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Tyre with improved beads

A tire and bead technology, applied in tire parts, tire rims, vehicle parts, etc., can solve problems such as increasing the proportion of rubber

Active Publication Date: 2013-08-21
MICHELIN & CO CIE GEN DES ESTAB MICHELIN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As a result, the proportion of rubber that fails to meet the specification increases significantly

Method used

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  • Tyre with improved beads
  • Tyre with improved beads
  • Tyre with improved beads

Examples

Experimental program
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Embodiment Construction

[0036] Where the term "radial" is used, one skilled in the art should distinguish between several different uses of the term. First, the expression refers to the radius of the tire. This means that a point P1 is said to be "radially inside" a point P2 (or "radially inside" point 2) if it is closer to the axis of rotation of the tire than point P2. Conversely, a point P3 is said to be "radially outside" a point P4 (or "radially outside" point 4) if it is farther from the axis of rotation of the tire than point P4 is. Progress is said to be "radially inward (or outward)" when progressing toward a smaller (or larger) radius. The stated meaning of this term also applies when referring to radial distances.

[0037] In contrast, a thread or reinforcement is said to be "radial" when the reinforcing elements of the thread or reinforcement form an angle greater than or equal to 80° and less than or equal to 90° with the circumferential direction. It is noted herein that the term "th...

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PUM

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Abstract

Tyre comprising two beads (20) comprising an annular reinforcing structure (70) and a carcass reinforcement (60) which is anchored in the two beads by being wrapped around the annular reinforcing structure so as to form, in each bead, a main portion (62) and a wrapped-around portion (63), in which each bead comprises a bead filler (110) situated between the main portion and the wrapped-around portion of the carcass reinforcement, and an outer strip (120) positioned axially on the outside of the carcass reinforcement and of the bead filler, the bead filler (110) and the outer strip (120) being made of a rubber compound that has an elastic modulus G' less than or equal to 15 MPa and a viscous modulus G" such that: G"[MPa] <= 0.2 G' [MPa] - 0.2 MPa, the elastic and viscous moduli being measured at 23 DEG C; in which the entity formed by the bead filler (110) and the outer strip (120) has a thickness E(r), the thickness E(r) changes as a function of the distance r such that, in the range of distances r comprised between 25 and 45 % of the height H of the tyre, the variation in thickness (X) is less than or equal to - 0.25 mm / mm over at least 4 % of the height H of the tyre, and in which the annular reinforcing structure has a maximum axial width DE such that the ratio (Y), where E(r)max is the maximum value of the thickness E(r), is less than or equal to 10%.

Description

technical field [0001] The present invention relates to passenger vehicle tires having a load index above 100, such as most tires designed to be fitted to vehicles of the "4x4" type. Background technique [0002] The load index of a tire is a parameter well known to those skilled in the art. The load index quantifies the maximum load the tire can withstand when mounted on the mounting rim and inflated to operating pressure. A load index of 100 corresponds to a maximum load of 800 kg. [0003] Most passenger car tires include: [0004] - two beads, said two beads being designed to be in contact with the mounting rim, each bead comprising at least one annular reinforcing structure; [0005] - two sidewalls extending said bead radially outwards and meeting in a crown comprising a crown reinforcement covered by the tread; [0006] - at least one carcass reinforcement extending from the bead through the sidewalls to the crown, said carcass reinforcement comprising a plurality...

Claims

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Application Information

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IPC IPC(8): B60C15/04B60C15/06B60C15/00
CPCB60C15/06
Inventor F-X·布吕诺F·布儒瓦
Owner MICHELIN & CO CIE GEN DES ESTAB MICHELIN
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