description

technical field [0001] The present invention relates to multi-strand cords that can be used in particular for reinforcing tires, especially tires for heavy industrial vehicles. Background technique [0002] A tire with radial carcass reinforcement includes a tread, two inextensible beads, two sidewalls connecting the beads to the tread, and a circumferentially disposed between the carcass reinforcement and the tread. Belt or crown reinforcement. The crown reinforcement includes several reinforcements with different functions. [0003] The crown reinforcement generally consists of a working reinforcement comprising two working plies or cross plies comprising filiform metallic working reinforcing elements which are substantially parallel to each other are arranged in each working ply, but cross from one ply to the other, ie they are inclined (symmetrically or asymmetrically) at an angle generally ranging between 15° and 40° with respect to the circumferential midplane. Amon...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D07B1/06
CPCD07B1/0613D07B1/0626D07B1/165D07B2201/1032D07B2201/2061D07B2201/2065D07B2201/2029D07B2201/2031D07B2201/202D07B2201/2051D07B2201/2074B60C9/0007B60C2200/065B60C9/20B60C2009/2096B60C2009/2067B29D2030/383B29D30/38D07B2801/12D07B2801/24
Inventor A·贾内蒂
Owner MICHELIN & CO CIE GEN DES ESTAB MICHELIN