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Tire for vehicles bearing heavy loads

A technology for tires and vehicles, applied in the field of vehicles, can solve the problems of increased tread attack and increased consequences of tread attack.

Inactive Publication Date: 2016-07-27
MICHELIN & CO CIE GEN DES ESTAB MICHELIN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The actual aggressiveness of rocky ground exacerbates not only this type of attack on the tread, but also the consequences of this attack on the tread

Method used

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  • Tire for vehicles bearing heavy loads
  • Tire for vehicles bearing heavy loads
  • Tire for vehicles bearing heavy loads

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0014] I. Measurements and tests used

[0015] Resistance to crack growth:

[0016] The rate of cracking was measured on a test sample of the rubber composition using a 381 type periodic fatigue equipment (elastomer test system) from MTS, as described below.

[0017] The crack resistance is measured on the test sample with repeated stretching actions, and the test sample is adjusted at the beginning (after the first stretching cycle), and then cut. The tensile test sample is composed of a parallelepiped-shaped rubber sheet, which has, for example, a thickness between 1 and 2 mm, a length between 130 and 170 mm, and a width between 10 and 15 mm. Each side is covered in the length direction with a cylindrical rubber band (5 mm in diameter) that makes it possible to anchor to the jaw of the tensile testing device. The test samples thus prepared are tested in the newly prepared state. The test is carried out in the atmosphere at a temperature of 20°C, 60°C or 80°C. After debugging, ...

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Abstract

The present invention relates to a tire for vehicles bearing heavy loads, having a tread which contains a composition made of at least one elastomer matrix containing polyisoprene and one unsaturated thermoplastic styrene elastomer. Said unsaturated thermoplastic elastomer is at most 50 wt% of the elastomer matrix and includes at least one rigid styrene segment and at least one flexible diene segment. The at least one flexible diene segment contains at least 20 wt% combined diene units. Said polyisoprene is more than 50% of the difference between the weight of the elastomer matrix and the weight of the unsaturated thermoplastic styrene elastomer. Said composition also consists of at least one reinforcing filler and a cross-linking system.

Description

Technical field [0001] The field of the invention is the field of tires for vehicles intended to carry heavy loads, especially buses, trucks, agricultural vehicles or civil engineering vehicles. Background technique [0002] Compared with the tread thickness of tires used for light vehicles, especially for passenger cars or trucks, these tires are equipped with a very thick tread of rubber material. Generally, the worn part of the tread of a heavy-duty vehicle has a thickness of at least 15 mm, while the thickness of the worn part of the tread of a civil engineering vehicle is at least 30 mm, in fact, even as high as 120 mm. [0003] During driving, the tread is subjected to mechanical stress and is subjected to attacks that result from direct contact with the ground. In the case of installing a tire on a heavy-duty vehicle, the mechanical stress and attack experienced by the tire are amplified by the weight of the tire. The consequence of this is that the initial cracks caused i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L7/00C08L53/02B60C1/00
CPCB60C1/0016C08L7/00C08L53/025
Inventor C·舒伟尔J-C·阿劳约达席尔瓦
Owner MICHELIN & CO CIE GEN DES ESTAB MICHELIN