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Tyre comprising three working layers

A technology of working layer and working tire crown layer, applied in the direction of heavy-duty tires, tire parts, reinforcement layers of pneumatic tires, etc., can solve problems such as high tire manufacturing cost, achieve performance improvement, promote durability performance, and reduce risks.

Active Publication Date: 2018-03-27
MICHELIN & CO CIE GEN DES ESTAB MICHELIN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0019] Moreover, the presence of additional layers of reinforcing elements leads to greater tire mass and higher tire manufacturing costs, regardless of the solutions envisaged as those described above

Method used

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  • Tyre comprising three working layers

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Embodiment Construction

[0059] In the figures, a tire 1 of size 315 / 80R 22.5Y has an aspect ratio H / S equal to 0.80, H being the height of the tire 1 on the rim on which it is mounted and S being its maximum axial width. Said tire 1 comprises radial carcass reinforcement 2 , not shown in the figures, anchored in two beads. The carcass reinforcement 2 is formed of a single layer of metal cords. They further comprise a tread 5 .

[0060] In the figures, the carcass reinforcement 2 is hooped according to the invention by a crown reinforcement 4 formed radially from the inside to the outside by:

[0061] - a first working layer 41 formed by metal cords oriented at an angle equal to 18°,

[0062] - a second working layer 42 formed by metal cords oriented at an angle equal to 30°,

[0063] - a third working layer 43 formed by metal cords oriented at an angle equal to -22°,

[0064] - A protective layer 44 formed of E18.23 elastic metal cords parallel to the wires of the working layer 43 .

[0065] The...

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Abstract

Tyre (1) comprising three working layers; according to the invention, the reinforcing elements of the two radially outermost working layers (42, 43) are crossed from one layer to the other making angles of between 20 and 45degree with the circumferential direction, the angles formed with the circumferential direction by the reinforcing elements of the radially innermost working layer being between15 and 20degree, the reinforcing elements of the two radially innermost working layers (41) being oriented in the same direction with respect to the circumferential direction, the difference betweenthe angles of the reinforcing elements of the radially innermost working layers being greater than 10degree, the widths (L42, L43) of the two radially outermost working layers (42, 43) being greater than 0.7 times the width (L5) of the tread, and the width (L41) of the radially innermost working layer (41) being strictly less than 0.7 times the width (L) of the tread.

Description

technical field [0001] The present invention relates to tires with radial carcass reinforcement, and more particularly to tires intended to be fitted to vehicles carrying heavy loads, such as trucks, tractors, trailers or coaches. Background technique [0002] In heavy-duty type tires, the carcass reinforcement is generally anchored on either side in the bead area and is radially covered by a crown reinforcement consisting of at least two layers overlapping and Formed by threads or cords parallel in each layer and crossing from one layer to the next, forming an angle with the circumferential direction of between 10° and 45°. Said working layer forming a working reinforcement may further be covered with at least one layer, called protective layer, formed of reinforcing elements, advantageously metallic and stretchable, called elastic reinforcing elements. It may also comprise a layer of metal threads or cords of low extensibility forming an angle between 45° and 90° with the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B60C9/20B60C9/28B60C9/00
CPCB60C2200/06B60C9/0007B60C9/185B60C9/28B60C2009/209B60C2009/2074B60C2009/2051B60C9/2006B32B15/02B32B25/00B32B2250/03
Inventor A·德乔治A·拉尔简L·拉普拉D·弗罗
Owner MICHELIN & CO CIE GEN DES ESTAB MICHELIN