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Tyre comprising a tread with a foamed material

A tire and tread technology, applied in the field of tires made of porous (honeycomb) materials, can solve the problems of weakening the driving layer and reducing tire performance, and achieve the effect of a strong driving layer

Inactive Publication Date: 2014-01-08
OCIETE DE TECH MICHELIN +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These accumulated air bubbles form large size cavities which weaken the ride layer and reduce the performance of the tire

Method used

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  • Tyre comprising a tread with a foamed material
  • Tyre comprising a tread with a foamed material
  • Tyre comprising a tread with a foamed material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0042] In some of the figures depicting the tyre, signs have been marked comprising mutually perpendicular axes X, Y, Z corresponding to the radial X, axial Y and circumferential Z directions of the tyre.

[0043] figure 1 and 2 A portion of a tire according to a first embodiment of the invention, indicated by the general reference numeral 10 , is depicted in . In these figures, tire 10 has the desired outer profile after removal from the curing mold.

[0044] Tire 10 includes a reinforcement layer 12 covered by a tread 14 .

[0045] As known per se, the reinforcing layer 12 comprises metal or textile reinforcements 16 embedded in conventional rubber.

[0046] The tread 14 comprises an outer rubber layer, called a cap layer 14A, made of porous material, in which hollow tread pattern elements 18 are formed, and an inner rubber layer 14B having a hardness greater than that of the outer layer. Thus, the inner layer 14B is radially interposed between the running layer 14A and ...

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PUM

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Abstract

The invention relates to a tyre comprising a tread (14) having a rolling layer (14A) consisting of a foamed material having a thickness E and an expansion rate higher than or equal to 50%. The rolling layer (14A) comprises hollow tread pattern elements (20, 22, 26). At least 95% of the hollow tread pattern elements (20, 22, 26) each meet the following two conditions a) and b): a) the tread pattern element (20, 22, 26) is separated from at least one other hollow tread pattern element (20, 22, 26) by a distance shorter than or equal to DP = 7 mm, the distance separating two hollow tread pattern elements (20, 22, 26) being the shortest distance between said two tread pattern elements (20, 22, 26) covered in the foamed material, and b) the tread pattern element (20, 22, 26) has a depth at least equal to 80 % of the thickness E of the rolling layer (14A).

Description

technical field [0001] The invention relates to the field of tires comprising porous (cellular) materials. Background technique [0002] In order to improve the grip of a tire, documents WO2009 / 003576 or WO2009 / 003577 provide a tire comprising a tread having: [0003] - an outer rubber layer, subsequently called the running layer, of porous material in which the hollow tread pattern elements are formed, and [0004] - An inner rubber layer having a hardness greater than that of the outer layer. [0005] To manufacture said tyres, unvulcanized blanks are produced, comprising a mass of rubber (mass) intended to form the running layer combined with a porogen. The billet is then placed in a vulcanization mold where it is heated under pressure. [0006] Under the action of heat and pressure, chemical reactions involving porogens generate gas bubbles, which form cavities in the material, which thus become porous or cellular. The outer contour of the running layer is set by the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B60C11/14
CPCB60C11/14B60C11/005B60C2011/147B60C11/032B29D30/0662
Inventor J·梅里诺洛佩斯D·瓦瑟尔O·库希托S·珀蒂让
Owner OCIETE DE TECH MICHELIN