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Tyre with a self-sealing ply

A self-sealing and tire technology, which is applied to tire parts, tires, wheels, etc., can solve the problems of reducing tire rolling resistance and not providing physical properties, so as to achieve the effect of improving grade and eliminating reduction

Active Publication Date: 2009-10-21
OCIETE DE TECH MICHELIN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, said document does not provide information on the physical characteristics of this composition, which also tends to reduce the rolling resistance of the tire, including itself

Method used

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  • Tyre with a self-sealing ply
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Examples

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Embodiment Construction

[0031] The dynamic properties of the elastomers were obtained on an MCR 301 rheometer from Anton Paar. The sample is a cylinder with a thickness of 2.5 mm and a diameter of 4 mm. The samples were placed in a thermal chamber between two plates, one fixed and the other vibrated sinusoidally around its center, and a normal stress of 0.02 MPa was also applied for the entire duration of the test. A deformation of maximum 1% was imposed and a temperature sweep was performed from -100°C to 250°C with a slope of 5°C / mn. The result adopted is the dynamic shear modulus G over the given temperature range * and loss factor tgδ, where:

[0032] G * = G ′ 2 + G ′ ′ 2 and tgδ=G″ / G′

[0033] G * : dynamic shear modulus in MPa;

[0034] G': tru...

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Abstract

The invention relates to a tyre (1) comprising at least two sidewalls (3), a crown (2) provided radially externally with a tread, a carcass-type reinforcing structure (7) and a crown reinforcement, the inner surface of the sidewalls (3) and the crown (2) forming an inner wall of the tyre. According to the invention, at least one portion of said wall is covered with a self-sealing ply (11) comprising a styrene thermoplastic (TPS) elastomer and the tyre can have a given working inflation pressure Pg. The invention is characterised in that, for any temperature within a given temperature range of between +30 DEG C and +100 DEG C, the self-sealing ply (11) has a loss factor tg delta of less than 0.2 and a dynamic modulus G* of less than Pg, tg delta and G* being measured at a frequency of 10 Hz.

Description

technical field [0001] The present invention relates to a tire comprising a self-sealing layer placed on its inner wall to close any holes formed as a result of punctures in use. Background technique [0002] In order to be useful, a self-sealing layer must meet a number of physical and chemical property conditions. In particular, it must be effective over a very wide range of operating temperatures and throughout the life of the tire. It must be able to close the hole while the piercing object, which we call a "nail", remains in place. When the nails are removed, the self-sealing layer must be able to fill the holes and make the tire airtight, especially in winter conditions. [0003] Many solutions have been conceived but have not yet been developed for passenger car tires which lack stability, especially over time, or effectiveness under extreme operating temperature conditions. [0004] In order to help maintain fuel efficiency at high temperatures, the document US 4,...

Claims

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Application Information

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IPC IPC(8): B60C19/12
CPCB60C19/122B29D2030/0695B29L2030/00B29D30/0685B29C73/20B29D2030/0694Y10T152/10684
Inventor L·阿尔贝J·梅里诺·洛佩斯L·西尔万M·阿胡瓦多P·勒萨热
Owner OCIETE DE TECH MICHELIN
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