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Tyre with improved beads

A bead and tire technology that is applied to tire components, bead edges, vehicle components, etc., and can solve the problem that the reduction in rolling resistance is no longer sufficient

Active Publication Date: 2011-11-23
MICHELIN & CO CIE GEN DES ESTAB MICHELIN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Consequently, the reduction in rolling resistance obtained with a tire according to document US 5 526 863 is no longer sufficient

Method used

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  • Tyre with improved beads
  • Tyre with improved beads

Examples

Experimental program
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Effect test

Embodiment Construction

[0047] When the term "radial" is used, it is important to distinguish among those skilled in the art several different uses of the term. First, the expression refers to the radius of the tire. In this sense, a point P1 is said to be "radially inside" a point P2 (or "radially inside" a point P2) if it is closer to the axis of rotation of the tire than a point P2. Conversely, a point P3 is said to be "radially outside" a point P4 (or "radially outside" a point P4) if it is farther from the axis of rotation of the tire than a point P4 is. This meaning of the term is also used when referring to radial distances. "Radially inwardly" means toward a smaller radius; "radially outwardly" means toward a larger radius.

[0048] However, a thread or reinforcement is said to be "radial" when the angle formed by the reinforcing elements of the thread or reinforcement with the circumferential direction is greater than or equal to 80° and less than or equal to 90°. It should be noted that ...

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PUM

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Abstract

Tyre comprising two beads (20), two sidewalls (30) joining in a crown, and at least one carcass reinforcement (60) extending from the beads through the sidewalls to the crown, the carcass reinforcement being anchored in the two beads by a turn-up around an annular reinforcing structure (70) in such a way as to form in each bead an incoming portion (61 ) and a wrapped-around portion (62), wherein each bead comprises a bead filler (1 10) and an outer band (120), the latter being placed axially outside of both the carcass reinforcement and the bead filler, wherein the outer band (120) is made of a rubber compound having an elastic modulus G' less than or equal to 15 MPa and a viscous modulus G" such that: G" [MPa] = 0.2G' [MPa] - 0.2 MPa, the elastic and viscous moduli being measured at 23 DEG C.

Description

technical field [0001] The present invention relates to tires for passenger vehicles and in particular to the beads of these tires. Background technique [0002] Tires for passenger vehicles typically include: [0003] two beads, said beads being designed to be in contact with the wheel rim, each bead comprising at least one annular reinforcing structure and a bead filler located radially on the outside of the annular reinforcing structure; [0004] two sidewalls extending the beads radially outwardly, the two sidewalls being joined in the crown; [0005] a crown comprising a crown reinforcement covered by a tread; [0006] At least one carcass reinforcement extending from the beads through the sidewalls to the crown and comprising a plurality of carcass reinforcing elements. The carcass reinforcement is generally anchored in the two beads by upturning around the annular reinforcing structure, forming a "lead-in" and a "turn-up" in each bead. The bead filler is located a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B60C15/06
CPCB60C15/06B60C15/0607B60C2015/009
Inventor B·达瓦尔
Owner MICHELIN & CO CIE GEN DES ESTAB MICHELIN
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