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Tire crown reinforcement consisting of two working crown layers

A technology for working tire crown layer and crown reinforcement, which is applied to the reinforcement layer of pneumatic tires, tire parts, special tires, etc., can solve problems such as high tire manufacturing cost, reduce the number of layers, improve durability and performance improved effect

Active Publication Date: 2020-02-07
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] In all the solutions proposed above, the presence of one or more layers of additional reinforcing elements leads to greater tire mass and higher tire manufacturing costs

Method used

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  • Tire crown reinforcement consisting of two working crown layers

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Embodiment Construction

[0057] In the figure, a tire 1 of size 12R 22.5 has an aspect ratio H / L equal to 0.90, H being the height of the tire 1 on the rim on which it is mounted and L being its maximum axial width. Said tire 1 comprises a radial carcass reinforcement 2 anchored in two beads (not shown in the figures). The carcass reinforcement 2 is formed of a single layer of metal cords. The tire further comprises a tread 5 .

[0058] 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:

[0059] - a first working layer 41 formed by metal cords oriented at an angle equal to 16°,

[0060] - a second working layer 42 formed of metal cords oriented at an angle equal to 30° and crossing the metal cords of the first working layer 41, the cords of each of the working layers 41, 42 being in oriented on each side in the circumferential direction.

[0061] The metal cords constituting the reinforcing ...

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Abstract

The invention relates to a tire having an aspect ratio H / L strictly greater than 0.75, said tire comprising a crown reinforcement (4) consisting of two working crown layers (41, 42) of reinforcing elements. According to the invention, the two working crown layers (41, 42) are present only over at least 40% of the width of the tread (5) forming the crown reinforcement (4), the difference between the absolute values ​​of the angles a2 and a1 The absolute value is greater than 9°, a2 is larger than a1 in absolute value, and the average angle a satisfies the following relationship: 14+131*exp(‑L / 100)

Description

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

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B60C3/04B60C9/20
CPCB60C2200/06B60C9/20B60C3/04B60C2009/2016B60C2009/2019B60C2009/209
Inventor O·富尼耶L·贝斯滕
Owner MICHELIN & CO CIE GEN DES ESTAB MICHELIN