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Tire including tread formed from various elastomer blends

A technology for elastomers and tires, applied in the direction of tire tread/tread pattern, heavy tires, tire parts, etc., can solve the problems of not being able to prevent punctures, not enough to maintain the integrity of crown reinforcements, etc.

Active Publication Date: 2021-07-30
MICHELIN & CO CIE GEN DES ESTAB MICHELIN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0028] These solutions do not prevent punctures and may not be sufficient to maintain the integrity of the entire crown reinforcement under some particularly severe driving conditions

Method used

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  • Tire including tread formed from various elastomer blends
  • Tire including tread formed from various elastomer blends
  • Tire including tread formed from various elastomer blends

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0054] exist figure 1 , a tire 1 of size 12R 22.5 comprises a radial carcass reinforcement 2 anchored in two beads (not shown in the figures) around the bead wire. The carcass reinforcement 2 is formed of a single layer of metal cords. The carcass reinforcement 2 is hooped by a crown reinforcement 5 , which is itself covered by a tread 6 . The tread comprises four grooves 3 forming five ribs 4 .

[0055] exist figure 1 The lower region and beads of the middle tire 1 are not particularly shown.

[0056] exist figure 1 , the crown reinforcement 5 is formed from the inside to the outside in the radial direction as follows:

[0057] - a triangular ply 51 formed of non-enveloped non-stretchable 9.28 metal cables continuous over the entire width of the ply and oriented at an angle equal to 65°,

[0058] - a first working layer 52 formed of non-enveloped non-stretchable 11.35 metal cables continuous over the entire width of the ply and oriented at an angle equal to 26°,

[005...

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Abstract

The invention relates to tires in which the tread comprises at least two layers (61, 62) of elastomeric blends. According to the invention, the first layer (61) forming the radially outer part of the tread extends radially inside the groove with a thickness of at least 1 mm and is formed of a first elastomer blend, said first elastomer The blend has a modulus of elasticity in tensile stress at 10% elongation of less than or equal to 10 MPa, the second layer (62) consists of a central part (621) and two axially outer parts (622), and is at least 1 mm thick The central portion of is formed from a second elastomeric blend having a modulus in tensile stress at 10% elongation of greater than or equal to 20 MPa and less than or equal to 0.30 The maximum tan(δ) value known as tan(δ)max, the axially outer portion is formed from a third elastomer blend having a value less than 0.10 known as tan(δ )max maximum tan(δ) value.

Description

technical field [0001] The present invention relates to tires, and more particularly to tires intended to fit vehicles carrying heavy loads and traveling at sustained speeds, such as trucks, tractors, trailers or coaches. Background technique [0002] In heavy type tires, the carcass reinforcement is usually anchored on both sides in the bead area and is radially covered by a crown reinforcement consisting of at least two layers, the At least two layers superimposed 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 between 10° and 45° . Said working layer forming the working reinforcement may further be covered with at least one layer, called protective layer, formed by a reinforcing element described below, advantageously metallic and stretchable, and called elastic reinforcing element . It may also comprise a layer of metal threads or cords of low extensibility forming an an...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B60C11/00
CPCB60C2200/06B60C2011/0025B60C2011/0033B60C11/0075
Inventor O·富尼耶J-L·盖贝尔-朱贝尔F·拉福特
Owner MICHELIN & CO CIE GEN DES ESTAB MICHELIN